摘要：
The loading outline of railway out-of-gauge freight (ROF) is beyond the railway gauge due to its larger size. The choice of a safe and economical transportation route according to the characteristics of the freights in the railway network becomes an important issue for the railway out-of-gauge freight transportation. A proposed methodology is presented in this paper with the aim to solve the problems in the railway out-of-gauge freight transportation route decision -making (ROF-TRD) process in which safety distances between the railway gauges and freight loading outlines, the curve radius and the arrival-departure traffic flow balance are taken into consideration while the railway capacity losses and transportation costs being as objective functions to construct the route decision-making model considering gauge modification. The proposed route search algorithm can be used in the model to further refine the design of an effective safety distance bilateral detection. The case study verification shows that the safest and most economical railway out-of-gauge freight transportation route can be obtained by applying the proposed model, and the results demonstrate that taking railway capacity loss and modified costs of possible ROF routes into consideration, the optimal route can save around 10-22 % of total costs.(c) 2023 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/ 4.0/).
作者机构：
[Hu, Hanli; Yi, Dan] Changsha Univ Sci & Technol, Sch Econ & Management, Changsha 410114, Peoples R China.;[Cao, Y; Cao, Yu] Cent South Univ, Sch Business, Changsha 410083, Peoples R China.;[Li, Qingsong] Cent South Univ Forestry & Technol, Sch Transportat & Logist, Changsha 410004, Peoples R China.
通讯机构：
[Cao, Y ] C;Cent South Univ, Sch Business, Changsha 410083, Peoples R China.
关键词：
green products;brown products;agent selling;direct selling;pricing strategies
摘要：
In order to respond to and take advantage of consumers’ growing interest in green products, an increasing number of firms are expanding their market share by introducing green versions of their brown products. However, firms are faced with the challenge of how to distribute green products to avoid mutual encroachment with brown products. To solve this problem, this paper constructs a Stackelberg game model consisting of a manufacturer (leader) and a retailer (follower), in which the manufacturer provides brown and green products, and then develops two channel structures for green products to be sold through the manufacturer (direct selling) and the retailer (agent selling). The results show that the manufacturer’s choice of green product distribution channels is affected by the direct selling costs and the market share of green consumers and their product preferences. When the direct selling cost is zero or consumers are green, the manufacturer always chooses direct selling. However, with an increase in the direct selling costs, if green consumers have a large difference in their preference for green and brown products, the manufacturer chooses agent selling, and vice versa. In particular, the impact of the market share of green consumers on the profits of the manufacturer is different in the two channel structures. The higher the market share of green consumers under agent selling, the more beneficial it is for the manufacturer. However, under direct selling, the profits of the manufacturer show an “inverted U” trend with the increase in the market share of green consumers. In addition, under certain conditions, the direct selling channels opened by the manufacturer are not necessarily to sell green products, but to maximize the market share of brown products. The strategy is to set high prices for green products in direct selling channels to stimulate consumers to buy brown products. These findings can provide insights for manufacturers to design appropriate green product distribution strategies.
作者机构：
[Song, Rui; Shi, Wen; Song, R; Qin, Wanyi] Cent South Univ Forestry & Technol, Sch Logist & Transportat, Changsha, Peoples R China.;[Xue, Xingjian] Cent South Univ Forestry & Technol, Sch Landscape Architecture, Changsha, Peoples R China.
通讯机构：
[Song, R ] C;Cent South Univ Forestry & Technol, Sch Logist & Transportat, Changsha, Peoples R China.
摘要：
To achieve low-carbon and green mobility, the government needs to encourage people to buy and use new energy vehicles. This study proposes a tripartite evolutionary game model among new energy vehicle manufacturers, consumers, and government agencies. The game strategy combinations of each party and the stability conditions of the equilibrium point in the evolutionary game system are analyzed, and the validity of the conclusions is verified by simulation results. Compared with traditional studies that suggest the government should adopt the direct subsidy policy, this study shows that in the early stage of new energy vehicle development, government subsidies are still important for the rapid growth of new energy vehicle production and sales, but indirect policies can play a key role as the new energy vehicle industry matures. In addition to the price, the attractiveness of vehicle brands, the perceived utility of the products among consumers, and the coverage of charging infrastructure in cities also determine whether consumers decide to purchase and use new energy vehicles. The findings could provide useful recommendations for governments and manufacturers of new energy vehicles to meet their "dual carbon" targets.
关键词：
Energy absorption;Engineering application;Mechanical properties;Nomex honeycomb;Polyurethane foam
摘要：
To enhance the mechanical properties of Nomex honeycomb, the honeycomb was foamed in-situ using rigid polyurethane (PU) foam and flexible polyurethane foam (NHRPU, NHFPU, collectively NHPU). Mechanical properties were studied based on tests, theoretical and finite element (FE) methods, respectively. The results showed that NHRPU and NHFPU improve the energy absorption by 85.25% and 47.27% compared to the sum of PU and honeycomb alone. The specific energy absorption (SEA) of NHRPU is improved by 21.76%, while the SEA of NHFPU decreases, NHRPU significantly improves in terms of the honeycomb energy absorption performance, while NHFPU enhances the resilience of the honeycomb. The mesoscale FE model and equivalent FE model were constructed to achieve better prediction of NHPU. 75.6% energy absorption and 19.8% SEA can be improved by NHPU as a core-filled thin-walled tube compared with empty tube, and the passive safety protection capability is significantly improved by applying NHPU-filled structures in railway vehicles.
