Modeling cascade dynamics of railway networks under inclement weather

Understanding the cascade dynamics of delay propagation under inclement weather is crucial to proactive railway management. In this paper, we proposed a Switching Max-Plus System (SMPS) to model the delay propagation on railway networks, which extends the conventional MPS by incorporating multiple system matrices to capture the dynamic impacts of inclement weather. An algorithm based on the All-Paired Critical-Path (APCP) graph was developed to solve the SMPS, which calculates secondary delays without backtracking the precedent events. The proposed model and its solution algorithm were validated using discrete-time simulations on both artificial and empirical networks. The robustness of railway services was also analyzed using the concepts of vulnerability and diffusivity.     

区间时变时滞线性系统稳定性准则的改进

研究了区间时变时滞线性系统的稳定性问题,基于Lyapunov泛函方法,使用新的处理技术估计Lyapunov泛函导数的上界,以线性矩阵不等式形式给出了系统稳定性准则的改进结果。所给稳定性准则比已有结果具有更低的保守性,数值实例表明了结果的有效性。     

非金融企业委托贷款影响审计定价吗？

基于我国2011—2021年非金融类A股上市公司样本,实证考察了非金融企业委托贷款对审计定价的影响及其作用路径。研究发现,非金融企业委托贷款会显著提高审计定价,这种提升作用在股权关联型委托贷款、委托贷款业务复杂度高和处于货币政策紧缩期的企业中更显著。机制检验表明,经营风险和审计延迟是非金融企业委托贷款提高外部审计师审计定价的部分中介因子。研究从非金融企业委托贷款视角丰富了审计定价的相关理论研究。     

基于航空公司飞机滑行油耗均衡原则的机场停机位分配算法

机位是机场的重要资源,高效、合理的分配机位是机场运行的一个重要环节,也是机场地面作业的一个重要任务。本文建立了以各航空公司飞机滑行耗油均衡的目标机位分配策略,并采用遗传算法进行求解。数据结果证明了模型的和算法的有效性,表明该分配策略具有一定的理论价值和实际意义。     

一类有理型时滞差分方程的稳定性研究

在这篇文章中,我们研究如下形式的有理型时滞方程xn+1=(β4xn-4/A+B4xn-4)+Cxn-k-4,n=0,1,2,…的稳定性,得到了上述方程零解渐近稳定的充分条件,其中A,C,β4,B4是实常数,且A≠0,C≠0,k>1正整数。     

Economic Process Management and Its Application on Bank Industry

A renewal equation approach is proposed to derive the multiple special-cause cost model for a system with two dependent subprocesses. The economic individual X control chart and simple cause-selecting control chart are thus constructed to monitor the two subprocesses. They may be used to maintain the whole process with minimum cost and effectively distinguish which component of the subprocesses is out of control. The economic design parameters of these two control charts can be determined by minimizing the cost model using a simple grid search method. An example of its application on controlling service quality in the bank industry is given to illustrate the design procedure and its application. It shows that these control charts may be used to control not only manufacturing dependent subprocesses but also service organisations with dependent subprocesses.     

利用矢量网络分析仪测量时延特性的方法

解释了无线射频系统时延指标测量的意义及重要性,介绍了使用矢量网络分析仪进行时延指标测量的基本原理,归纳了网络分析仪进行线性器件、变频器件时延测量的测量方法,重点分析了变频器件时延测量的三种方法的原理、步骤和准确度.     

基于后效晚点时间的机场机位容量评估研究

针对机场机位各种时间要素进行分析,以航班后效晚点时间作为机场机位服务质量的限定标准,并以此标准来确定平均必要缓冲时间,进而结合机型混合比、航班时段百分比等概念建立机场机位容量最优化模型。并以国内某大型机场作为实证分析,其结果具有一定的理论价值和实际意义。     

The role of externalities and information aggregation in market collapse

We examine the role that belief, network externality, and information aggregation play in inefficient market collapses. After receiving consecutive negative shocks, some ex-ante identical Bayesian agents will be discouraged about the unknown state of the market they invest; therefore, they will stop investing. This decision will have two effects: first, it will cause agents to aggregate information through social/observational learning; second, it will decrease the network externality effect. We show that there might be an inefficient market collapse if the externality effect diminishes too much, and the cost of re-entry to the market is too high. We also analyze the effects of strategic delay and experimentation on the exit decision of the agents. I especially thank Thomas D. Jeitschko, Matthew Mitchell, B. Ravikumar Ted Temzelides. I also thank anonymous referees, an associate editor, John Conlon, Larry Samuelson, Troy Tassier, Stephen Williamson, and seminar participants of the University of Saskatchewan, Georgia Tech, Concordia University, University of Manitoba, Iowa Alumni Workshop, Midwest Economic Theory Conferences held at Indiana Bloomington, and Notre Dame, and 1st International Conference on Business, Management and Economics organized by Yasar University.     

Toward a sustainable conceptualization of dependent variables in entrepreneurship research

Entrepreneurship researchers have yet to explore the full range variance that occurs in entrepreneurial value creation because we have focused almost exclusively on financial performance as the dependent variable in our research. However, such arbitrary narrowness is not supported by research, which shows entrepreneurs to not focus exclusively on income maximization. Consistent with calls for an expanded view of the consequences of entrepreneurship, we develop a typology of entrepreneurship dependent variables that supports broadening the scope of entrepreneurship research to include economic, environmental and social value. Copyright © 2006 John Wiley & Sons, Ltd and ERP Environment.