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IEEE Workshop on Future Trends of Distributed computing systems

作者： Aobing Sun Hai Jin Qin Zhang Ran Zheng 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

The heterogeneity, distribution and dynamicity of web services hamper WSRF (Web service resource framework) of grid to exert its excellences in resource integrations. In this paper, we propose our SOV (service orient virtualization) model for medical image grid (MedImGrid), which creates a virtual middle layer for grid to simplify the transformation from users' business aims to executable web-service instances. The layer adopts semantic based cross clustering means to support approximate optimal service selection from WSS (Web service set) to break through the hard-encoded mode of web-service based applications. It provides service-independent composition mechanism and can adjust a service composition path even during runtime. SOV utilizes the web services as the joint-point of grid, semantic and virtualization technologies so as to conceal the heterogeneities of low-level resources and surpass the limits of tightly-coupled mode to service composition within grid environment.

关键词： Biomedical imaging Web services Service oriented architecture Resource virtualization Application virtualization Semantic Web technology management Logic programming Conferences Distributed computing

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WFTXB: A Tool for Translating between XPDL and BPEL

WFTXB: A Tool for Translating between XPDL and BPEL

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IEEE International Conference on High Performance computing and Communications (HPCC)

作者： Pingpeng Yuan Hai Jin Shilun Yuan Wenzhi Cao Laiyuan Jiang Service Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

The Business Process Execution Language for Web services (BPEL) has emerged as the de-facto standard for implementing processes. While being a powerful language, BPEL is difficult to use. As a result only experienced users are able to select the right construct. However, XPDL, which was proposed by Workflow Management Coalition, are widely accepted by enterprises. Therefore, this paper presents a tool, named as workflow transformation system between XPDL and BPEL (WFTXB) to automatically translate workflow expressed in terms of XPDL onto BPEL, and vice versa. For transformation between XPDL and BPEL, the tool adopts the graph structure as intermediate language. During the transformation, the tool first analyses the structures of process, and gets the result of map-like structure, which is expressed with adjacency matrix. Then the tool scans the adjacency matrix and identifies the structure of block. Finally, the tool generates BPEL or XPDL code.

关键词： Business Web services Transforms Switches XML Process control computer languages

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An Asymmetrical Encryption Based automated trust negotiation model

An Asymmetrical Encryption Based automated trust negotiation...

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Inaugural IEEE-IES Digital Ecosystems and Technologies Conference, DEST

作者： Hai Jin Zhensong Liao Deqing Zou Chisong Li 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)9781424414895

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. As a certificate may contain sensitive information, unlimited disclosure will leak valuable information or jeopardize individual privacy. In order to prevent information leakage, the negotiation protocol is designed so complicated that a requestor is hard to attain the access. In addition, if the encryption algorithm is short in security intensity, the transmitting message over the public channel is easy to be attacked. To solve these problems, an asymmetrical encryption based ATN model (AEBM) is proposed in this paper. AEBM adopts credentials with a flexible format to meet the requirements of access control policies, instead of disclosing the whole contents of a certificate. Further, AEBM uses asymmetric encryption technique to encrypt the transmitting message, which can prevent information from leaking. AEBM presents a new negotiation strategy to enhance the negotiation efficiency. A use case is studied to prove that AEBM is sound and reasonable.

关键词： Cryptography Access control Protocols Public key Educational institutions Authentication Ecosystems

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Heterogeneous Medical Data Share and Integration on Grid

Heterogeneous Medical Data Share and Integration on Grid

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International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Ran Zheng Hai Jin Qin Zhang Yingshu Liu Pan Chu 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

It is very significant for the medical and health enterprises to develop an efficient medical information grid to achieve sufficient medical data share and integration. In order to access heterogeneous data resources transparently, front agent is built on heterogeneous databases or medical systems, the same as the unified data models and mapping rules with grid services to communicate with upper grid middleware, so that users can query or access medical data conveniently. Two medical application instances, medical information integration and content-based image diagnosis or retrieval of emphysema disease, are introduced and realized with these technologies.

关键词： Biomedical imaging Medical diagnostic imaging Image databases Data models Middleware Medical services Biomedical equipment Information retrieval Image retrieval Content based retrieval

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A Novel Virtual Grid Experiment Method in MedImGrid

A Novel Virtual Grid Experiment Method in MedImGrid

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IEEE/IFIP International Conference on Embedded and Ubiquitous computing, EUC

作者： Ran Zheng 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 China

During the study of grid projects, a real grid environment or simulated grid is built up for development and experiment normally. But there are some disadvantages such as high cost, complex deployment and configuration, hard management, even conflict among people. A novel virtual grid experiment method with HAL (Hardware Abstraction Level) virtualization technology is presented, which can conquer the disadvantages above and has been used in MedImGrid for the development of medical grid applications. The experiment shows that the method is feasible with low cost, easy configuration and convenient management, so as to increase research efficiency and shorten developing cycle. Furthermore, it can be applied not only in MedImGrid but also in some other grid projects.

