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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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New method of principle component analysis in network traffic

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Jisuanji Gongcheng/computer engineering 2005年第19期31卷 54-55+66页

作者： Zhang, Bingyi Lan, Julong Bian, Yulan Sun, Yamin Li, Yufeng Zhang, Hongke College of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 China Department of Computer Science Nanjing University of Science and Technology Nanjing 210094 China National Digital Switching System Engineering and Technological Research Center Zhengzhou 450002 China College of Information Science and Technology Wuhan University of Science and Technology Wuhan 430081 China

Traditional analysis method for network traffic is the scaled range statistic function (R/S). The results of R/S are not exact and cannot give an accurate judgment of whether the traffic model fitting actual traffic. In this paper the principle component analysis is imported into the network traffic analysis. It is used in computing Hurst parameter and analyzing the data based on different traffic model. It is used in analyzing the data based on the same traffic model with different parameters also. This method is useful and can conveniently give an accurate judgment for complex network traffic trace.

关键词： Network traffic analysis Principle component analysis Scaled range statistic function Traffic model

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Rotation, scale, and translation resilient digital watermarking based on complex exponential function

Rotation, scale, and translation resilient digital watermark...

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IEEE Region 10 International Conference TENCON

作者： S. Pholsomboon S. Vongpradhip Digital System Engineering Laboratory Department of Computer Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand

In this paper, a novel digital image watermarking scheme has been proposed based on spread spectrum technique. By exploiting complex exponential function to generate a multiple-rings shaped pattern, the watermark is invariant to rotation and translation, and resilient to scaling without truly inverse transformations needed. The proposed technique is performed in regular frequency domain without additional log-polar mapping required which can reduce computational complexity of such transformation. Furthermore, the original image is not needed for detection in this technique. Experimental results demonstrate performance of the proposed scheme that the watermark is correctly detected although the image was undergone by geometric and non-geometric transforms.

关键词： Watermarking Discrete Fourier transforms Spread spectrum communication Frequency domain analysis digital images Shape digital systems systems engineering and theory Laboratories Computational complexity

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A bandwidth reduction scheme for 3D texture-based volume rendering on commodity graphics hardware

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International Conference on Computational Science and its Applications, ICCSA 2004

作者： Lee, Won-Jong Park, Woo-Chan Kim, Jung-Woo Han, Tack-Don Yang, Sung-Bong Neelamkavil, Francis Media System Laboratory Department of Computer Science Yonsei University Seoul120-749 Korea Republic of School of Computer Engineering Department of Internet Engineering Sejong University Seoul143-747 Korea Republic of Digital Media R and D Center Samsung Electronics 416 Maetan-3Dong Paldal-Gu Suwon City442-742 Korea Republic of

ISBN: (纸本)3540220569

In this paper, we propose a bandwidth-effective volume rendering scheme which subdivides the volume into the sub-volumes and transmits them to the texture units in visibility order. Each sub-volume is rendered in the same manner as the original volume on the graphics hardware and the corresponding sub-image is blended in the alpha blending unit. The sub-volume oriented processing improves the cache efficiency and allows empty space skipping. Moreover, it is capable of rendering volume datasets that do not fit into the texture memory. Simulations show that the proposed scheme is effective for 3D texture-based volume rendering on commodity graphics hardware by reducing memory bandwidth up to 30 times when compared with the traditional method. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Volume rendering

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Integrating MPEG-7 descriptors and pattern recognition: an environment for multimedia indexing and searching

Integrating MPEG-7 descriptors and pattern recognition: an e...

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Proceedings of the Latin American Web Congress (LA-Web)

作者： R. Matushima D.M. Hiramatsu R.M. Silveira W.V. Ruggiero C.E.M. da Costa M.M. Monteiro C. Hatori LARC-Laboratory of Computer Architecture and Networks Department of Computer and Digital System Engineering Escola Politécnica da Universidade de São Paulo Brazil Department of Computer Engineering and Digital System Escola Politécnica da Universidade de São Paulo Brazil Fundaćão Padre Anchieta Radio e TV Cultura Sao Paulo Brazil

This paper describes a music searching system based on an automatic indexing process created over a pattern recognition tool and MPEG-7 standard. We present a complete analysis of the involved technologies integration process and show a reference measure in the feasibility of this kind of application not only in the research environment but also in the production of real systems.

关键词： MPEG 7 Standard Pattern recognition Indexing TV Data mining computer networks digital systems systems engineering and theory Libraries Humans

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A Solution to Shape Optimization Problems for the Rigidity Design of Plate and Shell Structures

A Solution to Shape Optimization Problems for the Rigidity D...

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The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational MechanicsⅠ

作者： Masatoshi Shimoda Jiro Tsuji Yasuhiro Kanda Hisayuki Ishizu Hideyuki Azegami Department of Mechanical Design Engineering Shonan Institute of Technology 1-1-25 Tsujido-nishikaigan Fujisawa 251-8511 Japan Development Planning Department Mitsubishi Automotive Engineering Co. Ltd. 1 Nakashinkiri Hashime-cho Okazaki -444-8501 Japan Okazakilst System Department MMC Computer Research Ltd. 1 Nakashinkiri Hashime-cho Okazaki 444-8501 Japan Digital Technology Dept. Mitsubishi Motors Corp. Hashime-cho Okazaki 444-8501 Japan Dept. of Complex Systems Science Nagoya University Chigusa-ku Nagoya 464-8601 Japan

Plate and shell structures are widelyused in industrial products and structures such as automotives, vessels and architectures for its good formability and lightweight property. This paper presents a numerical shape optimization method for the rigidity design of plate and shell structures. A solution to a compliance minimization problem subject to a volume constraint is proposed, and its reciprocal problem is also solved. The boundaries are assumed to be movable in the in -plane directions so as to keep the initial curvatures in the design domain. For simplicity, the structures to be optimized are discretized by plane elements based on the Mindlin-Reissner plate theory. The problems are formulated as non-parametric, or distributed shape optimization problems involving the design of free boundaries. The shape gradient functions are theoretically derived using the material derivative method and the Lagrange multiplier method. With the shape gradient function, the smooth domain variation that minimizes the objective functional is de termined by the traction method developed by the authors. The validity and practical utility of this numerical solution for the rigidity design of plate and shell structures are verified through simple examples and applications to automotive components.

关键词： Shell A Solution to Shape Optimization Problems for the Rigidity Design of Plate and Shell Structures Shape

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RJSSIM: A reconfigurable job scheduling smulator for parallel processing learning

RJSSIM: A reconfigurable job scheduling smulator for paralle...

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Frontiers in Education (FIE) Conference

作者： L.FW. Goes C.A.P.S. Martins Electrical Engineering Computational and Digita Systems Laboratory Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil Computer Science Department Elechical Engineering Computational and Digital System Laboratory Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil

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