普惠金融的反贫困效应研究——基于西部地区的面板数据分析

本文基于2005~2015 年西部12 省市（区）数据,测度普惠金融发展水平、贫困程度,运用面板数据实证检验普惠金融的反贫困效应,研究表明：（1）西部地区普惠金融发展水平整体较低,发展速度缓慢,省际差异明显;（2）西部地区的扶贫开发取得了明显效果,贫困程度较轻;（3）从普惠金融的各个维度看：金融服务覆盖率、金融服务可得性以及金融资源的实际使用效率对贫困均有明显的减缓作用;（4）普惠金融对西部地区反贫困效应整体显著,但分省效果并不明显。最后,就发展普惠金融以减缓西部地区的贫困现状提出相关的政策建议。     

Local accessibility inequalities and willingness to walk in Latin-American cities: Findings from Medellín,Colombia

As planning for accessibility is becoming a priority for most cities, policies encouraging short-distance traveling and the use of active modes of transport are gaining force. Emphasizing short-distance travel and localized practices can produce positive sustainable outcomes, but in order to design proper public policies, a deeper understanding of the determinants of this mobility of proximity is still needed. This paper uses mobility data from the city of Medellín, Colombia, to examine the role of local accessibility and the proximate scale in the city's everyday mobility. The analysis aimed at testing whether significant efforts on improving local conditions and fostering local mobility would help to improve social exclusion and transport disadvantage situations by alleviating the need of motorized and long-distance transport. Unlike most traditional analysis, proximity is not defined by Euclidian distance but instead using travel and modal choice variables. Results show the relevance of socioeconomic variables at determining travel behaviors as well as the importance of local accessibility for social groups in situations of transport disadvantage.     

“长三角”地缘经济关系的测度分析

地缘经济关系对区域经济的协同发展有着重大影响。文章首先设计了一个地缘经济关系的测度体系,进而对"长三角"区域15个地区的地缘经济关系进行了定量测度,最后提出了相关的政策建议。     

How close do we feel to virtual product to make a purchase decision? Impact of perceived proximity to virtual product and temporal purchase intention

This study, utilizing construal level theory, aims to understand the underlying effect of perceived proximity to a virtual product on perceived purchase intention in the near future through perceived measurement feedback and perceived generality. This research examines a lab experiment to test six hypotheses. Results indicate that perceived proximity to virtual products enhances perceived measurement feedback and, thereby, perceived generality. In addition, perceived generality fully mediates the effect of perceived measurement feedback on perceived purchase intention in the near future when consumers interact with non-augmented reality applications. In contrast, perceived measurement feedback directly influences perceived purchase intention in the near future in AR applications. Furthermore, the absence of product in consumers’ consideration set dilutes the effect of perceived generality on perceived purchase intention in the near future when consumers interact with non-augmented reality application. This study suggests several managerial implications for AR developers and online retail managers.     

Market Moods and Network Dynamics of Stock Returns: The Bipolar Behavior

The authors show that a simple mood-separable preference in a network study of stock returns captures a variety of stylized facts regarding stocks’ provisional (ab)normal behavior. These behaviors are articulated in a multistate complete Euclidean network model that specifies the existence, direction, and magnitude of a self-organized dynamics for each individual stock during abnormal market moods. In the empirical setting, the authors apply suggested model along with 2 established visual approaches (multidimensional scaling and agglomerative hierarchical clustering) for benchmark purposes. Results reveal different levels of erratic return dynamics for each stock and the entire market in different abnormal market moods. The authors model and interpret these self-organized dynamics as evidence of stocks’ and market’s bipolar behavior.     

