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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Kun-Ming Yu Jiayi Zhou Cheng-Yan Yu Jian-Yuan Liu Chi-Chung Lee Hsin-Wen Chang Hung-Nien Hsieh Department of Computer Science and Information Engineering Chung Hua University Taiwan Institute of Engineering and Science Chung Hua University Taiwan Department of Information Management Chung Hua University Taiwan Department of Leisure and Recreation Management Chung Hua University Taiwan Department of Architecture and Urban Planning Chung Hua University Taiwan

Recreational cycling is a popular leisure activity in which the cyclist mostly is involved for a whole day at a time. This makes safety and comfort some of the most important factors to be attended to, especially when cycling in group. Group recreational cycling (GRC) is a new kind of tourism involving a courier and a number of tourists. Beside safety and comfort, tracking the cyclists, monitoring their health, and guiding and warning along the way are important in GRC. Information exchanging among cyclists is essential to achieve above goals. In this paper, an event-based wireless navigation and healthcare system for group recreational cycling (EWS) using an ad hoc network with multi-hop protocol to transmit data among devices is proposed. EWS can plan a route, warn about bad road conditions, play multimedia attractions for guiding, track cyclists and monitor their heart rate. Two scenarios were designed to observe and verify the feasibility of EWS.

关键词： Navigation Medical services Health and safety Ad hoc networks Spread spectrum communication Wireless application protocol Roads Condition monitoring Heart rate measurement Heart rate

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Robotics-mechatronics design competition in Kyushu area, Japan

Robotics-mechatronics design competition in Kyushu area, Jap...

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ICCAS-SICE 2009 - ICROS-SICE International Joint Conference 2009

作者： Sakaki, Taisuke Kiyota, Takanori Kino, Hitoshi Sagara, Shinichi Oguro, Ryuichi Moromugi, Shunji Imado, Keiji Ikeuchi, Hidetaka Fukushima, Manabu Ikeda, Takeshi Aoki, Kanta Ushimi, Nobuhiro Department of Engineering Kyushu Sangyo University Fukuoka Japan Department of Mechanical Systems Engineering University of Kitakyushu Kitakyushu Japan Department of Intelligent Mechanical Engineering Fukuoka Institute Technology Fukuoka Japan Department of Control Engineering Kyushu Institute of Technology Kitakyushu Japan Department of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Japan Department of Mechanical Systems Engineering Nagasaki University Nagasaki Japan Department of Architecture and Mechatronics Oita University Oita Japan Department of Media Technology Nippon Bunri University Oita Japan Department of Mechanical Engineering Kyushu University Fukuoka Japan Department of Art Kyushu Sangyo University Fukuoka Japan

ISBN: (纸本)9784907764296

We describe a unique competition based on the novel concept of robotics and mechatronics products that included evaluation of the products' engineering function and interface design. Seventy-seven students of eleven teams from seven universities in the Kyushu area participated in the competition, whose subject was " Health care, life supporting and communication or other technical aids for the elderly or disabled." Many of the plans presented ideas that balanced function and design, showing the results of collaboration among students studying engineering and students studying product design. © 2009 SICE.

关键词： Robotics

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Practical traceback mechanism in wireless sensor networks

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Tien Tzu Hsueh Pao/Acta Electronica Sinica 2009年第1期37卷 202-206页

作者： Yang, Feng Zhou, Xue-Hai Zhang, Qi-Yuan Xie, Jing Zhang, Shu-Guang Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 China Suzhou Institute for Advanced Study USTC Suzhou 215123 China Institute of Electronics and Information Engineering Anhui Institute of Architecture and Industry Hefei 230022 China

Sensor nodes can be compromised by attackers and inject large amounts of bogus data to exhaust network resources. A practical traceback mechanism is proposed, in which each forwarding node marks packets with a certain probability. By collecting enough packets, sink node will construct a path back to the source node. It is proved that the mechanism is secure against all forms of attacks and other two marking methods are proposed to improve the performance of the mechanism. Simulation results show that the mechanism is efficient and practical.

关键词： Sensor nodes

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Image analysis of Arabidopsis trichome patterning in 4D confocal datasets

Image analysis of Arabidopsis trichome patterning in 4D conf...

