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International Conference on Electrical and Control Engineering (ICECE)

作者： Han-Bing Yan Ya-Shu Liu National Computer Network Emergency Response Technical Team/Coordination Center of China National Institute of Network and Information Security Beijing China Department of Computer Science Beijing University of Civil Engineering and Architecture Beijing China

With the development of Internet, Email has become an important interaction manner. At the same time, spam becomes a boring thing in our life, and people pay more and more attention to spam filter. In this paper, we propose a method that uses N-Gram to calculate characters and uses X statistical method to extract characters, and then uses incremental Native Bayes arithmetic to hold up spam. In order to arise accuracy we use the filter method over and over again. The experiments show that our method is very effective, which greatly raises the accurarcy while keeping a minor error ratio.

关键词： Information filters Emergency services Information security Internet Statistical analysis Electronic mail

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The QoE provisioning-delivery-hysteresis and its importance for service provisioning in the Future Internet

The QoE provisioning-delivery-hysteresis and its importance ...

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Conference on Next Generation Internet Networks, NGI

作者： Tobias Hoßfeld Markus Fiedler Thomas Zinner Julius-Maximilians-Universitat Wurzburg Wurzburg Bayern DE Blekinge Institute of Technology School of Computing Sweden University of Würzburg Institute of Computer Science Chair of Communication Networks Germany

Quality of Experience (QoE) combines non-technical parameters such as user perception, experience and expectations with technical parameters such as application- and network-level Quality of Service (QoS). For service or network providers, it is important to understand the quantitative relationship between QoE and these technical parameters in order to manage the user-perceived quality. This paper investigates the different impacts of a) provisioning and b) delivery problems due to insufficient resources on QoE, leading to the QoE provisioning-delivery hysteresis (QoE-PDH). We demonstrate the QoE-PDH for Voice-over-IP, live video streaming, and web browsing based on existing measurement studies. The results clearly quantify the necessity to control quality, instead of suffering from uncontrollable impacts like packet loss caused by congestion. The implementation and the limitations of the QoE-PDH in the current Internet is shown using the example of Skype. Afterwards we discuss how these results can be used to enhance energy-efficient service provisioning and delivery in the Future Internet.

关键词： Streaming media Codecs Bandwidth Degradation Internet Hysteresis Loss measurement

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Optimizing Web Browser on Many-Core architectures

Optimizing Web Browser on Many-Core Architectures

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IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Lingjun Fan Weisong Shi Shibin Tang Chenggang Yan Dongrui Fan Graduate University of Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Department of Computer Science Wayne State University Detroit USA

As more and more Web applications emerging on sever end today, the Web browser on client end has become a host of a variety of applications other than just rendering static Web pages. This leads to more and more performance requirements of a Web browser, for which user experience is very important. This situation may become more urgency when on handheld devices. Some efforts like redesign a new Web browser have been made to overcome this problem. In this paper, we address this issue by optimizing the main processes of the Web browser on a state-of-the-art 64-core architecture, Godson-T, which was developed at Chinese Academy of sciences, as multi-/many-core architecture to be the mainstream processor in the upcoming years. We start a new core to process a new tab when facing up to intensive URL requests, and we use scratch-pad memory (SPM) of each core as a local buffer to store the HTML source data to be processed to reduce off-chip memory access and exploit more data locality, otherwise, we use DTA to transfer HTML data for backup. Experiments conducted on the cycle-accurate simulator show that, starting each tab process by a new core could obtain 5.7% to 50% speedup with different number of cores used to process corresponding URL requests, with on-chip scratchpad memory of each core used to store the HTML data, more speedup could be achieved when number of cores increase. Also, as Data Transfer Agent (DTA) used to transfer the HTML data, the backup of HTML data can get 2X to 5X speedups according to different data amount.

关键词： Browsers HTML Web pages Layout Multicore processing System-on-a-chip

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Design of WSN node for the mountain torrent disaster warning system

Design of WSN node for the mountain torrent disaster warning...

