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The 8th World Congress on Intelligent Control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Dongxiao Wu Jun Wu Sheng Chen State Key Laboratory of Industrial Control Technology　Institute of Cyber-System and Control　Zhejiang School of Electronics and Computer Science University of Southampton Highfield Southampton SO17 1BJ

This paper considers analysis and synthesis of discrete-time networked control systems (NCSs), where the plant has additive uncertainty and the controller is updated with the sensor information at stochastic time intervals. It is shown that the problem is linked to robust control of linear discrete-time stochastic systems and a new small gain theorem is established. Based on this result, sufficient conditions are given for ensuring mean square stability of the NCS, and the genetic algorithm is utilised to design the controller of the NCS based on a linear matrix inequality technique.

关键词： Stochastic systems Networked control systems Delay Stability analysis Robust control Observers Additives

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The Transition Between Sharp and Rounded Features and the Manipulation of Incompatible Boundary in Filling n-sided Holes

The Transition Between Sharp and Rounded Features and the Ma...

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International Conference on Shape Modeling and Applications

作者： Kan-Le Shi Jun-Hai Yong Peng Liu Jia-Guang Sun Jean-Claude Paul Key Laboratory of Information System Security Ministry of Education of China Beijing China Department of Computer Science and Technology Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China School of Software Tsinghua University Beijing China Tsinghua University Beijing Beijing CN INRIA France

ISBN: (纸本)9781424472598;9780769540726

N-sided hole filling plays an important role in vertex blending. Piegl and Tiller presented an algorithm to interpolate the given boundary and cross-boundary derivatives in B-spline form. To deal with the incompatible cases that their algorithm cannot handle, we propose an extension method to manipulate the transition between sharp and rounded features. The algorithm first patches n crescent-shaped extended surfaces to the boundary with G 2 continuity to handle incompatibility problem in the corners. Then, we compute the inner curves and the corresponding cross-boundary derivatives fulfilling tangent and twist compatibilities. The generated B-spline Coons patches are G 1 -continuously connected exactly, and have ε-G 1 continuity with the extended surfaces. Our method improves the continuity-quality of the shape and reduces the count of the inserted knots. It can be applied to all G 0 -continuous boundary conditions without any restrictions imposed on the boundary or cross-boundary derivatives. It generates better shapes than some popular industrial modeling systems on these incompatible occasions. Some examples underline its feasibility.

关键词： Filling Spline Shape Educational technology Laboratories computer science Information science Information systems computer security Information security

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Authenticated Asymmetric Group Key Agreement Protocol and Its Application

Authenticated Asymmetric Group Key Agreement Protocol and It...

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IEEE International Conference on Communications

作者： Lei Zhang Qianhong Wu Bo Qin Department of Computer Engineering and Mathematics Universitat Rovira i Virgili Catalonia Spain School of Computer Key Laboratory of AeroSpace Information Security and Trusted Computing Ministry of Education Wuhan University of China China School of Science Department of Maths Xi''an University of Technology China

A recent primitive known as asymmetric group key agreement allows a group of users to negotiate a common encryption key which is accessible to any entities while each user holds her respective secret decryption key. This concept not only enables confidential communications among group users but also permits any outsider to send encrypted messages to the group. The existing instantiation is only secure against passive adversaries. In this paper, we first propose an authenticated asymmetric group key agreement protocol which captures the practical security properties against active attacks. Based on our protocol, we then propose a broadcast encryption system without relying on a trusted dealer to distribute the secret keys to the users. Our system has also short ciphertexts. Furthermore, the proposal is equipped with the perfect forward security property.

关键词： Protocols Cryptography Broadcasting Peer to peer computing Communication system security Bandwidth Communication channels Multimedia communication Communications Society Application software

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Performance evaluation of Independent Component Analysis in an iris recognition system

Performance evaluation of Independent Component Analysis in ...

