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Construction of Lyapunov-Krasovskii Functionals for Interconnection of Retarded Dynamic and Static Systems via a Small-Gain Condition

Construction of Lyapunov-Krasovskii Functionals for Intercon...

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Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference

作者： Hiroshi Ito Pierdomenico Pepe Zhong-Ping Jiang the Department of Systems Design and Informatics Kyushu Institute of Technology the Department of Electrical and Information Engineering University of L’Aquila the Department of Electrical and Computer Engineering Polytechnic Institute of New York UniversitySix Metrotech Center

This paper addresses the problem of constructing Lyapunov-Krasovskii functionals for verifying integral inputto-state stability(i ISS) and input-to-state stability(ISS) of timedelay nonlinear *** on decomposition of a timedelay system into a dynamic component(a functional differential equation) and static components(functional algebraic equations),this paper develops an i ISS small-gain theorem for the interconnection of these components to assess the stability of the overall time-delay *** discrete and distributed delays can be involved in the dynamic and the static *** result can be considered as a counterpart of the author's previous work which only deals with dynamic *** the construction of Lyapunov-Krasovskii functionals,this paper introduces a new technique which differs from the one employed in the dynamic case.

关键词： ISS Construction of Lyapunov-Krasovskii Functionals for Interconnection of Retarded Dynamic and Static Systems via a Small-Gain Condition Lyapunov

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A preemptive scheduling scheme for flexible QoS provisioning in OBS networks

A preemptive scheduling scheme for flexible QoS provisioning...

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International Conference on Broadband Networks (BroadNets)

作者： Kostas Ramantas Tito Raul Vargas Juan Carlos Guerri Kyriakos Vlachos Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece Instituto de Telecomunicaciones y Aplicaciones Multimedia Universidad Politecnica de Valencia Valencia Spain

In optical burst switching (OBS) networks one of the most challenging problems is to provide service differentiation. The lack of buffering in the intermediate nodes, makes QoS provisioning in OBS networks a difficult problem to address. In this work, we propose a scheduling algorithm that supports QoS based on preemptions, which are controlled by a novel preemption policy. Our claims are validated by analytical modelling and experimental analysis through simulations using data belonging to two different classes of service - best effort and video streaming data. Performance evaluation is based on throughput measurements for best effort class, and perceived quality metrics like PSNR and MOS scores for the video streaming class.

关键词： Quality of service Telecommunication traffic Traffic control Scheduling algorithm Streaming media Processor scheduling computer networks Optical computing Telecommunication computing Optical burst switching

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Combining multimodal and temporal contextual information for semantic video analysis

Combining multimodal and temporal contextual information for...

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IEEE International Conference on Image Processing

作者： Georgios Th. Papadopoulos Vasileios Mezaris Ioannis Kompatsiaris Michael G. Strintzis Informatics and Telematics Institute Centre of Research and Technology Greece Information Proc. Laboratory Electrical & Computer Engineering Department Aristotle University of Thessaloniki Greece

In this paper, a graphical modeling-based approach to semantic video analysis is presented for jointly realizing modality fusion and temporal context exploitation. Overall, the examined video sequence is initially segmented into shots and for every resulting shot appropriate color, motion and audio features are extracted. Then, Hidden Markov Models (HMMs) are employed for performing an initial association of each shot with the semantic classes that are of interest separately for every modality. Subsequently, an integrated Bayesian Network (BN) is introduced for simultaneously performing information fusion and temporal contextual knowledge exploitation, contrary to the usual practice of performing each task separately. The final outcome of the overall video analysis approach is the association of a semantic class with every shot. Experimental results as well as comparative evaluation from the application of the proposed approach in the domain of news broadcast video are presented.

关键词： Information analysis Context modeling Hidden Markov models Feature extraction Data mining Video sequences Gunshot detection systems Multimedia communication Broadcasting Motion analysis

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A framework for translating a high level security policy into low level security mechanisms

A framework for translating a high level security policy int...

