基于分形方法的城市路网交通形态分析

城市路网交通形态的合理与否是关系到城市交通顺畅与否的基础性要素.运用分形理论及其方法,针对路网覆盖性与连通性,分别建立相应的分形模型,进而通过探讨模型分形意义下的维数,达到分析城市路网交通形态的目的.最后,通过对某城市局部路网的实例分析,验证了将分形方法引入城市路网交通形态分析的可行性.     

区域景观格局视角的绿地生态网络优化研究——以徐州为例

[目的]基于景观格局演变的区域绿地生态网络与生态功能优化研究是景观生态学研究的热点领域之一。[方法]文章以徐州示范为例,在城市研究区景观格局演变及其异质性研究分析基础上,探索城市规划区城乡绿地景观格局的优化路径;运用经济学与生态学原理,按“山水林田湖草”一体化理念,以区域生态系统服务优化及人与自然和谐发展为前提,从市域与城市规划区视角,合理配置城乡绿地生态网络景观组分,进而优化区域绿地生态网络。[结果]研究得出2005—2015年研究范围城市化造成大量耕地消失,城市建设用地快速增加,随着生态园林建设的快速推进,林地面积占比大幅度增加;地表覆被变化直接表现为景观格局的快速破碎化和景观多样性的下降,景观类型的丰富度和复杂度急需提高,景观多样性指数、景观均匀度指数也均呈现较为明显的下降趋势。同时,重点提出了强化景观格局与过程的完整性与连通性,挖掘潜在生态功能等的区域绿地生态网络一系列优化方案。[结论]文章为研究区及延伸的城乡区域绿地生态网络构建和生态系统服务优化提供了科学的依据、方法与途径。     

基础设施互联互通对出口经济体参与全球价值链的影响

本文利用亚洲开发银行（ADB)提供的贸易增加值分解数据构建出口经济体的全球价值链参与程度模型，实证检验各经济体间基础设施互联互通水平对各经济体参与全球价值链的影响。实证结果发现：基础设施互联互通水平促进了出口经济体在全球价值链中的前向垂直专业化参与率以及垂直专业化深度。贸易双方之间的技术差距、制度质量差距等因素会影响物流质量、双边联通变量对全球价值链参与程度的边际影响。技术差距、制度质量差距的增加会降低物流质量对出口经济体在全球价值链中前向垂直专业化参与率的促进作用，但会提高双边联通对出口经济体在全球价值链中前向垂直专业化参与率的促进作用。而技术差距、制度质量差距的变化对物流质量、双边联通对出口经济体在全球价值链中垂直专业化深度的促进作用没有影响。     

Factors influencing the hub connectivity of Beijing Capital Airport in its international markets

This paper investigates factors influencing the hub connectivity of Beijing Capital Airport (PEK) in its domestic to international markets between 2014 and 2018 based on a random-effect panel data model. The results show that variables representing the temporal and spatial characteristics of connecting flights have significant impacts on the hub connectivity of PEK. In specific, the changeable threshold of maximum connecting time based on different international destination regions has a negative impact. This paper identifies different timetable coordination modes at PEK and shows that the number of indirect connections under adjacent mode is significantly less than that of distant mode. Circuity and directionality are proven to have significant impacts. In addition, factors representing airport characteristics and heterogeneity of international destination regions also affecting the hub connectivity of PEK.     

Ecological networks: Are they enough for connectivity conservation? A case study in the Barcelona Metropolitan Region (NE Spain)

This paper extends the debate on corridor effectiveness at regional planning scale, by exploring the contribution to landscape connectivity of a proposed ecological network and the remaining non-urbanized matrix in the Barcelona Metropolitan Region (BMR). Using the Ecological Connectivity Index, we evaluated the expected connectivity loss after the development of the approved urban plans in the region. Thus, we compared the baseline (present-day) and the projected (after planned urban development) connectivity scenarios for total, forest and agricultural habitats. Then, we estimated the mitigation in connectivity loss when successively removing from plans those development sectors included in protected sites, first order corridors, and second-order corridors of the ecological network, and in the rest of land matrix. Estimations were done for all the BMR and for inside versus outside the set of sites currently protected.The ecological network and the rest of matrix contributed equally to mitigating the expected connectivity loss, but while the former was more effective for forest habitats, the latter was especially constructive for croplands. This was due to a heterogeneous distribution of habitats, protected reserves and urban development areas. Still, connectivity preservation within protected sites appeared to be highly dependent on what is going on outside the ecological network, as we observed in particular for agricultural habitats. This result extends at regional scale the statement that no park is an island, but is highly affected by the land use and land cover dynamics of its surroundings.     

