基于VMI的中低压配网物资协议库存采购模式研究

协议库存采购是国家电网公司为提高中低压配电工程物资供应的时效性对配网的部分物资实行协议库存采购货物招标的一种新的采购模式。为提高供应商的准时供货率,保障物资供应,在供应商管理库存（VMI）的基础上,将电网企业的物资采购与库存方式相结合,提出了VMI协议库存采购模式及具体的实施方式。     

Demand for Redistribution: Individuals’ Responses to Economic Setbacks

Economic circumstances have been argued to be a major determining factor of attitudes toward redistribution, but there is little well‐established evidence at the individual level. The Swedish National Election Studies are constructed as a rotating survey panel, which makes it possible to estimate the causal effect of economic changes. The empirical analysis shows that individuals who lose their job become considerably more supportive of redistribution. Yet, attitudes toward redistribution return to their initial level as economic prospects improve, suggesting that the effect is only temporary. While a job loss also changes attitudes toward the political parties, the probability of voting for the left‐wing is not affected.     

三线铁路荷载作用下箱梁桥荷载横向分布系数

文章运用有限元程序对三线铁路预应力混凝土连续箱梁桥进行了模拟,分析了三线铁路荷载作用下箱梁的受力特性及在各种荷载工况下荷载横向分布规律,给出了荷载横向系数的实用值。     

城市流通系统:研究现状与一个综合性框架

现代流通产业的发展演变过程是伴随着现代城市的产生与发展过程进行的,现代城市是现代流通产业的载体,而城市则因为流通产业的发展而发展、壮大.因而,流通问题与城市问题是密不可分的.目前城市流通问题的研究集中在商业地理学领域,而传统流通理论则游离于该领域之外,这种游离造成了该领域研究的一些问题.本文在比较全面地回顾和评述了国内外学者对城市流通问题研究现状的基础上提出了一个综合性的研究框架,以期为城市流通问题的研究提供新的视角.     

基于禁忌搜索的物流配送中心选址方法研究

物流配送中心选址问题在物流网络规划中占有非常重要的地位,选址的合理与否直接关系到配送中心未来的发展。针对企业选址的一般要求,以配送中心总成本最小为目标,构造了一种物流配送中心选址模型。该模型较接近现实情况,同时,给出了求解该模型的禁忌搜索算法和简单算例。     

新零售下社区生鲜配送模式的综合评价

新零售模式下社区生鲜“最后500m”的冲刺已成为生鲜农产品快速配送的关键问题。基于目前已有的配送模式:“社区+便利店”模式、第三方配送以及众包模式,通过层次分析法从服务水平、配送成本、客户体验三个方面对三种配送模式进行量化分析,得出每种配送模式在各层次的权重。研究结果表明配送中降低配送成本是关键,减少货物赔损率、提高客户满意度才能实现有效率的配送。     

Simulating the Evolution of the Implied Distribution

Motivated by the implied stochastic volatility literature (Britten–Jones and Neuberger, forthcoming; Derman and Kani, 1997; Ledoit and Santa–Clara, 1998) this paper proposes a new and general method for constructing smile–consistent stochastic volatility models. The method is developed by recognising that option pricing and hedging can be accomplished via the simulation of the implied risk neutral distribution. We devise an algorithm for the simulation of the implied distribution, when the first two moments change over time. The algorithm can be implemented easily, and it is based on an economic interpretation of the concept of mixture of distributions. It can also be generalised to cases where more complicated forms for the mixture are assumed.     

浅谈航道港口的泥沙淤泥问题处理

航道就是在湖泊、港湾等水域里为船舶提供安全的航行通道。而港口则是为船舶的停靠和安全进出提供的有利条件。如果航道和港口出现了泥沙淤积的问题,那么就必须要解决它。但要如何解决呢?这就是我们要研究的问题。     

Poverty Traps, Indeterminacy, and the Wealth Distribution

We consider a one-sector growth model in continuous time with a production externality and endogenous labor supply. There is a continuum of households who have identical preferences but differ with respect to their initial wealth. We show that there exist economies such that an indeterminate steady state exists for some wealth distribution but not for others. A second result is that a redistribution of wealth may drive the economy from a steady state with strictly positive output to a poverty trap in which output converges asymptotically to zero. These results indicate that differences in the wealth distribution may be responsible for drastic differences in the long-run standard of living. Journal of Economic Literature Classification Numbers: D31, D50, O41.     

基于GIS的配送车辆调度系统的设计与实现

本文分析了物流配送与GIS的特点和功能，简要介绍了我们所设计开发的基于CIS的配送车辆调度系统。