QH

Q. Hu

info

Please Note

6 records found

Review (2019) - Qu Hu, Bart Wiegmans, Francesco Corman, Gabriel Lodewijks
Nowadays, the major ports around the world usually consist of multiple terminals and service centers which are often run by different operators. Meanwhile, inland terminals have been also developed to reduce port congestion and improve transport efficiency. The integrated planning of inter-terminal transport (ITT) between the seaport and inland terminals helps in providing frequent and profitable services, but also could lead to higher overall planning complexity. Moreover, the ITT system usually involves multiple stakeholders with different or even conflicting interests. Although an increasing number of studies have been conducted in recent years, few studies have summarized the research findings and indicated the directions for future research regarding ITT. This paper provides a systemic review of ITT planning: we examine 77 scientific journal papers to identify what kind of objectives should be achieved in ITT system planning, which actors should be involved, and what methodologies can be used to support the decision-making process. Based on the analysis of the existing research, several research gaps can be found. For example, the multi-modality ITT systems are rarely studied; cooperation frameworks are needed in the coordination of different actors and quantitative methodologies should be developed to reflect the different actors’ financial interests. ...
Journal article (2019) - Qu Hu, Bart Wiegmans, Francesco Corman, Gabriel Lodewijks
This paper investigates the problem of inter-terminal movements of containers and vehicles within a port area in order to achieve an integrated and effective transport within the port and towards the hinterland. Containers from different port terminals are first moved to a rail yard and then delivered to the hinterland by rail. To provide insights for stakeholders such as port authority and terminal operators into tactical planning problems, e.g., the coordination between terminals, railway timetable and train sizes, this paper proposes an optimization model describing the movement of containers and various vehicles between and inside terminals. The model aims at improving the container delivery from container terminals to the hinterland considering both railway hinterland transport and terminal handling operations. A network inspired by a real-life port area and its hinterland is used as a test case to test different components, i.e., inter-terminal transport connections, train formation, railway timetable. A rolling horizon framework is used to improve the computation efficiency in large transport demand cases. The result of the optimization helps in identifying the most promising features, namely, that more connections between terminals and a flexible outbound railway timetable could contribute to improving the integrated container transport performance. ...
Doctoral thesis (2019) - Qu Hu
This thesis discusses the connection between container terminals and the hinterland railway system. Mathematical models are proposed to formulate the various relevant operations and methods are developed to provide solutions to improve the system performance. This thesis could provide suggestions to decision maker(s) regarding to the improvement in both inter-terminal transport system and the hinterland railway system, i.e., increasing the number of containers delivered on time with lower costs. ...
Journal article (2018) - Qu Hu, Francesco Corman, Bart Wiegmans, Gabriel Lodewijks
Transport demand for containers has been increasing for decades, which places pressure on road transport. As a result, rail transport is stimulated to provide better intermodal freight transport services. This paper investigates mathematical models for the planning of container movements in a port area, integrating the inter-terminal transport of containers (ITT, within the port area) with the rail freight formation and transport process (towards the hinterland). An integer linear programming model is used to formulate the container transport across operations at container terminals, the network interconnecting them, railway yards and the railway networks towards the hinterland. A tabu search algorithm is proposed to solve the problem. The practical applicability of the algorithm is tested in a realistic infrastructure case and different demand scenarios. Our results show the degree by which internal (ITT) and external (hinterland) transport processes interact, and the potential for improvement of overall operations when the integrated optimization proposed is used. Instead, if the planning of containers in the ITT system is optimized as a stand-alone problem, the railway terminals may suffer from longer delay times or additional train cancellations. When planning the transport of 4060 TEU containers within one day, the benefits of the ITT planning without considering railway operations account for 17% ITT cost reduction but 93% railway operational cost growth, while the benefits of integrating ITT and railway account for a reduction of 20% in ITT cost and 44% in railway operational costs. ...
Conference paper (2016) - Qu Hu, Xiaojie Luan, Francesco Corman, Gabri Lodewijks
This paper discusses the container transport problem between terminals. The inter-terminal transport (ITT) becomes increasingly important with the expansion of port area and the intermodal transport. A major challenge to optimize the container transport is to find the adequate algorithm to handle the large-scale transport demand and planning horizon. A time-space graph is used to formulate the ITT in this paper, and then a tabu search algorithm is proposed. In order to test the algorithm, we apply it to a transport network with 18 terminals at the Maasvlakte in Port of Rotterdam. Different tabu search components are tested with different demand scenarios. A comparison of the results obtained by CPLEX and by the tabu search algorithm is also addressed. Through the comparison we can find that the algorithm can find good solution quickly, and performs well even for large scale transport demands where exact approaches are unable to find good solutions. ...