未确知有理数的定义运算及其应用

本文给出未确知有理数的定义、运算。并把它应用到煤矿立井建设中,为矿井施工管理提供了可靠的数学处理方法。     

基于未确知测度理论的大型水利枢纽工程施工环境保护评价

为促进大型水利枢纽工程绿色可持续发展,根据大型水利枢纽工程施工环境特点,结合相关技术导则,构建施工环境评价指标体系,基于未确知测度理论构建大型水利枢纽工程施工环境保护评价模型,以献县枢纽为例,进行实证分析。结果表明,实证结果与实际情况相符,说明该模型具有适用性。研究结果对促进大型水利枢纽工程可持续发展具有重要意义。     

基于未确知测度的综合管廊施工安全评价研究

系统考虑管廊本体、人员、环境及管理等影响施工安全因素,基于综合管廊施工安全指标体系建立未确知测度评价模型,通过熵权法指标定权和多指标测度矩阵计算等过程,根据置信度准则对管廊项目施工安全程度进行评价,以提高地下综合管廊施工安全评价的准确性与合理性.     

审计风险的未确知测度模拟计量研究

财务信息是企业提供给广大投资者和信息使用者的重要信息之一,然而,近年来,企业舞弊和会计信息失真已成为普遍的现象,如何将审计风险降低至可接受的水平,是审计执业界不可回避的一个问题.对审计风险的分析可以进行定性和定量研究,对审计风险进行定性研究的文章不少,而定量研究较少,本文用未确知测度来对审计风险进行定量评价,以将审计风险降低至可接受的水平.     

复有理灰数的运算及其性质

本文在区间灰数和信息型灰数推广的基础上,将有理灰数进行了推广,给出了复有理灰数的定义,并讨论了它的运算及其性质。     

Entry and the Number of Firms in the Swedish Pharmaceuticals Market

This paper analyses the factors that determineentry into the Swedish pharmaceuticals market. The analysis is based onpanel data for 22 different substances covering the years 1972 to 1996. Theresults show that profit opportunities in a particular market have apositive impact on entry. In addition, there is some evidence suggestingthat the length of the patent protection period has a negative impact onentry.     

基于可变模糊集理论的危险房屋鉴定应用分析

危险房屋鉴定结论和人们的经济利益紧密相关,常常存在各种问题。简要介绍了《危险房屋鉴定标准》(JGJ125—99)的鉴定方法,利用最大隶属度方法时常存在鉴定结论争议。应用可变模糊集理论,建议对房屋组成部分a级到b级的隶属函数问题加以修正,对房屋等级隶属度进行归一化处理;提出应用可变模糊集理论的判断准则-级别(类别)特征值确定房屋评定等级方法,有效地解决了最大隶属度方法的不足。工程实例计算结果反映实际情况,研究具有一定的现实意义。     

概率度量空间中Fuzzy映射的一个新的不动点定理

本文给出了一个新的概率度量空间中 Fuzzy 映射的不动点定理。本定理应用范围更广,更具普遍性。     

液压缸缸筒的模糊优化设计

本文提出液压缸缸筒的模糊优化设计方法。建立了以缸筒体积最小为目标函数的非对称模糊优化模型,并采用基于模糊综合评判的最优水平截集法求解;编制了相应的通用微机程序,给出了设计实例。     

空心杯永磁伺服电动机的设计分析及磁场计算

本文设计了采用高磁性能的钕铁硼磁钢的空心杯转子伺服电动机。并给出了磁场设计的分析和计算以及实例。     

Reducing the level of switching costs in mobile communications: The case of Mobile Number Portability

Switching costs are one of the most important economic forces that affect market competition in mobile communications. Both theoretical and empirical studies have shown that switching costs reduce market competition leading to higher prices, lower product and service quality, and lower customer welfare. Given their negative consequences, national regulatory authorities have designed policies aimed at reducing switching costs and fostering competition. One of the most important of these, in the mobile communications industry, is mobile number portability (MNP). The aim of this paper is to investigate the effect of MNP on switching costs in mobile phone services. First, a hierarchical Bayes model is proposed to measure switching costs at the customer level and to investigate the impact of MNP on them. Second, this study examines the drivers of MNP adoption by customers using a binary logit specification. The results reveal that this regulatory policy has significantly reduced the cost of switching and that MNP adoption partially depends on customer-related variables.     

RFID技术在炉号识别与对位连锁保护系统中的应用

用射频识别 ( RFID)技术 ,利用无线射频方式实现非接触双向通讯 ,达到识别目标和数据交换目的。利用电子标签的信息标示完成多目标识别 ,并通过炉号对准、通讯及三车连锁保护系统等方面的技术研究 ,建立了良好的焦炉信息管理平台 ,提高生产效益和管理水平 ,最终实现焦炉作业综合自动化。     

Regulation and competition in the European mobile communications industry: An examination of the implementation of mobile number portability

Over the past two decades, the mobile communications industry has seen a considerable drop in the consumer switching charges made by service providers in order to promote effective competition and ensure a level playing field for new market entrants. Mobile Number Portability (MNP) is an important regulatory measure taken to reduce switching costs, and it is believed to play an important role in fostering competition in the mobile market. MNP implementation has varied significantly across European Union countries, particularly with respect to porting time and customer fees, both of which are important factors when deciding whether to switch to another provider. The research examines the effects of MNP implementation on competition in the European mobile communications industry. The study findings indicate that subscriber churn rates are negatively affected by both the level of charges levied on subscribers wishing to maintain their current number (porting) when switching mobile providers and the length of time required to switch. The implications of the effectiveness of MNP regulation for competition in the mobile communications industry are discussed.