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Finding and evaluating the community structure in semantic peer-to-peer overlay networks

Science China(Information Sciences) 2011年第7期54卷 1340-1351页

作者： CHEN HanHua & JIN Hai services computing technology and system laboratory,Cluster and Grid computing laboratory,School of Computer Science and technology,Huazhong University of Science and technology,Wuhan 430074,China 1. Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

Recently much attention has been paid to semantic overlay networks for information retrieval in large scale peer-to-peer networks,and much research work on semantic overlay protocols and searching algorithms has been done and the results indicate that semantic overlay is efficient for content searching in peer-to-peer ***,very limited work has been done to analyze and evaluate the characteristics of semantic overlay *** this paper we identify a natural property of semantic overlay networks,the community *** propose a mathematical model to evaluate the property of community structure of semantic P2P overlay networks.A heuristic algorithm is designed to optimize the community *** the evaluation model we compare the SemreX semantic overlay with the Gnutella *** demonstrate that a SemreX overlay network has the distinctive community structure feature,while a Gnutella-like network does *** also simulate a simple flooding protocol in both overlays to show that the overlay with community structure is more efficient for content searching.

关键词： peer-to-peer community structure semantic overlay

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An efficient metadata management method in large distributed storage systems 1

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4th International Conference on Human-Centric computing, HumanCom'11 and the 6th International Conference on Embedded and Multimedia computing, EMC'11

作者： Ran, Longbo Jin, Hai Cluster and Grid Computing Lab. Services Computing Technology and System Laboratory Huazhong University of Science and Technology 430074 Wuhan China

ISBN: (数字)9789400721050

ISBN: (纸本)9789400721043

Efficient metadata management is a critical aspect of overall system performance in large distributed storage systems. Directory subtree partitioning and traditional hashing are two common techniques used for managing metadata in such systems, but both have some shortcomings, for example, in directory subtree partitioning method, the root node easily becomes a bottleneck, and for traditional hashing, a large directory hierarchy must be maintained and traversed. In this paper, we present a new method called directory-level-based metadata management that has high efficiency while avoiding the shortcomings of traditional methods. © 2011 Springer Science+Business Media B.V.

关键词： Metadata

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Reference metadata extraction from scientific papers

Reference metadata extraction from scientific papers

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

作者： Zhixin Guo Hai Jin Cluster and Grid Computing Laboratory Services Computing Technology and System Laboratory Huazhong University of Science and Technology Wuhan China

Bibliographical information of scientific papers is of great value since the Science Citation Index is introduced to measure research impact. Most scientific documents available on the web are unstructured or semi-structured, and the automatic reference metadata extraction process becomes an important task. This paper describes a framework for automatic reference metadata extraction from scientific papers. Our system can extract title, author, journal, volume, year, and page from scientific papers in PDF. We utilize a document metadata knowledge base to guide the reference metadata extraction process. The experiment results show that our system achieves a high accuracy.

关键词： Data mining Portable document format Knowledge based systems Accuracy Libraries Semantics Hidden Markov models

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RAPn: Network Attack Prediction Using Ranking Access Petri Net

RAPn: Network Attack Prediction Using Ranking Access Petri N...

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ChinaGrid Annual Conference (ChinaGrid)

作者： Moussa Djiriba Traore Hai Jin Deqing Zou Weizhong Qiang Guofu Xiang Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

Exploits sequencing is a typical way by which an attacker breaks into a network. In such a scenario, each exploit lays as an atomic proposition for subsequent exploits. An attack path is seen as a succession of exploits which take an attacker right to his/her final goal. The set of all possible attack paths form an attack graph. Researchers have proposed a multitude of techniques to generate attack graph which grows exponentially in the size of the network. Hence it is preferable to optimize the choice of solutions which avoid the cost of scalability and cumbersome. In this paper, we propose a comprehensive approach to network vulnerability analysis by ranking access Petri net graph and utilizing a penetration tester's perspective of maximal level of access possible on a host. Our approach has the following benefits: it provides a simple model in which an analyst can work, its algorithmic complexity is polynomial in the size of the network, and has the ability of scaling well to large size networks. Nevertheless, it has some drawback as in place of all possible attack paths, we seek only good attack paths. An analyst may make suboptimal choices when repairing the network.

