When a Loser Gains: Free Riding in the Innovation of Network Goods

We consider duopolists innovating and producing a good subject to network externalities. If successful in R&D, a firm sells both the old product and the new one. The new product increases the utility of its user; it also generates a higher network externality than does the old product. A firm which fails to innovate nevertheless profits from the success of the rival: the network effect raises the value of the old product it still produces. A firm free-rides on the innovative efforts of another firm, reducing the incentives of any firm to innovate.     

经济新常态下金融包容与产业结构转型——基于中国省级面板数据的分析

在经济新常态背景下,产业结构面临重大调整,金融包容的融入,使中小企业或个人能够获得价格合理、方便快捷的金融资源,扶持创业创新发展,形成新的增长动力。本文基于1995～2012年中国31个省市的相关数据,运用面板数据模型和分位数回归方法,深入探讨金融包容对产业结构转型的影响。结果表明,金融包容与产业结构转型具有显著的正向关系,并且在不同分位点上金融包容水平对产业结构转型表现出较强的解释力,随着产业结构向高级化发展,金融包容在产业结构转型升级中的作用逐步凸显。经济增长、教育发展、财政支出规模和城市化水平均对产业结构转型具有促进作用,而过多的物质资本投入不利于产业结构转型。     

人体下肢运动能力测评研究

人体在短距离奔跑及跳跃时,足底压力的大小并不仅仅和体重相关,还反映了下肢运动能力的强弱。为了能够客观评价下肢的运动能力,设计了一套测试系统。采用压力传感器对足底压力进行测量,数据通过单片射频收发器件NRF24L01无线模块传输到微机中,记录下不同测试条件下的压力峰值。实验采集了12位测试者在慢走、快跑时的足底压力,分析了足底压力峰值与体重之间的关系。结果表明:压力峰值与体重的比值较小的人,下肢运动能力较弱一些;压力峰值与体重的比值较大的人,下肢运动能力较强一些。根据测评结果,可对人们的身体素质提升提出相关建议,对处于成长期的青少年尤为重要。     

Financial components of FDI and choice of capital structure: an analysis for 30 OECD countries

Even though the choice of capital structure depends on the three different financial components of foreign direct investment (FDI), previous research has regarded FDI as unidimensional rather than multidimensional. This study addresses new findings in the FDI area and investigates the relevant determinants of capital structure in 30 OECD countries from 2006 to 2014 within the framework of a simultaneous equation model. Our primary findings reveal that each component has its own deterministic features driven by relevant policy variables and risks in the market. While an increase or decrease in equity capital shows the ability of the host country to attract new investments, the subsequent components are mostly used to adjust the equity capital investment exposure.     

Firm heterogeneity and immigrant wage assimilation

This article investigates the role of job mobility in immigrant wage assimilation. I use longitudinal linked employer–employee data for Portugal to estimate the immigrant wage catch-up in log wage regressions with both individual and firm fixed effects. I show that moving to firms with higher wage premiums accounts for approximately 30% of the immigrant wage catch-up in the first years.     

学院计算机校园网的规划,设计与管理

校园网的建设对于提高我院的教学科研管理水平,营造高科技信息的教学科研实验环境,培养面向世界、面向未来的高层次经济管理专门人才有着极为重要的作用。本文就此讨论了我院校园网的建设规划以及设计的有关问题,并给出了校园网的拓扑结构及网络设备配置的基本方案,同时对今后校园网的管理与使用以及进一步的发展作了相应的论述。企望能以此得到各级领导及广大师生与研究人员对校园网的建设以更大的支持和参与。     

国土资源数据整合方案设计及其实现研究

研究目的：基于国土资源数据现状,提出有效整合方案,为国土资源信息化建设提供借鉴。研究方法：以ETL技术框架为基础,结合数据挖掘技术和GIS技术,设计符合国土资源数据整合要求的解决方案,并以常州市为例进行实证研究。研究结果：数据整合方案有效快捷地解决了常州市国土资源数据整合。研究结论：方案智能化提高了数据整合过程的数据分析能力、处理能力和效率,有效地从国土资源数据本身解决了整合难题,对市县级国土资源数据整合有借鉴意义。     

Optimal distribution of the injured in a multi-type transportation network with damage-dependent travel times: Two metaheuristic approaches

We study a location-allocation-routing problem for distribution of the injured in a disaster response scenario, considering a three-type transportation network with separate links. A circle-based approach to estimate the impacts of the disaster is presented. After formulating relations for computing the percentage of the injured, the destruction percentage and the damage-dependent travel times, the problem is formulated as an integer nonlinear program. We utilize a genetic algorithm and a discrete version of the imperialist competitive algorithm for solving large problems. An empirical study focused on earthquakes in Tabriz, Iran, illustrates applicability of the proposed model and performance of the proposed algorithms.     

深空天线组阵相关合成算法的Simulink仿真与分析

为对深空网天线组阵中几种相关合成算法进行分析比较,构建了一种新的Simulink仿真模型。将其应用于某测控站天线组阵试验数据,验证了模型的可行性。在此仿真模型下,对Simple、Sumple和Matrix-free 算法进行了频标同源/频标不同源、弱信号/强信号、2/3/6个天线等组阵情况下的仿真分析。三种算法在频标同源情况下的合成效率均优于不同源的情况;强信号组阵情况下,三种算法的信噪比合成性能基本相当;Simple算法在6天线情况下,信噪比合成性能下降;Sumple算法在组阵的天线数目很少时,合成信噪比较低且不稳定,在天线数目较多时性能良好;Matrix-free算法性能稳健,合成效率始终大于95%。该Simulink仿真模型对于进行天线组阵信号相关算法的分析具有一定的价值。     

Dialect,transaction cost and intra-national trade: evidence from China

Growing evidence emphasizes the important role of network effects on bilateral trade. This paper proposes a new factor – dialect difference, which decreases social network across regions, may increase transaction costs and thus shape interregional trade pattern. Taking China as an example, we use a gravity model considering network effects and provincial data from 1997 to 2009 to examine the effect of dialect difference on intra-national trade. We find that dialect difference has a significantly negative effect on interprovincial trade. Moreover, this paper explores the time dimension of the effect of dialect difference. We find that the negative effects of dialect difference on trade have been diminishing over time. Migration and the promotion of Mandarin have increased interregional cultural connections and thus mitigated the negative effects of dialect difference.