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As the Three Gorges Dam has put into operation, it is necessary to develop a co-scheduling navigation system for both the Three Gorges Dam and the Gezhouba Dam. The Navigation Co-scheduling System for the Three Gorges-Gezhouba Dams aims at ensuring safe, convenient and smooth navigation of the ships passing through both dams. The design and implementation of the Navigation Co-scheduling System for the Three Gorges-Gezhouba Dams are described. The general situation and core requirements are analyzed, followed with the structure of the Navigation Co-scheduling System, which is developed under Sun Microsystems's J2EE Architecture. Then we mainly focus on core J2EE patterns and in detail show how those design patterns, such as Front Controller, Intercepting Filter, Service Locator and Data Access Object Factory Strategies, are used and applied in different layers.

Evaluation exists in all kinds of trades, where the justness of evaluation and the preferences of evaluating experts have been brought into focus extensively. However, the research on justness of evaluation is still at the initial stages. This paper considers the justness of evaluation using the SVD (singular value decomposition) and dimensionality reduction model, analyzes "common judgment" of experts in evaluation. This paper contrasts the sort order of the evaluation objects according to the primary data with that after applying this model. Further, this paper use cluster analysis method to classify evaluating experts, likewise, after applying SVD&DR model.