Publications

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Pdf version [last updated – January 30, 2024]

Books and book chapters:

2016

I. Prodan, F. Stoican, S. Olaru, and S. Niculescu, Mixed-integer representations in control design: Mathematical foundations and applications, , 2016.
[Bibtex]

@book{WOS:000415981400008,
author = {Prodan, Ionela and Stoican, Florin and Olaru, Sorin and Niculescu, Silviu-Iulian},
cites = {0},
citews = {0},
doi = {10.1007/978-3-319-26995-5},
eid = {2-s2.0-84994142931},
international = {1},
issn = {2191-8112},
isbn = {9783319269955; 9783319269931},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994142931&doi=10.1007%2f978-3-319-26995-5&partnerID=40&md5=4b068b7971107b52731e3c48f68eeefe},
pages = {1-115},
xdata={springer},
series = {SpringerBriefs in Control, Automation and Robotics},
title = {{M}ixed-integer representations in control design: {M}athematical foundations and applications},
worldcat = {0},
wos = {000415981400008},
year = {2016},
abstract = {Gives readers a unified treatment of mathematical features encountered in important engineering problems. Provides multiple illustrations of key mathematical constructions.
Details analysis of existing solutions and novel results for description of non-convex regions}
}

2013

F. Stoican and S. Olaru, Set-theoretic Fault-tolerant Control in Multisensor Systems, , 2013.
[Bibtex]

@book{WOS:000327043800009,
author = {Stoican, Florin and Olaru, Sorin},
cites = {0},
citews = {12},
doi = {10.1002/9781118649428},
eid = {2-s2.0-85014342801},
international = {1},
isbn = {9781848215658; 9781118649428},
issn = {-},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85014342801&partnerID=40&md5=3121552b7df07e1d93fa7621538ce049},
pages = {1-152},
xdata={wiley},
title = {{S}et-theoretic {F}ault-tolerant {C}ontrol in {M}ultisensor {S}ystems},
series={Automation - Control and Industrial Engineering Series},
worldcat = {1},
wos = {000327043800009},
year = {2013},
abstract = {Fault-tolerant control theory is a well-studied topic but the use of the sets in detection, isolation and/or reconfiguration is rather tangential.
The authors of this book propose a systematic analysis of the set-theoretic elements and devise approaches which exploit advanced elements within the field. The main idea is to translate fault detection and isolation conditions into those conditions involving sets. Furthermore, these are to be computed efficiently using positive invariance and reachability notions. Constraints imposed by exact fault control are used to define feasible references (which impose persistent excitation and, thus, non-convex feasible sets). Particular attention is given to the reciprocal influences between fault detection and isolation on the one hand, and control reconfiguration on the other.
Contents
1. State of the Art in Fault-tolerant Control
2. Fault Detection and Isolation in Multisensor Systems
3. Residual Generation and Reference Governor Design
4. Reconfiguration of the Control Mechanism for Fault-tolerant Control
5. Related Problems and Applications}
}

Journal papers:

2024

P. Irofti, L. Romero-Ben, F. Stoican, and V. Puig, “Learning dictionaries from physical-based interpolation for water network leak localization,” , pp. 1-12, 2024.
[Bibtex]

@article{WOS:001124011100001,
author={Irofti, Paul and Romero-Ben, Luis and Stoican, Florin and Puig, Vicenç},
xdata={tcst},
title={Learning Dictionaries From Physical-Based Interpolation for Water Network Leak Localization},
year={2024},
volume={},
number={},
pages={1-12},
doi={10.1109/TCST.2023.3329696},
wos={001124011100001},
abstract={This article presents a leak localization methodology based on state estimation and learning. The first is handled by an interpolation scheme, whereas dictionary learning (DL) is considered for the second stage. The novel proposed interpolation technique exploits the physics of the interconnections between hydraulic heads of neighboring nodes in water distribution networks (WDNs). In addition, residuals are directly interpolated instead of hydraulic head values. The results of applying the proposed method to a well-known case study (Modena) demonstrated the improvements of the new interpolation method with respect to a state-of-the-art approach, both in terms of interpolation error (considering state and residual estimation) and posterior localization.}
}

2023

D. Popescu, L. Ichim, and F. Stoican, “Orchard monitoring based on unmanned aerial vehicles and image processing by artificial neural networks: a systematic review,” , vol. 14, 2023.
[Bibtex]

@article{WOS:001118569700001,
title={Orchard monitoring based on unmanned aerial vehicles and image processing by artificial neural networks: a systematic review},
author={Popescu, Dan and Ichim, Loretta and Stoican, Florin},
volume={14},
year={2023},
xdata={fps},
doi={10.3389/fpls.2023.1237695},
wos={001118569700001},
abstract={Orchard monitoring is a vital direction of scientific research and practical application for increasing fruit production in ecological conditions. Recently, due to the development of technology and the decrease in equipment cost, the use of unmanned aerial vehicles and artificial intelligence algorithms for image acquisition and processing has achieved tremendous progress in orchards monitoring. This paper highlights the new research trends in orchard monitoring, emphasizing neural networks, unmanned aerial vehicles (UAVs), and various concrete applications. For this purpose, papers on complex topics obtained by combining keywords from the field addressed were selected and analyzed. In particular, the review considered papers on the interval 2017-2022 on the use of neural networks (as an important exponent of artificial intelligence in image processing and understanding) and UAVs in orchard monitoring and production evaluation applications. Due to their complexity, the characteristics of UAV trajectories and flights in the orchard area were highlighted. The structure and implementations of the latest neural network systems used in such applications, the databases, the software, and the obtained performances are systematically analyzed. To recommend some suggestions for researchers and end users, the use of the new concepts and their implementations were surveyed in concrete applications, such as a) identification and segmentation of orchards, trees, and crowns; b) detection of tree diseases, harmful insects, and pests; c) evaluation of fruit production, and d) evaluation of development conditions. To show the necessity of this review, in the end, a comparison is made with review articles with a related theme.}
}

2022

B. D. Ciubotaru, A. Sperila, S. Diaconescu, F. Stoican, A. M. Stoica, and S. Bennani, “Satellite micro-launcher control: an integrated adaptive-robust and nonlinear approach,” , vol. 122, 2022.
[Bibtex]

@article{WOS:000796711000008,
Author = {Ciubotaru, Bogdan D. and Sperila, Andrei and Diaconescu, Sabin and Stoican, Florin and Stoica, Adrian M. and Bennani, Samir},
Title = {Satellite micro-launcher control: An integrated adaptive-robust and nonlinear approach},
xdata={cep},
Year = {2022},
Volume = {122},
Month = may,
doi = {10.1016/j.conengprac.2022.105072},
wos = {000796711000008},
abstract={
In this paper, a composite and multi-technique-based controller for a three-stage micro-launcher is presented. The proposed control law consists in a linear robust component, obtained for the rigid motion using mixed-sensitivity and normalized coprime factor loopshaping, an adaptive command gain, used to compensate the effects of the flexible motion, and a nonlinear component, used for roll control and payload insertion. Moreover, robust stability is ensured in the presence of parametric uncertainty, while also guaranteeing a set of disk margins which accommodate the adaptive gain. Finally, robust performance is validated via structured singular value analysis at successive instants along the trajectory, while the control scheme is tested in simulation upon the micro-launcher's nonlinear and uncertain dynamics.}
}

2021

D. Ioan, I. Prodan, S. Olaru, F. Stoican, and S. Niculescu, “Mixed-integer programming in motion planning,” , vol. 51, pp. 65-87, 2021.
[Bibtex]

@article{WOS:000664938900006,
author = {Ioan, Daniel and Prodan, Ionela and Olaru, Sorin and Stoican, Florin and
Niculescu, Silviu-Iulian},
title = {{Mixed-integer programming in motion planning}},
xdata = {arc},
year = {2021},
volume = {51},
pages = {65-87},
doi = {10.1016/j.arcontrol.2020.10.008},
wos = {WOS:000664938900006},
abstract={This paper presents a review of past and present results and approaches in the area of motion planning using MIP (Mixed-integer Programming). Although in the early 2000s MIP was still seen with reluctance as method for solving motion planning-related problems, nowadays, due to increases in computational power and theoretical advances, its extensive modeling capabilities and versatility are coming to the fore and enjoy increased application and appreciation. This class of control problems involves, essentially, either a selection from a limited number of alternatives or a constrained optimization problem over a non-convex domain. In both situations, MIP has proven to be an efficient modeling technique as it will be shown in the present review paper. Furthermore, an emphasis is laid on the existing alternatives for implementation and on various experimental validations documented in the literature.}
}

2020

D. Popescu, F. Stoican, G. Stamatescu, L. Ichim, and C. Dragana, “Advanced UAV–WSN system for intelligent monitoring in precision agriculture,” , vol. 20, iss. 3, p. 817, 2020.
[Bibtex]

@article{WOS:000517786200241,
title={Advanced {UAV--WSN} System for Intelligent Monitoring in Precision Agriculture},
author={Popescu, Dan and Stoican, Florin and Stamatescu, Grigore and Ichim, Loretta and Dragana, Cristian},
xdata={sensors},
volume={20},
number={3},
pages={817},
year={2020},
doi={10.3390/s20030817},
wos={000517786200241},
abstract={The growing need for food worldwide requires the development of a high-performance, high-productivity, and sustainable agriculture, which implies the introduction of new technologies into monitoring activities related to control and decision-making. In this regard, this paper presents a hierarchical structure based on the collaboration between unmanned aerial vehicles (UAVs) and federated wireless sensor networks (WSNs) for crop monitoring in precision agriculture. The integration of UAVs with intelligent, ground WSNs, and IoT proved to be a robust and efficient solution for data collection, control, analysis, and decisions in such specialized applications. Key advantages lay in online data collection and relaying to a central monitoring point, while effectively managing network load and latency through optimized UAV trajectories and in situ data processing. Two important aspects of the collaboration were considered: designing the UAV trajectories for efficient data collection and implementing effective data processing algorithms (consensus and symbolic aggregate approximation) at the network level for the transmission of the relevant data. The experiments were carried out at a Romanian research institute where different crops and methods are developed. The results demonstrate that the collaborative UAV-WSN-IoT approach increases the performances in both precision agriculture and ecological agriculture.}
}

P. Irofti, F. Stoican, and V. Puig, “Fault handling in large water networks with online dictionary learning,” , vol. 94, pp. 46-57, 2020.
[Bibtex]

@article{WOS:000577483600005,
title={Fault Handling in Large Water Networks with Online Dictionary Learning},
author={Irofti, Paul and Stoican, Florin and Puig, Vicen{\c{c}}},
year={2020},
xdata={ijpc},
volume={94},
pages={46-57},
doi={10.1016/j.jprocont.2020.08.003},
wos={000577483600005},
abstract={Fault detection and isolation in water distribution networks is an active topic due to the nonlinearities of flow propagation and recent increases in data availability due to sensor deployment. Here, we propose an efficient two-step data driven alternative: first, we perform sensor placement taking the network topology into account; second, we use incoming sensor data to build a network model through online dictionary learning. Online learning is fast and allows tackling large networks as it processes small batches of signals at a time. This brings the benefit of continuous integration of new data into the existing network model, either in the beginning for training or in production when new data samples are gathered. The proposed algorithms show good performance in our simulations on both small and large-scale networks.}
}

2019

D. Popescu, F. Stoican, G. Stamatescu, O. Chenaru, and L. Ichim, “A survey of collaborative UAV-WSN systems for efficient monitoring,” , vol. 19, iss. 21, 2019.
[Bibtex]

@article{WOS:000498834000087,
author = {Popescu, Dan and Stoican, Florin and Stamatescu, Grigore and Chenaru, Oana and Ichim, Loretta},
title = {A Survey of Collaborative {UAV-WSN} Systems for Efficient Monitoring},
xdata={sensors},
year = {2019},
volume = {19},
number = {21},
month = nov,
type = {Review},
doi = {10.3390/s19214690},
wos = {000498834000087},
abstract={Integrated systems based on wireless sensor networks (WSNs) and unmanned aerial vehicles (UAVs) with electric propulsion are emerging as state-of-the-art solutions for large scale monitoring. Main advances stemming both from complex system architectures as well as powerful embedded computing and communication platforms, advanced sensing and networking protocols have been leveraged to prove the viability of this concept. The design of suitable algorithms for data processing, communication and control across previously disparate domains has thus currently become an intensive area of interdisciplinary research. The paper was focused on the collaborative aspects of UAV-WSN systems and the reference papers were analyzed from this point of view, on each functional module. The paper offers a timely review of recent advances in this area of critical interest with focus on a comparative perspective across multiple recent theoretical and applied contributions. A systematic approach is carried out in order to structure a unitary from conceptual design towards key implementation aspects. Focus areas are identified and discussed such as distributed data processing algorithms, hierarchical multi-protocol networking aspects and high level WSN-constrained UAV-control. Application references are highlighted in various domains such as environmental, agriculture, emergency situations and homeland security. Finally, a research agenda is outlined to advance the field towards tangible economic and social impact.}
}

D. Ioan, S. Olaru, I. Prodan, F. Stoican, and S. Niculescu, “From Obstacle-Based Space Partitioning to Corridors and Path Planning. A Convex Lifting Approach,” , vol. 4, iss. 1, p. 79–84, 2019.
[Bibtex]

@article{ioan2019obstacle,
title={{From Obstacle-Based Space Partitioning to Corridors and Path Planning. A Convex Lifting Approach}},
author={Ioan, Daniel and Olaru, Sorin and Prodan, Ionela and Stoican, Florin and Niculescu, Silviu-Iulian},
xdata={lcss},
volume={4},
number={1},
pages={79--84},
year={2019},
doi={10.1109/LCSYS.2019.2922414},
wos={000619281800014},
abstract={This letter proposes a novel methodology for path generation in known and congested multi-obstacle environments. Our aim is to solve an open problem in navigation within such environments: the feasible space partitioning in accordance with the distribution of obstacles. It is shown that such a partitioning is a key concept toward the generation of a corridor in cluttered environments. Once a corridor between an initial and a final position is generated, the selection of a path is considerably simplified in comparison with the methods which explore the original non-convex feasible regions of the environment. The core of the methodology presented here is the construction of a convex lifting which boils down to a convex optimization. This letter covers both the mathematical foundations and the computational details of the implementation and aims to illustrate the concepts with geometrical examples.}
}

F. Stoican and P. Irofti, “Aiding Dictionary Learning Through Multi-Parametric Sparse Representation,” , vol. 12, iss. 7, pp. 131-148, 2019.
[Bibtex]

@article{WOS:000478578100005,
title={{Aiding Dictionary Learning Through Multi-Parametric Sparse Representation}},
author={Stoican, Florin and Irofti, Paul},
volume={12},
number={7},
pages={131-148},
year={2019},
xdata={algorithms},
doi={10.3390/a12070131},
wos={000478578100005},
abstract={The l1 relaxations of the sparse and cosparse representation problems which appear in the dictionary learning procedure are usually solved repeatedly (varying only the parameter vector), thus making them well-suited to a multi-parametric interpretation. The associated constrained optimization problems differ only through an affine term from one iteration to the next (i.e., the problem's structure remains the same while only the current vector, which is to be (co)sparsely represented, changes). We exploit this fact by providing an explicit, piecewise affine with a polyhedral support, representation of the solution. Consequently, at runtime, the optimal solution (the (co)sparse representation) is obtained through a simple enumeration throughout the non-overlapping regions of the polyhedral partition and the application of an affine law. We show that, for a suitably large number of parameter instances, the explicit approach outperforms the classical implementation.}
}

2018

D. Popescu, C. Dragana, F. Stoican, L. Ichim, and G. Stamatescu, “A collaborative UAV-WSN network for monitoring large areas,” , pp. 1-25, 2018.
[Bibtex]

@article{WOS:000454817100121,
author = {Popescu, Dan and Dragana, Cristian and Stoican, Florin and Ichim, Loretta and Stamatescu, Grigore},
cites = {3},
citews = {2},
doi = {10.3390/s18124202},
eid = {2-s2.0-85058086560},
international = {1},
issue = {12},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85058086560&doi=10.3390%2fs18124202&partnerID=40&md5=8d66d90d51a804503284849b615f24b2},
pages = {1-25},
title = {{A} collaborative {UAV}-{WSN} network for monitoring large areas},
vol = {18},
xdata={sensors},
wos = {000454817100121},
year = {2018},
abstract={Large-scale monitoring systems have seen rapid development in recent years. Wireless sensor networks (WSN), composed of thousands of sensing, computing and communication nodes, form the backbone of such systems. Integration with unmanned aerial vehicles (UAVs) leads to increased monitoring area and to better overall performance. This paper presents a hybrid UAV-WSN network which is self-configured to improve the acquisition of environmental data across large areas. A prime objective and novelty of the heterogeneous multi-agent scheme proposed here is the optimal generation of reference trajectories, parameterized after inter- and intra-line distances. The main contribution is the trajectory design, optimized to avoid interdicted regions, to pass near predefined way-points, with guaranteed communication time, and to minimize total path length. Mixed-integer description is employed into the associated constrained optimization problem. The second novelty is the sensor localization and clustering method for optimal ground coverage taking into account the communication information between UAV and a subset of ground sensors (i.e., the cluster heads). Results show improvements in both network and data collection efficiency metrics by implementing the proposed algorithms. These are initially evaluated by means of simulation and then validated on a realistic WSN-UAV test-bed, thus bringing significant practical value.}
}

F. Stoican, I. Prodan, and E. I. Grotli, “Exact and overapproximated guarantees for corner cutting avoidance in a multiobstacle environment,” , pp. 4528-4548, 2018.
[Bibtex]

@article{WOS:000444416300014,
author = {Stoican, Florin and Prodan, Ionela and Grotli, Esten Ingar},
cites = {0},
citews = {0},
doi = {10.1002/rnc.4248},
eid = {2-s2.0-85050655361},
international = {1},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85050655361&doi=10.1002%2frnc.4248&partnerID=40&md5=9ccea56eabad8eeaa2d0e4b67f916f99},
pages = {4528-4548},
title = {Exact and overapproximated guarantees for corner cutting avoidance in a multiobstacle environment},
vol = {28},
worldcat = {0},
xdata={ijrnc},
wos = {000444416300014},
year = {2018},
abstract={The corner cutting avoidance problem is an important but often overlooked part of motion planning strategies. Obstacle and collision avoidance constraints are usually imposed at the sampling time without regards to the intrasample behavior of the agent. Hence, it is possible for an agent to cut the corner of an obstacle while apparently respecting the constraints. This paper improves upon state of the art by providing exact and overapproximated descriptions of the undershadow (and of its complement, the visible) region generated by an agent against obstacles. We employ a hyperplane arrangement construction to handle multiple obstacles simultaneously and provide piecewise descriptions of the regions of interest and parametrizations of the corner cutting conditions (useful, eg, in finite horizon optimization problems). Mixed-integer representations are used to describe the regions of interest, leading in the overapproximated case to binary-only constraints. Illustrative proofs of concept, comparisons with the state of the art, and simulations over a standard multiobstacle avoidance problem showcase the benefits of the proposed approach.}
}

