Novetats

On radio access network slicing from a radio resource management perspective

UPCommons - dj., 07/20/2017 - 11:20
On radio access network slicing from a radio resource management perspective Sallent Roig, José Oriol; Pérez Romero, Jordi; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon Network slicing is a fundamental capability for future 5G networks to properly support current and envisioned future application scenarios. Network slicing facilitates a cost-effective deployment and operation of multiple logical networks over a common physical network infrastructure such that each network is customized to best serve the needs of specific applications (e.g., mobile broadband, Internet of Things applications) and/or communications service providers (e.g., special purpose service providers for different sectors such as public safety, utilities, smart city, and automobiles). Slicing a RAN becomes particularly challenging due to the inherently shared nature of the radio channel and the potential influence that any transmitter may have on any receiver. In this respect, this article analyzes the RAN slicing problem in a multi-cell network in relation to the RRM functionalities that can be used as a support for splitting the radio resources among the RAN slices. Four different RAN slicing approaches are presented and compared from different perspectives, such as the granularity in the assignment of radio resources and the degrees of isolation and customization.
Categories: Novetats

Sliding mode control of heterogeneous systems

UPCommons - dj., 07/20/2017 - 11:12
Sliding mode control of heterogeneous systems Domínguez Pumar, Manuel; Gorreta Mariné, Sergio; Atienza García, María Teresa; Blokhina, Elena; Pons Nin, Joan This paper establishes a link between closed-loop controls for heterogeneous systems and sliding mode controls. We demonstrate that sliding mode analysis matches with experimental results from dielectric charge controllers. This approach provides a new way to analyze the behaviour of different heterogeneous systems.
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Fuzzy logic-based energy management system design for residential grid-connected microgrids

UPCommons - dj., 07/20/2017 - 10:55
Fuzzy logic-based energy management system design for residential grid-connected microgrids ARCOS Avilés, Diego; Pascual, Julio; Marroyo Palomo, Luis; Sanchis Gúrpide, Pablo; Guinjoan Gispert, Francisco This paper presents the design of a low complexity Fuzzy Logic Controller of only 25-rules to be embedded in an Energy Management System for a residential grid-connected microgrid including Renewable Energy Sources and storage capability. The system assumes that neither the renewable generation nor the load demand is controllable. The main goal of the design is to minimize the grid power profile fluctuations while keeping the Battery State of Charge within secure limits. Instead of using forecasting-based methods, the proposed approach uses both the microgrid energy rate-of-change and the battery SOC to increase, decrease or maintain the power delivered/absorbed by the mains. The controller design parameters (membership functions and rule-base) are adjusted to optimize a pre-defined set of quality criteria of the microgrid behavior. A comparison with other proposals seeking the same goal is presented at simulation level, whereas the features of the proposed design are experimentally tested on a real residential microgrid implemented at the Public University of Navarre.
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Optimal mass transport and functional inequalities

UPCommons - dj., 07/20/2017 - 10:35
Optimal mass transport and functional inequalities Pascual Miranda, Núria We formulate the optimal transportation problem, first with Monge's original question and then with Kantorovich's approach. We state Brenier's theorem and qe define fully-nonlinear Monge-Ampère type of partial differential equations. We use these tools together with the Arithmetic Mean-Geometric Mean inequality and Hölder's inequality in order to prove some important and well-known functional inequalities: the isoperimetric inequality and Sobolev inequalities such as Gagliardo-Nirenberg-Sobolev inequality. We deduce alternative statements for the isoperimetric inequality. We establish the GNS inequality for an arbitrary norm of R^n since the Euclidean structure plays no role on this approach. We also prove the GNS inequality and the isoperimetric inequality using classical tools without optimal transport techniques. Finally, we see that the Sobolev inequality and the isoperimetric inequality are equivalent in a compact n−dimensional Riemannian manifold.
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Numerical solution of the Helmholtz Equation using high-order continuous Galerkin methods