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ACS/IEEE International Conference on computer systems and Applications

作者： Imen Bouraoui Salim Chitroub Ahmed Bouridane Signal and Image Processing Laboratory Electronics and Computer Science Faculty University of Sciences and Technology Houari Boumediene Algiers Algeria School of Computing Engineering and Information Sciences Northumbria University Newcastle-upon-Tyne UK

The overall performance of any iris recognition system relies on the performance of its components, which are preprocessing, feature extraction and matching. Feature extraction is the important step of such recognition system, but it is strongly dependent on the pre-processing step that is consisting of localising and normalising the iris. In this paper, Independent Component Analysis (ICA), which is a recently developed statistical method for data analysis, is applied for extracting the features for iris region of interest that are statistically independent. Based on some mathematical criteria, the performance of ICA is evaluated by using two different subsets of CASIA-V3 iris image database. The obtained results are convincing and some future improved research works are subsequently envisaged.

关键词： Iris recognition Feature extraction Entropy Iris Transforms Vectors Random variables

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Facial expression synthesis based on emotion dimensions for affective talking avatar

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Smart Innovation, systems and Technologies 2010年第1期2010卷 109-132页

作者： Zhang, Shen Wu, Zhiyong Meng, Helen M. Cai, Lianhong Key Laboratory of Pervasive Computing Ministry of Education Tsinghua National Laboratory for Information Science and Technology Department of Computer Science and Technology Tsinghua University Beijing 100084 China Tsinghua-CUHK Joint Research Center for Media Sciences Technologies and Systems Graduate School at Shenzhen Tsinghua University Shenzhen China Department of Systems Engineering and Engineering Management The Chinese University of Hong Kong HKSAR Hong Kong

ISBN: (纸本)9783642126031

Facial expression is one of the most expressive ways for human beings to deliver their emotion, intention, and other nonverbal messages in face to face communications. In this chapter, a layered parametric framework is proposed to synthesize the emotional facial expressions for an MPEG4 compliant talking avatar based on the three dimensional PAD model, including pleasure-displeasure, arousal-nonarousal and dominance-submissiveness. The PAD dimensions are used to capture the high-level emotional state of talking avatar with specific facial expression. A set of partial expression parameter (PEP) is designed to depict the expressive facial motion patterns in local face areas, and reduce the complexity of directly manipulation of low-level MPEG4 facial animation parameters (FAP). The relationship among the emotion (PAD), expression (PEP) and animation (FAP) parameter is analyzed on a virtual facial expression database. Two levels of parameter mapping are implemented, namely the emotion-expression mapping from PAD to PEP, and the linear interpolation from PEP to FAP. The synthetic emotional facial expression is combined with the talking avatar speech animation in a text to audio visual speech system. Perceptual evaluation shows that our approach can generate appropriate facial expressions for subtle and complex emotions defined by PAD and thus enhance the emotional expressivity of talking avatar. © Springer-Verlag Berlin Heidelberg 2010.

关键词： Mapping

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Multiple-Pursuer Cooperative Multiple-Evader Games based on auction mechanism

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Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of technology 2010年第SUPPL. 2期42卷 160-164页

作者： Cai, Ze-Su Hong, Bing-Rong Sun, Li-Ning State Key Laboratory Robotics and System Harbin Institute of Technology Harbin 150001 China School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 China

This paper mainly discusses Multiple-Pursuer Cooperative Multiple-Evader Games, in which a team of autonomous mobile robots act as pursuers to pursue multiple moving targets cooperatively. The traditional Contract Net protocol is extended, including the motivational vector of robot, the trust degree and the acquaintance degree to improve the alliance decision. In order to reduce the communication load during the task negotiation process, the auction mechanism in Economics was introduced, and an improved task negotiation process based on auction was proposed in this paper. It allocated task dynamically through capability classification and independent competition. It can support the dynamically changing capability of each agent and reduce the cost of communication and the difficulty of acquiring knowledge. Based on these extensions, a kind of multi-robot cooperative pursuit algorithm that allows dynamic alliance is proposed. Simulation results show the feasibility and validity of the given algorithm.

