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2008 International Conference on Wireless Networks, ICWN 2008

作者： Uddin, Mohammad Mesbah Zabir, Salahuddin Muhammad Salim Nohara, Yasunobu Yasuura, Hiroto Department of Computer Science and Communication Engineering Kyushu University Fukuoka Japan System LSI Research Center Kyushu University Fukuoka Japan

ISBN: (纸本)1601320914

Authentic program modification is very important for a multi-application smart card system since applications in the system are realized after the issuance of the smart card. In this paper, we propose a framework for such authentic program modification. In our framework, before issuing a smart card to an individual, the card issuer stores a unique long bit string called PID on the card. From the PID, unique substrings (subPIDs) are generated and used for different authentication purposes. The program modification protocol utilizes the subPIDs along with a one-way hash function and a pseudo random number generator function to verify the identity of the parties and the authenticity of the program. Our proposed framework provides a simple and practical solution to the program modification problem by avoiding direct interaction between the card holder and the issuer. In addition, use of hash functions makes the implementation cost of smart cards low.

关键词： Smart cards

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Discharge processes, electric field, and electron energy in ISUAL recorded gigantic jets

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Journal of Geophysical Research: Space Physics 2009年第4期114.0卷

作者： Kuo, Cheng-Ling Chou, J.K. Tsai, L.Y. Chen, A.B. Su, H.T. Hsu, R.R. Cummer, S.A. Frey, H.U. Mende, S.B. Takahashi, Y. Lee, L.C. Department of Physics National Cheng Kung University Tainan 70101 No. 1 University Road Taiwan Institute of Space Science National Central University Jhongli City Taoyuan County 32001 No. 300 Jhongda Road Taiwan Institute of Space Astrophysical and Plasma Sciences National Cheng Kung University Tainan Taiwan Earth Dynamic System Research Center National Cheng Kung University Tainan Taiwan Department of Electrical and Computer Engineering Duke University Durham NC United States Department of Electrical and Computer Engineering Duke University Box 90291 Durham NC 27708 United States Space Sciences Laboratory University of California Berkeley CA 94720 7 Gauss Way United States Department of Geophysics Tohoku University Aramaki Aoba-ku Sendai Miyagi 980-8578 6-3 Aza-aoba Japan

This article reports the first high time resolution measurements of gigantic jets from the Imager of Sprites and Upper Atmospheric Lightning (ISUAL) experiment. The velocity of the upward propagating fully developed jet stage of the gigantic jets was ∼10⁷ m s^-1, which is similar to that observed for downward sprite streamers. Analysis of spectral ratios for the fully developed jet emissions gives a reduced E field of 400-655 Td and average electron energy of 8.5-12.3 eV. These values are higher than those in the sprites but are similar to those predicted by streamer models, which implies the existence of streamer tips in fully developed jets. The gigantic jets studied here all contained two distinct photometric peaks. The first peak is from the fully developed jet, which steadily propagates from the cloud top (∼20 km) to the lower ionosphere at ∼90 km. We suggest that the second photometric peak, which occurs ∼lms after the first peak, is from a current wave or potential wave-enhanced emissions that originate at an altitude of ∼50 km and extend toward the cloud top. We propose that the fully developed jet serves as an extension of the local ionosphere and produces a lowered ionosphere boundary. As the attachment processes remove the charges, the boundary of the local ionosphere moves up. The current in the channel persists and its contact point with the ionosphere moves upward, which produces the upward surging trailing jets. Imager and photometer data indicate that the lightning activity associated with the gigantic jets likely is in-cloud, and thus the initiation of the gigantic jets is not directly associated with cloud-to-ground discharges. Copyright 2009 by the American Geophysical Union.

关键词： gigantic jet ISUAL FORMOSAT-2

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A novel approach for multimedia information hiding using visual cryptography

A novel approach for multimedia information hiding using vis...

