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Self-healing optical access networks (SHOAN) operated by optical switching technologies

IEEE Transactions on Network and Service Management 2011年第3期8卷 234-244页

作者： Huang, Anpeng Liu, Siyu Xie, Linzhen Chen, Zhangyuan Mukherjee, Biswanath State Key Lab. of Advanced Optical Communication Systems and Networks China Wireless Communications Lab. PKU-UCLA Joint Research Institute Peking University Beijing 100871 China Department of Computer Science University of California Davis United States

An optical access network should offer low-cost reliable services to its end users. To address this problem, an optimal solution is needed which can turn an optical access architecture into a self-healing system. Hence, we propose the Self-Healing Optical Access Network (SHOAN), in which two or more optical access architectures are partners of each other, and they are interconnected by elementary optical crossbar switches into a simple mesh network. In SHOAN, the crossbar switches can keep each access architecture as an independent and closed system for only serving its own end users in normal state. But the crossbars become open in fault scenarios. Whenever a failure occurs in the network, the fault can be monitored and affected services can be recovered by the partner of the access architecture that is affected. Such an interconnected optical access network can withstand failures in its transmission paths, and recover network services in a self-healing way. Compared to existing solutions (e.g., dual-home architecture), illustrative examples demonstrate that SHOAN has many desirable properties: (1) it is robust because risks are disjointed, (2) it is reliable because service recovery is given top priority, and (3) it has low cost because redundant backup components are not necessary since the partner's resources act as backup resources. Analysis results show that SHOAN can minimize disruption duration and network cost for broadband access services. © 2011 IEEE.

关键词： Cost benefit analysis

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Empirical studies of pen tilting performance in pen-based user interfaces 11

Empirical studies of pen tilting performance in pen-based us...

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Proceedings of the 2011 Visual Information Communication - International Symposium

作者： Tian, Feng Cao, Xiang Lu, Fei Dai, Guozhong Zhang, Xiaolong Wang, Hongan Intelligence Engineering Lab. Institute of Software Chinese Academy of Sciences China Microsoft Research Asia China State Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences China Pennsylvania State University United States

ISBN: (纸本)9781450308755

Recently, pen tilting has been explored in pen-based user interfaces and has shown potential to improve user interaction in various tasks (e.g., menu selection, modeless object manipulation). However, some basic questions concerning pen tilting behaviors, such as the ideal range, azimuth size, and direction of pen tilting, have not been thoroughly investigated. In this paper, we report our empirical studies on user performances in basic pen tilting tasks. First, we conducted a baseline study, which helps us to determine tilting directions, tilting ranges, and the thresholds that separate incidental pen tilting actions from intentional actions used for interaction. Based on the results from the baseline study, we designed an experiment to investigate user performances in goal tilting in different tilting ranges, azimuth sizes, and directions. Drawing on the results of our data analyses on task completion time, error rate, and pen tip movements, we discussed values of tilting parameters like titling range, minimal azimuth size, and tilting direction. © 2011 ACM.

关键词： User interfaces

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Energy conservation using network coding in grid wireless sensor networks

Energy conservation using network coding in grid wireless se...

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International Workshop on Intelligent systems and Applications

作者： Kasireddy, Bharat Wang, Yun Liu, Jin Department of Computer Science Southern Illinois University Edwardsville IL United States State Key Lab. of Software Engineering Wuhan University China

ISBN: (纸本)9781424498574

This work investigates the energy consumption rate of an energy-constrained wireless sensor network and demonstrates that sensor energy dissipation can be reduced by employing network coding in terms of routing the same amount of sensing data to base stations through theoretical and simulation perspectives. In addition,this work examines the interplays between network parameters such as node density, traffic rate,and coding strategy and the performance gain of employing network coding for energy conservation in a grid wireless sensor *** provides insights into the design of wireless sensor networks and the deployment of network coding for energy conservation in practice. © 2011 IEEE.

