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A Replication and Cache based Distributed Metadata Management System for Data grid

A Replication and Cache based Distributed Metadata Managemen...

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ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed computing (SNPD)

作者： Ke Shi Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology China

Metadata management is a key technique of data grid. This paper presents a replication and cache based metadata management system (RCMMS) to improve metadata management of Global Distributed Storage System (GDSS). Storage Service Provider (SSP) of GDSS has dedicated buffer to cache metadata. The design, implementation and evaluation of RCMMS are discussed in this paper. RCMMS provides efficient algorithms to manage highly dynamic metadata replicas. The evaluation demonstrates that replica plus cache metadata management system outperforms existing metadata management system of GDSS.

关键词： Least squares approximation technology management Buffer storage Cache storage Peer to peer computing Resource management Data communication Master-slave Software engineering Artificial intelligence

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Multiple-Access Channel Model for P2P Networks

Multiple-Access Channel Model for P2P Networks

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IEEE Asia-Pacific Conference on Services computing (APSCC)

作者： Aobing Sun Hai Jin Ran Zheng Qin Zhang 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

Peer-to-peer (P2P) technology encounters serious methodological limitations to guarantee the quality of services (QoS) of P2P networks with very few peers. In this paper, we propose multiple-access channel model (MACM) to merge different P2P networks as a whole to share their data-transfer capability. The model abstracts the interlaced data links between peers as logical data channels according to their spatial-temporal relations. The channels can be subdivided based on multiplex technology and serve different applications at same time. MACM redefines P2P data-packet structure and organizes data packets into time-related groups according to cascade-packet rule to support controllable data-projection between data pools of peers. MACM-based P2P networks can be created as virtual sub-network or virtual-peer bridging strategy so as to improve the performance of P2P networks with few peers but high priorities within Internet protocol television (IPTV) and wireless sensor network (WSN) applications.

关键词： IPTV Wireless sensor networks grid computing Peer to peer computing TV computer networks Sun Radio access networks computer science Quality of service

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WiMA: A Novel Wireless Multicast Agent Mechanism for Live Streaming System

WiMA: A Novel Wireless Multicast Agent Mechanism for Live St...

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International Conference on Convergence Information technology

作者： Wenbin Jiang Xiaofei Liao Hai Jin Zhi Yuan 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

ISBN: (纸本)9781424431779

The bandwidth bottleneck and the high rate of losing packets are the major obstacles when extending P2P live streaming system to WLAN. To tide over them, a new wireless multicast agent mechanism (WiMA) based on the IP multicast buffering schedule is proposed. Wireless multicast agent gains media data by interacting with wired neighbor peers as a common P2P node, and sends data to other wireless peers in WLAN by means of multicast pushing and multicast patching. A normal wireless peer requests data according to the strategy of "emergent ones first". Experiments show that WiMA can save bandwidth in WLAN obviously with acceptable start delay and satisfied playing continuity.

关键词： Wireless LAN Peer to peer computing Bandwidth WiMAX Tides Delay Internet Smart phones Wireless networks Information technology

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A Hidden Credential Based Oblivious Automated Trust Negotiation Model

A Hidden Credential Based Oblivious Automated Trust Negotiat...

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IEEE International Conference on e-Business Engineering (ICEBE)

作者： Zhensong Liao Hai Jin Deqing Zou 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

Automated trust negotiation (ATN) is an important means to establish trust between strangers through the exchange of digital credentials and access control policies specifying what credentials a stranger must submit in the open and distributed environment. While ATN brings convenience, there are still two issues unsolved successfully: 1) to protect the transmitting message; 2) to prevent the sensitive information leakage. Hidden credential can provide high security level to protect sensitive resources, policies and credentials from being attacked. Zero-knowledge is an important means to avoid leakage and can be used to protect the user's private context and sensitive information from unauthorized inferences. If hidden credentials and zero-knowledge are well-combined and redesigned, they can jointly make ATN better. Based on these, a hidden credential based oblivious automated trust negotiation model (HBOA) is proposed in this paper. In the model, the negotiation information is carried by hidden credentials, which have the same secure level with elliptic curve. Zero-knowledge protocol is provided by Pedersen commitment scheme, which ensures that no sensitive information can be attained by authorized users. A practical example is given to prove its usability.

