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Shan X.,China Academy of Railway Sciences | Zhou L.,China Academy of Railway Sciences | Lu X.,China Academy of Railway Sciences | Zhang J.,China Academy of Railway Sciences | Wang L.,Beijing Railway Bureau
Zhongguo Tiedao Kexue/China Railway Science | Year: 2011

According to the characteristics of railway passenger flow and season as well as the law of booking in advance, combined with the historical data of passenger flow and expert experience, the time series analysis method was adopted to establish the passenger flow prediction model to predict the passenger flow for passenger train ODs. Based on the predicted OD passenger flow, with the maximization in passenger load factor of the whole journey for passenger train, the income and the whole benefit as target, the core principles for pre-assigning ticket allotment was put forward. The core principles were long distance first and then short distance, seat first and then no seat, pre-assignment first according to number and then proportion, etc. The algorithm for pre-assigning ticket allotment was given. On this basis, the intelligent pre-assignment system for railway passenger train ticket allotment was constructed. The results of practical application show that the system has realized the dynamic allocation of railway passenger train ticket allotment, improved the enthusiasm for organizing passenger flow at stations on the way and increased the passenger load factor of passenger train.

Tang J.-J.,Beijing Jiaotong University | Zhou L.-S.,Beijing Jiaotong University | Ran F.,Tianjin Nan huan Railway Co. | Chen L.-C.,Beijing Railway Bureau
Tiedao Xuebao/Journal of the China Railway Society | Year: 2012

The soft conflict occurring between running lines in the high-speed train diagram to make trains unable to run at the appropriate power was defined, which was found hard to solve the soft conflict problems with the existing methods of formulating the train diagram. The mechanism and influence of forming soft conflicts between high-speed train running lines were analyzed. It was demonstrated that the method of integrated simulation of traction power supply and train group operation could better solve the soft conflict problems, namely, traction power supply calculations were used to detect soft conflicts of the train diagram and on this basis train operation simulation adjustment was made to get rid of the soft conflicts. The proposed method proves effective in rejecting soft conflicts of the train diagram, provides the control strategy of the train operation process, and solves some difficult problems in simulation calculation of AC traction power supply. Finally a train diagram was formulated and based on adjustment of soft conflicts for a real high-speed railway line in China.

Wang L.,Beijing Jiaotong University | Zhang X.,Beijing Jiaotong University | Ma J.,Beijing Railway Bureau
Zhongguo Tiedao Kexue/China Railway Science | Year: 2012

According to the critical quantity of common dangerous chemicals in storage prescribed by relative national standard, an environment risk evaluation model is proposed for distribution optimization of railway dangerous goods handling station. On this basis, a bi-level programming model for the distribution optimization of dangerous goods handling station is constructed in the light of the principal and subordinate hierarchical decision-making relationship between railway decision-making section and the clients of dangerous goods transport. The objective of the upper programming model is to minimize the total environment risk and maximize the total freight volume of dangerous goods handling station in a certain area, and that of the lower programming model is to minimize the total transport cost of the clients. With the model, dangerous goods handling stations can be reasonably located and the categories of dangerous goods to be handled can be determined. By formatting the reaction function between the upper and lower decision variables, a heuristic algorithm of the model is developed. A computational example illustrates that the model and its algorithm are feasible and effective.

You Y.W.,Beijing Jiaotong University | Jia J.F.,Beijing Jiaotong University | Wu J.G.,Beijing Railway Bureau
Applied Mechanics and Materials | Year: 2013

With the building and operating of passenger line, the competition of integrated traffic system in region and avenue not only consists among all kinds of transportation modes, it embodies among various kinds of passenger transport products (PTP) between the existing line and passenger line. Keep up market-oriented principle, start with analysis of passenger travelling demand and use the qualitative and quantitative analysis to predict the share ratio of PTP rationally under the research of the substitutability of passenger transport demand (PTD) based on the theory of set pair analysis and generalized cost, and make the market orientation clear that plays an important role in promoting the division of work among existing line and passenger line, avoiding resource-wasting of infrastructure, and making the maximize benefits of the railway transport enterprises under the conditions of the market demand. © (2013) Trans Tech Publications, Switzerland.

