Power laws and fragility in flow networks

What makes economic and ecological networks so unlike other highly skewed networks in their tendency toward turbulence and collapse? Here, we explore the consequences of a defining feature of these networks: their nodes are tied together by flow. We show that flow networks tend to the power law degree distribution (PLDD) due to a self-reinforcing process involving position within the global network structure, and thus present the first random graph model for PLDDs that does not depend on a rich-get-richer function of nodal degree. We also show that in contrast to non-flow networks, PLDD flow networks are dramatically more vulnerable to catastrophic failure than non-PLDD flow networks, a finding with potential explanatory power in our age of resource- and financial-interdependence and turbulence.     

对现行劳务派遣用工制度的考察

我国的劳务派遣用工自产生以来,其利弊得失、是非曲直一直颇具争议。而《劳动合同法》生效后不久所呈现的劳务派遣用工"井喷"现象再度提醒理论与实务界应给予高度重视。为避免劳动法构筑的"千里和谐劳动关系长堤"毁于劳务派遣"乱象"之蚁穴,我国应借鉴国外对劳务派遣谨慎而从严限制的经验做法,完善我国的劳务派遣用工制度。     

资金流量表模型体系的建立与应用

本文在资金流量核算表的基础上,依据“固定产品收入结构假定”、“固定产品支出结构假定”、“固定部门收入结构假定”、“固定部门支出结构假定”四种假定,给出了编制资金流量部门表和资金流量产品表的计算公式,建立了包含4个机构部门模型、2个金融产品模型、4个部门与产品交叉模型的资金流量表乘数模型体系。用中国2011年资金流量表数据进行了实际验证。利用这些模型可以进行部门间、产品间、部门与产品相互之间的资金流量关系分析,可以为制定政策、追踪各种资金关联效应提供方法论的支持。     

Finding nucleolus of flow game

We study the algorithmic issues of finding the nucleolus of a flow game. The flow game is a cooperative game defined on a network D=(V,E;ω). The player set is E and the value of a coalition S⊆E is defined as the value of a maximum flow from source to sink in the subnetwork induced by S. We show that the nucleolus of the flow game defined on a simple network (ω(e)=1 for each e∈E) can be computed in polynomial time by a linear program duality approach, settling a twenty-three years old conjecture by Kalai and Zemel. In contrast, we prove that both the computation and the recognition of the nucleolus are -hard for flow games with general capacity. Supported by NCET, NSFC (10771200), a CERG grant (CityU 1136/04E) of Hong Kong RGC, an SRG grant (7001838) of City University of Hong Kong.     

Matrix‐Exponential Distributions: Calculus and Interpretations via Flows

By considering randomly stopped deterministic flow models, we develop an intuitively appealing way to generate probability distributions with rational Laplace–Stieltjes transforms on [0,∞). That approach includes and generalizes the formalism of PH-distributions. That generalization results in the class of matrix-exponential probability distributions. To illustrate the novel way of thinking that is required to use these in stochastic models, we retrace the derivations of some results from matrix-exponential renewal theory and prove a new extension of a result from risk theory. Essentially the flow models allows for keeping track of the dynamics of a mechanism that generates matrix-exponential distributions in a similar way to the probabilistic arguments used for phase-type distributions involving transition rates. We also sketch a generalization of the Markovian arrival process (MAP) to the setting of matrix-exponential distribution. That process is known as the Rational arrival process (RAP).     

模糊交货期Flow Shop调度文化进化算法研究

基于文化算法及文化进化思想设计了的文化进化算法,通过上层文化空间的经验知识指导下层个体进化搜索的方向及步长,通过模拟人类社会文化进化的机制实现文化空间的进化与更新,最后将算法应用到模糊Flow Shop问题的求解,用Matlab编程仿真测试.结果表明,此算法解决生产调度优化问题是可行的,而且其搜索性能优于简单遗传算法及模拟退火算法.     

基于心流体验视角的在线消费者购买行为影响因素研究

在线消费者处于虚拟的网络环境中,具有其独特的需求和行为特征,而"心流体验"理论在解释影响在线消费者行为的情感和认知因素方面有重要意义.本文将从"心流体验"视角探索影响在线消费者购物行为的因素.本文研究表明,网站设计维度、表现维度、消费者自身维度和网站内容维度都会显著影响在线消费者心流体验,从而导致消费者增加无计划的购买数量以及增强重复购买的意愿.     

自由现金流量假说检验:审计收费视角

本研究在控制相关变量下,采用非金融上市公司面板数据,应用混合回归和固定效应回归实证检验自由现金流量和审计收费之间的关系,从审计收费角度检验自由现金流量假说。本研究提供的经验数据表明,自由现金流量和审计收费显著正相关,验证了自由现金流量假说。     

Multi-objective permutation flow shop scheduling problem: Literature review,classification and current trends

The flow shop scheduling problem is finding a sequence given n jobs with same order at m machines according to certain performance measure(s). The job can be processed on at most one machine; meanwhile one machine can process at most one job. The most common objective for this problem is makespan. However, many real-world scheduling problems are multi-objective by nature. Over the years there have been several approaches used to deal with the multi-objective flow shop scheduling problems (MOFSP). Hence, in this study, we provide a brief literature review of the contributions to MOFSP and identify areas of opportunity for future research.     

Flow management and its impacts on operational performance

Based on the organisational capability perspective and the concept of flow management, this study examines the inter-relationships between the management of five flows (human, information, decision, logistics and production flows) and their effects on operational performance. The research model was empirically tested using data from 321 Australian companies. The results show that human flow management (HFM) has a positive effect on the management of the other four flows. Further, information flow management (IFM) is positively associated with logistics flow management (LFM), whereas decision flow management (DFM) is positively associated with both production flow management (PFM) and LFM. The results also show that HFM, PFM and LFM can improve operational performance directly, whereas IFM and DFM only enhance operational performance indirectly. Our findings contribute to flow management theories and practices.