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Developing a metro-based underground logistics system (M-ULS) to integrate freight activities into passenger rail transit networks is a sustainable option to improve urban traffic and mobility. This paper proposes innovative concepts for M-ULS prototypes. The system design uses knowledge from engineering practice, emerging initiatives, literature, and experts’ viewpoints. First, demand flows, hierarchies, and facility features of an M-ULS network are described, based on which the collaborative mechanism of shared metro passenger-goods transport, along with specialised packing and transportation strategies, are modelled and compared. Both overground and underground measures are envisaged for last-mile deliveries from metro to customers. Second, a hierarchical framework incorporating 37 key technologies that are necessary for M-ULS development is organised and evaluated. Third, interior layout schemes of a specific interchange metro station with logistics functions are designed. Underground space partitions at the platform layer and the station hall layer are visualised. The logistics workflows of the station are described in full. Evidence from literature and surveys indicates that the proposed M-ULS models are technically feasible, and their advantages and disadvantages are clear. This study contributes to providing a holistic decision support tool for the future planning and design of M-ULS and other rail-based freight transportation systems.
Wanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Zhilong Chen. A preliminary prototyping approach for emerging metro-based underground logistics systems: operation mechanism and facility layout. International Journal of Production Research 2020, 1 -21.
AMA StyleWanjie Hu, Jianjun Dong, Bon-Gang Hwang, Rui Ren, Zhilong Chen. A preliminary prototyping approach for emerging metro-based underground logistics systems: operation mechanism and facility layout. International Journal of Production Research. 2020; ():1-21.
Chicago/Turabian StyleWanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Zhilong Chen. 2020. "A preliminary prototyping approach for emerging metro-based underground logistics systems: operation mechanism and facility layout." International Journal of Production Research , no. : 1-21.
PurposeUnderground logistics system (ULS) is recognized as sustainable alleviator to road-dominated urban logistics infrastructure with various social and environmental benefits. The purpose of this study is to propose effective modeling and optimization method for planning a hub-and-spoke ULS network in urban region.Design/methodology/approachUnderground freight tunnels and the last-mile ground delivery were organized as a hierarchical network. A mixed-integer programming model (MIP) with minimum system cost was developed. Then a two-phase optimization schema combining Genetic-based fuzzy C-means algorithm (GA-FCM), Depth-first-search FCM (DFS-FCM) algorithm and Dijkstra algorithm (DA), etc. was designed to optimize the location-allocation of ULS facilities and customer clusters. Finally, a real-world simulation was conducted for validation.FindingsThe multistage strategy and hybrid algorithms could efficiently yield hub-and-spoke network configurations at the lowest objective cost. GA-FCM performed better than K-means in customer-node clustering. The combination of DFS-FCM and DA achieved superior network configuration than that of combining K-means and minimum spanning tree technique. The results also provided some management insights: (1) greater scale economies effect in underground freight movement could reduce system budget, (2) changes in transportation cost would not have obvious impact on ULS network layout and (3) over 90% of transportation process in ULS network took place underground, giving remarkable alleviation to road freight traffic.Research limitations/implicationsDemand pairs among customers were not considered due to lacking data. Heterogeneity of facilities capacity parameters was omitted.Originality/valueThis study has used an innovative hybrid optimization technique to address the two-phase network planning of urban ULS. The novel design and solution approaches offer insights for urban ULS development and management.
Wanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Zhilong Chen. Network planning of urban underground logistics system with hub-and-spoke layout: two phase cluster-based approach. Engineering, Construction and Architectural Management 2020, 27, 2079 -2105.
AMA StyleWanjie Hu, Jianjun Dong, Bon-Gang Hwang, Rui Ren, Zhilong Chen. Network planning of urban underground logistics system with hub-and-spoke layout: two phase cluster-based approach. Engineering, Construction and Architectural Management. 2020; 27 (8):2079-2105.
Chicago/Turabian StyleWanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Zhilong Chen. 2020. "Network planning of urban underground logistics system with hub-and-spoke layout: two phase cluster-based approach." Engineering, Construction and Architectural Management 27, no. 8: 2079-2105.