关键词： Energy conservation

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Semi-supervised regression via parallel field regularization

Semi-supervised regression via parallel field regularization

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25th Annual Conference on Neural Information Processing systems 2011, NIPS 2011

作者： Lin, Binbin Zhang, Chiyuan He, Xiaofei State Key Lab. of CAD and CG College of Computer Science Zhejiang University Hangzhou 310058 China

ISBN: (纸本)9781618395993

This paper studies the problem of semi-supervised learning from the vector field perspective. Many of the existing work use the graph Laplacian to ensure the smoothness of the prediction function on the data manifold. However, beyond smoothness, it is suggested by recent theoretical work that we should ensure second order smoothness for achieving faster rates of convergence for semisupervised regression problems. To achieve this goal, we show that the second order smoothness measures the linearity of the function, and the gradient field of a linear function has to be a parallel vector field. Consequently, we propose to find a function which minimizes the empirical error, and simultaneously requires its gradient field to be as parallel as possible. We give a continuous objective function on the manifold and discuss how to discretize it by using random points. The discretized optimization problem turns out to be a sparse linear system which can be solved very efficiently. The experimental results have demonstrated the effectiveness of our proposed approach.

关键词： Supervised learning

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A method for detecting mismatch of time-aware Web services based on SMT

A method for detecting mismatch of time-aware Web services b...

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6th International Conference on computer science and Education, ICCSE 2011

作者： Xiyan, Wang Chen, Shenbiao Zhang, Guangquan Zhu, Jihan Wu, Jianfeng School of Computer Science and Technology Soochow University Suzhou 215006 China State Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100190 China

ISBN: (纸本)9781424497188

Considering the timed properties between the interactions of Web services, we model the Web services with timed properties formally and propose a method for detecting mismatch of time-aware Web services based on Satisfiability Modulo Theories (SMT) in this paper. The issue of detecting mismatch of Web services can be transformed into the problem of existence model checking whether a deadlock is reachable or not between the interaction of the services, and the issue of existence model checking can be transformed into the problem whether the logic formula is satisfiable or not. © 2011 IEEE.

关键词： Web services

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A real-time attitude recognition by eye-tracking 11

A real-time attitude recognition by eye-tracking

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3rd International Conference on Internet Multimedia Computing and Service, ICIMCS 2011

作者： Lv, Yanpeng Wang, Shangfei Shen, Peijia Key Lab. of Computing and Communicating Software of Anhui Province School of Computer Science and Technology University of Science and Technology of China Hefei Anhui China

ISBN: (纸本)9781450309189

Attitude, which is the outward manifestation of human psychology information, is inevitable in everyday situation. Attitude recognition by artificial intelligence has become a hotspot and produced promising results in recent years. In this paper, we propose an attitude recognition method based on eye-tracking. We first improve the eye location algorithm in OpenCV and assume that the trajectory of eyes-center is the same with that of head. Then using eye location method, the center of eyes is calculated. By analysis of displacement of eyes' centers in each two successive frames, sub-result is obtained. The final result is determined by voting algorithm. Experimental results indicate that this method could recognize positive and negative attitudes in real time. We applied our method to "KeJia", an intelligent service robot and it worked well. © 2011 ACM.

关键词： Eye tracking

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High speed architecture of arithmetic coder

High speed architecture of arithmetic coder

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IEEE International Conference on computer science and Automation Engineering (CSAE)

作者： Liu, Kai Xu, Chao School of Computer Science and Technology Xidian University Xi'an 710071 China State Key Lab. for Novel Software Technology Nanjing University Nanjing 210093 China

ISBN: (纸本)9781424487257

A high speed arithmetic coder architecture is proposed in this paper. An out-of-order execution mechanism for different types of context is used that can allocate the context symbol to the idle arithmetic coding core with a different order compared with the input order. For the balance of the input rate of contexts, in one arithmetic coder, there exist N cores for processing different contexts, where N is the number of context type. Furthermore, the same bit detection (SBD) circuit is used for unrolling the renormalization stage of arithmetic coding. Moreover, because of time consuming for underflowing, a dedicated circuit is designed to unrolling the internal loop which can process underflowing situation in a few clock cycles. Experimental results demonstrate that the proposed architecture attains a throughput of 375.50 MCPS (Mega Contexts per Second) at its maximum based on field programmable gate arrays (FPGAs). © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Test case generation based on program invariant and adaptive random algorithm

Test case generation based on program invariant and adaptive...