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2011 International Conference on Internet Technology and Applications, iTAP 2011

作者： Gu, Aihua Yan, Xijun Wai, Xia Wang, Huibin Li, Xiaofang Wei, Xiaodong School of Computer and Information Hefei University of Technology Hefei China College of Computer and Information Engineering Hohai University Nanjing China College of Electronic and Information Engineering Anhui University of Architecture Hefei China Department of Computer Science Anhui Zhong-Ao Institute of Technology Hefei China

ISBN: (纸本)9781424472550

In the mountain torrent disaster warning system, how to use high-performance embedded microcontroller controller and low consumption technology are the key problem. This paper designs a wireless sensor network (WSN) to adapt the request of mountain torrent disaster early-warning system. The sensor node collects the information such as soil water content, permeability coefficient, displacement and rainfall, etc. To realize real-time data storage and process, the gathering node receives the real-time data and sent it to information center through GPRS networks. The system replaces the cable transmission mode with the wireless transmission way, which can reduce the costs of installation and maintenance, and improve the system reliability and expansibility. This system must have a wide application prospects. © 2011 IEEE.

关键词： Disasters

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Dynamic register promotion of stack variables 11

Dynamic register promotion of stack variables

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International Symposium on Code Generation and Optimization (CGO)

作者： Jianjun Li Chenggang Wu Wei-Chung Hsu Graduate University of Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Deparunent of Computer Science National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9781612843568

Dynamic Binary Translation (DBT) has been widely used in various applications. Although new architectures and micro-architectures often create performance opportunities for programmers and compilers, such performance opportunities may not be exploited by legacy executables. For example, the additional general-purpose and XMM registers in the Intel64 architecture do not benefit the IA-32 binaries. In this paper, we designed and developed a DBT system to dynamically promote stack variables in the source binaries to the additional registers of the target architecture. One of the most challenging problems is how to deal with the possible but rare memory aliases between promoted stack variables and other implicit memory references. We devised a runtime alias detection approach based on the page protection mechanism in Linux and a novel stack switching method to catch memory aliases at run-time. This approach is much less expensive than traditional approaches like inserting address checking instructions. On an Intel64 platform, our DBT system with speculative stack variable promotion has sped up several SPEC CPU2006 benchmarks in IA-32 code, with the largest performance gain over 45%.

关键词： Registers Optimization Switches computer architecture Benchmark testing Runtime Program processors

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Intersatellite Links and Relative Navigation: Pre-conditions for Formation Flights with Pico- and Nanosatellites

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IFAC Proceedings Volumes 2011年第1期44卷 3027-3032页

作者： Michael Marszalek Oliver Kurz Maximilian Drentschew Marco Schmidt Klaus Schilling ZfT – Zentrum für Telematik e.V. Gerbrunn Germany Fraunhofer Institute for Integrated Circuits IIS Nürnberg Germany Chair of Computer Science VII – Robotics and Telematics University Würzburg Germany

Abstract A group of satellites can be classified as a constellation, formation or cluster. Multiple coordinated satellites are described as a formation, if a closed-loop control is adjusted, thus providing a coordinated motion control on basis of their relative positions to preserve the topology (Schilling [2009]). This technology enables various application scenarios, for example, interferometry or in-orbit servicing and it is subject to multiple technological requirements related to formation flying, limited resources or scientific payloads. In the framework of the feasibility study NaKoFo, this paper discusses the potential benefits, drawbacks and problems associated with intersatellite links and relative navigation with pico- and nanosatellites. The requirements of an intersatellite link are analyzed based on frequency, modulation, antenna, power and network protocol. A short overview of adequate communication systems for pico- and nanosatellites is also presented. Technologies for relative position determination are presented and discussed regarding their applicability in small satellite systems as well as their requirements on an intersatellite link.