关键词： Biomedical imaging Medical diagnostic imaging Grid computing Costs Application software Testing Computational modeling Hardware Application virtualization Medical services

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A Heterogeneous Data Parallel Computational Model for Cell Broadband Engine

A Heterogeneous Data Parallel Computational Model for Cell B...

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ChinaGrid Annual Conference (ChinaGrid)

作者： Bo Li 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

ISBN: (纸本)9780769533063

Cell broadband engine (Cell BE) is a state-of-the-art heterogeneous multi-core processor. It is an accelerator-based multi-core architecture, which contains a powerful 64-bit dual-threaded PowerPC core and eight high efficient single-instruction-multiple-data (SIMD) cores. Apart from traditional parallel systems, the users must explicitly manage the communication, scheduling and load-balancing to achieve cellpsilas greatest performance. In this paper, a novel heterogeneous data parallel computational model on cell BE is proposed. This aggressive model could not only exploit computing power of SPE but also that of PPE and aggregate them together to achieve high performance. We investigate the performance of this model with naive ray tracing algorithm. The preliminary experimental results validate the efficiency of this model.

关键词： Computational modeling computer architecture Data models Microprocessors Ray tracing Acceleration Optimization

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

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

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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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Information Value Evaluation Model for ILM

Information Value Evaluation Model for ILM

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

作者： Hai Jin Muzhou Xiong Song Wu Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan China Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9780769532639

The first step towards the information lifecycle management is to differentiate information by values. This paper presents an evaluation model for information value. The idea of the model is from commodity value discipline in economic area. The output of information value evaluation model is determined by information itself which is like commodity price is determined by use-value in economic area. The output of the model is changed around the real information value and controlled by the relationship between information supply and demand. The output of the model is determined by factors from three aspects that are information itself, information supply, and information demand. When applying the model into traditional information management approaches, such as replication, data migration, and backup, those mechanisms control the output of the model through adjusting the ability of information supply.

关键词： Biological system modeling Supply and demand Computational modeling Bandwidth Data models Economics Analytical models

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Fetching primary and redundant instructions in turn for a fault-tolerant embedded microprocessor

Fetching primary and redundant instructions in turn for a fa...

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14th IEEE Pacific Rim International Symposium on Dependable computing, PRDC 2008

作者： Zhang, Shijian Hu, Weiwu Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

ISBN: (纸本)9780769534480

With the development of semiconductor technology, microprocessors become more and more susceptible to transient faults. Some proposed schemes support redundant execution of a program in a superscalar processor for fault tolerance. However, they require a huge queue to accommodate interim states, which enlarge the hardware cost significantly. This paper analyzes the effect of halving a processor's instruction fetch bandwidth on a program's performance. We find that the performance degradation resulted from halving instruction fetch bandwidth declines when instruction latency is lengthened, branch prediction accuracy deteriorates or cache miss rate increases. Since an embedded microprocessor is characterized by long instruction latency, high branch misprediction rate and cache miss rate, a fault-tolerant scheme is proposed, in which two threads fetch instructions in turn and execute in the same processor core simultaneously without any extra queue. The simulation results from eight embedded applications show that performance penalty of our solution ranges from 6.5% to 30.1%, with an average of 22.5%, which is lower than that of the other proposed schemes. The experiment also indicates that our scheme can effectively detect faults occurring in the entire pipeline with short fault detection latency and minimal hardware cost. It is well suited for our solution to realize a reliable embedded microprocessor. © 2008 IEEE.

关键词： Fault detection

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A multicast based bandwidth saving approach for wireless live streaming system

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International Journal of Smart Home 2008年第1期2卷 65-80页

作者： Jiang, Wenbin Jin, Hai Liao, Xiaofei Yuan, Zhi Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan 430074 China Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan 430074 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

P2P based live streaming applications are growing up rapidly. However, when extending them to WLANs, the bandwidth bottleneck and the high rate of packet loss are usually the major stumbling blocks. To overcome this issue, a new wireless multicast agent mechanism (WiMA) based on the IP multicast scheme for buffer management and scheduling is proposed. First of all, a wireless agent selection method is presented to choose an appropriate agent for WiMA. Then this agent gains media data by interacting with wired neighbor peers as a common P2P node, and transmits these data to other wireless peers in the WLAN by means of multicast pushing and multicast patching. A normal wireless peer requests data according to the strategy of "emergent ones first". Experimental results show that the approach proposed can significantly save bandwidth in WLANs with acceptable start delay and satisfied playing continuity.

关键词： Wireless local area networks (WLAN)

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