|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 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 | Rule-based Fault Diagnosis of Hall Sensors and Fault-tolerant Control of PMSM显示文摘Hall sensor is widely used for estimating rotor phase of permanent magnet synchronous motor(PMSM). And rotor position is an essential parameter of PMSM control algorithm, hence it is very dangerous if Hall senor faults occur. But there is scarcely any research focusing on fault diagnosis and fault-tolerant control of Hall sensor used in PMSM. From this standpoint, the Hall sensor faults which may occur during the PMSM operating are theoretically analyzed. According to the analysis results, the fault diagnosis algorithm of Hall sensor, which is based on three rules, is proposed to classify the fault phenomena accurately. The rotor phase estimation algorithms, based on one or two Hall sensor(s), are initialized to engender the fault-tolerant control algorithm. The fault diagnosis algorithm can detect 60 Hall fault phenomena in total as well as all detections can be fulfilled in 1/138 rotor rotation period. The fault-tolerant control algorithm can achieve a smooth torque production which means the same control effect as normal control mode (with three Hall sensors). Finally, the PMSM bench test verifies the accuracy and rapidity of fault diagnosis and fault-tolerant control strategies. The fault diagnosis algorithm can detect all Hall sensor faults promptly and fault-tolerant control algorithm allows the PMSM to face failure conditions of one or two Hall sensor(s). In addition, the transitions between health-control and fault-tolerant control conditions are smooth without any additional noise and harshness. Proposed algorithms can deal with the Hall sensor faults of PMSM in real applications, and can be provided to realize the fault diagnosis and fault-tolerant control of PMSM. | SONG Ziyou LI Jianqiu OUYANG Minggao GU Jing FENG Xuning LU Dongbin | 2013 | Chinese Journal of Mechanical Engineering2013，26，4： | 12 |
| 4 | 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 |
| 5 | 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 |
| 6 | 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 |
| 7 | Interaction of In-wheel Permanent Magnet Synchronous Motor with Tire Dynamics显示文摘Drive wheel systems combined with the in-wheel permanent magnet synchronous motor(I-PMSM) and the tire are highly electromechanical-coupled. However, the deformation dynamics of this system, which may influence the system performance, is neglected in most existing literatures. For this reason, a deformable tire and a detailed I-PMSM are modeled using Matlab/Simulink. Furthermore, the influence of tire/road contact interface is accurately described by the non-linear relaxation length-based model and magic formula pragmatic model. The drive wheel model used in this paper is closer to that of a real tire in contrast to the rigid tire model which is widely used. Based on the near-precise model mentioned above, the sensitivity of the dynamic tire and I-PMSM parameters to the relative error of slip ratio estimation is analyzed. Additionally, the torsional and longitudinal vibrations of the drive wheel are presented both in time and frequency domains when a quarter vehicle is started under conditions of a specific torque curve, which includes an abrupt torque change from 30 N·m to 200 N·m. The parameters sensitivity on drive wheel vibrations is also studied, and the parameters include the mass distribution ratio of tire, the tire torsional stiffness, the tire damping coefficient, and the hysteresis band of the PMSM current control algorithm. Finally, different target torque curves are compared in the simulation, which shows that the estimation error of the slip ratio gets violent, and the longitudinal force includes more fluctuation components with the increasing change rate of the torque. This paper analyzes the influence of the drive wheel deformation on the vehicle dynamic control, and provides useful information regarding the electric vehicle traction control. | SONG Ziyou LI Jianqiu WEI Yintao XU Liangfei OUYANG Minggao | 2015 | Chinese Journal of Mechanical Engineering2015，28，3： | 7 |
| 8 | 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 |
| 9 | 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 |
| 10 | N^6-Methyladenosine modification: a novel pharmacological target for anti-cancer drug development显示文摘N6-Methyladenosine(m6 A) modification is the most pervasive modification of human mRNA molecules. It is reversible via regulation of m6 A modification methyltransferase, demethylase and proteins that preferentially recognize m6 A modification as 'writers', 'erasers' and 'readers', respectively. Altered expression levels of the m6 A modification key regulators substantially affect their function, leading to significant phenotype changes in the cell and organism. Recent studies have proved that the m6 A modification plays significant roles in regulation of metabolism, stem cell self-renewal, and metastasis in a variety of human cancers. In this review, we describe the potential roles of m6 A modification in human cancers and summarize their underlying molecular mechanisms. Moreover, we will highlight potential therapeutic approaches by targeting the key m6 A modification regulators for cancer drug development.& 2018 Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license(http://creativecommons.org/licenses/by-nc-nd/4.0/). | Yi Niu Arabella Wan Ziyou Lin Xiongbin Lu Guohui Wan | 2018 | Acta Pharmaceutica Sinica B2018，8，6： | 5 |
