A note on biasedness of tests of fit

The problem of testing a simple null hypothesis on multinomial distribution is considered. Biasedness of customarily used tests of fit is proved for unequal cell probabilities case.     

基于文本挖掘和自动分类的法院裁判决策支持系统设计

在许多大陆法系国家,不断产生的新型法律关系使得成文法无法及时制定和修改的缺陷逐渐显现。与此同时,世界各国纠纷诉讼的数目也在急剧增长,所以,很多国家面临如何在保证审判质量的前提下提高司法系统审判效率的问题。因此,在进行制度改革的同时,建立决策支持系统将会有效地辅助司法判决。本文以中国的医疗损害诉讼文本为例,使用文本挖掘和自动分类技术提出了一个法院裁判决策支持系统（CJ-DSS）,该系统可以依据以往判例预测新诉讼文本的判决结果：驳回与非驳回。结合案例,本文研究发现,组合特征提取法确实能够改进和提高分类器的分类性能,而且针对支持向量机（SVM）、人工神经网络（ANN）、K最近邻（KNN）三种不同的分类器,文档词频-卡方（DF-CHI）组合特征提取法对性能的改进程度有所差异,其中ANN的性能改进最高。除此之外,集成学习后该系统的分类性能更加稳定,显著优于单一分类器,F₁值达到93.3%。     

Sustainable food supply chains: the impact of automatic replenishment in grocery stores

The aim of this study is to empirically investigate the impact of automatic replenishment on food waste metrics in grocery stores. The work has been designed as a case study focusing on the replenishment process among various stores and a single warehouse. Food waste metrics of products ordered through an automatic replenishment program are compared against products ordered manually. Specifically we contrast food waste, remaining shelf life and availability at the stores for a variety of products with different shelf life. The study suggests that by utilising an automatic replenishment program the stores can reduce their level of food waste by up to 20% and their products have a longer remaining shelf life without compromising on-shelf availability. The study also indicates that the impact of the automatic replenishment program is dependent on the product’s shelf life. Those products with a shelf life of between 51 and 110 days experience the highest impact, while products with a shelf life below 30 days experience a low or even negative impact. The study extends the current understanding of automatic replenishment programs. The key point for practitioners is to apply appropriate replenishment programs according to the product characteristics and especially the shelf life.     

宝钢N2炼钢与焦化工程给水系统节能技术改造

讨论了宝钢Ｎ２炼钢煤气冷却高压给水流量调节系统的控制过程，通过自动回流阀组系统动态特性试验研究，并根据企业多英节能技术改造实践和现场长期运行使用情况，分析了自动回流阀组系统的开发应用前景及其社会经济效益。