北京和首尔全球城市网络联系能级及其动力因素比较

在全球城市网络中,每个城市的网络联系能级各不相同。目前的研究主要描述了网络特征和联系方式,以及联系程度的衡量方法,还缺少对影响网络联系动力因素的深入探索。在泰勒所建立的城市—公司数量矩阵基础上,通过对全球61个跨国现代服务业企业在49个城市的分布,计算各城市的联系度,分别将北京和首尔在全球城市网络中的联系度及其不同部门的差异进行比较;并对决定两个城市联系能级的产业、城市和国家经济等相关因素进行比对,证明产业、城市和国家等不同层次因素对全球网络城市联系度的影响。结果表明,国家腹地对城市在网络中的地位比城市和行业因素的动力作用都更加明显。这不但验证了泰勒提出的城市联系能级动力因素,而且对不同层次的动力因素得出了具体结论。     

Port connectivity in a logistic network: The case of Bohai Bay,China

While traditional port literature uses origin and destination pairs in global shipping networks, recent developments of dry ports in the hinterland, feeder service networks, and heavy foreign trade traffic make the ports in Bohai Bay a unique case in the analysis of inter-port connectivity and competitiveness. Using an integrated port connectivity index to define the above features, the advantages and challenges of individual ports can be assessed in a dynamic interconnected environment. The model can provide unbiased port development strategies for each port to ensure long-term sustainability.     

New regional aviation policy in India: Early indicators and lessons learnt

In this article, we study the new regional aviation policy of India along with data collected on the performance of the scheme since its introduction in 2016. The scheme has multiple objectives. First, it wants to increase footprints of civil aviation to unserved and underserved airports of India. Second, it intends to make flying more affordable. It comes out, the aviation market in the country has expanded due to the addition of new routes under the scheme but data indicates that there is a regional imbalance in the performance of the scheme. Moreover, there are still questions on the long term sustainability of many routes and finding a solution for neglect of some priority regions. We have identified economic and commercial challenges that need to be addressed for the program to achieve its goals. The insights gathered during the study can be generalized and policy makers and managers of remote area air-connectivity schemes of different countries should find them useful.     

Code-share connectivity within global airline alliances – How much potential is utilized?

This paper analyzes the code-share connectivity of carriers from the three global alliances: Star Alliance, Sky Team and oneworld. We generate 2-leg online and code-share connections to evaluate the existing connectivity. Additionally, we generate all potential interline connections between members of the same alliance that are not yet supported with existing code-shares and analyze what share of the potential connectivity remains unused. We find that code-share connections account to about one-fourth of the total number of international connections offered by alliance members. 73% of those code-share connections are with partners from the same alliance, 6% with carriers from competing alliances and the rest with other carriers, which means that airlines seek partnerships not only within their own global alliance but even with members of competing alliances. At the same time, over 25% of the total potential code-share connections between members of the same alliance remain unused. This connectivity potential is better utilized within the network of Sky Team and oneworld than within Star Alliance. American and European carriers show a higher degree of code-share partnership with their alliance partners than Asian carriers. Overall, code-share partnerships are strongly driven by strategic decisions on bilateral airline level. Many airline-pairs fully utilize their connectivity potential (almost half of the total existing code-share connections) but some cooperate only on selected routes or not at all. Over one-third of the remaining code-share connectivity potential within alliances is attributed to airline-pairs that don't partner at all.     

Chatbots or me? Consumers’ switching between human agents and conversational agents

With the application of artificial intelligence (AI) technology in organizational frontlines, customers' service experiences have begun to shift from interactions with service personnel to those with technology. However, only a few studies have explored customers' behavioral switch from human-mediated services to technology-mediated ones with regard to the application of AI in frontline services. Based on the push–pull mooring framework, this study explored the determinants that affect consumers’ behavioral switch from using human agents to using AI-based conversational agents. Data collected from 441 users of banking services were analyzed using structural equation modeling. The findings reveal that both push effects—namely, low empathy and low adaptability—and pull effects, including anytime/anywhere connectivity, association, visibility, and personalization, have positive influences on switching behavior. Finally, in addition to having a direct influence on switching behavior, frequency of service use positively moderated the relationship between pull effects and switching behavior.