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中文摘要：
针对当前经济预警领域单一模型预测效果不理想，以及模型组合、管理和重用困难等问题，提出了采用面向服务的体系结构构建宏观经济预警平台，将单一预警模型发布为Web服务，并利用Petri网组合预警服务模型的方法，讨论了系统构建方法和服务组合的建模过程，验证了基于Petri网的组合服务模型能够保证组合服务的可达性、安全性、正确性和可终止性。
英文摘要：
Aiming at solving the problems of economic early warning system, such as the difficulty of model inte-gration, model management and model reuse, and the unsatisfactory effect of single early warning model, this pa-per has proposed a web service model of economic early warning system based on Petri-net. This model adopted service-oriented architecture and published early warning components by web service. We applied a standardized interface to make each component cooperate with each other. We presented an algorithm mapping the early warn-ing model to Petri-net, which was able to complete complex early warning application through services composi-tion. Moreover, we discussed the system construction method and key technologies for dynamic web services com-position. The results show that a composite service composed by Petri-net can insure the reachability, safeness, accuracy and boundness of the model.
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