试论现代移动通信技术

笔者结合个人的实际工作,阐述了移动通信技术的发展历程,并对未来的通信技术发展做出进一步的探讨。     

The views of key stakeholders on an evolving food risk governance framework: Results from a Delphi study

Evidence of a decline in public trust associated with food risk governance over recent years has called into question the appropriateness of the current dominant risk analysis framework. Within the EU-funded SAFE FOODS project a novel risk analysis framework has been developed that attempts to address potential shortcomings by increasing stakeholder (including consumer) input, improving transparency, and formally incorporating benefit and non-health aspects into the analysis. To assess the viability of this novel framework, the views of food risk experts from the EU and beyond were sought using a distributed online questionnaire process called Delphi. In this paper the main results of this survey are described, revealing varying levels of support for the key innovations of the novel framework. Implications of our results for the new and old frameworks, for the future of risk analysis, and for the policy community more widely, are discussed.     

Do investors actually value sustainability? New evidence from investor reactions to the Dow Jones Sustainability Index (DJSI)

Research Summary: Research exploring investor reactions to sustainability has substantial empirical limitations, which we address with a large‐scale longitudinal financial event study of the first global sustainability index, DJSI World. We examine investor reactions to firms from 27 countries over 17 years that are added, deleted, or continue on the index. We find that once relevant controls and comparisons to observationally equivalent firms beyond the index are included, DJSI events have only limited significance and/or materiality. Nonetheless, investors' valuation of sustainability around the world has evolved over time, involving diminishing reactions to U.S. firms and increasing benefits, particularly of continuation on the index, over time. The study highlights the importance of careful analysis and longitudinal global samples in making inferences about the financial effects of social performance. Managerial Summary: The debate about how investors perceive corporate social responsibility (CSR) predates Milton Friedman's famous statement that the only social responsibility of business is to increase profits. Although extensive research has studied whether sustainability contributes to financial performance, we have yet to understand whether investors believe it pays off. This financial event study of reactions to the addition, continuation, and deletion from DJSI World, the first global sustainability index, shows that investors care little about DJSI announcements. Nonetheless, there is some evidence that global assessments of sustainability are converging and that investors may increasingly be valuing continuation on the DJSI, suggesting that firms may gain at least limited benefits from reliable sustainability activities.     

Inconvenience cost of mobile communication failure: The case of South Korea

Mobile communication failure can occur when mobile traffic exceeds the manageable level. This depends on frequency bandwidth. Mobile communication failure causes inconveniences in a user's daily life that lead to social and economic damage. To address this issue, mobile telecommunications companies deploy additional bandwidths and develop new technologies, but these are costly strategies. This study applies a spike model based on a contingent valuation method (CVM) to measure the inconvenience cost resulting from mobile communication failure. The mean monthly willingness-to-pay (WTP) to avoid communication failure per user is estimated to be KRW 898.14 (USD 0.80) over a period of five years in our study. The inconvenience cost borne by the population is estimated to be KRW 2.97 trillion (USD 2.61 billion). Users experiencing greater frequency of communication failure are found to be willing to pay more to avoid the inconvenience. When excluding respondents citing zero-WTP, the mean WTP per user was calculated to be KRW 3426.41 (USD 3.01). Data traffic usage and frequency at which communication failure is experienced are variables that exhibit statistically significant effects on WTP to avoid mobile communication failure. Overall, estimation results show that a price discrimination based on data traffic usage or quality can be considered by mobile telecommunications companies and regulators to address the issue of data traffic inducing mobile communication failure.     

团队氛围、董事会内部沟通与战略绩效

本文在理论分析的基础上提出研究假设,通过问卷调查的方式搜集数据,以47家企业董事会454份有效问卷为样本进行实证研究,结果表明,团队氛围中的团队信任对董事会内部沟通具有显著的正向影响;团队氛围中的情感冲突对董事会内部沟通具有显著的负向影响;董事会内部沟通对企业战略绩效中的团队学习力、决策有效性和战略一致性均具有显著的正向影响。研究不仅丰富了董事会团队过程理论,而且能够有效地指导公司治理实践。     

基于无线局域网标准的天然气长输管道通信系统的整合

通信系统在天然气长输管道的生产运营中起着至关重要的作用。目前陕西省天然气股份有限公司通信网由公司总部、西安、延安、杨凌分公司及22个输气场站等多个不同的独立建设的系统构成,各自独立建网形成了一个个“信息孤岛”。采用基于无线局域网标准的VOIP系统整合陕西省天然气股份有限公司通信网,一方面可使闲置的带宽得到充分利用．另一方面也能有效降低系统内部通信费用,有效消除通信障碍,提高工作效率和企业管理水平。     

万科企业品牌的营销沟通策略

文中从广告沟通、公关活动沟通、企业CEO营销沟通、绿色营销沟通等几个方面,对万科企业品牌的营销沟通策略行研究与分析。认为,万科在选择不同的沟通手段去提升品牌形象和影响品牌资产的动作中有三个方面值得肯定:一是强调信息的一致性,所有沟通手段和目标始终正确传递品牌定位;二是对不同营销沟通手段进行科学组合,努力做到整体大于部分之和;三是不断推进营销沟通内容的深入和营销手段的创新,最大化营销沟通效果。     

大学生跨文化交际能力的自我培养模式研究

针对我国外语教学缺乏真实的跨文化交际环境的实际,教师积极引导大学生进行跨文化交际能力自我培养符合我国国情和普通高校校情。英语教学实践表明：大学生对英语文化知识点的多维扩展式自主学习,可促进和加深他们对目的语语言文化的理解,有助于培养学生的跨文化交际能力,促使他们根据实际主动寻求跨文化交际机会,逐步提高跨文化交际能力。     

地区农网营业站通信解决方案探讨

本文就阳泉地区农村电网各营业站点的电力专用通信网建设问题进行讨论,阐述了利用VOIP模式和传统PDH+PCM方式的优缺点,并结合阳泉地区实际情况提出了解决方案。     

城市肌理的传承与更新——河西古镇开发中街道空间的延续

城市肌理是随着人类社会历史的发展而逐步演化的产物,是一个城市人文记忆和历史信息的载体,如何在城市肌理中延续城市的历史文脉,解读城市的人文记忆,构筑城市的美好未来,必然成为城市发展的重中之重。在河西古镇开发中如何保护原有城市肌理,延续城市的历史文脉,做到保护城市的历史信息和风貌特征的同时,又能改善人居环境,使新的城市肌理能够"有机切入"原有肌理,成为一个必须重视的现实问题。