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Active Mode Identification Of Switching systems

Active Mode Identification Of Switching Systems

引用

IEEE Conference on Decision and Control

作者： M. Baglietto G. Battistelli L. Scardovi Department of Communications Computer and System Sciences DIST-University of Genoa Genoa Italy Dipartimento di Sistemi e Informatica Università di Firenze Florence Italy Department of Electrical Engineering and Computer Science University of Liège Liege Belgium

ISBN: (纸本)1424401704;9781424401703

In this paper active mode observability is addressed for a class of discrete-time linear systems that may switch in an unknown and unpredictable way among different modes taken from a finite set. The active mode observation problem consists in determining control sequences (discerning control sequences) that allow to identify the switching sequence on the basis of the observations. The presence of unknown but bounded noises affecting both the system and measurement equations is taken into account. In particular, a general condition is derived that characterizes discerning controls in a finite-horizon setting. Such a result is extended to the infinite-horizon case in order to derive "persistently discerning" control sequences. Numerical examples are reported to clarify the approach

关键词： Switching systems Control systems Observability Linear systems Switches Equations Communication system control USA Councils Noise measurement Logic

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CTH13-6: Distributive High-Rate Space-Frequency Codes Achieving Full Cooperative and Multipath Diversities for Asynchronous Cooperative Communications

CTH13-6: Distributive High-Rate Space-Frequency Codes Achiev...

引用

IEEE Globecom 2006

作者： Yabo Li Wei Zhang Xiang-Gen Xia Department of Electrical and Computer Engineering CDMA system design group Nortel Networks University of Delaware Richardson TX USA Department of Electric & Electronic Engineering Clear Water Bay Kowloon Hong Kong University of Science and Technology Hong Kong China Department of Electrical and Computer Engineering University of Delaware Newark DE USA

Using OFDM and space-time coding to achieve asynchronous cooperative diversity has been proposed by Mei et. al. and Shin et al, where orthogonal space-time block codes, Alamouti code in particular, were used at relay nodes. This proposed space-time coding can not achieve the multipath diversity when the channels from nodes to nodes are frequency selective fading. In this paper, we also consider asynchronous cooperative communications where the channels are assumed to be frequency-selective fading. We design high rate distributed space-frequency codes to achieve both full asynchronous cooperative diversity and multipath diversities.

关键词： Relays OFDM Frequency synchronization Fading Delay Transceivers Block codes Frequency diversity Receiving antennas Costs

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Image Restoration for Security Cameras with Dirty Lens under Oblique Illumination

Image Restoration for Security Cameras with Dirty Lens under...

引用

IEEE International Workshop on Imaging systems and Techniques (IST)

作者： Y. Fujii N. Ohta T. Ito S. Saitoh T. Matsuura T. Yamamoto Department of Electronic Engineering Faculty of Engineering Gunma University Gunma Japan Department of Computer Science Faculty of Engineering Gunma University Japan Department of Electronic Engineering Faculty of Engineering Gunma University Japan Department of Mathematics Faculty of Engineering Gunma University Japan Department of Mechanical System Engineering Faculty of Engineering Gunma University Japan Department of Physics Faculty of Engineering Gunma University Japan

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Interoperability between AEH user models

Interoperability between AEH user models

引用

Joint International Workshop on Adaptivity, Personalization and the Semantic Web, APS'06

作者： Stewart, Craig Celik, Ilknur Cristea, Alexandra Ashman, Helen Department of Electronic Engineering Queen Mary University of London Mile End Road London E1 4NS United Kingdom School of Computer Science and Information Technology University of Nottingham Jubilee Campus Wollaton Road Nottingham NG8 1BB United Kingdom Information System Department Faculty of Mathematics and Computing Science Technical University Eindhoven Den Dolech 2 5600 MB Eindhoven Netherlands