2017

D. Popescu, L. Ichim, and F. Stoican, “Unmanned aerial vehicle systems for remote estimation of flooded areas based on complex image processing,” Sensors (Switzerland), pp. 1-24, 2017.
[Bibtex]

@article{WOS:000398818700019,
author = {Popescu, Dan and Ichim, Loretta and Stoican, Florin},
cites = {9},
citews = {7},
doi = {10.3390/s17030446},
eid = {2-s2.0-85014008000},
international = {1},
issue = {3},
journal = {{S}ensors ({S}witzerland)},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85014008000&doi=10.3390%2fs17030446&partnerID=40&md5=14d096de67dee764bd26b4cb4aaae010},
pages = {1-24},
xdata={sensors},
title = {{U}nmanned aerial vehicle systems for remote estimation of flooded areas based on complex image processing},
vol = {17},
worldcat = {0},
wos = {000398818700019},
year = {2017},
abstract={Floods are natural disasters which cause the most economic damage at the global level. Therefore, flood monitoring and damage estimation are very important for the population, authorities and insurance companies. The paper proposes an original solution, based on a hybrid network and complex image processing, to this problem. As first novelty, a multilevel system, with two components, terrestrial and aerial, was proposed and designed by the authors as support for image acquisition from a delimited region. The terrestrial component contains a Ground Control Station, as a coordinator at distance, which communicates via the internet with more Ground Data Terminals, as a fixed nodes network for data acquisition and communication. The aerial component contains mobile nodesfixed wing type UAVs. In order to evaluate flood damage, two tasks must be accomplished by the network: area coverage and image processing. The second novelty of the paper consists of texture analysis in a deep neural network, taking into account new criteria for feature selection and patch classification. Color and spatial information extracted from chromatic co-occurrence matrix and mass fractal dimension were used as well. Finally, the experimental results in a real mission demonstrate the validity of the proposed methodologies and the performances of the algorithms.}
}

2016

D. Popescu, F. Stoican, and L. Ichim, “Control and optimization of UAV trajectory for aerial coverage in photogrammetry applications,” , pp. 99-106, 2016.
[Bibtex]

@article{WOS:000384750000014,
author = {Popescu, Dan and Stoican, Florin and Ichim, Loretta},
cites = {3},
citews = {0},
doi = {10.4316/AECE.2016.03014},
eid = {2-s2.0-84991093546},
issue = {3},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991093546&doi=10.4316%2fAECE.2016.03014&partnerID=40&md5=96a34a0fc92385ca4ce11ffebd765dbb},
pages = {99-106},
title = {{C}ontrol and optimization of {UAV} trajectory for aerial coverage in photogrammetry applications},
vol = {16},
xdata={aece},
worldcat = {0},
wos = {000384750000014},
year = {2016},
abstract={Photogrammetry is a well-studied and much-used analysis tool. Typical use cases include area surveillance, flood monitoring and related tasks. Usually, an Unmanned Aerial System (UAS) is used as support for image acquisition from an a priori delimited region in a semi-automated manner (via a mix of ground control and autonomous trajectory tracking). This in turn has led to various algorithms which handle path trajectory generation under realistic constraints but still many avenues remain open. In this paper, we consider typical costs and constraints (UAS dynamics, total-path length, line inter-distance, turn points, etc.) in order to obtain, via optimization procedures, an optimal trajectory. To this end we make use of polyhedral set operations, flat trajectory generation and other similar tools. Additional work includes the study of non-convex regions and estimation of the number of photographs taken via Ehrhart polynomial computations.}
}

N. Stankovic, F. Stoican, S. Olaru, and S. Niculescu, “Fault tolerant control design for a class of multi-sensor networked control systems,” , pp. 412-426, 2016.
[Bibtex]

@article{WOS:000369342100016,
author = {Stankovic, Nikola and Stoican, Florin and Olaru, Sorin and Niculescu, Silviu-Iulian},
cites = {3},
citews = {3},
doi = {10.1002/acs.2568},
eid = {2-s2.0-84961367930},
international = {1},
issue = {2},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961367930&doi=10.1002%2facs.2568&partnerID=40&md5=3cdbd118216be4cc5ad041872cd69803},
pages = {412-426},
title = {{F}ault tolerant control design for a class of multi-sensor networked control systems},
vol = {30},
worldcat = {0},
xdata={ijacasp},
wos = {000369342100016},
year = {2016},
abstract={In this paper, we consider a multi-sensor networked control configuration with linear plant which is affected by a bounded additive disturbance. Shared network is used for the communication between sensors and controller. It is assumed that the sensors are prone to abrupt faults, while the controller's input may be updated with a varying time-delay. In order to identify and isolate the sensor(s) providing faulty information, we equip the controller with a set-based detection and isolation routine. Furthermore, in the case when the network induces time-delays, control is performed based on the knowledge we have on the mathematical model of the plant. In the presence of model inaccuracies or disturbance, such a control action may not guarantee satisfying performance of the system. Therefore, a stabilising controller with delay compensation has been designed. The functioning of the proposed control algorithm has been illustrated through an example.}
}

2015

F. Xu, V. Puig, C. Ocampo-Martinez, S. Olaru, and F. Stoican, “Set-theoretic methods in robust detection and isolation of sensor faults,” , pp. 2317-2334, 2015.
[Bibtex]

@article{WOS:000357935900003,
author = {Xu, Feng and Puig, Vicenc and Ocampo-Martinez, Carlos and Olaru, Sorin and Stoican, Florin},
cites = {28},
citews = {18},
doi = {10.1080/00207721.2014.989293},
eid = {2-s2.0-84946481041},
international = {1},
issue = {13},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946481041&doi=10.1080%2f00207721.2014.989293&partnerID=40&md5=b14a3c11df2c7a8bd9aec8d13fdfe3d3},
pages = {2317-2334},
title = {{S}et-theoretic methods in robust detection and isolation of sensor faults},
vol = {46},
worldcat = {0},
xdata={ijss},
wos = {000357935900003},
year = {2015},
abstract={This paper proposes a sensorfault detection and isolation (FDI) approach based on interval observers and invariant sets. In fault detection (FD), both interval observer-based and invariant set-based mechanisms are used to provide real-time fault alarms. In fault isolation (FI), the proposed approach also uses these two different mechanisms. The former, based on interval observers, aims to isolate faults during the transient-state operation induced by faults. If the former does not succeed, the latter, based on both interval observers and invariant sets, is started to guarantee FI after the system enters into steady state. Besides, a collection of invariant set-based FDI conditions are established by using all available system-operating information provided by all interval observers. In order to reduce computational complexity, a method to remove all available but redundant/unnecessary system-operating information is incorporated into this approach. If the considered faults satisfy the proposed FDI conditions, it can be guaranteed that they are detectable and isolable after their occurrences. This paper concludes with a case study based on a subsystem of a wind turbine benchmark, which can illustrate the effectiveness of this FDI technique.}
}

I. Prodan, E. Zio, and F. Stoican, “Fault tolerant predictive control design for reliable microgrid energy management under uncertainties,” Energy, pp. 20-34, 2015.
[Bibtex]

@article{WOS:000365362700003,
author = {Prodan, Ionela and Zio, Enrico and Stoican, Florin},
cites = {17},
citews = {15},
doi = {10.1016/j.energy.2015.08.009},
eid = {2-s2.0-84946026960},
international = {1},
issue = {},
journal = {{E}nergy},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946026960&doi=10.1016%2fj.energy.2015.08.009&partnerID=40&md5=6ce5f72e2318d3c6691bbe9576813238},
pages = {20-34},
title = {{F}ault tolerant predictive control design for reliable microgrid energy management under uncertainties},
vol = {91},
xdata={energy},
worldcat = {0},
wos = {000365362700003},
year = {2015},
abstract={This paper presents an extension of a MPC (Model Predictive Control) approach for microgrid energy management which takes into account electricity costs, power consumption, generation profiles, power and energy constraints as well as uncertainty due to variations in the environment. The approach is based on a coherent framework of control tools, like mixed-integer programming and soft constrained MPC, for describing the microgrid components dynamics and the overall system control architecture. Fault tolerant strategies are inserted in order to ensure the proper amount of energy in the storage devices such that (together with the utility grid) the essential consumer demand is always covered. Simulation results on a particular microgrid architecture validate the proposed approach.}
}

2014

F. Stoican, S. Olaru, M. M. Seron, and J. A. De Dona, “A fault tolerant control scheme based on sensor-actuation channel switching and dwell time,” , pp. 775-792, 2014.
[Bibtex]

@article{WOS:000329740800010,
author = {Stoican, Florin and Olaru, Sorin and Seron, Maria M. and De Dona, Jose A.},
cites = {9},
citews = {7},
doi = {10.1002/rnc.2907},
eid = {2-s2.0-84892555102},
international = {1},
% issue = {4},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84892555102&doi=10.1002%2frnc.2907&partnerID=40&md5=f4b2aa9933b23ff35d65f7e9e7cd8708},
pages = {775-792},
title = {{A} fault tolerant control scheme based on sensor-actuation channel switching and dwell time},
vol = {24},
xdata={ijrnc},
worldcat = {0},
wos = {000329740800010},
year = {2014},
abstract = {The present paper proposes a switching control scheme for a plant with multiple sensor-estimator/control-actuator pairs. The scheme is shown to handle the specific stability problems originated by the switching between the different feedback loops and accommodate to faults in the measurement (sensors) channels. The main contribution is a fault tolerant switching scheme with stability guarantees assured by a pre-imposed dwell time. The detection and the fault tolerance capabilities are achieved through the separation of sets associated with suitable residual signals corresponding to healthy and faulty functioning. Another contribution of the paper resides in a recovery technique for the post-fault reintegration of the biased estimations. This technique makes use of a virtual sensor whose associated estimation, based on an optimization procedure, minimizes the recovery time.}
}

F. Stoican, S. Olaru, J. A. De Dona, and M. M. Seron, “A discussion on sensor recovery techniques for fault tolerant multisensor schemes,” , pp. 1708-1722, 2014.
[Bibtex]

@article{WOS:000337363600009,
author = {Stoican, Florin and Olaru, Sorin and De Dona, Jose A. and Seron, Maria M.},
cites = {0},
citews = {0},
doi = {10.1080/00207721.2012.748947},
eid = {2-s2.0-84902884804},
international = {1},
issue = {8},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902884804&doi=10.1080%2f00207721.2012.748947&partnerID=40&md5=7285ca2f2970d86b13852996c7269a9f},
pages = {1708-1722},
title = {{A} discussion on sensor recovery techniques for fault tolerant multisensor schemes},
vol = {45},
worldcat = {0},
xdata={ijss},
wos = {000337363600009},
year = {2014},
abstract = {The present paper deals with the interplay between healthy and faulty sensor functioning in a multisensor scheme based on a switching control strategy. Fault tolerance guarantees have been recently obtained in this framework based upon the characterisation of invariant sets for state estimations in healthy and faulty functioning. A source of conservativeness of this approach is related to the issue of sensor recovery. A common working hypothesis has been to assume that once a sensor switches to faulty functioning it can no longer be used by the control mechanism even if at an ulterior moment it switches back to healthy functioning. In the current paper, we present necessary and sufficient conditions for the acknowledgement of sensor recovery and we propose and compare different techniques for the reintegration of sensors in the closed-loop decision-making mechanism.}
}

F. Xu, V. Puig, C. Ocampo-Martinez, F. Stoican, and S. Olaru, “Actuator-fault detection and isolation based on set-theoretic approaches,” , pp. 947-956, 2014.
[Bibtex]

@article{WOS:000338806000023,
author = {Xu, Feng and Puig, Vicenc and Ocampo-Martinez, Carlos and Stoican, Florin and Olaru, Sorin},
cites = {19},
citews = {17},
doi = {10.1016/j.jprocont.2014.04.016},
eid = {2-s2.0-84903317323},
international = {1},
issue = {6},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903317323&doi=10.1016%2fj.jprocont.2014.04.016&partnerID=40&md5=4d6b41a08ec3f36ab9d9632579b0f725},
pages = {947-956},
title = {{A}ctuator-fault detection and isolation based on set-theoretic approaches},
vol = {24},
worldcat = {0},
xdata={ijpc},
wos = {000338806000023},
year = {2014},
abstract = {In this paper, an actuator-fault detection and isolation (FDI) approach is proposed. The FDI approach is based on a bank of interval observers, each of which is designed to match a healthy or faulty system mode. To ensure reliable FDI for all considered actuator faults, a collection of invariant set-based FDI conditions are established for the proposed technique. Under these guaranteed FDI conditions, all the considered faults can be detected and isolated during the transition induced by fault occurrences. Comparing with the existing set-based FDI approaches, the advantage of the proposed technique consists in that it combines the advantages of interval observers in the transient-state functioning and the advantages of invariant sets in the steady-state functioning. This paper is completed with the study of a continuous stirred-tank reactor (CSTR), which illustrates the effectiveness of the proposed method. }
}

M. Hovd and F. Stoican, “On the design of exact penalty functions for MPC using mixed integer programming,” , pp. 104-113, 2014.
[Bibtex]

@article{WOS:000342461300010,
author = {Hovd, Morten and Stoican, Florin},
cites = {7},
citews = {6},
doi = {10.1016/j.compchemeng.2013.07.001},
eid = {2-s2.0-84907099758},
international = {1},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907099758&doi=10.1016%2fj.compchemeng.2013.07.001&partnerID=40&md5=c2d6749d9e37a9f40234369c97285e6c},
pages = {104-113},
title = {{O}n the design of exact penalty functions for {MPC} using mixed integer programming},
vol = {70},
xdata={cace},
worldcat = {0},
wos = {000342461300010},
year = {2014},
abstract = {Soft constraints and penalty functions are commonly used in MPC to ensure that the optimization problem has a feasible solution, and thereby avoid MPC controller failure. On the other hand, soft constraints may allow for unnecessary violations of the original constraints, i.e., the constraints may be violated even if a valid solution that does not violate any constraints exists.
The paper develops procedures for the minimizing (according to some norm) of the Lagrange multipliers associated with a given mp-QP problem, assumed to originate from an MPC problem formulation. To this end the LICQ condition is exploited in order to efficiently formulate the optimization problem, and thereby improve upon existing mixed integer formulations and enhance the tractability of the problem. The results are used to design penalty functions such that corresponding soft constraints are made exact, that is, the original (hard) constraints are violated only if there exists no solution where all constraints are satisfied. }
}

2013

F. Stoican, S. Olaru, and G. Bitsoris, “Controlled invariance-based fault detection for multisensory control systems,” , pp. 606-611, 2013.
[Bibtex]

@article{WOS:000321714000012,
author = {Stoican, Florin and Olaru, Sorin and Bitsoris, George},
cites = {6},
citews = {5},
doi = {10.1049/iet-cta.2011.0678},
eid = {2-s2.0-84879490832},
international = {1},
issue = {4},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879490832&doi=10.1049%2fiet-cta.2011.0678&partnerID=40&md5=b3525cbfd98950c6e12c3a214dad1c08},
pages = {606-611},
title = {{C}ontrolled invariance-based fault detection for multisensory control systems},
xdata={iet-cta},
vol = {7},
worldcat = {0},
wos = {000321714000012},
year = {2013},
abstract = {In this study, set theoretic methods are used to design a fault-tolerant scheme for a multisensor control application. The basic principle is the separation of the invariant sets for the estimations of the state and tracking error under healthy and faulty functioning. The fault scenario assumes abrupt changes of the observation equations. The main contribution of this paper is the introduction of controlled invariant sets in the fault detection mechanism. The control action is chosen in order to guarantee the closed-loop positive invariance of a candidate region when the exogenous signals (additive disturbances, noise and reference/set-points) are bounded.}
}

2012

F. Stoican, S. Olaru, M. M. Seron, and J. A. De Dona, “Reference governor design for tracking problems with fault detection guarantees,” , pp. 829-836, 2012.
[Bibtex]

@article{WOS:000305670600001,
author = {Stoican, Florin and Olaru, Sorin and Seron, Maria M. and De Dona, Jose A.},
cites = {22},
citews = {18},
doi = {10.1016/j.jprocont.2012.02.004},
eid = {2-s2.0-84861603636},
international = {1},
% issue = {5},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84861603636&doi=10.1016%2fj.jprocont.2012.02.004&partnerID=40&md5=82563a85846cb3b94c0f3ded79cfc245},
pages = {829-836},
xdata={ijpc},
title = {{R}eference governor design for tracking problems with fault detection guarantees},
vol = {22},
worldcat = {0},
wos = {000305670600001},
year = {2012},
abstract = {The present paper deals with the reference tracking problem for processes with linear dynamics and multisensor information subject to abrupt sensor faults. A key point for fault tolerance will be the separation between healthy and faulty closed-loop behavior upon a set-characterization approach. This is achieved through set theoretic operations involving the healthy/faulty behavior of residual signals related to the system dynamics. As a main contribution, a reference governor scheme is designed using a receding horizon technique. It is shown that fault detection guarantees can be achieved by appropriate adjusting of the governor's delay/prediction window under mild assumptions on the fault scenario.}
}

I. Prodan, F. Stoican, S. Olaru, and S. Niculescu, “Enhancements on the Hyperplanes Arrangements in Mixed-Integer Programming Techniques,” , pp. 549-572, 2012.
[Bibtex]

