基于分布式工厂的供应链二级分销网络生产计划优化模型

从供应链的集成和协作角度出发,提出了在多工厂、多分销商条件下二级分销网络生产计划制定的双层规划模型,模型考虑了二级网络中制造商和分销商之间的信息共享,从而降低了整个链上的费用。同时设计了启发式求解算法,并给出了一个数值例子。     

Improved Bounds on Relaxations of a Parallel Machine Scheduling Problem

We consider the problem of scheduling n jobs withrelease dates on m identical parallel machines to minimize the average completion time of the jobs. We prove that the ratio of the average completion time of the optimal nonpreemptive schedule to that of the optimal preemptive schedule is at most 7/3, improving a bound of Shmoys and Wein.     

多目标动态规划问题的非劣矩阵解法

针对多目标动态规划问题,指出其一般只存在非劣解的性质,提出了多目标阶段收益非劣矩阵、多目标阶段收益非劣合成矩阵和多目标逆向递推矩阵等概念。在此基础上构造出一种新的多目标动态规划解法—非劣矩阵法,该方法不需要事先给出各目标的相应权重,并能保证得到多目标动态规划问题的所有非劣解。文中给出的计算实例验证了这一方法的正确性和实用价值。     

大型0—1目标规划的启发式算法

提出了一个０－１线性目标规划新的启发式算法,该算法以新的算法准则及评价标准,改进了旧算法中的系数限制,并能通用于任何０－１线性目标规划问题,特别能够有效地解决大规模０－１线性目标规划问题。     

Agricultural education: Gender identity and knowledge exchange

Women farmers are underserved in agricultural education and technical assistance. Long held social constructions of farming women as ‘farmwives’ and in some cases ‘the bookkeepers’ rather than farmers or decision-makers influence the direction of most educational programming delivered through extension programs in land-grant universities in the United States. Consequently, many women farmers generally view these spaces as hostile, rather than helpful environments. This paper uses the agricultural training framework developed by Liepins and Schick (1998) to analyze our research on developing educational programming for women farmers. We conducted five focus groups with members of the Pennsylvania Women's Agricultural Network (PA-WAgN) to better understand women farmers’ needs for education. Women farmers reported the kinds of knowledge and information they want, in what kinds of contexts, and through what means of communication. We adapt and extend the original theoretical framework developed by Liepins and Schick to incorporate the seriality of women's identities, their discourses of embodiment and the agency granted to them through social networks. Through a presentation of the results of these focus groups, we discuss both the relevance of gender to agricultural education and the importance of the network model in providing education to women farmers.     

Optimal sample coordination using controlled selection

Sample coordination maximizes or minimizes the overlap of two or more samples selected from overlapping populations. It can be applied to designs with simultaneous or sequential selection of samples. We propose a method for sample coordination in the former case. We consider the case where units are to be selected with maximum overlap using two designs with given unit inclusion probabilities. The degree of coordination is measured by the expected sample overlap, which is bounded above by a theoretical bound, called the absolute upper bound, and which depends on the unit inclusion probabilities. If the expected overlap equals the absolute upper bound, the sample coordination is maximal. Most of the methods given in the literature consider fixed marginal sampling designs, but in many cases, the absolute upper bound is not achieved. We propose to construct optimal sampling designs for given unit inclusion probabilities in order to realize maximal coordination. Our method is based on some theoretical conditions on joint selection probability of two samples and on the controlled selection method with linear programming implementation. The method can also be applied to minimize the sample overlap.     

党的领导集体科学解读马克思主义的理论特色

马克思主义中国化的历史过程在某种程度上就是党的领导集体科学解读马克思主义的历史过程。党的领导集体科学解读马克思主义的历史过程中内蕴着主体性、实践性、时代性、科学性和价值性等理论特色;彰显着个体主体与社会主体、解读实践与社会实践、历时性与共时性、合规律性与合目的性以及社会主义与现代化的有机统一。     

滥用敬称·误读旧称·不识简称──《围城(节选)》中的三处"硬伤"及其编校责任

孙昕光主编的《大学语文》是高等教育出版社出版的"国家级规划教材",其"阅读部分"节选了钱锺书的小说《围城》。由于出版社的编辑和校对工作不到位,课文中至少存在着三处文本"硬伤":其一,原著滥用敬称,说"汪处厚"是"汪次长的令伯",编选者听之任之,以讹传讹;其二,编选者误读旧称,偷换概念,改原著中的"论理学"为"伦理学";其三,编选者不识简称,擅自扩大外延,改原著中的"比国女人"为"外国女人"。由此看来,"规划教材"的编写者、审订者和出版者们还没有真正担负起自己的职业责任。     

非线性规划一般约束条件的SQP方法

提出了一种新的处理等式和不等式约束条件优化问题的SQP方法，计算过程中每一步迭代只需解一个二次规划。在一定条件下，证明了算法的全局和二步超线性收敛性，其优点是具有较小的计算量，避免了Maratos现象的发生。     

组合投资最优化模型

本文通过对投资资产的经济意义分析,建立了组合投资的多目标规划模型,引入单位风险收益率求解此模型.最后,用此模型求解一竞赛赛题.