| 11 | Progress review of US-China joint research on advanced technologies for plug-in electric vehicles显示文摘The United States and China are the world's largest automobile markets and oil consumers, and both face a severe challenge to conserve energy and reduce tailpipe emissions. Thus, both countries urgently need to transform conventional internal combustion engines to electrified powertrains. Targeting the advanced core technologies of plug-in electric vehicles(PEVs), a joint research collaboration between China and the US, called the 'Clean Vehicle Consortium'(CVC), was set up in 2010. Six years of collaboration on PEV technologies has resulted in significant progress in three technical areas. Based on CVC publications,we review herein the progress made by the CVC research efforts on three key advanced PEV technologies. This includes the development of a safe battery with an energy density of 260 W h kg^(-1) and a systematic method for designing safe traction battery systems. Thus, a breakthrough in high power density and efficient traction motor systems has occurred. In addition to discussing advanced electric-drive powertrains, we also discuss global energy management strategies that aim to improve PEV energy efficiency. This discussion covers scientific and comprehensive analysis methods to analyze energy systems, which include costbenefit analyses of plug-in hybrid electric vehicles, life-cycle assessments for evaluating vehicle emissions, and PEV-ownership projections. | OUYANG MingGao DU JiuYu PENG Huei WANG HeWu FENG XuNing SONG ZiYou | 2018 | Science China(Technological Sciences)2018，61，10： | 5 |
| 12 | 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 |
| 13 | 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 |
| 14 | 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 |
| 15 | Influence of Tire Dynamics on Slip Ratio Estimation of Independent Driving Wheel System显示文摘The independent driving wheel system, which is composed of in-wheel permanent magnet synchronous motor(I-PMSM) and tire, is more convenient to estimate the slip ratio because the rotary speed of the rotor can be accurately measured. However, the ring speed of the tire ring doesn't equal to the rotor speed considering the tire deformation. For this reason, a deformable tire and a detailed I-PMSM are modeled by using Matlab/Simulink. Moreover, the tire/road contact interface(a slippery road) is accurately described by the non-linear relaxation length-based model and the Magic Formula pragmatic model. Based on the relatively accurate model, the error of slip ratio estimated by the rotor rotary speed is analyzed in both time and frequency domains when a quarter car is started by the I-PMSM with a definite target torque input curve. In addition, the natural frequencies(NFs) of the driving wheel system with variable parameters are illustrated to present the relationship between the slip ratio estimation error and the NF. According to this relationship, a low-pass filter, whose cut-off frequency corresponds to the NF, is proposed to eliminate the error in the estimated slip ratio. The analysis, concerning the effect of the driving wheel parameters and road conditions on slip ratio estimation, shows that the peak estimation error can be reduced up to 75% when the LPF is adopted. The robustness and effectiveness of the LPF are therefore validated. This paper builds up the deformable tire model and the detailed I-PMSM models, and analyzes the effect of the driving wheel parameters and road conditions on slip ratio estimation. | LI Jianqiu SONG Ziyou WEI Yintao OUYANG Minggao | 2014 | Chinese Journal of Mechanical Engineering2014，27，6： | 4 |
| 16 | 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 |
| 17 | BILEVEL PROGRAMMING MODEL AND SOLUTION METHOD FOR MIXED TRANSPORTATION NETWORK DESIGN PROBLEM显示文摘By handling the travel cost function artfully,the authors formulate the transportationmixed network design problem (MNDP) as a mixed-integer,nonlinear bilevel programming problem,in which the lower-level problem,comparing with that of conventional bilevel DNDP models,is nota side constrained user equilibrium assignment problem,but a standard user equilibrium assignmentproblem.Then,the bilevel programming model for MNDP is reformulated as a continuous version ofbilevel programming problem by the continuation method.By virtue of the optimal-value function,the lower-level assignment problem can be expressed as a nonlinear equality constraint.Therefore,thebilevel programming model for MNDP can be transformed into an equivalent single-level optimizationproblem.By exploring the inherent nature of the MNDP,the optimal-value function for the lower-level equilibrium assignment problem is proved to be continuously differentiable and its functionalvalue and gradient can be obtained efficiently.Thus,a continuously differentiable but still nonconvexoptimization formulation of the MNDP is created,and then a locally convergent algorithm is proposedby applying penalty function method.The inner loop of solving the subproblem is mainly to implementan all-or-nothing assignment.Finally,a small-scale transportation network and a large-scale networkare presented to verify the proposed model and algorithm. | Haozhi ZHANG·Ziyou GAOSchool of Traffic and Transportation,Beijing Jiaotong University,Beijing 100044,China China Urban SustainableTransport Research Centre,China Academy of Transportation Sciences,Beijing 100029,China. | 2009 | Journal of Systems Science & Complexity2009，22，3： | 4 |
| 18 | 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 |
| 19 | Tunable photonic crystals based on ferroelectric and ferromagnetic materials by focused ion beam显示文摘By making photonic crystals in ferroelectric and ferromagnetic materials,field-provoked tunability of photonic crystals is broadening the interest in new applications of on-chip photonic devices.We report a nano-precise fabrication of various designs of photonic crystals in these non-conventional materials using the focused ion beam milling technique.Standard methods are developed and parameters for different materials are calibrated.Optical responses such as bandgaps and polarization status changing from planar film waveguide system with these patterns have been examined on ferromagnetic materials. | Ziyou Zhou Xiaoyue Huang Raghav Vanga Rong Li | 2007 | Chinese Optics Letters2007，5，12： | 3 |
| 20 | 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 |
您所在的机构暂未开通此部分的功能，请联系管理员