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ChinaGrid Annual Conference (ChinaGrid)

作者： Tiezhu Zhao Verdi March Shoubin Dong Simon See Guangdong Key Laboratory of Computer Network South China University of Technology Guangzhou China Asia-Pacific Science and Technology Center (APSTC) Sun MicroSystems Inc. Singapore Department of Computer Science National University of Singapore Singapore Department of Mechanical & Aerospace Engineering Nanyang Technological University Singapore

As a large-scale global parallel file system, Lustre file system plays a key role in High Performance Computing (HPC) system, and the potential performance of such systems can be difficult to predict because the potential impact to application performance is not clearly understood. It is important to gain insights into the deliverable Lustre file system IO efficiency. In order to gain a good understanding on what and how to impact the performance of Lustre file system. This paper presents a study on performance evaluation of Lustre file systems and we propose a novel relative performance model to predict overhead under different performance factors. In our previous experiments, we discover that different performance factors have a closed correlation. In order to mining the correlations, we introduce relative performance model to predict performance differences between a pair of Lustre file system equipped with different performance factors. On average, relative model can predict bandwidth within 17%-28%. The results show our relative prediction model can obtain better prediction accuracy.

关键词： File systems Performance evaluation Predictive models Correlation Bandwidth Sun Synthetic aperture sonar

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A Sports E-learning Platform: Teaching and learning by using Multimedia contents

A Sports E-learning Platform: Teaching and learning by using...

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IEEE International Conference on Ubi-Media Computing

作者： Chun-Hong Huang Chuan-Feng Chiu Su-Li Chin Li-Hua Hsin Yi-Pei Yu Department of Computer Information and Network Engineering Lunghwa University of Science and Technology Taiwan Department and Institute of Information Management Minghsin University of Science and Technology Taiwan Department of Physical Education Tamkang University Taiwan Physical Education Office Lunghwa University of Science and Technology Taiwan

ISBN: (纸本)9781424467082

The major purpose of this paper is to establish a Sports E-learning Platform in order to provide athletic related teaching materials, such as physical motions and exercise rules. The platform can integrate the Multimedia teaching materials which include video and 2D animation. Multimedia contents of teaching material not only increase the learning efficient but also the interesting of learning, especially in the area of Physical Education. The design concept of our works is based on ADDIE model of ISD (Instruction System Design) theory with the purposes of analysis, design, development, implementation, & evaluation. Via the usage of this physical education E-learning platform, we hope to let players perform efficient self learning for sports skills, indirectly foster mutual help, cooperation, nice norms of law-abiding via the learning of athletic rules, and become skilled at accurate recreation knowledge & first aid expertise. Moreover, coaches can use this system as a teaching facility.

关键词： Electronic learning Animation Educational technology Materials science and technology computer science education Multimedia systems Application software Physics computing Information management Learning systems

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Signal pre-processing method suitable for compressive sensing based on frequency modulation

Signal pre-processing method suitable for compressive sensin...

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International Conference on Signal Processing Proceedings (ICSP)

作者： Ruizhen Zhao Baogui Wang Wanjuan Lin Shaohai Hu Mingui Sun Institute of Information Science Key Laboratory of Advanced Information Science and Network Technology of Beijing Beijing Jiaotong University Beijing China Department of Electrical and Computer Engineering Laboratory of Computational Neuroscience University of Pittsburgh Pittsburgh PA USA

The sparse property of the signal to be processed is very important and directly affects the efficiency of compressive sensing. A signal pre-processing method suitable for compressive sensing is given, which is helpful to effective sensing and accurate reconstruction. Under the condition that the sparse characteristic of the signal is unknown, a frequency modulation pattern is introduced to pre-process the signal to increase the sparse proportion of the signal. Then we choose a difference matrix as the reconstruction matrix, the signal could be reconstructed accurately in the process of sparse reconstruction. Theoretical analysis and experimental results show that the proposed pre-processing method for compressive sensing is very effective and efficient.

关键词： Sparse matrices Compressed sensing Frequency modulation Discrete cosine transforms Sensors Image reconstruction

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On topology construction in layered P2P live streaming networks

On topology construction in layered P2P live streaming netwo...

