The tremendous performance gain of heterogeneous networks(Het Nets) is at the cost of complicated resource allocation. Considering information security, the resource allocation for Het Nets becomes much more challengi...The tremendous performance gain of heterogeneous networks(Het Nets) is at the cost of complicated resource allocation. Considering information security, the resource allocation for Het Nets becomes much more challenging and this is the focus of this paper. In this paper, the eavesdropper is hidden from the macro base stations. To relax the unpractical assumption on the channel state information on eavesdropper, a localization based algorithm is first given. Then a joint resource allocation algorithm is proposed in our work, which simultaneously considers physical layer security, cross-tier interference and joint optimization of power and subcarriers under fairness requirements. It is revealed in our work that the considered optimization problem can be efficiently solved relying on convex optimization theory and the Lagrangian dual decomposition method is exploited to solve the considered problem effectively. Moreover, in each iteration the closed-form optimal resource allocation solutions can be obtained based on the Karush-Kuhn-Tucker(KKT) conditions. Finally, the simulation results are given to show the performance advantages of the proposed algorithm.展开更多
Using a New Economic Geography OVEG) model, this paper investigates the effect of market potential, natural resource endowment and tax burden on the location distribution of industrial enterprises in China. By applyi...Using a New Economic Geography OVEG) model, this paper investigates the effect of market potential, natural resource endowment and tax burden on the location distribution of industrial enterprises in China. By applying data from 2000 to 2010 of 286 Chinese cities, this paper conducts an empirical analysis on the location of industrial enterprises of different time periods, regions and ownership systems. The results indicate that greater domestic market potential and international market demand are favorable to fostering or introduction of new enterprises. It also shows that coastal cities with better resource endowment are more attractive to corporate investment, while cities in interior regions have heavy and highly differentiated industrial tax burdens, which is unfavorable to the attraction of enterprises. In comparison, infrastructure and wage of cities have no obvious effect on enterprises' location choice. When it comes to enterprises of different ownership, domestic market potential and international market demand all have significant positive effects on the location distribution of foreign-funded enterprises, private enterprises and enterprises with investment from Hong Kong, Macao and Taiwan, while the level of urban industrial tax burden has an opposite effect. We find that the NEG model has a relatively strong explanatory power to the location of industrial enterprises in China.展开更多
Taking Chongzuo City of Guangxi Zhuang Autonomous Region as an example, the employment effect of the resource-abundant industrial cluster in southwestern Guangxi Province is analyzed according to the data from the Cho...Taking Chongzuo City of Guangxi Zhuang Autonomous Region as an example, the employment effect of the resource-abundant industrial cluster in southwestern Guangxi Province is analyzed according to the data from the Chongzuo Statistical Yearbook , Guangxi Statistical Yearbook from 2003 to 2008 and the data from the relevant sections of Chongzuo City, and the four employment effects of industrial cluster--the spatial expansion effect of employment chain, optimizing effect of employment structure, the multiplier effect of employment absorption and the effect of improving the quality of labors and the degree of the intensity of employment and location quotient of employment. Results show that the employment absorption of sugar industry in Chongzuo City is stable and upward slightly, and it shows strong employment effect; the sugar industry in Chongzuo is not only competitive, but also has a great share of market in employment, so it owns strong absorption of employment. The countermeasures for improving the employment level of resource-abundant and industrial cluster in southwest of Guangxi Province are put forward, including elongating industrial chain and widening employment space; strengthening various kinds of formal and informal training to improve the employment capability of laborers; laying stress on industrial structure and optimizing the employment structure; strengthening the construction of the industrial economic zone towards ASEAN(Association of Southeast Asian Nations), and fully displaying the regional advantages of the offshore border.展开更多
