考虑施工次序与土质问题的土石方调运的网络模型研究

土石方施工在高速公路建设中数量巨大，传统的人工调配土石方方法既费时又无法得到最优调运方案．在现有的研究基础上提出考虑施工次序与土质问题的土石方调运研究的网络模型。     

基于Hopfield网络单元机组负荷多变量模型算法控制

电厂负荷系统是一个有耦合和约束的多变量对象。模型算法控制(MAC)是预测控制的一种，在惯性迟延对象的控制中有很好的应用。该文提出用Hopfield网络来求解具有约束的多变量负荷系统的控制输入。仿真表明，该方法算法简单、鲁棒性强、控制效果理想。     

BP算法求解多元线性回归模型初探

提出求解多元线性回归模型系数的BP算法，给出该算法的数学描述、推导过程和计算机编程步骤，并结合实例说明。     

供应链中二级分销网络优化设计的随机规划模型

给出供应链中二级分销网络优化设计的机会约束规划模型。模型中将各个分销中心的需求量和各工厂的生产能力设为随机参数，并进一步讨论如何将模型中的机会约束转化为确定性等价类问题。     

析《今日说法》的媒体品牌建构

在我国的法制类节目里,《今日说法》无论从受众的广泛性还是社会的影响力来说,无疑都是名列前茅的媒体品牌节目。笔者用品牌理论中的电通蜂窝模型理论来对《今日说法》进行品牌建构分析,以给其他媒体进行品牌建构一些启发。     

The minimal rank correlation,subject to order restrictions,with application to the weighted linear choice model

The weighted linear choice model is one of the most popular models in the social sciences. In this model the utility of a choice object is represented as a weighted sum of attribute-level desirabilities, where the weights are attribute importances. In many empirical contexts the choice objects are such that individuals are highly correlated in terms of their desirability ordering of levels within attribute (e.g., price levels, durability levels, etc.) but may differ appreciably in terms of their evaluations of each attribute's importance.In this paper we address the problem of how dissimilar two individuals may be, in a rank correlation sense, given that they agree completely on the desirability ordering of levels within attributes, but may disagree considerably regarding the importance they attach to the attributes themselves. The problem has interesting implications regarding the potential value of clustering individuals' utility functions for market segmentation or other such purposes.The authors would like to thank the editor and three anonymous reviewers for their excellent comments on an earlier draft of the paper.     

To combine or not to combine? issues of combining forecasts

This paper addresses issues such as: Does it always pay to combine individual forecasts of a variable? Should one combine an unbiased forecast with one that is heavily biased? Should one use optimal weights as suggested by Bates and Granger over twenty years ago? A simple model which accounts for the main features of individual forecasts is put forward. Bayesian analysis of the model using noninformative and informative prior probability densities is provided which extends and generalizes results obtained by Winkler (1981) and compared with non-Bayesian methods of combining forecasts relying explicitly on a statistical model for the individual forecasts. It is shown that in some instances it is sensible to use a simple average of individual forecasts instead of using Bates and Granger type weights. Finally, model uncertainty is considered and the issue of combining different models for individual forecasts is addressed.     

玻璃熔窑燃料的综合评价方法

<正> 平板玻璃工业是国民经济中重要的基础工业,在国民经济建设和城乡人民生活中起着十分重要的作用。大力发展玻璃工业,是现代化建设的需要,也是改善人民生活的需要。在平板玻璃的生产中,玻璃的熔制是在玻璃窑中接近1600℃的高温下进行的,要消耗大量的热量。这些热能占玻璃生产     

ODA多媒体文献模型及分析

本文介绍多媒体文献模型ＯＤＡ的逻辑结构和布局结构以及它们的关系，分析了ＯＤＡ模型的特点。