Download or read book Online Vehicle Routing written by Luis M. Torres and published by Cuvillier Verlag. This book was released on 2004 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Vehicle Routing Problem Latest Advances and New Challenges written by Bruce L. Golden and published by Springer. This book was released on 2008-06-26 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a unified and carefully developed presentation, this book systematically examines recent developments in VRP. The book focuses on a portfolio of significant technical advances that have evolved over the past few years for modeling and solving vehicle routing problems and VRP variations. Reflecting the most recent scholarship, this book is written by one of the top research scholars in Vehicle Routing and is one of the most important books in VRP to be published in recent times.

Download or read book The Vehicle Routing Problem written by Paolo Toth and published by . This book was released on 2002 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vehicle Routing written by Paolo Toth and published by SIAM. This book was released on 2014-12-05 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vehicle routing problems, among the most studied in combinatorial optimization, arise in many practical contexts (freight distribution and collection, transportation, garbage collection, newspaper delivery, etc.). Operations researchers have made significant developments in the algorithms for their solution, and Vehicle Routing: Problems, Methods, and Applications, Second Edition reflects these advances. The text of the new edition is either completely new or significantly revised and provides extensive and complete state-of-the-art coverage of vehicle routing by those who have done most of the innovative research in the area; it emphasizes methodology related to specific classes of vehicle routing problems and, since vehicle routing is used as a benchmark for all new solution techniques, contains a complete overview of current solutions to combinatorial optimization problems. It also includes several chapters on important and emerging applications, such as disaster relief and green vehicle routing.

Download or read book Online Vehicle Routing Problems and Analysis written by Ibrahim Capar and published by . This book was released on 2016 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditional optimization models, whether classified as deterministic or stochastic, require problem related parameters to be known with certainty or according to a probability distribution. However, in many real life problems, it is unrealistic to assume that problem parameters are known a priori. A problem is called online when all of the problem data is not immediately available and revealed incrementally. Hence, online optimization models help make decisions in the best possible way before all of the problem data is observed. This dissertation considers online vehicle routing problems in manufacturing and public safety domains. In the manufacturing domain, we consider outbound logistics problems of a company that serves a geographically dispersed customer base with a variety of products. At the end of each day, the company decides which orders to dispatch the next day via one of the three transportation modes, and which ones to delay into the future for better order consolidation and cost reduction opportunities. We solve this problem with two different methods. We propose two different solutions: i) a cluster-first, route-second type of heuristic; ii) a reduction heuristic based on a problem-specific lower bound. In the public safety domain, we investigate the online patrol routing problem given incrementally revealed accidents/incidents. In the traditional patrol routing problem, state troopers would follow the initial assigned routes without consideration for disruptive incidents, e.g., accidents. However, in real life, state troopers may have to be diverted to other tasks from their initial routing assignments such as responding to an accident. We use a simulation based analysis to compare the key performance indicators of the problem with other examples.

Download or read book The Vehicle Routing Problem Latest Advances and New Challenges written by Bruce L. Golden and published by Springer Science & Business Media. This book was released on 2008-07-20 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a unified and carefully developed presentation, this book systematically examines recent developments in VRP. The book focuses on a portfolio of significant technical advances that have evolved over the past few years for modeling and solving vehicle routing problems and VRP variations. Reflecting the most recent scholarship, this book is written by one of the top research scholars in Vehicle Routing and is one of the most important books in VRP to be published in recent times.

Download or read book Approximate Dynamic Programming for Dynamic Vehicle Routing written by Marlin Wolf Ulmer and published by Springer. This book was released on 2017-04-19 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a straightforward overview for every researcher interested in stochastic dynamic vehicle routing problems (SDVRPs). The book is written for both the applied researcher looking for suitable solution approaches for particular problems as well as for the theoretical researcher looking for effective and efficient methods of stochastic dynamic optimization and approximate dynamic programming (ADP). To this end, the book contains two parts. In the first part, the general methodology required for modeling and approaching SDVRPs is presented. It presents adapted and new, general anticipatory methods of ADP tailored to the needs of dynamic vehicle routing. Since stochastic dynamic optimization is often complex and may not always be intuitive on first glance, the author accompanies the ADP-methodology with illustrative examples from the field of SDVRPs. The second part of this book then depicts the application of the theory to a specific SDVRP. The process starts from the real-world application. The author describes a SDVRP with stochastic customer requests often addressed in the literature, and then shows in detail how this problem can be modeled as a Markov decision process and presents several anticipatory solution approaches based on ADP. In an extensive computational study, he shows the advantages of the presented approaches compared to conventional heuristics. To allow deep insights in the functionality of ADP, he presents a comprehensive analysis of the ADP approaches.