Motivated by urban land scarcity and surging demand, the underground space has become a frontier domain for future city logistics industry. The Underground Logistics System (ULS) is a sustainable option to overcome traffic congestion while improving freight transport efficiency. This study presents a comprehensive layout design and facility planning method for the two-echelon urban ULS network with hub-and-spoke structure. The underground network is organized by the primary and secondary ULS nodes and tunnels which have strong alignment with existing logistics nodes such as distribution centers and major demand terminals. A bi-objective mixed-integer linear programming model considering minimal costs and maximal system utilization was established to formulate the location-allocation of ULS nodes, tunnel layout and flow routing in the network. Given the inherent problem complexity, a series of simplification techniques and hybrid optimization procedures integrating both exact and meta-heuristic algorithms were developed to obtain high quality solutions. Finally, a real-world simulation was carried out in Beijing, China to demonstrate the applicability of proposed method. Results show that our procedures can effectively obtain the best configurations of ULS network under various scenarios and has better convergence efficiency and optimality performance. Moreover, a group of horizontal tests and sensitivity analysis reveals further insights regarding ULS network decision-making and layout strategies.
Wanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Zhilong Chen. Hybrid optimization procedures applying for two-echelon urban underground logistics network planning: A case study of Beijing. Computers & Industrial Engineering 2020, 144, 106452 .
AMA StyleWanjie Hu, Jianjun Dong, Bon-Gang Hwang, Rui Ren, Zhilong Chen. Hybrid optimization procedures applying for two-echelon urban underground logistics network planning: A case study of Beijing. Computers & Industrial Engineering. 2020; 144 ():106452.
Chicago/Turabian StyleWanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Zhilong Chen. 2020. "Hybrid optimization procedures applying for two-echelon urban underground logistics network planning: A case study of Beijing." Computers & Industrial Engineering 144, no. : 106452.
Ever-growing globalization and industrialization put forward impending requirements for green and sustainable logistics (G&SL). Over the past decades, G&SL initiatives triggered worldwide deliberations, aiming at easing negative transport externalities and improving supply chain performance. This review-based paper attempts to offer a joint quantitative and qualitative understanding for the overall evolutionary trend, knowledge structure, and literature gaps of the G&SL research field. Employing the science mapping approach, a total of 306 major paper published from 1999 to 2019 were retrieved, elaborated on, and synthesized. Visualized statistics regarding publication years, journal allocation/co-citation, inter-country/institution collaboration, influential articles, co-occurred keywords, and time view clusters of research themes were analyzed bibliographically. On this basis, a total of 50 sub-branches of G&SL knowledge were classified and thematically discussed based on five alignments, namely (i) social-environmental-economic research, (ii) planning, policy and management, (iii) application and practice, (iv) technology, and (v) operations research. Finally, the current knowledge obstacles and the future research opportunities were suggested. The findings contribute to portray a systematic intellectual prospect for the state quo, hotspots, and academic frontiers of G&SL research. Moreover, it provides researchers and practitioners with heuristic thoughts to govern transportation ecology and logistics service quality.
Rui Ren; Wanjie Hu; Jianjun Dong; Bo Sun; Yicun Chen; Zhilong Chen. A Systematic Literature Review of Green and Sustainable Logistics: Bibliometric Analysis, Research Trend and Knowledge Taxonomy. International Journal of Environmental Research and Public Health 2019, 17, 261 .
AMA StyleRui Ren, Wanjie Hu, Jianjun Dong, Bo Sun, Yicun Chen, Zhilong Chen. A Systematic Literature Review of Green and Sustainable Logistics: Bibliometric Analysis, Research Trend and Knowledge Taxonomy. International Journal of Environmental Research and Public Health. 2019; 17 (1):261.
Chicago/Turabian StyleRui Ren; Wanjie Hu; Jianjun Dong; Bo Sun; Yicun Chen; Zhilong Chen. 2019. "A Systematic Literature Review of Green and Sustainable Logistics: Bibliometric Analysis, Research Trend and Knowledge Taxonomy." International Journal of Environmental Research and Public Health 17, no. 1: 261.
Integrating logistics activities into urban passenger rail transit network (URFT) is regarded as an effective approach to promote urban sustainability and reduce the negative externalities of road-based transportation. This study applied a system dynamics method to simulate URFT system development by focusing on internal operations and external impacts. The characteristics of four major stakeholders (i.e., the government, URFT operator, market, and road freight sector) as well as a series of variables affecting system operations, such as metrics of social and environmental externalities, pricing, investment, and subsidies, were incorporated into two submodels. A case study of Beijing, China was provided to demonstrate the historical validity and rationality of simulation results from 2007 to 2035. Three decision variables (i.e., investment policy, network scale and market competitiveness) were combined into eight distinct scenarios to examine the external benefits, pricing strategies, capital funding structure and business volume of URFT. The findings show that URFT schemes with higher funding and capacity lead to greater reductions in the losses of traffic congestion, air pollution, and accidents. Furthermore, both government support in the early stage and regulation mechanisms among price, supply–demand level, and investment play significant roles in improving the system performance.
Wanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Yicun Chen; Zhilong Chen. Using system dynamics to analyze the development of urban freight transportation system based on rail transit: A case study of Beijing. Sustainable Cities and Society 2019, 53, 101923 .
AMA StyleWanjie Hu, Jianjun Dong, Bon-Gang Hwang, Rui Ren, Yicun Chen, Zhilong Chen. Using system dynamics to analyze the development of urban freight transportation system based on rail transit: A case study of Beijing. Sustainable Cities and Society. 2019; 53 ():101923.
Chicago/Turabian StyleWanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Yicun Chen; Zhilong Chen. 2019. "Using system dynamics to analyze the development of urban freight transportation system based on rail transit: A case study of Beijing." Sustainable Cities and Society 53, no. : 101923.
The contradiction between the contribution of city logistics (CL) to sustainable urban development and its negative externalities is increasingly prominent. Policy supervision measures and the green logistics initiative are also in conflict with the management goal of logistics enterprises. Innovative solutions for CL have attracted increasing research attention worldwide. However, the description of the global research network in the field of CL, research trends, and the discussion of advanced theories and practices have not been systematically reviewed so far. Especially in the past three years, there has been an explosive growth of relevant literature. In this paper, the method of combining scientometric analysis and thematic discussion was adopted to systematically review 513 important works in the literature from 1993 to 2018, aiming to provide a holistic understanding of the status in quo, trends and gaps of CL research, and to further analyze prominent problems. The study has made statistical analyses of the publication year profile, journal allocation and research methods of the included literature, and constructed four kinds of visualized bibliographic information timeline maps for the authorship network, international collaboration network, keywords co-occurrence network and research topic clustering. Then, the three themes summarized by clustering are discussed, mainly focusing on CL strategies and policy, green supply chain management, planning methods, and advanced concepts and practices. Finally, the research gaps framework and agenda were reported. This study contributes to summarizing the research and development of city logistics on the whole, and can also serve as an explorative manual to support sustainable urban freight activities and innovative research.
Wanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Zhilong Chen. A Scientometrics Review on City Logistics Literature: Research Trends, Advanced Theory and Practice. Sustainability 2019, 11, 2724 .
AMA StyleWanjie Hu, Jianjun Dong, Bon-Gang Hwang, Rui Ren, Zhilong Chen. A Scientometrics Review on City Logistics Literature: Research Trends, Advanced Theory and Practice. Sustainability. 2019; 11 (10):2724.
Chicago/Turabian StyleWanjie Hu; Jianjun Dong; Bon-Gang Hwang; Rui Ren; Zhilong Chen. 2019. "A Scientometrics Review on City Logistics Literature: Research Trends, Advanced Theory and Practice." Sustainability 11, no. 10: 2724.
Underground logistics system (ULS) tends to alleviate traffic congestion, increase city logistics efficiency, mitigate the negative effects of traditional logistics processes, and improve the sustainability of urban areas. However, the relatively high cost and risk of underground construction are serious obstacles to implementing ULS. Integrating ULS into modern metro system (M-ULS) is considered to be feasible and efficient to solve this problem. This paper aims at developing a metro system-based ULS network planning method. First, an evaluation model of underground freight volume was proposed considering service capacity, freight flow, and regional accessibility. Second, a set of mixed integer programming model was developed to solve the problem of optimal nodes’ location-allocation (LAP) in the network. Then, a hybrid algorithm was designed with a combination of E-TOPSIS, exact algorithm, and heuristic algorithm. Finally, two lines of Nanjing Metro were selected as a case to validate the proposed planning method. The results showed that the new system can significantly reduce the construction costs of ULS and alleviate traffic congestion. Moreover, the potential of metro stations and underground tunnels can be fully exploited to achieve higher logistics benefits.
Jianjun Dong; Wanjie Hu; Shen Yan; Rui Ren; Xiaojing Zhao. Network Planning Method for Capacitated Metro-Based Underground Logistics System. Advances in Civil Engineering 2018, 2018, 1 -14.
AMA StyleJianjun Dong, Wanjie Hu, Shen Yan, Rui Ren, Xiaojing Zhao. Network Planning Method for Capacitated Metro-Based Underground Logistics System. Advances in Civil Engineering. 2018; 2018 ():1-14.
Chicago/Turabian StyleJianjun Dong; Wanjie Hu; Shen Yan; Rui Ren; Xiaojing Zhao. 2018. "Network Planning Method for Capacitated Metro-Based Underground Logistics System." Advances in Civil Engineering 2018, no. : 1-14.