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Dynamic Resource Allocation Based on User experience in Virtualized Servers

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Procedia Engineering 2011年 15卷 3780-3784页

作者： Wei Zhang Jiajun Liu Ying Song Mingfa Zhu Limin Xiao Yuzhong Sun Li Ruan State Key Laboratory of Software Development Environment Beijing 100191 China School of Computer Science and Engineering Beihang University Beijing 100191 China Key Laboratory of Computer System and Architecture Chinese Academy of SciencesBeijing Institute of Computing Technology Chinese Academy of Sciences Beijing China

Web workloads are known to vary dynamically with time which poses a challenge to resource allocation among the applications. In this paper, we argue that the existing dynamic resource allocation based on resource utilization has some drawbacks in virtualized servers. Dynamic resource allocation directly based on real-time user experience is more reasonable and also has practical significance. To address the problem, we propose a system architecture that combines real time measurements and analysis of user experience for resource allocation. We evaluate our proposal using Webbench. The experiment results show that these techniques can judiciously allocate system resources.

关键词： resource allocation virtualized servers user experience

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2011年 6552 LNCS卷

作者： Katoh, Naoki Kumar, Amit Kyoto University Department of Architecture and Architectural Engineering Nishikyo-ku Kyoto 615-8540 Japan Indian Institute of Technology Department of Computer Science and Engineering Hauz Khas New Delhi 110016 India

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PAC-Bayesian Analysis of Contextual Bandits 11

PAC-Bayesian Analysis of Contextual Bandits

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Annual conference on Neural Information Processing Systems

作者： Yevgeny Seldin Peter Auer Francois Laviolette John Shawe-Taylor Ronald Ortner Max Planck Institute for Intelligent Systems Tübingen Germany and Department of Computer Science University College London UK Chair for Information Technology Montanuniversität Leoben Austria Département d'informatique Université Laval Québec Canada Department of Computer Science University College London UK

ISBN: (纸本)9781618395993

We derive an instantaneous (per-round) data-dependent regret bound for stochastic multiarmed bandits with side information (also known as contextual bandits). The scaling of our regret bound with the number of states (contexts) N goes as NIpt(S;A)~1/2, where I_pt(S;A) is the mutual information between states and actions (the side information) used by the algorithm at round t. If the algorithm uses all the side information, the regret bound scales as N In K~1/2, where K is the number of actions (arms). However, if the side information I_pt(5;A) is not fully used, the regret bound is significantly tighter. In the extreme case, when I_pt (S;A) = 0, the dependence on the number of states reduces from linear to logarithmic. Our analysis allows to provide the algorithm large amount of side information, let the algorithm to decide which side information is relevant for the task, and penalize the algorithm only for the side information that it is using de facto. We also present an algorithm for multiarmed bandits with side information with O(K) computational complexity per game round.

关键词： side information Regret algorithms information Bound extreme case Bayes methods

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A novel method for gearbox fault detection based on biorthogonal B-spline wavelet

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Sensors and Transducers 2011年第10期133卷 83-94页

作者： Zhang, Guangbin Ge, Yunjian Department of Automation University of Science and Technology of China Hefei 230026 China Institute of Intelligent Machines Chinese Academy of Sciences Hefei 230031 China Department of Computer Engineering Anhui University of Architecture Hefei 230601 China

Localized defects of gearbox tend to result in periodic impulses in the vibration signal, which contain important information for system dynamics analysis. So parameter identification of impulse provides an effective approach for gearbox fault diagnosis. Biorthogonal B-spline wavelet has the properties of compact support, high vanishing moment and symmetry, which are suitable to signal de-noising, fast calculation, and reconstruction. Thus, a novel time frequency distribution method is present for gear fault diagnosis by biorthogonal B-spline wavelet. Simulation study concerning singularity signal shows that this wavelet is effective in identifying the fault feature with coefficients map and coefficients line. Furthermore, an integrated approach consisting of wavelet decomposition, Hilbert transform and power spectrum density is used in applications. The results indicate that this method can extract the gearbox fault characteristics and diagnose the fault patterns effectively. © 2011 IFSA.

关键词： Failure analysis

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