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| 1 | Urban traffic congestion propagation and bottleneck identification显示文摘Bottlenecks in urban traffic network are sticking points in restricting network collectivity traffic efficiency. To identify network bottlenecks effectively is a foundational work for improving network traffic condition and preventing traffic congestion. In this paper, a congestion propagation model of urban network traffic is proposed based on the cell transmission model (CTM). The proposed model includes a link model, which describes flow propagation on links, and a node model, which represents link-to-link flow propagation. A new method of estimating average journey velocity (AJV) of both link and network is developed to identify network congestion bottlenecks. A numerical example is studied in Sioux Falls urban traffic network. The proposed model is employed in simulating network traffic propagation and congestion bottleneck identification under different traffic demands. The simulation results show that continual increase of traffic demand is an immediate factor in network congestion bottleneck emergence and increase as well as reducing network collectivity capability. Whether a particular link will become a bottleneck is mainly determined by its position in network, its traffic flow (attributed to different OD pairs) component, and network traffic demand. | LONG JianCheng GAO ZiYou REN HuaLing LIAN AiPing | 2008 | Science in China(Series F)2008，51，7： | 25 |
| 2 | Optimization model and algorithm for mixed traffic of urban road network with flow interference显示文摘In this paper,the problem of interferences between motors and non-motors in urban road mixed traffic network is considered and the corresponding link impedance function is presented based on travel demand.On the base of this,the main factors that influence travelers' traffic choices are all considered and a combined model including flow-split and assignment problem is proposed.Then a bilevel model with its algorithm for system optimization of urban road mixed traffic network is proposed.Finally the application of the model and its algorithm is illus-trated with a numerical example. | SI BingFeng,LONG JianCeng & GAO ZiYou State Key Laboratory of Rail Traffic Control and Safety,Beijing Jiaotong University,Beijing 100044,China | 2008 | Science China(Technological Sciences)2008，51，12： | 13 |
| 3 | Continuum modeling for two-lane traffic flow显示文摘在这篇论文,我们学习为二小巷的马路交通动力学当模特儿的连续统。一个新动力学模型被建议,它包含基于坡度的动量方程从适合到二小巷的交通流动的一个汽车追随者理论导出的速度。为固定新模型的线性稳定性的条件被介绍。数字测试被执行并且一些非,平衡现象被观察定期而不断被迫停的波浪,本地簇和阶段例如小骚乱不稳定性,转移。 | Haijun Huang Tieqiao Tang Ziyou Gao | 2006 | Acta Mechanica Sinica2006，22，2： | 10 |
| 4 | Impacts of variable message signs on traffic congestion显示文摘The variable message signs (VMS) have been widely used in guiding and managing the dynamic traffic with development of intelligent transportation technologies. It is known that cell transmission model (CTM) can well reproduce such traffic dynamics as shock waves and jams. This paper presents a new method to estimate the route travel times by using the CTM in conjunction with a logit-based route choice rule. The impacts of VMS on a two-route scenario with recurrent and non-recurrent traffic congestion are numerically investigated by analyzing the changes of route flow and travel time. Simulation results show that in networks with suitable long links, the VMS can positively influence travelers' decision making so as to improve the system performance. For non-recurrent congestion, the value space of the route choice parameter that affects the flow distribution between two routes is narrower in the case of high traffic demand than that in the low demand case. | SHANG HuaYan HUANG HaiJun GAO ZiYou | 2009 | Science China(Technological Sciences)2009，52，2： | 9 |
| 5 | URBAN TRANSIT ASSIGNMENT MODEL BASED ON AUGMENTED NETWORK WITH IN-VEHICLE CONGESTION AND TRANSFER CONGESTION显示文摘This paper presents an augmented network model to represent urban transit system.Through such network model,the urban transit assignment problem can be easily modeled like a generalized traffic network.Simultaneously,the feasible route in such augmented transit network is then defined in accordance with the passengers' behaviors.The passengers' travel costs including walking time,waiting time,in-vehicle time and transfer time are formulated while the congestions at stations and the congestions in transit vehicles are all taken into account.On the base of these,an equilibrium model for urban transit assignment problem is presented and an improved shortest path method based algorithm is also proposed to solve it.Finally,a numerical example is provided to illustrate our approach. | Bingfeng SI Ming ZHONG Xiaobao YANG Ziyou GAO | 2011 | Journal of Systems Science and Systems Engineering2011，20，2： | 8 |
| 6 | Variations in stem radii of Larix principis-rupprechtii to environmental factors at two slope locations in the Liupan Mountains,northwest China显示文摘Relationships between stem growth and climatic and edaphic factors,notably air temperatures and soil moisture for different slopes,are not completely understood.Stem radial variations were monitored at the bottom and top slope positions in a Larix principis-rupprechtii plantation during the 2017 and 2018 growing seasons.Total precipitation during the growing season in 2017 and 2018 was 566 mm and 728 mm,respectively.Stem contractions typically occurred after mid-morning followed by swelling in the late afternoon in both plots,reflecting the diurnal cycle of water uptake and loss.Trees at the two locations showed the same growth initiation(mid-May)because of the small differences in air and soil temperatures.There were no significant differences in cumulative stem radial growth between the bottom plot(1.57±0.34 mm)and the top plot(1.55±0.26 mm)in 2018.However,in 2017,the main growth period of the bottom plot ceased 17 days earlier than in the top plot,while cumulative seasonal growth of the bottom plot(1.08±0.25 mm)was significantly less than the top plot(1.54±0.43 mm).Maximum daily stem shrinkage was positively correlated with air and soil temperatures,solar radiation,vapor pressure deficits,and negatively correlated with volumetric soil moisture content.The maximum daily shrinkage reflected transpiration rates as affected by environmental factors.Daily radial stem increment was correlated with precipitation and volumetric soil moisture in both years,but with air temperatures only in 2017.The seasonal growth of L.principis-rupprechtii Mayr thus shows interannual dynamics,while precipitation constitutes a key driving factor. | Jing Ma Jianbin Guo Yanhui Wang Zebin Liu Di Gao Liu Hong Ziyou Zhang | 2021 | Journal of Forestry Research2021，32，2： | 6 |
| 7 | Modeling and simulation for train control system using cellular automata显示文摘Train control system plays a key role in railway traffic. Its function is to manage and control the train movement on railway networks. In our previous works, based on the cellular automata (CA) model, we proposed several models and algorithms for simulating the train movement under different control system conditions. However, these models are only suitable for some simple traffic conditions. Some basic fac- tors, which are important for train movement, are not considered. In this paper, we extend these models and algorithms and give a unified formula. Using the pro- posed method, we analyze and discuss the space-time diagram of railway traffic flow and the trajectories of the train movement. The numerical simulation and analytical results demonstrate that the unified CA model is an effective tool for simulating the train control system. | LI KePing GAO ZiYou YANG LiXing | 2007 | Science China(Technological Sciences)2007，50，6： | 6 |
| 8 | CHARGING STATION PLANNING FOR PLUG-IN ELECTRIC VEHICLES显示文摘为计划插件的问题的收费车站的一个新奇模型考虑到用户每天旅行,电的车辆在这份报纸被建议。与最小化全部的费用的目的,包括收费,车站花费了(包括安装,费用和管理花费了)并且用户花费了(包括车站存取费用和收费费用),建议模型同时处理这些问题在哪儿并且多少定位收费车站在各收费要证实的充电器驻扎。就那而言,不同用户可以有车站存取费用和收费费用的不同感觉,二个案例(即,同类的用户和异构的用户) 典型地被调查。不同贴现率,收费车站的操作时期,电的车辆的数字和在收费车站的地点上控告车站的数字的影响也被学习。模拟结果不仅证明根据用户的旅行行为定位收费车站是很重要的,而且验证建议模型的有效性。 | Zhihong Zhu Ziyou Gao Jianfeng Zheng Haoming Du | 2018 | Journal of Systems Science and Systems Engineering2018，27，1： | 4 |
| 9 | Incident-based traffic congestion control strategy显示文摘Traffic incident happens frequently in urban traffic network and it affects normal operation of traffic system seriously so that study on incident-based congestion control strategies is very important. This study addresses the problem of the temporary vehicle movement bans design under incident-based traffic congestion situation. A bi-level programming model is proposed to formulate this problem. The upper level problem is to minimize the total travel cost in the view of traffic management agencies, and the lower level problem is to present travelers’ dynamic route choice behavior under temporary vehicle movement bans using the simulation of cell transmission model, then a genetic algorithm is employed to solve the proposed bi-level programming model. Computational results show that the temporary vehicle movement bans measure is able to alleviate the traffic network incident-based congestion effectively and improve system performance of traffic network. | ZHANG AoMuHan GAO ZiYou REN HuaLing | 2011 | Science China(Technological Sciences)2011，54，5： | 4 |
| 10 | TWO-WAY ROAD NETWORK DESIGN PROBLEM WITH VARIABLE LANES显示文摘 | Haozhi ZHANG Ziyou GAO | 2007 | Journal of Systems Science and Systems Engineering2007，16，1： | 4 |
| 11 | Car capacity near bus stops with mixed traffic derived by additive-conflict-flows procedure显示文摘To determinate car capacity at bus stops with mixed traffic, a new theoretical approach was developed on the basis of additive-conflict-flows procedure. The procedure was extended from homogeneous traffic flow to mixed traffic flow. The conflicts among cars, buses and bicycles near the stop can be described by the extended procedure. The procedure can be understood more easily than the theory of gap acceptance. Car capacity near the stop is the function of both bus stream and bicycle stream. The proposed model can also analyze the cases of pedestrian effects and limited priority of bicyclists. Numerical results show that the car capacity decreases with the increasing flow rates of other streams. In addition, pedestrian effects and bicyclist's limited priority have negative effects on car capacity near bus stops with mixed traffic flow. | YANG XiaoBao GAO ZiYou SI BingFeng Gao Liang | 2011 | Science China(Technological Sciences)2011，54，3： | 4 |
| 12 | Equilibrium model and algorithm of urban transit assignment based on augmented network显示文摘The passenger flow assignment problem for the urban transit network is relatively complicated due to the complexity of the network structure and many factors influencing the passengers' route and line choices. In the past three decades, many models have been proposed to solve the passenger flow assignment problem. However, the common-line problem remains challenging in transit flow assignment. In this paper, the characteristics of the urban transit network is analysed and a new technique of augmented network is proposed to represent the urban transit system. The purpose is to eliminate the complex common-line problem when modeling transit passenger flow assignment. Through this augmentation technique, the urban transit system can be represented by an augmented network-it then behaves like a simple network and can be used as a generalized network for traffic assignment or network analysis. This paper presents a user equilibrium model for the urban transit assignment problem based on such a technique. A numerical example is also provided to illustrate the approach. | SI BingFeng ZHONG Ming SUN HuiJun GAO ZiYou | 2009 | Science China(Technological Sciences)2009，52，11： | 3 |
| 13 | Robust train speed trajectory optimization: A stochastic constrained shortest path approach显示文摘Train speed trajectory optimization is a significant issue in railway traffic systems, and it plays a key role in determining energy consumption and travel time of trains. Due to the complexity of real-world operational environments, a variety of factors can lead to the uncertainty in energy-consumption. To appropriately characterize the uncertainties and generate a robust speed trajectory, this study specifically proposes distance-speed networks over the inter-station and treats the uncertainty with respect to energy consumption as discrete samplebased random variables with correlation. The problem of interest is formulated as a stochastic constrained shortest path problem with travel time threshold constraints in which the expected total energy consumption is treated as the evaluation index. To generate an approximate optimal solution, a Lagrangian relaxation algorithm combined with dynamic programming algorithm is proposed to solve the optimal solutions. Numerical examples are implemented and analyzed to demonstrate the performance of proposed approaches. | Li WANG Lixing YANG Ziyou GAO Yeran HUANG | 2017 | Frontiers of Engineering Management2017，4，4： | 3 |
| 14 | Survival analysis of car travel time near a bus stop in developing countries显示文摘This paper presents an important investigation into car travel time affected by mixed traffic flow near a bus stop on the basis of survival analysis theory.Travel time data associated with mixed traffic characteristics near a bus stop were collected by video cameras.A hazard-based duration model was introduced to analyze the effects of mixed traffic flow on car travel time.The results indicate that mixed traffic flow impacts car travel time significantly.And the presence of bus berthing violation would delay car travel time.The proposed model can be used to forecast temporal shifts in car travel time due to changes in mixed traffic flow.The influential factors related to mixed traffic flow should be given full consideration in the planning and designing of bus stops in developing countries. | YANG XiaoBao GAO ZiYou GUO HongWei HUAN Mei | 2012 | Science China(Technological Sciences)2012，55，8： | 3 |
