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Articles by Hongwei Chen
Total Records ( 3 ) for Hongwei Chen
  Hongwei Chen , Hui Xu , Chunzhi Wang and Ke Zhou
  Due to node’s behavioral analysis, grasping the inertia psychology of its behavior choice and considering whole influences of the network such as group selection, this study establishes the forecast mechanism in P2P network. In the process of network running and node communication, this mechanism carries on real-time surveillance to all nodes, according to the differences of network states and takes the corresponding incentive and penalty measure to the node, thus drives node well serve for the P2P network. This mechanism uses the Markov chain to forecast future development state of the network, combines the forecast of future node state shift situation and adopts more prompt and more effective measure to the network ahead of time. Summarizing the types of network state, each network state mechanism will have a correspond model which will carry on the drive to the node behavior.
  Chunzhi Wang , Ruoxi Wang , Hongwei Chen and Ya Huang
  The process of trust negotiation is the one of the resource requester and resource provider exposing the certificate set and strategy set with each other. The network authentication model based on trust negotiation fulfills the P2P network security, privacy, efficiency and success. The negotiation model will be constructed by the trust game tree. When the negotiation succeeds, cache the certificate sequence and directly show the sequence to complete the negotiation in the next negotiation. But the complete caching sequence will lead a heavy burden and cause safety problems to the system, splitting negotiation process into multi-step and caching part of sequence to improve overall performance. This study builds the caching sequence model based on mixed static game theory and simulates the situation of the caching sequence on partial by introducing the ratio factor. Finally, verify the assumption via the simulation tools named Gambit.
  Hongwei Chen , Kin-Fai Ho , S. C. Lee and Janet E. Nichol
  In this paper, an analytical method using a simple semi-manual cryo-trap technique coupled to gas chromatograph with flame ionisation detector (GC-FID) was developed for the determination of biogenic volatile organic compounds (BVOC) in ambient air. Five common BVOC species have been tested, including isoprene and 4 monoterpenes, i.e. α-pinene, β-pinene, 3-carene (Δ) and limonene. The detection limits were estimated to be about 20 ppt for isoprene and 10 ppt for monoterpenes, with sample injection volume of 50 mL. Based on vegetation types, field measurement work was conducted over urban and rural sites of Hong Kong during summer and winter of 2007. Canister sampling technique was applied in the field measurement. Isoprene contents in rural ambient air were found to be in the range of 60~1560 ppt in winter and 260~3270 ppt in summer, respectively. However, in the measurement of monoterpenes, due to their extremely low concentration in the air samples, only β-pinene and limonene were detected by the developed analytical method.
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