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On the development and analysis of a comprehensive police patrolling model
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2025-01-01 DOI: 10.1016/j.ejtl.2025.100153
Fatemeh Mousapour, Rajan Batta, Jose L. Walteros
Police patrolling is a combination of proactive and reactive tasks. The initial focus is on the development and analysis of a deterministic model which has proactive patrolling tasks consisting of hot spot and general patrolling duties. Two different formulations are developed to address the problem: a compact arc-based and an extensive path-based formulation embedded in a column generation procedure. These formulations incorporate three metrics of efficiency and fairness: density, equity, and dispersion. Our model has discrete time steps and seeks to make a balance between hot spot and general patrolling duties by defining details of patrolling routes. The model allows a patrol unit to be at a hot spot for multiple consecutive time steps, thereby allowing foot patrolling to be used at a hot spot. We embed the deterministic model in a simulation environment for the purpose of defining proactive patrolling routes while responding to the calls for service. Numerical experiments are conducted to (a) evaluate the computational efficiency of the proposed methods, and (b) explore sensitivity analysis with respect to key parameters. A crime-data based case study is developed to illustrate the utility of the models and methods in a practical situation.
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引用次数: 0
The commodity constrained split delivery vehicle routing problem considering carbon emission: Formulations and a branch-and-cut method
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2025-01-01 DOI: 10.1016/j.ejtl.2025.100154
Kamyla Maria Ferreira , Claudia Archetti , Diego Delle Donne , Reinaldo Morabito , Pedro Munari
This paper introduces the Green Commodity constrained Split Delivery Vehicle Routing Problem (GC-SDVRP), which involves designing efficient and environmentally friendly delivery routes that reduce the CO2 emissions associated with transporting multiple commodities. In this problem, different commodities demanded by a customer can be delivered by one or more vehicles, if beneficial, which poses additional modeling and solution challenges. We propose a relaxed formulation that provides a lower bound on the optimal value of the GC-SDVRP, and adapt two other formulations from the literature to address this problem. Additionally, we develop a branch-and-cut (BC) method based on two of these formulations, and introduce a procedure for deriving feasible solutions to the GC-SDVRP from solutions obtained with the relaxed formulations. The results of computational experiments performed on benchmark instances indicate the superior performance of the BC method based on the proposed formulation. Furthermore, they show that, contrary to the traditional objective of minimizing distance, the GC-SDVRP is significantly easier to solve to optimality and can reduce CO2 emissions by 2.59% compared to the problem that minimizes total travel distance. Our investigation also reveals that increasing vehicle capacity improves solution quality in the GC-SDVRP, while split delivery can enable further reductions in CO2 emissions. Finally, although increasing the number of commodities imposes challenges in solving the problem, the possibility of split delivery mitigates its impact on the value of the final solution, indicating that an increase in the number of commodities does not necessarily result in higher CO2 emissions.
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引用次数: 0
Stop plan optimisation for three-pattern skip-stop schemes for urban rail transit systems
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2025-01-01 DOI: 10.1016/j.ejtl.2024.100149
Somporn Sahachaiseree , Mohammad Sadrani , Constantinos Antoniou
Mass rapid transit systems around the world are typically designed for all-stop operation schemes, in which train overtaking is not possible. To accelerate transit operation, the conventional A/B skip-stop scheme may be planned. This research explores alternative skip-stop schemes with three stop patterns, aiming to better match transit services with the spatial distribution of travel demand. The proposed generalised skip-stop operation model considers both the total cost of passengers and operator. A genetic algorithm is employed to solve the stop-plan optimisation problem, and a heuristic is tailored to determine an optimal dispatch headway for the respective stop plan. Based on computational experiments using synthetic data, the results suggest that skip-stop schemes have the potential to reduce total time costs by about 10%, particularly when there are structured demand concentrations, transit systems can operate safely with low time headway and short-distance demand is low. Although the total-cost saving of the best A/B skip-stop plan found is generally superior to those of other three-pattern skip-stop schemes, a three-pattern skip-stop scheme was found to offer a better total-cost saving in a scenario without short-distance travel demands. Overall, this research offers valuable insights into the potential benefits and limitations of different skip-stop schemes, contributing to a better understanding of their impact on passengers and operators.
