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OFC/NFOEC 2007 - Optical Fiber Communication and the National Fiber Optic Engineers Conference 2007

作者： Dong, Yi Li, Zhaohui Yu, Changyuan Wen, Yang Jing Wang, Yixin Lu, Chao Hu, Weisheng Cheng, Tee Hiang State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University 800 Dongchuan Rd. Shanghai 200240 China School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore Institutes for Infocomm Research A STAR 21 Heng Mui Keng Terrace Singapore 119613 Singapore Dept. of Electrical and Computer Engineering National University of Singapore 4 Engineering Dr. 3 Singapore 117576 Singapore Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong Hong Kong

Fourteen C+L-band synchronized multi-channel short pulse sources are generated based on XPM and FWM effects in nonlinear optical loop mirror. Walk-off effect is reduced effectively by using 10m high nonlinear dispersi... 详细信息

ISBN: (纸本)1557528314

关键词： Optical systems

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Feature Selection and Partial Least Squares Based Dimension Reduction for Tumor Classification

Feature Selection and Partial Least Squares Based Dimension ...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Hua-Long Bu Guo-Zheng Li Xue-Qiang Zeng Jack Y. Yang Mary Qu Yang School of Computer Engineering & Science Shanghai University Shanghai China State Key Laboratory for Novel Software Technology Nanjing University Nanjing China Harvard Medical School Harvard University Cambridge MA USA U.S. Department of Health and Human Services Bethesda National Institutes of Health MD USA

Partial least squares (PLS) is one of the widely used dimension reduction methods for analysis of gene expression microarray data, it represents the data in a low dimensional space through linear transformation, the size of the reduced space by PLS is critical to generalization performance of classifiers. The previous works always determined the top fixed number of components or the top several components by cross-validation. Here we demonstrate the usage of feature selection for PLS based dimension reduction. As a case study, PLS is combined with two feature selection methods (genetic algorithm and sequential backward floating selection) to get more robust and efficient dimensional space, and then the constructed data from the selected components is used as input for the support vector machine (SVM) classifier. We use the method for tumor classification on gene microarray data, experimental results illustrate that our proposed framework is effective both to reduce classification error rates and get compact dimensional space.

关键词： Least squares methods Neoplasms Gene expression Support vector machines Support vector machine classification Feature extraction Data mining Humans Genomics Bioinformatics

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Support Vector Regression with Feature Selection for the Multivariate Calibration of Spectrofluorimetric Determination of Aromatic Amino Acids

Support Vector Regression with Feature Selection for the Mul...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Guo-Zheng Li Hao-Hua Meng Mary Qu Yang Jack Y. Yang School of Computer Science & Engineering Shanghai University Shanghai China State Key Laboratory for Novel Software Technology Nanjing University Nanjing China National Human Genome Research Institute U.S. Department of Health and Human Services National Institutes of Health DHHS Bethesda MD USA Harvard Medical School Harvard University Cambridge MA USA

Several artificial intelligent methods, including support vector regression (SVR), artificial neural networks (ANNs), and partial least square (PLS) are used for the multivariate calibration in the determination of the three aromatic amino acids (phenylalanine, tyrosine and tryptophan) in their mixtures by fluorescence spectroscopy. The results of the leave-one-out method show that SVR perform better than other methods, and appear to be good methods for this task. Furthermore, feature selection is performed for SVR to remove redundant features and a novel algorithm named PRIFER (prediction risk based feature selection for support vector regression) is proposed. Results on the above multivariate calibration data set show that PRIFER is a powerful tool for solving the multivariate calibration problems.

