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19th IFAC World Congress on International Federation of Automatic Control, IFAC 2014

作者： Rego, Francisco Soares, Jorge M. Pascoal, António Aguiar, A. Pedro Jones, Colin Laboratory of Robotics and Systems in Engineering and Science Instituto Superior Técnico University of Lisbon Lisbon Portugal Department of Electrical and Computer Engineering Faculty of Engineering University of Porto Porto Portugal Institute of Mechanical Engineering School of Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland Distributed Intelligent Systems and Algorithms Laboratory School of Architecture Civil and Environmental Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland National Institute of Oceanography Dona Paula Goa India

ISBN: (纸本)9783902823625

This paper addresses the problem of keeping an autonomous marine vehicle in a moving triangular formation by regulating its position with respect to two leader vehicles. The follower vehicle has no prior knowledge of the path described by the leaders but has access to their heading angle and is able to measure inter-vehicle ranges. It is assumed that the distance between the leaders is constant and known. A control strategy is adopted that generates speed and heading commands so as to drive suitably defined along track and cross track errors to zero. The commands are used as input to local inner loops for yaw and speed control. The paper describes the algorithms derived for range-based control and assesses their performance in simulations using realistic models of the vehicles involved. Tests with three autonomous marine vehicles equipped with acoustic modems and ranging devices allow for the evaluation of the performance of the algorithms in a real-world situation. © IFAC.

关键词： Vehicle performance

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A cloaking-based approach to protect location privacy in location-based services 33

A cloaking-based approach to protect location privacy in loc...

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Proceedings of the 33rd Chinese Control Conference, CCC 2014

作者： Zheng, Jiangyu Tan, Xiaobin Zou, Cliff Niu, Yukun Zhu, Jin CAS Key Laboratory of Technology in Geo-spatial Information Processing and Application System University of Science and Technology of China Hefei230026 China Department of Automation University of Science and Technology of China Hefei230026 China Department of Electrical Engineering and Computer Science University of Central Florida OrlandoFL32816-2362 United States

ISBN: (纸本)9789881563842

With the widespread use of mobile devices, the location-based service (LBS) applications become increasingly popular, which introduces the new security challenge to protect user's location privacy. On one hand, a user expects to report his own location as far as possible away from his real location to protect his location privacy. On the other hand, in order to obtain high quality of service (QoS), users are required to report their locations as accurate as possible. To achieve the dedicated tradeoff between privacy requirement and QoS requirement, we propose a novel approach based on cloaking technique. We also discuss the disadvantage of the traditional general system model and propose an improved model. The basic idea of our approach is to select a sub-area from the generated cloaking area as user's reported location. The sub-area may not contain a user's real location, which prevents an adversary from performing attack with side information. Specifically, by defining an objective function with a novel location privacy metric and a QoS metric, we are able to convert the privacy issue to an optimization problem. Then, location privacy metric and QoS metric are given. To reduce the complexity of the optimization, a heuristic algorithm is proposed. Through privacy-preserving analysis and comparison with related work [8], we demonstrate the effectiveness and efficiency of our approach. © 2014 TCCT, CAA.

关键词： Location based services

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Magnetic Flux Density Measurement Based on GMI Senso

Magnetic Flux Density Measurement Based on GMI Senso

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2012 International Conference on Medical Physics and Biomedical engineering(ICMPBE 2012)

作者： Lei Miao Shujia Qin Baolei Xu Hongyi Li Ning Xi Chunmin Yang The State Key Laboratory of Robotics Shenyang Institute of Automation(SIA)Chinese Academy of Sciences(CAS) Graduate School of the Chinese Academy of Sciences Department of Electrical and Computer Engineering Michigan State University(MSU) The GI department of Air force General Hospital

Giant magnetoimpedance(GMI) sensor has obvious advantages of low cost and high sensitivity compared with many other *** paper shows the current measurement result based on GMI *** setup the experiment system to acquire the data via distance *** the paper shows the theoretical results,which is compared to the real experiment *** the real data analysis results,we conclude that GMI sensor may be calibrated.

