基于库存理论的铁路始发直达运输产品设计

将库存理论运用到铁路始发直达运输产品设计,能够有效实现运输服务组织成本与库存成本的有机统一。为实现库存成本在铁路始发直达运输中的加载,在考虑周期非完整情况下的库存成本的同时,将铁路运输和库存成本纳入同一目标函数,在装卸车地库存能力约束下,构建基于库存理论的铁路始发直达运输产品设计模型,确定成本最小的铁路始发直达运输产品设计方案。以赤峰地区至山东省煤炭运输网络为例,设计方案有效降低了成本,有助于吸引客户选择铁路运输,以及辅助铁路运营单位研究调整始发直达运输产品方案。     

Bankruptcy prediction for small- and medium-sized companies using severely imbalanced datasets

Bankruptcy prediction is still important topic receiving notable attention. Information about an imminent bankruptcy threat is a crucial aspect of the decision-making process of managers, financial institutions, and government agencies. In this paper, we utilize a newly acquired dataset comprising financial parameters derived from the annual reports of small- and medium-sized companies. The data, which reveal the true ratio between bankrupt and non-bankrupt companies, are severely imbalanced and only contain a small fraction of bankrupt companies. Our solution to overcome this challenging scenario of imbalanced learning was to adopt three one-class classification methods: a least-squares approach to anomaly detection, an isolation forest, and one-class support vector machines for comparison with conventional support vector machines. We provide a comprehensive analysis of the financial attributes and identify those that are most relevant to bankruptcy prediction. The highest prediction performance in terms of the geometric mean score is 91%. The results are validated on two datasets from the manufacturing and construction industries.     

基于快铁融合的上海铁路集装箱快运站选址研究

快铁融合可以充分发挥快递企业和铁路运输的优势,有效提升物流作业效率,达到运输资源分配平衡的效果,是多元化运输的发展方向。在既有和计划建设的铁路货运站中选择铁路集装箱快运站与快递企业集散网络衔接,以快递企业时间满意度和集散运输成本为目标,构建基于时间满意度的铁路集装箱快运站选址模型,以上海铁路集装箱快运站为例进行实证分析,提出保证铁路集装箱快运站与快递企业合理衔接的对策,为铁路集装箱运输融入快递市场提供决策支持,加速快铁融合的实施。     

Inequality and entrepreneurial thresholds

We explore the relationship between inequality and entrepreneurial activity. Drawing on cross-sectional data from a largescale survey of the economic conditions of individuals across India, we develop a number of dimensions of inequality to explore empirically how inequality interacts with entrepreneurship, operationalized as self-employment or as employing other people. We find compelling evidence that there are thresholds to becoming self-employed, and even more so to assembling the combinations of resources and personal attributes required to become an employer. Greater inequality leaves more people unable to make the transition to self-employment, leaving casual laboring as the occupation of necessity. At the same time, inequality increases the number of employers in a society, by concentrating resources - particularly land and finance - enough for significant numbers of people to be able to cross this higher threshold. Lastly, greater differentiation into social or religious groups curtails the ability to cross either entrepreneurial threshold, presumably by limiting the extent and benefits of social networks of value for entrepreneurship.     

X5CrNi18-10奥氏体不锈钢焊接工艺研究

X5CrNi18-10是一种奥氏体不锈热强钢,具有良好的使用性能和焊接性,但如果焊接参数选取不当或焊工操作不注意,很容易出现晶间腐蚀和热裂纹等缺陷。文章论述了取得良好X5CrNi18-10焊接接头的工艺及其原理。     

关于印度反倾销调查中“中国市场经济地位”

“非市场经济地位”是我国遭遇大量反倾销调查和反倾销败诉的主要原因。近年来，连发展中国家印度也频繁动用非市场经济地位武器对付中国。本文先分析了印度未给予我国市场经济地位待遇的情况及原因，论述了印度拒绝承认我国市场经济地位所带来的危害，并且从政府、企业和行业协会三个层面提出了如何争取印度承认我国市场经济地位的具体措施。     

新经济时代企业如何进行非资本扩张

非资本扩张是指企业通过除有形资本(如货币资本、实物资本)以外的要素投入来发展企业的行为。非资本要素包括技术、品牌、市场资源、管理能力和企业文化等无形资产。非资本扩张是与新的企业概念相适应的,是企业发展的高级阶段。与资本扩张相比,非资本扩张具有许多优越性。非资本扩张的主要途径有品牌扩张、特许经营和非资本型企业重组等。     

荔枝系列产品深加工技术

介绍了糖水荔枝罐头、荔枝汁、荔枝酒、速冻荔枝等产品的加工技术。     

期权模型在财产保险偿付能力研究中的应用

期权模型已广泛应用于金融保险业。本文将期权定价模型运用于财产保险的偿付能力分析。在保险被视为公司的负债且保险的需求函数与偿付能力不足风险成反比的假设下,可通过选择偿付能力不足风险的水平来实现保险人的利润最大化。     

对我国尽快制定《反垄断法》的理论思考

近些年来,反垄断问题已经成为我国法律界乃至全社会关注的一个焦点。当前国内市场上出现的大量为WTO所不容的垄断行为,已危及到了统一开放、竞争有序的社会主义市场经济体制的正常运行。因此,我国应尽快地制定出一部符合国际惯例及我国国情的《反垄断法》,从而规范国内市场,履行我国为加入WTO做出的相应承诺,提高我国的国际威望和地位。