The development direction of railways is toward the improvement of capacity and service quality, where the service quality includes safety, schedule, high speed, and comfort. In light of the existing cellular automato...The development direction of railways is toward the improvement of capacity and service quality, where the service quality includes safety, schedule, high speed, and comfort. In light of the existing cellular automaton models, in this paper, we develop a model to analyze the mixed running processes of trains with maximal speeds of 500 km/h and 350 km/h respectively in the moving block system. In the proposed model, we establish some sound rules to control the running processes of a train, where the rules include the departure rules in the intermediate stations, the overtaking rules, and the conditions of speed limitation for a train stopping at a station or passing through a station. With the consideration of the mixed ratio and the distance between two adjacent stations, the properties of the train traffic flow （including capacity and average speed） are simulated. The numerical results show that the interactions among different trains will affect the capacity, and a proper increase of the spatial distance between two adjacent stations can enhance the capacity and the average speed under the moving block.展开更多
The method of permutation is introduced for the block re, sampling of moving block bootstrap, and is compard with the fixed block bootstrap and stationary bootstrap. Simulations are proformed, which verify that the bl...The method of permutation is introduced for the block re, sampling of moving block bootstrap, and is compard with the fixed block bootstrap and stationary bootstrap. Simulations are proformed, which verify that the block resampling of moving block bootstrap with permutation can effectively eliminete the number of abnormal data in the resampled data set and reduce the resampling errors of estimation.展开更多
With rapid development of the railway traffic, the moving block signaling system （MBS） method has become more and more important for increasing the track capacity by allowing trains to run in a shorter time-headway ...With rapid development of the railway traffic, the moving block signaling system （MBS） method has become more and more important for increasing the track capacity by allowing trains to run in a shorter time-headway while maintaining the required safety margins. In this framework, the tracking target point of the following train is moving forward with its leading train. This paper focuses on the energy saving tracking control of two successive trains in MBS. Nonlinear programming method is used to optimize the energy-saving speed trajectory of the following train. The real-time location of the leading train could be integrated into the optimization process. Due to simplicity, it can be used for online implementation. The feasibility and effectiveness are verified through simulation. The results show that the new method is efficient on energy saving even when disturbances present.展开更多
目的:观察超声引导下股神经阻滞联合复元活血汤对全膝关节置换术后患者疼痛程度及膝关节功能的影响。方法:选择2020年5月至2022年5月就诊于武汉市中医医院骨科收治的拟行全膝关节置换术的60例膝骨关节炎患者,按照随机数字表法分为试验...目的:观察超声引导下股神经阻滞联合复元活血汤对全膝关节置换术后患者疼痛程度及膝关节功能的影响。方法:选择2020年5月至2022年5月就诊于武汉市中医医院骨科收治的拟行全膝关节置换术的60例膝骨关节炎患者,按照随机数字表法分为试验组和对照组,每组各30例。两组患者均给予人工全膝关节置换术,对照组于术后即刻行超声引导下股神经阻滞镇痛,试验组在对照组治疗的基础上口服复原活血汤。记录两组患者手术后第3天、第5天、第7天静息及被动屈曲20°、50°、70°时视觉模拟评分法(visual analogue scale,VAS)评分、患膝关节周缘肿胀差值、关节主动屈伸活动度、美国特种外科医院膝关节功能(hospital for special surgery,HSS)评分。结果:静息0°状态下,术后第3天试验组VAS评分高于对照组(P<0.05),但术后第5天、第7天两组患者VAS评分比较,差异无统计学意义(P>0.05)。被动屈曲20°、45°、70°状态下,术后第3天、第5天、第7天试验组VAS评分高于对照组(P<0.05)。在同一测量点,术后第3天、第5天、第7天试验组患肢肿胀差值大对照组(P<0.05)。术后第3天、第5天、第7天试验组膝关节主动屈曲角度大于对照组(P<0.05)。术后第3天、第5天、第7天试验组膝关节HSS评分高于对照组(P<0.05)。结论:将超声引导下股神经阻滞联合复元活血汤运用于全膝关节置换术后,可降低术后各时间段的静息及主动屈伸时的疼痛程度,缓解患肢肿胀程度,从而增加患膝活动范围,促进膝关节功能恢复。展开更多
In this paper, we propose a new cellular automaton （CA） model for train movement simulations under mixed traffic conditions. A kind of control strategy is employed for trains to reduce energy consumption. In the pro...In this paper, we propose a new cellular automaton （CA） model for train movement simulations under mixed traffic conditions. A kind of control strategy is employed for trains to reduce energy consumption. In the proposed CA model, the driver controls the train movements by using some updated rules. In order to obtain a good insight into the evolution behaviours of the rail traffic flow, we investigate the space-time diagram of the rail traffic flow and the trajectories of the train movements. The numerical simulation results demonstrate that the proposed CA model can well describe the dynamic behaviours of the train movements. Some complex phenomena of train movements can be reproduced, such as the train delay propagations, etc.展开更多
基金Project supported by the State Social Science Fund Project, China (Grant No. 11CJY067)the Natural Science Foundation of Gansu Province, China (Grant No. 1107RJYA070)
文摘The development direction of railways is toward the improvement of capacity and service quality, where the service quality includes safety, schedule, high speed, and comfort. In light of the existing cellular automaton models, in this paper, we develop a model to analyze the mixed running processes of trains with maximal speeds of 500 km/h and 350 km/h respectively in the moving block system. In the proposed model, we establish some sound rules to control the running processes of a train, where the rules include the departure rules in the intermediate stations, the overtaking rules, and the conditions of speed limitation for a train stopping at a station or passing through a station. With the consideration of the mixed ratio and the distance between two adjacent stations, the properties of the train traffic flow （including capacity and average speed） are simulated. The numerical results show that the interactions among different trains will affect the capacity, and a proper increase of the spatial distance between two adjacent stations can enhance the capacity and the average speed under the moving block.