Download or read book Pro active Dynamic Vehicle Routing written by Francesco Ferrucci and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with transportation processes denoted as the Real-time Distribution of Perishable Goods (RDOPG). The book presents three contributions that are made to the field of transportation. First, a model considering the minimization of customer inconvenience is formulated. Second, a pro-active real-time control approach is proposed. Stochastic knowledge is generated from past request information by a new forecasting approach and is used in the pro-active approach to guide vehicles to request-likely areas before real requests arrive there. Various computational results are presented to show that in many cases the pro-active approach is able to achieve significantly improved results. Moreover, a measure for determining the structural quality of request data sets is also proposed. The third contribution of this book is a method that is presented for considering driver inconvenience aspects which arise from vehicle en-route diversion activities. Specifically, this method makes it possible to restrict the number of performed vehicle en-route diversion activities.​

Download or read book Impact of online tracking on a vehicle routing problem with dynamic travel times written by Jean Respen and published by . This book was released on 2014 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quantitative Approaches to Distribution Logistics and Supply Chain Management written by Andreas Klose and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing customer needs, the globalization of markets and the evolution of e-commerce add to the complexity of logistic processes. In today's business, it is well understood that an effective management of logistic processes is impossible without the use of computer-based tools and quantitative methods. This book presents in a systematic way quantitative approaches to distribution logistics and supply chain management. The main orientation of the book is towards practical problem solving, and numerous case studies and practical applications are presented. The topics covered include: supply chain management, revers logistics, e-commerce, facility location and network planning, vehicle routing, warehousing, inventory control.

Download or read book Real Time Vehicle Routing in Large Networks written by Laia Pagès Giralt and published by VDM Publishing. This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problems treated in this book are very simple in nature: how to route n vehicles in real time in a fast varying environment to pickup and deliver m passengers when both n and m are large? These problems are very relevant to future transportation options involving large scale real-time routing of shared-ride fleet transit vehicles. But, even if the nature of these problems looks so simple, solving them is not so straight forward, specially finding fast and reliable solutions. Traditionally, dynamic routing solutions were found as static approximations for smaller-scale problems or using local heuristics for the larger-scale ones. Generally heuristics used for these types of problems do not consider global optimality. This work develops a hierarchical methodology to solve these types of problems in three stages seeking global optimality. The book first introduces the problems treated, secondly presents the main characteristics of the proposed methodology, followed by insights on each of the proposed stages. Then a general framework to use the proposed methodology for any vehicle routing problem is presented. Finally, a real application is presented. The work is addressed to professionals and researchers working on vehicle routing and network optimization issues.

