Optimization Based Methods For Revising Train Timetables With Focus On Robustness

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Optimization Based Methods For Revising Train Timetables With Focus On Robustness

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Author : Fahimeh Khoshniyat
language : en
Publisher: Linköping University Electronic Press
Release Date : 2016-12-01

Optimization Based Methods For Revising Train Timetables With Focus On Robustness written by Fahimeh Khoshniyat and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-12-01 with categories.

With increase in the use of railway transport, ensuring robustness in railway timetables has never been this important. In a dense railway timetable even a small disturbance can propagate easily and affect trains' arrival and departure times. In a robust timetable small delays are absorbed and knock-on effects are prevented effectively. The aim of this thesis is to study how optimization tools can support the generation of robust railway traffic timetables. We address two Train Timetabling Problems (TTP) and for both problems we apply Mixed Integer Linear Programming (MILP) to solve them from network management perspectives. The first problem is how robustness in a given timetable can be assessed and ensured. To tackle this problem, a headway-based method is introduced. The proposed method is implemented in real timetables and evaluated from performance perspectives. Furthermore, the impact of the proposed method on capacity utilization, heterogeneity and the speed of trains, is monitored. Results show that the proposed method can improve robustness without imposing major changes in timetables. The second problem addressed in the thesis is how robustness can be assessed and maintained in a given timetable when allocating additional traffic and maintenance slots. Different insertion strategies are studied and their consequences on capacity utilization and on the properties of the timetables are analyzed. Two different insertion strategies are considered: i) simultaneous and ii) stepwise insertion. The results show that inserting the additional trains simultaneously usually results in generating more optimal solutions. However, solving this type of problem is computationally challenging. We also observed that the existing robustness metrics cannot capture the essential properties of having more robust timetables. Therefore we proposed measuring Channel Width, Channel Width Forward, Channel Width Behind and Track Switching. Furthermore, the experimental analysis of the applied MILP model shows that some cases are computationally hard to solve and there is a need to decrease the computation time. Hence several valid inequalities are developed and their effects on the computation time are analyzed. This thesis contains three papers which are appended. The results of this thesis are of special interests for railway traffic planners and it would support their working process. However, railway traffic operators and passengers also benefit from this study.

Operations Research Models For Scheduling Railway Infrastructure Maintenance

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Author : Gabriella Budai-Balke
language : en
Publisher: Rozenberg Publishers
Release Date : 2009

Operations Research Models For Scheduling Railway Infrastructure Maintenance written by Gabriella Budai-Balke and has been published by Rozenberg Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

This thesis can be divided into two parts. In Part I we are dealing with the problem of finding optimal time intervals for carrying out routine maintenance works and large projects in such a way that the track possession costs and maintenance costs are minimized. In Part II of this thesis we focus on rescheduling of the rolling stock in the passenger railways due to changing circumstances and more precisely on the Rolling Stock Rebalancing Problem (RSRP). The main objectives of this thesis are formulated as follows: 1. Review the existing literature on maintenance planning in relation with production. 2. Identify some tactical and operational railway infrastructure maintenance planning problems and develop operations research models for providing decision support. Investigate the effect of planning railway infrastructure maintenance on the train operation and identify rolling stock planning problems that occur during planned infrastructure maintenance. 3. Analyze the considered models, investigate their computational complexity, propose solution methods and test the solutions of the models.

Improving Healthcare Quality In Europe Characteristics Effectiveness And Implementation Of Different Strategies

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Author : OECD
language : en
Publisher: OECD Publishing
Release Date : 2019-10-17

Improving Healthcare Quality In Europe Characteristics Effectiveness And Implementation Of Different Strategies written by OECD and has been published by OECD Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-17 with categories.

This volume, developed by the Observatory together with OECD, provides an overall conceptual framework for understanding and applying strategies aimed at improving quality of care. Crucially, it summarizes available evidence on different quality strategies and provides recommendations for their implementation. This book is intended to help policy-makers to understand concepts of quality and to support them to evaluate single strategies and combinations of strategies.

Parenting Matters

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Author : National Academies of Sciences, Engineering, and Medicine
language : en
Publisher: National Academies Press
Release Date : 2016-11-21

Parenting Matters written by National Academies of Sciences, Engineering, and Medicine and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-11-21 with Social Science categories.

Decades of research have demonstrated that the parent-child dyad and the environment of the familyâ€"which includes all primary caregiversâ€"are at the foundation of children's well- being and healthy development. From birth, children are learning and rely on parents and the other caregivers in their lives to protect and care for them. The impact of parents may never be greater than during the earliest years of life, when a child's brain is rapidly developing and when nearly all of her or his experiences are created and shaped by parents and the family environment. Parents help children build and refine their knowledge and skills, charting a trajectory for their health and well-being during childhood and beyond. The experience of parenting also impacts parents themselves. For instance, parenting can enrich and give focus to parents' lives; generate stress or calm; and create any number of emotions, including feelings of happiness, sadness, fulfillment, and anger. Parenting of young children today takes place in the context of significant ongoing developments. These include: a rapidly growing body of science on early childhood, increases in funding for programs and services for families, changing demographics of the U.S. population, and greater diversity of family structure. Additionally, parenting is increasingly being shaped by technology and increased access to information about parenting. Parenting Matters identifies parenting knowledge, attitudes, and practices associated with positive developmental outcomes in children ages 0-8; universal/preventive and targeted strategies used in a variety of settings that have been effective with parents of young children and that support the identified knowledge, attitudes, and practices; and barriers to and facilitators for parents' use of practices that lead to healthy child outcomes as well as their participation in effective programs and services. This report makes recommendations directed at an array of stakeholders, for promoting the wide-scale adoption of effective programs and services for parents and on areas that warrant further research to inform policy and practice. It is meant to serve as a roadmap for the future of parenting policy, research, and practice in the United States.

