基于知识的P2P网格资源发现研究*

针对当前网格资源管理系统扩展性差的问题,提出了具有分布式本体知识库的网格资源管理模型.新模型由分布的多个自治管理域组成;自治域之间通过DHT覆盖网连接.网格资源信息以本体知识库的形式管理:本地知识库管理域内网格知识;全局知识库则提供分布本体的语义映射以及知识的索引和定位.资源发现转换为本体知识库的实例检索推理,并且支持跨管理域的资源集发现.新模型极大地提高了网格资源管理系统的可扩展性.     

一种有效的分散式网格资源组织机制

对网络中分布的资源进行有效组织与调度是实现网格计算的关键。该文提出了一个以Spaces为核心的网格资源组织机制，以资源自治域的方式对网格内的资源进行划分，不同的资源自治域之间可以进行任务协作，多个分布可变的Space服务形成了对资源的有效聚合，提供了对资源访问的统一接口，给出了将该机制应用于一个大型企业的部署范例，为网格计算的资源组织提供了一种新方法。     

基于市场的网格资源分配管理模型研究

提出了一种基于微观经济学方法的网格资源分配管理模型,采用分布自治原则由众多的网格域构成整个网格系统。系统根据用户作业请求发出投标信息,各网格域参考投标信息及自身资源使用情况利用PSP拍卖机制确定中标者,最后系统从中标信息中选择费用最低的完成任务,以一定的周期运用微观经济学供需均衡原理动态调整资源价格。相对于别的网格资源管理系统,本模型提出的资源管理方案在管理上比较简单,系统不必掌握全局资源信息,可扩展性较强,易于实现,并且通过引入竞标机制解决了资源提供者的报酬问题。     

基于市场的网格资源分配管理模型研究

提出了一种基于微观经济学方法的网格资源分配管理模型，采用分布自治原则由众多的网格域构成整个网格系统。系统根据用户作业请求发出投标信息，各网格域参考投标信息及自身资源使用情况利用PSP拍卖机制确定中标者，最后系统从中标信息中选择费用最低的完成任务，以一定的周期运用微观经济学供需均衡原理动态调整资源价格。相对于别的网格资源管理系统，本模型提出的资源管理方案在管理上比较简单，系统不必掌握全局资源信息，可扩展性较强，易于实现，并且通过引入竞标机制解决了资源提供者的报酬问题。     

教育服务网格监控系统的研究与设计

监控系统LagridM用于教育服务网格中节点及资源信息的监控.通过对比分析当前网格计算项目中监控策略的特点与不足,结合教育网格节点分布的特点,选用层次式架构、分域管理,采用"传感器-传感器管理器-域监控服务-全局监控服务"的监控策略,对分布在广域范围内异构环境下的资源和节点进行监控,并对上层提供全面有效的服务.给出了监控功能模块的设计与实现,通过性能测试,证明了该系统安全、可行、有效,能满足教育服务网格平台下监控的需求.     

基于管理域的网格信息服务的研究与设计

对Web服务的相关技术进行了研究,描述了基于Web服务及管理域的网格信息服务的设计框架及流程,其中定义了一些基本概念,然后对网格信息服务做了全新设计并详细介绍了各层、各模块所发挥的作用以及它们之间的调用关系,结合资源实际分布与管理模式,采用了对网格资源信息基于管理域,及域内分布的信息结点协同缓存与管理的汇集与发布方式,实现了网格环境中各种资源的监测和高效使用,具有一定的灵活性,扩展性和容错性.     

教育服务网格监控系统的研究与设计

监控系统LagridM用于教育服务网格中节点及资源信息的监控。通过对比分析当前网格计算项目中监控策略的特点与不足,结合教育网格节点分布的特点,选用层次式架构、分域管理,采用＂传感器-传感器管理器-域监控服务-全局监控服务＂的监控策略,对分布在广域范围内异构环境下的资源和节点进行监控,并对上层提供全面有效的服务。给出了监控功能模块的设计与实现,通过性能测试,证明了该系统安全、可行、有效,能满足教育服务网格平台下监控的需求。     