关键词： Multipurpose robots

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Selected Crosstalk Avoidance Code for Reliable Network-on-Chip

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Journal of computer science & technology 2009年第6期24卷 1074-1085页

作者：张颖李华伟李晓维 Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences

With the shrink of the technology into nanometer scale, network-on-chip （NOC） has become a reasonable solution for connecting plenty of IP blocks on a single chip. But it suffers from both crosstalk effects and single event upset （SEU）, especially crosstalk-induced delay, which may constrain the overall performance of NOC. In this paper, we introduce a reliable NOC design using a code with the capability of both crosstalk avoidance and single error correction. Such a code, named selected crosstalk avoidance code （SCAC） in our previous work, joins crosstalk avoidance code （CAC） and error correction code （ECC） together through codeword selection from an original CAC codeword set. It can handle possible error caused by either crosstalk effects or SEU. When designing a reliable NOC, data are encoded to SCAC codewords and can be transmitted rapidly and reliably across NOC. Experimental results show that the NOC design with SCAC achieves higher performance and is reliable to tolerate single errors. Compared with previous crosstalk avoidance methods, SCAC reduces wire overhead, power dissipation and the total delay. When SCAC is used in NOC, it can save 20% area overhead and reduce 49% power dissipation.

关键词： crosstalk avoidance codeword selection reliable network-on-chip single event upset

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Internal model control for hysteretic nonlinear systems based on support vector regression

Internal model control for hysteretic nonlinear systems base...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Wenguang Zhang Jianqin Mao Yanhua Ma Beijing Key Laboratory of Measurement and Control Technology and System for Industrial Process Control & Computer Engineering School North China Electric Power University Beijing China School of Automation Science and Electrical Engineering Beijing Aeronautics and Astronautics University Beijing China

Aim at the hysteretic nonlinearity characteristic of the giant magnetostrictive actuator in control, an internal model control method based on support vector regression is presented in this paper. Its models are built by support vector regression using the input and output data of the actuator and the internal model control is achieved. The simulation results show the method in this paper has better control precision.

关键词： Support vector machines Actuators Automation Data models Computational modeling Hysteresis Magnetostriction

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Availability based trust model of clusters for MANET

Availability based trust model of clusters for MANET

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International Conference on services systems and services Management, ICSSSM

作者： Xibin Zhao Zhiyang You Zhifeng Zhao Danning Chen Feng Peng Key Laboratory of Information System Security of Ministry of Education School of Software Tsinghua University China Department of Computer Science and Technology Tsinghua University China Zhenjiang Watercraft College Department of Computer Science Zhenjiang Watercraft College China School of Software Tsinghua University China China Minzu Securities Company Limited China

MANET (Mobile ad hoc network) is vulnerable to security attack due to its characteristics such as open network environment, lack of centralized control, dynamic topology, and so on, while traditional security mechanisms cannot meet the security requirements of MANET due to the limited communication bandwidth, computation power, memory and battery capacity, and dynamic deployment environment. Many approaches have been suggested to trade-off between the security strength and efficiency, and most of them focus on the confidentiality and integrity of MANET while pay less attention to the availability issue. Based on the analysis of availability related factors in MANET, we present an availability based trust model in this paper. Furthermore, a cluster based trust model (ABTMC, Availability Based Trust Model of Clusters) is presented with the consideration with the resource constrain of node, dynamic topology, and the unbalance of computing capability and resource capability among MANET nodes. Many availability oriented security service can be obtained based on this model.

关键词： Mobile ad hoc networks Availability computer security Communication system security Information security Communication system software computer science Network topology Environmental management Proposals

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The generation of transport networks based on DLA model in an artificial society model with characteristics of geographical systems

The generation of transport networks based on DLA model in a...

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International Conference on computer and Automation Engineering, ICCAE

作者： Lihu Pan Heqing Huang School of Computer Taiyuan University of Science and Technology Taiyuan China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy and Sciences Beijing China Chinese Academy of Sciences China

ISBN: (纸本)9781424455850

The artificial society modeling approach for studying the behavior of complex systems has gained wide applications in recent years. The integration of this approach with geographical theories provides an inter-disciplinary approach to the study of complex human-nature interactions. By deploying widely applied RePast and Eclipse as basic tools, this study develops an artificial society model that is able to capture the characteristics of geographical systems. Consequently, DLA (diffusion limited aggregation) algorithms are applied to generate and record each agent's pathway. The simulated results demonstrate that the transportation networks produced with DLA algorithms have a spatial pattern very similar to the form of urban areas exhibited in real world.

关键词： Character generation Power system modeling Environmental economics Java Software libraries Open source software Information systems Computational modeling Urban areas Digital elevation models

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