The advent of rapid prototyping & manufacturing techniques represents a major breakthrough in production engineering. This paper is concerned with the software system aspects of the selective laser sintering (SL...The advent of rapid prototyping & manufacturing techniques represents a major breakthrough in production engineering. This paper is concerned with the software system aspects of the selective laser sintering (SLS),i.e.the issues that deal with an external geometric CAD model to automatically control the physical layering fabrication process as directly as possible ,regardless of the source of the model. The general issues are described and some key methods are given in this paper.展开更多
以糯扎渡—鹤山±800 kV特高压直流输电系统为研究对象,利用电力系统计算机辅助设计和电磁暂态模拟程序软件(power system computer aided design and electric magnetic transient in DC system,PSCAD/EMTDC),建立交流系统、换流...以糯扎渡—鹤山±800 kV特高压直流输电系统为研究对象,利用电力系统计算机辅助设计和电磁暂态模拟程序软件(power system computer aided design and electric magnetic transient in DC system,PSCAD/EMTDC),建立交流系统、换流器、换流变压器、交直流滤波器、直流平波电抗器、直流输电线路的仿真模型,并在这个仿真平台上进行单极、双极全压仿真模拟分析,仿真结果表明所建模型较准确地模拟糯扎渡—鹤山特高压直流输电系统,可以作为研究特高压直流输电系统的有效工具。展开更多
Analytic Hierarchy Process (AHP) method can be used to solve the tasks of multi-criterion decision system fields, but some complicated questions processed by AHP cannot be easily solved by means of the general method....Analytic Hierarchy Process (AHP) method can be used to solve the tasks of multi-criterion decision system fields, but some complicated questions processed by AHP cannot be easily solved by means of the general method. It is because of being unsatisfied with consistency condition or judgment matrix too intricate to solve, which causes AHP invalidation. So in order to resolve this problem, AHP knowledge systems reduced with the aid of Genetic Algorithms (GA) were proposed, which directly acquired the order of AHP issue through the rule of Rough Sets Theory (RST) method, or solved the tasks reduced by RST with classical AHP method. On this condition, the compare decision system of region informatization level was solved, and the results solved were the same to those by classical AHP, which denoted that this method was more simple and reliable, besides the four rules of changing AHP system into RST Decision System.展开更多
文摘The advent of rapid prototyping & manufacturing techniques represents a major breakthrough in production engineering. This paper is concerned with the software system aspects of the selective laser sintering (SLS),i.e.the issues that deal with an external geometric CAD model to automatically control the physical layering fabrication process as directly as possible ,regardless of the source of the model. The general issues are described and some key methods are given in this paper.
文摘以糯扎渡—鹤山±800 kV特高压直流输电系统为研究对象,利用电力系统计算机辅助设计和电磁暂态模拟程序软件(power system computer aided design and electric magnetic transient in DC system,PSCAD/EMTDC),建立交流系统、换流器、换流变压器、交直流滤波器、直流平波电抗器、直流输电线路的仿真模型,并在这个仿真平台上进行单极、双极全压仿真模拟分析,仿真结果表明所建模型较准确地模拟糯扎渡—鹤山特高压直流输电系统,可以作为研究特高压直流输电系统的有效工具。
基金Sponsored by the National Natural Science Foundation of China(Grant No70472075)the Project of the Jiangxi Province Natural Science Foundation(Grant No2007GZS0898)the Project of Science and Technology for the Department of Education of Jiangxi Province (Grant No2007-183)
文摘Analytic Hierarchy Process (AHP) method can be used to solve the tasks of multi-criterion decision system fields, but some complicated questions processed by AHP cannot be easily solved by means of the general method. It is because of being unsatisfied with consistency condition or judgment matrix too intricate to solve, which causes AHP invalidation. So in order to resolve this problem, AHP knowledge systems reduced with the aid of Genetic Algorithms (GA) were proposed, which directly acquired the order of AHP issue through the rule of Rough Sets Theory (RST) method, or solved the tasks reduced by RST with classical AHP method. On this condition, the compare decision system of region informatization level was solved, and the results solved were the same to those by classical AHP, which denoted that this method was more simple and reliable, besides the four rules of changing AHP system into RST Decision System.
