作者机构：
[Xie, Meiquan] Cent South Univ Forestry & Technol, Sch Transportat & Logist, Changsha, Hunan, Peoples R China.;[Gill, Gurdiljot Singh; Zhou, Jiao; Jia, Xudong; Cheng, Wen] Calif State Polytech Univ Pomona, Dept Civil Engn, 3801 W Temple Ave, Pomona, CA 91768 USA.;[Choi, Simon] Southern Calif Assoc Govt, Los Angeles, CA USA.
通讯机构：
[Cheng, Wen] C;Calif State Polytech Univ Pomona, Dept Civil Engn, 3801 W Temple Ave, Pomona, CA 91768 USA.
关键词：
Hit-and-run crashes;Bayesian logit model with random effects;sequential logit structure;receiver operating characteristic;real-time loop detector data
摘要：
Objective: Most of the extensive research dedicated to identifying the influential factors of hit-and-run (HR) crashes has utilized typical maximum likelihood estimation binary logit models, and none have employed real-time traffic data. To fill this gap, this study focused on investigating factors contributing to HR crashes, as well as the severity levels of HR.Methods: This study analyzed 4-year crash and real-time loop detector data by employing hierarchical Bayesian models with random effects within a sequential logit structure. In addition to evaluation of the impact of random effects on model fitness and complexity, the prediction capability of the models was examined. Stepwise incremental sensitivity and specificity were calculated and receiver operating characteristic (ROC) curves were utilized to graphically illustrate the predictive performance of the model.Results: Among the real-time flow variables, the average occupancy and speed from the upstream detector were observed to be positively correlated with HR crash possibility. The average upstream speed and speed difference between upstream and downstream speeds were correlated with the occurrence of severe HR crashes. In addition to real-time factors, other variables found influential for HR and severe HR crashes were length of segment, adverse weather conditions, dark lighting conditions with malfunctioning street lights, driving under the influence of alcohol, width of inner shoulder, and nighttime.Conclusions: This study suggests the potential traffic conditions of HR and severe HR occurrence, which refer to relatively congested upstream traffic conditions with high upstream speed and significant speed deviations on long segments. The above findings suggest that traffic enforcement should be directed toward mitigating risky driving under the aforementioned traffic conditions. Moreover, enforcement agencies may employ alcohol checkpoints to counter driving under the influence (DUI) at night. With regard to engineering improvements, wider inner shoulders may be constructed to potentially reduce HR cases and street lights should be installed and maintained in working condition to make roads less prone to such crashes.
摘要：
The improvement of regional eco-efficiency is a significant approach to achieve coordinated development of China's economic development and environmental protection, and an effective environmental regulation system is a crucial driver to the improvement of regional eco-efficiency. Based on the panel data of China's 30 provinces during 2000-2013, this paper divides environmental regulation into three types: command-and-control regulation, market-based regulation and voluntary regulation. STIRPAT model is employed to test the effects of these three environmental regulations on eco-efficiency in the eastern, central and western regions of China. Research results turn out that: (1) in the eastern region, market-based and voluntary environmental regulation have a positive impact on eco-efficiency improvement while command-and-control environmental regulation has no significant impact, and (2) in the central region, command-and-control and market-based environmental regulation can promote eco-efficiency more significantly compared with voluntary environmental regulation, and (3) in the western region, command-and-control environmental regulation plays a positive role in eco-efficiency improvement whilst market-based and voluntary environmental regulation have no significant impacts. These findings indicate that the effects of different types of environmental regulation on eco-efficiency apparently differ in regions. Finally, to optimize and adjust the environmental regulation tools, policy recommendations targeting different regions are concluded. (C) 2016 Elsevier Ltd. All rights reserved.
作者机构：
[Liu, Lijuan; Yin, Zhujia] Changsha Univ Sci & Technol, Sch Econ & Management, Changsha, Hunan, Peoples R China.;[Wang, Haidong] Hunan Univ, Sch Econ Trade, Changsha, Hunan, Peoples R China.;[Wen, Fengming] Cent South Univ Forestry & Technol, Period Soc, Changsha, Hunan, Peoples R China.
通讯机构：
[Wen, Fengming] C;Cent South Univ Forestry & Technol, Period Soc, Changsha, Hunan, Peoples R China.
