A note on shared transportation for tourists with special reference to the Israeli sherut

In this note, we provide answers to two hitherto unstudied questions in the literature concerning the provision of shared transportation to tourists. First, we ascertain the long run fraction of time that there is no sherut taxi at a designated taxi stand. Second, we determine the long run fraction of tourists who are lost to the sherut taxi providing firm because no taxis are available when arriving tourists want a taxi. Finally, we show that these two long run fractions are equal because the so called PASTA property holds in our model. Copyright © 2009 John Wiley & Sons, Ltd.     

基于SDN和MEC的5G VANET架构及其性能分析

为了在大规模的车载自组织网络（Vehicular Ad-hoc Network,VANET）中提供灵活的网络管理、控制和提高资源利用率,结合软件定义网络（Software Defined Network,SDN）、云无线接入网络（Cloud Radio Access Network,C-RAN）和移动边缘计算（Mobile Edge Computing,MEC）,提出了一种分层的5G VANET架构（5G MEC VANET）,能够支持智能交通系统各种功能和应用的动态特性,同时降低网络管理成本。此外,位于网络边缘的MEC框架避免了车辆与路边基站的频繁交互,减少了数据传播延时。仿真结果表明,与传统VANET和5G VANET架构相比,所提出的架构降低了传播时延,提高了网络带宽吞吐量,同时减少了控制器开销。     

微型金融资金配置绩效研究进展

微型金融作为一种金融发展服务形式有效创新,其追求实现社会扶贫和自身可持续发展双赢目标的特殊性,使得对微型金融资金配置绩效最新研究进行梳理具有一定现实意义。本文通过对MFIs绩效测量指标、资金结构、配置绩效状况、影响因素和有效途径进行梳理后认为：要提高微型金融资金配置绩效,就必须不断拓展MFIs融资渠道,推进金融服务基础设施建设,破除现有政策方面机制隐形障碍,在内外部共同努力下实现双赢目标。     

Optimizing the aerodynamic efficiency of intermodal freight trains

We develop an aerodynamic loading assignment model for intermodal freight trains based on an integer-programming framework to help terminal managers make up more fuel-efficient trains. This is the first use of optimization modeling to address the aerodynamics and energy efficiency of railroad intermodal trains. Several recommendations regarding railway equipment use, operations, and policy are proposed to improve fuel-efficiency and reduce emissions from intermodal transportation. Analysis of one major railroad intermodal route reveals the potential to reduce fuel consumption by 15 million gallons per year with corresponding savings of $28,000,000. Greater benefits are possible through broader implementation of the model.     

Evolution of the slow living concept within the models of sustainable communities

The study presents analysis of three case studies of sustainable communities to reveal their distinctive features through the novel Functional Models of Sustainable Communities framework. The case studies signify phases of evolution of the slow living concept starting from the traditional representation (Model A), through the hybrid (Model B), to a more contemporary model (Model C). Based on the novel SLOW LIFE analysis, the study found that contrary to expectations the latest high-tech model of sustainable community in Masdar City failed to generate the same level of social cohesion and enjoyable living experience as evidenced in older, more established communities (Damanhur, and Toarps Ekoby). The study highlights the pivotal role of slow living concepts in the transitional period of the 21st century, moving towards the next ideational phase, according to Sorokin’s pendulum theory of social change. Further, the T-Cycle analysis revealed a converging trend in the shifting dialectical relationship between mainstream Western society and sustainable communities. The findings of this study indicate that evolution of the slow living concept in the context of sustainable communities followed broader trends in society—moving towards a more technologically oriented model.     

中国运输服务贸易国际竞争力测度与比较——基于EBOPS统计的分析

文章基于EBOPS统计的进出口数据对我国运输服务贸易及各分类项目的国际市场占有率指标和贸易专业化指数进行了测度和国际比较。分析表明,我国运输服务贸易的竞争劣势主要来自于海运货运的劣势,我国在海运客运和其他运输项目上还具有一定比较优势。劣势的原因主要源于我国货物贸易增速过快、海运市场开放度高、船舶运力不足及船队结构不合理。     

风电设备运输甲板驳船的靠泊方案设计分析

总结在海上风场建设过程中运输甲板驳船在安装机位点进行风电机组设备过驳吊装过程中3种锚泊方案,并通过数值分析方法仿真模拟运输甲板驳船的运动响应和锚泊系统系泊力情况,对比分析3种锚泊方式的优劣和适用范围,为海上风机吊装制定合理的运输驳船的靠泊方案提供参考依据。     

危机冲击与家族企业海外投资——来自中国香港上市公司的数据分析

社会情感财富理论提出后,许多学者在分析家族企业风险性决策时大多都是以社会情感财富这个单一的非经济目标作为决策依据,而忽略了经济目标在风险性决策模型中的重要性。文章针对这种单一决策目标的模型,基于企业经营的时间维度与目标类型构建了一个同时考虑到社会情感财富与经济目标的家族企业决策框架。基于2001-2016年中国香港本地制造业公司数据,文章重点考察了2003年发生的局部跨域SARS危机与2008年发生的全球金融危机对家族企业海外资产投资决策可能产生的影响,检验结果表明:与非家族企业相比,家族企业进行海外资产投资的动力往往更低。另外,不同的外部危机将对家族企业的海外资产投资产生显著的差异化影响。SARS危机冲击弱化了家族控制与海外投资的负向关系,即局部跨域危机来临时,家族企业为了持续发展将会加大其海外资产投资以获得潜在的风险性收益;全球性金融危机冲击则强化了家族控制与海外投资之间的负向关系,即全球性金融危机来临时,家族企业为了生存将会缩小其海外资产投资规模。文章的进一步研究还发现,虽然家族企业的海外投资对企业绩效具有负向影响,但局部跨域危机情境下的家族海外投资却显著改善了企业绩效,全球性金融危机冲击下的海外投资则更加恶化了企业绩效。     

宁波市利用外资负效果与可持续发展

新世纪宁波经济已进入一个新的发展阶段,改革开放26年来,宁波利用外资的数额不断增加。利用外资在带来积极效应的同时也带来一定的负面效应。本文根据利用外资和可持续发展有关理论对宁波利用外资的负效果进行了分析,并对新世纪利用外资提出了相应的对策。     

基于信任的社会资本与民营企业可持续发展

20世纪90年代以来,社会资本成为企业发展的重要话题。它不但成为解释企业持续发展的理论,也被奉为探求组织发展的有效方法。信任是社会资本的重要内容。信任资源不足是我国民营企业成长的瓶颈。本文通过对我国民营企业中信任型社会资本的现状分析,提出民营企业应加强信任型社会资本的挖掘和建设,以促进我国民营企业可持续成长。