信息网格跨域访问权限控制的研究

信息网格中资源的共享通过访问控制对合法用户和信息服务请求进行授权来实现,访问控制机制的采用受到信息网格的复合管理域特点的影响。本文阐述了信息网格访问控制的关键问题,分析了信息网格的多管理域特点,进一步提出了一个可以动态更新信息的复合式授权和查验机制,从而解决跨域访问带来的困难、简化管理操作。     

基于网格的物流资源挖掘模型的研究

分布在因特网上的物流资源具有地理分散和职权自治的特性，资源结构和接口难以统一。该文以网格、Agent和增量挖掘技术为基础，提出了不通过资源整合就能够实现全局信息挖掘的方法。分析了基于Web的物流资源网格系统，将其划分为物流域的集合实施分级管理。提出了新的面向网格的信息挖掘模型并设计了域内动态资源挖掘算法和域间请求式资源挖掘算法。该模型解决了不同物流系统之间的信息挖掘难题，算法中引入的增量挖掘技术提高了域间资源挖掘效率。     

基于计算经济的网格资源管理模型研究

由于网格中的资源具有分布性、自治性、异构性和动态性,对网格资源进行高效的管理是一个具有挑战性的问题.提出把移动Agent和Agent技术、计算经济机制引入网格资源管理.自治Agent利用双向拍卖经济杠杆的调节,以用户的QoS所驱动,对资源的使用进行竞价拍卖,使网格的资源管理能够自动适应环境的变化.提出的基于计算经济的网格资源管理模型DynamicSA,实现了以用户的QoS驱动,对网格资源的有效管理具有一定的理论意义.     

IPBGA: a hybrid P2P based grid architecture by using information pool protocol

The current representatives of Grid systems are Globus and Web services, however, they have poor scalability and single point failure. It is these two factors which make the building of an improved P2P and grid hybrid framework for resource management and task schedule such a popular research topic. This paper differs from current research because it puts forward an Information Pool Based Grid Architecture (IPBGA), which is a real sense hybrid of P2P and grid instead of only introducing P2P methods into grid systems for resource management. Based on virtualizations, abstract physical resources and tasks to be, the information requests from resources for tasks and appeals from tasks for resources are upgraded as information services by using an information pool protocol (IPP). Thus, grid resource management and task scheduling are regarded as information matching by IPP which is adaptive to the heterogeneous, dynamic, and distributed characteristics of a grid system. Tri-Information Center (Tri-IC) and source ranking mechanisms are presented in IPP to improve robustness, prevent sybil attack, and to discourage free riding. Experiments and theory analysis show that the IPP of the IPBGA is more efficient and robust in dealing with information while both the bandwidth and process costs are less.

织女星信息网格的体系结构研究

信息网格是以消除信息孤岛、实现信息共享、管理和服务的系统，其研究的核心问题是信息共享的新思路和共性技术。描述了织女星网格的设计框架和体系想方设法，介绍了面向用户行为的时空模型的基本概念和特征，并讨论了此体系结构技术和模型如何解决信息的表示、组织、显示、管理和处理中遇到的关键问题，从而提供通用服务、辅助智能、全局一体、自主控制的功能。     

分布式资源共享的网格信息服务的安全与容错

网格技术是新型的分布计算技术, 是解决复杂度越来越高的新应用的重要方法。信息服务是任何网格软件框架的重要部分, 它为发现和监控提供重要的软件机制, 也因此为系统的规划应用行为奠定了基础。在此基础上着重讨论了网格信息服务系统的安全和容错的问题, 指出网格信息服务系统的安全和容错是相互联系相互影响的, 这样的关系要求人们在解决这两个问题时将它们结合起来研究, 这样网格信息服务系统的整体性能将会有很大的提高。1001-3695(2005)03-0019-04     

网格中资源信息服务--元计算目录服务

网格计算环境中的资源具有海量性、分布性、异构性、自治性、动态性等特点。因此资源信息服务成为网格软件的关键技术之一。本文主要研究使用元计算目录服务MDS(Metacomputing Directory Service)构建网格系统软件中的资源信息服务,完成对网格计算环境中的信息的发现、注册、查询、修改等工作，提供对网格计算环境的一个真实、实时的动态反映.MDS的内容主要包括资源发现、资源描述和资源监视与更新。MDS在实现上主要使用轻量目录访问协议LDAP(Lightweight Directory Access Protocol)作为网格信息访问和存储的统一界面。     