ISBN: (纸本)1595934537

Creating a good quality Adaptive Educational Hypermedia (AEH) system involves a great expenditure of time, effort and money, especially to author the materials in order to implement adaptivity. Moreover, authoring AEH systems is as hard as maintaining them. Furthermore, with the new advances in AEH development, the authored content in a given system can become outdated very rapidly. When the massive overhead in authoring is combined with the possibility of the current AEH system becoming unavailable due to lack of maintenance, providing interoperability of adaptive systems becomes necessary. This paper describes our research on providing interoperability of user models between different AEH systems via a one-to-one conversion between two AEH systems, MOT and WHURLE. Here, we identify the differences and commonalities and address how these influence the efficiency of the conversion of the two systems' user models. Although this conversion is done via simple peer-to-peer interaction, it can be easily extended to make use of semantic web technologies, as for example RDF or XML conversion formats, or web services for user model exchange. Therefore, we consider that our work on feature extractions sets the basis for such conversions for the Web and Semantic Web. Copyright 2006 ACM.

关键词： Education

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Measurement of Space Variant PSF for Restoring Degraded Images by Security Cameras

Measurement of Space Variant PSF for Restoring Degraded Imag...

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SICE Annual Conference

作者： Tadashi Ito Yusaku Fujii Naoya Ohta Saburou Saitoh Tsutomu Matsuura Takao Yamamoto Department of Electronic Engineering Gunma University Kiryu Japan Department of Computer Science Gunma University Kiryu Japan Department of Mathematics Gunma University Kiryu Japan Department of Mechanical System Engineering Gunma University Kiryu Japan Department of Physics Gunma University Kiryu Japan

Images recorded by a security camera have often severely degraded due to dirty lens or secular distortion of the recording system. To restore these images, the fully determination of space variant point spread function (PSF) is required. To measure PSF, we used a liquid crystal display. We made some experiment to restore the images by a CCD camera with intentionally distorted optics

关键词： Extraterrestrial measurements Image restoration Degradation Security Cameras Optical distortion Distortion measurement Optical recording Lenses Liquid crystal displays

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Impact of an ARQ Scheme in the MAC/LLC Layer on Upper-layer Packet Transmissions over a Markovian Channel

Impact of an ARQ Scheme in the MAC/LLC Layer on Upper-layer ...

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IEEE Conference on Vehicular Technology (VTC)

作者： Jun-Bae Seo Nam-Hoon Park Hyong-Woo Lee Choong-Ho Cho Department of Wireless System Research Electronics and Telecommnications Research Institute Daejeon South Korea Department of Electronics and Information Engineering Korea University South Korea Department of Computer and Information Science Korea University South Korea

In this paper, we capture the impact of an ARQ scheme in the MAC/LLC layer with a forward error-correcting code on upper-layer packet transmissions over a Markovian channel by examining the performance of a single service data unit which may be either a TCP segment or a UDP packet. We assume that the ACK/NACK delay of ARQ blocks belong to a single service data unit is less than the transmission period of each ARQ block. The performance measures of a single service data unit transmission are derived in terms of the transmission success and failure probabilities given a retransmission time-out value, retransmission timeout probability and the moments of transmission delay. Further, the queueing performance of a service data unit transmitter is also presented by varying average received signal-to-noise ratio, mobile velocity, number of ARQ blocks needed to transmit a single service data unit, number of retransmissions for each ARQ block and error-correcting capability applied to an ARQ block. From numerical examples, renegotiation between a serving base station and a mobile station is needed, when the mobile station is far from the serving base station in order that a service data unit is fragmented into a larger number of ARQ blocks in order to apply high error-correcting capability for each one

关键词： Automatic repeat request Delay TCPIP Wireless application protocol Propagation losses Error correction codes Base stations Transmitters Signal to noise ratio Ground penetrating radar

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Binary sequences with optimal correlations and large linear span

Binary sequences with optimal correlations and large linear ...

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2006 IEEE International Conference on Communications, ICC 2006

作者： Xiangyong, Zeng Lei, Hu Qingchong, Liu Yuhong, Zhu Faculty of Mathematics and Computer Science Hubei University Wuhan Hubei 430062 China Graduate School Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China Department of Electrical and System Engineering Oakland University Rochester MI 48309 United States Laudis Systems LLC 80 Newfield Avenue Edison NJ 08837 United States

ISBN: (纸本)1424403553

A family of binary sequences is presented and proved to have optimal correlations and large linear span. It includes the small set of Kasami sequences, No sequence set and TN sequence set as special cases. A lower bound on the linear span of the family is provided. With suitable choices of parameters, it is proved that the family has exponentially larger linear spans than both No sequences and TN sequences. © 2006 IEEE.