UPCommons - dj., 07/20/2017 - 10:30
Numerical solution of the Helmholtz Equation using high-order continuous Galerkin methods Corella Pérez, Sandra We show a continuous Galerkin formulation with high-order polynomials to solve the Helmholtz equation. High-order formulations obtain solutions with less numerical error, and can use curved high-order meshes to approximate the domain. To reduce the computational requirements of the high-order formulation, we apply a static condensation technique. Using this technique, we eliminate a set of unknowns from the global linear system and therefore, we solve a smaller system of equations. Then, we recover the full solution by solving several systems that only involve the unknowns of a single element. In the examples we show that the proposed implementation converges optimally to the analytical solution both for two and three dimensional examples. We also show an application where the mesh is curved in order to better capture the geometry.
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Detecció de prominència utilitzant el moviment de persones amb visió zenital

UPCommons - dj., 07/20/2017 - 10:29
Detecció de prominència utilitzant el moviment de persones amb visió zenital Caminal Colell, Ivan La detecció de prominència d’un espai visual és una tasca que tradicionalment ha estat abordada mitjançant l’anàlisi de l’espai amb tècniques de proce ssat d’imatg e , aquestes tècniques es base n a estudiar caracter ístiques com el color, la intensitat, la forma, l’ orientació entre d’altres per acabar generant un mapa d’intensitats on ca da punt representa un nivell d’interès . De forma alternativa, e n a quest treball es pret én analitzar el moviment de persones dins un espai per tal de detectar la prominència g enerada per un grup d’objectes. La pri mera fase del treball ha consistit a captar vídeos de persones d urant una exposició a un espai amb objectes d’interès i extreure informació de ls mateixos obtenint diferents c onjunts de dades. La segona part, ha estat basada en el desenvolupament i avaluació de mètodes que utilitzen els c onjunts de dades anteriors per tal d’estimar el nivell d’interès aportat per cada objecte. Els resultats obtinguts mostren com un dels mè todes s’a costa força a unes estadístiques realit zades en la primera fase.; La detección de prominencia d e un es pacio visual es una tasca que tradicionalment e ha sido abordada mediante el análisis del espa cio con t écnicas de procesado d e imagen , estas t écnicas es tán basadas en estudiar caracter ísticas com o e l color, la intensidad , la forma, l a orientació n entre otras para finalmente genera r un mapa d e intensidades donde cada punt o representa un nivel d e interés. De forma alternativa, en este trabajo se pret ende an alizar el movimien to de persones dentro de un espacio para poder detectar la prominencia generada po r un grup o d e objetos . L a primera fase del trabajo ha consistido en captar vídeos de persona s durant e una exposició n a un espacio con objeto s de interés i extraer informació n de los mismo s obteniendo diferent e s conjunt os de datos . La segunda part e , ha sido basada en el desarrollo i avaluació n de m étodo s que utilizan los conjunt os de datos anterior e s con el fin de detectar el nivel de interés aportado por cada objeto . Los resultados o btenid os muestran como u n o de los mé todo s s e a cerca bastante a unas estad ísticas realizadas en la primera fase.; The salience detection of a visual space is a task that traditionally has been solved by the ana lysis of the space with image processing te chniques, these techniques are based on the study of specifications like color, intensity, orientation and so on to finally end with the generation of an intensity map where every point represents a level of interest. Alternatively, this project aims to an alyze the movement of people in a room with the purpose of detect ing the salience generated by a set of objects. The first phase of the project has consisted of recording people during an exposition in a space with objects of interest and extract informati on from those in order to get different data sets. The second phase, has been base d o n the d evelopment and evaluation of methods that use the previous d ata sets to estimate the interest level contributed by each object . The results show that one of the met hods is similar to the stat istics made in the first phase.
Categories: Novetats

HI-FI Hybridisable Discontinuous Galerkin method for incompressible flows

UPCommons - dj., 07/20/2017 - 10:22
HI-FI Hybridisable Discontinuous Galerkin method for incompressible flows Vila Pérez, Jordi The increasing interest in high-order discretization techniques for CFD applications is motivated by the high accuracy that these methods provide compared to low-order methods. In this project, the hybridizable discontinuous Galerkin (HDG) method is discussed. HDG represents a novel and competitive alternative to the classical discontinuous Galerkin method by substantially reducing the number of coupled unknowns of the discrete problem. Some numerical examples for the simulation of steady incompressible flows are presented, with special emphasis on the HDG stabilization term in order to ensure the optimal convergence of velocity, pressure and gradient of velocity and the superconvergence of a postprocessed velocity field.
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Trajectory control design of a mobile robot with computer vision