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8th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2008

作者： Abdallah, Moussa H. Al-Dallah, Randa A. Al-Khalid, Rola I. Department of Electronics Engineering Princess Sumaya University for Technology Amman Jordan Computer Science Department Al-Balqa Applied Univeristy Salt Jordan Department of Computer Information System University of Jordan Amman Jordan

ISBN: (纸本)9780889867598

In this paper, a novel approach is presented for multimedia information hiding using visual cryptography. The approach combines both the steganographic and cryptographic effect to improve the quality of security of the data. The technique provides three levels of security without reducing the payload and the image quality. In order to attain even better quality, an enhancement technique is proposed. The experiments done on various images and the results obtained showed the robustness of the technique.

关键词： Bandpass filters

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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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Providing continuous VCR function with interpolated active buffer management for near VoD system on ubiquitous multimedia environment

Providing continuous VCR function with interpolated active b...

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2008 the 1st IEEE International Conference on Ubi-Media Computing and Workshops, U-Media2008

作者： Tsai, Hsien-Ming Ding, Jen-Wen Cheng, Shu-Chen Huang, Yueh-Min Department of Engineering Science National Cheng-Kung University China Management of Information System National Kaohsiung University of Applied Science China Dept. of Computer Science and Information Engineering Southern Taiwan University of Technology China

ISBN: (纸本)9781424418657

A unicast video-on-demand (VOD) system is good at interactivity but bad at scalability. Many multicast schemes have been proposed to solve the scalability problem in recent years. However, the weakness of these schemes are lack of interactivity. Furthermore, most multicast schemes rely on a large number of buffer and bandwidth to prefetch a large portion of video content in order to keep the video can be playing back smoothly. There is no doubt that this will be a great challenge to the ubiquitous VoD environment. In this paper, we propose a buffer interpolation algorithm and a hybird channel scheme to reduce the requirement of client buffer and decrease the user service latency time. Simulation results show that the proposed scheme not only keep the video playing smoothly under less buffer, but also present quite good performance in the aspect of VCR action. © 2008 IEEE.

关键词： Video on demand

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Using self Organizing Maps and nearest-neighbor to Data Clustering

Using self Organizing Maps and nearest-neighbor to Data Clus...

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2008 International Conference on Artificial Intelligence, ICAI 2008 and 2008 International Conference on Machine Learning;Models, Technologies and Applications, MLMTA 2008

作者： Boscarioli, Clodis Hernandez, Emilio Del Moral Da Silva, Leandro Augusto Department of Computer Science West Paraná State University Cascavel PR Brazil Department of Electronic System Engineering Polytechnic School University of São Paulo SP Brazil

ISBN: (纸本)1601320728

The data analysis involves the performance of different tasks, which can be performed by many different techniques and strategies. This research emphasizes the performance of the Data Clustering task using the artificial neural network Self-Organizing Maps as the main artifact. SOM is an Artificial Neural Network based in a competitive unsupervised learning, what implies in the training being entirely guided by the data and the neurons of the map compete among themselves. This neural network has the ability to form mappings that quantify the data, preserving its topology. This work introduces a new methodology of data clustering since SOM, that considers the topological map generated by him and the data topology in the clustering process, once considers the neighborhood of the input data.

关键词： Self organizing maps

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Tool support for the design of self-optimizing mechatronic multi-agent systems

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International Journal on Software Tools for Technology Transfer 2008年第3期10卷 207-222页

作者： Burmester, Sven Giese, Holger Münch, Eckehard Oberschelp, Oliver Klein, Florian Scheideler, Peter Software Engineering Group Department of Computer Science University of Paderborn Paderborn Germany System Analysis and Modeling Group Hasso Plattner Institute University of Potsdam Potsdam Germany Control Engineering and Mechatronics University of Paderborn Paderborn Germany Heinz Nixdorf Institute University of Paderborn Paderborn Germany

Complex technical systems, such as mechatronic systems, can exploit networking as well as the computational power available today to achieve an automatic improvement of the technical system performance at run-time through self-optimization. To realize this vision, appropriate means for the design of such self-optimizing mechatronic systems are required. Well-established techniques and tools for the modeling of cognitive behavior, reflective behavior, and control behavior exist. However, to really enable self-optimization and its full potential, these different aspects have to be safely integrated in a manner that remains comprehensible to the designer. In this article, we present how this required integration has been realized at the semantic level by extending the unified modeling language (UML), and at the tool level by integrating the CAE tool CAMeL and the CASE tool Fujaba real-time tool suite. The presented Mechatronic UML approach supports the design of verifiable, complex, reconfigurable mechatronic systems using the multi-agent system metaphor. © Springer-Verlag 2008.

