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研究技术创新网络多维邻近性是否伴随创新网络生命周期不同发展阶段而呈现出不同演化特征,对创新网络内部伙伴选择、关系治理和创新绩效发展具有重要意义。基于IBM专利合作网络数据,运用Feature Selection方法,从地理邻近、社会邻近、技术邻近、组织邻近和制度邻近5个维度分析技术创新网络多维邻近性演化特征。结果表明:①生命周期视角下,在创新网络创生阶段,企业选择合作伙伴时主要考虑技术邻近性和组织邻近性,成长阶段主要考虑地理邻近性,成熟和衰退阶段主要考虑社会邻近性;②演化视角下,地理邻近性与技术邻近性曲线呈倒U型关系,地理邻近性在成长期达到最高点,技术邻近性在成熟期达到最高点;制度邻近性与组织邻近性呈U型关系,制度邻近性在成长期达到最低点,组织邻近性在成熟期达到最低点;社会邻近性则随着创新网络生命周期发展一直呈上升态势。 相似文献
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The abstract representation of a transportation system as a network of nodes and interconnecting links, whether that system involves roadways, railways, sea links, airspace, or intermodal combinations, defines a network topology. Among the most common in the context of transportation systems are the grid, ring, hub-and-spoke, complete, scale-free and small-world networks. This paper investigates the role of network topology, and the topology’s characteristics, in a transportation system’s ability to cope with disaster. Specifically, the paper hypothesizes that the topological attributes of a transportation system significantly affect its resilience to disaster events. Resilience accounts for not only the innate ability of the system to absorb externally induced changes, but also cost-effective and efficient, adaptive actions that can be taken to preserve or restore performance post-event. Comprehensive and systematically designed numerical experiments were conducted on 17 network structures with some relation to transportation system layout. Resilience of these network structures in terms of throughput, connectivity or compactness was quantified. Resilience is considered with and without the benefits of preparedness and recovery actions. The impact of component-level damage on system resilience is also investigated. A comprehensive, systematic analysis of results from these experiments provides a basis for the characterization of highly resilient network topologies and conversely identification of network attributes that might lead to poorly performing systems. 相似文献
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Without sustainable competitive advantage firms have limited economic reasons to exist and will decline. Competitive advantage concerns the factors which provide competitive strength. This paper is based upon the resource-based view which considers firm resources to be heterogeneous and which believes that firms only have a small bundle of core resources irrespective of their overall performance. This research establishes the role of 36 intangible resources for 49 Asian airlines across three business models: network airlines; low-cost subsidiaries from network airlines; and low-cost carriers. It uses the VRIN framework which examines whether resources are valuable, rare, inimitable, and non-substitutable. Research participants distribute points between their chosen seven resources according to their perceived role in firm performance. Resources which meet all four requirements of VRIN are considered core competences and sources of sustained advantage. Across all 49 Asian airlines, the top-three most important resources of advantage are slots, brand, and product/service reputation. While these core resources are predictable, they have not previously been proven within the context of airlines, let alone geographically and by airline model. Results show that the core bundle of resources vary for each model, which helps to explain the difference in performance across models, and that some resources which were expected to be high-ranking, such as organisational culture and customer focus, were not. 相似文献
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In this paper we propose an improved mathematical model for locating EV charging stations. We consider the successive activities of the travelers, i.e., a person with two main stops during the day should charge the vehicle in just one of the parking spots, hence avoiding double counting the demand. The model is tested for the city of Coimbra (Portugal), where there is a network of nine stations. We conclude that our solution is better than the one that was implemented in reality, moreover we are able to conclude that demand transference has a rather significant impact on the solutions. 相似文献
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《Contaduría y Administración》2015,60(2):291-325
We elaborate some complex stylized facts related to the Mexican economy. The analyzed period runs from 1960 to 2013 with selected subperiods. Our main findings are: 1) there are involuntary idle capacities in the manufacturing industries; 2) the growth of the Mexican economy is not balanced but unbalanced; 3) there is an inflation-free environment. This fact is consistent with the previous ones; 4) there is a mixed of efficient and inefficient sequences of investment; 5) the stimulus of manufacturing exports on macroeconomic performance has been offset by its imports; 6) the deficits in manufacturing balance and in the current account have been financed without difficulty. Of course, this financing capacity constitutes a second best condition; 7) according to a backward linkages analysis, the towing capacity of manufacturing sector over the Mexican economy would be a larger one if the manufacturing imports penetration had not been so intense since the trade liberalization; and 8) the size of the positive effect of the manufacturing sector on the economy and on the non-manufacturing sectors diminished since the early eighties. Our complex stylized facts highlight the need for an upgrading of the current economic policies. 相似文献
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