关键词： Information security Protection Protocols Identity-based encryption Access control Elliptic curves Elliptic curve cryptography Middleware computers grid computing

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A Scalable Service Scheme for Secure Group Communication in grid

A Scalable Service Scheme for Secure Group Communication in ...

引用

IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： Yunfa Li Hai Jin Deqing Zou Jieyun Chen 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

In this paper, we propose a scalable service scheme for secure group communication in grid. In the service scheme, a series of methods and strategies are presented, such as the initialization methods for group member, administrative domain and virtual organization, the key distribution strategy and the rekeying strategy. In order to improve the scalability of this service scheme, the services for a group are logically divided into two hierarchical levels, which is in accordance with the characteristics of group communication in grid. In addition, in order to show the efficiency and the scalability of the service scheme, simulation experiments are done. The results show that the service scheme is efficient and scalable. Thus, the service scheme can satisfy the requirement of people in large-scale, dynamic grid environment.

关键词： grid computing Scalability Large-scale systems Information security Public key computer science Distribution strategy Analytical models Broadcasting Protocols

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grid Security Interoperation between CGSP and VEGA

Grid Security Interoperation between CGSP and VEGA

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International Conference on Future Generation Communication and Networking (FGCN)

作者： Deqing Zou Hai Jin Xueguang Chen Zongfen Han Cluster and Grid Computing Laboratory Services Computing Technology and System Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9780769530482;0769530486

grid computing emerges as an effective technology to couple geographically distributed resources and solve large-scale computational problems in wide area networks. There are several popular grid platforms, such as UNICORE and Globus Toolkit. Many famous grid projects are constructed with these platforms, each of which manages different distributed resources. In order to aggregate resources managed by different grid platforms, it is necessary to implement the interoperation among these grid platforms. Security interoperation is one of key issues for the interoperation. CGSP (Chinagrid Support Platform) and VEGA are two popular grid platforms in China. To achieve security interoperation between these two platforms, four mapping policies, including user-user mapping, user-agora mapping, role-user mapping, role-agora mapping, are proposed in this paper. The security interoperation process is proposed based on SAML specification and the mapping policies. We also analyze the flexibility of mapping policies and the security of the interoperation process.

关键词： Security Resource management grid computing Authentication Large-scale systems computer networks Distributed computing Wide area networks Web services Middleware

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Providing VoD Services Based on Unstructured Overlay

Providing VoD Services Based on Unstructured Overlay

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2007年第三届语义和知识网格国际会议(Third International Conference on Semantics,Knowledge,and grid)(SKG 2007)

作者： Bin Cheng Hai Jin Xiaofei Liao 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 430074 China

It is still a challenging task to provide large scale video-on-demand (VoD) streaming services based on overlay network due to its inherent dynamicity and heterogeneity. Most of previous work has focused on how to construct a structured overlay to tackle this issue, i.e., tree-based overlay and DHT. However, they always suffer from inefficient resource utilization and poor reliability. In this paper, we propose a new solution based on unstructured overlay, called gridCast, in which a directional gossip protocol and a score-based partner selection algorithm are designed to explore multiple data suppliers for each joined peer. In this way, gridCast can make efficient use of the available upload bandwidth of peers to achieve better scalability and reliability. The experimental results from our early deployment show that it is feasible to provide scalable VoD services based on unstructured overlay.

关键词： Peer to peer computing Streaming media Bandwidth Protocols Algorithm design and analysis Scalability Web and internet services Costs Video sharing computers

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PBJIM: Plugin-based Job Interoperation Mechanism for Heterogeneous grid Systems

PBJIM: Plugin-based Job Interoperation Mechanism for Heterog...

