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Japan-China Joint Workshop on Frontier of Computer Science and technology (FCST)

作者： Haikun Liu Hai Jin Xiaofei Liao Zhengqiu Pan Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Virtual machine (VM) based logging-and-replay technology has attracted much attention for system security, fault tolerance, and debugging. However, so far there is not a replay system designed on virtual machine monitor Xen. In this paper, XenLR presents the design and implementation of a logging tool for full system replay on Xen. To reduce the design complexity, XenLR is achieved on a lightweight VM mini OS. Our preliminary work dedicates to identify architectural non-deterministic events and record them compactly. XenLR does not modify the guest OS and only need to record the external inputs (keyboard input and time update on mini OS). The log data are saved in the privileged domain¿s file system through transmission channels. The experiments indicate that XenLR results in low time and space overhead. Overhead due to logging is imperceptible for interactive use. The log files grow at 1.4 MByte/day, so it causes litter space consumption for today¿s large capacity disk storage.

关键词： Space technology Virtual machining Operating systems Computer science Virtual manufacturing Debugging Virtual machine monitors Counting circuits Kernel grid computing

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A Method of Estimating Traffic Status in Urban Road Network Based on grid technology

A Method of Estimating Traffic Status in Urban Road Network ...

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International Symposium on Intelligent Information technology Application, IITA

作者： Xinhong Wu Hai Jin Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

This paper describes a method using grid technology to improve traffic algorithm efficiency. The method cooperates traffic status estimation algorithm with grid technology. It collects and preprocesses massive real-time data of taxi global positioning system (GPS) as floating car data as well as geographic Information systems (GIS) data of Shanghai urban road network. Then, it adopts grid technology to deal with computation for the shortest time path algorithm on traffic status estimation in real time. The results of experiment prove that the grid technology can greatly improve the computing efficiency of traffic status estimation model.

关键词： Telecommunication traffic Traffic control grid computing Roads Global Positioning system Distributed computing clustering algorithms Computer networks Application software Geographic Information systems

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TCPBridge: A software approach to establish direct communications for NAT hosts

TCPBridge: A software approach to establish direct communica...

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ACS/IEEE International Conference on Computer systems and Applications

作者： Sanmin Liu Hai Jin Xiaofei Liao Hong Yao Deze Zeng Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

Traversing network address translation (NAT) for peer-to-peer (P2P) communication has become a hot topic recently. Compared to UDP, establishing TCP connections for hosts behind different NATs is more complex. Thus, many TCP-based applications do not address TCP traversal through NATs. Some solutions suggest using delegates to relay all communications, or tunneling TCP over UDP. However, they require a big reform to network architecture, or using a nonstandard TCP/IP stack. In this paper, we present a novel idea called TCPBridge. TCPBridge converts TCP traversal to UDP traversal without modifying any binaries of the TCP-based applications. Our design can be integrated with those P2P applications which have not solved TCP traversal problem, and extends them to support direct communications between NAT hosts. It deals with the problem of TCP traversal, so as to improve the usability of applications. We have implemented TCPBridge in several existing P2P systems. Statistics prove that TCPBridge is scalable and robust, and we believe it will benefit many other existing P2P applications.

关键词： Network address translation TCPIP Application software Punching Robustness Protocols Communication system software grid computing Computer science Peer to peer computing

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WAGA: A Flexible Web-Based Framework for grid Applications

WAGA: A Flexible Web-Based Framework for Grid Applications

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IEEE Asia-Pacific Conference on services computing (APSCC)

作者： Xuanhua Shi Zhao Chen Hai Jin Song Wu Ke Fan Service Computing Technology and System Lab/Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

The research about the interaction between grid environments and users is becoming popular. Many scientists propose the integration for Web 2.0 technologies and grid computing. In this paper, we propose a flexible Web-based framework for grid applications - WAGA, which tries to bridge the gap between grid middleware and grid applications. WAGA provides a WYSIWYG (what you see is what you get) way for the programming for grid applications by adopting participation, interaction and sharing features of Web 2.0 technology. With WAGA, a grid user is able to use the grid resources and to develop grid applications without understanding the underlying complexity of grids. WAGA is composed with a Web GUI (called WAGA-designer) and someWeb-based APIs. WAGA-designer is used by grid users to develop application-based Web portal, and the WebAPIs are used by the WAGA-designer. The use case study shows that WAGA is flexible for grid users, and the performance evaluation shows that WAGA works with high efficiency.

关键词： Middleware grid computing Graphical user interfaces Application software Portals Bridges Resource management Computer science Programming profession Mashups

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Proxy Based Parallel Data Transfer Mechanism in grid Environment

Proxy Based Parallel Data Transfer Mechanism in Grid Environ...

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International Workshop on Intelligent Networks and Intelligent systems (ICINIS)

作者： Muzhou Xiong Hai Jin Song Wu Service Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

This paper proposes a novel parallel data transfer mechanism to improve the performance of data transfer in grid environment. It utilizes the servers distributed in grid system and selects some of them as the proxy servers. It introduces the method of how to select the proxy server. Then data are divided into several parts and sent through the selected proxy servers with different physical links. By that, it can effectively improve the performance of data transfer.

