认知型飞蜂窝网络中的子信道分配与功率控制

为了解决宏蜂窝与飞蜂窝构成的两层异构网络上行干扰与资源分配问题,提出了一种在认知型飞蜂窝的双层异构网中结合子信道分配和功率控制进行资源分配的框架。通过对异构网中跨层干扰问题进行分析与建模,将求解最优子信道分配矩阵和用户发射功率矩阵作为干扰管理问题的解决方法。模型中认知型飞蜂窝网络子信道和飞蜂窝网络用户构成非合作博弈,双方利用效用函数最优值进行匹配,构成初始信道分配矩阵;再由接入控制器根据接入条件从初始信道分配矩阵中筛选用户,并优化接入用户的发射功率矩阵,得到最优子信道分配矩阵和功率矩阵。仿真结果表明,优化框架提高了双层异构网络中飞蜂窝网络用户的吞吐量和接入率,降低了异构网中跨层干扰。     

一种Ka频段高密度高集成瓦式T组件的设计

介绍了一种Ka频段瓦式T组件的设计方法和关键技术。采用多层印制电路板(Printed Circuit Board,PCB)技术,实现了无源网络和馈电网络集成在同一块多层电路板上,滤波功能层和天线一体化集成,利用毛纽扣实现了组件的三维垂直互联。采用互补金属氧化物半导体(Complementary Metal Oxide Semiconductor,CMOS)工艺与砷化镓（GaAs）工艺相结合的芯片异构集成方案,成功研制出16通道带滤波功能层天线的T组件,体积为22 mm×22 mm×12 mm,质量不超过13 g。与同频段同功能的砖式T组件相比,体积缩减75%,质量降至10%。该组件充分发挥CMOS工艺强大的数模混合集成能力和化合物半导体工艺优异的射频性能,并将两类芯片在平面内直接异构拼装,在集成密度、功能密度、射频性能以及可实现性等多个方面获得了良好的平衡。     

Technology adoption and accumulation in a vintage-capital model

We present a model of capital accumulation and technology adoption in a vintage-capital framework. The model is an infinite-horizon/infinite-dimensional optimal control model: the firm employs a continuum of technologies (a continuum of heterogeneous capital goods). Capital goods are technology specific, their technology is related to vintage and technology progress. The entrepreneur maximizes the profits obtained by employing a continuum of technologies under the assumption of constant returns to scale and bearing adjustment costs for gross investments. The diffusion of a new technology is established by allowing the entrepreneur to invest in vintage capital goods.     

基于Web服务的异构数据库信息互用系统

异构数据库的集成是数据库界的一个研究热点,根据异构数据库的功能需求自行研制了1个异构数据库信息互用系统。该系统采用以Web服务组件为中心的3层分布式体系结构,Web服务组件完成全局查询语句的分解、翻译等工作,将Web服务引入本系统大大提高了系统的可管理性、可伸缩性和可维护性。     

基于演化博弈论的知识联盟动态复杂性分析

知识联盟是企业间为共同创造知识和进行知识共享而建立的联盟。本文从演化博弈论的角度,探讨了进行知识联盟的企业交互活动的复杂性可能对异质知识流的扩散和知识联盟稳定性造成多重可能结果。分析表明：一个企业实施知识流的更新（如建立知识联盟）和顺利扩散,取决于不同因素的作用,并表现出不同的复杂演化结果。对于已建立知识联盟的企业来说。这些不同的结果会对知识联盟的稳定性产生影响。如果企业最终都达到主动变流知识的策略选择状态,则异质知识得以在企业间扩散,从而强化企业间的知识联盟,但如果企业最终没有达到这一状态,则企业知识联盟的稳定性将被削弱。     

Neutral agents and social tolerance: a dynamic perspective based on economic interaction model with local social cost functions

The influence of neutral agents on the evolutionary dynamics of social tolerance is discussed based on a recently proposed economic interaction model with local social cost functions. We show that the dynamical structure of social tolerance is completely changed even if a few neutral agents are introduced into the society. Especially, the full intolerance steady state, which is stable in previous works, becomes unstable and avoidable due to the economic incentive introduced by the neutral agents. The necessary condition of achieving full tolerance is also reduced compared to previous works without neutral agents.     

Impact of individual market orientation on selling and customer orientation

ABSTRACT

We analyze the direct effect of individual market orientation on selling orientation-customer orientation of corporate insurance agents licensed in an emerging market based on the data collected using a random survey of corporate insurance agents in the Life Insurance sector in India. The results indicated that individual market orientation had a significant relationship with selling orientation, but the intensity was weak. However, causal relationship between individual market orientation and customer orientation was moderate. Future research should focus on analyzing the influence of the dimensions of individual market orientation on employee commitment, loyalty and should analyze the moderating effects of various associated variables. The findings indicate that efforts should be made to generate market-oriented behavior among individuals to propel selling orientation and customer orientation.     

Optimal cash holdings under heterogeneous beliefs

This paper explores a one‐period model for a firm that finances its operations through debt provided by heterogeneous creditors. Creditors differ in their beliefs about the firm's investment outcomes. We show the existence of Stackelberg equilibria in which the firm holds cash reserves in order to provide incentives for pessimistic creditors to invest in the firm. We find interest rates and cash holdings to be complementary tools for increasing debt capacity. In markets with a high concentration of capital across a small interval of pessimistic creditors or by a few large creditors, cash holdings is the preferred tool to increase the debt capacity of the firm.     

后危机时代中国木质家具出口影响因素及贸易潜力研究——异质性随机前沿出口模型实证分析

基于2009—2016年中国木质家具出口至105个贸易伙伴国(地区)的面板数据,构建异质性随机前沿出口模型,分析后危机时代中国木质家具出口影响因素及贸易潜力。结果表明:自由贸易协定、海运及港口基础设施和互联网普及率是贸易的促进因素;贸易壁垒、汇率波动、金融服务水平、海关手续负担、贸易自由度、货币自由度和互联网安全性是贸易的阻碍因素;港口基础设施和互联网普及率增加了贸易非效率的波动,加大了出口贸易效率的不确定性;贸易壁垒、汇率波动、金融服务水平、海关手续负担、货币自由度和互联网安全性降低了贸易非效率的波动,减少了出口贸易效率的不确定性。根据贸易潜力分析结果,将中国木质家具出口市场分为4种类型并提出相应的出口贸易布局战略措施。     

Learning How To Export

In this paper, we present a standard quality ladders endogenous growth model with one significant new assumption: it takes time for firms to learn how to export. It is known that the welfare gains from trade liberalization implied by a large class of models like the Armington gravity model, the Krugman model, and the Melitz model are small. Our quality ladders model is consistent with a number of firm‐level stylized facts from the heterogeneous firms trade literature and is, in addition, capable of generating very large welfare gains from trade liberalization.