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

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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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Q-SAC: toward QoS optimized service automatic composition 05

Q-SAC: toward QoS optimized service automatic composition

引用

IEEE/ACM International Symposium on cluster computing and the grid (CCgrid)

作者： Hanhua Chen Hai Jin Xiaoming Ning Zhipeng Lu Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9780780390744

The emerging service grids bring together various distributed services to a 'market' for clients to request and enable the integration of services across distributed, heterogeneous, and dynamic virtual organizations. In the experience of constructing and using the Chinagrid, we meet two challenges, optimizing the QoS of the grid resources and minimizing complexity for application users and developers. In this paper, we present Q-SAC, a QoS optimized service automatic composition model to address these problems. Two main features of Q-SAC are (1) automatic grid service composition, and (2) global level multidimensional QoS optimization for the composition plan. We design the algorithms for generating and optimizing the composite services. The simulation results show that our model and solution are practical and efficient.

关键词： Quality of service Application virtualization grid computing Multidimensional systems Algorithm design and analysis Design optimization Computational modeling Distributed computing Computer architecture Middleware

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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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Collaboratively Scheduling to Decrease Inter-AS Traffic in P2P Live Streaming

Collaboratively Scheduling to Decrease Inter-AS Traffic in P...

引用

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

作者： Xuping Tu Hai Jin Xiaofei Liao Weidong Wang Sirui Yang Qi Huang Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

In the existing data fetching algorithms for P2P streaming systems, the peers usually fetch data independently, leading to huge inter-AS traffic (AS: autonomous system). This paper proposes CoFetch, a collaborative fetching algorithm for P2P live streaming systems to decrease inter-AS traffic. In CoFetch, to avoid that all peers fetch the same data from inter-AS connection, instead of aggressively fetching data depending on the peers' own desires, the peers divide requests into multiple steps. In each step, peers mainly and locally share data fetched in previous steps by other collaborating peers and request subset data from inter-AS connections. The analytical results show that, inter-AS traffic in CoFetch is independent of the number of peers in AS but the number of collaborating peers in AS. Furthermore, in each overlay, when we limit the number of collaborating peers in one AS from 5 to 20, the inter-AS traffic is about 1.7-3 times of the streaming rate, regardless of the number of peers.

关键词： Telecommunication traffic Peer to peer computing Network topology Application software Collaborative work International collaboration Processor scheduling grid computing Computer science Electronic mail

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A fuzzy data mining based intrusion detection model

A fuzzy data mining based intrusion detection model

引用

IEEE Workshop on Future Trends of Distributed computing Systems

作者： Hai Jin Jianhua Sun Hao Chen Zongfen Han Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)0769521185

With explosively increasing information, data mining techniques are frequently employed to identify trends in the warehouse that may not be readily apparent. In this paper we apply fuzzy data mining techniques to a security system and build a fuzzy data mining based intrusion detection model. Through normalizing the data set and building a fuzzy similar matrix of the network connections in the data set, network connections are clustered into different classes.

关键词： Data mining Intrusion detection Fuzzy logic Fuzzy systems Fuzzy sets Neural networks Sun grid computing Data security Information security

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IOStreaming: Intersecting-Overlays Based Live-Streaming Services

IOStreaming: Intersecting-Overlays Based Live-Streaming Serv...

引用

International Conference on Systems and International Conference on Mobile Communications and Learning Technologies, (ICN/ICONS/MCL) International Conference on Networking

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

To provide live streaming services based on peerto- peer overlays is popular now. Previous researches put their emphasis on how to improve overlays efficiency with single overlay optimizations. These optimizations have drawbacks such as low resources utilization, high startup delay and source-to-end delay, and unreasonable resources assignment in global P2P network. To solve these problems, we propose an Intersecting-overlays optimizations scheme in this paper. This new idea has the following characteristics: 1) basically it can improve resources utilization of global P2P network; 2) resources can be assigned reasonably with the consideration of locality and delay; 3) streaming services qualities, such as delay and playback continuity, can be improved greatly. To prove the idea, we carry out several simulations and compare with traditional system. Results from simulations are quite encouraging, high resources utilization and good QoS of streaming services.

