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Improving Search in Peer-to-Peer Literature Sharing systems via Semantic Small World

Improving Search in Peer-to-Peer Literature Sharing Systems ...

引用

Euromicro Conference on Parallel, Distributed and Network-Based Processing

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

Efficient search for unstructured peer-to-peer information retrieval systems is a challenging problem. This paper proposes a semantic overlay based on the small world phenomenon that facilitates efficient search for information retrieval in unstructured P2P systems. In the semantic overlay, each node maintains a number of short-range links which are semantically similar to the node, together with a small collection of long-range links that help increase recall rate of information retrieval as well as reduce network traffic. In this paper we present how to construct and maintain a semantic small world overly, and the search strategy utilizing the above semantic overlay. Experimental results show that our model can improve performance by 150% compared to Gnutella and by up to 50% compared to the Interest-based model, a similar shortcut-based search technique

关键词： Peer to peer computing Information retrieval Telecommunication traffic Traffic control Indexing Costs Scalability grid computing Computers Floods

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Using NARX Neural Network Based Load Prediction to Improve Scheduling Decision in grid Environments

Using NARX Neural Network Based Load Prediction to Improve S...

引用

International Conference on Natural Computation (ICNC)

作者： Jin Huang Hai Jin Xia Xie Qin Zhang Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

In grid environment, applications are in active competition with unknown background workloads introduced by other users. To achieve good performance, performance models are used to predict the possible status of the resources, and to make decisions of the selection of a performance-efficient application execution strategy. In this paper, we present a scheduling decision method that utilizes the NARX neural network based load prediction to define data mappings appropriate for dynamic resources. This method uses the information of the predicted CPU load interval and variance of future resource capabilities to obtain the CPU load decision, which can be used to guide the scheduling decision. As to the predictor used here, the NARX neural network based predictor learns the model of the system from the external input information and the system itself. It inherits the mapping capability of feed forward networks and, at the same time, captures the dynamic features of load information. In this work, our predictor shows good performance for time series prediction.

关键词： Neural networks Predictive models Processor scheduling grid computing Dynamic scheduling Availability Computers Feeds Parallel processing Concurrent computing

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An EMAIL Based Automated Trust Negotiation Model

An EMAIL Based Automated Trust Negotiation Model

引用

International Conference on Computational Intelligence and Security

作者： Zhensong Liao Hai Jin Deqing Zou Chisong Li Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory 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 mobile access control policies specifying what combinations of credentials a stranger must submit. While ATN provides a good mechanism to share resources in the open and distributed environments, there still exist some pitfalls. A notable problem is that the negotiation process is easy to be interrupted, which leads the negotiation to failure. Thereto, current protection techniques are somehow complex and heavyweight, which greatly limits ATN's applications. To solve these problems, an Email Based ATN Model (EBAM) is proposed. A credential template and an access control policy template are specified to carry information. All the transmitted messages are encrypted by private keys. The data exchange is realized through the negotiators' emails. A use case is given to show how it works, which proves the model sound and reasonable.

关键词： Cryptography Costs Security Access control Protocols Public key Computational intelligence Computers grid computing Mobile computing

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Ontology Based grid Information Interoperation

Ontology Based Grid Information Interoperation

引用

International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Sheng Di Hai Jin Shengli Li Ling Chen Li Qi Chengwei Wang Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wunan China

A series of problems arises with the emergence and fast development of grid. Among all the problems, one of them is how to smoothly connect heterogeneous grid platforms. There are a number of ways to solve this problem and the relatively more efficient one is using ontology. Based on this method, we focus on alleviating semantic inconsistency of various platforms and designing a novel ontology. This ontology is depicted by resource description framework (RDF) and transacted by adapters. Finally, we test our method and analyze its performance.

关键词： Ontologies grid computing Distributed computing Water Resource description framework Testing Spine Resource management Web services Computers

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A Flexible two-level mechanism in querying and presenting large-scale historical monitoring data

A Flexible two-level mechanism in querying and presenting la...

引用

Asia-Pacific Conference on Communications

作者： Sheng Di Hai Jin Shengli Li Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781424413737;1424413737

With the increasing scale of data transmitted over Internet, how to effectively query and present mass distributed monitoring data has become a serious problem in distributed monitoring field. Almost all users want to retrieve data as detail as possible; on the other hand, the practical bandwidth and latency limit the data scale in transmission. In order to solve this conflict, we design a flexible two-level mechanism. In our platform with this mechanism, users can customize various retrieving spaces by submitting their clients' memories. Subsequently, after receiving some request of observing the performance of monitored nodes, the server-end will process the data queried from database according to some rules before responding clients with two-level monitoring data streams (compressed data level and original data level). Through carefully testing, we testify this mechanism is indeed valuable in querying and presenting large-scale monitoring data.

关键词： Large-scale systems Monitoring Testing Bandwidth Databases grid computing Delay Data security Computers Web and internet services

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Providing VoD services Based on Unstructured Overlay

Providing VoD Services Based on Unstructured Overlay

引用

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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OCTOPUS: A Hybrid Scheduling Strategy for P2P VoD services

OCTOPUS: A Hybrid Scheduling Strategy for P2P VoD Services

引用

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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Negotiated Coscheduling in a P2P Based HPC Platform

Negotiated Coscheduling in a P2P Based HPC Platform

引用

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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VolunteerLive: Introducing Volunteer Nodes into P2P Live Streaming

VolunteerLive: Introducing Volunteer Nodes into P2P Live Str...

引用

International Conference on Intelligent Pervasive computing (IPC)

作者： Xuping Tu Hai Jin Xiaofei Liao Qi Huang Hong Yao 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)9780769530062;0739530060

In P2P live streaming system, service will be degraded when thousands of semi-riders, peers with very limited outbound bandwidth, concurrently join. Due to the limited outbound bandwidth, a semi-rider peer always gets more data than its contributions. In this paper, we propose VolunteerLive, an incentive-based P2P live streaming model, to address this issue. In VolunteerLive, these asymmetrical users are encouraged to "deposit" their bandwidth resources to relay data using their network bandwidth resources. They can enjoy the services as semi-riders in the future. We also propose ContriMax, a heuristics data scheduling algorithm designed for volunteers to collect and maximize the contributions of them. Simulations have been conducted to evaluate the performance of the proposed VolunteerLive and ContriMax. The results show that VolunteerLive model is feasible to support more semi-riders and greatly decrease the stress on the media server.

关键词： Bandwidth Peer to peer computing Scheduling algorithm Streaming media Algorithm design and analysis Pervasive computing grid computing Computer science Degradation Relays

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Building an automated trust negotiation system

Building an automated trust negotiation system

引用

International Conference on Information, Communications and Signal Processing

作者： Hai Jin Zhensong Liao Deqing Zou Chisong Li 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)9781424409822;1424409829

Automated trust negotiation (ATN) is an important means to establish trust between strangers through the exchange of digital credentials and mobile access control policies specifying what combinations of credentials a stranger must submit. While ATN provides a good mechanism to share resources in the distributed environments, there still exist some problems in ATN. A notable issue is that it is difficult to build a practical system. And no guidance is given on how to realize an ATN system. Previous work focused on presenting trust negotiation models or schemes, and most work aimed at protecting privacy and preventing sensitive information from leaking. In this paper, we pay much attention on how to build an ATN system, and design and implement a toy ATN system. We present a new means to implement access control policy, digital credential and its matching. A use case is studied to prove the toy system is sound and reasonable.

关键词： Access control Protocols Protection grid computing Computer science Mobile computing Privacy Authentication Authorization LAN interconnection

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