Optimal control of an M/G/1 queue with impatient priority customers

An optimal operating policy is characterized for the infinite‐horizon average‐cost case of a single server queueing control problem. The server may be turned on at arrival epochs or off at departure epochs. Two classes of customers, each of them arriving according to an independent Poisson processes, are considered. An arriving 1‐customer enters the system if the server is turned on upon his arrival, or if the server is on and idle. In the former case, the 1‐customer is selected for service ahead of those customers waiting in the system; otherwise he leaves the system immediately. 2‐Customers remain in the system until they complete their service requirements. Under a linear cost structure, this paper shows that a stationary optimal policy exists such that either (1) leaves the server on at all times, or (2) turns the server off when the system is empty. In the latter case, we show that the stationary optimal policy is a threshold strategy, this feature being commonplace in most of priority queueing systems and inventory models. However, the optimal policy in our model is determined by two thresholds instead of one. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 201–209, 2001     

生态建筑研究

传统的城市环境理念主要是针对城市在发展过程中的污染问题,即解决城市“三废”造成的环境问题。本文以自然生态原则为依据,从生态学的角度研究建筑设计的准则、设计的道德基础和技术经济的合理性,探讨人、建筑、自然三位和谐一体,构建可持续的人类居住环境.     

论消防部队基本建设跟踪审计过程控制

针对基本建设审计特点,提出逐步从规范基本建设审核审批程序入手,进行基建建设前期、施工中及结算、决算跟踪审计,发挥审计监督的机制性作用,达到基本建设活动全过程运作规范、有序、监督有效。     

省部共建高校的服务定位：打造区域经济社会发展的核心动力源

省部共建高校是我国高等教育的重要组成部分,其服务应立足区域经济建设和社会发展的需要,一方面推进区域自主创新,另一方面实现学校自身又好又快的发展。该文从人才培养、科技创新、社会服务、文化辐射四方面分析了省部共建高校的服务定位,提出力争将其建设成为推动区域经济社会发展的核心动力源,成为地方高校发展的示范集群。     

加强新疆高校学位点建设工作的思考

学位点建设是一项系统工程,学位点的多少和层次可以体现一所学校学科建设和师资队伍建设的水平。本文通过与西部重点高校学位点建设现状的比较,分析了新疆高校学位点建设中存在的问题,提出了加强学位点建设的措施。     

Dynamic inventory management with cash flow constraints

In this article, we consider a classic dynamic inventory control problem of a self‐financing retailer who periodically replenishes its stock from a supplier and sells it to the market. The replenishment decisions of the retailer are constrained by cash flow, which is updated periodically following purchasing and sales in each period. Excess demand in each period is lost when insufficient inventory is in stock. The retailer's objective is to maximize its expected terminal wealth at the end of the planning horizon. We characterize the optimal inventory control policy and present a simple algorithm for computing the optimal policies for each period. Conditions are identified under which the optimal control policies are identical across periods. We also present comparative statics results on the optimal control policy. © 2008 Wiley Periodicals, Inc. Naval Research Logistics 2008     

警卫部队基层建设研究

部队建设的基础在基层,基层建设是警卫部队建设与发展的重要内容,也是警卫事业全面发展的重要保证。在新世纪新阶段,只有以科学发展观为指导,把科学发展观贯穿于警卫部队基层建设的全过程,落实到各项具体工作中,才能使部队建设在安全、有序的环境下得以全面、持续、和谐、健康地发展,才能真正提升部队战斗力,履行好警卫部队肩负的历史使命。     

基于组成要素的作战体系构建方法研究

针对当前作战体系构建理论研究中的若干问题,提出了基于组成要素的作战体系构建方法,对作战体系进行了模块分解和功能要求分析,得出了基于组成要素构建一般作战体系的框架图,可为同类作战体系构建提供参考。     

消防办公网络安全需求分析及对策

通过简要介绍消防网络的构成及功能,进行网络安全及需求分析,并结合消防办公信息网的实际恃况,提出制定安全对策的几种建议.     

军队院校大学英语课程建设与改革初探

通过对国内大学英语教学改革和课程体系建设相关文献的综述,结合多年来的一线教学经验,客观地反思了军队院校大学英语教学中普遍存在的一些问题,有针对性地探讨了21世纪军队院校大学英语教学改革的总体目标,并对大学英语课程体系的完善提出了一些建设性的措施和设想;还结合新的教学大纲对四级后教学和课程体系建设提出了一些新的见解.