关键词：
Structure of markets;Decision making;Finance;China;Conflicts of interest;Database and informatics methods;Measurement;Research design
摘要：
Based on the database data of Chinese industrial enterprises from 2000 to 2007 and the LP method, this paper measures the total factor productivity of enterprises and investigates the effect of different mixed ownership forms on enterprises' efficiency and the effect of heterogeneous ownership balance on the mixed ownership enterprises' efficiency. The state-owned enterprise and mixed ownership enterprise are identified by the enterprise's paid-up capital. The results show that, on the whole, for the mixed ownership enterprise, the higher the diversification degree of the shareholders is, the higher the efficiency becomes, and in different types of industries, the mixed forms of shareholders have different effects on the efficiency of enterprises. The heterogeneous ownership balance and the enterprise efficiency show nonlinear U-type relationships. Both the higher and lower heterogeneous ownership balance degrees will promote the enterprise's efficiency. However, when the ownership balance degree is in the range of [0.2 0.5], the increase in ownership balance will lead to the decline of enterprise efficiency. Therefore, when introducing non-state-owned capital, state-owned enterprises should take full account of their own characteristics by rationally controlling the shareholding ratio of non-state-owned capital and play the positive role of a mixed ownership structure in corporate governance with appropriate ownership balances.
期刊：
Transportmetrica A: Transport Science,2018年14(7):615-633 ISSN：2324-9935
通讯作者：
Cheng, Wen
作者机构：
[Gill, Gurdiljot Singh; Zhou, Jiao; Jia, Xudong; Cheng, Wen; Xie, Meiquan] Calif State Polytech Univ Pomona, Dept Civil Engn, 3801 W Temple Ave, Pomona, CA 91768 USA.;[Choi, Simon] Southern Calif Assoc Govt, Los Angeles, CA USA.;[Xie, Meiquan] Cent South Univ Forestry & Technol, Sch Transportat & Logist, Changsha, Hunan, Peoples R China.
通讯机构：
[Cheng, Wen] C;Calif State Polytech Univ Pomona, Dept Civil Engn, 3801 W Temple Ave, Pomona, CA 91768 USA.
关键词：
Serial correlations;time-varying coefficients;autoregressive process;Bayesian hierarchical approach;structural heterogeneities
摘要：
There is relatively little research dedicated to the evaluation of different temporal treatments on modelling performance. This study proposed two new methods which combined the strengths of linear trend and time-varying coefficients with the autoregressive process and compared their performance with seven other temporal models used in the past. All models generated a similar number of statistically significant variables and close variable coefficients, but different modelling performance. For prediction accuracy, the model which accounts only for autoregressive effect illustrated superior performance in terms of cross-validation and typical assessment, which was based on same data used to develop models. Nonetheless, if the penalized criterion was used, both proposed models outperformed other competing models, indicating their capability to yield similar prediction accuracy with relatively smaller effective number of parameters. This suggests further exploration of models that combine various temporal treatments. Finally, the correlations were also observed among the various modelling assessment criteria.
摘要：
Recent volatility in food prices in the grain market has generated much interest among agricultural market participants. This study examines the nonlinear dynamic relationship between spot and futures prices in grain markets. The empirical results provide strong evidence of price asymmetries. The corn spot price adjusts faster to futures price increases than futures price decreases, whereas the soybean spot price adjusts faster to futures price decreases than futures price increases. Although this asymmetric adjustment is found for a single market in Ontario, Canada, the results may also provide insights on the spot-futures price convergence issues in other commodity markets.
期刊：
Journal of Cleaner Production,2018年186:373-387 ISSN：0959-6526
通讯作者：
Yuan, Baolong
作者机构：
[Wang, Qian] Cent South Univ, Sch Business, Changsha 410083, Hunan, Peoples R China.;[Yuan, Baolong] Cent South Univ Forestry & Technol, Sch Business, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Yuan, Baolong] C;Cent South Univ Forestry & Technol, Sch Business, Changsha 410004, Hunan, Peoples R China.
关键词：
Air pollution control intensity;Ecological total-factor energy efficiency;Industrial heterogeneity;Ownership structure
摘要：
To improve China's industrial ecological total-factor energy efficiency is an important issue that attracts widespread attention from researchers and policymakers. This paper uses the panel data of 37 subsectors of China's industrial sector from 2003 to 2014 to examine the influence of air pollution control on ecological total-factor energy efficiency and the moderating effect of ownership structure. Furthermore, based on the intensity of air pollution, the industrial sector is divided into high-polluting industries, medium-polluting industries and low-polluting industries so that the industrial heterogeneity can be analyzed. The results show that, (1) in the short term, air pollution control has a significant inhibiting effect on industrial ecological total-factor energy efficiency. In the long run, the influence of air pollution control on industrial ecological total-factor energy efficiency is significantly heterogeneous. In high-polluting industries, the negative influence of air pollution control on industrial ecological total-factor energy efficiency is not significant, but in medium-polluting industries and low-polluting industries, the negative influence is obvious. (2) State-owned enterprises have a significantly inhibiting effect on industrial ecological total-factor energy efficiency, that is, the expansion of state-owned enterprises will adversely affect industrial energy conservation and emission reduction. (3) Overall, the moderating effect of ownership structure on the relationship between air pollution control and ecological total-factor energy efficiency is not significant. However, for certain industries, the moderating effect of ownership structure is significant. Specifically, the effect is significantly positive in high-polluting industries, significantly negative in medium-polluting industries for a short term, and significantly negative in low-polluting industries for a long term. Finally, this paper puts forward specific policy suggestions.