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第六届网格与协同计算国际会议(The Sixth International Conference on grid and Cooperative computing GCC 2007)

作者： Song Wu Yongcai Tao Zhongqing Xu 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

With the development of grid technology, grid gains more popularity that ever and a variety of grid middlewares come into being. However, most of grid middlewares are developed by their own, and it's not easy to interoperate these grid platforms. Existing grid interoperability projects mainly resorts to case-by-case mechanism, which is simple but of poor scalability. Job management is the core and the most complex components of grid system. To realize the interoperability of heterogeneous grids, the interoperation of heterogeneous job managements must be addressed In the paper, a plugin based job interoperation mechanism for heterogeneous grid systems, called PBJIM, is proposed, which is based on the idea of virtualization and plug-in *** are two well-established grid systems in China,Chinagrid and China National grid, and they are built with two different grid middlewares, CGSP and VEGA. Via PBJIM, the interoperation of job management of these two grid systems is achieved.

关键词： Middleware grid computing Information management Identity management systems computer science Scalability Standards development Data security Information security Management information systems

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Negotiated Coscheduling in a P2P Based HPC Platform

Negotiated Coscheduling in a P2P Based HPC Platform

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第六届网格与协同计算国际会议(The Sixth International Conference on grid and Cooperative computing GCC 2007)

作者： Fei Luo Hai Jin Xiaofei Liao Qin Zhang Services 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

To promote peer-to-peer (P2P) based high performance computing (HPC), new scheduling strategies are necessarily designed to break the limitation in current systems, which only support applications with independent tasks. Therefore, we introduce a negotiated coscheduling policy, which supports applications with interactive tasks in a structured P2P based HPC platform, P2HP-2. In this policy, with the help of a project description file, a negotiated dispatching metric with two priorityentitling algorithms is proposed, which distributes tasks across computing resources. The coscheduling is further processed with two steps: spinning for dependent data and performing tasks' ***, a reliable message-event transmission method and a load balancer are developed to improve the performance. All our preliminary results show that this scheduling policy is efficient and fault-tolerant to support applications with task-dependent relationships.

关键词： Processor scheduling Distributed computing Concurrent computing Pervasive computing grid computing Internet computer science Peer to peer computing High performance computing Application software

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OCTOPUS: A Hybrid Scheduling Strategy for P2P VoD Services

OCTOPUS: A Hybrid Scheduling Strategy for P2P VoD Services

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第六届网格与协同计算国际会议(The Sixth International Conference on grid and Cooperative computing GCC 2007)

作者： Xiaofei Liao Hai Jin Services 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

Peer-to-Peer (P2P) networks have been shown to be a promising approach to provide large-scale Video on Demand (VoD) services over Internet for its potential high scalability. However, for a normal peer,how to efficiently schedule media data to multiple asynchronous peers for VoD services in such networks remains a major challenge. Hereby we propose a hybrid scheduling scheme for data dissemination in P2P VoD system in this paper, called OCTOPUS,which is combined with adaptive scheduling scheme at normal time and special scheduling strategy emergently. Usually each peer is given a value,meaning scheduling bandwidth to represent service capacity, which is an integrated evaluation for peer's bandwidth and services ability, also including statistical characteristics about historical data transferring. According to the value, one peer can adjust the expectation of each neighbor's abilities and send scheduling request of media data to all *** case of failure scheduling, emergent scheduling scheme will be called and limited data requests will be sent to media servers. OCTOPUS scheme helps to make sufficient utilization of end-peers' resource,alleviate the load of source server and improve their scalability. Experimental result from a P2P VoD system, gridCast, based on OCTOPUS schemes,shows that OCTOPUS achieves obvious effect.

关键词： Peer to peer computing Streaming media Bandwidth Network servers Processor scheduling Scalability grid computing Internet Web server computers

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