关键词： Magnetic flux density GMI sensor Calibration Measurement

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Optimization for 3D Model-based Multi-Camera Deployment

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IFAC Proceedings Volumes 2014年第3期47卷 10126-10131页

作者： Xuebo Zhang Jose Luis Alarcon-Herrera Xiang Chen Department of Electrical and Computer Engineering University of Windsor Windsor ON N9B 3P4 Canada Institute of Robotics and Automatic Information System(IRAIS) and Tianjin Key Laboratory of Intelligent Robotics (tjKLIR) Nankai University Tianjin 300071 China

Based on convex optimization techniques, we propose a new multi-camera deployment method for optimal visual coverage of a three-dimensional (3D) object surface. Different from existing methods, the optimal placement of a single camera is formulated as two convex optimization problems, given a set of covered triangle faces. Moreover, this idea is incorporated into a recursive framework to expand the covered area for each camera, wherein initially covered triangle faces are elegantly chosen using an importance criterion for the first recursion. By placing cameras one by one using the same method, the object surface is gradually covered by iteratively removing the covered partition of the previously deployed camera. Due to the usage of convex optimization, each camera is guaranteed to be placed at an optimal pose for a group of triangle faces other than a single one. This merit, together with the importance criterion-based selection of initially covered triangle faces, reduces the number of required cameras while satisfying various constraints including the resolution, field of view, focus and occlusion. Simulation results on two real 3D computer-aided design (CAD) models are presented to verify the effectiveness of the proposed approach.

关键词： Multi-camera deployment convex optimization

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Implementation of fuzzy color extractor on NI myRIO embedded device

Implementation of fuzzy color extractor on NI myRIO embedded...

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International Conference on Multisensor Fusion and Integration for Intelligent Systems (MFI)

作者： David Oswald Wei Li Linwei Niu Jin Zhang Yan Li Jiangchen Yu Fuchun Sun Department of Computer & Electrical Engineering and Computer Science California State University Bakersfield CA USA Department of Computer & Electrical Engineering and Computer Science California State University Bakersfield Liaoning USA Department of Mathematics & Computer Science West Virginia State University USA Robotics State Key Laboratory Chinese Academy of Sciences Shenyang Liaoning China Robotics State Key Laboratory Chinese Academy of Sciences Shenyang China Department of Computer Science and Technology Tsinghua University Beijing China

A fuzzy color extractor is defined by fuzzy rules to extract certain colors based on a color pattern (color seed). In order to extract certain colors from images in real-time, this paper attempts to implement a fuzzy color extractor on NI myRIO embedded device, which features the Xilinx Zynq-7010 all-programmable system including a dual-core ARM® Cortex™-A9 real-time processor and an Artix-7 FPGA with customizable I/O. To implement the fuzzy color extractor on NI myRIO, the fuzzy logic module, real-time module, and FPGA module of Lab VIEW 2013 are required. LabVIEW is a system-design platform and development environment for a visual programming language. First, we define the fuzzy membership functions and fuzzy rules for the fuzzy color extractor using the Fuzzy Logic module. Second, we implement the fuzzy color extractor using Real-Time module. Finally, we implement the fuzzy color extractor a DaNI robot to test the color extraction performance under varying illumination conditions.

关键词： Image color analysis Nickel Robots Cameras Feature extraction Fuzzy logic Real-time systems

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Decoding of Intentional Actions from Scalp Electroencephalography (EEG) in Freely-behaving Infants

Decoding of Intentional Actions from Scalp Electroencephalog...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Zachery R. Hernandez Jesus Cruz-Garza Teresa Tse Jose L. Contreras-Vidal Non-Invasive Brain-Machine Interface Systems Laboratory at the Department of Electrical and Computer Engineering University of Houston (UH) Center for Robotics and Intelligent Systems Tecnologico de Monterrey

ISBN: (纸本)9781424479276

The mirror neuron system (MNS) in humans is thought to enable an individual's understanding of the meaning of actions performed by others and the potential imitation and learning of those actions. In humans, electroencephalographic (EEG) changes in sensorimotor a-band at central electrodes, which desynchronizes both during execution and observation of goal-directed actions (i.e., μ suppression), have been considered an analog to MNS function. However, methodological and developmental issues, as well as the nature of generalized μ suppression to imagined, observed, and performed actions, have yet to provide a mechanistic relationship between EEG μ-rhythm and MNS function, and the extent to which EEG can be used to infer intent during MNS tasks remains unknown. In this study we present a novel methodology using active EEG and inertial sensors to record brain activity and behavioral actions from freely-behaving infants during exploration, imitation, attentive rest, pointing, reaching and grasping, and interaction with an actor. We used δ-band (1-4Hz) EEG as input to a dimensionality reduction algorithm (locality-preserving Fisher's discriminant analysis, LFDA) followed by a neural classifier (Gaussian mixture models, GMMs) to decode the each MNS task performed by freely-behaving 6-24 month old infants during interaction with an adult actor. Here, we present results from a 20-month male infant to illustrate our approach and show the feasibility of EEG-based classification of freely occurring MNS behaviors displayed by an infant. These results, which provide an alternative to the μ-rhythm theory of MNS function, indicate the informative nature of EEG in relation to intentionality (goal) for MNS tasks which may support action-understanding and thus bear implications for advancing the understanding of MNS function.

