面向水利应用的网格计算平台设计与实现

针对现有水利应用系统在复杂业务应用中的困境,并结合水问题的特点,设计开发了水利应用网格平台系统。该系统提供了B/S和C/S相结合的用户服务模式,实现了基于角色的用户访问控制,以及基于工作流模式的作业管理服务,并利用心跳机制对节点进行实时监控。     

基于网格服务的协同设计平台的设计

为充分利用产品设计合作企业的资源和个体优势,更好地支持企业产品协同设计,从协同设计平台功能需求出发,研究了基于网格服务的协同设计平台的体系结构、资源集成与共享、网格服务实现、网格门户实现等关键技术,构建了基于网格服务的协同设计平台.该平台通过开放网格服务框架,实现了合作企业软件集成和设计资源共享,提高了资源的利用率和产品设计的质量.最后通过机械产品协同设计表明了该平台的有效性.     

DartGrid II: a semantic grid platform for ITS

Intelligent transportation systems offer an alternative approach to solving many problems by implementing advances in information, Internet, communication, and cybernetics technologies. Grid computing can support traffic data semantization, resource sharing, ITS subsystem cooperation, and global-scale distributed computing that connects all kinds of resources. We are currently using grid technology to build DartGrid II, a semantic ITS platform to support resource sharing, service flow management, and cross-domain cooperation.     

基于数据网格技术的可共享e-Learning平台的设计

e-Learning已成为最受欢迎的教学方式之一.SCORM作为最流行的e-Learning标准已被不同的e-Learning平台采用.只要符合SCORM标准的课件就可以被其它e-Learning平台共享.但是大多数的e-Learning平台不能直接在Intemet上共享课件.基于这个问题,采用称为数据网格的网格计算技术,设计了一个可共享的e-Learning平台,可以整合不同的SCORM平台形成一个大型的分布式e-Learning环境.     

基于GIS的电网规划系统设计与实现

电网规划是电网建设的关键环节,电网系统的规划是一项非常复杂的工程.传统的电网规划方法中电网信息与地理信息的脱节,因此存在诸多局限性.结合华东某电网公司电网建设规划需求,设计并实现了基于GIS的电网辅助规划平台.首先描述了电网规划平台的特点以及对系统需求,从方便用户操作和满足规划用户需求的角度,给出了规划平台的系统架构,然后给出了关键模块的解决方案,最后示范了系统应用.     

一种轻量级网格平台参考模型研究

基于OGSA的网格平台具有“富特征（feature-rich）”结构,软件冗余度高,在适应性、重配置和重部署等方面具有很大局限性。以构件作为功能实现载体,以服务作为功能组织手段,提出了一种用于指导Internet环境下轻量级网格平台建设的参考模型。深入地阐述了参考模型的有关概念和工作过程,分析了基于本体的构件交互机制,建立了基于分层排队网络的性能分析模型和基于依赖关系的可靠性分析模型;最后,总结和展望了参考模型的研究工作。     

A user-friendly platform for developing and accessing grid services

This article presents an enhanced platform that provides a friendly environment of developing grid services and accessing grid services over Globus Toolkit 3 (GT3). This platform includes a class of functions for processing parameters input from a developer via GUI, a class of functions for generating files required for defining a grid service specified, and a class of functions for creating client program and facilitating accesses of the deployed services. As a result, the development and access of grid services requires less special expert knowledge of a developer at the server side and users at the client side, the efficiency of developing and accessing grid services can be improved. This paper describes our design ideas, necessary functions, and implementations. The comparisons with other related toolkits are given and the extended version of the platform on top of the web service environment rather than GT3.

Towards a framework for the development of adaptable service-based applications

Service-oriented computing is a promising computing paradigm which facilitates the composition of loosely coupled and adaptable applications. Unfortunately, this new paradigm does not lend itself easily to traditional software engineering methods and principles due to the decentralised nature of software services. The goal of this paper is to identify a set of engineering activities that can be used to develop adaptable service-based applications. Rather than focusing on the entire service-based application development life-cycle, this paper will focus on adaptation-specific processes and activities and map them to an existing high-level service-based application development life-cycle. Existing software engineering literature as well as research results from service engineering research is reviewed for relevant activities. The result is an adaptation framework that can guide software engineers in developing adaptable service-based applications.     

A scalable P2P platform for the knowledge grid

The knowledge grid needs to operate with a scalable platform to provide large-scale intelligent services. A key function of such a platform is to efficiently support various complex queries in a dynamic large-scale network environment. This paper proposes a platform to support index-based path queries by incorporating a semantic overlay with an underlying structured P2P network that provides object location and management services. Various distributed indexing structures can be dynamically formed by publishing, semantic objects as indexing nodes. Queries are forwarded along the chains of semantic object pointers to search for objects. We investigate the deployment of a scalable distributed trie index for broadcast queries on key strings, propose a decentralized load balancing method for solving the problem of uneven load distribution incurred by heterogeneity of loads and node capacities and by the distributed trie index, and give an approach for improving the availability of the semantic overlay and its trie index. Experiments demonstrate the scalability of the proposed platform.     

A knowledge grid model and platform for global knowledge sharing

This paper proposes a knowledge grid model for sharing and managing globally distributed knowledge resources. The model organizes knowledge in a three-dimensional knowledge space, and provides a knowledge grid operation language, KGOL. Internet users can use the KGOL to create their knowledge grids, to put knowledge to them, to edit knowledge, to partially or wholly open their grids to all or some particular grids, and to get the required knowledge from the open knowledge of all the knowledge grids. The model enables people to conveniently share knowledge with each other when they work on the Internet. A software platform based on the proposed model has been implemented and used for knowledge sharing in research teams.     

