A two-stage stratified Warner’s randomized response model using optimal allocation

This paper applies Kim and Wardes (2004) stratified Warners randomized response model to Mangat and Singhs (1990) two-stage randomized response model. The proposed stratified randomized response model has an optimal allocation and a large gain in precision. Hence, the estimator based on the proposed method is more efficient than Kim and Wardes (2004) and Mangat and Singhs (1990) estimators under the conditions presented in both the case of completely truthful reporting and that of not completely truthful reporting by the respondents.     

传统大型企业研发项目管理模式分析

文章以一著名有色企业研发项目管理为例来分析传统大型企业研发项目管理模式,总结出研发项目管理模式的特点,即分散布局、意向指令与多头管理相结合。     

工程施工机械设备租买决策模型与准则

施工企业可以通过租赁或购买获取工程施工设备，采取何种方式应综合考虑各方案的经济合理性，风险大小，便捷和省时等，重点论述了工程施工机械设备租买决策的数学模型和相关决策准则，可供工程承包公司进行施工设备租买决策时参考。     

企业技术创新与研究开发探讨

在社会主义市场经济环境中，企业的技术创新和技术研发被提升到一个从未有过的高度，这两个词汇也频频被知识经济下的各种传媒所引用。作者认为，如果对二者没有一个清晰的概念，忽略了它们本质上的差异，那么对“科学技术是第一生产力”就不会有深刻的理解，也无法说清技术对经济的影响，思想的混乱将会导致企业决策和行动的失误。本文结合企业的实际情况，就技术研发与技术创新的表现以及对企业发展的作用和影响，进行分析和探讨。     

A sequential model for cracking down on street markets for illicit drugs

This paper develops a sequential decision-making model for assisting law enforcement officials in allocating resources during a crackdown operation on illicit drug markets. The sequential crackdown model (SCM) considers a probabilistic framework, where the probability of incarceration of a dealer and the probability of dealing are modeled as a function of the size of a drug market, crackdown enforcement level, drug dealer's financial hardship, and other market characteristics.The model was developed and tested in consultation with enforcement officials from Philadelphia, PA and Camden, NJ. We present a detailed, step-by-step implementation scheme for updating parameters on each day of the crackdown. Parameter estimation along with examples of model usage is provided. Through these examples, we illustrate how the SCM could be helpful in understanding the response of illicit drug markets to various enforcement strategies. We further show conditions under which an alternating crackdown policy (referred to as a crackdown-backoff) or a consistent use of maximum possible enforcement would be optimal strategies for managing a drug crackdown operation. Within the context of the model and parameter estimates, we show that a much quicker and less costly collapse could be implemented if the available enforcement resources are increased. Finally, the model provides possible conditions under which a crackdown operation would be unsuccessful in eliminating a drug market.     

一种产品生产规划模型

在对供应链中运输、库存、产品生产计划分析的 基础上,提出了一种解决厂家产品生产规划的混合整数规划 模型。     

长期筹资科学化的初步探索--构建最佳资本结构模型

助计算机用定量方法快速有效的解决长期筹资决策问题是知识经济时代对企业的必然要求。最佳资本结构模型用计算机运筹学的方法来决策不同筹资方式的最优筹资额，以帮助企业实现长期筹资目标同时也是财务管理最终目标——企业价值最大化。     

A note on the determination of A-optimal type block designs under fixed and mixed effects models

In this paper, we consider the problem of estimating a selected set of contrasts between v treatments using a block design consisting of b blocks of size k. Traditionally, the construction of A-optimal block designs for such situations has been carried out assuming a fixed effects model. In this paper, we show that A-optimal designs constructed under a fixed effects model are robust in the sense that these designs have maximal minimal efficiency when considered among all available designs and under all possible mixed effects models. AMS 1991 subject classifications: Primary 62K05; Secondary 62K10     

基于遗传算法的军用集装箱装载优化

以军用集装箱装载为研究对象，在考虑实际应用中的一些约束条件下，构造了军用物资的装载优化模型，提出了一种军用集装箱三维装载的遗传算法。该算法考虑了货物放置方向、装载客积、装载质量及装载重心等约束条件。最后对一个案例进行了计算，验证了该模型的有效性，并且利用3ds max得到了装载方案的三维图。