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排序方式： 共有74条查询结果，搜索用时 15 毫秒
1.
David Matesanz Gomez Hernan J. Ferrari Benno Torgler Guillermo J. Ortega 《Applied economics》2017,49(10):972-986
In this article, we use a correlation matrix and its internal networks to analyse business cycle synchronization across Europe since 2000. This methodology allows us to summarize individual country interactions and co-movements while also capturing the existing heterogeneity of connectivity within the European economic system. Our results indicate that synchronization of the euro zone countries remained stable from 1999 until the current financial crisis, after which co-movements increased sharply and synchronization rose to the highest in the time sample. By endogenously identifying clusters of countries with close connections in their business cycle, we also refute the commonly accepted notion of identifiable core and peripheral euro zone countries. 相似文献
2.
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. 相似文献
4.
David Matesanz Benno Torgler Germán Dabat Guillermo J. Ortega 《Agricultural Economics》2014,45(Z1):13-21
This article analyses co‐movements in a wide group of commodity prices during the time period 1992–2010. Our methodological approach is based on the correlation matrix and the networks inside. Through this approach we are able to summarize global interaction and interdependence, capturing the existing heterogeneity in the degrees of synchronization between commodity prices. Our results produce two main findings: (a) we do not observe a persistent increase in the degree of co‐movement of the commodity prices in our time sample, however from mid‐2008 to the end of 2009 co‐movements almost doubled when compared with the average correlation; (b) we observe three groups of commodities which have exhibited similar price dynamics (metals, oil and grains, and oilseeds) and which have increased their degree of co‐movement during the sampled period. 相似文献
5.
约园是常州四大名园之一,是探讨清代中期常州典型文人园林的重要实例。以园主赵起所著《约园词稿》及赵景崇绘《约园图》为蓝本,挖掘清代赵氏约园“二十四景”历史源流,采用实地勘察与图文互证的方法,推导约园“二十四景”空间关系拓扑图,进而循证绘制出赵氏约园平面猜想图。总结归纳出赵氏约园“岛山绕水、南山涌翠”“建筑布陈、园中观园”“池石立峰、山水观游”的整体布局特征。深入考析了“东郊塔影”“城角风帆”“隔院钟声”“柳岸闻莺”“小亭玩月”等景象的观赏时机、位置及理景逻辑,以期逼近赵氏约园蔚然可观的园林盛况。从小园林到大社会,约园“二十四景”的复原考证研究是对清代中期园林文化意象的窥视,可为后续地域性文人山水园的保护性研究提供参考。 相似文献
6.
基于复杂网络理论的电动汽车充电设施布局合理性研究 总被引：1，自引：0，他引：1
提出了一种基于复杂网络理论构建电动汽车充电设施网络的模型,分别构建了上海、西安、合肥和大连的电动汽车充电设施网络,并分析了其电动汽车充电设施的运营情况以及布局的合理性。通过构建理想情况下的电动汽车充电设施网络,研究电动汽车充电设施网络的发展趋势。仿真结果显示:电动汽车充电设施网络的结构对电动汽车充电设施的利用率和稳定性有显著影响——该研究结果在实际网络中得到了验证。 相似文献
7.
无人移动平台无线ad hoc网络在实际应用中经常会出现由于电磁环境、干扰等因素导致通信质量不稳定的情况,在上述条件下传统的基于节点覆盖度的最小主控集（MCS）生成算法难以获得具有较好稳定性、健壮性的最小主控集。为此,提出了一种考虑通信质量的网络最小主控集生成算法,将链路的通信质量纳入网络最小主控集构造的考虑因素,使网络拓扑与链路通信质量特性保持一致;并通过对候选节点集及拟覆盖节点集的压缩,有效控制了网络最小主控集的节点数目。仿真表明,对敏感于通信质量的应用,该算法较基于节点覆盖度算法能取得更好效果。 相似文献
8.
阐释了3位知名瑞士风景园林师——基纳斯特(1945—1998)、德贡布(1939—)和沃格特(1957—)的作品,并论及他们如何受到了奥地利作家汉德克(1942—)的现象美学影响。3位风景园林师均致力于通过形式的塑造来揭示景观体验;而空间中的运动是上述1位作家和3位风景园林师作品共同的核心主题,此外,他们还极为关注城市空间的边缘地带。从城区行走到城外、在城市与自然间穿梭往返,是汉德克作品中反复出现的主题。正因如此,汉德克探寻到了一种与其诗意理想相呼应的景观的“易读性”(legibility)和“可体验性”(experienceability),这也使他在2019年被授予了诺贝尔文学奖。讨论了3位风景园林师的设计方法和场地实践,并将他们作品的核心归纳为——身处场地、寻找形式、通过设计干预赋予景观清晰性和可体验性。 相似文献
9.
John Allen Allan Cochrane 《International journal of urban and regional research》2014,38(5):1609-1624
Global events such as London's 2012 Olympic Games raise questions about the ways in which embedded political arrangements take their shape from relationships that stretch across and beyond urban boundaries. In this article, the urban politics that we wish to capture is not one that is merely located in the city, but rather one that has to constantly take into account the mediated demands folded (as it were) into the urban arena. In the first part of the article, the corporate politics of an Olympic‐related urban regeneration are outlined and then considered, first as a staged setting for interaction, a kind of placeless political engagement, and then as a more embedded spatial politics that takes into account the leverage of networked groups acting within and beyond the city. Following that, we explore the politics of regeneration when campaign groups and alternative coalitions of interest raise their own political demands by drawing on references outside of their immediate urban area and attempt to steer political dialogue in ways that extend the reach of urban politics. The urban politics at stake in this context, we argue, appears to work more through topology than a series of mapped connections; through actors registering their presence in ways that often dissolve the tension between inside and outside rather than define it in terms of separate political spaces. 相似文献
10.
基于校园一卡通消费的公共机房应确保数据安全,使用QuickDesktop系统可有效解决问题,但网络拓扑将影响实施效果,本文分析了组网过程中网络拓扑故障的原因,提出了解决办法。 相似文献