@article{WOS:000306288300012,
author = {Prodan, Ionela and Stoican, Florin and Olaru, Sorin and Niculescu, Silviu-Iulian},
cites = {17},
citews = {14},
doi = {10.1007/s10957-012-0022-9},
eid = {2-s2.0-84864287100},
international = {1},
issue = {2},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84864287100&doi=10.1007%2fs10957-012-0022-9&partnerID=40&md5=1ad7913f22aa082da77b88f461b0a063},
pages = {549-572},
xdata={jota},
title = {{E}nhancements on the {H}yperplanes {A}rrangements in {M}ixed-{I}nteger {P}rogramming {T}echniques},
vol = {154},
worldcat = {0},
wos = {000306288300012},
year = {2012},
abstract = {This paper is concerned with improvements in constraints handling for mixed-integer optimization problems. The novel element is the reduction of the number of binary variables used for expressing the complement of a convex (polytopic) region. As a generalization, the problem of representing the complement of a possibly not connected union of such convex sets is detailed. In order to illustrate the benefits of the proposed improvements, a typical control application, the control of multiagent systems using receding horizon optimization techniques, is considered.}
}

2010

S. Olaru, J. A. De Dona, M. M. Seron, and F. Stoican, “Positive invariant sets for fault tolerant multisensor control schemes,” , pp. 2622-2640, 2010.
[Bibtex]

@article{WOS:000285354700018,
author = {Olaru, S. and De Dona, J. A. and Seron, M. M. and Stoican, F.},
cites = {71},
citews = {56},
doi = {10.1080/00207179.2010.535215},
eid = {2-s2.0-78650359008},
international = {1},
issue = {12},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-78650359008&doi=10.1080%2f00207179.2010.535215&partnerID=40&md5=e4a03b4f0444ab378514742fe775594d},
pages = {2622-2640},
title = {{P}ositive invariant sets for fault tolerant multisensor control schemes},
vol = {83},
worldcat = {0},
xdata={ijc},
wos = {000285354700018},
year = {2010},
abstract = {This article deals with fault tolerant multisensor control schemes for systems with linear dynamics. Positive invariance is a common analysis and control design tool for systems affected by bounded constraints and disturbances. This article revisits the construction of epsilon-approximations of minimal robust positive invariant sets for linear systems upon contractive set-iterations. The cases of switching between different sets of disturbances and the inclusion of a predefined region of the state space are treated in detail. All these results are used in multisensor control schemes which have to deal with specific problems originated by the switching between different estimators and by the presence of faults in some of the sensors. The construction of positive invariant sets for different operating regimes provides, in this context, effective fault detection information. Within the same framework, global stability of the switching strategies can be assured if the invariant sets topology allows the exclusive selection of estimates obtained from healthy sensors.}
}

Conference proceedings:

2023

B. Gheorghe, F. Stoican, and I. Prodan, “On complexity reduction in a variable terminal set setpoint-tracking mpc scheme,” in 62nd ieee conference on decision and control (cdc), 2023, pp. 5682-5687.
[Bibtex]

@inproceedings{10384014,
author={Gheorghe, Bogdan and Stoican, Florin and Prodan, Ionela},
booktitle={62nd IEEE Conference on Decision and Control (CDC)},
title={On Complexity Reduction in a Variable Terminal Set Setpoint-Tracking MPC Scheme},
year={2023},
volume={},
number={},
pages={5682-5687},
keywords={Encoding;Computational efficiency;Complexity theory;Predictive control;Testing;Model Predictive Control (MPC);Variable Terminal Set;Set inclusion;Zonotopic sets},
doi={10.1109/CDC49753.2023.10384014},
abstract ={We applied and adapted the linear encodings from [1] to the feasible-reference tracking model predictive control (MPC) formulation from [2] to reduce its computational cost. The improvements come from avoiding to explicitly use the vertex-based representation of the variable terminal set in testing its inclusion in the constraint set. We considered both polytopic and zonotopic formulations. For the later we have also proposed a positive invariant (PI) zonotopic approximation of the maximal PI set.}
}

B. Gheorghe, F. Stoican, and I. Prodan, “A variable terminal set NMPC construction: application to multicopter stabilisation,” in The 2023 european control conference, bucharest, romania, jun 13-16, 2023, pp. 1-6.
[Bibtex]

@inproceedings{WOS:001035589000112,
Author = {Gheorghe, Bogdan and Stoican, Florin and Prodan, Ionela},
Title = {A variable terminal set {NMPC} construction: application to multicopter stabilisation},
Booktitle = {The 2023 European Control Conference, Bucharest, Romania, Jun 13-16},
Year = {2023},
pages={1-6},
doi={10.23919/ECC57647.2023.10178227},
wos={001035589000112},
abstract={In this paper we relax the standard NMPC (Nonlinear Model Predictive Control) through a variable terminal set construction for stabilizing a multicopter system. This contribution allows us to increase the feasible domain and/or reduce the required prediction horizon length. Furthermore, to reduce the complexity of the computations we use zonotopic sets which prove instrumental due to their efficient representation. The theoretical results are validated in simulation and experiment for the stabilisation along a trajectory of a nano-multicopter's translational dynamics.}
}

V. Marguet, F. Stoican, and I. Prodan, “On the application of the Schoenberg quasi-interpolant for complexity reduction in trajectory generation,” in The 2023 european control conference, bucharest, romania, jun 13-16, 2023, pp. 1-6.
[Bibtex]

@inproceedings{WOS:001035589000060,
Author = {Marguet, Vincent and Stoican, Florin and Prodan, Ionela},
Title = {On the application of the {Schoenberg} quasi-interpolant for complexity reduction in trajectory generation},
Booktitle = {The 2023 European Control Conference, Bucharest, Romania, Jun 13-16},
pages={1-6},
Year = {2023},
doi = {10.23919/ECC57647.2023.10178175},
wos = {001035589000060},
abstract={The paper extends previous work on trajectory generation for UAV (Unmanned Aerial Vehicles) using B-spline curves to parameterize an associated flat output. Typical constraints and costs (such as those involving input bounds and trajectory length) lead to nonlinear formulations in terms of the control points weighting the B-spline curve. This complexity adversely affects the computation time and conservatism of the result. To mitigate these effects we use the Schoenberg operator to provide a quasi-interpolant of the original nonlinear functions. These improvements come at the price of an approximation error which requires a tightening of the original constraints (either from a theoretical bound or via an iterative procedure). The obtained results are exemplified over a fixed wing UAV model and they can be applied for any optimization-based trajectory planning problem.}
}

S. S. Mihai, F. Stoican, and B. D. Ciubotaru, “Computing the explicit MPC solution using the hasse diagram of the lifted feasible domain,” in The 2023 european control conference, bucharest, romania, jun 13-16, 2023, pp. 1-6.
[Bibtex]

@inproceedings{WOS:001035589000037,
Author = {Mihai, Stefan S. and Stoican, Florin and Ciubotaru, Bogdan D.},
Title = {Computing the explicit {MPC} solution using the Hasse diagram of the
lifted feasible domain},
Booktitle = {The 2023 European Control Conference, Bucharest, Romania, Jun 13-16},
pages={1-6},
Year = {2023},
doi={10.23919/ECC57647.2023.10178152},
wos = {001035589000037},
abstract={
This paper provides a combinatorial interpretation for the explicit solution of the quadratic cost, linear-constrained MPC (model predictive control) problem. We link the Hasse diagram of the lifted feasible domain with the critical regions which partition the parameter space and serve as polyhedral support for the piecewise affine explicit MPC solution.},
}

T. Nicu, F. Stoican, and I. Prodan, “Smooth approximation of polyhedral potential field in NMPC for obstacle avoidance,” in The 2023 european control conference, bucharest, romania, jun 13-16, 2023, pp. 1-6.
[Bibtex]

@inproceedings{WOS:001035589000295,
Author = {Nicu, Theodor-Gabriel and Stoican, Florin and Prodan, Ionela},
Title = {Smooth approximation of polyhedral potential field in {NMPC} for obstacle avoidance},
Booktitle = {The 2023 European Control Conference, Bucharest, Romania, Jun 13-16},
pages={1-6},
Year = {2023},
doi={10.23919/ECC57647.2023.10178410},
wos = {001035589000295},
abstract={
The sum function notion allows one to define a continuous, piecewise affine over a polyhedral support, surface which accurately penalizes the closeness to polyhedral obstacles. This, in turn, leads to a continuous and piecewise description of the potential field surface further used into an NMPC (Nonlinear Model Predictive Control) motion planning problem.
We introduce and analyze their smooth versions to show significant computational speedup. We analyze the links between the piecewise and smooth surfaces (magnitude and location of critical points). The results are validated in simulation and shown to compare favourably with previous mixed-integer based formulations.}
}

F. Stoican, J. Culita, and S. Olaru, “Set-theoretic fault-diagnosis for a nonlinear real-word fluidic benchmark,” in The 2023 european control conference, bucharest, romania, jun 13-16, 2023, pp. 1-6.
[Bibtex]

@inproceedings{WOS:001035589000032,
Author = {Stoican, Florin and Culita, Janetta and Olaru, Sorin},
Title = {Set-theoretic fault-diagnosis for a nonlinear real-word fluidic
benchmark},
Booktitle = {The 2023 European Control Conference, Bucharest, Romania, Jun 13-16},
pages={1-6},
Year = {2023},
doi={10.23919/ECC57647.2023.10178147},
wos = {001035589000032},
abstract={
Fault diagnosis is essential in managing abnormal changes in system characteristics which affect its functioning and control abilities. The manuscript provides a set-based fault diagnosis for a fluidic benchmark. Invariant sets are employed to characterize the steady-state behavior of the open-loop stable dynamics for sensor faults. It is shown that the set-based fault diagnosis theory integrates this model and is able to handle efficiently persistent fault events.}
}

2022

P. Irofti, L. Romero-Ben, F. Stoican, and V. Puig, “Data-driven leak localization in water distribution networks via dictionary learning and graph-based interpolation,” in 2022 ieee conference on control technology and applications (ccta), 2022, pp. 1265-1270.
[Bibtex]

@INPROCEEDINGS{9966160,
author={Irofti, Paul and Romero-Ben, Luis and Stoican, Florin and Puig, Vicenç},
booktitle={2022 IEEE Conference on Control Technology and Applications (CCTA)},
title={Data-driven Leak Localization in Water Distribution Networks via Dictionary Learning and Graph-based Interpolation},
year={2022},
volume={},
number={},
pages={1265-1270},
doi={10.1109/CCTA49430.2022.9966160}
}

H. T. Do, F. Nicolau, F. Stoican, and I. Prodan, “Tracking control for a flat system under disturbances: a fixed-wing UAV example,” in 18th ifac workshop on control applications of optimization (cao), gif sur yvette, france, jul 18-22, 2022, pp. 406-411.
[Bibtex]

@inproceedings{WOS:000855235100067,
Author = {Huu Thinh Do and Nicolau, Florentina and Stoican, Florin and Prodan, Ionela},
Title = {Tracking control for a flat system under disturbances: a fixed-wing {UAV} example},
Booktitle ={18th IFAC Workshop on Control Applications of Optimization (CAO), Gif sur Yvette, FRANCE, Jul 18-22},
Year = {2022},
Pages = {406-411},
doi = {10.1016/j.ifacol.2022.09.058},
wos = {000855235100067},
abstract={This paper considers a class of systems admitting several flat representations and proposes a trajectory tracking controller design which accounts for disturbance rejection. Set invariance is used for characterizing the tracking and estimation error dynamics. Furthermore, some insights on the disturbance propagation in case of different flat representations for a fixedwing Unmanned Aerial Vehicle (UAV) system are highlighted via simulations and comparisons.}
}

S. S. Mihai, F. Stoican, and B. D. Ciubotaru, “On the link between explicit MPC and the face lattice of the lifted feasible domain,” in 18th ifac workshop on control applications of optimization (cao), gif sur yvette, france, jul 18-22, 2022, pp. 308-313.
[Bibtex]

@inproceedings{WOS:000855235100052,
Author = {Mihai, Stefan S. and Stoican, Florin and Ciubotaru, Bogdan D.},
Title = {On the link between explicit {MPC} and the face lattice of the lifted feasible domain},
Year = {2022},
Pages = {308-313},
Booktitle ={18th IFAC Workshop on Control Applications of Optimization (CAO), Gif sur Yvette, FRANCE, Jul 18-22},
doi = {10.1016/j.ifacol.2022.09.042},
wos = {000855235100052},
abstract={The paper provides a geometric interpretation for the explicit solution of the quadratic cost, linear-constrained MPC (model predictive control) problem. We link the face lattice of the lifted feasible domain (defined in the input and parameter space) with the critical regions which partition the parameter space and serve as polyhedral support for the piecewise affine explicit MPC solution. We provide geometric (face visibility) and algebraic (polyhedron emptiness) tests for the pruning of the candidate sets of active constraints.}
}

T. Nicu, F. Stoican, and I. Prodan, “Polyhedral potential field constructions for obstacle avoidance in a receding horizon formulation,” in 18th ifac workshop on control applications of optimization (cao), gif sur yvette, france, jul 18-22, 2022, pp. 254-259.
[Bibtex]

@inproceedings{WOS:000855235100043,
Author = {Nicu, Theodor-Gabriel and Stoican, Florin and Prodan, Ionela},
Title = {Polyhedral potential field constructions for obstacle avoidance in a receding horizon formulation},
Year = {2022},
Pages = {254-259},
Booktitle ={18th IFAC Workshop on Control Applications of Optimization (CAO), Gif sur Yvette, FRANCE, Jul 18-22},
doi = {10.1016/j.ifacol.2022.09.033},
wos = {WOS:000855235100043},
abstract={We revisit and enhance previous work pertaining to the use of polyhedral potential fields for motion planning in a receding horizon framework. We adapt the standard vertex-based mixed-integer (MI) representations of piecewise affine functions and propose three equivalent formulations which balance the complexity of the geometric representation with the size of the associated MI representation. In all cases, we arrive at formulations whose polyhedral support comes (either directly or as a refinement of it) from an associated hyperplane arrangement induced by the hyperplanes bounding the polyhedral obstacles.}
}

A. G. Florea, F. Stoican, C. Buiu, and C. Oara, “3d pose estimation of custom objects using synthetic datasets,” in 26th international conference on system theory, control and computing (icstcc), sinaia, romania, oct 19-21, 2022, pp. 649-655.
[Bibtex]

@inproceedings{WOS:000889980600109,
Author = {Florea, Andrei G. and Stoican, Florin and Buiu, Calalin and Oara,
Cristian},
Title = {3D Pose Estimation of Custom Objects Using Synthetic Datasets},
Booktitle = {26th International Conference on System Theory, Control and Computing (ICSTCC), Sinaia, Romania, Oct 19-21},
Year = {2022},
Pages = {649-655},
doi = {10.1109/ICSTCC55426.2022.9931890},
wos = {000889980600109},
abstract={3D/6D pose estimation is a novel research area, part of the larger robotics sensing domain, focused on extracting 3D position and 3D rotation information using affordable hardware such as RGB-D or Stereoscopic depth cameras. Most estimators rely internally on a machine learning model for either the object detection phase or the entire 6D pose estimation loop. Thus, a custom machine learning (ML) model and dataset must be constructed and trained respectively in order to achieve the stated goal. The majority of the 3D/6D pose estimation models focus on standardized datasets so a custom dataset must also be created for each model. This article explores the benefits and challenges of artificially generated datasets on one 3D pose estimation model and the ML model transfer learning process. An accuracy test is conducted using real hardware.}
}

F. Stoican, T. Nicu, and I. Prodan, “A mixed-integer MPC with polyhedral potential field cost for obstacle avoidance,” in American control conference (acc), atlanta, ga, jun 08-10, 2022, pp. 2039-2044.
[Bibtex]

@inproceedings{WOS:000865458701147,
Author = {Stoican, Florin and Nicu, Theodor-Gabriel and Prodan, Ionela},
Title = {A mixed-integer {MPC} with polyhedral potential field cost for obstacle avoidance},
Booktitle = {American Control Conference (ACC), Atlanta, GA, Jun 08-10},
Year = {2022},
Pages = {2039-2044},
doi={10.23919/ACC53348.2022.9867148},
wos = {000865458701147},
abstract={This work pertains to the use of polyhedral potential fields which take into account the obstacles' shape through their associated sum function. As contributions, we extend the polyhedral sum function notion to the multi-obstacle case and show that the polyhedral support of its piecewise affine representation comes from an associated hyperplane arrangement. We exploit the obtained combinatorial structure to provide equivalent mixed-integer representations and model a repulsive potential term for subsequent use in a Model Predictive Control (MPC) formulation. The advantages are related to a decrease in the computational complexity and a coherent description of the repulsive potential, regardless of the cluttered environment's complexity.}
}

2021

H. Do, I. Prodan, and F. Stoican, “Analysis of alternative flat representations of a uav for trajectory generation and tracking,” in 25th international conference on system theory, control and computing (icstcc), iasi, romania, oct 20-23, 2021, pp. 58-63.
[Bibtex]

@inproceedings{WOS:000859487900010,
Author = {Do, Huu-Thinh and Prodan, Ionela and Stoican, Florin},
Editor = {Ferariu, L and Matcovschi, MH and Ungureanu, F},
Title = {Analysis of alternative flat representations of a UAV for trajectory generation and tracking},
Booktitle = {25th International Conference on System Theory, Control and Computing (ICSTCC), Iasi, Romania, Oct 20-23},
Year = {2021},
Pages = {58-63},
doi = {10.1109/ICSTCC52150.2021.9607073},
wos = {000859487900010},
abstract={Motion planning problems benefit greatly from the properties of differential flatness, which are widely employed for trajectory generation and controller design. This paper aims to highlight the fact that various flat representations of a system can have different implications in the trajectory generation and tracking objectives. In particular, we consider a fixed-wing UAV (Unmanned Aerial Vehicle) and analyze various flat representations. We reformulate the trajectory generation and tracking problem in terms of different flat outputs and analyze the optimal cost, constraints satisfaction, tracking error and computational complexity. Insights on the future work complete the analysis. The research shows promising directions, especially in the area of disturbance rejection and robust control.}
}

F. Stoican, S. S. Mihai, and B. D. Ciubotaru, “Observations on the complexity of the explicit mpc,” in 60th ieee conference on decision and control (cdc), dec 13-17, 2021, pp. 2551-2556.
[Bibtex]