关键词： Web server Bandwidth Joining processes Internet Intelligent networks grid computing Distributed computing Physics Intelligent systems Computers

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MSVM-kNN: Combining SVM and k-NN for Multi-class Text Classification

MSVM-kNN: Combining SVM and k-NN for Multi-class Text Classi...

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IEEE International Workshop on Semantic computing and systems, WSCS

作者： Pingpeng Yuan Yuqin Chen Hai Jin Li Huang Service Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9780769533162

Text categorization is the process of assigning documents to a set of previously fixed categories. It is widely used in many data-oriented management applications. Many popular algorithms for text categorization have been proposed, such as Naive Bayes, k-Nearest Neighbor (k-NN), Support Vector Machine (SVM). However, those classification approaches do not perform well in every case, for example, SVM can not identify categories of documents correctly when the texts are in cross zones of multi-categories, k-NN cannot effectively solve the problem of overlapped categories borders. In this paper, we propose an approach named as Multi-class SVM-kNN (MSVM-kNN) which is the combination of SVM and k-NN. In the approach, SVM is first used to identify category borders, then k-NN classifies documents among borders. MSVM-kNN can overcome the shortcomings of SVM and k-NN and improve the performance of multi-class text classification. The experimental results show MSVM-kNN performs better than SVM or kNN.

关键词： Support Vector Network Text categorization multi-class borders Category

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Intel, Merced, and the Fate of Microprocessor Forum

Intel, Merced, and the Fate of Microprocessor Forum

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IEEE Hot Chips Symposium (HCS)

作者： Michael Slater ETS-Lindgren Cedar Park TX USA Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

This article consists of a collection of slides from the author's conference presentation. It is concluded that unrealistic targets are endemic to a highly visible project managed by executives disconnected from t... 详细信息

关键词： Microprocessors Hardware

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Aeolus: Reconcilable Key Management Mechanism for Secure Group Communication in grid

Aeolus: Reconcilable Key Management Mechanism for Secure Gro...

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IEEE Asia-Pacific Conference on services computing (APSCC)

作者： Yunfa Li Xiangha Xu Jian Wan Hai Jin Zongfen Han Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Hangzhou Dianzi University Hangzhou Zhejiang CN

In traditional grid, grid user can not validate whether grid service registered in grid platform can execute correctly or not because the system does not provide the measurement mechanism for grid service. In order to solve this problem, we propose a series of strategies and methods for trusted grid. These strategies and methods include: an access control policy for reference database, an integrity attestation for reference datasheet, a construction method of reference datasheet, a trusted storage algorithm of reference datasheet and a report algorithm of reference datasheet. All these constitute the measurement mechanism of service for trusted grid. Some experiments are done in order to validate the feasibility and the availability of this mechanism. The results show that it is feasible and efficient to validate whether grid service registered in trusted grid platform can execute correctly or not.

关键词： Distribution strategy grid computing Information security Centralized control technology management Computer science Character generation Large-scale systems Distributed computing Conference management

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A Prioritized Chinese Wall Model for Managing the Covert Information Flows in Virtual Machine systems

A Prioritized Chinese Wall Model for Managing the Covert Inf...

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The 9th International Conference for Young Computer Scientists(第九届国际青年计算机大会)

作者： Ge Cheng Hai Jin Deqing Zou Alex K. Ohoussou Feng Zhao Service Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

In virtual machine (VM) systems, mandatory access control (MAC) enforcement is possible now. This technique is both stronger and more flexible than traditional VM isolation, even if network communication is controlled. Unfortunately all of the VM systems with the MAC enforcement does not consider that the MAC controls may be distorted by covert channels, which constitute an important risk in VM systems. Traditional MAC models have difficulties being enforced to reduce the risk of covert flows in VM systems due to the many constraints and the lack of flexibility. In this paper, we identify access control requirements for managing covert channels in VM systems through a critical analysis of the ways by which classical models constrain the covert information flows and we propose a model called the Prioritized Chinese Wall model (PCW) to reduce the risk of covert flows in VM systems while preserving the flexibility. Furthermore, we enforce the policy in sHype/Xen VM system.

关键词： Information management Virtual machining Virtual manufacturing Communication system control Control systems Risk management Access control Hardware grid computing Isolation technology

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A multicast based bandwidth saving approach for wireless live streaming system

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International Journal of Smart Home 2008年第1期2卷 65-80页

作者： Jiang, Wenbin Jin, Hai Liao, Xiaofei Yuan, Zhi Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan 430074 China Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan 430074 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

P2P based live streaming applications are growing up rapidly. However, when extending them to WLANs, the bandwidth bottleneck and the high rate of packet loss are usually the major stumbling blocks. To overcome this issue, a new wireless multicast agent mechanism (WiMA) based on the IP multicast scheme for buffer management and scheduling is proposed. First of all, a wireless agent selection method is presented to choose an appropriate agent for WiMA. Then this agent gains media data by interacting with wired neighbor peers as a common P2P node, and transmits these data to other wireless peers in the WLAN by means of multicast pushing and multicast patching. A normal wireless peer requests data according to the strategy of "emergent ones first". Experimental results show that the approach proposed can significantly save bandwidth in WLANs with acceptable start delay and satisfied playing continuity.

关键词： Wireless local area networks (WLAN)

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