Download or read book Conflict free Vehicle Routing with an Application to Personal Rapid Transit written by Kaspar Schüpbach and published by Cuvillier Verlag. This book was released on 2012-09-04 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the conflict-free routing of vehicles through a track network, a problem frequently encountered in many applications in transportation and logistics. The most common routing approach for conflictfree routing problems in various settings is a sequential one, where requests are greedily served one after the other in a quickest way without interfering with previously routed vehicles. There is a need for a better theoretical understanding as guarantees on the quality of the routings are often missing. Conflict-free vehicle routing also is of inherent interest as a sister problem of the well-studied packet routing problem. In the first part, we present new theoretical results for the case of bidirectional networks. We consider a natural basic model for conflict-free routing of a set of k vehicles. Previously, no efficient algorithm is known with a sublinear (in k) approximation guarantee and without restrictions on the graph topology. We show that the conflict-free vehicle routing problem is hard to solve to optimality even on paths. Building on a sequential routing scheme, we present an algorithm for trees with makespan bounded by O(OPT) + k. Combining this result with ideas known from packet routing, we obtain a first efficient algorithm with sublinear approximation guarantee, namely an O(√k)-approximation. Additionally, a randomized algorithm leading to a makespan of O(polylog(k)) • OPT + k is presented that relies on tree embedding techniques applied to a compacted version of the graph to obtain an approximation guarantee independent of the graph size. The second part is about routing in the Personal Rapid Transit (PRT) application. PRT is a public transportation mode in which small automated vehicles transport passengers on demand. Central control of the vehicles leads to interesting possibilities for optimized routings. Routing in PRT is an online problem where transit requests appear over time and where routing decisions need to be taken without knowledge of future requests. Further, the network in PRT is directed. The complexity of the routing problems together with the fact that routing algorithms for PRT essentially have to run in real-time often leads to the choice of a fast sequential scheme. The simplicity of such schemes stems from the property that a chosen route is never changed later. This is as well the main drawback of it, potentially leading to large detours. It is natural to ask how much one could gain by using a more adaptive routing strategy. This question is one of the core motivations of this second part. We first suggest a variation to the routing model used in the first part which is suitable for PRT. We show that the routing problem remains hard in the directed setting. Further, we introduce a capacity notion for PRT networks and derive a bound for it. Computational results show that the capacity bound is close to the achievable throughput. It therefore is a useful quantity for estimating network capacity in PRT system design. We then introduce a new adaptive routing algorithm that repeatedly uses solutions to an LP as a guide to route vehicles. New requests are integrated into the LP as soon as they appear and the routing is reoptimized over all vehicles concurrently. We provide computational results that give evidence of the potential gains of an adaptive routing strategy. For this we compare the presented adaptive strategy to sequential routing and to a simple distributed routing strategy in a number of scenarios. Diese Dissertationsarbeit untersucht das konfliktfreie Befördern von Fahrzeugen durch Schienennetzwerke - eine Herausforderung, wie sie oft in verschiedensten Anwendungen in den Transport- und Logistikbranchen vorkommt. Der bekannteste Ansatz für die konfliktfreie Fahrplanung ist ein sequentieller, in dem eine Anfrage nach der anderen mit einer möglichst kurzen Reisezeit eingeplant wird, ohne mit den früheren Anfragen in Konflikt zu geraten. Solche Ansätze haben oft keine Qualitätsgarantien für den resultierenden Fahrplan, und es besteht ein Bedarf für ein besseres theoretisches Verständnis. Das Problem der konfliktfreien Fahrzeugbeförderung ist auch von Interesse durch die enge Verwandtschaft mit dem besser bekannten und untersuchten Problem der Datenbeförderung durch Kommunikationskanäle. Im ersten Teil der Dissertation präsentieren wir neue theoretische Resultate für den Fall von ungerichteten (in beiden Richtungen befahrbaren) Schienennetzwerken. Wir betrachten ein natürliches Modell für die konfliktfreie Beförderung eines Sets von k Fahrzeugen. Zuvor war kein effizienter Algorithmus mit einer sublinearen (in k) Approximationsgarantie für allgemeine Netzwerktopologien bekannt. Wir zeigen, dass es NP-schwer ist, eine optimale Lösung zu finden, sogar wenn das Netzwerk nur aus einem Pfad besteht. Wir präsentieren einen Algorithmus für Baum-Netzwerke, der auf dem sequentiellen Ansatz aufbaut und zu einem Fahrplan führt, der alle Fahrzeuge in Zeit O(OPT) + k ans Ziel befördert. Indem wir dieses Resultat mit Methoden aus dem Bereich der Datenbeförderung kombinieren, erhalten wir den ersten effizienten Algorithmus mit sublinearer Approximationsgarantie von O(√k). Zusätzlich präsentieren wir einen randomisierten Algorithmus der zu Lösungen der Länge O(polylog(k)) • OPT + k führt. Der Ansatz generiert Baumgraphen, die in eine komprimierte Version des Netzwerks eingebettet werden, womit eine Approximationsgarantie erreicht werden kann die unabhängig von der Graphgrösse ist. Der zweite Teil der Dissertation handelt von der Beförderungen von Fahrzeugen in Personal Rapid Transit (PRT). PRT ist ein öffentliches Verkehrsmittel in welchem Passagiere auf Verlangen durch kleine automatisierte Fahrzeuge befördert werden. Zentrale Steuerung der Fahrzeuge führt zu interessanten Möglichkeiten für die optimierte Nutzung der Schienenressourcen. Die Fahrplanerstellung für PRT ist ein Online-Problem in dem die Transportaufträge über die Zeit eintreffen. Entscheidungen müssen ebenfalls über die Zeit getroffen werden, ohne Kenntnis der zukünftigen Aufträge. Ein weiterer Unterschied zum ersten Teil der Dissertation ist, dass die Schienen in PRT nur in eine Richtung befahren werden. Die Komplexität des PRT Beförderungs- Problems und die Anforderung, dass die Fahrpläne in Echtzeit berechnet werden müssen, führt oft zur Wahl von schnellen sequentiellen Algorithmen. Die Einfachheit dieser Ansätze ist bedingt durch die Eigenschaft, dass ein geplanter Fahrplan nicht mehr geändert wird sobald er einmal berechnet wurde. Diese Eigenschaft ist gleichzeitig der grösste Nachteil eines solchen Ansatzes, da sie zu grossen Umwegen oder Verzögerungen führen kann. Eine natürliche Frage ist, wie viel man gewinnen kann wenn man adaptive Strategien verwendet. Diese Frage steht im Zentrum dieses zweiten Dissertationsteils. Zuerst stellen wir eine auf PRT zugeschnittene Variation des mathematischen Modells aus dem ersten Dissertationsteils vor. Wir zeigen, dass das Beförderungs-Problem auch in dieser Variante NP-schwer bleibt. Weiter führen wir einen Kapazitätsbegriff für PRT Netzwerke ein und beweisen eine obere Schranke für diese. Mit Hilfe von Simulationen können wir zeigen, dass die Kapazitätsschranke nicht weit vom erreichbaren Netzwerk-Durchsatz entfernt ist. Sie kann deshalb eine nützliche Grösse zur Abschätzung der Netzwerkkapazität in der Designphase von neuen PRT Systemen sein. Dann präsentieren wir einen neuen adaptiven Algorithmus, der den Fahrplan auf der Grundlage von LP Lösungen erstellt. Neue Aufträge werden gleich beim Eintreffen in das LP integriert und der Fahrplan wird neu berechnet, für alle Fahrzeuge gleichzeitig. Wir zeigen mit Hilfe von Simulationsresultaten das Potential solch adaptiver Strategien. Wir vergleichen den neuen adaptiven Ansatz mit dem sequentiellen Ansatz und mit einem einfachen dezentralisierten Algorithmus in einer Anzahl von Szenarien.

