6,369 research outputs found
An Improved Train Classification Procedure for the Hump Yard Lausanne Triage
No full textIn this paper we combine an integer programming approach
and a computer simulation tool to successfully develop and verify an
improved classification schedule for a real-world train classification instance.
First, we derive an integer program for computing train classification
schedules based on an earlier developed bitstring representation of
such schedules. We show how to incorporate various practical restrictions
in this model. Secondly, we apply the model to one day of traffic data
of the Swiss classification yard Lausanne Triage. We incorporate all the
operational and infrastructural restrictions of this yard instance in our
integer program. Even with this high number of restrictions, we are able
to compute a schedule that saves a full sorting step and one track compared
to the currently applied procedure. We finally show this improved
schedule is applicable in practice by a thorough computer simulation
The Future of Canadian Climate Policy — with Marc Lee
No full textMarc Lee is a Senior Economist at the Canadian Centre for Policy Alternatives\u27 BC Office. In addition to tracking federal and provincial budgets and economic trends, Marc has published on a range of topics from poverty and inequality to globalization and international trade to public services and regulation. Marc is the Co-Director of the Climate Justice Project, a research partnership with UBC\u27s School of Community and Regional Planning that examines the links between climate change policies and social justice.Resources:Climate Justice Project: www.policyalternatives.ca/projects/cli…tice-projectMarc Lee\u27s Posts on Policy Note: www.policynote.ca/author/marclee/Canadian Centre for Policy Alternatives: www.policyalternatives.ca/Marc\u27s Twitter: twitter.com/MarcLeeCCPA International Panel on Climate Change, 2021 report: www.ipcc.ch/report/ar6/wg1
11. Multistage Methods for Freight Train Classification
No full textIn this paper we establish a consistent encoding of freight train classification methods.
This encoding scheme presents a powerful tool for efficient presentation and analysis of classification methods, which we successfully apply to illustrate the most relevant historic results from a more theoretical point of view.
We analyze their performance precisely and develop new classification methods making use of the inherent optimality condition of the encoding.
We conclude with deriving optimal algorithms and complexity results for restricted real-world settings
Climate Justice & Inequality: The Future of Canadian Climate Policy — with Marc Lee
No full textMarc Lee is a Senior Economist at the Canadian Centre for Policy Alternatives\u27 BC Office. In addition to tracking federal and provincial budgets and economic trends, Marc has published on a range of topics from poverty and inequality to globalization and international trade to public services and regulation. Marc is the Co-Director of the Climate Justice Project, a research partnership with UBC\u27s School of Community and Regional Planning that examines the links between climate change policies and social justice.Resources: Climate Justice Project: https://www.policyalternatives.ca/projects/climate-justice-projectMarc Lee\u27s Posts on Policy Note: https://www.policynote.ca/author/marclee/Canadian Centre for Policy Alternatives: https://www.policyalternatives.ca/Marc\u27s Twitter: https://twitter.com/MarcLeeCCPA International Panel on Climate Change, 2021 report: https://www.ipcc.ch/report/ar6/wg1
UKMARC AMC: Draft Rev 4.0: UK MARC format for archives and manuscripts control (UK MARC AMC)
No full textThis draft is the first attempt to establish a UK MARC specifically for Archives and Manuscripts Control since the British Library indicated that it would countenance such extensions to the national UK MARC format. In order to keep consistency with the general UK MARC format, standard UK MARC subject fields are not included in this document, since they should be taken from the latest version of the UK MARC manual. {A note of them should perhaps be included in UK MARC AMC.} {NB Text in braces is intended to be explanatory material for readers of this draft}. Certain other fields have not been included that might occasionally be used in the cataloguing of archival materials but would generally only be used for such materials in organizations which were combining archive
databases with library databases. This MARC version is intended for use with descriptions of archive or anuscript material that follow, or fit, the traditional style of cataloguing: we assume that these will normally relate
to paper or parchment originals. It is not intended for use with descriptions of other kinds of material. For these, fields may be drawn from the appropriate UK MARC document. MARC versions for use with archives in special formats should be developed, in order to complete the full range of facilities available to archivists and curators
Optimizing the cargo express service of Swiss Federal Railways
No full textThe Cargo Express service of Swiss Federal Railways (SBB Cargo) offers fast overnight
transportation of goods between selected train stations in Switzerland and is currently operated as a two-hub and spoke system. We present three different models for planning the operation of this service as a whole. All models capture the underlying optimization problem with a high level of detail: Traffic routing, train routing, make-up, scheduling, and locomotive assignment are all addressed.
At the same time we respect hard constraints like tight service time windows, and train and yard capacities. To the best of our knowledge, such an integration of planning steps into one exact approach has not been successfully attempted before. We describe our approaches for obtaining provably good quality solutions. Our algorithmic techniques involve branch-and-cut, branch-andprice as well as problem specific exact and heuristic acceleration methods. We conclude our study with computational results on realistic data
MARC 21 para recursos contínuos
No full textTranslation and adaptation of the MARC 21 Format for Bibliographic Data, and MARC 21 Format for Holdings Data, Network Development and MARC Standards Office, Library of Congress, USA, by Angela Salles. Rio de Janeiro, 2010. 2 v. V.1 MARC 21 format for bibliographic data (updated until October 2010). V.2 MARC 21 format for data collection (Holdings) (updated until October 2008)
Algorithm Design and Analysis of Problems in Manufacturing, Logistics, and Telecommunications: An Algorithmic Jam Session
No full textThe focus of this thesis is on algorithmic questions that are directly linked to practical problems from diverse applications like manufacturing, train scheduling or telecommunications. We present four problem settings together with combinatorial problems (or mathematical models) that are at the core of the practical applications. From this we derive both interesting theoretical and relevant practical results, which we back up by experiments. In detail, the topics of this thesis are as follows
MARC 21 para recursos contínuos.
No full textTradução e adaptação de MARC 21 Format for Bibliographic Data e MARC 21 Format for Holdings Data, da Network Development and MARC Standards Office, da Library of Congress, USA, por Angela Salles
Friends of the Greenwood Library Presents Marc Leepson
No full textOn Tuesday, September 11, 2012 the Friends of the Janet D. Greenwood Library hosted its fall event, which featured an evening with Marc Leepson. Leepson is a journalist, historian and the author of seven books, including Lafayette: Lessons in Leadership from the Idealist General (Palgrave/Macmillan, 2011), a concise biography of the famed Marquis de Lafayette
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