由于传统实验室预约系统缺少移动客户端,导致预约效果差。为满足高效预约效果,设计基于UML的实验室多模式自动预约系统。在应用表达层中利用后台SQL Server 2000数据库B/S结构模式,设计手机客户端,保证客户端能够脱机预约。依据业务流程...由于传统实验室预约系统缺少移动客户端,导致预约效果差。为满足高效预约效果,设计基于UML的实验室多模式自动预约系统。在应用表达层中利用后台SQL Server 2000数据库B/S结构模式,设计手机客户端,保证客户端能够脱机预约。依据业务流程,通过自动预约控制电路达到不同人员预约的目的。采用P89C669型号单片机设计以太网通信服务器,为数据层提供更大存储空间。数据层采用根节点与边之比为1∶1方式,实现数据集中控制。利用UML建立的实验实训预约顺序,设计数据库安全存储功能,通过单片机串口向GSM发送AT指令进行短信息接收与发送,依据自动预约流程完成自动预约系统设计。由实验结果可知,所设计系统最高预约效果可达到97%,具有实际应用价值。展开更多
Today's data center networks are designed using densely interconnected hosts in the data center.There are multiple paths between source host and destination server.Therefore,how to balance traffic is key issue wit...Today's data center networks are designed using densely interconnected hosts in the data center.There are multiple paths between source host and destination server.Therefore,how to balance traffic is key issue with the fast growth of network applications.Although lots of load balancing methods have been proposed,the traditional approaches cannot fully satisfy the requirement of load balancing in data center networks.The main reason is the lack of efficient ways to obtain network traffic statistics from each network device.As a solution,the OpenFlow protocol enables monitoring traffic statistics by a centralized controller.However,existing solutions based on OpenFlow present a difficult dilemma between load balancing and packet reordering.To achieve a balance between load balancing and packet reordering,we propose an OpenFlow based flow slice load balancing algorithm.Through introducing the idea of differentiated service,the scheme classifies Internet flows into two categories:the aggressive and the normal,and applies different splitting granularities to the two classes of flows.This scheme improves the performance of load balancing and also reduces the number of reordering packets.Using the trace-driven simulations,we show that the proposed scheme gains over 50%improvement over previous schemes under the path delay estimation errors,and is a practical and efficient algorithm.展开更多
文摘由于传统实验室预约系统缺少移动客户端,导致预约效果差。为满足高效预约效果,设计基于UML的实验室多模式自动预约系统。在应用表达层中利用后台SQL Server 2000数据库B/S结构模式,设计手机客户端,保证客户端能够脱机预约。依据业务流程,通过自动预约控制电路达到不同人员预约的目的。采用P89C669型号单片机设计以太网通信服务器,为数据层提供更大存储空间。数据层采用根节点与边之比为1∶1方式,实现数据集中控制。利用UML建立的实验实训预约顺序,设计数据库安全存储功能,通过单片机串口向GSM发送AT指令进行短信息接收与发送,依据自动预约流程完成自动预约系统设计。由实验结果可知,所设计系统最高预约效果可达到97%,具有实际应用价值。
基金supported by a grant from the National Basic Research Development Program of China(973 Program)(No.2012CB315901,2012CB315906)the National High Technology Research and Development Program of China(863 Program)(No.2011AA01A103)
文摘Today's data center networks are designed using densely interconnected hosts in the data center.There are multiple paths between source host and destination server.Therefore,how to balance traffic is key issue with the fast growth of network applications.Although lots of load balancing methods have been proposed,the traditional approaches cannot fully satisfy the requirement of load balancing in data center networks.The main reason is the lack of efficient ways to obtain network traffic statistics from each network device.As a solution,the OpenFlow protocol enables monitoring traffic statistics by a centralized controller.However,existing solutions based on OpenFlow present a difficult dilemma between load balancing and packet reordering.To achieve a balance between load balancing and packet reordering,we propose an OpenFlow based flow slice load balancing algorithm.Through introducing the idea of differentiated service,the scheme classifies Internet flows into two categories:the aggressive and the normal,and applies different splitting granularities to the two classes of flows.This scheme improves the performance of load balancing and also reduces the number of reordering packets.Using the trace-driven simulations,we show that the proposed scheme gains over 50%improvement over previous schemes under the path delay estimation errors,and is a practical and efficient algorithm.