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引用次数: 0
Accelerating the electric vehicle revolution: Policy implications of charging subsidies and green taxes
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2025-01-01 DOI: 10.1016/j.ejtl.2025.100152
Sanchari Guha Niyogi
Electric vehicles (EVs) are central to global efforts to reduce transportation emissions, yet limited charging infrastructure remains a primary barrier to widespread adoption. Governments worldwide have implemented various subsidies for EV purchasers and manufacturers, alongside green tax schemes, to incentivise infrastructure expansion and boost EV uptake. This research explores the efficacy of policy combinations — specifically purchase-based or per-station subsidies and green taxes — in a duopolistic market setting. By employing a game-theoretic model comprising profit-maximising EV and gasoline vehicle (GV) manufacturers, a population of utility-maximising consumers, and a social welfare-maximising government, we observe that a purchase-based subsidy in combination with a green tax provides a win–win–win outcome for the government and the manufacturers. Incorporating consumers’ EV-related anxieties, our analysis suggests that a green tax, either on its own or combined with subsidies, is the most effective policy for governments aiming to maximise social welfare. In markets characterised by diverse and sometimes misinformed consumers, a policy mix of green taxes and charging subsidies proves especially beneficial when the environmental impact of EV adoption is substantial. Additionally, when accounting for network effects, which could result in congested charging stations, pairing consumer subsidies with a green tax emerges as the preferential policy. Manufacturers and policymakers are provided with multifaceted insights that aid in conceptualising electric mobility.
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引用次数: 0
Fifty years on maritime transportation
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2025-01-01 DOI: 10.1016/j.ejtl.2024.100148
Marielle Christiansen , Kjetil Fagerholt , David Pisinger
This paper gives a detailed overview of the last 50 years of research in maritime transportation, with special focus on operations research techniques applied to the seaside operations. We describe the evolution in industrial, tramp and liner shipping, identify the driving trends, and discuss future challenges.
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引用次数: 0
50 years of OR in railway timetabling and rolling stock planning
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2025-01-01 DOI: 10.1016/j.ejtl.2025.100155
Pedro José Correia Duarte , Stéphane Dauzère-Pérès , Dennis Huisman , Carlo Mannino , Giorgio Sartor , Norman Weik , Philipp Widmann
This survey paper discusses the literature on Operations Research (OR) models and algorithms for railway planning in the last decades. Since infrastructure and rolling stock are two resources that are both very capital-intensive and characterize the railway system, we focus on timetabling and rolling stock planning problems. For timetabling, we also classify the literature among two dimensions, namely the decision level (strategic, tactical, operational) and the type of network infrastructure (dependent routes, independent routes). We also discuss robustness aspects in both planning problems.
We focus the discussion of the literature on the applicability of the models in the European context, where different types of trains (high-speed passenger trains, high-frequent suburban trains and freight trains) often share the same tracks and the organization of the railways is usually split between an infrastructure manager and one or more railway undertakings operating the trains.
We conclude the paper with some challenges and future research directions.
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引用次数: 0
A decomposition approach for integrated locomotive scheduling and driver assignment in rail freight transport 铁路货运中机车调度和司机分配一体化的分解方法
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2024-01-01 DOI: 10.1016/j.ejtl.2024.100145
Andreas Bärmann , Alexander Martin , Jonasz Staszek
In this work, we consider the integrated problem of locomotive scheduling and driver assignment in rail freight companies. Our aim is to compute an optimal simultaneous assignment of locomotives and drivers to the trains listed in a given order-book. Mathematically, this leads to the combination of a set-packing problem with compatibility constraints and a multi-commodity-flow problem. We develop a binary-programming formulation to model the given task and improve it by performing a clique-based tightening of the original set-packing inequalities. The objective function of this model makes sure that as many trains as possible are running. To handle the computational complexity of the problem, we introduce a novel decomposition approach which decomposes the problem into a master locomotive scheduling problem and a subproblem for driver assignment. It exploits the fact that the master problem is empirically much easier to solve than the subproblem. For any fixed solution of the master problem, we can use the subproblem to either confirm feasibility of the master solution or to derive valid inequalities from various constraint classes to cut the infeasible master solution off and reiterate. To further improve solution times, we also develop a presolve heuristic. We demonstrate the potential of the presented method by solving a large-scale real-world problem instance provided by our industry partner DB Cargo Polska S.A., as well as a set of derived realistic instances.