平台侧位置指纹定位系统中接收端问题的优化

当前室内位置指纹定位系统主要用于对移动端的定位。借鉴其定位机理，研究了对无线电发射端的定位,属于平台侧位置指纹定位系统。从部署接收端的位置以减小定位误差的角度出发，提出了增大参考点之间欧式距离确定接收端位置的方案。同时，提出利用覆盖率的概念确定定位区间的接收端个数以满足区间定位的需求。建立了接收端位置及个数优化问题的数学模型，并用遗传算法和全覆盖原则对优化问题进行求解，给出了优化问题的实现流程。针对不同空间，对优化问题进行了仿真，比较了经验布置接收端和优化布置接收端的定位结果误差及接收端是否满足全覆盖的定位结果误差，验证了所提方法的合理性，对定位前部署接收端的个数和位置有一定的指导意义。     

How rich countries became rich and why poor countries remain poor: It's the economic structure…duh!

Becoming a rich country requires being able to produce and export commodities that embody certain characteristics. We classify 779 commodities (exported) according to two dimensions: (1) sophistication (measured by the income content of the products exported) and (2) connectivity to other products (measured by how easy it is to ‘jump’ into other potential exports). We identify 88 “good” products (highly sophisticated and well connected products), 93 “bad” products (unsophisticated and poorly connected products), and 598 “middle” products. Then, we categorize 154 countries into four groups according to the export share of each of these three types of products. There are 21 countries whose export baskets contain at least 15% of “good” products; 41 countries with a significant share of relatively sophisticated and well connected products; 50 countries with a significant share of relatively unsophisticated and not well connected products; and 42 countries whose export basket contains at least 15% of “bad” products.     

The Effects of Financial Statement Information Proximity and Feedback on Cash Flow Forecasts*

The Financial Accounting Standards Board (FASB) and International Accounting Standards Board (IASB), in their joint Financial Statement Presentation project, are reconsidering the basic format of financial statements. The Boards’ preliminary discussions related to this joint project indicate that they intend to modify the required financial statements to increase the proximity of performance‐related information for each reported period. We provide evidence related to this potential change by investigating the effects of financial statement information proximity on investors’ ability to learn the forecast‐relevant time series properties of reported cash flows and accruals. We also examine the role feedback plays in this relationship. Our experimental results suggest that nonprofessional investors are able to more quickly learn the relation between current period cash flows and accruals and future cash flow realizations when financial statement information is presented in a single statement rather than separated into two statements. In addition, we find that nonprofessional investors exhibit lower levels of absolute forecast errors and less forecast dispersion when financial statement information is unified into a single statement. Finally, we provide evidence that nonprofessional investors who receive extensive outcome feedback on a single page initially learn more quickly and later, after learning has leveled off, accurately forecast more consistently than do investors who receive extensive or limited feedback spread across two pages. Overall, our results provide evidence on the effectiveness of alternate financial statement presentation formats and the potential usefulness of receiving more extensive feedback.     

基于Harris和SIFT的特征匹配算法

为了克服传统的局部特征匹配算法对图像的尺寸和旋转比较敏感的缺点,文章提出了一种基于Harris和SIFT的特征匹配算法。该算法首先进行Harris角点提取,利用圆的旋转不变性和多维向量来构造SIFT特征描述子,然后利用极线约束降低对匹配点的搜索空间,最后度量特征描述子之间的欧氏距离,运用双向匹配技术得到最终的匹配结果。实验结果表明,该算法能提高匹配精度,减少匹配时间。     

Culture and knowledge spillovers in Europe: New perspectives for innovation and convergence policies?

Using European patent citations, we examine the geography of knowledge flows within Europe. We aim at analysing whether technologies flow more rapidly among countries that share similar economic, geographic, technological or cultural characteristics. The specificity of our approach consists in integrating indicators of culture and cultural similarity. The empirical results suggest that cultural distance has only a mitigated and moderate impact in comparison with other proximities. On the contrary, cultural belonging is shown to influence the geography of knowledge flows and innovation. More precisely, if some populations develop thanks to external knowledge exploitation, others rather explore internal new ideas and knowledge. In such a differentiated context (we find three types of culture), the efficiency of innovative policy seems to be culturally dependent.