Economics‐inspired decentralized control approach for adaptive grid services and applications

Grid technologies facilitate innovative applications among dynamic virtual organizations, while the ability to deploy, manage, and properly remain functioning via traditional approaches has been exceeded by the complexity of the next generation of grid systems. An important method for addressing this challenge may require nature‐inspired computing paradigms. This technique will entail construction of a bottom‐up multiagent system; however, the appropriate implementation mechanism is under consideration in order for the autonomous and distributed agents to emerge as a controlled grid service or application. A credit card management service in economic interactions is considered in this article for a decentralized control approach. This consideration is based on a preliminarily developed ecological network‐based grid middleware that has features desired for the next generation grid systems. The control scheme, design, and implementation of the credit card management service are presented in detail. The simulation results show that (1) agents are accountable for their activities such as behavior invocation, service provision, and resource utilization and (2) generated services or applications adapt well to dynamically changing environments such as agent amounts as well as partial failure of agents. The approach presented herein is beneficial for building autonomous and adaptive grid applications and services. © 2006 Wiley Periodicals, Inc. Int J Int Syst 21: 1269–1288, 2006.     

Reliability of grid service systems

Grid computing system is different from conventional distributed computing systems by its focus on large-scale resource sharing, where remote accessing and information communication have great influence on grid computing. As an important metric for services, the grid service reliability is studied in this paper. There are some earlier studies on the reliability analysis of conventional small-scale distributed systems, which ignored the communication time and processing time when studying the reliability, but it is not practical in the reliability analysis of grid services due to the wide-area property of the network. Thus, this paper presents a model for the grid services and develops an approach to analyze the grid service reliability. Detailed algorithms to compute the grid service reliability are presented and a self-sensing technology is proposed for parameterization and monitoring. A numerical example is used for the purpose of illustration. Finally, the new model is compared with different types of conventional models, through which this model is verified more suitable for grid service reliability.     

Urban Traffic Information Service Application Grid

Traffic information processing is very complicated because of dynamic, cooperative and distributed features.This paper describes the prototype system version 2.0 of Urban Traffic Information Service Application Grid (UTISAG),which is based on the previous version. In this version, a new architecture and more enhanced services are introduced.The remarkable characteristic of the new system is providing dynamic information services for travelers by grid technology.Therefore, the key research includes integrating large multi-source traffic data, forecasting route status, simulating regional traffic flow parallelly, and implementing optimum dynamic travel scheme based on massive GPS data.     

信息网格平台工作流程的实现

信息网格系统是利用网格技术实现信息资源的共享、管理和提供信息服务的系统。该文结合信息网格系统在企业信息共享研究和实施工作,分析了基于信息网格平台流程引擎的关键问题,提出了信息网格平台流程的体系结构,并讨论了实现细节,并就实际工程中的使用进行初步评价。     

Active Grid Information Server for grid computing

We describe the Active Grid Information Server for performing expressive resource discovery searches and resource management in a grid environment. We represent server meta-data, such as their CPU power, storage capacity and bandwidth as points in a multi-dimensional space and then express queries as predicates over these points. The design of the system is driven by its application as a part of the information infrastructure for computational grids. Such grids provide an infrastructure for sharing computing resources; an information infrastructure is their inherent part which collects resource data and provides search functionality. Our approach complements current solutions such as MDS by adding Event Condition Action rules and an ability to efficiently handle dynamic attributes. An Event Condition Action rule-based system can support ad hoc, adaptive, flexible, and dynamic schedulers that are modifiable at runtime. We evaluate our Active Grid Information Server by evaluating Event Condition Action rules for termination, confluence, and conflict.     

空间地理信息分发的网格模型与服务研究

提出了实现空间地理信息(SGI)远程分发的网格分发系统(GIGD)。以图的方式定义了网格资源节点，建立了SGI资源和网格资源的关系，给出了GIGD的形式化表示，构建了面向服务的6级分层网格模型，基于开放OGSA服务与接口定义模式设计了系列网格服务，实现了支持请求/应答服务模式、SGI无中心式网格分发的GIGD。资源查找过程中GridService和直接拷贝的性能比较表明：GridService的传输效率与直接拷贝模式相当，达到最大传输速率更快，对数据量的依赖性不强。