关键词： Streaming media Delay Peer to peer computing Bandwidth Multicast protocols grid computing Real time systems Design optimization Topology Mobile communication

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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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引用

2009 IEEE International Conference on Information and Automation(2009年 IEEE信息与自动化国际学术会议)

作者： Zehua Lv Hai Jin Pingpeng Yuan Services Computing Technology and System Laboratory Cluster and Grid Computing laboratoryHuazhong University of Science and TechnologyWuhan430074China

Interval Type-2 Fuzzy Sets (IT2 FSs) has been used in wide range of applications, such as decision making, pattern recognitions. However, there is little investigation on the clustering techniques of IT2 FSs, since it is very important for measuring the degree of similarity between interval type-2 fuzzy sets in clustering research. In this paper, we give a novel method to represent interval type-2 fuzzy sets by a series of linear functions. This method is named as triangular representation because the curves of the functions and the coordinates shape into triangles. A new kind of similarity between interval type-2 fuzzy sets based on triangle is given and the validity of this method is proven. Furthermore, several numerical examples are given to show that the proposed similarity measure is reasonable and better than any existing methods.

关键词： Fuzzy sets Frequency selective surfaces Laboratories Pattern recognition Uncertainty Computers grid computing Electronic mail Decision making Automation

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A New Approach for Hiding Policy and Checking Policy Consistency

A New Approach for Hiding Policy and Checking Policy Consist...

引用

International Conference on Information Security and Assurance, ISA

作者： Deqing Zou Zhensong Liao Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Huazhong University of Science and Technology Wuhan China

Automated trust negotiation (ATN) is a new means to establish trust relationship through the mutual exchange of access control policy and credentials in the open and distributed environments. In ATN, access control policy plays a key role in protecting resources from unauthorized access. In practice, a policy may contain sensitive information, and its disclosure may cause damages. In order to protect the sensitive policy or its content, the policy is usually designed complex. Even worse, the policy may be self contradictory, which would lead the negotiation to fail. To solve such a problem, a new approach for checking policy consistency is proposed in the paper. In the approach, we analyze why the policy inconsistency happens and specify how to avoid it by simplifying a compound policy. Meanwhile, the approach is proved useful to hide policy by presenting some useful theorems to generate minimal policy set and credential set.

关键词： Access control Protection Privacy Internet Information security grid computing Computer science Resource management Application software National security

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Optimization of asynchronous graph processing on GPU with hybrid coloring model 2015

Optimization of asynchronous graph processing on GPU with hy...

引用

20th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming, PPoPP 2015

作者： Shi, Xuanhua Liang, Junling Di, Sheng He, Bingsheng Jin, Hai Lu, Lu Wang, Zhixiang Luo, Xuan Zhong, Jianlong Services Computing Technology and System Lab. Cluster and Grid Computing Lab. School of Computer Science and Technology Huazhong University of Science and Technology China Argonne National Laboratory United States School of Computer Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)9781450332057

Modern GPUs have been widely used to accelerate the graph processing for complicated computational problems regarding graph theory. Many parallel graph algorithms adopt the asynchronous computing model to accelerate the iterative convergence. Unfortunately, the consistent asynchronous computing requires locking or the atomic operations, leading to significant penalties/overheads when implemented on GPUs. To this end, coloring algorithm is adopted to separate the vertices with potential updating conflicts, guaranteeing the consistency/correctness of the parallel processing. We propose a light-weight asynchronous processing framework called Frog with a hybrid coloring model. We find that majority of vertices (about 80%) are colored with only a few colors, such that they can be read and updated in a very high degree of parallelism without violating the sequential consistency. Accordingly, our solution will separate the processing of the vertices based on the distribution of colors.

关键词： Graphics processing unit

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