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IEEE International Symposium on Biomedical Imaging

作者： R. Bensch O. Ronneberger B. Greese C. Fleck K. Wester M. Hulskamp H. Burkhardt Institute of Computer Science Chair of Pattern Recognition and Image Processing Centre of Biological Signalling Studies (bioss) University of Freiburg Freiburg im Breisgau Germany Center of Biological Systems Analysis (ZBSA) University of Freiburg Germany Center of Biological Systems Analysis (ZBSA) Faculty of Biology University of Freiburg Germany Botanical Institute III University of Köln Germany

ISBN: (纸本)9781424439317

In this article, we present an approach for the automated extraction of quantitative information about trichome patterning on leaves of Arabidopsis thaliana. Time series of growing rosette leaves (4D confocal datasets, 3D + time) are used for this work. At first, significant anatomical structures, i.e. leaf surface and midplane are extracted robustly. Using the extracted anatomical structures, a biological reference coordinate system is registered to the leaves. The performed registration allows to determine intra- as well as inter-series spatiotemporal correspondences. Trichomes are localized by first detecting candidates using Hough transform. Then, local 3D invariants are extracted and the candidates are validated using a Support Vector Machine (SVM).

关键词： Image analysis Surface morphology Data mining Robustness Support vector machines Computed tomography Biology Anatomical structure Optimized production technology X-ray imaging

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Design of a flip-flop circuit within digital logic analyzer based on FPGA

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Harbin Gongye Daxue Xuebao/Journal of Harbin institute of Technology 2009年第SUPPL. 1期41卷 58-62页

作者： Xiao, Ling-Li Xu, Ning Han, Yin-He School of Computer Science and Technology Wuhan University Of Technology Wuhan 430070 China System Architecture Key Laboratory Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

With the wide application of EDA technique, the period for the development of electronic products has been shortened. That implements the software of the hardware design and reduces the costs. Based on the analysis of the principle of digital logic analyzer circuit, this paper discusses the working principles of its flip-flop circuit module and the implementation method of FPGA, and presents the program design and emulation result of part circuits.

关键词： Field programmable gate arrays (FPGA)

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Performance-aware speculation control using wrong path usefulness prediction

Performance-aware speculation control using wrong path usefu...

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2008 IEEE 14th International Symposium on High Performance computer architecture, HPCA 2008

作者： Chang, Joo Lee Kim, Hyesoon Mutlu, Onur Patt, Yale N. Department of Electrical and Computer Engineering University of Texas at Austin School of Computer Science Georgia Institute of Technology Computer Architecture Group Microsoft Research

ISBN: (纸本)9781424420704

Fetch gating mechanisms have been proposed to gate the processor pipeline to reduce the wasted energy consumption due to wrong-path (i.e. mis-speculated) instructions. These schemes assume that all wrong-path instructions are useless for processor performance and try to eliminate the execution of all wrong-path instructions. However, wrong-path memory references can be useful for performance by providing prefetching benefits for later correct-path operations. Therefore, eliminating wrong-path instructions without considering the usefulness of wrong-path execution can significantly reduce performance as well as increase overall energy consumption. This paper proposes a comprehensive, low-cost speculation control mechanism that takes into account the usefulness of wrong-path execution, while effectively reducing the energy consumption due to useless wrong-path instructions. One component of the mechanism is a simple, novel wrong-path usefulness predictor (WPUP) that can accurately predict whether or not wrong-path execution will be beneficial for performance. The other component is a novel branch-count based fetch gating scheme that requires very little hardware cost to detect if the processor is on the wrong path. The key idea of our speculation control mechanism is to gate the processor pipeline only if (1) the number of outstanding branches is above a dynamically-determined threshold and (2) the WPUP predicts that wrong-path execution will not be beneficial for performance. Our results show that our proposal eliminates most of the performance loss incurred by fetch gating mechanisms that assume wrong-path execution is useless, thereby both improving performance and reducing energy consumption while requiring very little (51-byte) hardware cost. ©2008 IEEE.

