Amid the landscape of Cloud Computing(CC),the Cloud Datacenter(DC)stands as a conglomerate of physical servers,whose performance can be hindered by bottlenecks within the realm of proliferating CC services.A linchpin ...Amid the landscape of Cloud Computing(CC),the Cloud Datacenter(DC)stands as a conglomerate of physical servers,whose performance can be hindered by bottlenecks within the realm of proliferating CC services.A linchpin in CC’s performance,the Cloud Service Broker(CSB),orchestrates DC selection.Failure to adroitly route user requests with suitable DCs transforms the CSB into a bottleneck,endangering service quality.To tackle this,deploying an efficient CSB policy becomes imperative,optimizing DC selection to meet stringent Qualityof-Service(QoS)demands.Amidst numerous CSB policies,their implementation grapples with challenges like costs and availability.This article undertakes a holistic review of diverse CSB policies,concurrently surveying the predicaments confronted by current policies.The foremost objective is to pinpoint research gaps and remedies to invigorate future policy development.Additionally,it extensively clarifies various DC selection methodologies employed in CC,enriching practitioners and researchers alike.Employing synthetic analysis,the article systematically assesses and compares myriad DC selection techniques.These analytical insights equip decision-makers with a pragmatic framework to discern the apt technique for their needs.In summation,this discourse resoundingly underscores the paramount importance of adept CSB policies in DC selection,highlighting the imperative role of efficient CSB policies in optimizing CC performance.By emphasizing the significance of these policies and their modeling implications,the article contributes to both the general modeling discourse and its practical applications in the CC domain.展开更多
On the basis of expounding the research results of using relevant knowledge about Game Theory for supply chain of agricultural products at home and abroad,we use principal-agent model in Game Theory to research the ne...On the basis of expounding the research results of using relevant knowledge about Game Theory for supply chain of agricultural products at home and abroad,we use principal-agent model in Game Theory to research the new function that the supermarkets entrust supervision and control over quality of agricultural products to agricultural brokers in the circulation model of connecting agriculture with supermarkets;then design the optimal incentive contract and influencing factors between agricultural broker and supermarket,and explain the fundamental role of agricultural brokers in the process of circulation;finally in light of the role of government in promoting development and application of agricultural brokers,put forward corresponding policy suggestions:establish government support policy;set relevant standard of industry;establish cooperative organizations of agricultural brokers.展开更多
Based on the investigation into the rural labor brokers in Chongqing Municipality,the developmental momentum of rural labor brokers in Chongqing Municipality is introduced.The valid questionnaires show that the main f...Based on the investigation into the rural labor brokers in Chongqing Municipality,the developmental momentum of rural labor brokers in Chongqing Municipality is introduced.The valid questionnaires show that the main factors which limit the development of rural labor brokers in Chongqing Municipality are the scant effective information,low quality,insufficient education and training,absent of specialized policies and regulations,low degree of organization,and low social recognition.The requirements for the healthy development of rural labor brokers are concluded,which include healthy policies and regulations,healthy social culture and the external support from the government.Besides,the rural labor brokers should have high competence,high professional ethnics,strong awareness of law and relatively high educational level.At last,the targeted countermeasures are put forward,which cover strengthening the construction of rural infrastructure;perfecting the information platform;enhancing training efforts and improving the competence of labor brokers;establishing and consolidating laws and regulations,and fostering well legal atmosphere;paying attention to the construction of organization and trying to famous the famous brands of rural labors;intensifying the promotion and creating favorable cultural environment.These countermeasures aim at enhancing the capability of attracting rural surplus labors,accelerating the structure of income distribution and coordinating the urban and rural development.展开更多
针对当前电子商务面临的海量数据处理和高吞吐量的需求,设计了一个异步计算的分布式系统。该系统使用SQL Service Broker作为分布节点间异步通信的载体,采用面向服务的数据库设计理念,使用NT Service作为逻辑处理单元,由Web ervice进行...针对当前电子商务面临的海量数据处理和高吞吐量的需求,设计了一个异步计算的分布式系统。该系统使用SQL Service Broker作为分布节点间异步通信的载体,采用面向服务的数据库设计理念,使用NT Service作为逻辑处理单元,由Web ervice进行发布,完成了基于Internet分布式异步计算。在此基础上实现了简单的订单系统,证明了系统的可行性。展开更多
The admission control issue in the design of a centralized bandwidth broker model for dynamic control and management of QoS provisioning is studied. A two-phase differentiated flow treatment based dynamic admission co...The admission control issue in the design of a centralized bandwidth broker model for dynamic control and management of QoS provisioning is studied. A two-phase differentiated flow treatment based dynamic admission control scheme under the centralized bandwidth broker model is proposed. In the proposed scheme, the flow requests are classified into two classes and get differentiated treatment according to their QoS demands. We demonstrate that this admission control scheme can not only improve the resource utilization but also guarantee the flows’ QoS. Furthermore, the admission control is divided into two phases: edge admission control and interior admissio-n control. During the interior phase, the PoQ scheme is adopted, which enhances the call processing capability of the bandwidth broker. The simulation results show that the proposed scheme can result in lower flow blocking probability and higher resource utilization. And it also reduces the number of QoS state accesses/updates, thereby increasing the overall call processing capability of the bandwidth broker.展开更多
