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Iterative method for designing an observer-based mixed H2/D-stability controller

Iterative method for designing an observer-based mixed H2/D-...

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SICE Annual Conference

作者： Yasushi Kami Eitaku Nobuyama Department of Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Department of systems innovation and informatics Kyushu Institute of Technology Fukuoka Japan

This paper treats the output feedback H 2 control with regional pole placement condition. In general, this problem is a BMI problem which is difficult to be solved theoretically. The purpose of this paper is to propose an iterative method for obtaining a sub-optimal solution of the H 2 control problem with regional pole placement condition. The key idea of this paper is to employ a full-order observer-based controller. The proposed method produces a sequence of controllers which approaches to the unconstrained globally optimal H 2 controller while it satisfies the D-stability constraint. A numerical example shows the effectiveness of our method

关键词： Iterative methods Design methodology Hydrogen Control systems State feedback Optimal control Output feedback Control theory Linear matrix inequalities Educational institutions

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Nonlinear Small-Gain Condition Covering iISS Systems: Necessity and Sufficiency from a Lyapunov Perspective

Nonlinear Small-Gain Condition Covering iISS Systems: Necess...

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IEEE Conference on Decision and Control

作者： Hiroshi Ito Zhong-Ping Jiang Department of Systems Innovation and Informatics Kyushu Institute of Technology Fukuoka Japan Department of Electrical and Computer Engineering Polytechnic University Brooklyn NY USA

ISBN: (纸本)1424401704;9781424401703

This paper presents conditions for stability of interconnected nonlinear systems consisting of integral input-to-state stable subsystems. Both the necessity and the sufficiency are investigated using a Lyapunov formulation. The ultimate result is a necessary and sufficient condition for integral input-to-state stability (iISS) of the interconnection, which is believed to be the first of its kind. This paper derives two sufficient conditions. One is the iISS-ISS small-gain condition which has been proposed earlier by one of the authors. Its sufficiency is strengthened to cover situations more general than the earlier result. The other condition is a universal representation of the nonlinear small-gain condition which has been a popular tool for dealing with input-to-state stable (ISS) subsystems. This paper proves that, for establishing iISS property of the interconnection, the universal representation can deal with iISS subsystems as much as the iISS-ISS small-gain condition if supply rate functions are smooth everywhere and analytic at zero. Furthermore, two necessary conditions this paper derives demonstrate that the nonlinear small-gain condition in the universal form is also necessary for the iISS property

关键词： Sufficient conditions Interconnected systems Indium tin oxide Nonlinear systems Lyapunov method Nonlinear control systems Control systems Control theory Stability criteria Technological innovation

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Server-Initiated Byzantine Agreement over Two-Level Combined Wired/Wireless Networks

Server-Initiated Byzantine Agreement over Two-Level Combined...

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IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Chien-fu Cheng Shu-ching Wang Tyne Liang Department of Computer Science National Chiao Tung University Taiwan Department of Computer Science and Information Engineering Yuanpei University Taiwan Graduate Institute of Informatics Chao Yang University of Technology Taiwan

In previous results, most existing Byzantine agreement (BA) protocols are designed for pure wired or pure wireless networks. In practice, most current networks are combined wired and wireless environments. In this paper, we extend the BA problem over combined wired/wireless network, consisting of both powerful computing processor and low-power mobile processor. Furthermore, the communication overhead of the BA protocol is inherently large because the BA protocol requires numerous rounds to exchange messages. Secure group communications over a combined wired/wireless network is very important. The protocols proposed in this paper use the hierarchical model concept to reduce the communication overhead and provide secure group communications well suited for combined wired/wireless networks

关键词： Wireless networks computer networks Mobile computing Mobile communication Wireless application protocol Distributed computing computer science Power system modeling Bandwidth Concurrent computing

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A future location-prediction replacement strategy for mobile computing environments

A future location-prediction replacement strategy for mobile...

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IEEE Conference on Wireless Communications and Networking

作者： S. Drakatos N. Pissinou Kia Makki C. Douligeris Telecommunication and Information Technology Institute Department of Electrical and Computer Engineering Florida International University Miami FL USA Department of Informatics University of Piraeus Piraeus Greece

