重庆港与南京港基于信息共享的物流联动模式研究

基于协同管理的港口群运营协同机制,分析了重庆港和南京港的信息建设基础与发展方向,为进一步实现重庆港与南京港的功能联动、信息共享提供基础。构架重庆港与南京港物流信息共享模式的功能与系统平台,提出了基于港口联动的信息共享新模式。     

临港产业区VMI Hub运作模式与供应链协同研究

VMI Hub具备物料集配功能,是临港产业区大型制造企业实现JIT生产与供应商管理库存的可行方案。针对临港产业区的特定环境,根据物料集配方式的不同将VMI Hub的运作总结为直达和混合两种模式。并以联想VMI Hub为例,分析了VMI Hub实施的前提条件、运作流程以及对制造商、供应商和第三方物流等供应链各方的影响。     

以西安市为例看我国郊区城市化

郊区城市化就是人口、就业岗位和服务业从大城市中心区向郊区迁移的一种离心扩散过程,它是城市化发展的必经阶段。本文以西安为例,从自然、社会经济等方面进行分析,提出了西安在郊区化过程中出现的问题,有针对性的提出了对策。     

舞蹈的动与静

《乐记》有云:诗,言其志也;歌,咏其声也;舞,动其容也。自古也就有黎民社稷,以舞见兴衰的说法,可见舞蹈与人们的生活是息息相关的。古人在劳动中创造舞蹈,在舞蹈中美化劳动。从某个意义上讲,舞蹈发展史也就是人类的发展史。     

Learning‐by‐Exporting Revisited: The Role of Intensity and Persistence*

Two non‐mutually exclusive hypotheses can explain the empirically established export premium: self‐selection of more productive firms into export markets and learning‐by‐exporting. This paper focuses on how the temporal dimension of firms' exporting activities and the intensity of exports influence the scope of learning effects. Using a panel of Swedish firms and dynamic generalized method of moments estimation, we find a learning effect among persistent exporters with high export intensity, but not among temporary exporters or persistent exporters with low export intensity. For small firms, exports boost productivity among persistent exporters with both high and low export intensity, but the effect is stronger for persistent export‐intensive small firms.     

并联混合动力汽车性能仿真分析

文章建立了并联混合动力汽车的动力性能数学模型,并在MATLAB平台下开发了并联混合动力汽车动力性能仿真软件系统。基于此软件,对某并联混合动力汽车的动力性能进行了仿真,并将其与试验结果进行了对比,证明了模型的有效性。最后,依据仿真结果,分析了影响并联混合动力汽车动力性能的各项参数,并据此提出了改进其性能参数以提高其动力性能的方法。     

动态网络下多源多汇应急疏散问题算法

提出了一个时间依赖容量约束的动态网络下多源多汇的人群应急疏散问题,基于分组疏散的思想和TAG时间依赖网络的最短路算法,设计了一个启发式求解算法。算法将多源多汇问题转化为单源单汇问题,对各源点的待疏散人群采取分组疏散,并为每组人群找到一条满足时变容量约束的最早到达时间的路径及时刻表。最后进行了方法的应用分析。该算法能适用于大规模时变网络的人群应急疏散。     

Technological Centers as a Negotiated Context to Combine Technological Capabilities

Recent perspectives on a capabilities view of the firm often recognize the need for firms to develop an external organization. From a relational view of the industry, the external organization may include economic and non-economic exchange relationships. The decision to combine both types of relationships and its relevance for the firm can be linked to their role for accessing, generating and diffusing knowledge. More often than not, these decisions are however not unilateral. This paper discusses the potential role that Technological Centers (TC’s), created by the collective initiative of some local firms, can play as part of firms’ external organizations and emphasizes TC’s role in connecting economic and non-economic exchange relationships. It is further suggested that the diverse motives and benefits perceived by firms in relating in and across the TC’s and, in general, the relevance of sharing experiences within these contexts, should be seen in the wider context of firms’ specific and idiosyncratic trajectories.     

Determinants of violent and property crimes in England and Wales: a panel data analysis

We examine various determinants of property and violent crimes by using police force area level (PFA) data on England and Wales over the period of 1992–2008. Our list of potential determinants includes two law enforcement variables namely crime-specific detection rate and prison population, and various socio-economic variables such as unemployment rate, real earnings, proportion of young people and the Gini Coefficient. By adopting a fixed effect dynamic GMM estimation methodology we attempt to address the potential bias that arises from the presence of time-invariant unobserved characteristics of a PFA and the endogeneity of several regressors. There is a significant positive effect of own-lagged crime rate. The own-lagged effect is stronger for property crime, on an average, than violent crime. We find that, on an average, higher detection rate and prison population leads to lower property and violent crimes. This is robust to various specifications. However, socio-economic variables with the exception of real earnings play a limited role in explaining different crime types.     

基于上下游企业不对称信息博弈的供应链应急协调

以供应系统的突发事件为研究对象,确定制造商作为供应链中的核心企业,引进紧急系数的概念,实现突发事件下对供应品的分类管理,在此基础上以制造商获得供应商告知实情、防止劣质产品供应以及期望收益的最大化为准则,对供需双方冲突进行博弈分析,给出期望收益的趋势图,并从时间、收益等多个维度刻画突发事件可能造成的危害和可挽救度,建立不同等级供应品的供应系统动态应急模型,分多阶段对突发事件进行动态协调,得到不同等级供应品的应急预案流程,促进突发事件的快速恢复,最后选取实际案例,对模型的可行性进行验证。