S. Fazi
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14 records found
1
The continuous growth of international container trade calls for logistics networks that seamlessly connect cross-border, domestic, and local transport services. In the design of these networks with various hubs and modes of transport, the consideration of both economies of scale for multimodal transport and congestion is essential since they can significantly impact the location of the hubs and their size. Thereby, in this paper, we study these features within a multimodal hub location problem for international trade that considers a hierarchy in the network structure. We develop a mixed-integer linear programming formulation, minimizing infrastructural, operational, and congestion costs. A hybrid adaptive variable neighborhood search algorithm with tailored operators and speed-up strategies is proposed to solve large-scale instances. Numerical experiments are conducted for China's New Western Land-Sea Corridor case and provide new managerial insights for designing hierarchical, multi-modal, cross-border logistics networks.
Freight Mobility as a Service
Open platforms for synchromodal transport
We propose user-centric booking platforms for end-to-end freight transport as a requirement for the scaling of synchromodal transport and a new avenue for transport and logistics research. We start with the assertion that synchromodal transport is still an unapplied concept due to the strong heterogeneity and disconnection of the transport offer and the huge variety of cargo requests. We suggest that open digital platforms with a focus on shippers can help create transparency that benefits shippers and carriers, and may increase the efficiency in the use of network capacity. We denote the concept Freight Mobility as a Service (FMaaS). Current digital platforms predominantly operate under the assumption that transport services are on-demand, often with flexible lead times, overlooking the structured nature of most actual transport operations. FMaaS challenges this paradigm by recognizing that a significant portion of transport – such as rail, barge, and short sea shipping – is inherently scheduled, not chartered, and must be integrated accordingly. Finally, FMaaS is an open market where the visibility of the transport service offer for the shipper is global and not limited to contracts between the platform operator and the service suppliers. The applicability of FMaaS presents barriers and questions that open possibilities for a rich multidisciplinary research agenda. One of the main barriers to this concept is the acceptance of the actors involved, along with the lack of scientific evidence on how a user-centric platform system can help achieve the sustainability challenge. Also, the development of centralized platforms may pose serious commercial and legal threats. This paper aims to describe the requirements and possible research avenues of this new paradigm in the wake of an emerging market.
The demand for new offshore wind farms is increasing at a rapid pace, and the installation rate must be quadrupled by 2030 to meet the ambitions of European countries. The installation of the superstructures involves several components and is highly weather-dependent, making this an important bottleneck. In this paper, we evaluate the two main strategies for the installation of superstructures: feedering and shuttling. With feedering, the installation vessel is fed with components by feeder vessels directly from manufacturing ports. With shuttling, the installation vessel retrieves the components itself from a marshalling port. In contrast to existing studies, we include manufacturing ports and their production rate to have a better understanding of their influence on the installation rate and develop a rolling horizon optimization-simulation framework composed of a mixed integer linear programming model and a Markov simulation model for weather forecasting. A heuristic is proposed to solve the model to overcome the limitation of commercial solvers. Results indicate that accurate initial buffer calculations, depending on the production rate at the manufacturing ports and project-dependent characteristics, can increase the installation rate significantly for both strategies. Finally, feedering outperforms shuttling in most scenarios and is less weather dependent.
The ground handler dock capacitated pickup and delivery problem with time windows
A collaborative framework for air cargo operations
In this paper, we will study a typical problem in inland container shipping, concerning the barge transportation of maritime containers between a dry port and a set of seaport terminals. The barges depart from the dry port and visit a set of sea terminals, where containers need either to be dropped off or picked up. The goal is to achieve economies of scale with barges and avoid trucking as much as possible. The decision thus involves finding the best allocation of containers to barges in order to guarantee on-time delivery and meet capacity restrictions. The problem will be modeled as a variant of the split vehicle routing problem with simultaneous pickups and deliveries coupled with time features. The model includes parameters that can be tuned to improve barge utilization and travelling distance. A hybrid local search meta-heuristic algorithm, combined with a branch-and-cut solver, will be developed to solve the model. Numerical experiments have been conducted to test the performance of the algorithm and provide solution analysis for practical insights. Real-world data has been collected from a local barge operator based in the Port of Rotterdam region and will be used as input for the experiments. This will result in an in-depth analysis into current planning practices. The proposed framework complements existing models in the literature and contributes to the development of a comprehensive set of decision support tools, which help in the decision-making process for inland terminals.
Evaluating resource sharing for offshore wind farm maintenance
The case of jack-up vessels