All-Optical Label Stacking: Easing the Trade-offs Between Routing and Architecture Cost in All-Optical Packet Switching

All-optical label swapping (AOLS) forms a key technology towards the implementation of all-optical packet switching nodes (AOPS) for the future optical Internet. The capital expenditures of the deployment of AOLS increases with the size of the label spaces (i.e. the number of used labels), since a special optical device is needed for each recognized label on every node. Label space sizes are affected by the way in which demands are routed. For instance, while shortest-path routing leads to the usage of fewer labels but high link utilization, minimum interference routing leads to the opposite. This paper studies all-optical label stacking (AOLStack), which is an extension of the AOLS architecture. AOLStack aims at reducing label spaces while easing the compromise with link utilization. In this paper, an integer lineal program is proposed with the objective of analyzing the softening of the aforementioned trade-off due to AOLStack. Furthermore, a heuristic aiming at finding good solutions in polynomial-time is proposed as well. Simulation results show that AOLStack either a) reduces the label spaces with a low increase in the link utilization or, similarly, b) uses better the residual bandwidth to decrease the number of labels even more

Lecture 2 - Java

Programming Overview The JVM (The Java Virtual Machine) A brief look at Structure Class Method Statement Magic incantations main() output Coding a Dog Programming Principle(1) If and Boolean operations Coding a Bank Account Quick look at ToolBox

Exercise sheet 3

Exercises and solutions in LaTex

MA167exam00pdf

Exam questions and solutions in PDF

MA167exam00

Exam questions and solutions in LaTex. Diagrams for the questions are all together in the support.zip file, as .eps files

Exercise sheet 3 pdf

Exercises and solutions in PDF

MA160exam00

Exam questions and solutions in LaTex. Diagrams for the questions are all together in the support.zip file, as .eps files

MA160exam00pdf

Exam questions and solutions in PDF

MSc Audiology library induction, 2010

Library induction given to the postgraduate audiology students in October 2010. Session covers an introduction to the Hartley library including Library of Congress classification, finding items from reading lists, print journals, e-journals, search strategies including boolean operators and truncation and using online databases, in particular Web of Science.

MSc Sound & Vibration Library Induction, October 2010

Library induction and information skills for MSc Sound and Vibration, given in October 2010. As well as an introduction to the hartley Library and the LoC classification scheme, it covers finding material from reading lists, e-journals, making up search strategies and searching online databases using boolean operators.

Hartley Library Search Planner

This 2-page planner will help students search databases more effectively using Boolean logic

Análisis bibliométrico sobre la inclusión de niños, niñas y adolescentes con discapacidad haciendo uso de la música como herramienta central

Objetivo: identificar evidencia bibliográfica del uso de la música como herramienta en procesos de inclusión de personas con discapacidad, que permitiera ofrecer sustento teórico al proyecto del convenio establecido entre la Fundación Saldarriaga Concha y la Fundación Nacional Batuta. Materiales y métodos: como estrategia de búsqueda se utilizaron los temas “música”, “inclusión” y “discapacidad” y el booleano AND en tres bases de datos: Ebsco, Medline y Lilacs. Los análisis fueron realizados mediante el establecimiento de frecuencias para variables como revista, país, tipo de estudio y años de publicación. Se localizaron veintidós artículos que incluyeron los criterios de búsqueda definidos por los autores. Resultados: los resultados muestran que la mayoría de publicaciones se encuentra en la base de datos Ebsco, en la revista Music Educators Journal, en el período comprendido entre el año 2004 a 2006 (40,9%). Estados Unidos es el país que más publicaciones ha realizado (81,8%). El tipo de estudio más frecuente es la revisión de tema (86,4%) y la temática más utilizada incorpora aspectos como música-discapacidad. De acuerdo con Rumbo, Aranton y García, el grado de evidencia de los documentos analizados es 3, lo que indica que son principalmente estudios descriptivos y de opinión de expertos. Conclusiones: después de realizar la búsqueda sistemática se puede concluir que las publicaciones que incorporan el uso de la música como herramienta para facilitar procesos de inclusión social de niños y adolescentes es escasa, por lo que se sugiere sistematizar y publicar resultados de las intervenciones en este campo de la Terapia Ocupacional. El presente documento proporciona una posible ruta para el desarrollo de futuras investigaciones referentes al tema.

Parametric pension reform and the intensive margin of labor supply, evidence from Colombia

We analyze the effect of a parametric reform of the fully-funded pension regime in Colombia on the intensive margin of the labor supply. We take advantage of a threshold defined by law in order to identify the causal effect using a regression discontinuity design. We find that a pension system that increases retirement age and the minimum weeks during which workers must contribute to claim pension benefits causes an increase of around 2 hours on the number of weekly worked hours; this corresponds to 4% of the average number of weekly worked hours or around 14% of a standard deviation of weekly worked hours. The effect is robust to different specifications, polynomial orders and sample sizes.