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2011 International Conference on computer science and Education, CSE 2011

作者： Yuan, Yuan Fanping, Zeng Guanmiao, Zhu Chaoqiang, Deng Neng, Xiong Department of Computer University of Science and Technology of China China Anhui Province Key Lab. of Software in Computing and Communication Hefei Anhui China

ISBN: (纸本)9783642224171

Testing is a critical activity to find software errors. And choosing an effective test suite is the key problem in software testing area. Program invariant, as an attribute of program, can record the implementation state of test case very well and reveal the coverage of program data. In this paper, we integrate adaptive random testing and invariant technology, and present a new method which makes full use of the feedback information of program invariant and invalid case suite to generate the next case. Experiment results show that, compared with other similar methods, running for the same time, our method can achieve higher coverage and faster convergence speed. © 2011 Springer-Verlag.

关键词： software testing

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A simulative platform that evaluates the energy save rate of the street lamp system based on JiST/STRAW

A simulative platform that evaluates the energy save rate of...

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1st International Conference on Instrumentation and Measurement, computer, Communication and Control, IMCCC2011

作者： Yang, Tao Wang, Yinyang Xiong, Hu Yu, Liangwen Deng, Yong Hu, Jianbin Chen, Zhong School of Electronics Engineering and Computer Science Peking University Beijing 100871 China MoE Key Lab. of High Confidence Software Technologies Peking University Beijing 100871 China MoE Key Lab. of Network and Software Assurance Peking University Beijing 100871 China

ISBN: (纸本)9780769545196

With the society's advocacy of "low-carbon energy-saving" way of life, saving energy has been a heated topic. Although the street lamp is an indispensable part of the basic facilities of a city, its large energy consumption at present has wasted a lot of natural resources. In order to solve this problem, many scientific researchers provide many solutions by using software or hardware methods to save energy. On account of the process of scientific research nowadays, we design a simulation platform that evaluates the energy consumption on the basis of JiST and STRAW. By using this platform we can analogy and contrast every proposal to choose the best solution. What's more, we design a system that controls the street lamp based on Agent. We modify the configuration and simulate every possible option to choose the best. © 2011 IEEE.

关键词： Energy utilization

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VLSP: Enabling location privacy in vehicular location based services

VLSP: Enabling location privacy in vehicular location based ...

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1st International Conference on Instrumentation and Measurement, computer, Communication and Control, IMCCC2011

作者： Yang, Tao Tang, Cong Yu, Liangwen Xin, Wei Deng, Yong Hu, Jianbin Chen, Zhong School of Electronics Engineering and Computer Science Peking University Beijing 100871 China MoE Key Lab. of High Confidence Software Technologies Peking University Beijing 100871 China MoE Key Lab. of Network and Software Assurance Peking University Beijing 100871 China

ISBN: (纸本)9780769545196

In this paper, we present VLSP, a Vehicular Location based Service with Privacy grantees. In VLSP, we assume the service provider is untrusted and users do not have pre-established social relationships with each other, we use standard cryptographic primitives, Broadcast Encryption (BE) and Attribute-based Encryption (ABE) to provide privacy guarantees. By using VLSP, we are able to protect users' location privacy in vehicular location sharing social services. VLSP is mainly composed with three parts: OBUs, RSUs, and vehicular location sharing service provider. RSUs use RFID readers to communicate with users' OBUs to log users' locations, and uses standard cryptographic primitives and BE-based mechanism to establish trust and protect privacy for users who share their location information. We leverage ABE-based mechanism on service provider to control who can see users' location information. We evaluate VLSP using protocol, security and system implementation analysis, and find VLSP is both privacy-preserving and feasible. © 2011 IEEE.

关键词： Location based services

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