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ACS/IEEE International Conference on computer Systems and Applications

作者： Ahmad A. Hassan Waleed M. Bahgat Department of Computer Science and Informatics Taibah University Al Madinah Al Munawwarah Saudi Arabia Department of Communications Misr Engineering and Technology Institute Al Mansoura Egypt

Security policies have different components; firewall, active directory, and IDS are some examples of these components. Enforcement of network security policies to low level security mechanisms faces some essential difficulties. Consistency, verification, and maintenance are the major ones of these difficulties. One approach to overcome these difficulties is to automate the process of translation of high level security policy into low level security mechanisms. This paper introduces a framework of an automation process that translates a high level security policy into low level security mechanisms. The framework is described in terms of three phases; in the first phase all network assets are categorized according to their roles in the network security and relations between them are identified to constitute the network security model. This proposed model extends the organization based access control (OrBAC) model to include not only access control policy but also some other administrative security policies like auditing policy. Besides, it enables matching of each rule of the high level security policy with the corresponding ones of the low level security policy. Through the second phase, the high level security policy is mapped into the network security model. The second phase could be considered as a translation of the high level security policy into an intermediate model level. Finally, the intermediate model level is translated automatically into low level security mechanism. The paper illustrates the applicability of proposed approach through an application example.

关键词： Access control Automation computer security Intrusion detection computer science informatics Maintenance engineering Resource management Specification languages

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Multi-channel scheduling algorithms for fast aggregated convergecast in sensor networks

Multi-channel scheduling algorithms for fast aggregated conv...

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IEEE Internatonal Conference on Mobile Adhoc and Sensor Systems (MASS)

作者： Amitabha Ghosh Ozlem Durmaz Incel V.S. Anil Kumar Bhaskar Krishnamachari Ming Hsieh Department of Electrical Engineering University of Southern California Los Angeles CA USA NETLAB Department of Computer Engineering Bogazici University Istanbul Turkey Department of Computer Science and Virginia Bio-Informatics Institute Virginia Technology Blacksburg VA USA

ISBN: (纸本)9781424451142

Fast and periodic collection of aggregated data is of considerable interest for mission-critical and continuous monitoring applications in sensor networks. In the many-to-one communication paradigm known as convergecast, we consider scenarios where data packets are aggregated at each hop en route to a sink node along a tree-based routing topology and focus on maximizing the data collection rate at the sink by employing TDMA scheduling and multiple frequency channels. Our key result in the paper lies in proving that minimizing the schedule length for an arbitrary network in the presence of multiple frequencies is NP-hard, and in designing approximation algorithms with worst-case provable performance guarantees for geometric networks. In particular, we design a constant factor approximation for networks modeled as unit disk graphs (UDG) where every node has a uniform transmission range, and a O(Delta(T)log n) approximation for general disk graphs where nodes have different transmission ranges; n is the number of nodes in the network and Delta(T) is the maximum node degree on a given routing tree T. We also prove that a constant factor approximation is achievable on UDG even for unknown routing topologies so long as the maximum node degree in the tree is bounded by a constant. We also show that finding the minimum number of frequencies required to remove all the interfering links in an arbitrary network in NP-hard. We give an upper bound on the maximum number of such frequencies required and propose a polynomial time algorithm that minimizes the schedule length under this scenario. Finally, we evaluate our algorithms through simulations and show various trends in performance for different network parameters.

关键词： Scheduling algorithm Frequency Routing Network topology Mission critical systems Monitoring Time division multiple access Algorithm design and analysis Approximation algorithms Tree graphs

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Assessment for Attending and Responding Stages of Affective Teaching Goal in Distance Learning Based on Fuzzy Fusion

Assessment for Attending and Responding Stages of Affective ...

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International Forum on Information technology and Applications, IFITA

作者： Kuo-An Hwang Chia-Hao Yang Chuan-Ren Wang Institute of Networking and Communication Engineering Chao Yang University of Technology Taichung Taiwan Institute of Informatics Chao Yang University of Technology Taichung Taiwan Department of Computer Science and Information Engineering Chao Yang University of Technology Taichung Taiwan

Distance learning is a learning style that can overcome the limitation of time and space. Because of the distance, teachers can not assess the achievement of affective domain teaching goal. If teachers can know the student's affective state through the learning system, they can overcome the difficult. The research applies the image recognition technologies to capture the face images of students and analyzes their participation in discussion to evaluate the student's affective state by fuzzy integral. Finally, teachers can assess the student's achievement in affective domain teaching goal.