Download or read book Computational Logistics written by Tolga Bektaş and published by Springer. This book was released on 2017-10-11 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 8th InternationalConference on Computational Logistics, ICCL 2017, held in Southampton,UK, in October 2017.The 38 papers presented in this volume were carefully reviewed and selected for inclusion in the book. They are organized in topical sections entitled: vehicle routing and scheduling; maritime logistics;synchromodal transportation; and transportation, logistics and supply chain planning.

Download or read book The Evolution of the Vehicle Routing Problem written by Bruce Golden and published by Springer. This book was released on 2022-12-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents state-of-the-art research and practice in optimization routing, specifically the vehicle routing problem (VRP). Since its introduction in the late 1950s, the VRP has been a very significant area of research and practice in operations research. Vehicles are used to make deliveries and for pick-ups every day and everywhere. Companies such as Amazon, UPS, FedEx, and DHL use route optimization to reduce mileage, fuel use, number of trucks on the road, and carbon dioxide emissions. The authors compile and analyze 135 survey and review articles on vehicle routing topics published between 2005 and 2022 in an effort to make key observations about publication and trend history, summarize the overall contributions in the field, and identify trends in VRP research and practice. The authors have compiled published research on models, algorithms, and applications for specific areas, including: alternative and multiple objectives; arc routing and general routing; drones, last-mile delivery, and urban distribution; dynamic and stochastic routing; green routing; inventory routing; loading constraints; location-routing; multiple depots; pickup and delivery and dial-a-ride problems; rich and multi-attribute routing; routing over time; shipping; two-echelon, collaborative, and inter-terminal problems; specific variants, benchmark datasets, and software; and exact algorithms and heuristics. In addition, the book discusses how vehicle routing problems are among the most widely studied problems in combinatorial optimization due to the mathematical complexity and practical significance.

Download or read book Vehicle Routing for Heterogeneous Fleet written by Hing-Fai Daniel Hung and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Vehicle Routing for Heterogeneous Fleet" by Hing-fai, Daniel, Hung, 孔慶輝, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3121032 Subjects: Transportation - China - Hong Kong Algorithms

Download or read book Dynamic Vehicle Routing and Scheduling for City Delivery and Pickup written by Bhanu Haresamudra and published by . This book was released on 1997 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book VEHICLE ROUTING AT QUALITY STORES written by Candace Arai Yano, Thomas J. Chan and published by . This book was released on 1986 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: