接近香农限的编织卷积码设计与仿真

本文主要阐述了斜纹编织卷积码的编码结构、迭代译码以及活性距离和交织器对其误码性能的影响等基本概念。通过系统仿真,在AWGN信道下发现斜纹编织卷积码的系统性能与系统传输帧长和编码器个数都有很大的联系,其误码性能十分接近香农限,且没有错误地板效应。     

一种新型通用无线定位增值服务平台

基于现有无线定位系统种类多、覆盖范围小、业务单一的缺点,本文提出了一种新型开放式通用无线定位增值服务平台。该通用定位平台构架于现有的多个无线定位网络并独立于具体的无线通信网络,从而使定位功能和服务范围得到增强,适用于独立于无线通信网络的通用无线定位服务专业运营商。本文给出了通用无线定位增值服务平台的系统结构,然后讨论了基于GSM和3GPPParlayAPI规范的无线定位增值服务平台中间件功能层的定义以及该服务平台的功能,最后介绍了该增值服务平台可为独立的服务提供商提供的基于位置信息的具体应用。     

百色市可持续发展能力的生态评价

以百色市复合生态系统为研究对象,运用层次分析法,分别从经济发展、社会进步和环境保护3方面评价百色市2001～2006年的可持续发展能力的动态变化,分析制约其发展的因素,并提出相应对策.     

Division of Labor in Teams

This paper examines the incentive effects of division of labor on worker effort, in the absence of the scale effects studied by Adam Smith. The game-theoretic model gives two results. (1) Suppose workers are identical and risk-neutral, and there is stochastic observation of group output by the firm offering compensations subject to some worker-participation constraint. Then the firm can arrive at the same first-best outcome with or without division of labor. However, if workers are risk-averse, division of labor can give the firm strictly greater profit. (2) A deepening division of labor magnifies this positive incentive effect; but if workers are heterogeneous, or if there are certain informational imperfections in the production process, this incentive advantage of division of labor could be impaired or even reversed. The first result may help explain the emergence of division of labor in the early stages of industrialization without relying on the Smithian advantages, which are also present in some labor deployment schemes without division of labor. The second result throws light on some recent anecdotal evidence of a shallowing division of labor in some areas of modern manufacturing. These factors affecting the efficiency of division of labor are then further discussed in the light of recent empirical findings on division of labor and team work, such as those in Katzenbach and Smith (1993).     

股票流动性与企业创新：促进还是抑制——企业异质性视角

基于2010—2017年我国沪深A股1281家上市公司数据，从企业异质性视角分析股票流动性对企业创新的影响。结果发现：总体来看，股票流动性会抑制企业创新，而且对后期抑制作用更大；企业规模和行业特征是影响“股票流动性-企业创新”关系的重要因素，即股票流动性对大型企业和传统行业企业创新具有促进作用，而对中小型企业和高科技行业企业具有抑制作用。进一步机制研究显示，稳定型机构投资者和交易型机构投资者在股票流动性与企业创新间起双中介作用，虽然股票流动性对二者的作用方向相反，但最终都会导致企业创新水平下降。     

Sun Yat-sen and Henry George:

A bstract . Of Sun Yat-sen's "Three Principles of the People," the third principle, namely the People's Livelihood, forms the ultimate goal for social welfare. In this principle Dr. Sun tried to syncretize the economic theories of the West and adapt them within the Chinese context.
The equalization of land ownership through taxation of self-assessed land values, and the land value increment tax are the most essential ingredients of the third principle. Underlying Dr. Sun's concept of equalization of land ownership is the unearned increment theory of Henry George.
Dr. Sun conceived of agrarian reform as basic to the solution of the livelihood problem. Henry George also saw the cause of distress and destitution in the defective land tenure structure and the monopoly of land.     

A theorem on open coverings of a simplex and Scarf's core existence theorem through Brouwer's fixed point theorem

Summary This paper provides simple proofs of a theorem on open coverings of a simplex and Scarf's core existence theorem through Brouwer's fixed point theorem.I want to thank Daniel Abrams, Yakar Kannai, Herbert Scarf, Nicholas Yannelis, Jingang Zhao, and an anonymous referee for their helpful comments. I also gratefully acknowledge the financial support from the Alfred P. Sloan Foundation.     

All for one,one for all: Coopetition and virtual team performance

This study establishes a model based on coopetition theory to explain the formation of team performance in virtual teams. We tested the model in information technology (IT) organizations, and found applicability of coopetition in influencing team performance and knowledge sharing. Knowledge sharing is indirectly influenced by team politics and social capital (i.e., trust, social interaction and shared vision) via the mediation of cooperation and competition, while team performance is indirectly affected by team politics and social capital via the mediation of cooperation, team emotional intelligence and team competence.