Virtual Organization In Grid-based Information Distribution System

The Information Distributing System's purpose is distribute the information to the users who need it .The information of the system are so huge,so there mast be a rule to filtrate it.This rule is base on the users's customization and the potential users's need.Grid technology has great advantages in the management of information,it can integrate and manage the information resource which spread around different departments,actualize the exchangement of date between different organizations and institutions,remove the information island,break bootle-neck of the resources share;On the other hand,the distributing work moden of Grid technology can carry out the work together under the virtual network environment,improve the work efficiency of organizations and institutions, inforce the service ability.The Information Distributing System which is based on Grid can integrate all informations in the system,analyze the needs of users,so that the users can what they want without trouble.This thesis analyze the demoestic and overseas applications about the grid technology in information area.ngtroduce the concept,characteristic,three system structure of Gird and the mainstream of gird technology in nowerdays.Analyze the GIG System of USA, recommend the GIG's framework,systems tructure and main functions.Then use the GIG system as the example of the Information Distributing System which this thesis talk about.Point out that use the VO(virtual organizations) to the users and date management.Presetation the VO's concept ,characteristic, main functions and the life of VO.This thesis worked over how to use VO in the the Information Distributing System, how to use the VO to mamage the users and large scale data.Pointed out there are two kinds of VO,one is UVO(virtual organization for users)the other is DVO(virtual organization for data),UVO take charge of users's management,DVO take charage of data's management.So that can send the right information to the users who really need it.Thus recommend the plan how to make off the VO:1) Make the first partition according to the users's need and the data's attribute.2) Consider about the partition scale and the system resources's use up,choose the right scale.Then adjust the partition based on the first time.3) According the users'log,get the changement of the users's need.Think over the changement ,dynamicly adjust the partition.This thesis use the B/S mode,DB,JSP technology.Realize the VO's user management and dynamic partition.This thesis comes from a predict item.The research is only a little part of the VO's application.If need deeper research, there are many aspects such as the service that system provide,user's substitute and security and so on.