While the traditional data shipping systems use physical information to organize data, a newer data caching technique maintains both associated answers (data items) of previous queries and their meaning (purpose). This form of information description is called semantic description, and it makes it possible to reason about and derive knowledge from the given description. In a distributed heterogeneous environment, such as the mobile environment, the semantic data caching paradigm is an important technique for improving the performance of wireless data dissemination systems. Data caching performance depends heavily on the replacement policy being used for the cache management. However, future location ambiguity, limited client resources and frequent client disconnections make cache management a challenge. This paper proposes a future location-aware cache replacement policy to manage a semantic cache. The proposed replacement policy uses the validity of the data fetched from the server and the neighboring locations to decide which of the cache entries is less likely to be needed in the future, and therefore, a good candidate to be evicted when cache space is needed. The replacement policy's preference for cached items to be evicted is modelled as a general function that declines with distance between the cell the candidate for replacement's cached item is bounded to and the query's bound cell. For better efficiency the overall replacement granularity is dynamically achieved along three levels: ring, cell and data item. Simulation study of the proposed approach shows that it outperforms both the least recently used (LRU) and furthest away replacement (FAR) schemes, where only temporal locality is considered. Moreover, the proposed scheme is easier to implement than the industry standard policies

关键词： Mobile computing Bandwidth Physics computing Telecommunication computing Resource management Information systems Information technology informatics Costs Availability

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On necessary conditions for stability of interconnected iISS systems

On necessary conditions for stability of interconnected iISS...

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American Control Conference (ACC)

作者： H. Ito Zhong-Ping Jiang Department of Systems Innovation and Informatics Kyushu Institute of Technology Fukuoka Japan Department of Electrical and Computer Engineering Six Metrotech Center Polytechnic University Brooklyn NY USA

This paper investigates necessary conditions for stability of nonlinear systems made of feedback interconnection of two iISS subsystems. The integral input-to-state stability (iISS) is a dissipative property which includes the input-to-state stability (ISS) as a special case. It is proved that at least one subsystem needs to be ISS for global asymptotic stability of the feedback loop when two subsystems are not completely specified and only their supply rates are available. In contrast, the situation where ODEs describing subsystems are available does not exclude pairs of subsystems which are only iISS. This paper further investigates necessary conditions for global asymptotic stability, and proves that the nonlinear small-gain condition is necessary in the case of unspecified iISS subsystems described with supply rates. When one of the two subsystems is given as a specific ODE, the nonlinear small-gain condition is no longer necessary, while the linear small-gain condition is necessary in the case of linear systems. For nonlinear systems, the necessity recovers only if the supply rate fits the known subsystem tightly in the shape as well as the magnitude

关键词： Nonlinear systems Interconnected systems Asymptotic stability Indium tin oxide Feedback loop Robust control Linear systems Shape Control theory Nonlinear control systems

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Expression Compensation for Face Recognition Using a Polar Geodesic Representation

Expression Compensation for Face Recognition Using a Polar G...

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International Symposium on 3D Data Processing Visualization and Transmission

作者： Iordanis Mpiperis Sotiris Malassiotis Michael G. Strintzis Centre for Research and Technology Hellas Informatics and Telematics Institute Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

This paper addresses the problem of face recognition in the presence of facial deformations caused by expressions. An isometric mapping between surfaces is assumed, which allows preservation of geodesic distance between facial points. Subject to this assumption, we propose a novel technique which integrates 2D and 3D information to establish a new deformation invariant representation of the face. The 3D surface is used to define a polar geodesic coordinate space which is independent of the intrinsic geometry of the face. The corresponding color image is embedded in this space and serves as the recognition data. A preceding stage of hierarchical diffeomorphic grid-based image warping before the recognition process combined with a lip segmentation technique are also employed to increase the overall performance of the algorithm.

关键词： Face recognition Image recognition Geophysics computing Color Humans Face detection Multidimensional systems Geometry Image segmentation Biometrics

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Introducing CPU Time as a Scarce Resource in P2P Systems to Achieve Fair Use in a Distributed DNS

Introducing CPU Time as a Scarce Resource in P2P Systems to ...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Thomas Bocek David Hausheer Reinhard Riedl Burkhard Stiller Communication Systems Group Department of Informatics IFI University of Zurich Switzerland Information Systems Group Department of Informatics IFI University of Zurich Switzerland Computer Engineering and Networks Laboratory TIK Swiss Federal Institute of Technology Switzerland

Peer-to-peer (P2P) systems are flexible, robust, and self-organizing resource sharing infrastructures which are typically designed in a fully decentralized manner. However, a key problem of such systems are peers overusing a resource. This paper presents a fully decentralized scheme to achieve fair use in P2P systems, which does not require a priori information about a peer. The approach developed is based on a scarce resource trading scheme (SRTCPU), which utilizes CPU time as a form of payment. SRTCPU provides an incentive to offer CPU time in return of consuming a scarce resource. A distributed DNS has been implemented as an example application that uses SRTCPU.

关键词： Peer to peer computing Resource management Central Processing Unit Robustness informatics Grid computing Large-scale systems Information systems computer networks Distributed computing

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The influence of MIMO terminal user's hand on channel capacity

The influence of MIMO terminal user's hand on channel capaci...

