Approximation of the Bivariate Renewal Function

Recently, Kambo and his co-researchers (2012) proposed a method of approximation for evaluating the one-dimensional renewal function based on the first three moments. Their method is simple and elegant, which gives exact values for well-known distributions. In this article, we propose an analogous method for the evaluation of bivariate renewal function based on the first two moments of the variables and their joint moment. The proposed method yields exact results for certain widely used bivariate distributions like bivariate exponential distribution, bivariate Weibull distributions, and bivariate Pareto distributions. An illustrative example in the form of a two-dimensional warranty problem is considered and comparisons of our method are made with the results of other models.     

西方企业战略更新研究

企业战略更新是21世纪战略管理学的重要主题之一。阅读大量文献后,发现西方学者从不同的角度研究战略更新问题。美国学者佛罗达等是从中层管理者的角度出发,认为中层管理者是探索战略更新的一个合适的切入点。荷兰学者沃伯达等从共同演进的视角思考了战略更新,认为战略更新是一个持续的过程,应该把环境的选择和管理的适应性相结合。荷兰学者温勒梅科等是从整合的视角探索战略更新的轨迹,他们的研究视野融入了三个维度:组织形式、管理者角色和时间维度。     

经济转轨期农村经营模式:路径、绩效与创新

目前,我国农村实行的是以家庭承包经营为基础的双层经营体制。这种体制的弊端在于土地难以流转、经营规模太小、市场联系面窄、抵抗风险能力弱、农业资本投资不足、土地使用效率低等。要进一步发展农村经济,就必须创新经营模式,下一步应该把突破口放在以产权清晰为基础的统一经营上,建立农村家庭、涉农企业、集体和政府利益协同的产业链,把重点放在农产品的加工和流通环节,以企业为龙头,建立大市场大流通,实现规模经济效应。     

Elementary renewal theorems for widely dependent random variables with applications to precise large deviations

Abstract

On the basis of Wang and Cheng (J. Math. Anal. Appl. 384 (2011) 597–606), this paper further investigates elementary renewal theorems for counting processes generated by random walks with widely orthant dependent increments. The obtained results improve the corresponding ones of the above-mentioned paper mainly in the sense of weakening the moment conditions on the positive parts of the increments. Meanwhile, a revised version of strong law of large numbers for random walks with widely orthant dependent increments is established, which improves Theorem 1.4 of Wang and Cheng (2011 Wang, Y., and D. Cheng. 2011. Basic renewal theorems for a random walk with widely dependent increments and their applications. Journal of Mathematical Analysis and Applications 384 (2):597–606. doi:10.1016/j.jmaa.2011.06.010.[Crossref], [Web of Science ®] , [Google Scholar]) by enlarging the regions of dominating coefficients. Finally, by using the above results, some precise large deviation results for a nonstandard renewal risk model are established, in which the innovations are widely orthant dependent random variables with common heavy tails, and the inter-arrival times are also widely orthant dependent.     

城市更新背景下的文化旅游发展研究——以广州为例

文化旅游的兴起是当今旅游业发展的一大趋势。城市更新是城市发展的一种重要途径。随着文化消费时代的来临、文化经济的快速发展,文化旅游在城市更新发展中扮演着日益重要的角色。本文主要以广州为例,探讨了城市更新背景下文化旅游发展的意义、面临的问题和挑战以及进一步的思考。     

How publics react to situational and renewing organizational responses across crises: Examining SCCT and DOR in social-mediated crises

The prevalence of social media among networked publics calls for more research regarding how organizations can conduct effective crisis communication on social networking sites. Based on the situational crisis communication theory (SCCT) and the discourse of renewal (DOR) theory, this study examined how social media publics’ sentiments were affected by situational and renewing organizational responses in various clusters of crises. Twitter data of six crises representing three crisis clusters varying in the responsibility attribution (i.e., ambiguous, accidental, and preventable) were collected. We conducted a content analysis on organizations’ official tweets during crises (N = 59) and sentiment analysis on publics’ replies on Twitter (N = 4,340). The results showed that publics’ positive sentiments toward organizations were affected by organizational crisis responses that included instructing information, sympathy, systemic organizational learning, and effective organizational rhetoric. We recommend that crisis managers express sympathy toward publics as well as organizational learning that prevents a crisis from happening again.     

The covariance of the backward and forward recurrence times in a renewal process: the stationary case and asymptotics for the ordinary case

In a Poisson process, it is well-known that the forward and backward recurrence times at a given time point t are independent random variables. In a renewal process, although the joint distribution of these quantities is known (asymptotically), it seems that very few results regarding their covariance function exist. In the present paper, we study this covariance and, in particular, we state both necessary and sufficient conditions for it to be positive, zero or negative in terms of reliability classifications and the coefficient of variation of the underlying inter-renewal and the associated equilibrium distribution. Our results apply either for an ordinary renewal process in the steady state or for a stationary process.     

古村落保护整治规划中的有机更新——以休宁县石屋坑村保护整治规划为例

针对目前古村落保护整治利用中存在的机械单一保护古建筑的现象,引入"有机更新"的规划理念,以休宁县"百村千幢"工程——石屋坑村保护整治利用规划为例,从古村落的规划布局、总体形态、道路系统、建筑、村落环境等多方面进行有效更新,突出古村落的特点,盘活古村落,让其重新焕发生机和活力。规划针对古村落的现实状况,从管理机制、政策法规制订、资金筹措等方面提出具体有效的更新措施,以确保古村落保护整治利用规划的实施。并希望以此为案例,探讨适合古村落自身特点的保护对策和实施路径。     

Testing monotonic equilibrium residual entropy of N-State Random Evolution

In this study, we propose an information measure of uncertainty associated with the random equilibrium residual lifetime of a system driven by N-State Random Evolution. A U-statistic test driven by a moment inequality is proposed for testing the hypothesis that the uncertainty of equilibrium remaining life of a system remains unchanged (when system is in the steady state) against the alternative situation when system’s equilibrium residual life has increasing uncertainty over time (i.e., the life distribution has Increasing Equilibrium Residual Entropy property). Some numerical results such as tabulated critical values and empirical power of the proposed test statistic are presented as well.