期刊：
International Journal of Production Research,2023年62(7) ISSN：0020-7543
通讯作者：
Li, SL
作者机构：
[Li, Shuanglin; Chen, Wanru; Li, SL; Zhang, Dezhi; Zhang, Yarui] Cent South Univ, Sch Traff & Transportat Engn, Changsha, Peoples R China.;[Li, Shuangyan] Cent South Univ Forestry & Technol, Sch Transportat & Logist, Changsha, Peoples R China.
通讯机构：
[Li, SL ] C;Cent South Univ, Sch Traff & Transportat Engn, Changsha, Peoples R China.
关键词：
Emergency logistics;secondary disasters;location-allocation problem;robust optimisation model;case study
摘要：
Developing an effective emergency collaborative distribution system is critical to improve on-time response performance, especially considering secondary disasters. To address the challenge, this paper investigates a bi-objective robust optimisation model on relief collaborative distribution among three echelons of authorities, the province, the municipality, and the county, which aims to minimise the total travel time and the total humanitarian logistics cost simultaneously. The optimal location of relief supply facilities and the relief distribution schemes will be determined by the optimisation model, which considers uncertain demand and travel time. Moreover, two robust optimisation methods are utilised to deduce the robust counterparts of the proposed model. An epsilon-constraint-based approach is used to solve the bi-objective optimisation model. A real-world case study based on an earthquake and aftershocks with different magnitudes in Yunnan Province is provided. The results show that incorporating secondary disaster scenarios contributes to reducing the total travel time and cost. For making full use of emergency resources and preventing situations from worsening, the centralised decision scheme is more effective than the decentralised one. The uncertainty of demand of primary disaster relief has a higher impact on the optimal solution than that of travel time.
摘要：
Traffic flow parameters are an important data support for the research and development of several technologies in the intelligent transportation system. Therefore, accurate and real-time estimation of traffic flow is particularly important for urban traffic. In this study, a real-time traffic flow detection system framework was constructed based on video image collection and analysis. According to the vehicle detection and tracking results, a traffic flow parameter estimation model and an improved LSTM network are proposed for spatiotemporal counting feature recognition. The results conclude that the developed framework can estimate the traffic flow density and count vehicles, as well as estimate the traffic flow velocity and traffic volume to estimate and optimize traffic flow, respectively. Additionally, the simulation results show that the proposed method can not only counts the two-way traffic vehicles quickly and accurately, but also avoids the use of the complex multi-target tracking method to spatiotemporal correlation of a single target, increases the speed and accuracy of the spatiotemporal information processing procedure, and has stronger scene adaptability.
期刊：
Expert Systems with Applications,2023年221:119752 ISSN：0957-4174
通讯作者：
Xu, Xuanhua(xuxh@csu.edu.cn)
作者机构：
[Zhao, Chengwei] Cent South Univ Forestry & Technol, Business Sch, Changsha 410004, Peoples R China.;[He, Jishan; Xu, Xuanhua] Cent South Univ, Sch Business, Changsha 410083, Hunan, Peoples R China.;[Liu, Ruihuan] Cent South Univ Forestry & Technol, Sch Logist & Transportat, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Xuanhua Xu; Ruihuan Liu] S;School of Business, Central South University, Changsha 410083, China<&wdkj&>School of Logistics and Transportation, Central South University of Forestry and Technology, Changsha 410004, China
关键词：
Attribute interaction;Choquet integral;Heterogeneous preferences;Multi-attribute group decision-making;Shapley-based dynamical variable weights
期刊：
Mechanics Based Design of Structures and Machines,2023年:20 ISSN：1539-7734
通讯作者：
Xie, SC
作者机构：
[Zhou, Hui] Cent South Univ Forestry & Technol, Sch Logist & Transportat, Changsha, Peoples R China.;[Zhang, Jing; Xie, SC; Xie, Suchao; Feng, Zhejun; Cao, Zixing] Cent South Univ, Key Lab Traff Safety Track, Minist Educ, Changsha, Peoples R China.;[Zhang, Jing; Xie, Suchao; Feng, Zhejun; Cao, Zixing] Cent South Univ, Sch Traff & Transportat Engn, Changsha, Peoples R China.
通讯机构：
[Xie, SC ] C;Cent South Univ, Key Lab Traff Safety Track, Minist Educ, Changsha, Peoples R China.
关键词：
Structural design;crashworthiness analysis;expanding-splitting;circular tubes;theoretical model
摘要：
The use of expanding-splitting circular tubes was proposed to improve crashworthiness and overcome their deficiencies in terms of low energy absorption and poor stroke efficiency in a single deformation mode. Quasi-static experiments and finite element simulations were conducted to study the force-displacement response of circular tubes under combined deformation modes. A theoretical model of the circular tube during expanding-splitting deformation was established to reveal the coupled expanding-splitting deformation and energy-absorbing mechanism of the circular tube. Furthermore, the factors influencing key parameters were analyzed using the finite element model. The results showed that the behavior changed smoothly from splitting deformation to curling deformation when adding preformed notches to the circular tube, and the final platform force of the circular tube decreased when increasing the transitional radius. Compared with the traditional expansive structure, the combined energy absorber offers better energy absorption with a 78% increase in platform force.