@inproceedings{WOS:000781990302049,
Author = {Stoican, Florin and Mihai, Stefan S. and Ciubotaru, Bogdan D.},
Title = {Observations on the complexity of the explicit MPC},
Booktitle = {60th IEEE Conference on Decision and Control (CDC), Dec
13-17},
Year = {2021},
Pages = {2551-2556},
doi = {10.1109/CDC45484.2021.9683256},
wos = {000781990302049},
abstract={This paper analyzes the structure of the con- strained optimization problem induced by a typical Model Predictive Control (MPC) problem. The main idea is to exploit the particularities of the feasible domain (namely, that input/state/output constraints describe in fact zonotopic sets) to: i) efficiently describe the solution as a piecewise affine function with polyhedral support; ii) exploit the combinatorial properties of zonotopes to reduce the number of candidate active sets. The results are tested over a numerical example.}
}

F. Stoican, A. Postolache, and I. Prodan, “NURBS-based trajectory design for motion planning in a multi-obstacle environment,” in European control conference (ecc), jun 29-jul 02, 2021, pp. 2014-2019.
[Bibtex]

@inproceedings{WOS:000768455200295,
Author = {Stoican, Florin and Postolache, Alexandra and Prodan, Ionela},
Title = {{NURBS}-based trajectory design for motion planning in a multi-obstacle environment},
Booktitle = {European Control Conference (ECC), Jun 29-Jul 02},
Year = {2021},
Pages = {2014-2019},
doi={10.23919/ECC54610.2021.9654974},
wos = {000768455200295},
abstract={
This work presents a novel solution for the satisfaction of continuous-time constraints through the use of NURBS curves. Exploiting the NURBS functions properties (local support, convexity and positivity) and applying knot refinement strategies, we improve on the sufficient conditions which guarantee obstacle avoidance and the validation of velocity bounds. We show that feasibility and performance are significantly improved with only a moderate (and controllable) increase in complexity. We highlight the approach for off-line trajectory design with obstacle(s) avoidance.}
}

2020

D. Popescu, E. Vlasceanu, M. Dima, F. Stoican, and L. Ichim, “Hybrid sensor network for monitoring environmental parameters,” in 28th mediterranean conference ofn control and automation (med), 2020, pp. 933-938.
[Bibtex]

@inproceedings{WOS:000612207700152,
Author = {Popescu, Dan and Vlasceanu, Emilian and Dima, Marius and Stoican, Florin and Ichim, Loretta},
Title = {Hybrid Sensor Network for Monitoring Environmental Parameters},
Booktitle = {28th Mediterranean Conference ofn Control and Automation (MED)},
Series = {Mediterranean Conference on Control and Automation},
Year = {2020},
Pages = {933-938},
doi = {10.1109/med48518.2020.9183165},
wos = {000612207700152},
abstract = {The paper proposes a cheap hybrid ground-air sensor network for environmental parameter measurements. The ground sensors are grouped into clusters, each cluster having several sensory nodes connected to a
cluster head that sends the relevant data to the aerial, mobile nodes - unmanned aerial vehicles (UAVs). Thus, using optimal trajectories, the
UAVs are used both for measuring directly environmental parameters, as well as for collecting data from ground sensors. The authors present the
modules' implementation of the hybrid system: ordinary sensory nodes, cluster heads, ground control stations, communication modems and UAV platforms. Finally, the performances of the realized hybrid network are
analyzed from multiple points of view: energy consumption, time, and data acquisition efficiency.},
}

D. Ioan, I. Prodan, S. Olaru, F. Stoican, and S. Niculescu, “Navigation in cluttered environments with feasibility guarantees,” in 21st ifac world congress, 2020, pp. 5487-5492.
[Bibtex]

@inproceedings{WOS:000652593000185,
Author = {Ioan, Daniel and Prodan, Ionela and Olaru, Sorin and Stoican, Florin and Niculescu, Silviu-Iulian},
Title = {Navigation in cluttered environments with feasibility guarantees},
Year = {2020},
Pages = {5487-5492},
proceedings = {21st IFAC World Congress},
booktitle = {21st IFAC World Congress},
doi = {10.1016/j.ifacol.2020.12.1554},
wos = {000652593000185},
abstract = {This paper addresses the navigation problem in a multi-obstacle environment and makes use of convex lifting in trajectory planning problems with anti-collision constraints. The design problem is commonly stated in the literature in terms of a constrained optimization problem over a non-convex domain. In our framework, the convex lifting approach plays an instrumental role in the partitioning of the feasible space in accordance with the distribution of obstacles and in the subsequent generation of corridors in cluttered environments. We consider an adaptation of the generic MPC (Model Predictive Control) trajectory tracking problem, aiming to guarantee the feasibility and the convergence. Simulation results and proof of concepts illustrations prove the effectiveness of the proposed approach.},
}

2019

F. Stoican, D. Popescu, and L. Ichim, “Trajectory design for effective and secure communication in uav-wsn systems,” in 2019 ieee radio and antenna days of the indian ocean (radio), 2019, p. 519–524.
[Bibtex]

@inproceedings{stoican2019trajectory,
title={Trajectory Design for Effective and Secure Communication in UAV-WSN Systems},
author={Stoican, Florin and Popescu, Dan and Ichim, Loretta},
booktitle={2019 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)},
pagetotal={2},
year={2019},
xdata={ieee},
doi={10.23919/RADIO46463.2019.8968928},
pages={519--524}
}

D. Popescu, F. Stoican, L. Ichim, G. Stamatescu, and C. Dragana, “Collaborative uav-wsn system for data acquisition and processing in agriculture,” in 2019 10th ieee international conference on intelligent data acquisition and advanced computing systems: technology and applications (idaacs), 2019, p. 519–524.
[Bibtex]

@inproceedings{WOS:000535131600095,
title={Collaborative UAV-WSN System for Data Acquisition and Processing in Agriculture},
author={Popescu, Dan and Stoican, Florin and Ichim, Loretta and Stamatescu, Grigore and Dragana, Cristian},
booktitle={2019 10th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS)},
volume={1},
pages={519--524},
year={2019},
xdata={ieee},
doi={10.1109/IDAACS.2019.8924424},
wos={000535131600095},
abstract={Integration of airborne robotic platforms with networks of intelligent sensor systems on the ground has recently emerged as a robust solution for data collection, analysis and control in various specialised applications. The paper presents a hierarchical structure based on the collaboration between a team of unmanned aerial vehicles and a structure of federated wireless sensor networks for crop monitoring in precision agriculture. Key advantages lay in online data collection and relaying to a central monitoring point while effectively managing network load and latency through optimised UAV trajectories and in situ data processing. The experiments were carried out at the Fundulea National Research Institute where different crops and methods are developed. The results demonstrate the fact that the collaborative UAV-WSN approach implemented in the Romanian project WWI increases the performances both in precision agriculture and ecological agriculture.}
}

M. M. Seron, S. Olaru, F. Stoican, J. A. De Doná, and E. J. Kofman, “On finitely determined minimal robust positively invariant sets,” in 2019 australian & new zealand control conference (anzcc), 2019, p. 157–162.
[Bibtex]

@inproceedings{WOS:000549940000031,
title={On Finitely Determined Minimal Robust Positively Invariant Sets},
author={Seron, Maria M and Olaru, Sorin and Stoican, Florin and De Don{\'a}, Jos{\'e} A and Kofman, Ernesto J},
booktitle={2019 Australian \& New Zealand Control Conference (ANZCC)},
pages={157--162},
year={2019},
xdata={ieee},
doi={10.1109/ANZCC47194.2019.8945678},
wos={000549940000031},
abstract={For linear, time invariant stable systems with additive state disturbances that are hounded by polytopic sets, we establish connections between the minimal robust positively invariant set (mRPI) and ultimate-bound invariant (UBI) sets. We first identify cases for which the mRPI set is finitely determined. We then apply those cases to address the dual problem of finding (i) the A matrix of an LTI system, (ii) a disturbance set and (iii) a projection matrix, for which a given UBI set is a projection of the mRPI set associated with those three elements. Finally, these results are combined to iteratively compute converging outer approximations of the mRPI set associated with a given system via a sequence of sets that are projections of finitely determined mRPI sets in lifted spaces.}
}

D. Popescu, L. Ichim, F. Stoican, and C. Dragana, “Hierarchical Processing of Signals for Smart Crop Monitoring,” in 8th International Conference on Systems and Control. Marrakech, Morocco., 2019, p. 265–270.
[Bibtex]

@inproceedings{WOS:000532743900045,
author = {Popescu, Dan and Ichim, Loretta and Stoican, Florin and Dragana, Cristian-Mihai},
booktitle = {{8th International Conference on Systems and Control. Marrakech, Morocco.}},
proceedings = {{8th International Conference on Systems and Control. Marrakech, Morocco.}},
title = {{Hierarchical Processing of Signals for Smart Crop Monitoring}},
doi={10.1109/ICSC47195.2019.8950528},
pages={265--270},
xdata={ieee},
year={2019},
month=oct,
day={23-25},
wos={000532743900045},
abstract={Smart crop monitoring is a new concept for different modern agricultural research and production management. The paper presents a hierarchical structure of data processing from the sensors used in crop monitoring. The proposed system consists in the integration of multi WSN network at ground level, a team of UAVs at aerial level, with the mission of both direct data acquisition and data collecting from WSN. The information from UAV is next transmitted to a central data analysis and interpretation via internet. To this end, a multi levels data processing structure is proposed: in field processing, fog computing processing and cloud computing processing. The design of an efficient UAV trajectory for collecting of data and obstacle avoidance and, also, a model of intelligent data processing and transmission are proposed.}
}

F. Stoican, D. Popescu, and L. Ichim, “Some Comments on the Constrained Trajectory Generation for UAV Systems,” in 27th Mediterranean Conference on Control and Automation. Akko, Israel, 2019.
[Bibtex]

@inproceedings{WOS:000503268900078,
author = {Stoican, Florin and Popescu, Dan and Ichim, Loretta},
booktitle = {{27th Mediterranean Conference on Control and Automation. Akko, Israel}},
proceedings = {{27th Mediterranean Conference on Control and Automation. Akko, Israel}},
title = {{Some Comments on the Constrained Trajectory Generation for UAV Systems}},
doi={10.1109/MED.2019.8798522},
wos={000503268900078},
xdata={ieee},
month=jul,
day={1 - 4},
year={2019},
abstract={This paper presents a trajectory generation procedure for unmanned vehicles (UAVs) which makes use of the flat-output representation of the UAV model to derive the desired reference trajectory Furthermore, a corrective mechanism whose goal is to minimize the trajectory tracking error in the presence of bounded disturbances is implemented. Exploiting the flat description of the relevant states/inputs and a B-spline parametrization of the flat output, sufficient formulations for input and state magnitude constraints which involve only the B-splines' control points are given. The theoretical results are illustrated over a UAV model in simulation.}
}

D. Ioan, S. Olaru, I. Prodan, F. Stoican, and S. Niculescu, “Navigation in a Multi-Obstacle Environment. From Partition of the Space to a Zonotopic-Based MPC,” in European Control Conference (ECC’19). Naples, Italy., 2019, p. 1772 – 1777.
[Bibtex]

@inproceedings{WOS:000490488301129,
author = {Ioan, Daniel and Olaru, Sorin and Prodan, Ionela and Stoican, Florin and Niculescu, Silviu-Iulian},
booktitle = {{European Control Conference (ECC'19). Naples, Italy.}},
proceedings = {{European Control Conference (ECC'19). Naples, Italy.}},
title = {{Navigation in a Multi-Obstacle Environment. From Partition of the Space to a Zonotopic-Based MPC}},
pages={1772 -- 1777},
doi={10.23919/ECC.2019.8796080},
wos={000490488301129},
month=jun,
day={25-28},
year={2019},
abstract={This paper pertains to the navigation in a multi-obstacle environment and advocates the use of local zonotopic approximations. The design problem is commonly stated in the literature in terms of a constrained optimization problem over a non-convex domain. We show that a partition of the navigation space can be obtained using convex liftings, providing the means to generate a path from the current to a final position. The feasible domain is efficiently described using zonotopes which have a complexity advantage w.r.t. generic polyhedral sets. This work treats the zonotopic approximations from a control perspective, providing a set of conditions able to safeguard the initial domain topology. An adaptation of the generic collision avoidance problem is considered, aiming to guarantee the feasibility and highlighting through simulations the advantages offered by the zonotopic representation.}
}

D. Ioan, S. Olaru, I. Prodan, F. Stoican, and S. Niculescu, “Parametrized Hyperplane Arrangements for Control Design with Collision Avoidance Constraints,” in 15th IEEE International Conference on Control & Automation IEEE ICCA 2019. Edinburgh, Scotland, 2019, p. 1591–1596.
[Bibtex]

@inproceedings{WOS:000651769700269,
author = {Ioan, Daniel and Olaru, Sorin and Prodan, Ionela and Stoican, Florin and Niculescu, Silviu-Iulian},
booktitle = {{15th IEEE International Conference on Control \& Automation IEEE ICCA 2019. Edinburgh, Scotland}},
proceedings = {{15th IEEE International Conference on Control \& Automation IEEE ICCA 2019. Edinburgh, Scotland}},
title = {{Parametrized Hyperplane Arrangements for Control Design with Collision Avoidance Constraints}},
pages={1591--1596},
year={2019},
doi={10.1109/ICCA.2019.8899977},
wos={000651769700269},
abstract={This paper concerns the problem of collision avoidance in a dynamical multi-obstacle environment. The design problem is commonly stated in the literature in terms of a receding-horizon constrained optimization problem over a non-convex domain. Preliminary results based on hyperplane arrangements lead to a mixed-integer formulation of the problem. This formalism is adequate for a static multiobstacle environment, but may be impractical in a dynamical context. Nevertheless, this shortcoming can be alleviated by considering an additional analysis step and by an appropriate proper choice of the representation of the environment in a time-varying framework. The present paper tackles this issue by using zonotopes and discussing their parametrization in a collision avoidance type of application.}
}

F. Stoican, I. Prodan, E. I. Grotli, and N. N. Thinh, “Inspection Trajectory Planning for 3D Structures under a Mixed-Integer Framework,” in 15th IEEE International Conference on Control & Automation IEEE ICCA 2019. Edinburgh, Scotland, 2019, p. 1349–1354.
[Bibtex]

@inproceedings{WOS:000651769700228,
author = {Stoican, Florin and Prodan, Ionela and Grotli, Esten Ingar and Nguyen Ngoch Thinh},
booktitle = {{15th IEEE International Conference on Control \& Automation IEEE ICCA 2019. Edinburgh, Scotland}},
proceedings = {{15th IEEE International Conference on Control \& Automation IEEE ICCA 2019. Edinburgh, Scotland}},
title = {{Inspection Trajectory Planning for 3D Structures under a Mixed-Integer Framework}},
pages={1349--1354},
doi={10.1109/ICCA.2019.8899514},
wos={000651769700228},
month=jul,
day={16-19},
year={2019},
abstract={
This paper extends our previous work on constrained trajectory generation for UAVs (Unmanned Aerial Vehicles) with the task of fully covering an a priori known 3D structure. The novelty resides in the geometrical approach we adopt to describe sufficient coverage constraints in a mixed-integer formulation.
The combined use of hyperplane arrangement, cell merging procedures and mixed-integer formulations provides feasible "viewpoint" regions through which the trajectory has to pass. The selected viewpoints with their corresponding feasible cells allow the vehicle to fully cover the 3D structure. The tools used and the results obtained are exemplified over a particular quadcopter system.},
}

D. Ioan, S. Olaru, I. Prodan, F. Stoican, and S. Niculescu, “Complexity Bounds for Obstacle Avoidance within a Zonotopic Framework,” in 2019 American Control Conference July 10 – 12, Philadelphia, PA, USA, 2019, p. 335–340.
[Bibtex]

@inproceedings{WOS:000589452900055,
author = {Ioan, Daniel and Olaru, Sorin and Prodan, Ionela and Stoican, Florin and Niculescu, Silviu-Iulian},
booktitle = {{2019 American Control Conference July 10 - 12, Philadelphia, PA, USA}},
proceedings = {{2019 American Control Conference July 10 - 12, Philadelphia, PA, USA}},
title = {{Complexity Bounds for Obstacle Avoidance within a Zonotopic Framework}},
pages={335--340},
year={2019},
doi={10.23919/ACC.2019.8814976},
wos={000589452900055},
abstract={This paper addresses the problem of collision avoidance in a multi-obstacle environment and focuses on its representation in optimization-based control problems. The design problem is commonly stated in the literature in terms of a constrained optimization problem over a non-convex domain. Preliminary results make use of hyperplane arrangements to characterize these regions. The current paper considers additional structural constraints by the use of zonotopic over-approximation and highlights their benefits when introduced in the obstacle avoidance problem. Comparisons with classical sampled-based approaches are presented through simulations.},
}

A. -M. Stoica, T. -V. Chelaru, F. Stoican, and B. D. Ciubotaru, “A Kalman Filtering Approach for Systems Subject to Parametric Modeling Uncertainties,” in 21st IFAC Symposium on Automatic Control in Aerospace, 27-30 August, 2019. Cranfield, UK, 2019, p. 400–404.
[Bibtex]

@inproceedings{WOS:000498881800067,
author = {Stoica, A.-M. and Chelaru, T.-V. and Stoican, F. and Ciubotaru, B. D.},
booktitle = {{21st IFAC Symposium on Automatic Control in Aerospace, 27-30 August, 2019. Cranfield, UK}},
proceedings = {{21st IFAC Symposium on Automatic Control in Aerospace, 27-30 August, 2019. Cranfield, UK}},
title = {{A Kalman Filtering Approach for Systems Subject to Parametric Modeling Uncertainties}},
year={2019},
doi={10.1016/j.ifacol.2019.11.276},
pages={400--404},
wos={000498881800067},
abstract={The paper presents a Kalman type filtering problem for linear systems with parametric uncertainties. A stochastic model with state dependent noise both in the state and in the output equations is used to represent the system with uncertain parameters. The solution of the filtering problem is a Kalman type filter whose gain is determined by solving the H-2 optimization problem resulting from the coupling between the filter and the stochastic system with multiplicative noise. It is proved that this optimal gain results by solving a trace minimization problem with constraints expressed in terms of a system of matrix inequalities. The theoretical developments are illustrated by a case study aiming to estimate the states of the pitch dynamics of a space launch vehicle.}
}

I. Prodan, F. Stoican, and C. Louembet, “Necessary and sufficient LMI conditions for constraints satisfaction within a B-spline framework,” in 58th IEEE Conference on Decision and Control, Nice, France, 2019, p. 8061–8066.
[Bibtex]