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European Conference on Antennas and Propagation, EuCAP

作者： T. Zervos A. Alexandridis K. Peppas F. Lazarakis K. Dangakis C. Soras B. Lindmark Department of Electrical & Computer Engineering University of Patras Patras Greece Institute of Informatics & Telecommunications National Centre for Scientific Research Athens Greece Department of Signals Sensors and Systems Royal Institute of Technology Stockholm Sweden

In this paper the impact of user's hand holding a multiple-input-multiple-output (MIMO) terminal on the system performance is investigated. A 4times4 MIMO system is considered with a personal digital assistant (PDA) terminal equipped with a compact array of 4 patch elements. The radiation patterns of the antenna elements are simulated in the presence of the other elements and in the presence of a user's hand. The obtained patterns are used to evaluate the covariance matrix of the receive antenna which is incorporated in a correlation-based MIMO channel model. MIMO channel capacity is calculated to demonstrate the capacity degradation caused by the user's hand.

关键词： MIMO Channel capacity Personal digital assistants Antenna radiation patterns Mobile antennas System performance Impedance Biological tissues Humans Frequency

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Discount Anonymous On Demand Routing for Mobile Ad hoc Networks

Discount Anonymous On Demand Routing for Mobile Ad hoc Netwo...

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International Conference on Security and Privacy for Emerging Areas in Communications Networks (SecureComm)

作者： Liu Yang Markus Jakobsson Susanne Wetzel Software Engineering College Sichuan University Chengdu China School of Informatics Indiana University Bloomington Bloomington IN USA Department of Computer Science Stevens Institute of Technology Hoboken NJ USA

Recent years have seen a large number of proposals for anonymity mechanisms operating on the application layer. Given that anonymity is no stronger than its weakest link, such proposals are only meaningful if one can offer anonymity guarantees on the communication layer as well. ANODR - or anonymous on demand routing - is one of the leading proposals to deal with this issue. In this paper, we propose a novel technique to address the same problem, but at a lower cost. Our proposal, which we dub discount-ANODR, is built around the same set of techniques as ANODR is. Our proposal has the benefit of achieving substantially lower computation and communication complexities at the cost of a slight reduction of privacy guarantees. In particular, discount-ANODR achieves source anonymity and routing privacy. A route is "blindly generated" by the intermediaries on the path between an anonymous source and an identified destination. Route requests in discount-ANODR bear strong similarities to route requests in existing source routing protocols, with the limitation that intermediaries only know the destination of the request and the identity of the previous intermediary - but not whether the latter was the originator of the request. The response to a route request protects the compiled route by means of iterated symmetric encryption, drawing on how messages are prepared before being submitted to a typical synchronous mix network (or onion router). The communication of data subsequently uses such "route onions" to channel the packet to the intended destination. We do not use any key exchange, nor do we utilize public key operations at any time; consequently, we do not need to rely on any PKI, CRL or related constructions

关键词： Mobile ad hoc networks Proposals Costs Privacy Mobile communication Complexity theory Routing protocols Protection Cryptography Public key

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Chunking Japanese Compound Functional Expressions by Machine Learning

Chunking Japanese Compound Functional Expressions by Machine...

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2006 Workshop on Multi-Word-Expressions in a Multilingual Context, MWE 2006

作者： Tsuchiya, Masatoshi Shime, Takao Takagi, Toshihiro Utsuro, Takehito Uchimoto, Kiyotaka Matsuyoshi, Suguru Sato, Satoshi Nakagawa, Seiichi Computer Center Toyohashi University of Technology Tenpaku-cho Toyohashi441-8580 Japan Department of Information and Computer Sciences Toyohashi University of Technology Tenpaku-cho Toyohashi441-8580 Japan Graduate School of Informatics Kyoto University Sakyo-ku Kyoto606-8501 Japan Graduate School of Systems and Information Engineering University of Tsukuba 1-1-1 Tennodai Tsukuba305-8573 Japan National Institute of Information and Communications Technology 3-5 Hikaridai Seika-cho Soraku-gun Kyoto619-0289 Japan Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya464-8603 Japan

The Japanese language has various types of compound functional expressions, which are very important for recognizing the syntactic structures of Japanese sentences and for understanding their semantic contents. In this paper, we formalize the task of identifying Japanese compound functional expressions in a text as a chunking problem. We apply a machine learning technique to this task, where we employ that of Support Vector Machines (SVMs). We show that the proposed method significantly outperforms existing Japanese text processing tools. © EACL 2006 - 11th Conference of the European Chapter of the Association for Computational Linguistics, Proceedings of the Workshop on Multi-Word-Expressions in a Multilingual Context, MWE 2006. All rights reserved.

关键词： Text processing

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