双权值最短路径问题的一种解决算法

物流配送方案中,费用、时间是客户最关心的两个问题。物流企业需要基于这两个客户所关心的问题,提出一套低成本的物流配送方案。本文探求使用费用、时间双权值有向图最短路径问题,解决这种配送方案,并进行算法的时间复杂度分析。     

D-S证据理论中冲突证据的合成方法

针对高度冲突证据的合成问题,分析了D-S合成方法及其改进方法的不足,提出了一种新的改进方法。新方法仍利用D-S合成公式,但针对该公式要求参与合成的各证据需具有相同重要程度的要求,考虑到融合系统中各证据的重要程度可能不同,直接利用公式合成可能得到与实际相悖的结论,因而引入证据权的概念,给出了证据权的具体算法,通过证据权对已有的基本可信度分配函数进行修正得到了重要性相同的新的证据的基本可信度分配模型。最后通过算例比较表明新方法的合成结果更为理想。     

当代音系理论管窥

20世纪60年代,生成音系学诞生,开始了音系研究的崭新阶段。70年代以后,非线性音系理论提出,使得音系研究更为立体。80年代以来,各种观点和流派异彩纷呈,蔚为大观。当代音系理论的出现,极大地推动了语音系统的研究,丰富了语言理论的探索。     

平淡出奇巧简明蕴繁复--鲁迅《风波》重量人名巧用

鲁迅<风波>中七斤一家的重量人名是其小说中常用的数字人名之一种.作者结合秤的度量标准的变化和人的生理规律,经过仔细推算确定、使用的重量人名,在表面的民俗现象之下,暗示出辛亥革命时期社会经济凋敝,民众饱受通货膨胀之苦的生存现实.这与小说反映的民众的精神意识相辅相成,完整勾勒了辛亥革命时期的社会风貌,从而在经济状况这一层面表达了鲁迅对社会变革的深重忧虑.     

A bayesian test for a two-way contingency table using independence priors

One method of testing for independence in a two-way table is based on the Bayes factor, the ratio of the likelihoods under the independence hypothesis H and the alternative hypothesis H. The main difficulty in this approach is the specification of prior distributions on the composite hypotheses H and H. A new Bayesian test statistic is constructed by using a prior distribution on H that is concentrated about the “independence surface” H. Approximations are proposed which simplify the computation of the test statistic. The values of the Bayes factor are compared with values of statistics proposed by Gunel and Dickey (1974), Good and Crook (1987), and Spiegelhalter and Smith (1982) for a number of two-way tables. This investigation suggests a strong relationship between the new statistic and the p-value.     

陕西青年对构建和谐社会认识的调研

本文以陕西青年对构建和谐社会的调研为依据，分析当前陕西青年的思想现状，为进一步正确教育和引导青年积极参与社会主义和谐社会建设提供了可供借鉴的依据，并就共青团组织在构建和谐社会中如何充分发挥青年的作用进行了思考和探索。     

Employment, family union and childbearing decisions in Great Britain

Summary.  The paper investigates the life-cycle relationship of work and family life in Britain based on the British Household Panel Survey. Using hazard regression techniques we estimate a five-equation model, which includes birth events, union formation, union dissolution, employment and non-employment events. We find that transitions in and out of employment for men are relatively independent of other transitions. In contrast, there are strong links between employment of females, having children and union formation. By undertaking a detailed microsimulations analysis, we show that different levels of labour force participation by females do not necessarily lead to large changes in fertility events. Changes in union formation and fertility events, in contrast, have larger effects on employment.     

Evaluating Weight of Evidence in the Mystery of Balkan Endemic Nephropathy

Balkan endemic nephropathy (BEN) is a chronic, progressive wasting disease of the kidneys, endemic in certain rural regions of the Balkan nations Croatia, Serbia, Bulgaria, and Romania. It is irreversible and ultimately fatal. Though this disease was first described in the 1950s, its causes have been a mystery and a source of much academic and clinical contention. Possible etiologic agents that have been explored include exposure to metals and metalloids, viruses and bacteria, and the dietary toxins aristolochic acid (AA) and ochratoxin A (OTA). AA is a toxin produced by weeds of the genus Aristolochia, common in Balkan wheat fields. Aristolochia seeds may intermingle with harvested grains and thus inadvertently enter human diets. OTA is a mycotoxin (fungal toxin) common in many foods, including cereal grains. In this study, we analyzed the weight of evidence for each of the suspected causes of BEN using the Bradford Hill criteria (BHC): nine conditions that determine weight of evidence for a causal relationship between an agent and a disease. Each agent postulated to cause BEN was evaluated using the nine criteria, and for each criterion was given a rating based on the strength of the association between exposure to the substance and BEN. From the overall available scientific evidence for each of these suspected risk factors, AA is the agent with the greatest weight of evidence in causing BEN. We describe other methods for testing causality from epidemiological studies, which support this conclusion of AA causing BEN.     

关于带权Hardy不等式

本文得到了Hardy算子Tf(x)=integral from o to x f(t)dt从空间L~p(R_+,vdx)到L~q(R_+,Udx)有界的权函数对(u,v)的特征,其中1≤q相似文献