@inproceedings{WOS:000560779007051,
author = {Prodan, I. and Stoican, F. and Louembet, C.},
booktitle = {{58th IEEE Conference on Decision and Control, Nice, France}},
proceedings = {{58th IEEE Conference on Decision and Control, Nice, France}},
title = {{Necessary and sufficient {LMI} conditions for constraints satisfaction within a {B-spline} framework}},
pages={8061--8066},
doi={10.1109/CDC40024.2019.9030240},
wos={000560779007051},
xdata={ieee},
month=dec,
day={11-13},
year={2019},
abstract={This work presents a novel solution for the satisfaction of continuous-time constraints through the use of B-spline curves. Exploiting the B-splines functions properties (local support, convexity and positivity), we provide necessary and sufficient LMI (Linear Matrix Inequalities)-based conditions for the satisfaction of continuous-time constraints. We consider both inclusion and exclusion constraints (in relation with a predefined convex domain) and implement the latter as a MISDP (Mixed integer - Semi-definite Programming) problem. We highlight the approach for the motion planning issue of off-line trajectory generation with obstacle(s) avoidance guarantees.}
}

2018

F. Stoican, F. Petzke, I. Prodan, and S. Streif, “Hierarchical Control with Guaranteed Fault Diagnosability,” in 10th International-Federation-of-Automatic-Control (IFAC) Symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS), 2018, pp. 1105-1110.
[Bibtex]

@inproceedings{WOS:000447016900162,
IF = {0.25},
author = {Stoican, Florin and Petzke, Felix and Prodan, Ionela and Streif, Stefan},
booktitle = {10th {I}nternational-{F}ederation-of-{A}utomatic-{C}ontrol ({IFAC}) {S}ymposium on {F}ault {D}etection, {S}upervision and {S}afety for {T}echnical {P}rocesses ({SAFEPROCESS})},
cites = {0},
citews = {0},
doi = {10.1016/j.ifacol.2018.09.729},
eid = {2-s2.0-85054590399},
international = {1},
isbn = {},
issn = {2405-8963},
issue = {24},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054590399&doi=10.1016%2fj.ifacol.2018.09.729&partnerID=40&md5=52f4082598b0324f4f67eccdb8141a1a},
pages = {1105-1110},
proceedings = {10th {I}nternational-{F}ederation-of-{A}utomatic-{C}ontrol ({IFAC}) {S}ymposium on {F}ault {D}etection, {S}upervision and {S}afety for {T}echnical {P}rocesses ({SAFEPROCESS})},
xdata={elsevier},
title = {{H}ierarchical {C}ontrol with {G}uaranteed {F}ault {D}iagnosability},
vol = {51},
worldcat = {0},
wos = {000447016900162},
year = {2018},
abstract={A multiple time-scale hierarchical control approach with guarantees for active fault diagnosability (detection and isolation) is presented. Robust positive invariance notions are used to provide a set-membership test for FDI validation at the low level and sufficient constraints for guaranteeing FDI at the high level. Due to the computational burden of the involved bilinear optimization problem, the high-level reference governor operates at a slower sampling time than the controller of the low-level system. Therefore, corner cutting avoidance constraints are imposed such that the faster-sampled lower level is still guaranteed to function properly. A case study illustrates the presented theoretical notions. }
}

F. Stoican, D. Popescu, and L. Ichim, “A Geometrical Interpretation of Communication Restrictions in a Multi-Agent Environment,” in 2018 IEEE Radio and Antenna Days of the Indian Ocean, RADIO 2018, 2018, pp. 1-2.
[Bibtex]

@inproceedings{WOS:000457734500027,
IF = {0.25},
author = {Stoican, Florin and Popescu, Dan and Ichim, Loretta},
booktitle = {2018 {IEEE} {R}adio and {A}ntenna {D}ays of the {I}ndian {O}cean, {RADIO} 2018},
cites = {0},
citews = {0},
doi = {10.23919/RADIO.2018.8572375},
eid = {2-s2.0-85060386730},
international = {1},
isbn = {9789994904709},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85060386730&doi=10.23919%2fRADIO.2018.8572375&partnerID=40&md5=d7d89b8a3024895dda294ab66ee8fe35},
pages = {1-2},
proceedings = {2018 {IEEE} {R}adio and {A}ntenna {D}ays of the {I}ndian {O}cean, {RADIO} 2018},
xdata={ieee},
title = {{A} {G}eometrical {I}nterpretation of {C}ommunication {R}estrictions in a {M}ulti-{A}gent {E}nvironment},
vol = {},
worldcat = {0},
wos = {000457734500027},
year = {2018},
abstract={In this paper we consider a multi-obstacle environment in which ground terminal stations (GDTs) exchange information with unmanned aerial vehicles (UAVs) engaged in fulfilling a data gathering mission (i.e., a list of way-points defining sensor cluster heads is covered by the UAVs). We discuss limitations imposed by the terrain (obstacles), UAV dynamics and GDT characteristics and provide reference trajectories which ensure communication at all times. The associated optimization problem is put in a mixed integer form which guarantees the aforementioned constraints and minimizes the mission cost.}
}

F. Stoican, I. Prodan, D. Popescu, L. Ichim, and E. Vlsceanu, “Mixed-Integer Representations for Mission Constraints in a Multi-Agent Team,” in 15th International Conference on Control, Automation, Robotics and Vision, ICARCV 2018, 2018, pp. 562-567.
[Bibtex]

@inproceedings{WOS:000459847700095,
IF = {0.25},
author = {Stoican, Florin and Prodan, Ionela and Popescu, Dan and Ichim, Loretta and Vlsceanu, Emilian},
booktitle = {15th {I}nternational {C}onference on {C}ontrol, {A}utomation, {R}obotics and {V}ision, {ICARCV} 2018},
cites = {0},
citews = {0},
doi = {10.1109/ICARCV.2018.8580636},
eid = {2-s2.0-85060781555},
international = {1},
isbn = {9781538695821},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85060781555&doi=10.1109%2fICARCV.2018.8580636&partnerID=40&md5=3ea03019b9a77e0c1d7353dd26ae9448},
pages = {562-567},
proceedings = {2018 15th {I}nternational {C}onference on {C}ontrol, {A}utomation, {R}obotics and {V}ision, {ICARCV} 2018},
xdata={ieee},
title = {{M}ixed-{I}nteger {R}epresentations for {M}ission {C}onstraints in a {M}ulti-{A}gent {T}eam},
vol = {},
worldcat = {0},
wos = {000459847700095},
year = {2018},
abstract={In this paper we consider a multi-UAV formation whose goal is to efficiently gather data from sensors deployed in a cluttered environment while in the same time keeping communication with ground terminals. We formulate these requirements and constraints as a nonlinear constrained optimization problem and recast them in a mixed-integer form with the help of a hyperplane arrangement construction. Particular attention is given to line-of-sight constraints which ensure permanent communication between UAVs and ground terminals. Reference trajectories are generated in simulation over illustrative examples.}
}

D. Popescu, L. Ichim, and F. Stoican, “Flooded Area Segmentation from UAV Images Based on Generative Adversarial Networks,” in 15th International Conference on Control, Automation, Robotics and Vision, ICARCV 2018, 2018, pp. 1361-1366.
[Bibtex]

@inproceedings{WOS:000459847700229,
IF = {0.25},
author = {Popescu, Dan and Ichim, Loretta and Stoican, Florin},
booktitle = {15th {I}nternational {C}onference on {C}ontrol, {A}utomation, {R}obotics and {V}ision, {ICARCV} 2018},
cites = {0},
citews = {0},
doi = {10.1109/ICARCV.2018.8581341},
eid = {2-s2.0-85060805155},
international = {1},
isbn = {9781538695821},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85060805155&doi=10.1109%2fICARCV.2018.8581341&partnerID=40&md5=ed95410797528c9d17e2f6c16c0b6026},
pages = {1361-1366},
proceedings = {15th {I}nternational {C}onference on {C}ontrol, {A}utomation, {R}obotics and {V}ision, {ICARCV} 2018},
xdata={ieee},
title = {{F}looded {A}rea {S}egmentation from {UAV} {I}mages {B}ased on {G}enerative {A}dversarial {N}etworks},
vol = {},
worldcat = {0},
wos = {000459847700229},
year = {2018},
abstract={The detection, localization and evaluation of small flooded areas can contribute to decrease the economical damages of such disasters. The cheapest and most accurate method is to segment the aerial images taken from UAV. In this paper, we propose a new method for detection of regions of interest, like flooding in rural areas, using Generative Adversarial Networks (GAN) and Graphics Processing Units (GPU). The classical GPU is used to create, by parallel calculation of textural features, extracted from the co-occurrence matrix, the supervised mask of flood segmentation in the images from the learning set. Based on these images and their associated real masks, the weights of the generator and discriminator are established. A set of 40 images were used for the learning phase and another set of 60 images were used for method validation. The results demonstrate that the proposed method provide a high accuracy and robustness, comparing with other papers for flooding evaluation. Even if it is a relative long time to learn the GAN, in the operational phase the time for image segmentation process is very short.}
}

2017

P. Irofti and F. Stoican, “Dictionary learning strategies for sensor placement and leakage isolation in water networks,” in 20th World Congress of the International-Federation-of-Automatic-Control (IFAC), 2017, pp. 1553-1558.
[Bibtex]

@inproceedings{WOS:000423845200252,
IF = {0.25},
author = {Irofti, Paul and Stoican, Florin},
booktitle = {20th {W}orld {C}ongress of the {I}nternational-{F}ederation-of-{A}utomatic-{C}ontrol ({IFAC})},
cites = {1},
citews = {0},
doi = {10.1016/j.ifacol.2017.08.308},
eid = {2-s2.0-85031780069},
international = {1},
isbn = {},
issn = {2405-8963},
issue = {1},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85031780069&doi=10.1016%2fj.ifacol.2017.08.308&partnerID=40&md5=5ec5094c5ec8d15d3ed286b3e67343a6},
pages = {1553-1558},
proceedings = {20th {W}orld {C}ongress of the {I}nternational-{F}ederation-of-{A}utomatic-{C}ontrol ({IFAC})},
publisher = {{E}lsevier},
qcat = {},
qtop = {-1},
title = {{D}ictionary learning strategies for sensor placement and leakage isolation in water networks},
vol = {50},
worldcat = {0},
wos = {000423845200252},
year = {2017},
abstract={This paper handles pipe leakage in water networks through a fault detection and isolation mechanism coupled with dictionary learning strategies. We consider sparse representation strategies for sensor placement and subsequent dictionary learning and classification for accurate fault detection and isolation. Various sensor placement strategies are proposed and it is shown that faults with varying magnitudes are correctly identified in a detailed emulation benchmark.}
}

N. T. Nguyen, I. Prodan, F. Stoican, and L. Lefevre, “Reliable nonlinear control for quadcopter trajectory tracking through differential flatness,” in 20th World Congress of the International-Federation-of-Automatic-Control (IFAC), 2017, pp. 6971-6976.
[Bibtex]

@inproceedings{WOS:000423964900158,
IF = {0.25},
author = {Ngoc Thinh Nguyen and Prodan, Ionela and Stoican, Florin and Lefevre, Laurent},
booktitle = {20th {W}orld {C}ongress of the {I}nternational-{F}ederation-of-{A}utomatic-{C}ontrol ({IFAC})},
cites = {3},
citews = {1},
doi = {10.1016/j.ifacol.2017.08.1338},
eid = {2-s2.0-85027890024},
international = {1},
isbn = {},
issn = {2405-8963},
issue = {1},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85027890024&doi=10.1016%2fj.ifacol.2017.08.1338&partnerID=40&md5=5dc72d8dd6769b7257dae92b13cdb94e},
pages = {6971-6976},
proceedings = {20th {W}orld {C}ongress of the {I}nternational-{F}ederation-of-{A}utomatic-{C}ontrol ({IFAC})},
xdata={ieee},
title = {{R}eliable nonlinear control for quadcopter trajectory tracking through differential flatness},
vol = {50},
worldcat = {0},
wos = {000423964900158},
year = {2017},
abstract={This paper addresses the trajectory tracking problem for a quadcopter system under nominal and fault-affected scenarios (in the latter case, due to stuck actuator(s)). Differential flatness is employed for trajectory generation and control design. The particularity resides in that a full parametrization of the states and inputs is given without any assumptions or simplifications on the quadcopter dynamics. Furthermore, using the properties of flatness and a combination between computed torque control and feedback linearization, a two-layer control design is proposed. The tracking performances and stability gurantees are analyzed for nominal and faulty functioning under extensive simulations. }
}

F. Stoican, I. Prodan, D. Popescu, and L. Ichim, “Constrained trajectory generation for UAV systems using a B-spline parametrization,” in 25th Mediterranean Conference on Control and Automation, MED 2017, 2017, pp. 613-618.
[Bibtex]

@inproceedings{WOS:000426926300100,
IF = {0.25},
author = {Stoican, Florin and Prodan, Ionela and Popescu, Dan and Ichim, Loretta},
booktitle = {25th {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2017},
cites = {3},
citews = {1},
doi = {10.1109/MED.2017.7984185},
eid = {2-s2.0-85027839276},
international = {1},
isbn = {9781509045334},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85027839276&doi=10.1109%2fMED.2017.7984185&partnerID=40&md5=4980650ef95e8cae2fd7126702cfea80},
pages = {613-618},
proceedings = {2017 25th {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2017},
xdata={ieee},
title = {{C}onstrained trajectory generation for {UAV} systems using a {B}-spline parametrization},
vol = {},
worldcat = {0},
wos = {000426926300100},
year = {2017},
abstract={This paper extends some previous work on trajectory generation for UAV (Unmanned Aerial Vehicles) using differential flatness in combination with B-splines parametrization. The originality of this work resides in the geometrical interpretations of the B-splines properties and their use in generating feasible flat trajectories for nonlinear UAV dynamics while ensuring continuous constraint validation. Of particular interest (and difficulty) are constraints involving system inputs since often the mapping between the input and the flat output space is strongly nonlinear. The tools used and the results obtained are exemplified over a particular UAV dynamical system and can be generalized to any nonlinear system admitting a flat description.}
}

O. Chenaru, D. Popescu, D. Enache, L. Ichim, and F. Stoican, “Improving operational security for web-based distributed control systems in wastewater management,” in 25th Mediterranean Conference on Control and Automation, MED 2017, 2017, pp. 1089-1093.
[Bibtex]

@inproceedings{WOS:000426926300178,
IF = {0.25},
author = {Chenaru, Oana and Popescu, Dan and Enache, Dragos and Ichim, Loretta and Stoican, Florin},
booktitle = {25th {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2017},
cites = {0},
citews = {0},
doi = {10.1109/MED.2017.7984263},
eid = {2-s2.0-85028503305},
international = {1},
isbn = {9781509045334},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028503305&doi=10.1109%2fMED.2017.7984263&partnerID=40&md5=4fb23b5c8ca049d1010eb2f8ee66abc7},
pages = {1089-1093},
proceedings = {2017 25th {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2017},
xdata={ieee},
title = {{I}mproving operational security for web-based distributed control systems in wastewater management},
vol = {},
worldcat = {0},
wos = {000426926300178},
year = {2017},
abstract={Traditional industrial systems have been designed to ne intrinsically safe by isolating their monitoring and control network. Considering the possible impact of a security attack, many plants today still choose to use this method to ensure maximum protection. At the same time, a separate trend observed in highly distributed applications like water management systems, is to centralize more local SCADA sites, into a Regional Control Center (RCC). This allows more efficient operation of existing resources and even integration with high level applications like water network modelling and simulation tools. Typical network include Ethernet and GSM communication.
In order to benefit most from the implementation of plant-wide applications with reduced operating costs, increased flexibility and availability we need to address correctly the security aspects. This paper presents a methodology for improving operational security in a wastewater treatment plant and exemplifies its implementation in a specific application.}
}

D. Ioan, F. Stoican, and K. Worthmann, “Active fault detection and isolation in a zonotopic framework,” in 21st International Conference on System Theory, Control and Computing, ICSTCC 2017, 2017, pp. 595-600.
[Bibtex]

@inproceedings{WOS:000427419900098,
IF = {0.25},
author = {Ioan, Daniel-Mihail and Stoican, Florin and Worthmann, Karl},
booktitle = {21st {I}nternational {C}onference on {S}ystem {T}heory, {C}ontrol and {C}omputing, {ICSTCC} 2017},
cites = {0},
citews = {0},
doi = {10.1109/ICSTCC.2017.8107100},
eid = {2-s2.0-85040570687},
international = {1},
isbn = {9781538638422},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85040570687&doi=10.1109%2fICSTCC.2017.8107100&partnerID=40&md5=abfbf130b0243c982947d07bb2b5b9f8},
pages = {595-600},
proceedings = {2017 21st {I}nternational {C}onference on {S}ystem {T}heory, {C}ontrol and {C}omputing, {ICSTCC} 2017},
xdata={ieee},
title = {{A}ctive fault detection and isolation in a zonotopic framework},
vol = {},
worldcat = {0},
wos = {000427419900098},
year = {2017},
abstract={We consider a plant affected by multiple faults (modeled through a piecewise affine formalism). Using a bank of finite-window observers and an artificially-induced feedback delay we provide an exact fault detection and isolation (FDI) mechanism, integrated into the overall fault tolerant control scheme. We use zonotopic characterizations for the sets of interest in order to provide explicit conditions for FDI exactness (such that a fault occurrence can be signaled unambiguously) and to alleviate the numerical issues specific to set operations.}
}

2016

F. Stoican and D. Popescu, “Trajectory generation with way-point constraints for UAV systems,” in 24th International Conference on Robotics in Alpe-Adria-Danube Region, RAAD 2015, 2016, pp. 379-386.
[Bibtex]

@inproceedings{WOS:000381804400038,
IF = {0.25},
author = {Stoican, Florin and Popescu, Dan},
booktitle = {24th {I}nternational {C}onference on {R}obotics in {A}lpe-{A}dria-{D}anube {R}egion, {RAAD} 2015},
cites = {1},
citews = {1},
doi = {10.1007/978-3-319-21290-6_38},
eid = {2-s2.0-84983209088},
international = {1},
isbn = {9783319212890},
issn = {2194-5357},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84983209088&doi=10.1007%2f978-3-319-21290-6_38&partnerID=40&md5=b17c80526b6d8a21aec1f84a051fff3a},
pages = {379-386},
proceedings = {{A}dvances in {I}ntelligent {S}ystems and {C}omputing},
xdata={springer},
title = {{T}rajectory generation with way-point constraints for {UAV} systems},
vol = {371},
worldcat = {0},
wos = {000381804400038},
year = {2016},
abstract={This paper addresses some alternatives to classical trajectory generation for an unmanned aerial vehicle (UAV) which needs to pass through (or near) a priori given way-points. Using differential flatness for trajectory generation and B-splines for the flat output parameterization, the current study concentrates on flat descriptions which respect to UAV dynamics and verify way-point constraints.}
}

