Discretization Algorithm Based on Particle Swarm Optimization and Its Application in Attributes Reduction for Fault Data

In order to increase the fault diagnosis efficiency and make the fault data mining be realized, the decision table containing numerical attributes must be discretized for further calculations. The discernibility matrix-based reduction method depends on whether the numerical attributes can be properly discretized or not. So a discretization algorithm based on particle swarm optimization (PSO) is proposed. Moreover, hybrid weights are adopted in the process of particles evolution. Comparative calculations for certain equipment are completed to demonstrate the effectiveness of the proposed algorithm. The results indicate that the proposed algorithm has better performance than other popular algorithms such as class-attribute interdependence maximization (CAIM) discretization method and entropy-based discretization method.     

Reliability Analysis of Filtering Reducers Considering Temperature Correction and Shock Load of Space

Owing to some excellent properties (such as large transmission ratio, high reliability, high precision, large stiffness, small volume and long service life), filtering reducers are suitable for occasions with high requirements (e.g. space equipment). However, the tough working condition in space (including frequent changes of temperature, and large temperature difference combined with shock loads) may significantly affect the reliability. In this paper, the expressions of the minimal and maximal instantaneous transmission ratios (ITRs) considering temperature correction are developed. The minimal and maximal ITRs from simulation are used to verify the accuracy. Moreover, the reliability of a filtering reducer under different temperatures and the shock load are calculated, respectively. The research is beneficial to the design of spacecraft mechanism.     

农业综合开发水土保持项目工程分析

为了加快我国农业综合开发水土保持生态工程的建设步伐，构建人类自然的和谐，促进地方经济与流域治理的协调发展，为人们的生存与发展提供良好的生存环境，要求必须要加强农业综合开发与水土保持生态工程进行科学勘察与构绘，并且运用系统工程学原理、生态经济学原理，采取依靠科技、改善环境、强化管理、突出效益、减少泥沙，综合开发的工作方式，结合具体的社会经济条件、流域内自然条件，结合可当地国民经济发展战略和可持续发展战略，遵守经济规律和自然规律，将农业综合开发水土保持项目工程作为切入点，为实现全面建设小康社会提供重要的基础。