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第26届中国控制与决策会议

作者： Liu Bin Sun Jiuqiang Cui Yangyang Li Wei School of Electrical and Information Engineering Northeast Petroleum University Department of Automatic Control and Systems Engineering University of Sheffield

In this article, we provide a numerical method for the mixed H2/H∞ synthesis minimizing the H2 norm of one transfer function while imposing restriction on H∞ norm of the other transfer function. The mixed H2/H∞ robust controller with degree constraint can be designed by solving the nonlinear equations, where a group-preserving scheme is introduced. Three examples are used to investigate the numerical characteristics of new proposed method, also illustrating the effective of the proposed technique.

关键词： mixed H2/H∞ control,degree constraint,group-preserving scheme,Runge-Kutta method

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Computer-aided diagnosis of abdominal aortic aneurysm after endovascular repair using active learning segmentation and texture analysis

Computer-aided diagnosis of abdominal aortic aneurysm after ...

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13th Mediterranean Conference on Medical and Biological engineering and Computing 2013, MEDICON 2013

作者： García, G. Maiora, J. Tapia, A. Graña, M. De Blas, M. Systems Engineering and Automatic Control Department -EUP University of the Basque Country San Sebastián Spain Electronic Technology Department -EUP University of the Basque Country San Sebastián Spain Computational Intelligence Group University of the Basque Country San Sebastián Spain Radiology Department Donostia Hospital San Sebastián Spain

ISBN: (纸本)9783319008455

Endovascular repair is a minimal invasive alternative to open surgical therapy. From a long term perspective, complications such as prostheses displacement or leaks inside the aneurysm sac (endoleaks) could appear influencing the evolution of treatment. The objective of this work is to develop a Computer-Aided Diagnosis system (CAD) for an automated classification of EndoVascular Aneurysm Repair (EVAR) progression from Computed Tomography Angiography (CTA) images. The CAD system is based on the extraction of texture features from segmented thrombus aneurysm samples and a posterior classification. Image segmentation is produced by an interactive Active Learning procedure based on Random Forest (RF) classification. An initial set of labeled points are required to start training an RF. The human operator is presented with the most uncertain unlabeled voxels to select some of them for inclusion in the training set, retraining the RF classifier. Three texture-analysis methods such as the gray level co-occurrence matrix (GLCM), the gray level run length matrix (GLRLM), and the gray level difference method (GLDM), were applied to each ROI to obtain texture features. Classification of the ROI is carried out by an ensemble of SVM classifiers (ECs). The final decision is based on the application of a voting scheme across the outputs of the individual SVMs. The performance of the classifier was evaluated using 10-fold cross validation and the average of accuracy (93.84% ± 0.29), sensitivity (94.72 ± 0.23), and specificity (91.48 ± 0.35) results. © Springer International Publishing Switzerland 2014.

关键词： Repair

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Smart adaptive control of a solar collector field

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IFAC Proceedings Volumes 2014年第3期47卷 2564-2569页

作者： Esko K. Juuso Luis J. Yebra Control Engineering Laboratory Department of Process and Environmental Engineering FI-90014 University of Oulu Finland CIEMAT Plataforma Solar de Almería Automatic Control Group Crta. de Senés s/n 04200 Tabernas Almería Spain

Solar power plants collect available thermal energy in a usable form at the desired temperature range. Efficient operation requires a fast start-up and reliable operation in varying cloudy conditions without unnecessary shutdowns and start-ups. Fast and well damped linguistic equation (LE) controllers have been tested in Spain at a collector field, which uses parabolic-trough collectors to supply thermal energy in form of hot oil to an electricity generation system or a multi-effect desalination plant. control is achieved by means of varying the flow pumped through the pipes in the field during the operation. The nights and the heavy cloud periods need to come up with the storage. The smart LE controllers extend the operation to varying cloudy conditions and handle efficiently disturbances in energy demand. The predefined model-based adaptation techniques are combined with special features when needed. The intelligent state indicators react well to the changing operating conditions and can be used in smart working point control to further improve the operation in connection with the other energy sources. The controller reacts efficiently on the setpoint changes, clouds and load disturbances. The predictive braking action allows fast changes in control actions. The setpoint is achieved accurately with the new asymmetrical action. The working point can be chosen in a way which improves the efficiency of the energy collection.