关键词： Binary sequences

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Interoperable Adaptive Educational Hypermedia: A Web Service Definition

Interoperable Adaptive Educational Hypermedia: A Web Service...

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International Conference on Advanced Learning Technologies (ICALT)

作者： M. Meccawy I. Celik A. Cristea C. Stewart H. Ashman School of Computer Science and Information Technology University of Nottingham Nottingham UK Information System Department Faculty of Mathematics and Computing Science Technical University Eindhoven Netherlands Department of Electronic Engineering Queen's Mary University of London London UK

This paper presents an approach to resolve the problem of authoring and interchanging educational material, based on Web services. Here we describe the ultimate goal, of reusing and interchanging freely adaptive e-learning material, shortly sketch previous solutions, showing their benefits but also limitations and then introduce our Web-service based approach. Finally, we discuss the gains brought by our proposed solution

关键词： Web services Simple object access protocol Electronic learning XML Service oriented architecture computer science Information technology Information systems Mathematics Standards development

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Advantages of inset PM machines for zero-speed sensorless position detection

Advantages of inset PM machines for zero-speed sensorless po...

引用

Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Nicola Bianchi Silverio Bolognani Ji-hoon Jang Seung-ki Sul Department of Electrical Engineering University of Padova Padova Italy HEV System Engineering Team Corporate Research & Development Division Hyundai motor company South Korea School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

The aim of this paper is to analyze the behavior of a sensorless control system based on a high-frequency signal injection combined with an inset PM motor. The rotor position of a synchronous permanent magnet (PM) motor with anisotropic rotor can be detected by the control system which superimposes a high-frequency signal to the steady-state stator voltage. The corresponding high-frequency current is modulated by the rotor anisotropy and used to determine the rotor position. These techniques are effective at zero and at low motor speed. Both saturation and cross-coupling have a heavy influence on the correct rotor position detection. In order to highlight the effectiveness of the sensorless technique, the tests are carried out at various operating conditions

关键词： Rotors Permanent magnet motors Synchronous motors Sensorless control Anisotropic magnetoresistance Signal analysis Magnetic analysis Voltage control Control systems Steady-state

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Time-varying failure rate extraction in electric power distribution equipment

Time-varying failure rate extraction in electric power distr...

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International Conference on Probabilistic Methods Applied to Power systems (PMAPS)

作者： Jong-Fil Moon Jea-Chul Kim Hee-Tae Lee Sang-Seung Lee Yong Tae Yoon Kyung-Bin Song Power System Laboratory Korea Electrical Engineering and Science Research Institute Seoul South Korea Department of Electrical Engineering Soongsil University Seoul South Korea School of Electrical Engineering and Computer Sciences Seoul National University Seoul South Korea

Reliability evaluation of power distribution system is very important to both power utilities and customers. It presents the probabilistic number and duration of interruption such as failure rate, SAIDI, SAIFI, and CAIDI. However, it has a fatal weakness at reliability index because of accuracy of failure rate. In this paper, the time-varying failure rate (TFR) of power distribution system equipment is extracted from the recorded failure data of Korea Electric Power Corporation (KEPCO) in Korea. For TFR extraction, it is used that the fault data accumulated by KEPCO during 10 years. The TFR is approximated to bathtub curve using the exponential (random failure) and Weibull (aging failure) distribution function. In addition, Kaplan-Meier estimation is applied to TFR extraction because of incomplete failure data of KEPCO. Finally, probability plot and regression analysis is applied. It is presented that the extracted TFR is more effective and useful than mean failure rate (MFR) through the comparison between TFR and MFR

关键词： Power system reliability Data mining Weibull distribution Power distribution Failure analysis Power systems Time varying systems Moon Switches Hazards

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