商业软件的并行网格计算平台模型及实现

以ANSYS和FLUENT为例,分析了商业软件在工作站机群并行运行的优势.将并行运行与网格计算相结合,提出了两者结合的软件结构和硬件结构,实现了并行计算资源的Web发布,从而提高商业软件和高性能计算资源的利用率,为大规模科学工程计算提供了良好的运算平台.同时平台实现用户认证,过载保护和实时监控功能.     

基于语义网格的E-Learning平台研究

E-Learning是信息时代重要的学习方式,它旨在打破时间和空间的限制,支持大规模范围的资源共享和学习协作,提供个性化和自适应的学习环境.在分析语义Web和网格计算对E-Learning开发的支持作用的基础上,提出了基于语义网格的E-Learning平台体系结构框架,面向服务的语义网格中间件是核心.对提出的E-Learning平台体系结构框架的层次结构进行了分析,描述了各层的功能划分和组成,最后探讨了通用E-Learning平台的组件化构建策略.     

Design of a reconfigurable prognostics platform for machine tools

For decades, researchers and practitioners have been trying to develop and deploy prognostics technologies with ad hoc and trial-and-error approaches. These efforts have resulted in limited success, due to the fact that it lacks a systematic approach and platform in deploying the right prognostics tools for the right applications. This paper introduces a methodology for designing a reconfigurable prognostics platform (RPP) which can be easily and effectively used to assess and predict the performance of machine tools. RPP can be installed on the equipment and it has the prognostic capabilities to convert the data into performance-related information. The equipment performance information can then be integrated into the enterprise asset management system for maintenance decision making through the Internet. Two industrial cases are used to validate the effectiveness of applying the RPP for different prognostic applications as well as the reconfigurable capabilities of the proposed RPP.     

The deployment and evaluation of a bioinformatics grid platform - The HUST_Bio_Grid

This paper reports our experience in the deployment of the Hust_Bio_Grid platform, which is a grid sub-platform that is specifically tailored towards the needs of bioinformatics. It enables the collaboration of multiple research institutes and facilitates the sharing of resources such as hardware, database software tools, etc. In particular, this paper presents a case study that addresses the deployment and reuse of services and applications through a standardized easy to use interface. It discusses the deployment of services including the requirements, the interface and the deployment process as a whole. Selected example services are discussed and relevant performance evaluations are presented. Through this scheme, all users including domain specific experts as well as generic software developers can contribute and deploy their own applications to the grid platform in a simple and efficient way. Thus, the actual functionality of the overall platform and the usability thereof is defined through the actual consumers and their specific needs.     

桌面网格中面向检查点的任务调度策略研究

为了提高桌面网格中资源的利用率,在FCFS(first come first service)调度的基础上,利用了检查点技术,提出与描述了几种高效的任务调度策略:FCFS-AT(adaptive timeout),FCFS-TR(task replication),FCFS-PD(prediction on demand)等。分析了调度策略对资源挥发性与不可用所带来的负面影响,建立了实验环境,采用对子任务数据跟踪的工具,在不同的设置条件下对这些调度策略上进行了测试。测试结果表明,大部分的检查点调度策略都比经典的FCFS算法性能好,检查点的数目也影响系统的性能,但是影响不是很明显。     

Design of a reconfigurable platform manipulator

Modular robots introduce a new dimension to flexible automation in terms of hardware flexibility, in addition to the software flexibility, in terms of yielding individual global optimal configuration for each of the tasks at hand. The mechanical structure of fully parallel manipulators is very suitable for reconfiguration since those manipulators are actuated in parallel. To really achieve effective and convenient reconfiguration, however, there are design and planning issues to be addressed. In this article the conceptual design and actual construction of an experimental platform manipulator are presented. This experimental platform is built as a tool to aid our research on the design and planning issues related to reconfiguration of parallel manipulators. © 1998 John Wiley & Sons, Inc.     

Intelligent dynamic workflow support for a ubiquitous Web service-based manufacturing environment

The ubiquitous environment is increasingly being considered as a platform for finding and integrating separate distributed services. Individuals or businesses can provide their services in the form of Web services in such a ubiquitous environment, and business processes that integrate such ubiquitous Web services can be formed using workflow technology. Workflow design and execution in such a dynamic and distributed environment needs to be very flexible in terms of incorporating changes. Web services may suddenly become unavailable and backup services may need to be found, or several providers of services may not be identifiable at the design time of the workflow. Therefore, dynamically finding and invoking Web services based on the workflow semantics need to be supported. BPEL4WS is the most popular and promising language among the workflow design languages for Web services. However, one of the problems with BPEL4WS is that it references the fixed WSDL file, which makes the workflow less flexible in dynamic and ubiquitous environments. Another problem is that it limits the amount of resources to only those that are specified. This makes it difficult to support semantics for finding similar or backup services in a ubiquitous network. This paper focuses on extending the BPEL4WS framework to include semantics by adding semantic constructs into WSDL and making use of ontologies in the BPEL4WS engine in order to support dynamic workflows suitable for ubiquitous environments.     

异构数据库统一平台设计与分析

研究了集成系统的设计并实现了异构数据源的集成。接着对系统的架构、用户请求解析模块、数据集成与格式化等问题做了详尽全面的分析与设计。最后以一个实例完整展示了异构数据源的集成过程,实现了数据源业务逻辑的封装与热部署。     

基于网格的神经网络计算平台的架构

介绍了神经网络计算平台在网格上的架构。由于神经网络应用环境的复杂性及要求处理大量数据的问题,从而神经网络计算需要超强的计算能力,因此在神经网络计算平台中引入了网格的思想,力图建立一个基于网格的神经网络计算平台。平台使用Globus工具,采用了统一控制和完全托管的思想。鉴于神经网络算法的复杂性和大数据量,神经计算算法在网格上进行适合各自特性的分解。