多跳CC-HARQ中继网络的频谱有效性跨层设计

在瑞利衰落信道中,为改善采用Chase合并混合自动重传请求(CC-HARQ)协议的多跳中继网络的频谱效率性能,考虑发送帧长和发送功率的跨层优化,研究了提升其频谱效率的跨层优化策略。不同于传统的中断概率分析,通过利用对数域线性阈值的平均误帧率估计方法,给出了多跳CC-HARQ协议频谱效率的精确表达式,在发送功率固定时设计了最优发送帧长策略,在发送帧长固定时设计了最优发送功率分配方案,进一步提出了跨层的联合优化方案。仿真结果验证了所设计优化方案在理论上的正确性和有效性,同时在仿真中可以观察到采用跨层的优化策略后,多跳CC-HARQ中继网络的频谱效率获得了显著的提升,其中跨层的联合优化方案比传统的固定帧长等功率策略在频谱效率上提升了0.014 b/s·Hz-1。     

Entrepreneurship,export orientation,and economic growth

In this paper the relationship between a country’s prevalence of new ventures and its rate of economic growth is investigated, while taking into account new ventures’ export orientation. It is generally acknowledged that new venture creation as well as export activity may both be important strategies for achieving national economic growth. However, to our knowledge no attempt has been made to investigate empirically the role of export-driven new ventures in economic growth. We focus on the national level and use data for a sample of 34 countries over the period 2002–2008. Our results suggest that, on top of a positive relation between entrepreneurial activity in general and subsequent macroeconomic growth, there is an additional positive effect of export-oriented early-stage entrepreneurship in higher-income countries. However, there is no such additional effect in lower-income countries.     

如何实现合同的规范化管理

一个企业的经营成败和合同管理有密切关系,现代企业若能对合同实施有效管理,将为企业管理水平和经济效益的提高产生巨大的推动力,促进企业稳步发展.本文主要谈谈合同管理与企业稳步发展的关系.     

Does involvement matter in online shopping satisfaction and trust?

Consumer involvement in online shopping can play a moderating role when explaining Web site effect on satisfaction and trust. This study proposes a set of hypotheses based on the Elaboration Likelihood Model (ELM) of persuasion, a conceptual model that explains the formation of individual attitudes that are prompted by central and peripheral cues. The model proposes the use of central signals when the buyer is highly involved and peripheral signals when the buyer is less involved. Nevertheless, the results of this study would suggest that these relationships are not so clearly defined in the case of online buying, which implies that certain assumptions associated with the ELM need to be revised to take the particularities of the online context into account. © 2011 Wiley Periodicals, Inc.     

企业社会责任履行、R&D投入与财务绩效——基于我国主板上市公司的经验证据

在当前市场竞争环境中,社会责任履行情况已成为企业竞争的重要因素之一,而企业选择主动承担社会责任是否能够有效促进财务绩效的提高和企业价值的实现?基于我国A股上市公司2010-2015年六年数据共3181个研究样本,研究不同作用机制下企业社会责任履行情况、R&D投入与财务绩效的三者的复杂关系。实证结果表明：（1）企业履行社会责任与财务绩效呈正相关关系;（2）不同的作用机制不会改变企业社会责任履行与财务绩效的正相关关系;（3）技术创新投入增强了企业社会责任对企业财务绩效的积极影响,但是这一结果主要是基于研发投入与战略性社会责任的履行保持一致对企业绩效产生正向的刺激效果,而研发投入对利他性社会责任与财务绩效的调节作用表现并不显著。     

Health,Education and Emergence from the Development Trap

Abstract: This paper studies the emergence of developing countries from a development trap. It shows that countries whose dynamics exhibits several growth peaks can be considered as cases of equilibrium jump. Applying this criterion to a sample of 65 countries that were initially very poor in 1950, it identifies 13 such countries, called ‘emerging economies’. Comparing emerging and non‐emerging economies in the 1950s and early 1960s, it shows that economic take‐offs starting in the 1960s can be related to health and education in the early 1950s, while other possible factors, such as savings, openness and democracy are not significant.     

木质家具支持性产业国际竞争力比较分析

支持性产业是波特国家竞争优势的第三个关键要素。本文以国际商品统计局（COMTRADE）数据为来源,对木质家具支持性产业森林培育业、人造板业、家具五金业、灯具业和木工机械业的国际竞争力进行比较与分析,提出中国应通过发展产业集群来培育雄厚、具有国际竞争实力的木质家具支持性产业。     

企业节能减排绩效考核评价体系研究

企业作为能源消耗的主体,同时也是污染物排放的主要来源,对完成节能减排目标任务肩负重任。因此,建立一套科学合理的节能减排绩效考核评价体系成为迫切的现实需要。本文对构建企业节能减排绩效考核评价体系进行了探索,从考核评价体系指标选取需遵循的原则,各层指标的确定,各层指标权重值的确定以及考核评价体系的构建等方面进行了深入分析,旨在为提高企业节能减排工作管理水平提供一个有益的参考。     

基于公平分配视角探讨创新社会管理机制的路径

完善社会管理,有利于维护社会的公平正义,有利于社会的安定有序,有利于实现社会的利益均衡。依据分配不公的现实,从公平分配的视角,在构建社会主义和谐社会的大背景下,提出建立更新社会管理理念的先导机制;建立健全社会管理利益平衡的主导机制;创新社会管理方法的向导机制。