文摘The method of permutation is introduced for the block re, sampling of moving block bootstrap, and is compard with the fixed block bootstrap and stationary bootstrap. Simulations are proformed, which verify that the block resampling of moving block bootstrap with permutation can effectively eliminete the number of abnormal data in the resampled data set and reduce the resampling errors of estimation.
文摘With rapid development of the railway traffic, the moving block signaling system （MBS） method has become more and more important for increasing the track capacity by allowing trains to run in a shorter time-headway while maintaining the required safety margins. In this framework, the tracking target point of the following train is moving forward with its leading train. This paper focuses on the energy saving tracking control of two successive trains in MBS. Nonlinear programming method is used to optimize the energy-saving speed trajectory of the following train. The real-time location of the leading train could be integrated into the optimization process. Due to simplicity, it can be used for online implementation. The feasibility and effectiveness are verified through simulation. The results show that the new method is efficient on energy saving even when disturbances present.
文摘目的:观察超声引导下股神经阻滞联合复元活血汤对全膝关节置换术后患者疼痛程度及膝关节功能的影响。方法:选择2020年5月至2022年5月就诊于武汉市中医医院骨科收治的拟行全膝关节置换术的60例膝骨关节炎患者,按照随机数字表法分为试验组和对照组,每组各30例。两组患者均给予人工全膝关节置换术,对照组于术后即刻行超声引导下股神经阻滞镇痛,试验组在对照组治疗的基础上口服复原活血汤。记录两组患者手术后第3天、第5天、第7天静息及被动屈曲20°、50°、70°时视觉模拟评分法(visual analogue scale,VAS)评分、患膝关节周缘肿胀差值、关节主动屈伸活动度、美国特种外科医院膝关节功能(hospital for special surgery,HSS)评分。结果:静息0°状态下,术后第3天试验组VAS评分高于对照组(P<0.05),但术后第5天、第7天两组患者VAS评分比较,差异无统计学意义(P>0.05)。被动屈曲20°、45°、70°状态下,术后第3天、第5天、第7天试验组VAS评分高于对照组(P<0.05)。在同一测量点,术后第3天、第5天、第7天试验组患肢肿胀差值大对照组(P<0.05)。术后第3天、第5天、第7天试验组膝关节主动屈曲角度大于对照组(P<0.05)。术后第3天、第5天、第7天试验组膝关节HSS评分高于对照组(P<0.05)。结论:将超声引导下股神经阻滞联合复元活血汤运用于全膝关节置换术后,可降低术后各时间段的静息及主动屈伸时的疼痛程度,缓解患肢肿胀程度,从而增加患膝活动范围,促进膝关节功能恢复。
基金Project supported by the National Natural Science Foundation of China （Grant No 70471088）, the National Basic Research Program of China （Grant No 2006CB705500） and the Science and Technology Foundation of Beijing Jiaotong University （Grant No 2004SM026）.
文摘In this paper, we propose a new cellular automaton （CA） model for train movement simulations under mixed traffic conditions. A kind of control strategy is employed for trains to reduce energy consumption. In the proposed CA model, the driver controls the train movements by using some updated rules. In order to obtain a good insight into the evolution behaviours of the rail traffic flow, we investigate the space-time diagram of the rail traffic flow and the trajectories of the train movements. The numerical simulation results demonstrate that the proposed CA model can well describe the dynamic behaviours of the train movements. Some complex phenomena of train movements can be reproduced, such as the train delay propagations, etc.
