Interbank loans,collateral and modern monetary policy

This study develops a novel agent-based model of the interbank market with endogenous credit risk formation mechanisms. We allow banks to exchange funds through unsecured and secured transactions, which facilitates the flow of funds to the most profitable investment projects. Risk premiums result from banks׳ forecasting rules and depend on past performance of the benchmark risk factors and interest rates. Our model confirms basic stylized facts of the interbank interest rates and volumes. We also find that network structures within the secured market segment are characterized by the presence of dealer banks, while we do not observe similar patterns in the unsecured market. We perturb the model with exogenous shocks and policy scenarios which correspond to unconventional monetary policies.     

On the multi-dimensionality and sampling of air transport networks

Complex network theory is a framework increasingly used in the study of air transport networks, thanks to its ability to describe the structures created by networks of flights, and their influence in dynamical processes such as delay propagation. While many works consider only a fraction of the network, created by major airports or airlines, for example, it is not clear if and how such sampling process bias the observed structures and processes. In this contribution, we tackle this problem by studying how some observed topological metrics depend on the way the network is reconstructed, i.e. on the rules used to sample nodes and connections. Both structural and simple dynamical properties are considered, for eight major air networks and different source datasets. Results indicate that using a subset of airports strongly distorts our perception of the network, even when just small ones are discarded; at the same time, considering a subset of airlines yields a better and more stable representation. This allows us to provide some general guidelines on the way airports and connections should be sampled.     

论高速铁路精密工程测量“三网合一”

客运专线铁路对测量精度要求较高,传统的分阶段布网方式和方法已不能满足现代高速铁路建设的需要。文章提出了＂三网合一＂的测量体系和布设原则及控制网的精度梯度等级,该体系的建立能统一高速铁路勘测控制网、施工控制网、运营维护控制网的起算基准和协调其精度,保证无碴轨道铁路工程的顺利实施。     

Exploring the core factors of online purchase decisions by building an E-Commerce network evolution model

With the continuous development of the Internet and information technology, online shopping has become a popular purchase mode. The in-depth analysis of consumer decision-making in online shopping is an important issue. Our purpose is to study how the factors of the shopping web pages corporately affect online purchase decisions and determine which are the core factors that affect consumer purchase decisions. We screen the influencing factors on the shopping webpage and deploy e-commerce network evolution based on various weight combinations of these factors to generate sales distributions of online products. By comparing these simulated sales distributions to the real data, the optimal weight of each factor is obtained. The results show that sales volume and the number of high-quality negative comments are the most important factors influencing consumers' decision-making, the number of comments and the number of comments with pictures are relatively minor factors, store type and video presentation of the products have the least impact. The optimal simulated sales distribution is very close to the real case and verifies that the introduced network evolution technology is applicable. The proposed model can be used as a uniform evaluation platform for correlational study, which is an important link in the purchase research chain.     

重大突发公共卫生事件科技研发应急体系运行机制研究

在突发事件应急管理过程中,科技研发支撑作用十分关键,亟需建立突发公共卫生事件科研应急体系长效运行机制。基于科技研发应急体系的复杂性、适应性特征,从主体属性和体系架构两个层面入手,分析重大突发公共卫生事件科技研发应急体系的复杂适应系统特征,运用复杂适应系统理论模型和动态闭环螺旋模型,研究重大突发公共卫生事件科技研发应急体系运行机制。研究发现,重大突发公共卫生事件背景下,科技研发应急体系具有复杂适应系统的7个基本特征,是典型的复杂适应系统;科技研发应急体系中,科研攻关专家组、诊疗医院、科技部门等科研主体具有各自内部模型,并通过6大标识进行聚集;科技研发应急体系存在事件—需求引导、主体协同、资源交互、成果转化机制。同时,新冠病毒肺炎疫情应对实践表明,疫情防控救治进程中科技研发应急体系存在并遵循上述运行机制。     

政策网络的结构与治理:以我国房地产宏观调控政策为例

房地产的宏观调控是我国政府公共管理能力的核心体现,然而,近年来其调控效果并不显著.作为一种新兴的分析工具--政策网络能较好地掌握与处理多元角色参与公共政策制定的议题.因此,本文从政策网络的视角,通过理论研究和案例分析,探讨房地产政策网络的结构特征及其治理机制.研究发现:我国房地产宏观调控的困境关键在于政策网络的开放度太...     

基于低碳视角下武汉城市圈生态旅游综合体联动机制探析

在全球践行低碳理念发展的大背景下,生态旅游综合体已然成为旅游业发展中的重要趋势之一。本文在总结前人研究成果和相关理论基础上,通过分析生态旅游综合体联动要素,明确低碳视角下生态旅游综合体的联动机理、联动动机,进而构建武汉城市圈生态旅游综合体联动模型,并提出联动机制的优化策略。     

Networking responses to different levels of institutional void: A comparison of internationalizing SMEs in Egypt and the UK

This paper reports a comparative qualitative study of how decision-makers in internationalizing SMEs respond to relevant institutions in their domestic environment through networking activity. Twenty SMEs are compared respectively from a developing economy (Egypt) and a developed economy (UK). The two countries contrast both in the effectiveness of their institutional support for SMEs and in their cultural norms towards network relationships. Substantial differences are found between the two national samples in SME decision makers’ networking behaviour in response to specific institutional conditions. The links between institutional conditions, national cultural norms and SME networking responses are explicated in a new theoretical model.     

多层级视角下京津冀科技创新政策府际关系研究

府际关系协调有利于实现创新资源、要素的有效汇聚与整合,进而提升政策有效性。以京津冀为例,构建中央-地方多层级府际关系模型,分析中央政策主体合作网络特征与政策扩散特征、地方政策主体合作网络特征与政策执行特征的相关性。研究发现,中央政府部门间形成了以科技部为核心的核心—边缘网络结构特征;北京市政府部门间呈现出以中关村科技管理委员会为核心的核心-边缘网络结构特征;天津市政府部门间呈现出以天津市科学技术委员会为核心的星型网络结构特征;河北省则没有形成稳定的网络关系。中央政策主体合作网络中的度中心性与政策扩散广度具有相关性;地方政策主体合作网络中介中心性、度中心性与政策执行强度具有相关性。     

Migrant networks, language learning and tourism employment

This paper examines the relationship between migrants’ social networks, the processes of language acquisition and tourism employment. Data collected using netnography and interviews are used to identify the strategies that Polish workers in the UK use to develop their language skills. The paper highlights the roles played by co-workers, co-nationals and customers in migrants’ language learning, both in the physical spaces of work and the virtual spaces of internet forums. It also shows how migrant workers exchange knowledge about the use of English during different stages of their migration careers: prior to leaving their country of origin and getting a job, during their employment and after leaving their job. Implications for academic inquiry and human resource management practice are outlined.