在这项工作中,我们考虑的是铁路货运公司机车调度和司机分配的综合问题。我们的目标是计算出机车和司机对给定订单所列列车的最优同步分配。在数学上,这导致了一个带有兼容性约束的集合包装问题和一个多商品流问题的结合。我们开发了一种二元编程模型来模拟给定任务,并通过对原始的集合包装不等式进行基于类群的紧缩来改进该模型。该模型的目标函数确保尽可能多的列车运行。为了解决该问题的计算复杂性,我们引入了一种新颖的分解方法,将该问题分解为主机车调度问题和司机分配子问题。它利用了主问题比子问题更容易解决这一事实。对于主问题的任何固定解,我们都可以利用子问题来确认主问题解的可行性,或者从各种约束类别中推导出有效的不等式,以切断不可行的主问题解,并重新进行求解。为了进一步缩短求解时间,我们还开发了一种预解启发式。我们通过解决我们的行业合作伙伴 DB Cargo Polska S.A. 提供的一个大型实际问题实例以及一组衍生的现实实例,展示了所介绍方法的潜力。
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引用次数: 0
The role of traffic simulation in shaping effective and sustainable innovative urban delivery interventions 交通模拟在形成有效和可持续的创新型城市交付干预措施中的作用
IF 2.4 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2024-01-01 DOI: 10.1016/j.ejtl.2024.100130
Yijie Su , Hadi Ghaderi , Hussein Dia

Cities around the globe face major last mile delivery (LMD) challenges as a result of surging online commerce activity, increased parcel delivery demands, lack of parking capacity, and severe traffic congestion particularly in inner city areas. Although a number of innovative solutions and pathways have been proposed to address these challenges, their full impacts are still not well understood due to the lack of comprehensive field studies and real-world data on their performance. Traffic simulation techniques, which are widely used to model and evaluate the impacts of a wide range of urban mobility interventions, offer opportunities to investigate the impacts of city logistics interventions. However, research evidence on this topic remains fragmented, hindering constructive analysis of the role of traffic simulation and modelling in shaping sustainable urban delivery interventions. Given the growing research interest in the nexus of traffic simulation and city logistics, this paper aims to identify and evaluate primary studies related to the simulation forms, evolution, effectiveness, and their feasibility in evaluating the impacts of urban delivery interventions. The paper achieves this through a holistic systematic review that consolidates diverse perspectives on the topic. The paper analysed 79 articles, published by December 2023, that have used traffic simulation to model and evaluate a wide range of city logistics interventions. The review identified five main themes in the literature surrounding development and applications of traffic simulation, namely their use in evaluating the role of information and communication technologies, evaluations of advances in types and forms of delivery vehicles, their application in supporting policy interventions, evaluations of innovations in city logistics facilities and impacts of the collaborative economy. The review also helped in gaining insights about urban delivery interventions and their impacts as stand-alone or in combination with other solutions. The analysis confirms the validity and versatility of traffic simulation as an approach to model the impacts of urban delivery interventions on traffic flow, delivery service and customers, but also the sustainability implications of interventions. The paper also provides a future research agenda to guide future studies in developing and evaluating applications of various interventions with the leverage of traffic simulation.

由于在线商务活动激增、包裹递送需求增加、停车场容量不足以及严重的交通拥堵(尤其是在城市内部地区),全球各地的城市都面临着最后一英里递送(LMD)的重大挑战。尽管已经提出了许多创新解决方案和途径来应对这些挑战,但由于缺乏全面的实地研究和有关其性能的实际数据,人们对它们的全面影响仍不甚了解。交通模拟技术被广泛用于模拟和评估各种城市交通干预措施的影响,为研究城市物流干预措施的影响提供了机会。然而,有关这一主题的研究证据仍然零散,阻碍了对交通模拟和建模在形成可持续城市配送干预措施中的作用进行建设性分析。鉴于对交通仿真与城市物流之间关系的研究兴趣与日俱增,本文旨在确定和评估与仿真形式、演变、有效性及其在评估城市配送干预措施影响方面的可行性相关的主要研究。本文通过全面系统的综述,整合了有关该主题的各种观点,从而实现了这一目标。论文分析了截至 2023 年 12 月发表的 79 篇文章,这些文章利用交通仿真对各种城市物流干预措施进行了建模和评估。综述确定了围绕交通仿真开发和应用的五大文献主题,即用于评估信息和通信技术的作用、评估配送车辆类型和形式的进步、应用于支持政策干预、评估城市物流设施的创新以及协作经济的影响。审查还有助于深入了解城市配送干预措施及其作为独立解决方案或与其他解决方案相结合所产生的影响。分析证实了交通模拟作为模拟城市配送干预措施对交通流量、配送服务和客户影响的一种方法的有效性和多功能性,以及干预措施的可持续性影响。本文还提出了未来的研究议程,以指导今后利用交通模拟开发和评估各种干预措施应用的研究。
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引用次数: 0
Bundles generation and pricing in crowdshipping 众包的生成和定价
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2024-01-01 DOI: 10.1016/j.ejtl.2024.100142
Giusy Macrina , Claudia Archetti , Francesca Guerriero

Crowdshipping is a new delivery paradigm that exploits the capacity of ordinary people who offer their own vehicles and free time to perform deliveries against compensation. In this work, we consider a peer-to-peer logistic platform where a company receives orders from its customers and assigns them to occasional drivers (ODs), or crowdshippers, who perform the delivery operations. We first investigate the problem of deciding how the orders should be partitioned into bundles, where a bundle is a set of orders assigned to the same OD. Then, we focus on the problem of determining the compensation associated with each bundle, with the purpose of minimizing the total delivery costs. The pricing scheme is based on the assumption that each OD is associated with a willingness-to-serve function, which is modeled as a random variable that gives the probability that the OD accepts to deliver the bundle given the compensation value. This random variable captures the estimation of the willingness-to-serve function that the company has elaborated, for example on the basis of historical data. If the compensation offered by the company is greater than or equal to the willingness-to-serve value, the OD performs the delivery, otherwise she/he refuses. In case no OD is available to deliver a bundle, then all packages in the bundle are offered to a third-party delivery company. We simulate two auction systems for the assignment of bundles to ODs: a static and a dynamic auction. In exhaustive simulation tests, we compare different pricing schemes as well as the two auction systems, and outline several managerial insights.