关键词： Multi agent systems

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Igital redesign of the decentralized adaptive control for linear large-scale systems with actuator faults

Igital redesign of the decentralized adaptive control for li...

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10th IASTED International Conference on Control and Applications, CA 2008

作者： Tsai, J.S.H. Lin, M.H. Guo, S.M. Sun, P.Y. Shieh, L.S. Liu, C.R. Department of Electrical Engineering Control System Laboratory National Cheng Kung University Tainan 701 Taiwan Department of Computer Science and Information Engineering National Cheng Kung University Tainan 701 Taiwan Department of Electrical and Computer Engineering University of Houston Houston TX 77204-4005 United States

ISBN: (纸本)9780889867468

A novel digital redesign of the analog model-reference-based decentralized adaptive controller is proposed for the sampled-data large scale system consisting of N interconnected linear subsystems with actuator faults. The adaptation of the analog controller gain is derived by using the model-reference adaptive control theory based on Lyapunov method. In this paper, it is shown that the sampled-data decentralized adaptive control system is theoretically possible to asymptotically track the desired output with a specified performance even when actuator faults occur. Then, a method of actuator fault recovery is proposed. With the estimated faults, one can use the proposed input compensation method to solve actuator faults. In this paper, we also introduce a prediction-based digital redesign method to develop the corresponding sampled-data controller for the sampled-data decentralized adaptive control systems.

关键词： Lyapunov methods

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Partitioning strategy for embedded multiprocessor FPGA systems

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作者： Lee, Trong-Yen Fan, Yang-Hsin Cheng, Yu-Min Tsai, Chia-Chun Hsiao, Rong-Shue Department of Electronic Engineering Institute of Computer and Communication Engineering National Taipei University of Technology Taipei Taiwan Information System Section of Library National Taitung University Taitung Taiwan Chroma Corporation Taiwan Department of Computer Science and Information Engineering Nanhua University Chia-Yi Taiwan

ISBN: (纸本)9780387749341

Nanometer technology is gradually being applied after deep submicron technology due to the rapid progress of the VLSI fabrication process. Recently, system- on-a-chip (SoC) based products are gaining more advantages such as lower cost and power and high performance, but the new challenges are spending effort on hardware-software codesign, co-verification, and reusable intelligent property (IP). Moreover, the new fabrication process enhances transistor capacity greatly so that built-in multiprocessor system-on-a-chips (MPSoC) such as Xilinx [1] Virtex series FPGA platform are possible. Unfortunately, SoC's challenges are not solved completely;the MPSoC era is coming. Why is technology moving toward MPSoC? The reason is that the characteristic of MPSoC is simpler and more flexible than other architectures. For example, MPSoC-based architecture is easier for floating-pointoperation than redesigned hardware architecture. For computing mass and complex data, MPSoC is made more flexible by running software in parallel as opposed to hardware. © 2008 Springer science+Business Media, LLC.

关键词： Field programmable gate arrays (FPGA)

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String kernels with feature selection for SVM protein classification

String kernels with feature selection for SVM protein classi...

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6th Asia-Pacific Bioinformatics Conference, APBC 2008

作者： Yang, Wen-Yun Lu, Bao-Liang Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Laboratory for Computational Biology Shanghai Center for System Biomedicine Shanghai 200240 China

ISBN: (纸本)9781848161085

We introduce a general framework for string kernels. This framework can produce various types of kernels, including a number of existing kernels, to be used with support vector machines (SVMs). In this framework, we can select the informative subsequences to reduce the dimensionality of the feature space. We can model the mutations in biological sequences. Finally, we combine contributions of subsequences in a weighted fashion to get the target kernel. In practical computation, we develop a novel tree structure, coupled with a traversal algorithm to speed up the computation. The experimental results on a benchmark SCOP data set show that the kernels produced by our framework outperform the existing spectrum kernels, in both efficiency and ROC50 scores.

关键词： Support vector machines

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