云南省团队游空间结构及其聚散效应研究

在旅游业高质量快速发展的背景下,全面厘清与掌握省域尺度范围各旅游节点在网络中的角色和地位,并解析其网络结构效应具有重大意义。针对现有研究因旅游流数据采集限制而较少对团队游空间结构研究的不足,基于云南省旅游包车客运信息,运用社会网络结合空间分析的方法,提取了云南省团队游网络空间结构特征,并对其聚散效应进行分析。结果表明:云南省团队游整体网络密度较小且淡旺季表现出相似特征,网络对各节点的旅游联系与合作影响尚未显现,暴露出云南省团队游旅游市场发展的不均衡;团队游网络外向中心势显著高于内向中心势,网络空间集聚趋势明显;通常具有较强外向中心性的旅游节点同时也具有较强内向中心性,表现出“集中—发散”的聚散规律;旅游节点的聚散效应表现为单个节点以圈层状向外递减形式发生,其扩散路径主要集中于文山—蒙自、景洪—思茅方向。整体上,云南省区域旅游业发展差异明显,应重点加强滇西南与滇西旅游区、滇中与滇东北旅游区的旅游资源开发与合作。     

Determining the integrated volatility via limit order books with multiple records

The integrated volatility plays an important role in risk management and portfolio selection, the estimation methods regarding the quantity have been widely investigated, either under low-frequency data or high-frequency data, or a combination of both. In this paper, we propose a measure for the integrated volatility via limit order book data with possible presence of multiple records. The estimator is valid under mild conditions and it is easily implemented. The finite sample performance of the proposed estimator has been verified by simulation studies and we apply the method to some real high-frequency data-sets as well.     

A genetic algorithm based approach to transactional and QoS-aware service selection

As there are various risks of failure when Web services are deployed in unreliable environment, the execution of a composite Web service (CWS) requires the transaction mechanism to guarantee its reliable execution. However, the existing service selection approaches consider QoS and transaction separately and have not considered that transactional properties may affect the QoS such as the execution time of a CWS. This work addresses the importance of considering transactional properties and how the transactional properties affect the QoS simultaneously in the process of service selection by a QoS-aware and transactional-aware selection approach. First, a performance evaluation method is proposed to calculate the execution time of a transactional CWS. Then, a genetic algorithm based approach, which takes into account the execution time, price, transactional property and successful execution rate of CWS, is presented to achieve global optimisation service selection. Finally, experimental results show the efficiency and effectiveness of the approach.     

Financial investor sentiment and the boom/bust in oil prices during 2003–2008

From both theoretical and policy perspectives, it is important to understand if financial speculation contributes to the boom/bust in oil prices during 2003–2008. In this paper, we disentangle the effects of financial speculation from those of economic fundamentals by focusing on exogenous changes of financial speculation in oil markets identified by changes in financial investor sentiment. Furthermore, we focus on a quasi-experiment setting, and investigate both sentiment-driven overvaluation of oil prices and subsequent mispricing correction. Our findings suggest that financial speculation might have contributed to the 2003–2008 boom/bust in oil prices.     

现代信息服务业发展模式的比较与选择——基于广东省的数据分析

比较要素导向型、投资导向型和创新导向型三种现代信息服务业的发展模式,分析广东省现代信息服务业的发展现状,提出广东省现代信息服务业选择创新导向型发展模式的具体对策。     

燃气管道防雷设计的基本原则和方法

本文首先分析了燃气管道可能遭受雷击的主要通道,然后提出了堵塞这些主要危害通道的基本思路和基本技术要求,并对燃气管道防雷设计的基本原则和方法作了详尽的论述,为燃气管道的防雷设计提供了实践依据。     

最优能源强度与我国经济增长

本文通过一个内生增长模型对能源消费与经济增长的关系进行了分析,证实存在使经济增长率最大化的最优能源强度,并且最优能源强度与能源价格反方向变动.在此基础上,估计了近年来我国的最优能源强度,并测算了实际能源强度与最优值的差距.结果表明,近年来我国实际能源强度高于最优值达3万吨标准煤/亿元以上,且有不断上升的趋势.最后提出了在保持最优能源强度的前提下降低能源消耗的政策建议.     

财产性收入的战略解读

<正>党的十七大报告中首次提出:"创造条件让更多群众拥有财产性收入"。笔者认为这个提法是十七大报告中最重要的观点之一,将对中国构建更加殷实的小康社会和和谐社会产生重大影响。可以从四个层面对"创造条件让更多群众拥有财产性收入"的观点做出战略性的解读:     

普惠保险发展的路径选择及其优化——基于小额保险的国际经验

保险“十三五”规划要求大力发展小额保险等普惠保险,但我国小额保险发展相对滞后,制约着普惠保险的全面发展。本文基于对印度等五国经营小额保险的经验研究,比照我国普惠保险发展实际情况,期望借此破解我国普惠保险发展困局,优化普惠保险发展路径。研究发现:我国普惠保险发展在政府推动力度、法律法规完善程度、政策支持力度及发展模式上均可进一步强化改善。结合国际经验和中国实践,我国普惠保险发展应重视法律法规等正式制度建设,顺应各地风俗文化等非正式制度,出台“小额保险条例”作为普惠保险的配套支持政策,利用合作代理销售模式和科技创新手段,控制普惠保险交易成本,开发符合消费者实际利益的普惠保险险种。     

家族控制与企业债务融资：基于我国上市公司的实证分析

以2017年1647家上市家族企业为研究对象,从企业控制人持有公司控制权比例对上市家族企业债务融资的影响切入,引入债务代理成本,运用中介效应模型,分析家族控制对企业债务融资变动的解释能力。研究发现家族企业家族控制水平对于上市家族企业债务融资具有负面影响,家族控制权的提高会提升企业的债务代理成本,而债务代理成本对家族控制权与企业债务融资的关系具有完全中介效应。