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IEEE International Conference on Rehabilitation Robotics (ICORR)

作者： Sang Wan Lee Taeyoub Yi Jeong-Su Han Hyoyoung Jang Heon-Hui Kim Jin-Woo Jung Zeungnam Bien Electrical Engineering and Computer Science Department Korean Advanced Institute of Science and Technology Daejeon South Korea Core Technology Laboratory Digital Appliances Research and Development Center Samsung Electronics Company Limited Suwon South Korea Human-friendly Welfare Robot System Engineering Research Center Korean Advanced Institute of Science and Technology Daejeon South Korea Computer Engineering Department Dongguk University Seoul South Korea

This paper presents a total solution on EMG signal-based walking phase recognition for people with lower limb disability. Various environmental factors such as sensed location, walking speed, and ground inclination are taken into consideration in all the phases of signal sensing, feature extraction, feature selection, and classification. Based on analysis on fourteen well-known feature extraction methods in varying environmental situation, this paper proposes a methodology for selecting a good feature set, and then demonstrates effectiveness of the proposed approach with the classification results.

关键词： Legged locomotion Electromyography Muscles Feature extraction Environmental factors Humans Rehabilitation robotics Robots systems engineering and theory Working environment noise

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Router enhanced NAT method for peer-to-peer network

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Ruan Jian Xue Bao/Journal of Software 2007年第SUPPL.期18卷 88-94页

作者： Zhang, Jian-Wei Pi, Ren-Jie Zhan, Xiao-Su Guo, Yun-Fei National Digital Switch System Engineering and Technological Research Center Zhengzhou 450002 China Department of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 China Department of Computer and Communication Zhengzhou University of Light Industry Zhengzhou 450002 China Department of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

The deployment of symmetric NAT makes the communication between hosts in a peer-to-peer application very difficult, which needs many relay node to provide NAT traversal service. Traditional relay nodes are all server hosts lie in the edge of network. To reduce the duplicate traffic and excess router load caused by server relaying, a UDP switch based router enhanced NAT method is proposed in this paper, which can resolve the bottleneck of network bandwidth by enhance router function independently.

关键词： Routers

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Safety concerns on operating UAV using cooperative multiagent negotiation

Safety concerns on operating UAV using cooperative multiagen...

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作者： Corrêa, Mário A. Camargo Jr., João B. Gimenes, Ricardo A.V. Almeida Jr., Jorge R. Safety Analysis Group of Computer Digital System Engineering Department University of São Paulo São Paulo Brazil

ISBN: (纸本)8587978128

Abstract Developed countries have made significant efforts to integrate UAV operations in controlled aerial space due to a rising interest of using Unmanned Aerial Vehicles (UAV) for civilian purposes. This study focuses the use of multi-agent architecture to distribute the workload of detecting and solving conflicts between the aircraft and the UAV with no intervention from ground-based facilities. Midair collision risk was the main unsafe situation evaluated using an aircraft collision model based on air traffic density data. Copyright © 2006 IFAC.

关键词： Air traffic control

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SAFETY CONCERNS ON OPERATING UAV USING COOPERATIVE MULTIAGENT NEGOTIATION

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IFAC Proceedings Volumes 2006年第20期39卷 102-107页

作者： Mário A. Correa João B. Camargo Ricardo A.V. Gimenes Jorge R. Almeida Safety Analysis Group of Computer Digital System Engineering Department University of São Paulo São Paulo Brazil

Developed countries have made significant efforts to integrate UAV operations in controlled aerial space due to a rising interest of using Unmanned Aerial Vehicles (UAV) for civilian purposes. This study focuses the use of multi-agent architecture to distribute the workload of detecting and solving conflicts between the aircraft and the UAV with no intervention from ground-based facilities. Midair collision risk was the main unsafe situation evaluated using an aircraft collision model based on air traffic density data.

关键词： Agents Air traffic control Aircraft control Autonomous vehicles computer controlled systems Detection algorithms Reliability Risk, Safety analysis

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A robust object shape prediction algorithm in the presence of white Gaussian noise

A robust object shape prediction algorithm in the presence o...

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International Conference on Multimedia Modeling (MMM)

作者： M. Khansari H.R. Rabiee M. Asadi M. Ghanbari Digital Media Laboratory Computer Engineering Department Sharif University of Technology Iran Department of Electronics System Engineering University of Essex UK

This paper presents a shape prediction algorithm in a noisy video sequence based on pixel representation in the undecimated wavelet domain. In our algorithm for tracking of user-defined shapes in a noisy sequence of images, the amplitude of coefficients in the best basis tree expansion of the undecimated wavelet packet transform are used as feature vectors (FVs). FVs robustness against noise has been achieved through inherent denoising and edge component separation in the best basis selection algorithm. The algorithm uses these FVs to track the pixels of small square blocks located at the vicinity of the object boundary. Searching for the best-matched block has been performed using conventional block matching algorithm in the wavelet domain. Our experimental results show that the algorithm is robust to noise in case of object's shape translation, rotation and/or scaling and can be used to track both rigid and non-rigid shapes in image sequences

关键词： Noise robustness Shape Prediction algorithms Gaussian noise Noise shaping Wavelet domain Video sequences Noise level Wavelet packets Wavelet transforms

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A Robust Object Shape Prediction Algorithm in the Presence of White Gaussian Noise

A Robust Object Shape Prediction Algorithm in the Presence o...

