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Infrastructure as a Service (IaaS) is a service mode of cloud, which provides Virtual Machines (VMs) to customers. With the increasingly fierce competition in market, cloud providers pay more attention to Quality of service (Qos). As the practical measurement costs a large amount of resource, deriving performance metrics from analytical model is a good choice. Recently, Stochastic Petri Net (SPN)...
The digital double loop current control become the promising technique for digital switching DC-DC converters. In this paper a novel current control technique, named cycle-borrow control is proposed and studied, which has faster loop transient response than the time delay control, and its requirement to loop processing speed can be relaxed as compared with the deadbeat current control. The cycle-borrow...
The current-splitting architecture for the current-steering DAC can reduce the area of the current source array greatly. A background calibration technique for current-steering digital-to-analog (DAC) with the current-splitting array is presented. The proposed calibration technique can eliminate mismatch errors for both the upper bits array and the lower bits array in the background. A 14-bit current-steering...
With the rapid economic development of our country, the acceleration of urban construction, the distribution network load increases, its scale is expanded gradually, network structure tended to become complicated. In order to improve power supply reliability, we can use heuristic algorithm in distribution network fault location, its divide fault matrix into several unit marix and judgment, it can...
This paper analyses the methods and shortages of recent physical topology discovery, and proposes an algorithm based on SNMP. The algorithm proposes three concepts concerning ports of switch, in addition the way how to deal with unsure links caused by dump devices. The algorithm can accurately discover the links between switches including backup links, links between switch and host. The algorithm...
Along with the development and application of the high speed network, in order to reduce the cost of data copy and context switch, the paper presents an improved method of zero-copy data transmission that is suitable for the high speed network environment on Linux and UNIX platforms. The method can reduce the number of data copy and context switch between kernel and user mode. It is tested by transmitting...
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