数字蜂窝式移动电话系统现状与发展

目前在世界上许多国家运营的蜂窝式移动电话系统如北欧四国的 NMT、美国的AMPS、联邦德图的 C 网、英国的 TACS、日本的 NAMTS,我国在北京、上海和广州运营的 TACS 和爱立克森系统都属第一代模拟式移动电话系统。为了满足更多用户的要求,建立符合统一技术标准的系统,欧州许多国家在移动通信专业组(GSM)组织协调下,提出了多种系统方案,即第二代数字蜂窝式移动电话系统试验系统方案。本文对这几种系统,重点对 CD900、S900D,作了全面介绍。并从多址技术、信道编码、语音编码、调制技术以及经济性等方面进行了分析和评估。     

安徽移动服务差异分析及改进策略探讨

服务质量是决定服务性企业营销效果、经济收益的最重要因素.文章借助于服务质量差异模型对安徽移动服务质量现状进行了深刻分析,从服务过程质量管理与控制角度分析,提出了增强服务意识、提高服务技巧、加大服务有形展示的力度、管理顾客等质量改进策略.     

Diffusion of mobile telephony: An empirical study in Taiwan

Mobile telephony penetration is a major indicator of mobile telephony diffusion. Taiwan had a mobile telephony penetration of 108% in 2002, ranking first in the world. This study analyzes this accelerated diffusion in terms of growth model and determinants of the diffusion rate. To eliminate the inherent uncertainty associated with choosing the optimal growth model, this study compares the performance of three conventional models, namely Gompertz, Logistic and Bass, to identify the most appropriate model, and to distinguish the forces driving the diffusion rate. Empirical results indicate that the most appropriate model is the Logistic model. Network externalities, which this study shows to be the same as the imitation effect in the Bass model, explain the superiority of the Logistic model. Moreover, market competition, which markedly reduces service prices, is identified as a primary driver of the diffusion rate of mobile telephony in Taiwan. Economic conditions, technological innovation and number of operators are insignificant factors. Finally, mobile telephony is a substitute for fixed-line telephony in Taiwan.     

Mobile technology usage and B2B market performance under mandatory adoption

This paper investigates the relationship between mandatory adoption of mobile information technology and market performance in the business-to-business (B2B) setting. This study presents and tests the B2B technology satisfaction model (TSM), including perceived loss of control as the mandatory technology acceptance-specific variable. The results of this study reveal that integrating perceived loss of control with user satisfaction and the TAM (technology acceptance model) in a single model can better explain the B2B market performance model. The empirical results suggest that perceived loss of control has a negative effect on user satisfaction and perceived market performance is influenced by user satisfaction and perceived usefulness. Managerial implications of the study are discussed.     

电子货币影响短期利率的实证研究:基于狭义电子货币的视角

基于电子货币的狭义定义,本文从狭义电子货币影响货币供求的角度选择影响短期利率的解释变量并构建理论模型。在控制其他影响因素后,发现狭义电子货币对30天期Chibor利率的直接影响并不显著,而主要受传统货币电子化、移动网络等支付技术发展影响的变量,如货币供给流动性、金融电子化程度以及现金漏损率与30天期Chibor利率之间存在长期协整关系,货币供给流动性、金融电子化程度以及现金漏损率对30天期Chibor利率的影响方向均为正。     

论日本早期的城市化

日本早期城市化是日本城市化的一个重要阶段,对之进行研究在今天仍具有重要意义.日本城市化建立在农业生产率的提高、工业化的发展和交通运输条件的改善等有利条件上,它不仅表现为这一时期城市数量的增加、城市人口的快速增长,而且表现为城区面积的扩展.日本早期城市化给日本社会经济的发展带来了极大的影响：它推动了工业化的进程,促进了农业的发展,进而改变了城乡关系,引起家庭结构的变化、城市居民生活的变化,还直接推动日本政治现代化的发展.当然,在日本城市化的过程中,也出现了一些难题,进而衍生出各种社会问题,困扰着日本城市化的发展.日本政府采取了一些措施来解决这些问题,并取得了一些成效.     

一种实用的无线信道纠错方法

核心竞争力是企业适应市场的潜力。中国某些企业由于缺乏核心竞争力而使其市场份额逐渐缩小。为了适应国际市场竞争的形势,发展企业核心竞争力是重中之重。为此,除了企业加强自身建设以外,政府应该利用法律和政策,充分利用加入WTO以后宝贵的“缓冲期”,使国内市场尽快完善,促进企业核心竞争力的不断提高。     

The Communication of Corporate Social Responsibility: United States and European Union Multinational Corporations

This study explores corporate social responsibility (CSR) by conducting a cross-cultural analysis of communication of CSR activities in a total of 16 U.S. and European corporations. Drawing on previous research contrasting two major approaches to CSR initiatives, it was proposed that U.S. companies would tend to communicate about and justify CSR using economic or bottom-line terms and arguments whereas European companies would rely more heavily on language or theories of citizenship, corporate accountability, or moral commitment. Results supported this expectation of difference, with some modification. Specifically, results indicated that EU companies do not value sustainability to the exclusion of financial elements, but instead project sustainability commitments in addition to financial commitments. Further, U.S.-based companies focused more heavily on financial justifications whereas EU-based companies incorporated both financial and sustainability elements in justifying their CSR activities. In addition, wide variance was found in both the prevalence and use of specific CSR-related terminology. Cross-cultural distinctions in this use create implications with regard to measurability and evidence of both strategic and bottom-line impact. Directions for further research are discussed. Laura P. Hartman is a Professor of Business Ethics and Legal Studies in the Management Department in the College of Commerce at DePaul University, as Associate Vice President for Academic Affairs of the University and as Research Director of DePaul’s Institute for Business and Professional Ethics. She is also an invited professor at INSEAD (France), HEC (France), the University of Melbourne, the Université Paul Cezanne Aix Marseille III and the Grenoble Graduate School of Business. She has been published in, among other journals, Business Ethics Quarterly, Business & Society Review, Business Ethics: A European Review, and the Journal of Business Ethics. Robert S. Rubin is an Assistant Professor in the Management Department at DePaul University’s Kellstadt Graduate School of Business. He received his PhD in organizational psychology from Saint Louis University. His current research interests include transformational leadership, leader cynicism, social and emotional individual differences, and management education and development. K. Kathy Dhanda is an Associate Professor at the Department of Management at DePaul University. Her areas of research include sustainable supply chains, environmental networks, marketable permit modeling, sustainable management, and public policy.     

The Theoretical Ground for Public Relations Practice and Ethics: A Koehnian Analysis

Public relations literature laments the lack of a theoretical base for the practice and ethics of public relations. Drawing primarily upon Koehn (The Ground of Professional Ethics, 1994) and Hutton (Public Relations Review, 1999), this paper proposes such a theoretical ground.The paper adopts Hutton's assertion that "the central organizing theme of public relations theory and practice" is relationships(Hutton, 1999, p. 209). It also relies upon Koehn (1994) to provide a theoretical discussion of the nature of professions, and the ground upon which professional ethics and public trust in the professions are based. It concludes, from a Koehnian perspective, that for public relations to move from the expertise and contractual models of practice into a covenantal model as a profession worthy of public trust, the field must devote itself to a defined human good (relationships), and must be grounded in a public pledge to serve this good.     

信道估计偏差对空时编码的OFDM系统性能的影响

本文研究了采用空时编码的OFDM系统的性能，通过Monte Carlo仿真分析了系统性能和信道估计偏差对系统的影响。