关键词： Calibration Amino acids Fluorescence Humans Bioinformatics Artificial neural networks Prediction algorithms Chemistry Kernel Spectroscopy

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Object identifier reuse mechanism for TOTEM 22

Object identifier reuse mechanism for TOTEM

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22nd International Conference on Data engineering Workshops, ICDEW 2006

作者： Shi, Yuan Zhai, Boxuan Zhou, Xiang Peng, Zhiyong State Key Lab of Software Engineering Computer School Wuhan University China

ISBN: (纸本)0769525717

During the development of our object deputy database system, called TOTEM, we find that OID exhaustion becomes a serious problem, which may also exist in other databases. To our knowledge, most current database systems don't reuse OIDs in the fear of destroying referential consistency, which, however, can get well resolved in our OID Reuse Mechanism with the help of bilateral pointers. This paper firstly introduces the basic concepts of OID, states the necessity and importance of OID Reuse, and then introduces the implementation of OID Reuse Mechanism in TOTEM. At last, its performance evaluation is presented. © 2006 IEEE.

关键词： Object deputy model Object identifier Reclamation Reuse

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System Dependence Graph Construction for Aspect Oriented C++

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 555-560页

作者： SHI Liang XU Baowen School of Computer Science and Engineering Southeast University Nanjing 210096 Jiangsu China State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 Hubei China

This paper proposes an extended system dependence graph called AspectSDG to represent control and data dependences for AspeetC＋＋ programs, and presents an approach for the construction of AspectSDG. This approach decomposes aspect-oriented programs into three parts： component codes, aspect codes, and weaving codes. It constructs program dependence graphs （PDGs） for each part, and then connects the PDGs at call sites to form the complete AspectSDG. The AspectSDG can deal with advice precedence correctly, and represent the additional dependences caused by aspect codes. Based on this model, we introduce how to compute a static slice of an AspectC＋＋ program.

关键词： program analysis system dependence graph aspect-oriented ,slicing

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Reconstructing the Nonlinear Dynamical Systems by Evolutionary Computation Techniques

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 520-524页

作者： LIU Minzhong KANG Lisha School of Computer Wuhan University Wuhan 430072 Hubei China State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 Hubei China

We introduce a new dynamical evolutionary algorithm（DEA） based on the theory of statistical mechanics and investigate the reconstruction problem for the nonlinear dynamical systems using observation data. The convergence of the algorithm is discussed. We make the numerical experiments and test our model using the two famous chaotic systems （mainly the Lorenz and Chen systems）. The results show the relatively accurate reconstruction of these chaotic systems based on observational data can be obtained. Therefore we may conclude that there are broad prospects using our method to model the nonlinear dynamical systems.

关键词： dynamical evolutionary algorithm nonlinear dynamical systems reconstruction

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On the quality of service of failure detectors based on control theory

On the quality of service of failure detectors based on cont...

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20th International Conference on Advanced Information Networking and Applications

作者： Xiong, Naixue Yang, Yan Chen, Jianxun He, Yanxiang School of Information Science Japan Advanced Institute of Science and Technology Japan Computer Science and Technology School Wuhan University of Science and Technology China State Key Lab of Software Engineering Computer School Wuhan University China

ISBN: (纸本)0769524664

The detection of failures is a fundamental issue for fault tolerance in distributed systems. Recently, many people have come to realize that failure detection ought to be provided as some form of generic service, similar to IP address lookup. However, this has not been successful so far;one of the reasons being the fact that classical failure detectors were not designed to satisfy several application requirements simultaneously. More specifically, traditional implementations of failure detectors are often tuned for running over local networks and fail to address some important problems found in wide-area distributed systems with a large number of monitored components. In this paper, we study the quality of service (QoS) of failure detectors. We first present a novel failure detector scheme combined with control theory that can help in solving or optimizing some problems. Furthermore, this paper discusses the design and analysis of implementing a scalable failure detection service for such large wide-area distributed systems considering dynamically adjusting the heartbeat streams, so that it satisfies the bottleneck router requirements. We further show how the online failure detector control algorithm can be used to design a controller, analyze the theoretical aspects of the proposed algorithm and verify its agreement. Simulation results show the efficiency of our scheme in terms of high utilization of the bottleneck link fast response and good stability of the bottleneck router buffer occupancy as well as of the controlled sending rates. In conclusion, the new failure detector algorithm provides a better QoS than an algorithm that is proposed by Stelling et al [1, 2].

