Intelligent transportation system （ITS） is proposed as the most effective way to improve road safety and traffic efficiency. However, the future of ITS for large scale transportation infrastructures deployment highl...Intelligent transportation system （ITS） is proposed as the most effective way to improve road safety and traffic efficiency. However, the future of ITS for large scale transportation infrastructures deployment highly depends on the security level of vehicular communication systems （VCS）. Security applications in VCS are fulfilled through secured group broadcast. Therefore, secure key management schemes are considered as a critical research topic for network security. In this paper, we propose a framework for providing secure key management within heterogeneous network. The seeurity managers （SMs） play a key role in the framework by retrieving the vehicle departnre infi^rmation, encapsulating block to transport keys and then executing rekeying to vehicles within the same security domain. The first part of this framework is a novel Group Key Management （GKM） scheme basing on leaving probability （LP） of vehicles to depart current VCS region. Vehicle＇s LP factor is introduced into GKM scheme to achieve a more effieient rekeying scheme and less rekeying costs. The second component of the framework using the blockchain concept to simplify the distributed key management in heterogeneous VCS domains. Extensive simulations and analysis are provided to show the effectiveness and effieiency of the proposed framework： Our GKM results demonstrate that probability-based BR reduees rekeying eost compared to the benchmark scheme, while the blockchain deereases the time eost of key transmission over heterogeneous net-works.展开更多
The corporate governance of Chinese state-controlled listed companies （SCLCs） has attracted much scholarly attention. Through reviewing the extant literature in this field, it is clear that the overwhelming majority...The corporate governance of Chinese state-controlled listed companies （SCLCs） has attracted much scholarly attention. Through reviewing the extant literature in this field, it is clear that the overwhelming majority is theoretically underpinned by the lens of agency costs. Another important perspective, adaptive efficiency, has yet to be equally emphasized by scholars. Reflecting on the experience of American venture capital （VC）, this article puts forth that the corporate governance of SCLCs has weakened the fundraising ability of Chinese domestic VC. Taking account of the positive link of a vibrant VC sector and the enhancement of adaptive efficiency, an obvious conclusion is that the corporate governance of SCLCs has already jeopardized the adaptive efficiency of the Chinese economy. Further, the normative implication of this finding is that the refined art of reforming the corporate governance of SCLCs ought to combine and harmonize agency costs with adaptive efficiency.展开更多
文摘Intelligent transportation system （ITS） is proposed as the most effective way to improve road safety and traffic efficiency. However, the future of ITS for large scale transportation infrastructures deployment highly depends on the security level of vehicular communication systems （VCS）. Security applications in VCS are fulfilled through secured group broadcast. Therefore, secure key management schemes are considered as a critical research topic for network security. In this paper, we propose a framework for providing secure key management within heterogeneous network. The seeurity managers （SMs） play a key role in the framework by retrieving the vehicle departnre infi^rmation, encapsulating block to transport keys and then executing rekeying to vehicles within the same security domain. The first part of this framework is a novel Group Key Management （GKM） scheme basing on leaving probability （LP） of vehicles to depart current VCS region. Vehicle＇s LP factor is introduced into GKM scheme to achieve a more effieient rekeying scheme and less rekeying costs. The second component of the framework using the blockchain concept to simplify the distributed key management in heterogeneous VCS domains. Extensive simulations and analysis are provided to show the effectiveness and effieiency of the proposed framework： Our GKM results demonstrate that probability-based BR reduees rekeying eost compared to the benchmark scheme, while the blockchain deereases the time eost of key transmission over heterogeneous net-works.
文摘The corporate governance of Chinese state-controlled listed companies （SCLCs） has attracted much scholarly attention. Through reviewing the extant literature in this field, it is clear that the overwhelming majority is theoretically underpinned by the lens of agency costs. Another important perspective, adaptive efficiency, has yet to be equally emphasized by scholars. Reflecting on the experience of American venture capital （VC）, this article puts forth that the corporate governance of SCLCs has weakened the fundraising ability of Chinese domestic VC. Taking account of the positive link of a vibrant VC sector and the enhancement of adaptive efficiency, an obvious conclusion is that the corporate governance of SCLCs has already jeopardized the adaptive efficiency of the Chinese economy. Further, the normative implication of this finding is that the refined art of reforming the corporate governance of SCLCs ought to combine and harmonize agency costs with adaptive efficiency.