D. Popescu, L. Ichim, D. Gornea, and F. Stoican, “Complex image processing using correlated color information,” in 17th International Conference on Advanced Concepts for Intelligent Vision Systems, ACIVS 2016, 2016, pp. 723-734.
[Bibtex]

@inproceedings{WOS:000390177400063,
IF = {0.25},
author = {Popescu, Dan and Ichim, Loretta and Gornea, Diana and Stoican, Florin},
booktitle = {17th {I}nternational {C}onference on {A}dvanced {C}oncepts for {I}ntelligent {V}ision {S}ystems, {ACIVS} 2016},
cites = {3},
citews = {3},
doi = {10.1007/978-3-319-48680-2_63},
eid = {2-s2.0-84994417096},
international = {1},
isbn = {9783319486796},
issn = {0302-9743},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994417096&doi=10.1007%2f978-3-319-48680-2_63&partnerID=40&md5=38f30a6d0d468e71a7c3d12bc229a5ad},
pages = {723-734},
proceedings = {{L}ecture {N}otes in {C}omputer {S}cience (including subseries {L}ecture {N}otes in {A}rtificial {I}ntelligence and {L}ecture {N}otes in {B}ioinformatics)},
xdata={springer},
title = {{C}omplex image processing using correlated color information},
vol = {10016 LNCS},
worldcat = {0},
wos = {000390177400063},
year = {2016},
abstract={The paper presents a method for patch classification and remote image segmentation based on correlated color information. During the training phase, a supervised learning algorithm is considered. In the testing phase, we used the classifier built a priori to predict which class an input image sample belongs to. The tests showed that the most relevant features are contrast, energy and homogeneity extracted from the co-occurrence matrix between H and S components. Compared to gray-level, the chromatic matrices improve the process of texture classification. For experimental results, the images were acquired by the aid of an unmanned aerial vehicle and represent various types of terrain. Two case studies have shown that the proposed method is more effective than considering separate color channels: flooded area and road segmentation. Also it is shown that the new algorithm provides a faster execution time than the similar one proposed.}
}

F. Stoican, V. Ivanusca, I. Prodan, and D. Popescu, “Obstacle avoidance via B-spline parametrizations of flat trajectories,” in 24th Mediterranean Conference on Control and Automation (MED), 2016, pp. 1002-1007.
[Bibtex]

@inproceedings{WOS:000391154900167,
IF = {0.25},
author = {Stoican, Florin and Ivanusca, Vlad-Mihai and Prodan, Ionela and Popescu, Dan},
booktitle = {24th {M}editerranean {C}onference on {C}ontrol and {A}utomation ({MED})},
cites = {0},
citews = {0},
doi = {},
eid = {},
international = {1},
isbn = {},
issn = {2325-369X},
issue = {},
link_scopus = {},
pages = {1002-1007},
proceedings = {2016 24{TH} {MEDITERRANEAN} {CONFERENCE} {ON} {CONTROL} {AND} {AUTOMATION} ({MED})},
xdata={ieee},
title = {{O}bstacle avoidance via {B}-spline parametrizations of flat trajectories},
vol = {},
worldcat = {0},
wos = {000391154900167},
year = {2016},
doi={10.1109/MED.2016.7536053},
abstract={This paper considers the collision avoidance problem in a multi-agent multi-obstacle framework. The originality in solving this intensively studied problem resides in the proposed geometrical view combined with differential flatness for trajectory generation and B-splines for the flat output parametrization. Using some important properties of these theoretical tools we show that the constraints can be validated at all times. Exact and sub-optimal constructions of the collision avoidance optimization problem are provided. The results are validated through extensive simulations over standard autonomous aerial vehicle dynamics.}
}

I. Prodan, F. Stoican, and E. I. Grotli, “Some remarks on potential field constructions in a multi-obstacle environment,” in 10th IFAC Conference on Control Applications in Marine Systems (CAMS), 2016, pp. 28-33.
[Bibtex]

@inproceedings{WOS:000401252400005,
IF = {0.25},
author = {Prodan, Ionela and Stoican, Florin and Grotli, Esten Ingar},
booktitle = {10th {IFAC} {C}onference on {C}ontrol {A}pplications in {M}arine {S}ystems ({CAMS})},
cites = {0},
citews = {0},
doi = {10.1016/j.ifacol.2016.10.317},
eid = {2-s2.0-84994140372},
international = {1},
isbn = {},
issn = {2405-8963},
issue = {23},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994140372&doi=10.1016%2fj.ifacol.2016.10.317&partnerID=40&md5=bb1a3c0d8b6cc3ee692fed17a449397b},
pages = {28-33},
proceedings = {10th {IFAC} {C}onference on {C}ontrol {A}pplications in {M}arine {S}ystems ({CAMS})},
xdata={elsevier},
title = {{S}ome remarks on potential field constructions in a multi-obstacle environment},
vol = {49},
worldcat = {0},
wos = {000401252400005},
year = {2016},
abstract={This paper addresses a novel combination between mixed-integer representations and potential field constructions for typical multi-agent marine control problems. First, we prove that for any kind of repulsive functions applied over a function which we denote as suns function, the feasible domain is piece-wise affine (PWA). Next, concepts like hyperplane arrangements together with potential field approaches are used for providing an efficient description of the Feasible non-convex domain. This combination offers an original and beneficent computation of control laws under non-convex constraints. Simulation results over a common application of obstacle avoidance, which Can be extended for unmanned surface vehicles, prove the effectiveness of the proposed approach.}
}

2015

I. Prodan, F. Stoican, and E. Zio, “On a fault tolerant strategy for efficient energy management in microgrid systems,” in 5th ifac conference on nonlinear model predictive control nmpc 2015, 2015, pp. 458-463.
[Bibtex]

@inproceedings{WOS:000375847100068,
author = {Prodan,I. and Stoican,F. and Zio,E.},
booktitle = {5th IFAC Conference on Nonlinear Model Predictive Control NMPC 2015},
cites = {0},
citews = {0},
doi = {10.1016/j.ifacol.2015.11.321},
eid = {2-s2.0-84964200020},
international = {1},
isbn = {},
issn = {2405-8963},
issue = {23},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964200020&doi=10.1016%2fj.ifacol.2015.11.321&partnerID=40&md5=b3f3f4758dd952253356edaf957195a5},
pages = {458-463},
proceedings = {5th IFAC Conference on Nonlinear Model Predictive Control NMPC 2015},
xdata = {elsevier},
title = {{O}n a fault tolerant strategy for efficient energy management in microgrid systems},
vol = {48},
worldcat = {0},
wos = {000375847100068},
year = {2015},
abstract = {This paper addresses the microgrid energy management problem Wit bin a coherent framework of control tools based on Mixed-Integer Linear Programming (MILP) and constrained Model Predictive Control (MPC). These help characterize the microgrid components' dynamics and the overall system control architecture. A fault tolerant strategy is considered in order to ensure the proper amount of energy in the storage devices such that (together with the utility grid) the essential consumer demand is reliably covered. Simulation results on a particular microgrid architecture validate the proposed approach.}
}

F. Stoican, E. Ingar Grøtli, I. Prodan, and C. Oară, “On corner cutting in multi-obstacle avoidance problems,” in 5th ifac conference on nonlinear model predictive control nmpc 2015, 2015, pp. 185-190.
[Bibtex]

@inproceedings{WOS:000375847100028,
author = {Stoican,F. and Ingar Grøtli,E. and Prodan,I. and Oară,C.},
booktitle = {5th IFAC Conference on Nonlinear Model Predictive Control NMPC 2015},
cites = {2},
citews = {1},
doi = {10.1016/j.ifacol.2015.11.281},
eid = {2-s2.0-84964219468},
international = {1},
isbn = {},
issn = {2405-8963},
issue = {23},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964219468&doi=10.1016%2fj.ifacol.2015.11.281&partnerID=40&md5=9e047f6eda55e06b166971275ab452b8},
pages = {185-190},
proceedings = {5th IFAC Conference on Nonlinear Model Predictive Control NMPC 2015},
publisher = {{E}lsevier},
title = {{O}n corner cutting in multi-obstacle avoidance problems},
vol = {48},
worldcat = {0},
wos = {000375847100028},
year = {2015},
abstract={One challenging 1 not extensively studied issue in obstacle avoidance is the corner cutting problem. Avoidance-,trattits are usually imposed at the sampli mg time without regards to the mt ra-sample behavior of the dynamics. 'Flits paper improves upon state of the art by describing a multi-obstacle environment over a hyperplaiw arrangement, scaffolding, provides a piecewise description of the "shadow" regions and represents them into a combined mixed integer and predictive control formulation. Furthermore, over-approximation constraints which reduce to strictly binary formulations are discussed in detail. Illustrative proofs of concept, comparisons will I. the state of the art and simulation results over a classical multi-obstacle avoidance problem validate the benefits of the proposed approach.}
}

F. Stoican, I. Prodan, and D. Popescu, “Flat trajectory generation for way-points relaxations and obstacle avoidance,” in 23rd Mediterranean Conference on Control and Automation, MED 2015, 2015, pp. 695-700.
[Bibtex]

@inproceedings{WOS:000375056800107,
IF = {0.25},
author = {Stoican, Florin and Prodan, Ionela and Popescu, Dan},
booktitle = {23rd {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2015},
cites = {4},
citews = {1},
doi = {10.1109/MED.2015.7158827},
eid = {2-s2.0-84945967558},
international = {1},
isbn = {9781479999361},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945967558&doi=10.1109%2fMED.2015.7158827&partnerID=40&md5=0de0aa57a07f0c2e15364f1f8d613860},
pages = {695-700},
proceedings = {2015 23rd {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2015 - {C}onference {P}roceedings},
xdata={ieee},
title = {{F}lat trajectory generation for way-points relaxations and obstacle avoidance},
vol = {},
worldcat = {0},
wos = {000375056800107},
year = {2015},
abstract = {This paper addresses some alternatives to classical trajectory generation for an autonomous vehicle which needs to pass through a priori given way-points. Using differential flatness for trajectory generation and B-splines for the flat output parametrization, the current study concentrates on constraint relaxations and on obstacle avoidance conditions. The results are validated through simulations over standard UAV dynamics.}
}

F. Stoican, D. Popescu, E. Vlasceanu, and C. Mateescu, “Geometrical considerations for photogrammetry missions in an UAV context,” in 19th International Conference on System Theory, Control and Computing, ICSTCC 2015 – Joint Conference SINTES 19, SACCS 15, SIMSIS 19, 2015, pp. 765-769.
[Bibtex]

@inproceedings{WOS:000382384100127,
IF = {0.25},
author = {Stoican, Florin and Popescu, Dan and Vlasceanu, Emilian and Mateescu, Cristian},
booktitle = {19th {I}nternational {C}onference on {S}ystem {T}heory, {C}ontrol and {C}omputing, {ICSTCC} 2015 - {J}oint {C}onference {SINTES} 19, {SACCS} 15, {SIMSIS} 19},
cites = {0},
citews = {0},
doi = {10.1109/ICSTCC.2015.7321386},
eid = {2-s2.0-84957827736},
international = {1},
isbn = {9781479984817},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84957827736&doi=10.1109%2fICSTCC.2015.7321386&partnerID=40&md5=1977f39c247aada34df43d41b5db6f85},
pages = {765-769},
proceedings = {2015 19th {I}nternational {C}onference on {S}ystem {T}heory, {C}ontrol and {C}omputing, {ICSTCC} 2015 - {J}oint {C}onference {SINTES} 19, {SACCS} 15, {SIMSIS} 19},
xdata={ieee},
title = {{G}eometrical considerations for photogrammetry missions in an {UAV} context},
vol = {},
worldcat = {0},
wos = {000382384100127},
year = {2015},
abstract={This paper discusses a practical implementation for photogrammetry missions in an UAV setting. Further advances, which exploit geometrical properties of the problem are considered. In particular, a bi-level optimization procedure which minimizes the total path-length is discussed. Various constraints and limitations are taken into account.}
}

2014

I. Necoară, F. Stoican, D. Clipici, A. Pătrașcu, and M. Hovd, “A linear MPC algorithm for embedded systems with computational complexity guarantees,” in 2014 18th International Conference on System Theory, Control and Computing, ICSTCC 2014, 2014, pp. 363-368.
[Bibtex]

@inproceedings{WOS:000704338900059,
author = {Necoară,I. and Stoican,F. and Clipici,D. and Pătrașcu,A. and Hovd,M.},
booktitle = {2014 18th {I}nternational {C}onference on {S}ystem {T}heory, {C}ontrol and {C}omputing, {ICSTCC} 2014},
cites = {0},
citews = {0},
doi = {10.1109/ICSTCC.2014.6982443},
eid = {2-s2.0-84929431542},
international = {1},
isbn = {9781479946013},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929431542&doi=10.1109%2fICSTCC.2014.6982443&partnerID=40&md5=0df65e98aa8de3b0cfaa9d36e916ad49},
pages = {363-368},
proceedings = {2014 18th {I}nternational {C}onference on {S}ystem {T}heory, {C}ontrol and {C}omputing, {ICSTCC} 2014},
xdata={ieee},
qcat = {},
qtop = {-1},
title = {{A} linear {MPC} algorithm for embedded systems with computational complexity guarantees},
vol = {},
worldcat = {0},
wos = {000704338900059},
year = {2014},
abstract = {In this paper we propose a linear MPC scheme for embedded systems based on the dual fast gradient algorithm for solving the corresponding control problem. We establish computational complexity guarantees for the MPC scheme by appropriately deriving tight convergence estimates of order O(1/k(2)) for an average primal sequence generated by our proposed numerical optimization algorithm. We also show that these estimates rely heavily upon the dual optimal variables (Lagrange multipliers). Since convergence certification in embedded MPC is essential, we also derive tight bounds on the norm of these dual optimal variables. However, computing the norm for the Lagrange multipliers associated to multi-parametric optimization problems can quickly become intractable for high dimension and/or a large set of constraints. Therefore, we recast the problem in a mixed integer formulation by using auxiliary binary variables to characterize the complementarity conditions. We also show that this problem can be solved numerically efficiently.}
}

F. Stoican, I. Prodan, M. -I. Struc tu, and D. Popescu, “Geometrical interpretation on the coverage problems for a mobile agent,” in 2014 18th International Conference on System Theory, Control and Computing, ICSTCC 2014, 2014, pp. 785-790.
[Bibtex]

@inproceedings{WOS:000704338900129,
author = {Stoican,F. and Prodan,I. and Stru\c tu,M.-I. and Popescu,D.},
booktitle = {2014 18th {I}nternational {C}onference on {S}ystem {T}heory, {C}ontrol and {C}omputing, {ICSTCC} 2014},
cites = {0},
citews = {0},
doi = {10.1109/ICSTCC.2014.6982514},
eid = {2-s2.0-84929448955},
international = {1},
isbn = {9781479946013},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929448955&doi=10.1109%2fICSTCC.2014.6982514&partnerID=40&md5=fe5ae5178d6593e097ab56b2dcc2351b},
pages = {785-790},
proceedings = {2014 18th {I}nternational {C}onference on {S}ystem {T}heory, {C}ontrol and {C}omputing, {ICSTCC} 2014},
xdata={ieee},
title = {{G}eometrical interpretation on the coverage problems for a mobile agent},
vol = {},
worldcat = {0},
wos = {000704338900129},
year = {2014},
abstract = {This paper addresses the problem of fully covering an a priori known environment with fixed obstacles by a mobile agent. The blind region (i.e., the region hidden by the obstacles from the viewpoint of the agent) is described geometrically via both an exact and an over-approximation procedure. It is shown that the structure of this region depends on the hyperplane arrangement originating from the obstacles. This is further used to provide an mixed integer programming construction which allows to test if the feasible space is (or is not) fully covered by the agent(s). These novel results are examined over illustrative examples.}
}

F. Xu, V. Puig, C. Ocampo-Martinez, F. Stoican, and S. Olaru, “Closed-loop actuator-fault detection and isolation using invariant sets and tubes,” in 19th IFAC World Congress on International Federation of Automatic Control, IFAC 2014, 2014, pp. 8030-8035.
[Bibtex]

@inproceedings{eid:2-s2.0-84929773777,
author = {Xu,F. and Puig,V. and Ocampo-Martinez,C. and Stoican,F. and Olaru,S.},
booktitle = {19th {IFAC} {W}orld {C}ongress on {I}nternational {F}ederation of {A}utomatic {C}ontrol, {IFAC} 2014},
cites = {1},
citews = {1},
doi = {},
eid = {2-s2.0-84929773777},
international = {1},
isbn = {9783902823625},
issn = {1474-6670},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929773777&partnerID=40&md5=cb34ebc1f173db8d8570fa730c83e8e1},
pages = {8030-8035},
proceedings = {{IFAC} {P}roceedings {V}olumes ({IFAC}-{P}apers{O}nline)},
xdata={ifac},
title = {{C}losed-loop actuator-fault detection and isolation using invariant sets and tubes},
vol = {19},
worldcat = {0},
wos = {},
year = {2014},
doi={10.3182/20140824-6-ZA-1003.01653}
}

F. Xu, V. Puig, C. Ocampo-Martinez, F. Stoican, and S. Olaru, “Improved fault detection and isolation strategy using a bank of interval observers,” in 19th IFAC World Congress on International Federation of Automatic Control, IFAC 2014, 2014, pp. 8024-8029.
[Bibtex]