关键词： Solar energy intelligent control nonlinear systems adaptation optimisation linguistic equations modelling simulation

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A usability study case of a vision-based gesture interface 14

A usability study case of a vision-based gesture interface

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15th International Conference on Human Computer Interaction, INTERACCION 2014

作者： Ponsa, Pere Urbina, Carlos Manresa-Yee, Cristina Vilanova, Ramon Automatic Control Department Universitat Politècnica Catalunya Av. Víctor Balaguer 1 Vilanova i la Geltrú08800 Spain Computer Graphics Computer Vision and AI Group University of Balearic Islands Crta. Valldemossa km 7.5 Palma07122 Spain Engineering Systems and Telecommunications Department School of Engineering Universitat Autònoma Barcelona Bellaterra08193 Spain

ISBN: (纸本)9781450328807

Gestural interaction uses human gestures to interact with an interactive system. Many efforts have been done to define gestures and facilitate a comfortable and natural way to interact. In this paper an experimental session in laboratory conditions is presented aiming at analyzing the usability factors of a visionbased gestural interface. Based on the results, recommendations are given to modify the configuration of some parameters between the human, the Kinect sensor, Kinect Mouse and the virtual visit of a museum with the final aim to improve the overall interaction. Copyright 2014 ACM.

关键词： gestures usability Vision-based interfaces evaluation

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Embedding of Nonlinear systems in a Linear Parameter-Varying Representation

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IFAC Proceedings Volumes 2014年第3期47卷 6907-6913页

作者： Hossam S. Abbas Roland Tóth Mihály Petreczky Nader Meskin Javad Mohammadpour Department of Electrical Engineering College of Engineering Qatar University PO Box 2713 Doha Qatar Electrical Engineering Department Faculty of Engineering Assiut University Assiut Egypt Control Systems Group Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Department of Computer Science and Automatic Control Ecole des Mines de Douai 59508 Douai France Intelligent Control Systems Lab College of Engineering The University of Georgia Athens GA 30602 USA

This paper introduces a systematic approach to synthesize linear parameter-varying (LPV) representations of nonlinear (NL) systems which are originally defined by control affine state-space representations. The conversion approach results in LPV state-space representations in the observable canonical form. Based on the relative degree concept of NL systems, the states of a given NL representation are transformed to new coordinates that provide its normal form. In the SISO case, all nonlinearities of the original system are embedded in one NL function which is factorized to construct the LPV form. An algorithms is proposed for this purpose. The resulting transformation yields an LPV model where the scheduling parameter depends on the derivatives of the inputs and outputs of the system. In addition, if the states of the NL model can be measured or estimated, then the procedure can be modified to provide LPV models scheduled by these states. Examples are included for illustration.

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Analysis options for high-throughput sequencing in miRNA expression profiling

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BMC Research Notes 2014年第1期7卷 1-12页

作者： Stokowy, Tomasz Eszlinger, Markus Świerniak, Michał Fujarewicz, Krzysztof Jarza̧b, Barbara Paschke, Ralf Krohn, Knut Systems Engineering Group Institute of Automatic Control Silesian University of Technology Gliwice Poland Nuclear Medicine and Endocrine Oncology Department Maria Sklodowska-Curie Memorial Cancer Center Institute of Oncology Gliwice Poland Division of Endocrinology and Nephrology University of Leipzig Leipzig Germany Genomic Medicine Department of General Transplant and Liver Surgery Medical University of Warsaw Warsaw Poland Interdisciplinary Center for Clinical Research (IZKF) University of Leipzig 04103 Leipzig Liebigstr. 21 Germany

Background: Recently high-throughput sequencing (HTS) using next generation sequencing techniques became useful in digital gene expression *** study introduces analysis options for HTS data based on mapping to miRBase or counting and grouping of identical sequence reads. Those approaches allow a hypothesis free detection of miRNA differential expression. Methods. We compare our results to microarray and qPCR data from one set of RNA samples. We use Illumina platforms for microarray analysis and miRNA sequencing of 20 samples from benign follicular thyroid adenoma and malignant follicular thyroid carcinoma. Furthermore, we use three strategies for HTS data analysis to evaluate miRNA biomarkers for malignant versus benign follicular thyroid tumors. Results: High correlation of qPCR and HTS data was observed for the proposed analysis methods. However, qPCR is limited in the differential detection of miRNA isoforms. Moreover, we illustrate a much broader dynamic range of HTS compared to microarrays for small RNA studies. Finally, our data confirm hsa-miR-197-3p, hsa-miR-221-3p, hsa-miR-222-3p and both hsa-miR-144-3p and hsa-miR-144-5p as potential follicular thyroid cancer biomarkers. Conclusions: Compared to microarrays HTS provides a global profile of miRNA expression with higher specificity and in more detail. Summarizing of HTS reads as isoform groups (analysis pipeline B) or according to functional criteria (seed analysis pipeline C), which better correlates to results of qPCR are promising new options for HTS analysis. Finally, data opens future miRNA research perspectives for HTS and indicates that qPCR might be limited in validating HTS data in detail. © 2014 Stokowy et al.;licensee BioMed Central Ltd.