关键词： Energy utilization

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Meta-Service Organization for a Pervasive University

Meta-Service Organization for a Pervasive University

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IEEE International Conference on Pervasive Computing and Communications (PerCom)

作者： Raphael Zender Enrico Dressler Ulrike Lucke Djamshid Tavangarian Department of Computer Science Chair of Computer Architecture University of Rostock Rostock Germany Department of Computer Science Chair of Computer Architecture Rostock Germany

SOA services afford a uniform and transparent use of different devices with similar functionalities. In the last years a number of mostly incompatible, SOA technologies have been established. Therefore, this advantage is no longer true. Indeed it is not required to support the specific device, but the concrete SOA technology. Furthermore, a transparent service discovery is prevented by device interconnections because many SOA technologies use IP multicasts for a service discovery. The discovery range is limited on the consumer's subnet as the most routers don't route multi-casts. This article describes a service discovery approach, that is independent from concrete SOA technologies and device interconnections. That results in an increase of available services and the service discovery range.

关键词： Service oriented architecture Concrete Pervasive computing Web services computer science computer architecture Humans Electronic equipment Home automation Plugs

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COMBINED FRAGILE WATERMARK AND DIGITAL SIGNATURE FOR H.264/AVC VIDEO AUTHENTICATION

COMBINED FRAGILE WATERMARK AND DIGITAL SIGNATURE FOR H.264/A...

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European signal processing conference

作者： K. Ait Saadi A. Bouridane A. Guessoum Centre de Developpement des Technologies Avancees Division Architecture des Systemes Cite 20 Aout 1956 BP 17BabaHassen 16303 Alger Algerie. School of Electronics Electrical Engineering and Computer Science Institute of Electronics Communications and Infor-mation Technology Queen's University Belfast United Kingdom Universite Saad Dahlab Institut d'Electronique Route de Soumaa BP 270 Blida

ISBN: (纸本)9781617388767

Currently the demand of security is getting higher due to easy reproduction of digitally created multimedia data. Digital watermarking aims to embed secret information into content for copyright protection and authentication. This paper proposes a combined digital watermarking and digital signature based on video content to authenticate and to verify the integrity of the compressed H.264/AVC video. Features are extracted as the authentication data from transform domain to generate a unique digital signature using an MD5hash function. The authentication information treated as fragile watermark is embedded in a set of motion vectors belonging to higher motion activities with the best partition mode in a tree-structured motion compensation approach. Watermark detection is blind and does not require an original video. Experimental results show that the proposed watermarking technique can not only achieve the goal of fragility but also verify the authenticity and the integrity of the video.

关键词： Videotapes digital signatures Fragility motion vector Digital watermarking Authentication signatures

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Energy efficient implementation of G.729 for wireless VoIP application 08

Energy efficient implementation of G.729 for wireless VoIP a...

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2008 International Conference on Advanced Infocomm Technology, ICAIT '08

作者： Yao, Aihong Gu, Junjun Qu, Gang Bhattacharyya, Shuvra School of Computer Science and Technology and Institute for Computer Architecture Harbin Engineering University Harbin Heilongjiang China Electrical and Computer Engineering Department Institute for Advanced Computer Studies University of Maryland College Park MD United States

ISBN: (纸本)9781605580883

In this paper, we describe the formatting guidelines for ACM SIG Proceedings. Traditionally silence in VoIP applications is detected by a VAD algorithm after G.729 compression, both have high computational and energy cost. However, such cost on silence frames will be completely wasted because the detected silence frames will not be sent to receiver. We propose to use a silence pre-detection (SPD) module to detect silence frames directly from the voice sample in order to reduce energy. Our adaptive SPD algorithm has little hardware requirement and low computation cost. However, it can detect 59% of the silence, which results in 34% energy saving. The impact to quality of speech is almost unnoticeable. Copyright © 2008 ACM.

关键词： Energy efficiency

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A Self-Repairable Microprocessor

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ECS Transactions 2009年第1期18卷

作者： Yuanjiang Xie Xiang Fu Zijian He Yang Zhao Yu Hu Xiaowei Li Institute of Computing Technology Chinese Academy of Sciences Department of Computer Science and Engineering University of California Riverside Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences No. 6 Ke-Xue-Yuan South Road Beijing Beijing 100190 China

With increasing defect density, microprocessors, especially the embedded caches, will encounter more faults. Adding spare resources to replace defective components is a widely accepted method for yield enhancement. In this work, a repair method using content addressable memory combined with spare bits, as well as a novel fault injection method is proposed. With the proposed fault injection technique, various numbers and types of faults can be flexibly injected into the silicon. A wireless sensor network system using our self-repairable microprocessor (SRP) is developed to prove the effectiveness of the proposed technique.

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