@inproceedings{eid:2-s2.0-84929815826,
IF = {},
author = {Xu,F. and Puig,V. and Ocampo-Martinez,C. and Stoican,F. and Olaru,S.},
booktitle = {19th {IFAC} {W}orld {C}ongress on {I}nternational {F}ederation of {A}utomatic {C}ontrol, {IFAC} 2014},
cites = {0},
citews = {0},
doi = {},
eid = {2-s2.0-84929815826},
international = {1},
isbn = {9783902823625},
issn = {1474-6670},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929815826&partnerID=40&md5=a941d1d23997cf7ed313a73d457ba788},
pages = {8024-8029},
proceedings = {{IFAC} {P}roceedings {V}olumes ({IFAC}-{P}apers{O}nline)},
xdata={ifac},
title = {{I}mproved fault detection and isolation strategy using a bank of interval observers},
vol = {19},
worldcat = {0},
wos = {},
year = {2014},
doi={10.3182/20140824-6-ZA-1003.01651}
}

2013

F. Xu, F. Stoican, V. Puig, C. Ocampo-Martinez, and S. Olaru, “On the relationship between interval observers and invariant sets in fault detection,” in 2nd International Conference on Control and Fault-Tolerant Systems, SysTol 2013, 2013, pp. 49-54.
[Bibtex]

@inproceedings{WOS:000331082600008,
IF = {0.25},
author = {Xu, Feng and Stoican, Florin and Puig, Vicenc and Ocampo-Martinez, Carlos and Olaru, Sorin},
booktitle = {2nd {I}nternational {C}onference on {C}ontrol and {F}ault-{T}olerant {S}ystems, {S}ys{T}ol 2013},
cites = {6},
citews = {7},
doi = {10.1109/SysTol.2013.6693849},
eid = {2-s2.0-84897677149},
international = {1},
isbn = {9781479928552},
issn = {2162-1195},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84897677149&doi=10.1109%2fSysTol.2013.6693849&partnerID=40&md5=57c1dfa77a49a6de03500f25d0dcde56},
pages = {49-54},
proceedings = {{C}onference on {C}ontrol and {F}ault-{T}olerant {S}ystems, {S}ys{T}ol},
xdata={ieee},
title = {{O}n the relationship between interval observers and invariant sets in fault detection},
vol = {},
worldcat = {0},
wos = {000331082600008},
year = {2013},
abstract = {In this paper, the relationship between two set-theoretic fault detection (FD) approaches, the interval observer-based and the invariant set-based approaches, is investigated. In FD, interval observers monitor the system dynamic behavior in real time and generates adaptive intervals for system outputs. Invariant sets focus more on steady state behavior of the system rather than the transient behavior. This paper discusses these two approaches, presents the relationship between them and compares them in the FD task. At the end, a numerical example is used to illustrate the relation between these two approaches.}
}

F. Xu, V. Puig, C. Ocampo-Martinez, F. Stoican, and S. Olaru, “Sensor-fault detection and isolation using interval observers,” in 2nd International Conference on Control and Fault-Tolerant Systems, SysTol 2013, 2013, pp. 55-60.
[Bibtex]

@inproceedings{WOS:000331082600009,
IF = {0.25},
author = {Xu, Feng and Puig, Vicenc and Ocampo-Martinez, Carlos and Stoican, Florin and Olaru, Sorin},
booktitle = {2nd {I}nternational {C}onference on {C}ontrol and {F}ault-{T}olerant {S}ystems, {S}ys{T}ol 2013},
cites = {1},
citews = {1},
doi = {10.1109/SysTol.2013.6693860},
eid = {2-s2.0-84897742081},
international = {1},
isbn = {9781479928552},
issn = {2162-1195},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84897742081&doi=10.1109%2fSysTol.2013.6693860&partnerID=40&md5=e55441b2a0b9f777a06cec8405a3788b},
pages = {55-60},
proceedings = {{C}onference on {C}ontrol and {F}ault-{T}olerant {S}ystems, {S}ys{T}ol},
xdata={ieee},
title = {{S}ensor-fault detection and isolation using interval observers},
vol = {},
worldcat = {0},
wos = {000331082600009},
year = {2013},
abstract = {This paper proposes an interval observer-based sensor fault detection and isolation (FDI) approach for the closed-loop systems. In this proposed approach, residuals are defined in such a way that their components are independent of each other at the time instant after fault occurrence, namely k(f) + 1, where k(f) denotes the fault occurrence time instant. In this way, it is guaranteed that at k(f) + 1 the changes in each component of the residuals are only related to the fault in the corresponding sensor. By detecting the threshold violation of the corresponding residual interval components, the proposed method can detect and isolate sensor faults at that time instant. At the end of this paper, a numerical example is used to present the effectiveness of the approach.}
}

F. Stoican, I. Prodan, and S. Olaru, “Hyperplane arrangements in mixed-integer programming techniques. Collision avoidance application with zonotopic sets,” in 12th European Control Conference, ECC 2013, 2013, pp. 3155-3160.
[Bibtex]

@inproceedings{WOS:000332509703092,
IF = {0.25},
author = {Stoican, Florin and Prodan, Ionela and Olaru, Sorin},
booktitle = {12th {E}uropean {C}ontrol {C}onference, {ECC} 2013},
cites = {6},
citews = {5},
doi = {10.23919/ECC.2013.6669645},
eid = {2-s2.0-84893235262},
international = {1},
isbn = {9783033039629},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893235262&partnerID=40&md5=f6bb69ec7df07d80cb88991685fb298f},
pages = {3155-3160},
proceedings = {2013 {E}uropean {C}ontrol {C}onference, {ECC} 2013},
xdata={ieee},
title = {{H}yperplane arrangements in mixed-integer programming techniques. {C}ollision avoidance application with zonotopic sets},
vol = {},
worldcat = {0},
wos = {000332509703092},
year = {2013},
abstract = {The current paper addresses the problem of minimizing the computational complexity of optimization problems with non-convex and possibly non-connected feasible region of polyhedral type. Using hyperplane arrangements and Mixed-Integer Programming we provide an efficient description of the feasible region in the solution space. Moreover, we exploit the geometric properties of the hyperplane arrangements and adapt this description in order to provide an efficient solution of the mixed-integer optimization problem. Furthermore, a zonotopic representation of the sets appearing in the problem is considered. The advantages of this representation are highlighted and exploited through proof of concepts illustrations as well as simulation results.}
}

F. Xu, F. Stoican, V. Puig, C. Ocampo-Martinez, and S. Olaru, “Fault detection and isolation based on the combination of a bank of interval observers and invariant sets,” in 2013 21st Mediterranean Conference on Control and Automation, MED 2013, 2013, pp. 807-813.
[Bibtex]

@inproceedings{WOS:000333245100127,
IF = {0.25},
author = {Xu, Feng and Stoican, Florin and Puig, Vicenc and Ocampo-Martinez, Carlos and Olaru, Sorin},
booktitle = {2013 21st {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2013},
cites = {2},
citews = {2},
doi = {10.1109/MED.2013.6608816},
eid = {2-s2.0-84885207795},
international = {1},
isbn = {9781479909971},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885207795&doi=10.1109%2fMED.2013.6608816&partnerID=40&md5=7332a6150a2cdce31d6b97ec8ee37f34},
pages = {807-813},
proceedings = {2013 21st {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2013 - {C}onference {P}roceedings},
xdata={ieee},
title = {{F}ault detection and isolation based on the combination of a bank of interval observers and invariant sets},
vol = {},
worldcat = {0},
wos = {000333245100127},
year = {2013},
abstract = {In this paper, a fault detection and isolation (FDI) approach using a bank of interval observers is developed. From the methodological point of view, a bank of interval observers is designed according to different dynamical models of the system under different modes (healthy or faulty). Each interval observer matches one system mode while all the interval observers monitor the system simultaneously. In order to guarantee FDI, a set of FDI conditions based on invariant set notions are established. These conditions ensure that the considered faults can be accurately isolated after a period of monitoring time. Finally, simulation results are used to present the effectiveness of the approach.}
}

M. Struc tu, F. Stoican, I. Prodan, D. Popescu, and S. Olaru, “A characterization of the relative positioning of mobile agents for full sensorial coverage in an augmented space with obstacles,” in 21st Mediterranean Conference on Control and Automation, MED 2013, 2013, pp. 936-941.
[Bibtex]

@inproceedings{WOS:000333245100145,
IF = {0.25},
author = {Stru\c tu, Mircea-Ionel and Stoican, Florin and Prodan, Ionela and Popescu, Dan and Olaru, Sorin},
booktitle = {21st {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2013},
cites = {2},
citews = {2},
doi = {10.1109/MED.2013.6608834},
eid = {2-s2.0-84885230747},
international = {1},
isbn = {9781479909971},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885230747&doi=10.1109%2fMED.2013.6608834&partnerID=40&md5=d6803897608055eb07d1553cd28a034c},
pages = {936-941},
proceedings = {2013 21st {M}editerranean {C}onference on {C}ontrol and {A}utomation, {MED} 2013 - {C}onference {P}roceedings},
xdata={ieee},
title = {{A} characterization of the relative positioning of mobile agents for full sensorial coverage in an augmented space with obstacles},
vol = {},
worldcat = {0},
wos = {000333245100145},
year = {2013},
abstract = {This paper addresses the coverage problem for a collection of agents and fixed obstacles (e. g., the "gallery" and the "patrolling" problems). A collection of sufficient conditions over the positions of the agents are provided such that whenever these are verified there is no "blind" region in the feasible space. These conditions are expressed by making use of hyperplane arrangements which lead to a mixed-integer formulation. Practical applications regarding the coverage problem inside an augmented space with obstacles validate these concepts and provide an efficient implementation (in terms of computing power).}
}

F. Stoican, M. Hovd, and S. Olaru, “Explicit invariant approximation of the mRPI set for LTI dynamics with zonotopic disturbances,” in 52nd IEEE Conference on Decision and Control, CDC 2013, 2013, pp. 3237-3242.
[Bibtex]

@inproceedings{WOS:000352223503108,
IF = {0.25},
author = {Stoican, Florin and Hovd, Morten and Olaru, Sorin},
booktitle = {52nd {IEEE} {C}onference on {D}ecision and {C}ontrol, {CDC} 2013},
cites = {2},
citews = {2},
doi = {10.1109/CDC.2013.6760377},
eid = {2-s2.0-84902322024},
international = {1},
isbn = {9781467357173},
issn = {0191-2216},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902322024&doi=10.1109%2fCDC.2013.6760377&partnerID=40&md5=4c19910904f5da415a55623f92285a09},
pages = {3237-3242},
proceedings = {{P}roceedings of the {IEEE} {C}onference on {D}ecision and {C}ontrol},
xdata={ieee},
title = {{E}xplicit invariant approximation of the m{RPI} set for {LTI} dynamics with zonotopic disturbances},
vol = {},
worldcat = {0},
wos = {000352223503108},
year = {2013},
abstract = {In this paper we provide a robust positive invariance (RPI) over-approximation of the minimal RPI (mRPI) set associated for linear dynamics with zonotopic disturbances. We prove that the RPI construction converges toward the mRPI set and its conservatism diminishes monotonically with respect to the complexity of the representation (a "tightness" coefficient is calculated a priori). The results are tested in illustrative examples.}
}

F. Xu, V. Puig, C. Ocampo-Martinez, F. Stoican, and S. Olaru, “Actuator-fault detection and isolation based on interval observers and invariant sets,” in 52nd IEEE Conference on Decision and Control, CDC 2013, 2013, pp. 4385-4390.
[Bibtex]

@inproceedings{WOS:000352223505003,
IF = {0.25},
author = {Xu, Feng and Puig, Vicenc and Ocampo-Martinez, Carlos and Stoican, Florin and Olaru, Sorin},
booktitle = {52nd {IEEE} {C}onference on {D}ecision and {C}ontrol, {CDC} 2013},
cites = {7},
citews = {6},
doi = {10.1109/CDC.2013.6760564},
eid = {2-s2.0-84902322023},
international = {1},
isbn = {9781467357173},
issn = {0191-2216},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902322023&doi=10.1109%2fCDC.2013.6760564&partnerID=40&md5=c35b445f6d9b42a7ba28deb54e30045f},
pages = {4385-4390},
proceedings = {{P}roceedings of the {IEEE} {C}onference on {D}ecision and {C}ontrol},
xdata={ieee},
title = {{A}ctuator-fault detection and isolation based on interval observers and invariant sets},
vol = {},
worldcat = {0},
wos = {000352223505003},
year = {2013},
abstract = {This paper proposes an interval observer-based actuator fault detection and isolation (FDI) approach. An interval observer matching the healthy system mode is designed to monitor the system. When the system is in different modes, state or output interval vectors predicted by the interval observer manifest different dynamical behaviors. To guarantee reliable FDI, a collection of invariant set-based FDI conditions are established. Under these conditions, actuator faults can be accurately detected and isolated during the transition between different modes. At the end, the effectiveness of this proposed approach is presented by using a numerical example.}
}

2012

N. Stanković, F. Stoican, S. Olaru, and S. -I. Niculescu, “Reference governor design with guarantees of detection for delay variation,” in 10th IFAC Workshop on Time Delay Systems, TDS-2012, 2012, pp. 67-72.
[Bibtex]

@inproceedings{eid:2-s2.0-84866126775,
IF = {},
author = {Stanković,N. and Stoican,F. and Olaru,S. and Niculescu,S.-I.},
booktitle = {10th {IFAC} {W}orkshop on {T}ime {D}elay {S}ystems, {TDS}-2012},
cites = {6},
citews = {3},
doi = {10.3182/20120622-3-US-4021.00055},
eid = {2-s2.0-84866126775},
international = {1},
isbn = {9783902823045},
issn = {1474-6670},
issue = {PART 1},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84866126775&doi=10.3182%2f20120622-3-US-4021.00055&partnerID=40&md5=2f03f8341c795dc77e68c6ef2c2ad4f7},
pages = {67-72},
proceedings = {{IFAC} {P}roceedings {V}olumes ({IFAC}-{P}apers{O}nline)},
xdata={ifac},
title = {{R}eference governor design with guarantees of detection for delay variation},
vol = {10},
worldcat = {0},
wos = {},
year = {2012}
}

F. Stoican and M. Hovd, “Some remarks upon the characteristics of the explicit representation of the MPC problem,” in 4th IFAC Conference on Nonlinear Model Predictive Control, NMPC’12, 2012, pp. 126-131.
[Bibtex]

@inproceedings{eid:2-s2.0-84867056750,
author = {Stoican,F. and Hovd,M.},
booktitle = {4th {IFAC} {C}onference on {N}onlinear {M}odel {P}redictive {C}ontrol, {NMPC}'12},
cites = {0},
citews = {0},
doi = {10.3182/20120823-5-NL-3013.00079},
eid = {2-s2.0-84867056750},
international = {1},
isbn = {9783902823076},
issn = {1474-6670},
issue = {PART 1},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84867056750&doi=10.3182%2f20120823-5-NL-3013.00079&partnerID=40&md5=4648d6ac12bd3fccda089014da6f3bda},
pages = {126-131},
proceedings = {{IFAC} {P}roceedings {V}olumes ({IFAC}-{P}apers{O}nline)},
xdata={ifac},
title = {{S}ome remarks upon the characteristics of the explicit representation of the {MPC} problem},
vol = {4},
worldcat = {0},
wos = {},
year = {2012}
}

G. Marafioti, F. Stoican, R. R. Bitmead, and M. Hovd, “Persistently exciting model predictive control for SISO systems,” in 4th IFAC Conference on Nonlinear Model Predictive Control, NMPC’12, 2012, pp. 448-453.
[Bibtex]

@inproceedings{eid:2-s2.0-84867067744,
author = {Marafioti,G. and Stoican,F. and Bitmead,R.R. and Hovd,M.},
booktitle = {4th {IFAC} {C}onference on {N}onlinear {M}odel {P}redictive {C}ontrol, {NMPC}'12},
cites = {5},
citews = {2},
doi = {10.3182/20120823-5-NL-3013.00054},
eid = {2-s2.0-84867067744},
international = {1},
isbn = {9783902823076},
issn = {1474-6670},
issue = {PART 1},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84867067744&doi=10.3182%2f20120823-5-NL-3013.00054&partnerID=40&md5=abce00b3c3bd0855d8d4481447d73baa},
pages = {448-453},
proceedings = {{IFAC} {P}roceedings {V}olumes ({IFAC}-{P}apers{O}nline)},
xdata={ifac},
qcat = {},
qtop = {-1},
title = {{P}ersistently exciting model predictive control for {SISO} systems},
vol = {4},
worldcat = {0},
wos = {},
year = {2012}
}

F. Stoican and M. Hovd, “Efficient solution of a QP optimization problem with zonotopic constraints,” in 2012 IEEE International Conference on Control Applications, CCA 2012, 2012, pp. 457-462.
[Bibtex]

@inproceedings{WOS:000320336200062,
IF = {0.25},
author = {Stoican, Florin and Hovd, Morten},
booktitle = {2012 {IEEE} {I}nternational {C}onference on {C}ontrol {A}pplications, {CCA} 2012},
cites = {0},
citews = {0},
doi = {10.1109/CCA.2012.6402730},
eid = {2-s2.0-84873161973},
international = {1},
isbn = {9781467345033},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84873161973&doi=10.1109%2fCCA.2012.6402730&partnerID=40&md5=ab7bbe31b726b537ff62a2120e3040a6},
pages = {457-462},
proceedings = {{P}roceedings of the {IEEE} {I}nternational {C}onference on {C}ontrol {A}pplications},
xdata={ieee},
title = {{E}fficient solution of a {QP} optimization problem with zonotopic constraints},
vol = {},
worldcat = {0},
wos = {000320336200062},
year = {2012},
abstract = {In this paper we analyze the advantages of describing the constraint set of a constrained optimization problem by an (inner-approximating) zonotope. We compare this with the usual polytopic description and note that by using the generator description characterizing zonotopes we can exploit their special structure in order to obtain a simpler formulation of the optimization problem. We test the results on a typical MPC setting and observe the improvements.}
}

2011

F. Stoican, C. F. Răduinea, and S. Olaru, “Adaptation of set theoretic methods to the fault detection of a wind turbine benchmark,” in 18th ifac world congress, 2011, pp. 8322-8327.
[Bibtex]

@inproceedings{eid:2-s2.0-84864613111,
IF = {},
author = {Stoican,F. and Răduinea,C.F. and Olaru,S.},
booktitle = {18th IFAC World Congress},
cites = {23},
citews = {16},
doi = {10.3182/20110828-6-IT-1002.01842},
eid = {2-s2.0-84864613111},
international = {1},
isbn = {9783902661937},
issn = {1474-6670},
issue = {1 PART 1},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84864613111&doi=10.3182%2f20110828-6-IT-1002.01842&partnerID=40&md5=fa9cdf90040be794b9a85d76b22e6997},
pages = {8322-8327},
proceedings = {18th IFAC World Congress},
xdata = {ifac},
title = {{A}daptation of set theoretic methods to the fault detection of a wind turbine benchmark},
vol = {44},
worldcat = {0},
wos = {},
year = {2011}
}

