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Chunchao C.,China Academy of Transportation Science
Proceedings - 2015 International Conference on Control, Automation and Robotics, ICCAR 2015 | Year: 2015

Toll expressway financial risk problem is being paid more and more attention nowadays, because which may induce local government debt risks. This paper focuses on the issues about toll expressway financial risk, and presents a set of monitoring, analyzing and management solution. At first, toll expressway financial risk indexes were designed, which considered not only the current but also the potential solvency about the payment ability of each toll expressway project. Secondly, four risk levels and alerting values were defined by means of those indexes estimation. Meanwhile, corresponding actions were suggested according to risk levels. Thirdly, the decision support system (DSS) was developed on toll expressway financial risk monitoring, and a case study was conducted as well. In the case study, the financial risk level of each project was easily identified by different colors, such as red standing for serious situation. The research achievements provide technical supports and decision-making references for monitoring financial risks of toll expressway projects. © 2015 IEEE. Source


Chu C.C.,China Academy of Transportation Science
Advances in Energy Science and Equipment Engineering - Proceedings of International Conference on Energy Equipment Science and Engineering, ICEESE 2015 | Year: 2015

This paper focused on the issues of estimating the commercial vehicles emission amount and atmospheric pollution cost in China. At first, the model of vehicle emission was presented based on the affecting factors analysis method. Three aspects, the motor vehicle’s quantity of different type, the annual average operation miles and the main pollutant emission, were considered affecting factors. Secondly, the marginal cost of each pollutant was quantitatively evaluated by contrast to the IMPACT studied results, which considered not only the per capita GDP difference between China and the EU but also the GDP growth in China. Finally, the commercial vehicles pollutant cost estimation model was established which combined emission with pollutant marginal cost. As an example, the commercial vehicle emission and pollutant cost from 2009 to 2013 in China were calculated to confirm the presented model. The results showed that the commercial vehicle total emission and pollutant cost is gradually reducing; the trend is more obvious from the results of unit turnover in China. © 2015 Taylor & Francis Group, London. Source


Sun G.-X.,CAS Research Center for Eco Environmental Sciences | Wang X.-J.,China Academy of Transportation Science | Hu Q.-H.,University of Texas at Arlington
Environmental Pollution | Year: 2011

Lead isotopes and heavy metal concentrations were measured in two sediment cores sampled in estuaries of Xiangjiang and Lishui Rivers in Hunan province, China. The presence of anthropogenic contribution was observed in both sediments, especially in Xiangjiang sediment. In the Xiangjiang sediment, the lower 206Pb/ 207Pb and higher 208Pb/ 206Pb ratio, than natural Pb isotope signature (1.198 and 2.075 for 206Pb/ 207Pb and 208Pb/ 206Pb, respectively), indicated a significant input of non-indigenous Pb with low 206Pb/ 207Pb and high 208Pb/ 206Pb. The corresponding concentrations of heavy metals (As, Cd, Zn, Mn and Pb) were much higher than natural values, suggesting the contaminations of heavy metals from extensive ore-mining activities in the region. © 2011 Elsevier Ltd. All rights reserved. Source


Wang Q.,Harbin Institute of Technology | Wu C.,Harbin Institute of Technology | Sun Y.,China Academy of Transportation Science
Journal of Air Transport Management | Year: 2015

This paper applies entropy weight and grey relation analysis to evaluate corporate social responsibility (CSR) performance of eight Chinese major airlines. This paper intends to achieve two main aims. First, this study uses entropy to find the relative weights of performance measures of CSR. In so doing, we find that on-time performance, accident rate, flight frequency, growth of employees revenue, and employees revenue are relatively most important measures. Second, based on the results of entropy analysis, this study ranks the airlines in terms of CSR performance by grey relation analysis. This result shows that most of the larger state-controlled airlines perform better in performance of CSR. Furthermore, the private airline has made relatively large improvement in its CSR performance. In addition, the listed airlines are better than non-listed airlines in CSR performance. © 2014 Elsevier Ltd. Source


Hu J.-B.,Beijing University of Technology | Li R.,China Academy of Transportation Science | Ma Y.,Changan University
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2014

In order to achieve energy saving and low carbon tunnel lighting conditions with safety considered, the driver visual request characteristics and the influence of tunnel entrance section lighting on changing rate of driver's pupil were analyzed. By experiment designing, typical vehicles were chosen for real vehicle testing with a random sample of 24 drivers on tunnel entrance section of the mountainous expressway and tested data were collected and analyzed. The changing rate of pupil was selected as the evaluation index to evaluate the driving safety and comfort of tunnel entrance section lighting. The logistic regression model of changing rate of driver's pupil, luminance reduction coefficient and vehicle operation speed was established. The changing rate of pupil which could be used to describe driving tension degree and changing rate of pupil (20%) for safety and comfort threshold the safety and comfort threshold were put in the logistic regression model for verification. The results show that the safety and comfort luminance reduction coefficient of tunnel entrance section with a speed limit of 60 km·h-1 is 0.028 which is higher than current standard specification. The research method and conclusions can provide theory, method and practice value for the expressway tunnel lighting design and operation management at the tunnel entrance section. Source

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