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Epidemic spreading behavior with time delay on
local-world evolving networks
XIA Chengyi, LIU Zhongxin, CHEN Zengqiang, YUAN Zhuzhi, XIA Chengyi, SUN Shiwen
Front. Electr. Electron. Eng.. 2008, 3 (2): 129-135.
https://doi.org/10.1007/s11460-008-0033-3
An improved susceptible-infected-susceptible (SIS) model in the local-world evolving network model is presented to study the epidemic spreading behavior with time delay, which is added into the infected phase. The local-world evolving model displays a transition from the exponential network to the scale-free network with respect to the degree distribution. Two typical delay regimes, i.e., uniform and degree-dependent delays are incorporated into the SIS epidemic model to investigate the epidemic infection processes in the local-world network model. The results indicate that the infection delay will promote the epidemic outbreaks, increase the prevalence and reduce the critical threshold of epidemic spreading. It is also found that local-world size M will considerably influence the epidemic spreading behavior with time delay in the local-world network through large-scale numerical simulations. Simulation results are also of relevance to fight epidemic outbreaks.
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A PO-CI/MC-CDMA scheme for high modulation styles
ZHANG Yanyan, TAO Xiaofeng, ZHU Xiaoxuan, ZHANG Ping, TANG Lisha
Front. Electr. Electron. Eng.. 2008, 3 (2): 145-149.
https://doi.org/10.1007/s11460-008-0024-4
Through analyzing the theoretical spreading principle, it has been proved in this paper that the benefit of pseudo-orthogonal carrier interferometry (PO-CI) spreading code is not supported when complex signal modulation (e.g., quadrature phase-shift keying (QPSK) and quadrature amplitude modulation (QAM)) types are employed. On this basis, a novel and feasible structure for this problem is brought forward. Within the structure mentioned, instead of complex modulation patterns, pulse amplitude modulation (PAM) combined with PO-CI spreading code is utilized. This allows us to maintain the throughput increase of a multi-carrier code division multiple access (MC-CDMA) system with minimal loss in performance and no bandwidth expansion.
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Using Petri nets to verify acyclic rule-based
system
DING Zhijun, PAN Meiqin, JIANG Changjun, HAN Yaojun
Front. Electr. Electron. Eng.. 2008, 3 (2): 155-161.
https://doi.org/10.1007/s11460-008-0042-2
A series of Petri net-based definitions were formulated for describing four types of structural errors in a rule-based system (RBS), including inconsistency, incompleteness, redundancy and circularity. A marked ?-Petri net model of acyclic RBS was constructed. Then, its reachability tree was generated to record all reachable relations between propositions in RBS. Moreover, a backward reasoning forest of a reachable marking was generated for explicitly representing reachable paths in RBS. Finally, a set of theorems and algorithms were provided to analyze and check structural errors. The usability of the research results presented in this paper was illustrated by an example.
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Using experimental designs for modelling of intermittent
air filtration process
TILMATINE A., BRAHAMI M., MILOUA F., GOURI R., DASCALESCU L.
Front. Electr. Electron. Eng.. 2008, 3 (2): 218-222.
https://doi.org/10.1007/s11460-008-0040-4
Identification of the optimal operating conditions and evaluation of their robustness are critical issues for industrial processes. A standard procedure, for modelling a laboratory-scale wire-to-cylinder electrostatic precipitator and for guiding the research of the set point, is presented. The procedure consists of formulating a set of recommendations regarding the choice of parameter values for electrostatic precipitation. The experiments were carried out on a laboratory cylindrical precipitator, built by one of the authors, with samples of wood particles. The parameters considered are the applied high voltage U, the air flow F, and the quantity of dust in air m. Several “one-factor-at-a-time” followed by factorial composite design experiments were performed, based on the following three-step strategy: 1) Identify the domain of variation of the variables; 2) Determine the mathematical model of the process outcome; 3) Validation of the mathematical model and optimisation of the process.
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Enhancement of wave and acceleration of electron
in plasma in the external field
WU Jun, WU Jun, WU Jian, LI Qiang
Front. Electr. Electron. Eng.. 2008, 3 (2): 223-226.
https://doi.org/10.1007/s11460-008-0028-0
This paper investigates the enhancement of Langmuir and ion-acoustic wave and the acceleration of the electron in collisionless plasma, in the presence of an external transverse field. Based on hydrodynamic equations, an equation formulizing the parametric instability was derived. Furthermore, the formula for ponderomotive force and the expression that describes the electron acceleration were obtained. The results show that Langmuir and ion-acoustic wave are enhanced and the charged particles can be accelerated by the coupling of wave-wave. In addition, it can be concluded that ponderomotive force, due to the coupling of the external field (pump) to the Langmuir wave (ion-acoustic wave), is the driving force to excite the parametric instability and comprises the high- and low-frequency components.
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The design and fabrication on gate type resonant
tunneling transistor
GUO Weilian, LIANG Huilai, SONG Ruiliang, ZHANG Shilin, MAO Luhong, HU Liuchang, LI Jianheng, QI Haitao, GUO Weilian, FENG Zhen, TIAN Guoping, SHANG Yuehui, LIU Yongqiang, LI Yali, YUAN Mingwen, LI Xiaobai
Front. Electr. Electron. Eng.. 2008, 3 (2): 227-233.
https://doi.org/10.1007/s11460-008-0029-z
In light of fabricating resonant tunneling diode (RTD), in this paper a GaAs-based resonant tunneling transistor with gate structure (GRTT) has been designed and fabricated successfully. A systematic depiction centers on the designs of material structure, device structure, photolithography mask, fabrication of device and the measurement and analysis of parameters. The fabricated GRTT has a maximum PVCR of 46 and a maximum transconductance of 8 mS. The work lays the foundation for further improvement on the performance and parameters of RTT.
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23 articles
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