关键词： Education computer aided instruction Distance learning Space technology Chaotic communication Information technology Application software computer applications Psychology Electronic learning

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An exterior-point approach to the fixed-order mixed H∞/D-stability controller design

An exterior-point approach to the fixed-order mixed H∞/D-st...

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International Conference on Control and Automation (ICCA)

作者： Takeshi Terada Yasushi Kami Eitaku Nobuyama Department of the Mechanical and Electronic System Engineering Akashi National College of Technology Hyogo Japan Department of the Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781424447060

This paper deals with the mixed H ∞ /D-stability control problem with a fixed-order output feedback controller. It is well known that this control problem is described as a combined bilinear matrix inequality (BMI) problem whose feasible solution is difficult to be found. In this paper, we propose a new exterior-point approach for finding a feasible solution of this problem. The advantage of our approach is to be able to use a non-stabilizing controller as an initial point. Numerical examples show the efficiency of our approach.

关键词： Output feedback Automatic control Linear matrix inequalities Iterative methods Educational institutions Design automation Robust control Uncertainty Time factors computer numerical control

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Foreword to the SMAP '09 Special Session on Intelligence, Adaptation and Personalization on the Web

Foreword to the SMAP '09 Special Session on Intelligence, Ad...

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International Workshop on Semantic Media Adaptation and Personalization (SMAP)

作者： Malamati Louta Angelos Michalas Ioannis Anagnostopoulos Department of Informatics and Telematics Harokopio University of Athens Athens Greece Department of Informatics and Computer Technology Technological Educational Institute of Western Macedonia Kastoria Greece Department of Information and Communication Systems Engineering University of Aegean Samos Greece

For the purpose of the SMAP ’09 Special Session on Intelligence, Adaptation and Personalization on the Web, 5 high quality papers authored by 12 researchers from Greece, Spain, Belgium and Slovakia were selected

关键词： Artificial intelligence Programming Web services Materials Education Data mining Ubiquitous computing

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A recommendation method considering users' time series contexts 09

A recommendation method considering users' time series conte...

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3rd International Conference on Ubiquitous Information Management and Communication, ICUIMC'09

作者： Oku, Kenta Nakajima, Shinsuke Miyazaki, Jun Uemura, Shunsuke Kato, Hirokazu Graduate School of Information Science Nara Institute of Science and Technology Ikoma City Nara 630-0101 Japan Faculty of Computer Science and Engineering Kyoto Sangyo University Motoyama Kamigamo Kita-Ku Kyoto-City 603-8555 Japan Department of Informatics Faculty of Informatics Nara Sangyo University 12-1 Tatsuno-kita 3-chome Sango-cho Ikoma-gun Nara 636-8503 Japan

ISBN: (纸本)9781605584058

This paper proposes a recommendation method considering users' time series contexts which are situations that have occurred/will occur in the past/future. There are some recommendation methods that provide information suitable for users' action patterns as the recommendation methods considering them. These methods provide information referring to the other users that have a similar action pattern to that of an active user. However, since a user's action pattern changes depending on the user's contexts, the methods need to refer to the other users' action patterns related to the current user's contexts. In this paper, we propose a recommendation method considering the user's time series contexts considering that the user's action pattern changes depending on the user's contexts. Copyright 2009 ACM.

关键词： Time series

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A fixed-order D-stability controller design with an output feedback using a modified exterior-point approach

A fixed-order D-stability controller design with an output f...

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Asian Control Conference

作者： Takeshi Terada Yasushi Kami Eitaku Nobuyama Department of the Mechanical and Electronic System Engineering Advanced Courses of Akashi National College of Technology Hyogo Japan Department of the Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781424454402

This paper is concerned with a D-stability controller design problem with a static or a reduced-order output feedback controller. This problem is difficult to be solved theoretically, because it consists of some bilinear matrix inequality's (BMI's). In this paper, an exterior-point approach to this problem, which produces a controller sequence approaching a feasible region from an infeasible one is proposed. The feature of our approach is to be able to use a non-stabilizing controller as an initial point of the sequence. A numerical example shows the efficiency of our approach.

关键词： Output feedback Control systems Electric variables control Linear matrix inequalities Iterative methods Educational institutions Time factors Optimization methods State feedback Systems engineering and theory

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