期刊：
International Journal of Environmental Research and Public Health,2018年15(12) ISSN：1661-7827
通讯作者：
Chen, Xiaoyong;Zhao, Yunlin
作者机构：
[He, Zhengping; Hu, Xinjiang; Zhao, Yunlin; Wu, Yaohui; Chen, Xiaoyong; Zhao, YL; Liu, Wen; Wang, Yonghong] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Zhao, Yunlin; Wu, Yaohui] Cent South Univ Forestry & Technol, Hunan Res Ctr Engn Technol Utilizat Environm & Re, Changsha 410004, Hunan, Peoples R China.;[Chen, Xiaoyong] Governors State Univ, Coll Arts & Sci, University Pk, IL 60484 USA.
通讯机构：
[Chen, XY; Zhao, YL; Zhao, Yunlin] C;[Chen, Xiaoyong] G;Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Hunan Res Ctr Engn Technol Utilizat Environm & Re, Changsha 410004, Hunan, Peoples R China.;Governors State Univ, Coll Arts & Sci, University Pk, IL 60484 USA.
期刊：
Transportation Research Part D-Transport And Environment,2018年60:174-190 ISSN：1361-9209
通讯作者：
Li, Shuangyan
作者机构：
[Zhang, Dezhi; Zhan, Qingwen] Cent S Univ, Sch Traff Transportat Engn, Changsha 410075, Hunan, Peoples R China.;[Chen, Yuche] Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA.;[Li, Shuangyan] Cent South Univ Forestry & Technol, Coll Transportat & Logist, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Li, Shuangyan] C;Cent South Univ Forestry & Technol, Coll Transportat & Logist, Changsha 410004, Hunan, Peoples R China.
关键词：
Regional logistics network;Bi-level model;Logistics infrastructure investment;Subsidies for green transport modes;CO2 emission reduction target
摘要：
This study proposes an optimization model that simultaneously incorporates the selection of logistics infrastructure investments and subsidies for green transport modes to achieve specific CO2 emission targets in a regional logistics network. The proposed model is formulated as a bi-level formulation, in which the upper level determines the optimal selection of logistics infrastructure investments and subsidies for green transport modes such that the benefit–cost ratio of the entire logistics system is maximized. The lower level describes the selected service routes of logistics users. A genetic and Frank–Wolfe hybrid algorithm is introduced to solve the proposed model. The proposed model is applied to the regional logistics network of Changsha City, China. Findings show that using the joint scheme of the selection of logistics infrastructure investments and green subsidies is more effective than using them solely. Carbon emission reduction targets can significantly affect logistics infrastructure investments and subsidy levels.
摘要：
Based on an analysis of the congestion effect and changes in the speed of vehicle flow during morning and evening peaks in a large- or medium-sized city, the piecewise function is used to capture the rules of the time-varying speed of vehicles, which are very important in modelling their fuel consumption and CO2 emission. A joint optimization model of the green vehicle scheduling and routing problem with time-varying speeds is presented in this study. Extra wages during nonworking periods and soft time-window constraints are considered. A heuristic algorithm based on the adaptive large neighborhood search algorithm is also presented. Finally, a numerical simulation example is provided to illustrate the optimization model and its algorithm. Results show that, (1) the shortest route is not necessarily the route that consumes the least energy, (2) the departure time influences the vehicle fuel consumption and CO2 emissions and the optimal departure time saves on fuel consumption and reduces CO2 emissions by up to 5.4%, and (3) extra driver wages have significant effects on routing and departure time slot decisions.
摘要：
The existing literature is limited on the asymmetric relationships between urban tourism attributes and overall satisfaction. To fill this research gap, this study uses the three-factor theory of customer satisfaction to examine the determinants of tourist satisfaction and dissatisfaction with five attributes (i.e., variety, food, and service; urban forests; price; safety, and heritage) in Savannah, GA, based on a sample of 604 tourists. Asymmetric impact-performance analysis (AIPA) and importance-performance analysis (IPA) were made at both the aggregate and segment levels. AIPA results at the aggregate level show that urban forests are classified as an excitement factor, heritage as a performance factor, and the remaining three attributes as basic factors. While IPA patterns are almost the same across segments, AIPA patterns show more variations than similarities, suggesting AIPA is more efficient than IPA to determine areas where different management strategies are needed. Methodological and managerial implications are discussed.