Who Guidelines On Hand Hygiene In Health Care

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Author : World Health Organization
language : en
Publisher: World Health Organization
Release Date : 2009

Who Guidelines On Hand Hygiene In Health Care written by World Health Organization and has been published by World Health Organization this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with House & Home categories.

The WHO Guidelines on Hand Hygiene in Health Care provide health-care workers (HCWs), hospital administrators and health authorities with a thorough review of evidence on hand hygiene in health care and specific recommendations to improve practices and reduce transmission of pathogenic microorganisms to patients and HCWs. The present Guidelines are intended to be implemented in any situation in which health care is delivered either to a patient or to a specific group in a population. Therefore, this concept applies to all settings where health care is permanently or occasionally performed, such as home care by birth attendants. Definitions of health-care settings are proposed in Appendix 1. These Guidelines and the associated WHO Multimodal Hand Hygiene Improvement Strategy and an Implementation Toolkit (http://www.who.int/gpsc/en/) are designed to offer health-care facilities in Member States a conceptual framework and practical tools for the application of recommendations in practice at the bedside. While ensuring consistency with the Guidelines recommendations, individual adaptation according to local regulations, settings, needs, and resources is desirable. This extensive review includes in one document sufficient technical information to support training materials and help plan implementation strategies. The document comprises six parts.

Optimization Of Train Timetables In High Speed Railway Corridors Considering Passenger Departure Time And Price Preferences

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Author : Zhipeng Huang
language : en
Publisher:
Release Date : 2023

Optimization Of Train Timetables In High Speed Railway Corridors Considering Passenger Departure Time And Price Preferences written by Zhipeng Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.

In a high-speed railway (HSR) corridor, diverse train services are provided by railway companies. These different trains' features own various attributes (e.g., departure time, running speed, and fare) being the basis and focus for passengers deciding their travel. Besides, passenger's varying preference always leads to a diversity of their decision. Focusing on this problem, this paper proposed a train timetable optimization model based on departure time and pricing strategy to further analyze their impact on passengers' travel choices with a consistent operating speed, and to construct an extended time-space-fare network to visualize this process. The generalized cost of each arc in the network will be applied as a criterion for evaluating passenger selection. Then, we adapt a passenger flow allocation method based on the user equilibrium (UE) principle to allocate passenger flow to each train. Finally, a bi-level planning model is designed, where the passenger allocation is performed as the lower-level model, and the timetable decision is the upper-level one to optimize collaboratively. Moreover, a genetic algorithm integrated with the Frank-Wolfe method is designed to seek the optimal timetable and pricing strategy, and a concrete numerical example in Lanzhou-Xi'an HSR is taken to investigate the effectiveness of both the model and the algorithm.

A Simulation Optimization Approach For Improved Robustness Of Railway Timetables

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Author : Johan Högdahl
language : en
Publisher:
Release Date : 2019

A Simulation Optimization Approach For Improved Robustness Of Railway Timetables written by Johan Högdahl and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

Improving Timetable Robustness And Punctuality Of Railway Traffic

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Author : Johan Högdahl
language : en
Publisher:
Release Date : 2022

Improving Timetable Robustness And Punctuality Of Railway Traffic written by Johan Högdahl and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.

Linear Optimization Models For Robust Railway Network Design Based On Strategic Timetables

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Author : Tim Sander
language : en
Publisher:
Release Date : 2024

Linear Optimization Models For Robust Railway Network Design Based On Strategic Timetables written by Tim Sander and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024 with categories.

Robust And Online Large Scale Optimization

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Author : Ravindra K. Ahuja
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-10-26

Robust And Online Large Scale Optimization written by Ravindra K. Ahuja and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-10-26 with Computers categories.

Scheduled transportation networks give rise to very complex and large-scale networkoptimization problems requiring innovative solution techniques and ideas from mathematical optimization and theoretical computer science. Examples of scheduled transportation include bus, ferry, airline, and railway networks, with the latter being a prime application domain that provides a fair amount of the most complex and largest instances of such optimization problems. Scheduled transport optimization deals with planning and scheduling problems over several time horizons, and substantial progress has been made for strategic planning and scheduling problems in all transportation domains. This state-of-the-art survey presents the outcome of an open call for contributions asking for either research papers or state-of-the-art survey articles. We received 24 submissions that underwent two rounds of the standard peer-review process, out of which 18 were finally accepted for publication. The volume is organized in four parts: Robustness and Recoverability, Robust Timetabling and Route Planning, Robust Planning Under Scarce Resources, and Online Planning: Delay and Disruption Management.