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Zhang H.-J.,Beijing Institute of Technology | Zhang H.-J.,Civil Aviation Engineering Consulting Company of China | Zhang Q.,Beijing Institute of Technology
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2010

Under the assumption that the domain of the undetermined parameters can vary is known, the existence of simple Berge equilibrium for non-cooperative games is investigated. Based on the concept of simple Berge equilibrium and NS-equilibrium introduced by Zhukovskii for non-cooperative games, the notions of Pareto simple Berge equilibrium (PSBE) and Weak Pareto simple Berge equilibrium (WPSBE) are defined, and theorems of existence of the equilibrium are also provided by means of the Ky Fan inequality. Finally, a numeric example is raised to illustrate the proposed method's feasibility. Source

Wang F.,Jackson State University | Bu L.,Jackson State University | Li C.,Civil Aviation Engineering Consulting Company of China | Rong J.,Beijing University of Technology | Guo R.,Tsinghua University
Transportation Research Record | Year: 2014

Emergency evacuation traffic is simulated in response to an assumed chlorine gas spill incident in downtown Jackson, Mississippi. The best evacuation corridors are identified, and possible effective traffic management strategies are compared to increase the cumulative number of vehicles evacuated out of the protective action zone and to decrease the average travel times for evacuees. To relieve the heavy traffic congestion around the spill location caused by the sudden increase in demand, traffic management strategies (law enforcement for traffic control, contraflow oPerations, and variable message signs) are tested on the three major arterial streets in the protective action zone to improve evacuation performance over a baseline traffic management strategy. A multiway analysis of variance was conducted for the simulation results to numerically assess the effect of each factor that might contribute to the performance of the short-notice evacuation. Results of a comparison of evacuation scenarios used to determine evacuation effectiveness and statistical analysis indicated that (a) selection of a best contraflow operation route depends on interference from intersecting links and the cost of deploying traffic management and (b) the use of both contraflow and variable message sigas could improve evacuation performance over using neither or only one of the two strategies. Source

Tan H.,Beijing Institute of Technology | Feng J.,CAS Institute of Automation | Feng G.,Civil Aviation Engineering Consulting Company of China | Wang W.,Beijing Institute of Technology | Zhang Y.-J.,Tsinghua University
Mathematical Problems in Engineering | Year: 2013

Traffic volume data is already collected and used for a variety of purposes in intelligent transportation system (ITS). However, the collected data might be abnormal due to the problem of outlier data caused by malfunctions in data collection and record systems. To fully analyze and operate the collected data, it is necessary to develop a validate method for addressing the outlier data. Many existing algorithms have studied the problem of outlier recovery based on the time series methods. In this paper, a multiway tensor model is proposed for constructing the traffic volume data based on the intrinsic multilinear correlations, such as day to day and hour to hour. Then, a novel tensor recovery method, called ADMM-TR, is proposed for recovering outlier data of traffic volume data. The proposed method is evaluated on synthetic data and real world traffic volume data. Experimental results demonstrate the practicability, effectiveness, and advantage of the proposed method, especially for the real world traffic volume data. © 2013 Huachun Tan et al. Source

Luo Y.-Z.,Zhejiang University | Sun B.,Zhejiang University | Sun B.,Civil Aviation Engineering Consulting Company of China | Hong J.-B.,Hanjia design group Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

Wind tunnel tests in smooth and turbulent flows with and without a building were performed to detect static pressure fields here. A dimensionless method was proposed to solve a problem that static pressures could hardly be measured exactly, therefore the distributions of static pressure fields were investigated, dynamic characteristics of different flow areas around a building were analyzed in details with amplitude domain and frequency domain analysis methods, distribution function formulas of a static pressure field in main directions were given, and then its static and dynamic boundaries were figured out. The study results indicated that the natural vibration modes of a gas column in the wind tunnel may be evidently excited in some conditions and then the test results may be misled; the pressure fluctuating in the windward area of a building depends on the velocity fluctuating of an approach flow; the pressure fluctuating in the leeward area is close to the static pressure fluctuating of a turbulent approach flow but there are more non-Gaussian characteristics in the leeward area; a periodic vibration with a small amplitude of static pressure turns to a random vibration with a larger amplitude in the crosswind area with surface roughness rising; the more rough the surface, the smaller the static force action but the bigger the dynamic action of the whole static pressure field. The proposed distribution function formulas could be used for many purposes, such as, measuring a reference static pressure in full-scale filed tests and investigating a wind-induced interference effect among buildings. Source

Zhang Y.,Changan University | Guo Q.,Civil Aviation Engineering Consulting Company of China | Ji X.,Changan University
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2016

The sodium silicate, organic silicone resin and silane coupling agent were used to enhance the performances of recycled aggregate(RA). The performances of RAs with and without enhancement were investigated, including crushing value, abrasion value, water absorption and adhesion in order to select out the best enhancer. The surface microscopic morphology of RAs with and without enhancement was observed by SEM and further the enhancing mechanism of enhancer on RA was investigated. The recycled coarse aggregate and natural fine aggregate were used to make up asphalt treated recycled aggregate(ATRA), and laboratory experiments were conducted including rutting test, water stability test and low-temperature bending test, and then the road performances of ATRAs were investigated. The results show that RA has large crushing value, abrasion value and water absorption and poor adhesion due to the voids and micro-cracks that exist in RA. The enhancing effect of organic silicone resin on comprehensive performances of RA is superior over that of sodium silicate and silane coupling agent. Most voids in RA are effectively blocked and micro-cracks are repaired in a certain extent when RA is enhanced by organic silicone resin, and the anti-crushed and adhesion of RA are improved and the water absorption of RA is reduced. When the RA without enhancement is used in ATRA, the average bending strain, residual stability and freeze-thaw splitting strength ratio of ATRA can't meet the requirements of JTG F40-2004. Moreover, When the RA enhanced by 2%(by mass) organic silicone resin is used in ATRA, the road performances of ATRA can be greatly improved and meet regulatory requirements of JTG F40-2004. © 2016, Editorial Department of Journal of Building Materials. All right reserved. Source

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