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The 12th International Multimedia Modelling Conference(MMM2006)

作者： M.Khansari H.R.Rabiee M.Asadi M.Ghanbari Digital Media Lab Computer Eng.DepartmentSharif University of Technology Department of Electronics System Engineering University of Essex

This paper presents a shape prediction algorithm in a noisy video sequence based on pixel representation in the undecimated wavelet *** our algorithm for tracking of user-defined shapes in a noisy sequence of images,the amplitude of coefficients in the best basis tree expansion of the undecimated wavelet packet transform are used as feature vectors (FVs).FVs robustness against noise has been achieved through inherent denoising and edge component separation in the best basis selection *** algorithm uses these FVs to track the pixels of small square blocks located at the vicinity of the object *** for the best-matched block has been performed using conventional block matching algorithm in the wavelet *** experimental results show that the algorithm is robust to noise in case of object's shape translation,rotation and/or scaling and can be used to track both rigid and nonrigid shapes in image sequences.

关键词： Object tracking Undecimated Wavelet Packet White Gaussian Noise Shape extraction

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An Effective Policy Management Framework Using RBAC model for Service Platform based on Components

An Effective Policy Management Framework Using RBAC model fo...

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International Conference on Software engineering Research, Management and Applications (SERA)

作者： Eun-Ae Cho Chang-Joo Moon Dae-Ha Park Doo-Kwon Baik Software System Laboratory Department of Computer Science & Engineering Korea University Seoul South Korea Department of Computer Science Konkuk University Chungju Chungcheongbuk South Korea Department of Computer and Information Science Korea Digital University Korea University Seoul South Korea

User access control is one of the core parts in the developing Internet field. However, in home network service platform and Web service platform, there is no concrete research yet. Therefore, in this paper, we propose the supplemented authorization policy management framework based on RBAC model in the network environment, especially, OSGi service platform and Web service platform. The proposed access control framework tries to enhance the efficiency, assure the privacy, and provide the convenience at the same time. In conclusion, we provide the base to implement the service platform by proposing the effective, safe and convenient framework in authorization and user administration part

关键词： Authorization Web services Access control Authentication Object oriented modeling Home automation Privacy computer science Environmental management Application software

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Access Control Policy Management Framework based on RBAC in OSGi Service Platform

Access Control Policy Management Framework based on RBAC in ...

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International Conference on computer and Information Technology (CIT)

作者： Eun-ae Cho Chang-joo Moon Dae-ha Park Doo-kwon Baik Software System Laboratory Department of Computer Science & Engineering Korea University of Technology and Education Seoul South Korea Department of Computer Science Konkuk University Chungju Chungcheongbuk South Korea Department of Computer and Information Science Korea Digital University Seoul South Korea

The OSGi provides a service platform which ensures the interoperability between heterogeneous technologies and various devices in home network environment. Nowadays, user access control is one of the core parts which should be cleared, but there are no concrete researches yet. So in this paper, we propose a supplemented authorization policy management framework based on RBAC (Role-Based Access Control) for user access control at home network environment in which the OSGi service platform is operated. The proposed access control framework improves effectiveness, assures privacy and provides convenience at the same time. In conclusion, we provide the base to implement the effective, safe, and convenient the OSGi service platform by proposing the new framework in authorization and user administration part.

关键词： Access control Home automation Authorization Privacy Consumer electronics Authentication computer science Concrete Environmental management Information technology

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Design and optimization on dynamic power system for self-powered integrated wireless sensing nodes

Design and optimization on dynamic power system for self-pow...

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2005 International Symposium on Low Power Electronics and Design

作者： Ma, Dongsheng Wang, Janet M. Somasundaram, Mohankumar N. Hu, Zongqi Integrated System Design Laboratory Electrical and Computer Engineering Department University of Arizona Tucson AZ 85721 United States Digital VLSI Design Laboratory Electrical and Computer Engineering Department University of Arizona Tucson AZ 85721 United States

This paper presents an integrated power system for low-power wireless sensor networks with dynamic efficiency optimization technique. By adaptively resizing power transistors and adjusting switching frequency, system efficiency is enhanced significantly. Theoretical analysis is elaborated to support the proposed technique. A prototype integrated power system for self-powered photovoltaic wireless sensing node was designed and simulated with TSMC 0.35μm CMOS process. With a power range of 0.5μW to 10mW, power efficiency stays above 71%. Tolerance between theoretical and simulated optimal power transistor sizes is less than 6.7%, while that of optimal switching frequencies is less than 5%. The paper gives another solution to minimizing system power in the perspective of power processing. Copyright 2005 ACM.

关键词： Power electronics

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Non-parametric ML channel estimator and detector for OFDM

Non-parametric ML channel estimator and detector for OFDM

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13th European Signal Processing Conference, EUSIPCO 2005

作者： Bhatia, Vimal Mulgrew, Bernard Falconer, David D. Institute for Digital Communications School of Engineering and Electronics University of Edinburgh Edinburgh EH9 3JL United Kingdom Broadband Communications and Wireless System Department of Systems and Computer Engineering Carleton University Ottawa ON K1S 5B6 Canada

ISBN: (纸本)1604238216

A maximum-likelihood channel estimator for the orthogonal frequency division multiplexing (OFDM) communication environments, in presence of interference is discussed here. We study a training based scenario, where the channel is estimated based on pilots that precede the transmission of the information. To reduce the number of estimation parameters, we estimate the channel iteratively in timedomain. Since interference from other users provides no useful information we do not estimate parameters of the interference and neither we neglect the affect of the interference instead interference along with Gaussian noise is perceived as non-Gaussian noise. The algorithm assumes no apriori knowledge about the interfering channel and signal at the receiver, further no-assumption on the statistical properties of the interferer is assumed which makes this algorithm robust. The estimated channel information along with the estimated distribution are then utilized to equalize the subsequent data blocks.

关键词： Orthogonal frequency division multiplexing

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