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A FAST SEAMLESS HANDOVER SCHEME AND ITS CDT OPTIMIZATION FOR PING-PONG TYPE OF MOVEMENT 被引量:3
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作者 Wang Yumlng Yang Zongkai +2 位作者 Zhao Dasheng He Jianhua Fu Xiaoming 《Journal of Electronics(China)》 2006年第2期298-303,共6页
In mobile IPv6 networks, the ping-pong type of movement brings about frequent handovers and thus increases signaling burden. This letter proposes a fast seamless handover scheme where the access router keeps the mobil... In mobile IPv6 networks, the ping-pong type of movement brings about frequent handovers and thus increases signaling burden. This letter proposes a fast seamless handover scheme where the access router keeps the mobile node's old reservation till the offline Count Down Timer (CDT) expires in order to reduce handover signaling and delay while the mobile node returns in a very short period of time. Based upon a pois son mobility model, an simple expression for CDT optimization is given out for the scheme to achieve the best cost performance of resource reservation. 展开更多
关键词 Mobile IPv6 Ping-pong type of movement QoS signaling Handover delay Cost performance.
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Influence and hazard of disastrous space weather on power grid in China
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作者 Liu Lianguang Zheng Kuan Liu Chunming 《Engineering Sciences》 EI 2011年第4期83-87,共5页
Based on the measured data of geomagnetically induced currents (GIC) in Guangdong Ling' ao 500 kV power networks during several magnetic storms at the peak years of 23rd Solar Cycle, the GIC calculation results of ... Based on the measured data of geomagnetically induced currents (GIC) in Guangdong Ling' ao 500 kV power networks during several magnetic storms at the peak years of 23rd Solar Cycle, the GIC calculation results of 750 kV planning power grid in Shartxi, Gansu, Qinghai and Ningxia, the structure and characteristics of power networks from 500 kV to 1 000 kV, and super magnetic storm in 1859 are analyzed in this paper. Through the analysis, the possible impacts of extreme space weather on the future ultra-high voltage (UHV) grid, the security of large-scale power system in China are expounded, and the research suggestions coping with the strong solar storms are proposed. 展开更多
关键词 space weather magnetic storm GIC UHV power grid security
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AN EFFICIENT DISTRIBUTED ALGORITHM FOR CONNECTED DOMINATING SET CONSTRUCTION IN WIRELESS SENSOR NETWORKS
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作者 Yang Zongkai Zhao Dasheng +1 位作者 Wang Yuming He Jianhua 《Journal of Electronics(China)》 2005年第6期671-675,共5页
Efficient broadcasting protocols based on Connected Dominating Set (CDS) are frequently used;hence the entire broadcast domain is restricted to nodes in the CDS. This letter proves that a node must be a CDS node, if i... Efficient broadcasting protocols based on Connected Dominating Set (CDS) are frequently used;hence the entire broadcast domain is restricted to nodes in the CDS. This letter proves that a node must be a CDS node, if its neighbors with larger keys cannot cover it together.Then a simple distributed CDS construction algorithm is proposed, which is more effective than the existing algorithms in reducing the dominating set size and the computation complexity at the same time. Simulation results also confirm this, especially in relatively dense networks. 展开更多
关键词 Sensor network BROADCAST Connected Dominating Set (CDS)
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REVIEW OF HIGH LEVEL FAULT MODELING APPROACHES FOR MIXED-SIGNAL SYSTEMS
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作者 Xia Likun Ian Bell Antony Wilkinson 《Journal of Electronics(China)》 2010年第4期490-497,共8页
In the modern analogue design, Transistor Level Fault Simulation (TLFS) plays the im-portant part since every fault in the whole circuit has to be simulated at that level. Unfortunately, it is a very CPU intensive tas... In the modern analogue design, Transistor Level Fault Simulation (TLFS) plays the im-portant part since every fault in the whole circuit has to be simulated at that level. Unfortunately, it is a very CPU intensive task even though it maintains the high accuracy. Therefore, High Level Fault Modeling (HLFM) and High Level Fault Simulation (HLFS) are required in order to alleviate the efforts of simulation. In this paper, different HLFM approaches are reviewed at the device level during last two decades. We clarify their domains of application and evaluate their strengths and current limitations. We also analyze causes of faults and introduce various test approaches. 展开更多
关键词 High Level Fault Modeling (HLFM) Automated Model Generation (AMG)
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