Detecting embedded pure network structures in LP problems

Recently, linear programming problems with special structures have assumed growing importance in mathematical programming. It is well known that exploiting network structures within linear programs can lead to considerable improvement of the computational solution of large-scale linear programming problems. A linear program is said to contain an embedded network structure provided that some subset of its constraints can be interpreted as specifying conservation of flow. If a column of the constraint matrix has at most two non-zeros, then it leads to embedded generalized network structure and if these non-zeros are unit elements and of opposite signs, then it leads to embedded pure network structure. In this paper, we are concerned with algorithms for detecting embedded pure network structures within linear programs. The network extraction methods are presented in two groups. The first group covers deletion and addition based algorithms and the second group covers GUB based algorithms. We have extended the GUB based algorithm appearing in the second group by introducing Markowitz merit count approach for exploiting matrix non zeros. A set of well known test problems has been used to carry out computational experiments which show that our extensions to the GUB based algorithms give better results than the algorithms reported earlier.     

Schopenhauer's Prolegomenon to Fuzziness

Prolegomenon means something said in advance of something else. In this study, we posit that part of the work by Arthur Schopenhauer (1788–1860) can be thought of as a prolegomenon to the existing concept of fuzziness. His epistemic framework offers a comprehensive and surprisingly modern framework to study individual decision making and suggests a bridgeway from the Kantian program into the concept of fuzziness, which may have had its second prolegomenon in the work by Frege, Russell, Wittgenstein, Peirce and Black. In this context, Zadeh's seminal contribution can be regarded as the logical consequence of the Kant-Schopenhauer representation framework.     

高校图书馆“学科馆员”的角色定位

阐述了现代信息社会高校图书馆建立“学科馆员”制度的必然性,从学历水平、能力水平等方面探讨了“学科馆员”的角色定位与工作职责定位。     

论二十一世纪森林经理学科建设

简要回顾了森林经理学科的发展历程,认为基础理论不全不稳、认识机械、方法简单是传统森林经理存在的主要问题.对学科建设提出了如下观点可持续发展是未来森林经理学科建设的指导思想;整体性原则、多元发展原则、社会性原则是森林经理应遵循的原则;哲学理论、可持续发展理论、市场经济理论、组织森林经营的理论是森林经理的理论基础;适应社会需要,具备完备的基础理论、技术科学、工程技术,对森林资源实现有效的管理是学科建设的目标;"3S"技术、系统方法、网络化、模拟仿真方法是森林经理的基本方法;进行学科定位、森林可持续经营标准与指标的确定、经营管理模式的探索、人才的培养是学科建设急需解决的问题.     

社会中介组织法律地位探析

公共行政理论的发展，使社会中介组织成为与国家行政一同行使公共管理职能的社会公行政的承担者，其作为国家和社会、个人之间的中介，承担了越来越多的原应由政府部门履行的公共服务职能，同时，它代表其组织成员的利益，加强与政府的沟通、交流与互动，并在相当程度上制约政府权力，具有特殊的法律地位。这种特殊的法律地位不仅体现在其独立性上，更可以从其地位的双重性上凸现出来。     

海藻糖对渗透胁迫下油菜种子萌发和幼苗生长的影响

25％PEG-6000渗透胁迫显著抑制油菜种子萌发和幼苗生长．使种子萌发推迟，发芽率降低22.67％，发芽指数降低112．8％，活力指数降低10．4倍，单株鲜质量、地上与地下部分鲜质量、地上和地下部分长度分别降低4．2，4．0g，4．82，4．19和1.42倍；25mmol／1。海藻糖（TH）处理能显著促进渗透胁迫下油菜种子萌发和幼苗生长．使种子发芽率提高14．67％，发芽指数提高33．12％，活力指数提高175．40％，单株鲜质量提高101．69％，地上、地下部分鲜质量和地上、地下部分长度分别提高62．38％，335．29％，25％和11．11％．     

简论我国判例法制度的构建

判例在我国历史上曾经长期作为法律的重要渊源,并且我国在立法和司法实践中已在一定范围、一定程度上借鉴和实施了判例法制度,因而在我国构建以成文法为主、判例法为辅的有限判例法制度具有现实可行性。我国有限判例法制度的构建应该包括判例的效力、判例的创制主体、创制程序、判例的变更和废止、司法裁判文书的改革等内容。     

学科馆员制度与高校图书馆的读者服务

论述了高校图书馆建立学科馆员制度的必要性与重要性,分析了学科馆员的工作职责,提出了学科馆员激励机制和绩效考评的具体措施。     

在版编目中文献主题标引常见错误分析

针对在版编目中文献主题标引存在的常见问题,从多方面进行了原因分析,并提出了有效的应对策略。     

信息时代学币斗馆员的素质和知识结构

阐述了学科馆员所必须具备的素质和知识结构,以满足高校图书馆服务教学科研的要求。