On the concentration of the number of solutions of random satisfiability formulas

Let Z(F) be the number of solutions of a random k‐satisfiability formula F with n variables and clause density α. Assume that the probability that F is unsatisfiable is for some . We show that (possibly excluding a countable set of “exceptional” α's) the number of solutions concentrates, i.e., there exists a non‐random function such that, for any , we have with high probability. In particular, the assumption holds for all , which proves the above concentration claim in the whole satisfiability regime of random 2‐SAT. We also extend these results to a broad class of constraint satisfaction problems. © 2013 Wiley Periodicals, Inc. Random Struct. Alg., 45, 362–382, 2014     

Exact tail asymptotics for the Israeli queue with retrials and non-persistent customers

In this paper, we consider the Israeli queue which consists of a main queue with at most N groups and an infinite capacity retrial orbit. The retrial customers may become non-persistent before receiving service. This model was considered before and the decay rate function of the stationary distribution was obtained. To strengthen the result, we characterize the exact tail asymptotics by calculating the coefficient before the decay rate function.     

网络直播对餐饮O2O外卖顾客信任的影响研究

网络直播是基于互联网快速发展的一种实时视讯方式,其内容真实不可篡改,具有良好的实证作用。餐饮O2O外卖是以互联网为媒介,顾客线上下单,享受线下送餐上门的一种餐饮模式。但近几年外卖食品安全问题频发,导致顾客信任下降。基于网络直播的属性,本文构建了网络直播对餐饮O2O外卖顾客信任影响的结构方程模型。并通过问卷调查,进行了实证研究。研究结果表明网络直播的内容、主体、方式、时间、次数均对顾客信任具有显著性正向影响。最后根据研究结果提出了提高餐饮O2O外卖顾客信任及发展网络直播模式的建议。     

计及客户满意度的电动汽车物流配送路径规划与充放电管理

物流配送作为一种盈利型社会服务性行业,配送服务时间对客户满意度具有重要影响。论文考虑电动汽车(electric vehicle, EV)在配送途中和回到配送中心两个阶段,以物流配送成本最低和客户平均满意度最高为目标,构建了一种EV在换电模式下计及客户满意度的物流配送路径规划与充放电管理多目标优化模型,其中物流配送成本包括换电成本、车辆损耗成本以及慢速充放电成本。最后,以A-n29节点VRP基准测试系统插入四座换电站节点为例进行数值仿真,采用非支配排序遗传算法(Non-dominated sorting genetic algorithm, NSGA-II)对所提多目标优化模型进行求解,结果验证了所提方法的可行性和有效性。此外,论文进一步考查了EV慢速充放电管理对配电系统的影响,并对EV发车时间作了参数灵敏度分析,为管理者提供一些参考。     

社区教育社区成员满意度测评模糊模型

"办好人民满意的社区教育"正成为广大社区教育工作者办学理念和实践宗旨.指出社区教育社区成员满意度测评是社区教育发展和建设中不可或缺的重要一环.阐述社区教育社区成员满意度测评的理论依据.在构建社区教育社区成员满意度测评指标体系的基础上,提出社区成员满意率测评模糊模型,并设计计算机程序用于实际.举出实例得出某街道社区教育社区成员满意度为81.3的结论.     

结构方程模型评价体系的可比性问题

随着结构方程模型评价体系的推广应用,评价体系的可比性问题值得关注。本文以顾客满意度指数(CSI)为例说明结构方程模型评价体系的可比性问题,并通过模拟研究说明结构方程模型评价体系保持可比性的关键,那就是在其他条件一致的情况下,各结构方程模型中对核心变量的显变量设定一致,而各结构方程模型纳入何种潜变量以及如何设定潜变量之间关系,对评价体系可比性的影响并不显著。     

心理契约对目标绩效的影响研究:以工作满意为中介变量

构建了施工项目团队成员心理契约对目标绩效影响的结构模型,用交易型、关系型、管理型心理契约来衡量施工项目团队成员心理契约,用任务绩效、关系绩效来衡量目标绩效,把工作满意作为中介变量,运用结构方程模型的方法,分析结果表明:施工项目团队成员心理契约由交易型、关系型和管理型心理契约构成;工作满意对施工项目团队成员心理契约(交易型、关系型、管理型)满足程度与施工项目关系绩效的关系具有完全中介作用等结论。     

基于语言偏好信息的稳定双边匹配决策方法

针对语言偏好信息下的双边匹配问题,提出一种双边匹配决策方法。首先,将双边主体给出的语言偏好信息转化为三角模糊数;然后,基于去模糊化处理方法将三角模糊数转化为匹配满意度,在此基础上,考虑稳定匹配约束条件,以最大化每方主体的匹配满意度为目标,建立双边匹配多目标优化模型,求解模型,获得双边匹配结果;最后,通过一个算例验证了提出方法的可行性和有效性。     

基于时间和渠道敏感顾客选择偏好的双渠道定价策略

随着网络技术的发展,带动了网络销售模式的发展。网络渠道为顾客带来了便利性,也为制造商提供了扩大市场占有率和提高利润的机会,如何合理定价关系到企业的长久发展。在考虑顾客对网络渠道交付时间和网络渠道接受敏感的基础上,研究了制造商的单渠道和双渠道定价策略问题。研究结果表明,两种销售模式下零售渠道的定价相同,而网络渠道的定价低于零售渠道的定价。制造商可以通过引入网络渠道提高市场占有率、降低顾客时间敏感性和提高网络渠道接受程度,从而提高利润。最后,通过数值实验分析了交付时间敏感性和网络渠道接受程度对企业决策的影响,并对比分析了单渠道和双渠道的最优决策。     

Good and bad market research: A critical review of Net Promoter Score

Net Promoter Score, touted as the “single customer metric you need” and calculated from customers' answer to one simple question about their loyalty, has been in use since 2003 and adopted in a wide variety of settings. However, it has not lived up to its claimed benefits. This article evaluates the NPS approach in terms of its positive and negative results. This article is for people interested in NPS, still considering implementing NPS in their company, or interested in its technical underpinnings. It points out the benefits and shortcomings and explains why, and it describes what can be done to achieve the outcomes NPS theory claimed it would produce, but has not. The article is written in two parts for quite distinct audiences: firstly, for executives and managers who need customer data and information to make marketing decisions; and secondly, for market researchers, statisticians, and business analysts who are responsible for capturing and providing reliable, understandable, and meaningful customer data to the executives and managers who need the information. Consequently, the two sections are written in two different styles. The first section takes the form of a summary for managers and executives of our findings and recommendations in language aimed at business leaders; the second section provides a detailed analysis and critical review of NPS for market researchers, statisticians, and business analysts. Both sections present a better solution than NPS for understanding what customers value, delivering the best value to customers, winning market share, and creating truly loyal customers.