Li J.,Beijing Railway Bureau | Liu Z.,Beijing Jiaotong University | Ning T.,Beijing Jiaotong University
ICEOE 2011 - 2011 International Conference on Electronics and Optoelectronics, Proceedings | Year: 2011

A novel linear-cavity erbium-doped fiber laser is proposed and demonstrated. By using a 3 dB coupler as the reflecting mirror and an uniform fiber Bragg grating as the partial reflecting mirror and the wavelength selector, a stable laser output is obtained at room temperature. The full-width at half maximum, the side mode suppression ratio and the output power fluctuation are measured to be small than 0.014 nm, better than 40 dB and less than 0.43 dB, respectively. Furthermore, the lasing wavelength doses not drift in four hours. © 2011 IEEE.

Liu P.,Chengdu University of Technology | Liu Y.,Beijing Railway Bureau | Ge L.,Chengdu University of Technology | Chen C.,Chengdu University of Technology
Journal of Communications | Year: 2015

In this paper, an embedded Markov chain model is proposed to analyze the signaling cost of the Movement-Based Location Update (MBLU) scheme under which a Location Update (LU) occurs whenever the number of cells crossed reaches a threshold, called movement threshold. Compared with existing literature, this paper has the following advantages. 1) This paper proposes an embedded Markov chain model in which the cell residence time follows Hyper-Erlang distribution. 2) This paper considers the Location Area (LA) architecture. 3) This paper emphasize the dependency between the cell and LA residence times using a fluid flow model. Close-form expressions for the signaling cost produced by LU and paging operations are derived, and their accuracy is validated by simulation. Based on the derived analytical expressions, we conduct numerical studies to investigate the impact of diverse parameters on the signaling cost. © 2015 Journal of Communications.

Liu Z.,Beijing Jiaotong University | Li J.,Beijing Railway Bureau | Jiang W.,Beijing Jiaotong University | Ning T.,Beijing Jiaotong University | Jian S.,Beijing Jiaotong University
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2010

Using Fresnel-Huygens principle based on Fourier optics, a model is presented to simulate the field propagation in an arrayed waveguide grating demultiplexer. The impact of Fresnel approximation on Gaussian far-field diffraction in free propagation region is analyzed. An efficient and accurate modified formula is given considering the fourth order quantitative error and compared with conventional Fourier optics algorithm and the method of Stigmatic Points. A design example of a 1 × 256 channel arrayed waveguide grating demultiplexer with 0.4 nm channel spacing and low channel crosstalk is presented to verify the accuracy of the modified formula.

Li J.,Beijing Railway Bureau | Liu Z.,Beijing Jiaotong University | Wang Z.,Beijing Communication Section | Yang W.,Beijing Communication Section | And 3 more authors.
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2011

Considering a case of call drop happened when switching between two cells in GSM-R network of Shi-Tai passenger dedicated railway, With several network optimization methods, such as traffic statistics analysis?drive test and dynamic test, and then investigating the handover algorithm and impacts of optical repeater station to base station receptivity, it comes to the conclusion that the reasons of the problem are as follows: The network field coverage is unconscionable; the uplink gain of optical repeater stations belonged to one cell is exceeded. By adjusting the inter-cell antenna elevation angle and the uplink gain of those optical repeater stations, the normal handover between those cells is realized and the problem of call drop is solved successfully.

Yang S.-J.,Beijing STONE Intelligent Transportation System Integration Co. | Peng H.-Q.,Beijing Jiaotong University | Wang X.,Beijing Railway Bureau
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2011

Design of traffic signs will affect the route choices of drivers and affect the efficiency of road utilization. This research analyzes the characteristics of the traffic flows of various types of vehicles coming into and going out of the Beijing Southern Railway Station. It is found that the traffic signs on the roads near the Beijing South Railway Station are not enough, and some of the existing traffic signs are discontinuous, irrationally established or unreasonably located. These problems are summarized according to the principle of information coherence and clearness. Finally, the countermeasures are proposed base on the characteristics of the traffic flows around the Beijing Southern Railway Station and the design principle of traffic signs.

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