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Pengcheng Qin,Jie He,Changjian Zhang,Yuntao Ye,Hao Zhang,Mingnian Wang,Tao Yan 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.9
Extra-long tunnels have adverse effects on driving performance since drivers will be affected by the enclosed, dimly lit, and monotonous environment for a longer time. In the context of the increasing number of extra-long tunnels, this study aims to investigate the effects of extra-long freeway tunnels with a length of 20 km on driving performance using driving simulation tests. Factors including the tunnel environment, driving time, traffic flow, and gender were considered as influencing factors. Performance indicators including the brake reaction time, standard deviation of driving speed, and standard deviation of lateral position were collected. A total of 60 drivers were recruited for the driving simulation study, and the relationships between the driving performance indicators and influencing factors were analyzed by establishing linear mixed models with random intercept. The results demonstrate that driving performance significantly degraded after 5 − 6 min of driving in the extra-long tunnel although drivers were more cautious and presented a better performance when just entering the tunnel. Moderately higher traffic flow could improve driving performance in the extra-long tunnel but not on the open road. Meanwhile, female drivers had better lateral and longitudinal stability in the extra-long tunnel, while no significant difference was witnessed in reaction ability and driving performance on the open road.
Hardy inequalities in half spaces of the Heisenberg group
Junqiang Han,Pengcheng Niu,Wenji Qin 대한수학회 2008 대한수학회보 Vol.45 No.3
In this paper we prove some Hardy inequalities in the half space of the Heisenberg group and indicate the sharp constant. In this paper we prove some Hardy inequalities in the half space of the Heisenberg group and indicate the sharp constant.
HARDY INEQUALITIES IN HALF SPACES OF THE HEISENBERG GROUP
Han, JunQiang,Niu, Pengcheng,Qin, Wenji Korean Mathematical Society 2008 대한수학회보 Vol.45 No.3
In this paper we prove some Hardy inequalities in the half space of the Heisenberg group and indicate the sharp constant.
Neutronic Study of Utilization of Discrete Thorium-Uranium Fuel Pins in CANDU-6 Reactor
Nianbiao Deng,Tao Yu,Jinsen Xie,Zhenping Chen,Qin Xie,Pengcheng Zhao,Zijing Liu,Wenjie Zeng 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.2
Targeting at simulating the application of thorium-uranium (TU) fuel in the CANDU-6 reactor, this paperanalyzes the process using the code DRAGON/DONJON where the discrete TU fuel pins are applied in theCANDU-6 reactor under the time-average equilibrium refueling. The results show that the coolant voidreactivity of the assembly analyzed in this paper is lower than that of 37-element bundle cell withnatural uranium and 37-element bundle cell with mixed TU fuel pins; that the max time-averagechannel/bundle power of the core meets the limits - less than 6700kW/860 kW; that the fuel conversionratio is higher than that of the CANDU-6 reactor with natural uranium; and that the exit burnupincreases to 13400 MWd/tU. Thus, the simulation in this paper with the fuel in the 37-element bundlecell using discrete TU fuel pins can be considered to be applied in CANDU-6 reactor with adequatemodifications of the core structure and operating modes.