文摘Amid the landscape of Cloud Computing(CC),the Cloud Datacenter(DC)stands as a conglomerate of physical servers,whose performance can be hindered by bottlenecks within the realm of proliferating CC services.A linchpin in CC’s performance,the Cloud Service Broker(CSB),orchestrates DC selection.Failure to adroitly route user requests with suitable DCs transforms the CSB into a bottleneck,endangering service quality.To tackle this,deploying an efficient CSB policy becomes imperative,optimizing DC selection to meet stringent Qualityof-Service(QoS)demands.Amidst numerous CSB policies,their implementation grapples with challenges like costs and availability.This article undertakes a holistic review of diverse CSB policies,concurrently surveying the predicaments confronted by current policies.The foremost objective is to pinpoint research gaps and remedies to invigorate future policy development.Additionally,it extensively clarifies various DC selection methodologies employed in CC,enriching practitioners and researchers alike.Employing synthetic analysis,the article systematically assesses and compares myriad DC selection techniques.These analytical insights equip decision-makers with a pragmatic framework to discern the apt technique for their needs.In summation,this discourse resoundingly underscores the paramount importance of adept CSB policies in DC selection,highlighting the imperative role of efficient CSB policies in optimizing CC performance.By emphasizing the significance of these policies and their modeling implications,the article contributes to both the general modeling discourse and its practical applications in the CC domain.
基金Supported by National College Students Innovation Program in 2009(091029532)
文摘On the basis of expounding the research results of using relevant knowledge about Game Theory for supply chain of agricultural products at home and abroad,we use principal-agent model in Game Theory to research the new function that the supermarkets entrust supervision and control over quality of agricultural products to agricultural brokers in the circulation model of connecting agriculture with supermarkets;then design the optimal incentive contract and influencing factors between agricultural broker and supermarket,and explain the fundamental role of agricultural brokers in the process of circulation;finally in light of the role of government in promoting development and application of agricultural brokers,put forward corresponding policy suggestions:establish government support policy;set relevant standard of industry;establish cooperative organizations of agricultural brokers.
基金Supported by the Programs of Chongqing Planning Office of Social Science Foundation (CSTC,2008CE9046)
文摘Based on the investigation into the rural labor brokers in Chongqing Municipality,the developmental momentum of rural labor brokers in Chongqing Municipality is introduced.The valid questionnaires show that the main factors which limit the development of rural labor brokers in Chongqing Municipality are the scant effective information,low quality,insufficient education and training,absent of specialized policies and regulations,low degree of organization,and low social recognition.The requirements for the healthy development of rural labor brokers are concluded,which include healthy policies and regulations,healthy social culture and the external support from the government.Besides,the rural labor brokers should have high competence,high professional ethnics,strong awareness of law and relatively high educational level.At last,the targeted countermeasures are put forward,which cover strengthening the construction of rural infrastructure;perfecting the information platform;enhancing training efforts and improving the competence of labor brokers;establishing and consolidating laws and regulations,and fostering well legal atmosphere;paying attention to the construction of organization and trying to famous the famous brands of rural labors;intensifying the promotion and creating favorable cultural environment.These countermeasures aim at enhancing the capability of attracting rural surplus labors,accelerating the structure of income distribution and coordinating the urban and rural development.
文摘针对当前电子商务面临的海量数据处理和高吞吐量的需求,设计了一个异步计算的分布式系统。该系统使用SQL Service Broker作为分布节点间异步通信的载体,采用面向服务的数据库设计理念,使用NT Service作为逻辑处理单元,由Web ervice进行发布,完成了基于Internet分布式异步计算。在此基础上实现了简单的订单系统,证明了系统的可行性。
文摘The admission control issue in the design of a centralized bandwidth broker model for dynamic control and management of QoS provisioning is studied. A two-phase differentiated flow treatment based dynamic admission control scheme under the centralized bandwidth broker model is proposed. In the proposed scheme, the flow requests are classified into two classes and get differentiated treatment according to their QoS demands. We demonstrate that this admission control scheme can not only improve the resource utilization but also guarantee the flows’ QoS. Furthermore, the admission control is divided into two phases: edge admission control and interior admissio-n control. During the interior phase, the PoQ scheme is adopted, which enhances the call processing capability of the bandwidth broker. The simulation results show that the proposed scheme can result in lower flow blocking probability and higher resource utilization. And it also reduces the number of QoS state accesses/updates, thereby increasing the overall call processing capability of the bandwidth broker.