关键词： Telecommunication services

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Assigning block size based on speculation for parallel downloading

Assigning block size based on speculation for parallel downl...

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6th IEEE International Conference on computer and Information Technology, CIT 2006

作者： Fu, Jianming Fan, Hui School of Computer Science Wuhan University 430072 Wuhan China State Key Lab. of Software Engineering Wuhan University 430072 Wuhan China

ISBN: (纸本)076952687X

With the development of mirror sites, parallel downloading, which can decrease download latency, is becoming more and more popular. Dynamic parallel downloading can be adapted according to the fluctuation of network bandwidths, and has a better performance than static parallel downloading. To reduce the number of requesting document blocks, we propose a scheme in which block size is assigned based on speculation. It deals with the unbalance of assignments during downloading and decreases download latency effectively. Further more, we have implemented a parallel downloading prototype, which makes use of this scheme. Through experimental tests, this scheme shows its advantages of both download latency and the number of block assignments. © 2006 IEEE.

关键词： Parallel processing systems

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On control gain selection in PI-RED

On control gain selection in PI-RED

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2006 IEEE International Conference on Networking, Sensing and Control, ICNSC'06

作者： Naixue, Xiong Xavier, Defago Yan, Yang Yanxiang, He Jing, He Asahidai Nomi Ishikawa Japan State Key Lab. of Software Engineering Computer School Wuhan University China School of Information Science Japan Advanced Institute of Science and Technology Japan School of Computer Science and Technology Wuhan University of Science and Technology Hu Bei province China State Key Lab. of Software Engineering Computer School Wuhan University Hu Bei province China Department of Computer Science Utah State University Logan UT 84322-4205 United States

ISBN: (纸本)1424400651

Active Queue Management (AQM) is an effective method used in Internet routers to enhance congestion control, and to achieve a trade off between link utilization and delay. The de facto standard, the Random Early Detection (RED) AQM scheme, and most of its variants use queue length as a congestion indicator to trigger packet dropping. Random early detection (RED) is a widely studied active queue management (AQM) scheme implemented in routers for Internet congestion control. Although certain stability conditions for various RED controllers are discussed, no efficient method for dynamically adapting control gains or result on control gain optimization has been proposed so far. Therefore based on control theory, this paper proposes Proportional and Integral RED (PI-RED) algorithm, that not only considers the average queue length at the current time slot, but also takes into consideration the past average queue lengths within a round trip time. We provides guidelines for the selection of the feedback gains (the proportional parameter and the integral parameter) for TCP/RED system to stabilize the dynamics, make the congested queue converge at a certain target and hence to improve network performance. Simulations demonstrate that indeed satisfactory performance can be achieved if the control gains are selected based on the guidelines. Based on the stability condition and control gains selection method, extensive simulations with ns2 demonstrate that indeed satisfactory performance can be achieved in terms of robustness, drop probability and stability if the control gains are selected based on the guidelines. © 2006 IEEE.

关键词： Control system analysis

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Development of Trusted Computing Research

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Wuhan University Journal of Natural Sciences 2006年第6期11卷 1407-1413页

作者： ZHANG Huanguo LUO Jie JIN Gang ZHU Zhiqiang YU Fajiang YAN Fei School of Computer Wuhan University Wuhan 430072 Hubei China State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 Hubei China

Trusted computing is the new trend of information security today. This paper surveys the theory and technology of trusted computing. The development history of trusted computing, and the development of trusted computing in China are introduced in this paper, and then it analyzes some problems of trusted computing at present which are delay in theory research, some key technologies to be developed and lack of trusted software system. Some fields are worthy to be explored on are pointed out including key technology, basic theory and application in trusted computing.

关键词： computer trusted computing secure computer information security

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