Research And Application On Water Environment Analytic Model-base Management Based On Model Entity Standard

As an information system assisting human beings to make decisions, Decision Support System (DSS) has been well studied and widely used. Model base system, the core of DSS, consists of model base and model base management which is the key of the system and impacts directly on the practicality of DSS. Additionally, model classification management (model property to model class) for application of the model base is an important approach to implement the intelligent model selection. With the development of the science and technology, a lot of models were accumulated in many fields. With daily spread of the model system scale and addition of the model sharing difficulty, study on model management would be very meaningful.This paper takes science and technology plan program of ChongQing (CSTC 2006AA7024)"Research on Water Environment Security early Warning Platform and Key Technology of Science Decision in Three Gorge Region"as application back ground, the research on water environment analytic model base management based on model entity standard is carried out.Firstly, the paper studied and analyzed model base management, model classification management and model base application. Aiming at the existing model base system's lower efficiency and poor scalability, analytic model management method based on model entity standard was proposed. It summarized the existing methods of model representation, built standard of the model entity which was established by Dynamic Link Library (DLL), designed the corresponding database and implemented model management block.Secondly,because water environment analytic model was difficult for users to select a favorable model for their variety and high specialization, an improved classification method (T_ID3) based on ID3 and Property Closer Degree principle was used to classify models. It proved ID3 algorithm having multi-value problem,summarized some improved algorithm of multi-valued bias and made an approach to properties with default values. Then water environment model classification management was implemented respectively through ID3 algorithm and T_ID3 algorithm.At last, an analytic model application method based on service and request was used to solve the share difficulty of information resource. A service-request mechanism was developed and a model call process was established,which implemented the communication between server and client. Then this method was applied to Water Environment Security early Warning Platform and Key Technology of Science Decision in Three Gorge Region, implemented the sharing of models and obtained a desired application result.In conclusion, above works can effectively overcome the existing model management's gaps and support for Water Environment Security early Warning Platform and Key Technology of Science Decision in Three Gorge Region. Moreover, practical application proved this method feasible.