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IEEE Symposium on network Operations and Management

作者： Runzhi Li Qishi Wu Yunyue Lin Xukang Lu Zongmin Wang College of Info Engineering University of Zhengzhou Zhengzhou Henan China Department of Computer Science University of Memphis Memphis TN USA Henan Prov. Key Lab on Info Network University of Zhengzhou Zhengzhou Henan China

ISBN: (纸本)9781424453665;9781424453672

Peer-to-peer (P2P) overlay networks provide a highly effective and scalable solution to live media streaming systems that require the collective use of massively distributed network resources. A P2P media streaming architecture is typically built completely or partially upon a tree-structured network topology and the process of tree construction has a significant impact on the overall system performance. We build network cost models and formulate a specific type of topology construction problem, Maximum Average Bandwidth Spanning Tree (MABST), which aims at optimizing the system's average stream rate. We prove that MABST is NP-complete by reducing from Hamiltonian Path problem and propose an efficient heuristic algorithm. The performance superiority of the proposed algorithm is justified by experimental results using a live media streaming system deployed in real networks and is also illustrated by an extensive set of simulations on simulated networks of various sizes in comparison with other methods based on a degree constraint or a greedy strategy.

关键词： network topology Streaming media Bandwidth Delay System performance Jitter Measurement Quality of service Tree data structures Buffer storage

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Error concealment for whole frame losses based on motion vectors estimation

Error concealment for whole frame losses based on motion vec...

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International Conference on Advanced computer Theory and engineering, ICACTE

作者： Bin Liao Jinlong Hu Minghui Du School of Electronic and Information Engineering South China University of Technology Mathematics Department South China Agriculture University Guangzhou China Communication and Computer Network Lab of Guangdong Province South China University of Technology Guangzhou China School of Electronic and Information Engineering South China University Technology Guangzhou China

Losing a packet will cause losing a whole frame in high compression and high payload video communication such as wireless low bit rate video transmission. In this paper, we present a novel technique which can deal with the problem of error concealment for whole frame losses. The proposed technique exploits objects motion information from video by combining gray and color optical flow methods to reconstruct lost images. After recovering main body of the lost frame, the MRF model is applied to deal with the overlap and occlusion caused by objects movements. Results show that the proposed technique provides good subject and object image quality and has a low complexity which make it can be used on real time operation.

关键词： Road transportation

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Four-level superradiant laser with full atomic cooperativity

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Physical Review A 2010年第5期81卷 053809-053809页

作者： Deshui Yu Jingbiao Chen Department of Applied Physics Graduate School of Engineering The University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University Beijing 100871 People's Republic of China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 People's Republic of China

We investigate a four-level superradiant laser whose intensity is proportional to N2 and whose linewidth scales as 1/N2. In the absence of spontaneous emissions, we derive the stationary solutions of the atomic full cooperativity, analyze their stabilities, and find the corresponding irreducible representation based on group U(4). We also investigate the spectra of the phase and amplitude fluctuations of the fields inside and outside the cavity and find that the amplitude fluctuations of the output fields cannot be squeezed in the low-frequency limit, which is completely different from the three-level superradiant laser system. Finally, we consider the stationary solutions corresponding to the partial cooperativity due to the symmetry breaking of U(4) induced by the atomic spontaneous emissions.

关键词： Spontaneous emission

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Low-complexity multiplexer-based normal basis multiplier over GF（2^m）

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2009年第6期10卷 834-842页

作者： Jenn-Shyong HORNG I-Chang JOU Chiou-Yng LEE Institute of Engineering Science and Technology National Kaohsiung First University of Science and Technology Department of Computer Information and Network Engineering Lunghwa University of Science and Technology

We present a new normal basis multiplication scheme using a multiplexer-based algorithm. In this algorithm, the proposed multiplier processes in parallel and has a multiplexer-based structure that uses MUX and XOR gates instead of AND and XOR gates. We show that our multiplier for type-1 and type-2 normal bases saves about 8% and 16%, respectively, in space complexity as compared to existing normal basis multipliers. Finally, the proposed architecture has regular and modular con-figurations and is well suited to VLSI implementations.

