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Agent Perception CSCW environment

Author: WangZuo
Tutor: WangXiaoLin
School: Shandong University
Course: Applied Computer Technology
Keywords: CSCW Agent Perception Event Publish/subscribe
CLC: TP393
Type: Master's thesis
Year: 2005
Downloads: 84
Quote: 2
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Abstract

CSCW is a group finishes a common task working in cooperation, under the environment of computer network. Cooperation is a main characteristic of CSCW. The focal research point of MAS lie in how to coordinate behavior of Agents in a system so that they can works in coordination. This is similar with CSCW system. Contrast to the limitation of traditional customer/client mode in CSCW, research in coordination of MAS can give the better resolve way to CSCW. Study many Agent in coordination with the perception problem of solving cooperating between members first, the good cooperation perceiving of every user is the basic prerequisite of working in coordination.Based on the above research background, this paper apply Agent technology in CSCW environment, describe CSCW system with MAS model, construct a instant messaging system CIMS based on CSCW.CIMS adopt JMS publish/subscribe system as message middleware, realized the asynchronous communication among Agents, because of the Agent character of event driven and the advantage of event communication mode, CIMS adopt the communication mechanism based on event. This paper has carried on further investigation on perception question between many Agents in CIMS. It analysed the deficiency that existing Agent perception body model have, through structuring and optimizing Agent perception body ’s structure framework to improve the efficiency of perceiving, thus promote the completion of cooperating between Agents. This paper has carried on innovation from two following respects on perception body of Agent mainly.Publish/subscribe message system can offer reliable asynchronous communication between agents of loose coupling. This paper on the basis of original Agent conceptual model, proceeds from practical angle, regarded JMS publish/subscribe system as idiographic environment that Agent apperceived, adopt event communication mode, Construct a model of the perception body which is suitable forasynchronism cooperation of Agents. It proposes an Agent perception body framework model that takes event process as the core and include event obtain module, event filter module and event process module, give the definition and mechanism of realization.Event process module is the core of Agent perception body model. The traditional perception body just changes the form of the event and carry on simple distribution to it according to the type of the event. In view of the problem of event’s mass, variety and pertinence, this paper classified events in the system to simple event and composition event. The module of event process research the compose mechanism mainly. Proposed the event compose network ECN on the basis of existing tree-like structure compose mechanism, provide the corresponding compose algorithm and realization. ECN defined its own crunode structure, property characteristic, expand the expression of the compose rule from tree-like structure to net structure, improve the rationality and dependability of event compose, reduce the redundantly storage, improve the compose efficiency, overcome the shortcoming of the compose regular singularity and difficult to expand that exist in the tree-like expression.Meanwhile, we invocated introduce time controlling mechanism "dynamic timer" in the process of event composition, overcome the problem of time-lapse and out-of-order that caused when the event was transmitted in the network, guarantee the accuracy that the dependent event composite, offered the reliable guarantee for systematic decision.We have designed and realized the perception body model framework that is put forward. And apply it in CIMS, verified the rationality and efficiency of the framework. The Agent model that was proposed in this paper still have much need to be ameliorate and improve. For example, how to build the relevancy database to expand ECN? How to treat the feedback event from action body? And so on. Hope these would be studied and realized in the succeeding work.

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