59 research outputs found
Measuring journey time reliability in London using automated data collection systems
No full textThesis (S.M. in Transportation)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2012.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student submitted PDF version of thesis.Includes bibliographical references (p. 161-162).Service reliability is critical for both users and operators of transit systems. The rapid spread of Automated Data Collection Systems, such as Automated Fare Collection (AFC) and Automatic Vehicle Location (AVL), provides new sources of information that can be used to measure and assess service reliability. The main objective of this thesis is to develop a set of simple, customer-driven metrics of journey time reliability, that could be useful and meaningful for both customers and operators. The set of metrics are consistent across transit modes (rail and bus networks). The proposed methodology, common to rail and bus systems, consists of (1) an analysis of the journey time distributions at the finest spatial and temporal resolution, the origin-destination pair (O-D) and time period level (customer perspective), (2) the aggregation of the reliability metrics at the line (route) level (operator perspective), and (3) the definition of journey time reliability standards at the O-D pair and time period level, by the identification of a representative "good" journey time distribution (both customer and operator perspective). For fully gated transit systems, like the London Underground, AFC data provides direct travel time measures for every journey from the fare gate at the entry station to the fare gate at the exit station. For non-gated systems, such as many bus networks, no information is available on passengers' arrival times at the origin bus stop. A method that combines AVL and AFC data is proposed to estimate waiting times at stops so that they can be included in the journey time reliability calculation. Furthermore, the method accounts for the multiple overlapping routes that sometimes serve the same O-D pairs. The proposed methodology is tested using the London public transport system as an illustration. The use of the reliability metrics for operators and customers is also discussed, with proposed modifications of the information provided by journey planners.by Mickaël Schil.S.M.in Transportatio
Between the earth and a hard place : John Ray's inquiry into the dissolution of the world in Miscellaneous Discourses (1692)
No full textMickaël Popelard (Université de Caen Normandie) [télécharger la proposition] As a fellow of the Royal Society and the author of several botanical treatises, including the Methodus plantarum nova (1682) and the three volumes of the Historia generalis plantarum (1686, 1688, 1704), John Ray (1627-1705) is sometimes presented as "the father of natural history" (as his blue plaque in Black Notley, Essex, proudly proclaims). But he is also the author of the Miscellaneous Discourses, a curious book ..
Annotated translation: Le grand roman des maths: de la préhistoire à nos jours (Mickaël Launay, Flammarion, Paris 2016, p. 123-163)
No full textThis bachelor thesis consists of two parts. The first part contains a Czech translation of chapters 8, 9 and part of chapter 10 from the popular science book Le grand roman des maths: de la préhistoire à nos jours by the French author Mickaël Launay. The book deals with the history of mathematics and the selected chapters named "La force des triangles", "Vers l'inconnue" and "À la suite" focus on trigonometry, equations and number sequences respectively. The second part of this thesis consists of a translation commentary, which includes a detailed translation analysis of the source text, a description of the translation method and a reflection on selected translation problems and their solutions.Tato bakalářská práce sestává ze dvou částí. První část tvoří český překlad 8., 9. a části 10. kapitoly z populárně-naučné knihy Le grand roman des maths: de la préhistoire à nos jours od francouzského autora Mickaëla Launayho. Publikace se zabývá dějinami matematiky a zvolené kapitoly s názvy "La force des triangles", "Vers l'inconnue" a "À la suite" jsou zaměřeny popořadě na trigonometrii, rovnice a číselné posloupnosti. Druhou část práce tvoří odborný komentář, který zahrnuje podrobnou překladatelskou analýzu výchozího textu, popis metody překladu a reflexi vybraných překladatelských problémů a jejich řešení.Institute of Translation StudiesÚstav translatologieFilozofická fakultaFaculty of Art
La culture matérielle dans les sources judiciaires de la fin du Moyen Âge (de la Brie au comté de Foix)
No full textInternational audienceWhile the studies medieval material culture used mainly of the post-mortem inventories as source, the author suggests observing it through the judicial archives. This latter, with the events of the everyday life which they bring back, allow to look a material culture in movement. Then, we can understand the importance of the circulation of objects inside the village community, but also describe the modes of storage. Finally, by the diversity of the reported situations, we can sketch a sociology of the material culture and measure the concrete consequences of the differences in wealth.Alors que les études sur la culture matérielle médiévale ont privilégié l’utilisation des inventaires après-décès comme sources, l’auteur se propose de l’observer à travers les archives judiciaires. Ces dernières, grâce aux événements du quotidien qu’elles rapportent, permettent d’envisager une culture matérielle en mouvement. On peut en effet grâce à elle comprendre l’importance de la circulation des objets à l’intérieur de la communauté villageoise, mais aussi décrire les modes de rangement. Enfin, par la diversité des situations rapportées, on peut esquisser une sociologie de la culture matérielle et mesurer les conséquences concrètes des écarts de fortune
Diálogos en guaraní, un manuscrit inédit des réductions jésuites du Paraguay (XVIIIe siècle)