关键词： Mathematical model Analytical models Databases Finite element methods Automata Permission

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Automatic power-aware reconfiguration of processor resource in virtualized clusters

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Jisuanji Yanjiu yu Fazhan/Computer Research and Development 2011年第7期48卷 1123-1133页

作者： Jin, Hai Deng, Li Wu, Song Shi, Xuanhua Zhou, Like Key Laboratory of Services Computing Technology and System Huazhong University of Science and Technology Ministry of Education Wuhan 430074 China Key Laboratory of Cluster and Grid Computing of Hubei Province Huazhong University of Science and Technology Wuhan 430074 China

Virtualization provides significant benefits of system maintenance, load balancing, fault tolerance, and power-saving in clusters or data centers. It also enables dynamic reconfiguration of computing resource for application environment. However, current dynamic resource control approaches mainly focus on how to satisfy the application-level quality of service (QoS) when application workloads vary with time. They are driven by application performance, which is often specific to certain class of applications and also weakens the response capability of control systems. In this paper, a resource-use-status-driven resource reconfiguration scheme (RUSiC) is presented to automatically adapt to dynamic workload changes to meet the demands of application performance. According to the new characteristics introduced by system virtualization, the scheme is designed to be a two-layer resource reconfiguration model to exactly grasp the demands of applications. Based on real resource use status, the scheme adjusts proper resource configuration for applications in time. Furthermore, the scheme introduces power-saving into resource reconfiguration process and avoids considerable unnecessary power and cooling consumption by reducing the number of active physical nodes in a new resource configuration. Experiments demonstrate that the scheme can quickly detect and respond to shifting resource demands as application workloads change over time.

关键词： Virtualization

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Virtual machine VCPU scheduling in the multi-core environment: Issues and challenges

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Jisuanji Yanjiu yu Fazhan/Computer Research and Development 2011年第7期48卷 1216-1224页

作者： Jin, Hai Zhong, Alin Wu, Song Shi, Xuanhua Key Laboratory of Services Computing Technology and System Huazhong University of Science and Technology Ministry of Education Wuhan 430074 China Key Laboratory of Cluster and Grid Computing of Hubei Province Huazhong University of Science and Technology Wuhan 430074 China

The policies and mechanisms of VCPU (virtual CPU) scheduling in a virtual machine system are key factors to determine the system performance. Because the architecture of the software stack in the virtual machine system is different from the traditional computer systems, when scheduling the VCPUs in virtual machines, simply adopting scheduling strategies and algorithms of existing operating systems without any modifications can lead to drastic degradation of the system performance. Moreover, with the multi-core technology being employed for physical processors, the complexity of the VCPU scheduling is increased. Firstly, the architecture of the virtual machine system and its two-stage scheduling framework are depicted and analyzed in detail in this paper. Because the deterministic mapping relationship between application threads and physical cores is difficult to establish in the two-stage framework, and part functions of operating systems move down to virtual machine monitor, VCPU scheduling will confront many problems and challenges that mainly embody four aspects: the semantic gap between guest operating systems and a virtual machine monitor, the synchronization mechanisms in a multiprocessor operating system, the structure of shared cache in multi-core processors and emerging asymmetric multi-core structure. And then advantages and limitations of the existing solutions for these problems are discussed and analyzed deeply, and suggestions for further researches are presented.

关键词： Virtual machine

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Content-Based Design Patent Image Retrieval Using Structured Features and Multiple Feature Fusion

Content-Based Design Patent Image Retrieval Using Structured...

