Economic interpretations of DEA

Research on productive efficiency at the firm level has developed as an important and active strand of research the last decades, both within operations research, management science and economics. Two apparently different definitions of efficiency are examined, but it is shown that when both estimation methods are based on solving linear programming problems the definitions of efficiency are identical. The purpose of the paper is to give the basic ideas of efficiency analyses using DEA as a tool for researchers not so familiar with efficiency analysis and DEA. The concept of shadow prices is given special attention.     

物流线性规划问题的MATLAB求解

对线性规划问题的图解法、单纯形解法,以及MATLAB的函数linprog求解方法进行了对比分析,并结合实例,采用linprog函数对产销平衡和产销不平衡的两类物流运输问题进行了求解。     

“由面到点”的教学方法在农林高校VB课程教学中的运用

本文提出了在农林高校程序设计课程中引入"由面到点"的教学方法,结合农林类高校实际情况,针对VisualBasic程序设计课程的具体教学,详细讨论了该教学方法的运用,实践证明,这种教学方法的使用取得了非常好的教学效果。     

数控车床加工实训中的故障分析

本文通过分析学生在数控车床实训时易产生的故障和操作失误,阐述了故障发生的原因、避免或排除的对策,以切实提高学生的数控加工能力。     

Non-permutation flowshop scheduling in a supply chain with sequence-dependent setup times

In this paper, we consider a flowshop scheduling problem with sequence-dependent setup times and a bicriteria objective to minimize the work-in-process inventory for the producer and to maximize the customers' service level. The use of a bicriteria objective is motivated by the fact that successful companies in today's environment not only try to minimize their own cost but also try to fulfill their customers' need. Two main approaches, permutation and non-permutation schedules, are considered in finding the optimal schedule for a flowshop. In permutation schedules the sequence of jobs remains the same on all machines whereas in non-permutation schedule, jobs can have different sequence on different machines. A linear mathematical model for solving the non-permutation flowshop is developed to comply with all of the operational constraints commonly encountered in the industry, including dynamic machine availabilities, dynamic job releases, and the possibility of jobs skipping one or more machines, should their operational requirements deem that it was necessary. As the model is shown to be NP-hard, a metasearch heuristic, employing a newly developed concept known as the Tabu search with embedded progressive perturbation (TSEPP) is developed to solve, in particular, industry-size problems efficiently. The effectiveness and efficiency of the search algorithm are assessed by comparing the search algorithmic solutions with that of the optimal solutions obtained from CPLEX in solvable small problem instances.     

电机生产计划计算机优化系统

本文介绍了电机生产计划计算机优化系统.该系统主要由模型优化和数据处理两大部分组成,采用结构化方法进行系统分析与设计.该系统解决了合理、充分地利用有限原材料的问题,为工厂制订更合理、更科学的生产计划提供了必要的信息。     

.NET远程处理构架及分布式对象处理

Microsoft○R.NET远程处理为在不同的应用域(AppDomains)、不同的进程和不同计算机中活动的对象的交互提供了系统框架支持,使其相互之间能够进行畅通无阻的通信。分布式对象处理(Remoting)依托 NET远程处理框架运行库及编程模型的支持,使得分布式对象处理变得异常简捷透明。本文探索了可利用的 NET远程处理方案,并详细探讨了分布式对象的处理实例。     

行为导向教学法在空气调节技术课程教学中的运用

文章初步探讨了在中等职业学校制冷与空调专业空气调节技术课程中运用行为导向教学法的必要性、可行性,并结合实例阐述了行为导向教学法实施过程及在教学中应注意的问题.