No full textInternational audienceCecilia Adoue, Capucine Boidin, Mickaël Orantin, Diálogos en guaraní, un manuscrit inédit des réductions jésuites du Paraguay (XVIII e siècle) Résumé Dialogos en guarani 'Dialogues en guarani', est le nom en espagnol que donne la pièce de titre située au dos de la reliure d'un manuscrit monolingue en guarani. Un inédit contenant 283 pages de texte non numérotées. Il contient 88 titres de chapitre. Magnifiquement relié et doré sur tranche, ce manuscrit en parfait état de conservation a été identifié par l'équipe du projet ANR LANGAS dans une bibliothèque de Luján (Argentine) en mai 2013 et numérisé en novembre 2014. Sans nom d'auteur, ni date et présentant plusieurs calligraphies, l'origine, les objectifs et les usages de ce recueil font l'objet de plusieurs hypothèses. Par son papier, son encre, sa calligraphie, et son orthographe, il date probablement du début du XVIII e siècle, une époque d'apogée économique et culturelle au sein des réductions jésuites du Paraguay (1609-1767). Cet article retrace brièvement la trajectoire du manuscrit, situe ce dernier dans l'ensemble du corpus actuellement connu, le compare avec une autre copie partielle du même texte, réalisée au XIX e siècle en Allemagne. Avec la traduction de quelques extraits, nous présenterons les nouvelles perspectives de recherche qu'il ouvre et qui seront explorées par l'équipe LANGAS dans les années à venir. Abstract Dialogos en guarani is the spanish title embossed on the spine label of a beautifully bound, gilt-edged monolingual guarani manuscript of 283 pages and 88 chapter headlines. This perfectly well kept manuscript has been identified by ANR LANGAS project team in a library of Luján (Argentina) in may 2013, and digitalized in November 2014. Without any mention of author nor date, written by different hands, its origin, objectives and uses arise several hypothesis. Its paper, ink, calligraphies and orthography drive us to date it at the beginning of XVIII century, a period of economical and cultural apogee within the Jesuit reductions in Paraguay (1609-1767). This article briefly draws up the trajectory of the manuscript, places it within the whole of the corpus known at this stage, and compares it with a partial copy of the same text, made in Germany in XIX century. Together with the translation of a few excerpts, we intend to present new research perspectives open by this document and that should be explored by LANGAS team in the coming years
On generalized series fields and exponential-logarithmic series fields with derivations
No full textWe survey some important properties of fields of generalized series and of exponential-logarithmic series, with particular emphasis on their possible differential structure, based on a joint work of the author with S. Kuhlmann [KM12b,KM11]
ASO Author Reflections: Surgical Strategy for Bilobar Colorectal Liver Metastases with Vascular Invasion
No full textInternational audienc
Efficient and Expressive Microfacet Models
No full textTitle: Efficient and Expressive Microfacet Models Author: Asen Atanasov Department: Department of Software and Computer Science Education Supervisor: doc. Dr. Alexander Wilkie, Department of Software and Computer Science Education Abstract: In realistic appearance modeling, rough surfaces that have micro- scopic details are described using so-called microfacet models. These include analytical models that statistically define a physically-based microsurface. Such models are extensively used in practice because they are inexpensive to compute and offer considerable flexibility in terms of appearance control. Also, small but visible surface features can easily be added to them through the use of a normal map. However, there are still areas in which this general type of model can be improved: important features like anisotropy control sometimes lack analytic solutions, and the efficient rendering of normal maps requires accurate and general filtering algorithms. We advance the state of the art with regard to such models in these areas: we derive analytic anisotropic models, reformulate the filtering problem and propose an efficient filtering algorithm based on a novel filtering data structure. Specifically, we derive a general result in microfacet theory: given an arbitrary microsurface defined via standard..
Almost Sure Existence of Global Solutions for supercritical Semilinear Wave Equations
No full textWe prove that for almost every initial data (u0, u1) ∈ H s × H s−1 with s > p−3 p−1 there exists a global weak solution to the supercritical semilinear wave equation ∂ 2 t u − ∆u + |u| p−1 u = 0 where p > 5, in both R 3 and T 3. This improves in a probabilistic framework the classical result of Strauss [16] who proved global existence of weak solutions associated to H 1 × L 2 initial data. The proof relies on techniques introduced by T. Oh and O. Pocovnicu in [13] based on the pioneer work of N. Burq and N. Tzvetkov in [5]. We also improve the global well-posedness result in [17] for the subcritical regime p < 5 to the endpoint s = p−3 p−1. Acknowledgement The author warmly thanks Nicolas Burq and Isabelle Gallagher for careful advising during this work and suggesting this problem
Construction of High Regularity Invariant Measures for the 2D Euler Equations and Remarks on the Growth of the Solutions
No full textWe consider the Euler equations on the two-dimensional torus and construct
invariant measures for the dynamics of these equations, concentrated on
sufficiently regular Sobolev spaces so that strong solutions are also known to
exist. The proof follows the method of Kuksin and we obtain in particular that
these measures do not have atoms, excluding trivial invariant measures. Then we
prove that almost every initial data with respect to the constructed measures
give rise to global solutions for which the growth of the Sobolev norms are at
most polynomial. To do this, we rely on an argument of Bourgain. Such a
combination of Kuksin's and Bourgain's arguments already appears in the work of
Sy. We point out that up to the knowledge of the author, the only general upper
bound for the growth of the Sobolev norm to the Euler equations is double
exponential.Comment: Final versio
- …