Firstly,agriculture,industry and tourism in the Yangtze River Delta,Pearl River Delta and Bohai Economic Rim were chosen to represent the primary,secondary and tertiary industries respectively,and industrial agglomera...Firstly,agriculture,industry and tourism in the Yangtze River Delta,Pearl River Delta and Bohai Economic Rim were chosen to represent the primary,secondary and tertiary industries respectively,and industrial agglomeration in the three economic zones was analyzed using location quotient coefficient method.Afterwards,the critical factors influencing industrial agglomeration were discussed using gray correlation analysis.The results showed that industrial agglomeration of agriculture,industry and tourism formed gradually in the three economic zones,and the critical factors influencing industrial agglomeration were human capital,science and technology progress,and natural resources.Meanwhile,environmental pollution affected and restricted the development of industrial agglomeration.展开更多
数据中心的高投入和低资源利用率一直是云服务提供商关注的问题.面对这个难题,直接的解决方案是在同等资源上混合部署更多的应用以提高资源使用效率.然而,由于混部应用对共享资源的竞争导致了应用间的性能干扰,从而影响了应用的性能、...数据中心的高投入和低资源利用率一直是云服务提供商关注的问题.面对这个难题,直接的解决方案是在同等资源上混合部署更多的应用以提高资源使用效率.然而,由于混部应用对共享资源的竞争导致了应用间的性能干扰,从而影响了应用的性能、服务质量(quality of service,QoS)和用户满意度,因此如何保障应用的性能已成为混部场景下的关键问题.着重从应用和集群特征分析(基础)、干扰检测(前提)、单节点资源分配(微观层面策略)和集群作业调度(宏观层面策略)4个方面阐述多应用混部性能保障的相关背景、挑战和关键技术.在不同的混部场景下,由于应用和集群特征等不同,性能保障工作所面临的挑战和问题复杂度也各异,例如单位资源上混合部署的应用数量会直接影响到搜索资源空间的时间开销,应用的运行方式会影响到共享资源的竞争强度.因此,从问题复杂度角度出发,从应用和集群特征、资源干扰维度和混部应用个数3个维度对相关研究工作面临的挑战进行讨论和分析.探讨了面向高密度混部场景应用性能保障方法的发展方向和挑战,认为全栈式的软硬件协同方法是保障高密度混部下应用性能的趋势,该方法有助于全面地提升应用性能的可靠性和数据中心的资源利用率.展开更多
基金supported by the National Natural Science Foundation of China under Grant No.61371075the 863 project SS2015AA011306
文摘The tremendous performance gain of heterogeneous networks(Het Nets) is at the cost of complicated resource allocation. Considering information security, the resource allocation for Het Nets becomes much more challenging and this is the focus of this paper. In this paper, the eavesdropper is hidden from the macro base stations. To relax the unpractical assumption on the channel state information on eavesdropper, a localization based algorithm is first given. Then a joint resource allocation algorithm is proposed in our work, which simultaneously considers physical layer security, cross-tier interference and joint optimization of power and subcarriers under fairness requirements. It is revealed in our work that the considered optimization problem can be efficiently solved relying on convex optimization theory and the Lagrangian dual decomposition method is exploited to solve the considered problem effectively. Moreover, in each iteration the closed-form optimal resource allocation solutions can be obtained based on the Karush-Kuhn-Tucker(KKT) conditions. Finally, the simulation results are given to show the performance advantages of the proposed algorithm.
文摘Using a New Economic Geography OVEG) model, this paper investigates the effect of market potential, natural resource endowment and tax burden on the location distribution of industrial enterprises in China. By applying data from 2000 to 2010 of 286 Chinese cities, this paper conducts an empirical analysis on the location of industrial enterprises of different time periods, regions and ownership systems. The results indicate that greater domestic market potential and international market demand are favorable to fostering or introduction of new enterprises. It also shows that coastal cities with better resource endowment are more attractive to corporate investment, while cities in interior regions have heavy and highly differentiated industrial tax burdens, which is unfavorable to the attraction of enterprises. In comparison, infrastructure and wage of cities have no obvious effect on enterprises' location choice. When it comes to enterprises of different ownership, domestic market potential and international market demand all have significant positive effects on the location distribution of foreign-funded enterprises, private enterprises and enterprises with investment from Hong Kong, Macao and Taiwan, while the level of urban industrial tax burden has an opposite effect. We find that the NEG model has a relatively strong explanatory power to the location of industrial enterprises in China.
