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检索条件"机构=Cluster and Grid Computing Laboratory"

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Anysee: Multicast-based Peer-to-Peer Media Streaming Service System

Anysee: Multicast-based Peer-to-Peer Media Streaming Service...

引用

Asia-Pacific Conference on Communications

作者： Chao Zhang Hai Jin Dafu Deng Sirui Yang Quan Yuan Zuoning Yin Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9780780391321

In this paper, we propose a peer-to-peer live media streaming system based on application layer multicast, called Anysee, which provides efficient live media streaming service to large scale number of users. We construct the overlay data delivery tree with high locality and low maintenance overhead. The simulation results with log traces gathered from almost 7,200 users have shown that Anysee performs excellent even in a dynamic user environment

关键词： Streaming media Peer to peer computing Monitoring Web and internet services Chaos grid computing Large-scale systems Size control Testing Spatial databases

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Single stream image and stream network prefetch in streaming media proxy caching

Single stream image and stream network prefetch in streaming...

引用

International Conference on Advanced Information Networking and Applications (AINA)

作者： Hai Jin Chao Xie Kaiqin Fan Rong Hu Yunfa Li Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)0769522491

As demands for streaming video and audio over the Internet gains more and more popularity, proper caching of multimedia streams has become increasingly important. Previous researches on caching proxy have not addressed the problem of single stream image and stream network prefetch. In this paper, we discuss principles and mechanism of SSI in detail. Specifically, we give corresponding modification algorithms for receiving and sending streaming data in the caching proxy. After analyzing of different scenarios of stream network prefetch, we present a theoretical model of stream network prefetch. According to this model, we propose an effective stream network prefetch policy based on RTCP packets feedback and RTP packets network delay. Testing results show that our proposed mechanisms are valid and effective.

关键词： Streaming media Prefetching Intelligent networks Feedback Testing Internet Delay effects Jitter Chaos grid computing

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Tree-like hierarchical model for distributed micro-security system

Tree-like hierarchical model for distributed micro-security ...

引用

International Symposium on Parallel Architectures, Algorithms and Networks (ISPAN)

作者： Qin Zhang Hai Jin Chuanjiang Yi Liping Pang Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)0769521355

This paper presents a large-scale dynamic self-immune security architecture. In this architecture, a network is modeled as a hierarchy of administrators and hosts. We use a tree-like hierarchical model to guarantee security, scalability and availability of the system. We adopt a simple SSL-based authentication protocol to avoid unauthorized access to administrators, a group management mechanism for trust model, and two fault-tolerant schemes to address single point of failure of administrators.

关键词： Protection Peer to peer computing grid computing Computer architecture Scalability Large-scale systems Distributed computing Network topology Authentication Access protocols

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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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Middleware Based High Performance and High Available Database cluster

Middleware Based High Performance and High Available Databas...

引用

International Conference on grid and Cooperative computing (GCC)

作者： Zhiyuan Shao Hai Jin Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

In this paper, we propose a novel scheme that can be used to build high performance and high available database cluster. This scheme employs a middleware approach, which can replicate the databases on the server nodes of a cluster and keep them consistent during the fly. Read-one-write-all strategy is used to execute the read only queries of the concurrent transactions in parallel so as to improve performance. Compared with other replication schemes, such as PostGreSQL-R, this scheme does not need to consider the underlying details of database management system, and thus has the advantages of flexibility and portability. The simulation results show that this method yields better performance than traditional database replication techniques and lower abort rate

关键词： Middleware Database systems Transaction databases grid computing Availability Project management Buildings Control systems Explosions IP networks

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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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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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Dependency-aware Maintenance for Dynamic grid Services

Dependency-aware Maintenance for Dynamic Grid Services

引用

International Conference on Parallel Processing (ICPP)

作者： Hai Jin Li Qi Song Wu Yaqin Luo Jie Dai Cluster and Grid Computing Laboratory Service Computing Technology and System Huazhong University of Science and Technology China

Any mistaken maintenance for the complicated and distributed grid can bring unpredictable disaster. Here we focus on the system availability issues caused by service dependencies during the maintenance in grid. A novel mechanism, called Cobweb Guardian, is proposed in this paper. It provides multiple granularities (service-, container-, and node-level) maintenance for service components in grid. By using the Cobweb Guardian, grid administrators can execute the maintaining task safely in runtime with high availability. The evaluation results show that our proposed dependency-aware maintenance can make the grid management more automatic and available.

关键词： Availability Runtime grid computing Computers Software maintenance Scalability Project management Parallel processing Containers Costs

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A Layered-Rings Overlay Network for On-demand Media Streaming Service and Its Performance Analysis

A Layered-Rings Overlay Network for On-demand Media Streamin...

引用

International Conference on Autonomic and Autonomous Systems (ICAS)

作者： Dafu Deng Hai Jin Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

Peer-to-peer media streaming service has gained-tremendous momentum in recent years. However, a number of challenges intrinsic in peer-to-peer media streaming have not been addressed. In this paper, we propose a peer-to-peer substrate for supplying on-demand media streaming service, called LRONet, which mainly addresses the key technical issue-constructing a locality-aware P2P overlay network with high scalability and manageability. Based on modeling the underlying physical network as a random graph with power-law distributions, we theoretically analyze the performance of LRONet. Numerical results show that LRONet can fully utilize the locality of underlying physical network so that the bandwidth consumption can be effectively saved

关键词： Streaming media Performance analysis Peer to peer computing Scalability Network topology grid computing Bandwidth File servers Network servers Buildings

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QoS oriented dynamic replica cost model for P2P computing

QoS oriented dynamic replica cost model for P2P computing

引用

International Conference on Distributed computing Systems Workshop

作者： Feng Mao Hai Jin Deqin Zou Baoli Chen Li Qi Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)0769523285

Replication to multiple nodes is an effective way to improve the availability in the P2P environment. It is difficult to determine how many replicas can fulfill the availability of user request, because of the unreliable peers, networks and uncertainty of user access mode. We emphasize the availability QoS in the way that replica number should be adaptive to both user demands on service capability and system environment. Aiming to supply service to users with availability QoS at a low replica cost, we introduce a replica cost model to predict the optimal replica number and dynamically control the replicas number and the cost. We compare the cost and availability in our system to those in others under different cost strategies. The result shows that our system provides better availability QoS at an optimal cost. The cost strategies in our model can be flexibly reconfigured according to the replica service providers.

关键词： Availability Cost function Predictive models Peer to peer computing grid computing Uncertainty Optimal control Redundancy Adaptive systems Topology

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