适于大规模网络的应急车辆配置模型

应急车辆的配置是在规划阶段优化事件响应策略的重要方面,以往建立的应急车辆配置模型大都难以用于大规模的网络计算。在假设需求服从正态分布的条件下,以最小化平均反应时间为目标函数,建立了线性整数规划模型,给出了算法和算例,为公共安全设施的规划提供了一种简单可靠的方法。     

Performance estimation of a wind farm with a dependence structure between electricity price and wind speed

This paper aimed to estimate the income generated by a wind turbine over a given time interval. The income depends on two main variables: the wind speed that determines the produced energy and electricity price. Both wind speed and electricity price evolve randomly in time and are correlated. To consider this dependency, we applied a vector autoregressive process (VAR) that links both variables. An application was performed using real data from a hypothetical wind turbine located in Sardinia (Italy). The income simulated by using the VAR model was closer to the empirical value compared with that obtained by simulating wind speed and electricity prices as independent variables. The results were also discussed in relation to the introduction of the SAPEI submarine cable, which produces a significant change in the income value.     

试对供应链管理一体化营销运作技术的研究

21世纪的竞争是供应链之间的竞争,从属于供应链的营销活动和物流活动的整合将实现顾客价值和整条链价值的最大化本文从供应链管理一体化的基础上探究营销运作新技术策略。     

MULTIPLICATIVE APPROXIMATION OF WEALTH PROCESSES INVOLVING NO‐SHORT‐SALES STRATEGIES VIA SIMPLE TRADING

A financial market model with general semimartingale asset–price processes and where agents can only trade using no‐short‐sales strategies is considered. We show that wealth processes using continuous trading can be approximated very closely by wealth processes using simple combinations of buy‐and‐hold trading. This approximation is based on controlling the proportions of wealth invested in the assets. As an application, the utility maximization problem is considered and it is shown that optimal expected utilities and wealth processes resulting from continuous trading can be approximated arbitrarily well by the use of simple combinations of buy‐and‐hold strategies.     

An Integral Model of Collective Action in Organizations and Beyond

While a large amount of work has been done to understand public good and to construct conceptual models explaining the antecedents of collective action, current literature is flawed in that most of them only examine the lower-level public good and attribute people's participation in collective action to external variables. It pays little to the developmental nature of collective action. Utilizing Ken Wilber's theory of integral psychology, this paper proposes a holistic definition of public good, emphasizing its different levels of development. The paper also introduces an integral model of collective action that explains the antecedents of collective action in terms of not only the external individual behavior and social factors but also the internal aspects of individuals, organization, and society. Lu Tang is a doctoral candidate at the Annenberg School for Communication, University of Southern califorina, USA.     

Finite-maturity stock loans under the constant elasticity of variance model

This article expresses the constant elasticity of variance stock loans pricing formula in terms of the noncentral chi-square distribution. By using the numerical solutions of the integral equation for the early exit boundary, we calculated the valuation of the stock loans. Numerical analysis is carried out to establish explicitly the value of such a loan, as well as the loan amount and the fee for providing such a service.     

基于模糊积分的物流中心规划

物流中心合理的选址能够减少货物运输费用,从而大大降低运营成本。对不确定环境下的选址进行了研究,指出物流系统分析与设计过程中涉及的各个因素不一定是相互独立的。在物流系统分析与设计中引入模糊积分作为一种综合评价方法,并用实例说明了该方法的有效性。     

整体壁板参数化设计与敏感性分析

对整体壁板的止裂特性和损伤容限性能进行了计算和分析．应用参数化有限元技术,得到该结构的蒙皮裂纹尖端应力强度因子,分析了凸台和筋条对结构止裂特性的影响;随后根据线弹性断裂力学理论,计算了结构的剩余强度,并分析了凸台和筋条的存在对结构剩余强度的影响．为了分析结构几何参数对该结构的敏感性,给出了不同结构参数下的应力强度因子曲线,和其相对应的结构剩余强度曲线．这些曲线对整体壁板的结构设计提供了有意义的参考．     

Kernel density estimation for time series data

A time-varying probability density function, or the corresponding cumulative distribution function, may be estimated nonparametrically by using a kernel and weighting the observations using schemes derived from time series modelling. The parameters, including the bandwidth, may be estimated by maximum likelihood or cross-validation. Diagnostic checks may be carried out directly on residuals given by the predictive cumulative distribution function. Since tracking the distribution is only viable if it changes relatively slowly, the technique may need to be combined with a filter for scale and/or location. The methods are applied to data on the NASDAQ index and the Hong Kong and Korean stock market indices.     

含参变量反常积分交换定理的一个补充证明

针对当前数学分析里含参变量反常积分交换定理证明中存在的一些遗留问题，利用反常积分的有关性质，函数序列的Dini定理，对该定理的证明加以完善、补充。