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Estimation method for a skip-stop operation strategy for urban rail transit in China 被引量:8
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作者 Zhichao Cao Zhenzhou Yuan Dewei Li 《Journal of Modern Transportation》 2014年第3期174-182,共9页
The skip-stop operation strategy (SOS) is rarely applied to Chinese urban rail transit networks because it is a simple scheme and a less universally popular transportation service. However, the SOS has performance a... The skip-stop operation strategy (SOS) is rarely applied to Chinese urban rail transit networks because it is a simple scheme and a less universally popular transportation service. However, the SOS has performance advantages, in that the total trip time can be reduced depending on the number of skipped stations, crowds of passengers can be rapidly evacuated at congested stations in peak periods, and the cost to transit companies is reduced. There is a contradiction between reducing the trip time under the SOS and increasing the passengers' waiting times under an all-stop scheme. Given this situation, the three objectives of our study were to minimize the waiting and trip times of all passengers and the travel times of trains. A comprehensive estimation model is presented for the SOS. The mechanism through which the trip time for all passengers is affected by the SOS is analyzed in detail. A 0-I integer programming formulation is established for the three objectives, and is solved using a tabu search algorithm. Finally, an example is presented to demonstrate that the estimation method for the SOS is capable of optimizing the timetable and operation schemes for a Chinese urban rail transit network. 展开更多
关键词 rail transit algorithm Skip-stop operation strategy network Integer programming Chinese urban GENETIC
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Strategies of Transition to IPv6
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作者 Gu Zhongyu (Data Division of ZTE Corporation, Nanjing 210012, China) 《ZTE Communications》 2005年第2期14-16,共3页
The paper briefly describes the necessity of introducing IPv6 into networks and the fact that IPv4 and IPv6 will coexist in operators' networks for a long time. It also introduces Dual Stack, Tunneling and Transla... The paper briefly describes the necessity of introducing IPv6 into networks and the fact that IPv4 and IPv6 will coexist in operators' networks for a long time. It also introduces Dual Stack, Tunneling and Translation technologies for the transition from IPv4 to IPv6 and their coexistence. Moreover, it makes a brief analysis of transition strategies of operators' networks to IPv6 networks. 展开更多
关键词 Strategies of transition to IPv6 ISATAP
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Transition control of a tail-sitter unmanned aerial vehicle with L1 neural network adaptive control 被引量:1
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作者 Jingyang ZHONG Chen WANG Hang ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第7期460-475,共16页
The main task of this work is to design a control system for a small tail-sitter Unmanned Aerial Vehicle(UAV)during the transition process.Although reasonable control performance can be obtained through a well-tuned s... The main task of this work is to design a control system for a small tail-sitter Unmanned Aerial Vehicle(UAV)during the transition process.Although reasonable control performance can be obtained through a well-tuned single PID or cascade PID control architecture under nominal conditions,large or fast time-varying disturbances and a wide range of changes in the equilibrium point bring nonlinear characteristics to the transition control during the transition process,which leads to control precision degradation.Meanwhile,the PID controller’s tuning method relies on engineering experiences to a certain extent and the controller parameters need to be retuned under different working conditions,which limits the rapid deployment and preliminary validation.Based on the above issues,a novel control architecture of L1 neural network adaptive control associated with PID control is proposed to improve the compensation ability during the transition process and guarantee the security transition.The L1 neural network adaptive control is revised to solve the multi-input and multi-output problem of the tail-sitter UAV system in this study.Finally,the transition characteristics of the time setting difference between the desired transition speed and the desired transition pitch angle are analyzed. 展开更多
关键词 L1 adaptive control Neural network transition control Tail-sitter UAV transition strategy
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Simultaneous optimization of transit network and public bicycle station network 被引量:1
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作者 刘洋 朱宁 马寿峰 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第4期1574-1584,共11页
The traditional manner to design public transportation system is to sequentially design the transit network and public bicycle network. A new public transportation system design problem that simultaneously considers b... The traditional manner to design public transportation system is to sequentially design the transit network and public bicycle network. A new public transportation system design problem that simultaneously considers both bus network design and public bicycle network design is proposed. The chemical reaction optimization(CRO) is designed to solve the problem. A shortcoming of CRO is that, when the two-molecule collisions take place, the molecules are randomly picked from the container.Hence, we improve CRO by employing different mating strategies. The computational results confirm the benefits of the mating strategies. Numerical experiments are conducted on the Sioux-Falls network. A comparison with the traditional sequential modeling framework indicates that the proposed approach has a better performance and is more robust. The practical applicability of the approach is proved by employing a real size network. 展开更多
关键词 public transportation system transit route design bicycle sharing system chemical reaction optimization mating strategy
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