Coordinated dynamic control of marketing and production

We study the dynamic profit maximization problem for a firm exercising control on both marketing and production. The firs marketing effort impacts the current‐period demand, which in turn affects future demand in a dissipating fashion. Under linear‐cost and zero‐leadtime assumptions, we show that the firm should follow base‐point rules for both marketing and production, whereas trends of the base points reflect a certain complementarity between marketing and production. We obtain comparable results when marketing costs are convex. Our computational study identifies conditions under which simple fixed‐marketing‐effort and fixed‐marketing‐target heuristics would perform well. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009     

Approximation algorithms for general one‐warehouse multi‐retailer systems

Logistical planning problems are complicated in practice because planners have to deal with the challenges of demand planning and supply replenishment, while taking into account the issues of (i) inventory perishability and storage charges, (ii) management of backlog and/or lost sales, and (iii) cost saving opportunities due to economies of scale in order replenishment and transportation. It is therefore not surprising that many logistical planning problems are computationally difficult, and finding a good solution to these problems necessitates the development of many ad hoc algorithmic procedures to address various features of the planning problems. In this article, we identify simple conditions and structural properties associated with these logistical planning problems in which the warehouse is managed as a cross‐docking facility. Despite the nonlinear cost structures in the problems, we show that a solution that is within ε‐optimality can be obtained by solving a related piece‐wise linear concave cost multi‐commodity network flow problem. An immediate consequence of this result is that certain classes of logistical planning problems can be approximated by a factor of (1 + ε) in polynomial time. This significantly improves upon the results found in literature for these classes of problems. We also show that the piece‐wise linear concave cost network flow problem can be approximated to within a logarithmic factor via a large scale linear programming relaxation. We use polymatroidal constraints to capture the piece‐wise concavity feature of the cost functions. This gives rise to a unified and generic LP‐based approach for a large class of complicated logistical planning problems. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009     

美军车辆防护发展演变及启示

本文通过对HMMWV车型的装甲防护发展演变和美军装甲防护战略的分析,得出其对我军车辆防护发展的启示作用。     

“三个代表”重要思想与社会主义文化建设

党的十六大报告把发展社会主义文化,建设社会主义精神文明,确定为全面建设小康社会的一个重要目标,体现了我们党对文化建设的高度重视。要深刻认识文化建设的战略意义。牢牢把握先进文化的前进方向,用“三个代表”重要思想统领社会主义文化建设。     

HPGe多道γ谱仪测量煤灰的放射性

运用HPGe(高纯锗)多道γ谱仪对煤灰样品进行了放射性测量和核素分析,并与参考文献中的相关数据作了比较,讨论了燃煤对工作人员及公众的影响.结论:处理和利用此种煤灰必须慎重.     

认识"两个必然"必须解决的几个基本问题

本文坚持唯物辩证法的观点,分析了当代资本主义的"变"与"不变"、当代社会主义的"败"与"不败",以及资本主义与社会主义在全球化过程中的若干联系问题,对在新的历史条件下理解马克思主义"两个必然"理论的科学性与真理性,以及江泽民提出的"四个如何认识"问题有启示意义.     

电流变液的光学特性及其应用研究

电流变液是一种极具发展前景的新型智能材料．文中介绍了目前国内外电流变液的光学特性研究动态,分析了其机理,并展望了应用前景．力求能准确反映电流变液光学特性研究的发展现状,旨在促进电流变液在光学领域的研究．     

抢抓机遇积极探索努力推进依法治火进程

党的十五大提出了“依法治国,建设社会主义法制国家”的基本方略。坚持依法治久,积极推进消防法制建设,是实行依法治国方略的重要内容,也是发展消防事业的必由之路。文章对贵州消防法制建设的经验进行了系统的总结,提出了跨世纪消防法制建设的基本框架。     

D-S证据论在空中目标分类中的应用

首先叙述识别、分类空中目标时需使用多传感器融合技术,分析可利用的各类传感器和从其可得到的各种目标属性参数,以及各种数据融合方法.然后详细介绍了基于D-S证据论的3种多源信息融合分类空中目标方法,并对具体仿真应用结果作了比较.     

从明清侠义小说中侠义英雄的创作看人性善恶二重性——以《绿牡丹全传》为例

人性善恶问题,一个千古争论的哲学命题。本文将以文学作为视角,分别从作品中英雄人物形象、作者文学创作动机两个方面,对这一问题作出较新的阐释。从而得出结论：在人的本质属性中,善与恶是对立统一的。但人类总可以避恶扬善,以谋求自身的存在和发展。