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2007 International Symposium on Communications and Information Technologies (ISCIT 2007), vol.3

作者： Mahasak Ketcham Sartid Vongpraphip Digital System Engineering Laboratory Department of Computer Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand Digital System Engineering Laboratory Department of Computer Engineering Faculty Engineering Chulalongkom University Bangkok Thailand

This article presents the audio watermarking using multiple image-based watermarks based on genetic algorithms (GA) in the discrete wavelet transforms is proposed. Rather than using one watermark into a whole length of audio, we select appropriate watermarks in order to embed it into selected parts. It is robust against watermarking attacks, which are commonly employed in literature. In addition, the watermarked image quality is also considered. We employ GA for the optimal localization of watermark. The watermark detection process can be performed without using the original audio signal. The experimental results demonstrate that watermark is inaudible and robust to many digital signal processing, such as cropping, low pass filter, additive noise.

关键词： Watermarking Genetic algorithms Information technology Multimedia systems Internet Large-scale systems Copyright protection Cryptography Optimization methods Steganography

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A distributed wearable system based on multimodal fusion

A distributed wearable system based on multimodal fusion

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3rd International Conference on Embedded Software and systems, ICESS 2007

作者： Cho, Il-Yeon Sunwoo, John Jeong, Hyun-Tae Son, Yong-Ki Ahn, Hee-Joong Lee, Dong-Woo Han, Dong-Won Lee, Cheol-Hoon Digital Home Research Division Electronics and Telecommunications Research Institute Daejeon Korea Republic of System Software Laboratory Department of Computer Engineering Chungnam National University Daejeon Korea Republic of

ISBN: (纸本)3540726845

Wearable computer can be worn anytime with the support of unrestricted communications and variety of services which provides maximum capability of information use. Key challenges in developing such wearable computers are level of comfort that users do not feel what they wear, easy and intuitive user interface and power management technique. This paper suggests a wearable system that consists of a wristwatch-type gesture recognition device and a personal mobile gateway that functional input/output modules can be freely plugged in and taken out. We describe our techniques implemented during our wearable system development: 1) multimodal fusion engine that recognizes voice and gesture simultaneously, 2) power management technique and 3) gesture recognition engine. Finally, we evaluate the performance of our multimodal fusion engine, and show the power consumption measurement data of our system built with the power management technique. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Distributed computer systems

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Signal transition graph based logic synthesis for asynchronous control circuits using template based method

Signal transition graph based logic synthesis for asynchrono...

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IEEE Region 10 International Conference TENCON

作者： Sufian Sudeng Arthit Thongtak Digital System Engineering Laboratory (DSEL) Department of Computer Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand

This paper proposes an approach for reducing additional signals in signal transition graph (STG) based logic synthesis for asynchronous control circuits. The proposed scheme introduces a template based method in state encoding process to insert additional signals to STG with a small number. According to our method, complete state coding (CSC) property can be satisfied without using state graph tracing which is used in classical state based method. Our method is useful for large scale asynchronous controllers, and also it can guarantee the other relevant properties, such as persistency and consistency. Our process begins with an encoding STG using Petri-net level in order to form a template STG. Then the projection to each non-input signals from an original STG is done. After that, we trace the projection to smaller state space. If the small state space shows conflicts, we have to insert balance signals from template STG. Unbalance signals are inserted after in case the space still shows conflicts. Finally, we can get the STG with appropriate insertion points which is used to be projected for CSC support on each non-input signals. Asynchronous DMA controller is an example of our proposed method. The final part of this paper is concluded with a complexity comparison between our template based method with state based method and structural encoding method. It shows that the number of iterative signal removal according to our method is less than others.

关键词： Logic circuits Circuit synthesis Signal synthesis Encoding Control system synthesis Large-scale systems State-space methods Hazards Signal generators digital systems

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Survival Architecture for Distributed Intrusion Detection system (dIDS) using Mobile Agent.

Survival Architecture for Distributed Intrusion Detection Sy...

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IEEE International Symposium on Network Computing and Applications

作者： Sartid Vongpradhip Wichet Plaimart Department of Computer Engineering Faculty of Engineering Chulalongkom University Thailand Digital System Engineering Laboratory DSEL Department of Computer Engineering Faculty of Engineering Chulalongkom University Thailand

The attacking of the infrastructure of the computer network is seems to be one of the major problems. The increasing number of the Internet user all over the world comes with the risk that occurs from many network threats. One of the major tools for protecting the network attacking is the intrusion detection system (IDS), which make the system being the first target that will be attacked by the intruder. As we cannot avoid them, the problem is when there is an attack, how does the intrusion detection system survived. In this research, we show the restriction of the present intrusion detection system architecture and propose the new architecture that can handle the attack via the network and survive from it, using the mobile agent technology with the network topology design that hides the main resource of the network behind the intrusion detection system which separates network resource into segments and installs the monitored host onto each of network segment for robustness from all pattern of the attacking. The design avoid the single point of failure, shadow agent, together with proxy agent, fast backup and recovery mechanism, multicast group and the encryption of the communication between all the IDS for the network security.

关键词： Intrusion detection Mobile agents computer architecture computer networks IP networks Protection Network topology Condition monitoring Robustness Cryptography

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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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Walking Phase Recognition for People with Lower Limb Disability

Walking Phase Recognition for People with Lower Limb Disabil...

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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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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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