Polyhedral Combinatorics in Combinatorial Optimization

Polyhedral combinatorics is a subarea of combinatorial optimization of increasing practical importance. It deals with the application of the theory of linear systems and linear algebra to combinatorial problems. The paper is not intended as a survey on polyhedral combinatorics but it reviews some of the main concepts and proof techniques.     

Remaining life estimation of used components in consumer products: Life cycle data analysis by Weibull and artificial neural networks

Environmental awareness and legislative pressures have made manufacturers responsible for the take-back and end-of-life treatment of their products. To competitively exploit these products, one option is to incorporate used components in “new” or remanufactured products. However, this option is partly limited by a firm's ability to assess the reliability of used components. A comprehensive two-step approach is proposed. The first stage phase statistically analyzes the behavior of components for reuse. A well-known reliability assessment method, the Weibull analysis, is applied to the time-to-failure data to assess the mean life of components. In the second phase, the degradation and condition monitoring data are analyzed by developing an artificial neural network (ANN) model. The advantages of this approach over traditional approaches employing multiple regression analysis are highlighted with empirical data from a consumer product. Finally, the Weibull analysis and the ANN model are then integrated to assess the remaining useful life of components for reuse. This is a critical advance in sustainable management of supply chains since it allows for a better understanding of not only service requirements of product, but the remaining life in a product and hence its suitability for reuse or remanufacture. Future work should assess: (1) reduction in downtime of process equipment through the implementation of this technique as a means to better manage preventative maintenance; (2) reduce field failure of remanufactured product; (3) selling-service strategy through implementation of the proposed methodology.     

基于企业生命周期的财务控制体系设计

财务控制是企业财务管理的核心环节,控制的核心是控制体系的设计。企业在不同的发展阶段应采取不同的财务控制制度。文中将企业生命周期纳入财务控制体系设计中,从企业生命周期的新视角构建企业的财务控制体系,以期为我国处于不同生命周期的企业在构造财务控制体系时提供借鉴。     

Bayesian life test planning for the Weibull distribution with given shape parameter

This paper describes Bayesian methods for life test planning with Type II censored data from a Weibull distribution, when the Weibull shape parameter is given. We use conjugate prior distributions and criteria based on estimating a quantile of interest of the lifetime distribution. One criterion is based on a precision factor for a credibility interval for a distribution quantile and the other is based on the length of the credibility interval. We provide simple closed form expressions for the relationship between the needed number of failures and the precision criteria. Examples are used to illustrate the results.Received: October 2002 / Revised: March 2004     

延长桂林旅游地生命周期的对策

针对桂林旅游地生命周期的主要影响因素提出了加强环境保护，提高旅游产品质量、优化旅游产品结构、完善旅游产品种类，加强旅游宣传促销，加强区域合作等一系列对策，以期能延长桂林旅游地生命周期，使桂林旅游业得到持续稳定发展。     

德日刑法中的遗弃犯罪及对我国刑法的启示——从一则案例谈起

我国刑法中的遗弃罪之本质在于对公民在家庭中受扶养权利的侵犯，行为人和被害人必须是同一家庭的成员。对于司法实践中发生的非家庭成员之间的严重遗弃行为因无明文规定而无法予以惩治，刑法法益保护之机能也就因此不能实现。有必要借鉴德日刑法相关立法，以完善我国刑法中关于遗弃罪的规定。     

发展中的旅游人类学

20世纪70年代，旅游成为当代人生活的一个重要组成部分，同时带来各种社会文化的碰撞和变迁。这一问题引起了人类学家的注意，他们就旅游者及其类别，旅游的目的、动机和方式，旅游给东道国带来的文化影响和社会问题等论题进行研究，广泛吸收其他学科的基本理论，形成了人类学独特的基础理论，并在此基础上形成了人类学的一个分支学科－旅游人类学。     

中国乡镇企业产出增长来源实证分析

本文简要介绍了中国乡镇企业的发展概况和影响其发展的主要因素 ,以实际总产值作为产出指标 ,对乡镇企业产出增长与全要素生产率增长率、资本投入、劳动投入和规模损益之间的联系进行了详细的实证分析 ,分别考察了技术进步 (全要素生产率增长率 )、资本投入、劳动投入和规模损益对乡镇企业产出增长的绝对拉动作用和相对贡献份额 ,并分别考察了乡镇企业产出增长的波动程度、乡镇企业的资本生产率、劳动生产率及有机资本构成情况。在此基础上 ,提出了保证乡镇企业健康、稳定、持续增长的若干政策建议     

模块化研究综述

有关模块化的研究越来越多,本文对国内外的研究进行了综述。主体部分按模块化产品的生命周期研究,模块化产品、模块化组织与系统整合的研究两条线索,围绕运作管理、产品开发以及组织管理等方面评述模块化的主要研究成果。提出几个待于进一步研究的问题。     

加入WTO后对我国产品质量管理的新思考

我国加入 WTO后对产品质量管理应有一个新的认识新的思考 ,本文研究了质量管理环境的变化 ,分析了世界质量管理的发展趋势 ,提出了质量管理内涵的扩展。鉴于质量管理已成为新世纪产品战略的制高点 ,针对质量管理的新认识提出质量管理保证体系的思考。