基金Supported by Important Special Research Projects of Guilin University of Electronic Technology (UF09022y)Special Subjects of Guangxi Human Social Science Research Center (XWSKYB2010006)Natural Science Fund of Guangxi Normal University for Nationalities(XYYB2010006)
文摘Taking Chongzuo City of Guangxi Zhuang Autonomous Region as an example, the employment effect of the resource-abundant industrial cluster in southwestern Guangxi Province is analyzed according to the data from the Chongzuo Statistical Yearbook , Guangxi Statistical Yearbook from 2003 to 2008 and the data from the relevant sections of Chongzuo City, and the four employment effects of industrial cluster--the spatial expansion effect of employment chain, optimizing effect of employment structure, the multiplier effect of employment absorption and the effect of improving the quality of labors and the degree of the intensity of employment and location quotient of employment. Results show that the employment absorption of sugar industry in Chongzuo City is stable and upward slightly, and it shows strong employment effect; the sugar industry in Chongzuo is not only competitive, but also has a great share of market in employment, so it owns strong absorption of employment. The countermeasures for improving the employment level of resource-abundant and industrial cluster in southwest of Guangxi Province are put forward, including elongating industrial chain and widening employment space; strengthening various kinds of formal and informal training to improve the employment capability of laborers; laying stress on industrial structure and optimizing the employment structure; strengthening the construction of the industrial economic zone towards ASEAN(Association of Southeast Asian Nations), and fully displaying the regional advantages of the offshore border.
基金Supported by the Major Program of Humanities and Social Sciences,Ministry of Education of China(10JYC790312)
文摘Firstly,agriculture,industry and tourism in the Yangtze River Delta,Pearl River Delta and Bohai Economic Rim were chosen to represent the primary,secondary and tertiary industries respectively,and industrial agglomeration in the three economic zones was analyzed using location quotient coefficient method.Afterwards,the critical factors influencing industrial agglomeration were discussed using gray correlation analysis.The results showed that industrial agglomeration of agriculture,industry and tourism formed gradually in the three economic zones,and the critical factors influencing industrial agglomeration were human capital,science and technology progress,and natural resources.Meanwhile,environmental pollution affected and restricted the development of industrial agglomeration.
文摘数据中心的高投入和低资源利用率一直是云服务提供商关注的问题.面对这个难题,直接的解决方案是在同等资源上混合部署更多的应用以提高资源使用效率.然而,由于混部应用对共享资源的竞争导致了应用间的性能干扰,从而影响了应用的性能、服务质量(quality of service,QoS)和用户满意度,因此如何保障应用的性能已成为混部场景下的关键问题.着重从应用和集群特征分析(基础)、干扰检测(前提)、单节点资源分配(微观层面策略)和集群作业调度(宏观层面策略)4个方面阐述多应用混部性能保障的相关背景、挑战和关键技术.在不同的混部场景下,由于应用和集群特征等不同,性能保障工作所面临的挑战和问题复杂度也各异,例如单位资源上混合部署的应用数量会直接影响到搜索资源空间的时间开销,应用的运行方式会影响到共享资源的竞争强度.因此,从问题复杂度角度出发,从应用和集群特征、资源干扰维度和混部应用个数3个维度对相关研究工作面临的挑战进行讨论和分析.探讨了面向高密度混部场景应用性能保障方法的发展方向和挑战,认为全栈式的软硬件协同方法是保障高密度混部下应用性能的趋势,该方法有助于全面地提升应用性能的可靠性和数据中心的资源利用率.