关键词： Follicular thyroid cancer High-throughput sequencing Microarrays miRNA expression

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Coordination of Actuators for an A-double Heavy Vehicle Combination using control Allocation

Coordination of Actuators for an A-double Heavy Vehicle Comb...

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17th International IEEE Conference on Intelligent Transportation systems & The Asia-Pacific Council on systems engineering Conference 2014

作者： Karin Uhlén Per Nyman Johan Eklv Leo Laine Maliheh Sadeghi Kati Jonas Fredriksson Volvo Group Trucks Technology SE-405 08 GteborgSweden Department of Signals and Systems Div.of Automatic ControlAutomation and MechatronicsChalmers University of Technology

This paper shows how actuator coordination,based on control allocation,can be used in the motion control system for long articulated heavy *** of a control allocation structure is one way to handle an over-actuated system,which is a system where there are more motion actuators than controlled *** A-double combination is in focus for the control allocation design,which is based on vehicle modelling using the Lagrange *** control structure is tested in a simulation environment and evaluated by two test *** the selected configuration with 31 actuators,the control allocation method coordinates the desired motion for both large and small steer and articulation *** proposed control structure is shown to be convenient when the vehicle configuration,for example the number of actuators in the combination,is changed.

关键词： long heavy vehicles,control allocation,motion control system,over-actuated system,low and high speed manoeuvres

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A note on improvement of adaptive observer robustness 19

A note on improvement of adaptive observer robustness

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Efimov, Denis Edwards, Christopher Zolghadri, Ali Non-A Team Inria Lille Parc Scientifique de la Haute Borne 40 Avenue Halley Villeneuve d'Ascq59650 France College of Engineering Mathematics and Physical Sciences University of Exeter ExeterEX4 4QF United Kingdom University of Bordeaux IMS-Lab. Automatic Control Group 351 Cours de la Libération Talence33405 France Department of Control Systems and Informatics National Research University ITMO 49 Kronverkskiy Av. Saint-Petersburg197101 Russia

ISBN: (纸本)9783902823625

In this paper the problem of adaptive observer design in the presence of disturbances is studied, and an augmented adaptive observer is proposed. First, the H∞ gain of a conventional adaptive observer is estimated, which characterizes the effect of disturbances on output errors. Next, it is shown that if the disturbance is "matched" in the plant equations, then it is possible to introduce additional sliding-mode feedback, dependent on the plant output, improving the accuracy of observation. Simulation results confirm the improvement. © IFAC.

关键词： Automation

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Parametric model order reduction by sparse-grid-based interpolation on matrix manifolds for multidimensional parameter spaces

Parametric model order reduction by sparse-grid-based interp...

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European control Conference (ECC)

作者： Matthias Geuss Daniel Butnaru Benjamin Peherstorfer Hans-Joachim Bungartz Boris Lohmann Department of Mechanical Engineering Institute of Automatic Control Technische Universität München Garching Germany Department of Informatics Scientific Computing Group Technische Universität München Garching Germany

ISBN: (纸本)9781479947287

Current methods of parametric model order reduction based on the interpolation of system matrices are extended in this paper to an efficient method to tackle multidimensional parameter spaces. In order to overcome the curse of dimensionality the technique of sparse grids with multiple outputs is applied. The procedure is divided into an offline and online phase. In the offline phase the weighting matrices to the corresponding basis functions are computed with respect to generalized coordinates and appropriate matrix manifolds. The number of levels for the sparse grid can be set manually or determined by a tolerance criterion. The calculation of the interpolated system takes place during the online phase by evaluating the interpolant. The performance of the proposed method is demonstrated by two numerical examples.

关键词： Interpolation Sparse matrices Vectors Accuracy Manifolds Aerospace electronics

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Fault tolerant predictive control for multi-agent dynamical systems: Formation reconfiguration using set-theoretic approach

Fault tolerant predictive control for multi-agent dynamical ...

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International Conference on control, Decision and Information Technologies (CoDIT)

作者： M.T. Nguyen C. Stoica Maniu S. Olaru A. Grancharova SUPELEC Systems Sciences (E3S) - Automatic Control Department Gif-sur-Yvette France Bulgarian Academy of Sciences Institute of System Engineering and Robotics Sofia Bulgaria

This paper deals with the task assignment problem, which represents a major issue in dynamical formation control. The formation is defined in terms of a group of homogeneous dynamical agents. The position of each agent in the formation is predetermined by pre-imposing the distance between each pair of agents. Recently by using set-theoretic methods, the task assignment has been formulated in terms of an optimization problem allowing to keep the agents in a tight formation in real-time. In this paper we revisit these results and propose a new algorithm for the task assignment formulation in view of real-time control by including fault detection and isolation capabilities. The proposed methods will be illustrated by means of a numerical example.

关键词： Safety Trajectory Optimization Silicon Fault detection Equations Real-time systems

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