关键词： Finite field multiplication Normal basis Gaussian normal basis Elliptic curve cryptosystem

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Enhance Information Flow Tracking with Function Recognition

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China Communications 2010年第6期7卷 24-29页

作者： Zhou Kan Huang Shiqiu Huang Shan Qi Zhengwei Gu Jian Guan Haibing School of software Shanghai Jliao Tong University Shanghai 200240 P. R. China Key Lab of Information Network Security Ministry of Public Security Department of Computer Science ＆ Engineering Shanghai Jiao Tong University Shanghai 200240 P. R China Shanghai Key Laboratory of Scalable Computing ＆ System Shanghai P. R. China

With the spread use of the computers, a new crime space and method are presented for criminals. Thus computer evidence plays a key part in criminal cases. Traditional computer evidence searches require that the computer specialists know what is stored in the given computer. Binary-based information flow tracking which concerns the changes of control flow is an effective way to analyze the behavior of a program. The existing systems ignore the modifications of the data flow, which may be also a malicious behavior. Thus the function recognition is introduced to improve the information flow tracking. Function recognition is a helpful technique recognizing the function body from the software binary to analyze the binary code. And that no false positive and no false negative in our experiments strongly proves that our approach is effective.

关键词： function recognition information flow tracking program behavior e-evidence.

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Supporting variable dyad learning activities in an instructional game system

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International Journal of computers and Applications 2010年第3期32卷 267-274页

作者： Chou, C.-Y. Lin, C.-J. Lu, J.-L. Chan, T.-W. Department of Computer Science and Engineering Yuan Ze University No. 135 Yuan-Tung Road Chongli City Taoyuan County Taiwan Department of Learning and Digital Technology Fo Guang University No.160 Linwei Road Jiaosi Yilan County Taiwan Department of Computer Science and Information Engineering National Central University No. 300 Jhongda Road Chongli City Taoyuan County Taiwan Graduate Institute of Network Learning Technology National Central University No. 300 Jhongda Road Chongli City Taoyuan County Taiwan

This paper presents an instructional game system to support variable dyad learning activities for problem-solving exercises, particularly variable in difficulty level to make learning activities challenging and motivating for a wide range of people, or for the same person at different times. Furthermore, the system also allows teachers to adjust difficulty level of learning activities and to author the exercise problems. An instructional game is a highly motivating approach for reinforcing and exercising previously taught skills and concepts. This work uses dyad learning activities to mean synchronous learning activities involving two students who interact through a computer network. Variable dyad learning activities are developed by adjustment and combination of different factors, such as exercise problems, competition or collaboration, constraints on solving problems, and game scenarios. This paper describes the system design, adjustable factors, variable dyad learning activities, and a preliminary evaluation of the system.

关键词： Problem solving

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Parallel Molecular Dynamics Simulation of Lysozyme Hydration on IBM Blade Center Cluster

Parallel Molecular Dynamics Simulation of Lysozyme Hydration...

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2010 IEEE International Conference on Intelligent Computing and Intelligent Systems(2010 IEEE 智能计算与智能系统国际会议 ICIS 2010)

作者： Feng Sha Ying Wei Tao Wei Network Information Center Xiamen University of Technology Xiamen China Department of Computer and Science Xiamen University Tan Kah Kee College Xiamen China Materials Research Science & Engineering Center Northwestern University Evanston IL 60208 USA

A new Beowulf Clusters with IBM blade HS22 and DELL PC 755 has been built to perform parallel atomistic MD simulations. Lysozyme hydration was used as a model system to evaluate the system performance with different numbers of CPUs and nodes with AMBER suite. The efficiency reaches around 70％ of the theoretical value. From our simulation, about 771 water molecules are found to be bound on lysozyme surface at 300K within the first hydration shell within first hydration shell.

关键词： Parallel Atomistie MD Simulation Bewulf Culstetrs AMBER Lysozyme Hydration

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