| 15 | Effects of conservation tillage practices on winter wheat water-use efficiency and crop yield on the Loess Plateau, China显示文摘 | Ziyou Su Jinsong Zhang Wenliang Wu Dianxiong Cai Junjie Lv Guanghui Jiang Jian Huang Jun Gao Roger Hartmann Donald Gabriels | 2006 | Agricultural Water Management2006，，3： | 2 |
| 16 | Topological-based bottleneck analysis and improvement strategies for traffic networks显示文摘A method is proposed to find key components of traffic networks with homogenous and heterogeneous topologies, in which heavier traffic flow is transported. One component, called the skeleton, is the minimum spanning tree (MST) based on the zero flow cost (ZCMST). The other component is the infinite incipient percolation cluster (IIC) which represents the spine of the traffic network. Then, a new method to analysis the property of the bottleneck in a large scale traffic network is given from a macroscopic and statistical viewpoint. Moreover, three effective strategies are proposed to alleviate traffic congestion. The significance of the findings is that one can significantly improve the global transport by enhancing the capacity in the ZCMST with a few links, while for improving the local traffic property, improving a tiny fraction of the traffic network in the IIC is effective. The result can be used to help traffic managers prevent and alleviate traffic congestion in time, guard against the formation of congestion bottleneck, and make appropriate policies for traffic demand management. Meanwhile, the method has very important theoretical significance and practical worthiness in optimizing traffic organization, traffic control, and disposal of emergency. | JianJun Wu ZiYou Gao HuiJun Sun | 2009 | Science China(Technological Sciences)2009，52，10： | 2 |
| 17 | Energy-saving operation approaches for urban rail transit systems显示文摘With the accelerated urbanization in China, passenger demand has dramatically increased in large cities, and traffic congestion has become serious in recent years. Developing public urban rail transit systems is an indispensable approach to overcome these problems. However, the high energy consumption of daily operations is an emerging issue due to increased rail transit networks and passenger demands. Thus, reducing the energy consumption and operational cost by using advanced optimization methodologies is an urgent task for operation managers. This work systematically introduces energysaving approaches for urban rail transit systems in three aspects, namely, train speed profile optimization, utilization of regenerative energy, and integrated optimization of train timetable and speed profile. Future research directions in this field are also proposed to meet increasing passenger demands and network?based urban rail transit systems. | Ziyou GAO Lixing YANG | 2019 | Frontiers of Engineering Management2019，6，2： | 2 |
| 18 | Solving the constrained shortest path problem using random search strategy显示文摘In this paper, we propose an improved walk search strategy to solve the constrained shortest path problem. The proposed search strategy is a local search algorithm which explores a network by walker navigating through the network. In order to analyze and evaluate the proposed search strategy, we present the results of three computational studies in which the proposed search algorithm is tested. Moreover, we compare the proposed algorithm with the ant colony algorithm and k shortest paths algorithm. The analysis and comparison results demonstrate that the proposed algorithm is an effective tool for solving the constrained shortest path problem. It can not only be used to solve the optimization problem on a larger network, but also is superior to the ant colony algorithm in terms of the solution time and optimal paths. | LI KePing, GAO ZiYou , TANG Tao & YANG LiXing State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China | 2010 | Science China(Technological Sciences)2010，53，12： | 1 |
| 19 | Cascades in small-world modular networks with CMLS method显示文摘 | CUI DI GAO ZIYOU ZHAO XIAOMEI | 2007 | Modern Physics Letters B2007，21，30： | 1 |
| 20 | Solution Algorithm for the Bi-level Discrete Network Design Probelem 显示文摘 | GAO Ziyou WU Jianjun SUN Huijun | 2005 | Transportation Research Part B2005，39，： | 1 |
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