众包送货是一种新的送货模式,它利用普通人的能力,让他们提供自己的车辆和空闲时间,进行有偿送货。在这项工作中,我们考虑了一个点对点物流平台,在这个平台上,一家公司接收客户的订单,并将其分配给临时司机(OD)或众包送货员,由他们执行送货操作。我们首先研究的问题是决定如何将订单划分为捆绑订单,其中捆绑订单是指分配给同一 OD 的一组订单。然后,我们重点研究确定与每个捆绑相关的补偿问题,目的是最大限度地降低总配送成本。定价方案基于这样一个假设,即每个 OD 都与服务意愿函数相关联,该函数被建模为一个随机变量,给出了 OD 在给定补偿值的情况下接受交付捆绑订单的概率。该随机变量反映了公司对服务意愿函数的估计,例如根据历史数据进行的估计。如果公司提供的补偿大于或等于服务意愿值,则外包商执行交付,否则拒绝交付。如果没有 OD 可以递送捆绑包裹,那么捆绑包裹中的所有包裹都会提供给第三方递送公司。我们模拟了两种将包裹分配给 OD 的拍卖系统:静态拍卖和动态拍卖。在详尽的模拟测试中,我们对不同的定价方案以及两种拍卖系统进行了比较,并概述了一些管理见解。
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引用次数: 0
Optimizing Autonomous Transfer Hub Networks: Quantifying the potential impact of self-driving trucks 优化自动驾驶转运枢纽网络:量化自动驾驶卡车的潜在影响
IF 2.1 Q2 OPERATIONS RESEARCH & MANAGEMENT SCIENCE Pub Date : 2024-01-01 DOI: 10.1016/j.ejtl.2024.100141
Chungjae Lee , Kevin Dalmeijer , Pascal Van Hentenryck , Peibo Zhang

Autonomous trucks are expected to fundamentally transform the freight transportation industry. In particular, Autonomous Transfer Hub Networks (ATHNs), which combine autonomous trucks on middle miles with human-driven trucks on the first and last miles, are seen as the most likely deployment pathway for this technology. This paper presents a framework to optimize ATHN operations and evaluate the benefits of autonomous trucking. By exploiting the problem structure, this paper introduces a flow-based optimization model for this purpose that can be solved by blackbox solvers in a matter of hours. The resulting framework is easy to apply and enables the data-driven analysis of large-scale systems. The power of this approach is demonstrated on a system that spans all of the United States over a four-week horizon. The case study quantifies the potential impact of autonomous trucking and shows that ATHNs can have significant benefits over traditional transportation networks.

自动驾驶卡车有望从根本上改变货运业。尤其是自动驾驶转运枢纽网络(ATHN),它将中间里程的自动驾驶卡车与首末里程的人工驾驶卡车结合在一起,被视为该技术最有可能的部署途径。本文提出了一个优化 ATHN 运营和评估自主卡车运输效益的框架。通过利用问题结构,本文为此引入了一个基于流程的优化模型,黑盒求解器可在数小时内求解该模型。由此产生的框架易于应用,并能对大规模系统进行数据驱动分析。本文在一个为期四周、横跨全美的系统上展示了这种方法的威力。该案例研究量化了自动驾驶卡车运输的潜在影响,并表明自动驾驶运输网络与传统运输网络相比具有显著优势。
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引用次数: 0
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EURO Journal on Transportation and Logistics
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