随机需求下横向并购供应链网络整合优化策略研究

本文从系统优化视角,针对增设集散中心的横向并购供应链网络整合策略,利用变分不等式建立了随机需求下的整合优化模型。以市场链为主线,以供应链网络均衡理论为基 础,构建了以横向并购供应链网络活动总成本最小为目标的数学模型,通过转换成变分不等式采用改进的欧拉算法进行模型求解。通过数值算例进一步说明了模型的适用性和灵活性,得出了增设集散中心的并购整合策略能够降低供应链网络的平均运营成本的结论,通过对比不同市场紧密程度下产生的供应链网络平均成本协同效应,发现随着市场紧密程度的增加其协同效应更明显,为横向并购供应链网络整合优化提供理论依据与方法。     

用于牛粪固液分离的变导程螺杆挤压脱水机的结构设计

通过对变导程螺杆挤压脱水机在畜牧养殖农场的实验表明,本文设计和制造的变导程螺杆挤压脱水机能够对牛粪进行合适的分离,而且分离出的牛粪干燥物干燥度合适,分离出的液体中的固体悬浮物少。因此,本文对用于牛粪固液分离的变导程螺杆挤压脱水机的总体设计的研究有一定的实用价值。     

需求预测模型的应用研究

需求预测是供应链管理中重要的环节,可帮助企业提高客户满意度。文中通过对需求预测模型的研究,阐述了定量预测法的适用范围,结合历史销售数据和预测模型模拟验证,为企业选择适合的预测模型提供方法。     

污水生化处理技术在涠洲终端的应用研究

中海油湛江分公司涠洲终端处理厂与桂林工学院合作研究,采用"厌氧+好氧+过滤"组合工艺对终端厂含油污水进行处理。从根本上解决了终端厂旧有污水处理设施处理量不足的问题,使终端厂污水排放指标达到了国家和当地环保部门的要求,取得了很好的经济和环保效益。     

基于随机需求的物流配送中心选址离散模型研究

针对物流需求不确定情况下的物流配送中心选址问题,对传统模型进行改进,将随机需求变量引入离散型选址模型,利用随机规划理论和遗传算法对实例模型进行求解。结果显示物流需求不确定情况下的随机规划模型的求解结果比假设已知需求情况下的结果真实可信,所需物流费用较少。     

Calibration Estimation in Survey Sampling

Calibration estimation, where the sampling weights are adjusted to make certain estimators match known population totals, is commonly used in survey sampling. The generalized regression estimator is an example of a calibration estimator. Given the functional form of the calibration adjustment term, we establish the asymptotic equivalence between the functional-form calibration estimator and an instrumental variable calibration estimator where the instrumental variable is directly determined from the functional form in the calibration equation. Variance estimation based on linearization is discussed and applied to some recently proposed calibration estimators. The results are extended to the estimator that is a solution to the calibrated estimating equation. Results from a limited simulation study are presented.     

试论物流企业信息化建设

本文从物流信息系统的需求分析入手，分析了物流企业信息化建设过程中的几个关键问题，从物流适作流程分析与设计两方面阐述了物流企业的信息化建设之路。     

Dynamic advertising and pricing with constant demand elasticities

In this paper we analyze a stochastic dynamic advertising and pricing model with isoelastic demand. The state space is discrete, time is continuous and the planing horizon is allowed to be finite or infinite. A dynamic version of the Dorfman–Steiner identity will be derived. Explicit expressions of the optimal advertising and pricing policies, of the value function and of the optimal advertising expenditures will be given. The general results will be used to analyze the case of impatient customers. Furthermore, particular time inhomogeneous models and homogeneous ones with and without discounting will be examined. We will study the social efficiency of a monopolist's optimal policies and the consequences of specific subsidies. From a buyer's perspective, our analysis reveals that waiting – when looking at (immediate) expected prices – is never profitable should two or more units be available. But we will also prove that the sequence of average sales prices is monotone decreasing. Moreover, the techniques applied to solve the discrete stochastic advertising and pricing problem will be used to solve a related deterministic control problem with continuous state space.     

灌片节水配套改造工程的必要性和可行性研究

文章以4个灌片为例,探讨了灌片节水配套改造工程的必要性和可行性。通过对项目区渠系水利用系数极低、实灌面积严重缩减以及水资源供需平衡进行分析,得出灌片节水配套改造工程的必要性;通过对典型工程的实际设计,得出灌片节水配套改造工程的可行性。     

可变截面涡轮增压器蜗壳流场分析

目前涡轮增压器是车用内燃机中的增压器,可变截面涡轮增压器是涡轮增压器,其流场也会伴随蜗壳形状、叶轮、旁通阀等变化而发生变化,本文对于这些可能存在的状况进行了模拟分析,在实验中得出数据,从而推出结论。