关键词： Electroencephalography Scalp Acceleration Training Coherence Electrodes Testing

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A scalable FPGA-based architecture for digital controllers and a corresponding rapid prototyping design methodology

A scalable FPGA-based architecture for digital controllers a...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Christoforos Economakos Maria Tzamtzi George Economakos Department of Automation Engineering Technological Educational Institution of Sterea Ellada Greece National Technical University of Athens School of Electrical and Computer Engineering Microprocessors and Digital Systems Laboratory Athens Greece

Recent advances in embedded automation applications require quality of results in terms of speed and computational complexity, along with strict time-to-market schedules. To cope with these demands, the design industry is searching for novel approaches. Performance is sought by utilizing modern FPGA devices, offering hundreds of GFLOPs with maximum power efficiency. Productivity is enforced with modern design methodologies like High-Level Synthesis and Electronic System Level design, that offer an efficient abstraction level to boost-up early prototyping. This paper presents a scalable architecture and a corresponding design methodology for the design of digital controllers, as a reference for modern control applications. The advantages of the proposed methodology are: (a) improved performance through hardware acceleration of demanding application cores, (b) improved quality of results with floating point calculations, (c) flexibility and integration of common peripheral devices supported by a RISC microcontroller, (d) low-overhead scalability from single core to multi core architectures and (e) improved designer productivity by working with C level design descriptions only. Experimental results show that the proposed System-on-Chip architecture is an efficient rapid prototyping platform for digital control applications, with very promising future extension capabilities.

关键词： Hardware computer architecture Field programmable gate arrays Software Microcontrollers Digital signal processing Performance evaluation

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Quantized nonlinear control-a cyclic-small-gain approach

Quantized nonlinear control-a cyclic-small-gain approach

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World Congress on Intelligent Control and automation (WCICA)

作者： Tengfei Liu Zhong-Ping Jiang State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang China Department of Electrical and Computer Engineering 5 MetroTech Center Brooklyn NY USA

The problem of controlling systems through quantized communication channels has recently attracted a lot of attention from the controls community. The strong nonlinear characteristics of quantization such as discontinuity and saturation cause the major difficulties of quantized control. This paper reviews the results available in the literature of quantized control of linear and nonlinear systems, and specifically discusses the design techniques for quantized nonlinear control. With quantization considered as perturbation, robust control design ideas play an important role in quantized nonlinear control. We discuss how the quantized control problems are handled by modifying the robust nonlinear control techniques. In particular, it is shown that the notion of input-to-state stability (ISS) and its small-gain methods are quite powerful for quantized control of high-order nonlinear systems due to the capability of dealing with uncertainty, strong nonlinearity and interconnections. The paper ends with some future research directions of quantized nonlinear control. While many classical tools could be used for the future development, the ISS small-gain methods turn out to be fundamental in handling the complexity caused by quantization.

关键词： Quantization (signal) Closed loop systems Robustness Nonlinear dynamical systems Measurement errors

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Semi-global leader-following consensus of multiple linear systems with position and rate-limited actuators: The state feedback case

Semi-global leader-following consensus of multiple linear sy...

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World Congress on Intelligent Control and automation (WCICA)

作者： Zhiyun Zhao Zongli Lin Department of Automation Key Laboratory of System Control and Information Processing Shanghai China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville VA USA

This paper studies the semi-global leader-following consensus problem for a group of linear systems in the presence of both actuator position and rate saturation. Each follower agent in the group is described by a general linear system subject to simultaneous actuator position and rate saturation. We construct a low gain based linear state feedback control law for each follower agent and show that semi-global leader-following consensus can be achieved by using these control laws when the communication topology among follower agents is a connected undirected graph and the leader is a neighbor of at least one follower. Simulation results illustrate the theoretical results.

关键词： Actuators State feedback Topology Linear systems Multi-agent systems Closed loop systems Vectors

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Distributed control of nonlinear uncertain systems: A cyclic-small-gain approach

Distributed control of nonlinear uncertain systems: A cyclic...

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World Congress on Intelligent Control and automation (WCICA)

This paper presents a cyclic-small-gain approach to distributed control of nonlinear multi-agent systems in the strict-feedback form for output agreement. Through a novel nonlinear control law design, the output agreement problem is transformed into a stabilization problem, and the closed-loop multi-agent system is transformed into a large-scale system composed of input-to-output stable (IOS) subsystems which are interconnected with each other through redefined outputs. The cyclic-small-gain theorem is employed as a fundamental tool to guarantee the IOS of the closed-loop large-scale system and the practical output-agreement of the multi-agent system. Moreover, if the system is disturbance-free, then accurate output-agreement is achievable. Interestingly, the closed-loop multi-agent system is also robust with respect to bounded time-delays in information exchange.

关键词： Nickel Decentralized control Multi-agent systems Information exchange Robustness Feedback control Power system stability

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