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International Conference on Image and Graphics (ICIG)

作者： Lei Zhu Hai Jin Ran Zheng Qin Zhang Xia Xie Mingrui Guo 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

Traditional design patent verification based on manual comparison is too labor-intensive, time-consuming and subjective to be applied efficiently in practice. Design patent image retrieval system is designed to retrieve some similar patent images with much visual similarities. Structured features and multiple feature fusion are two main technologies to ensure the retrieval accuracy in the system. Block-wise Dense SIFT (Block-DSIFT), Pyramid Histograms of Orientation Gradients (PHOG), and GIST are proposed as main structured features. A multiple feature fusion algorithm for content-based design patent image retrieval is proposed to formulate the fusion as the linear combination of different matrixes which represent different feature distances between images to improve the precision of retrieval. The weights that reflect the significance of the features are determined by quadratic programming and can be solved efficiently. Experiments on a database of real design patent images show good efficiency and robustness of the proposed method and the system can be applied to design patent copyright validation.

关键词： Patents Feature extraction Histograms Image retrieval Shape Measurement Image color analysis

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Measuring and Analyzing CPU Overhead of Virtualization system

Measuring and Analyzing CPU Overhead of Virtualization Syste...

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IEEE Asia-Pacific Conference on services computing (APSCC)

作者： Guan Tong Hai Jin Xia Xie Wenzhi Cao Pingpeng Yuan 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

Virtualization as a powerful and convenient technique has been widely used recently. Inserting the VMM between the hardware and operation system enables multiple virtual machines simultaneously running on hardware. However, these changes in system architecture, while improving the whole physical computing resources' utilization, also pay a certain price for virtualization. How to measure this part of CPU overhead, and how about the relationship between this part of CPU overhead and virtual machine number and the type of workload executing in virtual machine are two important questions to the further research of virtualization performance. In this paper we provide a system to measure the overhead of virtualization. With this system we could dynamically obtain the utilization of computing resource. Based on the analysis to the results of several experiments, we compare and study the relationship between the different factors and the overhead of virtualization. Finally, we predict the probably trend of the overhead under the impact of some factors.

关键词： Virtual machining Virtual machine monitors Servers Hardware Schedules Kernel

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A voice gateway system based on P2P SIP VoIP

A voice gateway system based on P2P SIP VoIP

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International Conference on Pervasive computing and Applications (ICPCA)

作者： Xiaofei Liao Hai Jin Chang Shu 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

ISBN: (纸本)9781457702099

Introducing the P2P (Peer-to-Peer) technology into SIP (Session Initiation Protocol) networks can improve VoIP (Voice on Internet Protocol) system's reliability and scalability, and reduce the operating costs. In order to provide better and more comprehensive services in VoIP system, it is necessary to communicate with the traditional telecommunications networks, including PSTN (Public Switched Telephone Network), by a voice gateway. The voice gateway system for P2P-based SIP VoIP builds the connection, and transforms signaling and media, between IP service network and PSTN. SIP-in-P2P is implemented in voice gateway system, using DHT (Distributed Hash Table) scheme to connect VGW (Voice Gateway) nodes in the P2P SIP network. Based on the GWMN (Gateway Management Node) protocol, the system can manage VGW nodes in the management domain, and designed the discovery strategies and load balancing strategies to improve the performance. Results indicate that the voice gateway system performs with good reliability, scalability, interoperability and feasibility.

关键词： Logic gates Peer to peer computing Lead Motion pictures Cryptography Telecommunication network reliability

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LCM: A lightweight communication mechanism in HPC cloud

LCM: A lightweight communication mechanism in HPC cloud

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International Conference on Pervasive computing and Applications (ICPCA)

作者： Haibao Chen Song Wu Xuanhua Shi Hai Jin Yu Fu 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

ISBN: (纸本)9781457702099

Inspired by the concept of cloud computing, the construction of HPC Cloud with traditional HPC resources not only provides new opportunities to address the challenges to the traditional HPC, but also brings many exciting research problems. One of them is how to reduce the network overhead of virtual cluster in HPC cloud. In order to resolve the problem, this paper presents the design and implementation of lightweight communication mechanism for virtual cluster in HPC Cloud, called LCM, which maintains binary compatibility for applications written in standard socket interface. We implemented our design on Xen 3.2 with Linux kernel 2.6.18, and evaluated the speed of file transfer, the running time of NAS Parallel benchmark and binary compatibility using binary image of real socket applications. In our tests, we have proved that LCM realizes the high performance that is comparable to UNIX domain socket and ensures full binary compatibility.

关键词： IP networks Program processors Educational institutions

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