F. Stoican, S. Olaru, J. A. DeDoná, and M. M. Seron, “Zonotopic ultimate bounds for linear systems with bounded disturbances,” in 18th ifac world congress, 2011, pp. 9224-9229.
[Bibtex]

@inproceedings{eid:2-s2.0-84866769502,
author = {Stoican,F. and Olaru,S. and DeDoná,J.A. and Seron,M.M.},
booktitle = {18th IFAC World Congress},
cites = {6},
citews = {3},
doi = {10.3182/20110828-6-IT-1002.03247},
eid = {2-s2.0-84866769502},
international = {1},
isbn = {9783902661937},
issn = {1474-6670},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84866769502&doi=10.3182%2f20110828-6-IT-1002.03247&partnerID=40&md5=5cf30de62c4f5ce39d088b285e60a1ed},
pages = {9224-9229},
proceedings = {18th IFAC World Congress},
xdata={ifac},
title = {{Z}onotopic ultimate bounds for linear systems with bounded disturbances},
vol = {44},
worldcat = {0},
wos = {},
year = {2011}
}

F. Stoican, I. Prodan, and S. Olaru, “On the hyperplanes arrangements in mixed-integer techniques,” in 2011 American Control Conference, ACC 2011, 2011, pp. 1898-1903.
[Bibtex]

@inproceedings{WOS:000295376002086,
IF = {0.25},
author = {Stoican, Florin and Prodan, Ionela and Olaru, Sorin},
booktitle = {2011 {A}merican {C}ontrol {C}onference, {ACC} 2011},
cites = {5},
citews = {2},
doi = {10.1109/ACC.2011.5990908},
eid = {2-s2.0-80053161211},
international = {1},
isbn = {9781457700804},
issn = {0743-1619},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80053161211&partnerID=40&md5=a3106ee944b9953a718d8789518e1cd2},
pages = {1898-1903},
proceedings = {{P}roceedings of the {A}merican {C}ontrol {C}onference},
xdata={ieee},
title = {{O}n the hyperplanes arrangements in mixed-integer techniques},
vol = {},
worldcat = {0},
wos = {000295376002086},
year = {2011},
abstract = {This paper is concerned with the improved constraints handling in mixed-integer optimization problems. The novel element is the reduction of the number of binary variables used for expressing the complement of a convex(polytopic) region. As a generalization, the problem of representing the complement of a possibly non-connected union of such convex sets is detailed. In order to illustrate the benefits of the proposed improvements, a practical implementation, the problem of obstacle avoidance using receding horizon optimization techniques is considered.}
}

F. Stoican, N. M. Enache, and S. Olaru, “A lane control mechanism with fault tolerant control capabilities,” in 2011 50th IEEE Conference on Decision and Control and European Control Conference, CDC-ECC 2011, 2011, pp. 2245-2250.
[Bibtex]

@inproceedings{WOS:000303506202138,
IF = {0.25},
author = {Stoican, Florin and Enache, Nicoleta Minoiu and Olaru, Sorin},
booktitle = {2011 50th {IEEE} {C}onference on {D}ecision and {C}ontrol and {E}uropean {C}ontrol {C}onference, {CDC}-{ECC} 2011},
cites = {0},
citews = {0},
doi = {10.1109/CDC.2011.6161317},
eid = {2-s2.0-84860652919},
international = {1},
isbn = {9781612848006},
issn = {0191-2216},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84860652919&doi=10.1109%2fCDC.2011.6161317&partnerID=40&md5=56bfb0f7c7a7ca5621bfdae7f8c2f901},
pages = {2245-2250},
proceedings = {{P}roceedings of the {IEEE} {C}onference on {D}ecision and {C}ontrol},
xdata={ieee},
title = {{A} lane control mechanism with fault tolerant control capabilities},
vol = {},
worldcat = {0},
wos = {000303506202138},
year = {2011},
abstract = {The paper discusses the problem of lane departure avoidance for a vehicle. A corrective mechanism imposes its control action whenever the vehicle is no longer inside a nominal region centered along the middle of the lane. Set theoretic methods are used in order to design this control action and to guarantee global stability. Additionally, for the same lane departure avoidance system, a fault tolerant control mechanism is proposed in order to discard faulty sensors in a redundant measurement setting, thus guaranteeing stability even in the presence of faults.}
}

F. Stoican, I. Prodan, and S. Olaru, “Enhancements on the hyperplane arrangements in mixed integer techniques,” in 2011 50th IEEE Conference on Decision and Control and European Control Conference, CDC-ECC 2011, 2011, pp. 3986-3991.
[Bibtex]

@inproceedings{WOS:000303506204097,
IF = {0.25},
author = {Stoican, Florin and Prodan, Ionela and Olaru, Sorin},
booktitle = {2011 50th {IEEE} {C}onference on {D}ecision and {C}ontrol and {E}uropean {C}ontrol {C}onference, {CDC}-{ECC} 2011},
cites = {2},
citews = {1},
doi = {10.1109/CDC.2011.6161361},
eid = {2-s2.0-84860687872},
international = {1},
isbn = {9781612848006},
issn = {0191-2216},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84860687872&doi=10.1109%2fCDC.2011.6161361&partnerID=40&md5=391285a44251439a6176db63be4749e0},
pages = {3986-3991},
proceedings = {{P}roceedings of the {IEEE} {C}onference on {D}ecision and {C}ontrol},
xdata={ieee},
title = {{E}nhancements on the hyperplane arrangements in mixed integer techniques},
vol = {},
worldcat = {0},
wos = {000303506204097},
year = {2011},
abstract = {The current paper addresses the problem of optimizing a cost function over a non-convex and possibly non-connected feasible region. A classical approach for solving this type of optimization problem is based on Mixed integer technique. The exponential complexity as a function of the number of binary variables used in the problem formulation highlights the importance of reducing them. Previous work which minimize the number of binary variables is revisited and enhanced. Practical limitations of the procedure are discussed and a typical control application, the control of Multi-Agent Systems is exemplified.}
}

H. N. Nguyen, S. Olaru, and F. Stoican, “On maximal robustly positively invariant sets,” in 8th International Conference on Informatics in Control, Automation and Robotics, ICINCO 2011, 2011, pp. 300-305.
[Bibtex]

@inproceedings{WOS:000392351500050,
IF = {0.25},
author = {Hoai Nam Nguyen and Olaru, Sorin and Stoican, Florin},
booktitle = {8th {I}nternational {C}onference on {I}nformatics in {C}ontrol, {A}utomation and {R}obotics, {ICINCO} 2011},
cites = {0},
citews = {0},
doi = {},
eid = {2-s2.0-80052564123},
international = {1},
isbn = {9789898425744},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80052564123&partnerID=40&md5=a8efb6f83f3d88abb4f7e9d40aba5351},
pages = {300-305},
proceedings = {{ICINCO} 2011 - {P}roceedings of the 8th {I}nternational {C}onference on {I}nformatics in {C}ontrol, {A}utomation and {R}obotics},
publisher = {{INSTICC}-{INST}},
qcat = {},
qtop = {-1},
title = {{O}n maximal robustly positively invariant sets},
vol = {1},
worldcat = {0},
wos = {000392351500050},
year = {2011},
abstract = {This paper addresses the problem of computing maximal robustly positively invariant sets for discrete-time linear time-invariant systems with disturbance inputs. It is assumed that the disturbance is unknown, additive, but bounded. The main contribution is the determination of bound of the number of steps in the iterative construction of the maximal invariant sets.}
}

2010

F. Stoican and S. Olaru, “Fault tolerant positioning system for a multisensor control scheme,” in 2010 IEEE International Conference on Control Applications, CCA 2010, 2010, pp. 1051-1056.
[Bibtex]

@inproceedings{WOS:000286943900232,
IF = {0.25},
author = {Stoican, F. and Olaru, S.},
booktitle = {2010 {IEEE} {I}nternational {C}onference on {C}ontrol {A}pplications, {CCA} 2010},
cites = {0},
citews = {0},
doi = {10.1109/CCA.2010.5611187},
eid = {2-s2.0-78649399354},
international = {1},
isbn = {9781424453627},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-78649399354&doi=10.1109%2fCCA.2010.5611187&partnerID=40&md5=1a8ca097041059d2a81f870a2372bbbd},
pages = {1051-1056},
proceedings = {{P}roceedings of the {IEEE} {I}nternational {C}onference on {C}ontrol {A}pplications},
xdata={ieee},
qcat = {},
qtop = {-1},
title = {{F}ault tolerant positioning system for a multisensor control scheme},
vol = {},
worldcat = {0},
wos = {000286943900232},
year = {2010},
abstract = {The present paper deals with a fault tolerant control scheme for a multisensor plant based on set theoretic methods under the assumption of bounded exogenous signals. Robust guarantees for the global stability of the system and the separability and identification of abrupt faults occurring in the sensor outputs are provided. The methodology is exemplified on a positioning system showing improved detection and isolation capabilities even for reference signals passing with oscillations around the position corresponding to faulty functioning of the sensors.}
}

F. Stoican, S. Olaru, J. A. De Dona, and M. M. Seron, “Improvements in the sensor recovery mechanism for a multisensor control scheme,” in 2010 American Control Conference, ACC 2010, 2010, pp. 4052-4057.
[Bibtex]

@inproceedings{WOS:000287187904073,
IF = {0.25},
author = {Stoican, F. and Olaru, S. and De Dona, Jose A. and Seron, Maria M.},
booktitle = {2010 {A}merican {C}ontrol {C}onference, {ACC} 2010},
cites = {0},
citews = {0},
doi = {10.1109/ACC.2010.5530512},
eid = {2-s2.0-77957806550},
international = {1},
isbn = {9781424474264},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-77957806550&partnerID=40&md5=c66e03e8c44a7b4580da5267769a4d73},
pages = {4052-4057},
proceedings = {{P}roceedings of the 2010 {A}merican {C}ontrol {C}onference, {ACC} 2010},
xdata={ieee},
title = {{I}mprovements in the sensor recovery mechanism for a multisensor control scheme},
vol = {},
worldcat = {0},
wos = {000287187904073},
year = {2010},
abstract = {This paper deals with a multisensor scheme based on set theoretic principles, whereby different invariant sets that characterize healthy and faulty functioning of system components are computed offline. Such sets allow to partition the ensemble of sensors into 'healthy', 'faulty' and 'under recovery' subclasses. Fault detection and isolation consists of online set-membership verifications with low computational complexity. Sensors that are deemed healthy are utilized in the computation of the feedback control law, while sensors that are deemed 'faulty' or 'under recovery' are prevented from participating in the feedback control action. The main focus of this paper is on the reintegration of 'under recovery' sensors, that is to say, the transition of sensors from the 'under recovery' to the 'healthy' sensor subclass. This transition, in contrast to all other possible transitions, is particularly difficult to evaluate since it involves set membership conditions based on unmeasurable quantities. This difficulty is circumvented by resorting to necessary and sufficient conditions for the recognition of recovery, which are based exclusively upon measurable quantities. The interplay between the necessary conditions and the sufficient conditions, together with the particular system structure and fault detection mechanism, allows to obtain further important improvements in the recovery procedure in terms of transient times and sensitivity to the topology of the invariant sets.}
}

F. Stoican, S. Olaru, M. M. Seron, and J. A. De Dona, “A fault tolerant control scheme based on sensor-actuation channel switching and dwell time,” in 2010 49th IEEE Conference on Decision and Control, CDC 2010, 2010, pp. 756-761.
[Bibtex]

@inproceedings{WOS:000295049101001,
IF = {0.25},
author = {Stoican, F. and Olaru, S. and Seron, Maria M. and De Dona, Jose A.},
booktitle = {2010 49th {IEEE} {C}onference on {D}ecision and {C}ontrol, {CDC} 2010},
cites = {0},
citews = {0},
doi = {10.1109/CDC.2010.5718146},
eid = {2-s2.0-79953130241},
international = {1},
isbn = {9781424477456},
issn = {0191-2216},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79953130241&doi=10.1109%2fCDC.2010.5718146&partnerID=40&md5=b64e0421245a986bac659268a0f38821},
pages = {756-761},
proceedings = {{P}roceedings of the {IEEE} {C}onference on {D}ecision and {C}ontrol},
xdata={ieee},
title = {{A} fault tolerant control scheme based on sensor-actuation channel switching and dwell time},
vol = {},
worldcat = {0},
wos = {000295049101001},
year = {2010},
abstract = {The present paper deals with a switching control scheme for a plant with multiple estimator-controller-actuator pairs. The scheme has to deal with specific problems originated by the switching between the different feedback loops and accommodate to faults in the observation channels (sensors outputs). The main contribution is a fault tolerant switching scheme with stability guarantees assured by a pre-imposed dwell-time. The detection and the fault tolerance capabilities are assured through set separation for the residual signals corresponding to healthy and faulty functioning. Another contribution of the paper resides in a recovery technique for faulty sensors which makes use of a virtual sensor whose estimation, based on an optimization procedure, minimizes recovery time.}
}

F. Stoican, S. Olaru, and G. Bitsoris, “A fault detection scheme based on controlled invariant sets for multisensor systems,” in 1st Conference on Control and Fault-Tolerant Systems, SysTol’10, 2010, pp. 468-473.
[Bibtex]

@inproceedings{WOS:000416069400077,
IF = {0.25},
author = {Stoican, F. and Olaru, S. and Bitsoris, G.},
booktitle = {1st {C}onference on {C}ontrol and {F}ault-{T}olerant {S}ystems, {S}ys{T}ol'10},
cites = {3},
citews = {2},
doi = {10.1109/SYSTOL.2010.5675958},
eid = {2-s2.0-78751669594},
international = {1},
isbn = {9781424481545},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-78751669594&doi=10.1109%2fSYSTOL.2010.5675958&partnerID=40&md5=37fdbf5e0e4ff525874eb8d7089b84cc},
pages = {468-473},
proceedings = {{C}onference on {C}ontrol and {F}ault-{T}olerant {S}ystems, {S}ys{T}ol'10 - {F}inal {P}rogram and {B}ook of {A}bstracts},
xdata={ieee},
title = {{A} fault detection scheme based on controlled invariant sets for multisensor systems},
vol = {},
worldcat = {0},
wos = {000416069400077},
year = {2010},
abstract = {The present paper uses set theoretic methods for the design of a fault tolerant control scheme in the case of a multisensor application. The basic principle is the separation of invariant sets for the estimations of the state and tracking error under healthy and faulty functioning. The fault scenario is based on abrupt changes of the observation equations. The main contribution is the introduction of controlled invariant sets in the fault detection mechanism. The control action is chosen so that the closed loop invariance is assured for a candidate region which accounts for the bounds on the exogenous signals (additive disturbances, noise and reference/set-points).}
}

F. Stoican, S. Olaru, M. M. Seron, and J. A. De Dona, “Reference governor for tracking with fault detection capabilities,” in 1st Conference on Control and Fault-Tolerant Systems, SysTol’10, 2010, pp. 546-551.
[Bibtex]

@inproceedings{WOS:000416069400089,
IF = {0.25},
author = {Stoican, F. and Olaru, S. and Seron, M. M. and De Dona, J. A.},
booktitle = {1st {C}onference on {C}ontrol and {F}ault-{T}olerant {S}ystems, {S}ys{T}ol'10},
cites = {1},
citews = {0},
doi = {10.1109/SYSTOL.2010.5675962},
eid = {2-s2.0-78751667497},
international = {1},
isbn = {9781424481545},
issn = {-},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-78751667497&doi=10.1109%2fSYSTOL.2010.5675962&partnerID=40&md5=c15dd3f8db914a2244efbfc2244a5f69},
pages = {546-551},
proceedings = {{C}onference on {C}ontrol and {F}ault-{T}olerant {S}ystems, {S}ys{T}ol'10 - {F}inal {P}rogram and {B}ook of {A}bstracts},
xdata={ieee},
title = {{R}eference governor for tracking with fault detection capabilities},
vol = {},
worldcat = {0},
wos = {000416069400089},
year = {2010},
abstract = {This paper presents a fault tolerant multisensor strategy for feedback control of a class of nonlinear systems upon a geometrical approach. A key point to ensure fault tolerance is the separation between healthy and faulty closed-loop behavior. Here we achieve this through set theoretic operations upon sets describing the healthy/faulty behavior of the system. The results rely both on an appropriate choice for the exogenous signals and on fixed point conditions for a nonlinear mapping which describes the gap between the nonlinear system and a linearized model in the functioning interval. A reference governor is employed such that, under a receding horizon technique, only feasible exogenous signals are provided to the system.}
}

2009

S. Olaru, F. Stoican, J. A. DeDoná, and M. M. Seron, “Necessary and sufficient conditions for sensor recovery in a multisensor control scheme,” in 7th IFAC International Symposium on Fault Detection, Supervision and Safety of Technical Systems, SAFEPROCESS’09, 2009, pp. 977-982.
[Bibtex]

@inproceedings{eid:2-s2.0-77957793634,
IF = {},
author = {Olaru,S. and Stoican,F. and DeDoná,J.A. and Seron,M.M.},
booktitle = {7th {IFAC} {I}nternational {S}ymposium on {F}ault {D}etection, {S}upervision and {S}afety of {T}echnical {S}ystems, {SAFEPROCESS}'09},
cites = {3},
citews = {2},
doi = {10.3182/20090630-4-ES-2003.0388},
eid = {2-s2.0-77957793634},
international = {1},
isbn = {9783902661463},
issn = {1474-6670},
issue = {},
link_scopus = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-77957793634&doi=10.3182%2f20090630-4-ES-2003.0388&partnerID=40&md5=ffd6a0ec513d92be65d669ddfa69636c},
pages = {977-982},
proceedings = {{IFAC} {P}roceedings {V}olumes ({IFAC}-{P}apers{O}nline)},
xdata={ifac},
qcat = {},
qtop = {-1},
title = {{N}ecessary and sufficient conditions for sensor recovery in a multisensor control scheme},
vol = {},
worldcat = {0},
wos = {},
year = {2009}
}

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