There are various evaluation indicators in command information system. It is important to determine the weight of each indicator because it has a direct impact on the final result for evaluation and decision making. The reasonable and accurate attribute weight is helpful to ascertain the status or effect on the policy decision. With analyzing the deficiency of attribute weighting algorithms based on the rough sets theory, the new attribute weight algorithm is proposed in the paper. The proposed algorithm considers objective weight and subjective weight. The objective weight includes three factors, named as the importance of the attribute itself, the increment of mutual information, and its own information entropy. The subjective weight is obtained by the experts with prior knowledge in the field. Experiment results prove that the new method not only overcomes the deficiency of the existing weight methods, but also is more in line with the actual situation.
The structural character of breech mechanism is studied and analyzed in order that the virtual prototype model is the best. By the CAD software Pro/Engineer the XX breech mechanism virtual prototype is built. At first, the 3D modeling of the XX Breech Mechanism is generated with the parametric design and virtual assembling, and experiment platform of virtual prototype including all kinds of conditions is set up. At last, the quantitative analysis is performed on the above experiment platform, the experiment resulting is accord with specification data by and large, which validates that the designed breech mechanism virtual prototype is proper and appropriate.
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