UPCommons - dj., 07/20/2017 - 10:06
Trajectory control design of a mobile robot with computer vision Gutiérrez Ramón, Xavier Before readings this memory, the reader has to know that it was made over the premise that the reader doesn’t have any knowledge of tracking paths by robots. The personal objective is the use of this memory in the future in the practical classes for their study or expansion. The field of mobile robot control has been the focus of active research in the past decades. On this present project, we address the concept of path tracking based on the position and orientation of the robot, basically the mobile robot has to be able to move along lines on the floor and crossings. At the end of this present memory, I did a statistical study in order to compare two methods to work and determine which one is better.
Categories: Novetats

Chaotic dynamics of the Kepler problem with variable gravitational coefficient

UPCommons - dj., 07/20/2017 - 10:00
Chaotic dynamics of the Kepler problem with variable gravitational coefficient Giralt Miron, Mar On this work we prove the presence of chaotic dynamics for the classical two-body Kepler problem with a time-periodic variable gravitational coefficient using two different methods, the stretching along the path (SAP) technique and the Melnikov method. For the SAP method, a piecewise periodic constant function is taken as the time-periodic coefficient, and the chaotic dynamics are obtained for small values of angular momentum or large periods. For the Melnikov method, a sinusoidal perturbation function is taken as the time-periodic coefficient. To guarantee chaotic dynamics big values of angular momentum or small periods of the function are necessary. The classical Melnikov method could not be applied, as the critical point of the system was parabolic, not hyperbolic. Hence, some modifications to the method have been necessary.
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Comparación de códigos de aislamiento sísmico a nivel mundial: implicaciones para Colombia

UPCommons - dt., 07/18/2017 - 11:50
Comparación de códigos de aislamiento sísmico a nivel mundial: implicaciones para Colombia López Almansa, Francisco; Piscal Arévalo, Carlos Mario El aislamiento de base constituye una estrategia eficiente para la protección sismorresistente de edificios. Esta solución consiste en el desacoplamiento entre la estructura y el suelo de fundación, mediante dispositivos altamente flexibles en las direcciones hori-zontales pero rígidos en la vertical (aisladores), de esta manera, se consigue una importante reducción de la excitación sísmica que experimentará la estructura. Actualmente esta tecnología cuenta con numerosas aplicaciones a nivel mundial, sin embargo su im-plementación difiere considerablemente entre los países con más uso de la misma, a pesar de que en todos, la amenaza sísmica es elevada. Lo anterior podría obedecer, entre otras razones, a aspectos económicos y normativos, y, en menor medida, a condiciones técnicas, culturales y coyunturales. Los países pioneros en esta tecnología han creado sus propias normas de aplicación (Japón, China, USA, Italia, etc.), evidenciándose discrepancias entre algunos de sus aspectos más relevantes. Algunas de las anteriores normas son también empleadas en varios países como Perú, Ecuador y Colombia, que remiten a los diseñadores a las normas de Estados Unidos, a pesar de que éstas no reflejan muchos de los aspectos técnicos y económicos locales, ni consideran la sismicidad propia de cada país. Por otra parte, algunos aspectos de la normativa americana actual, pueden ser considerados como excesiva-mente exigentes y no permiten incentivar el uso de esta tecnología. En este trabajo se resumen y comparan algunos aspectos im-portantes de los códigos de aislamiento sísmico de Japón, China, Italia, USA (ASCE 7-10, FEMA P-1050-1) y Chile. Ya que el análisis estático lineal es un procedimiento sencillo incorporado en las normativas, con gran importancia para el análisis y diseño de estructuras aisladas o para fijar valores límites cuando se realizan análisis más sofisticados, esta metodología se emplea para la realización de un ejemplo numérico de una edificación prototipo ubicada en Colombia, aislada mediante dispositivos elastoméricos y con uso hospitalario y residencial. Su análisis y diseño se lleva a cabo siguiendo las prescripciones de los reglamentos NSR-10 y ASCE 7-10. A efectos de comparar los resultados de este diseño con los que se obtendrían de aplicar las normas de los países considerados, se determinan los parámetros fundamentales de diseño proporcionados por dichos códigos. A partir de los resultados finales, se formulan una serie de conclusiones y recomendaciones a tenerse en cuenta en una futura implementación de un código de aislamiento sísmico para Colombia.
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Présentation Bibliothèque Campus de Terrassa

UPCommons - dt., 07/18/2017 - 10:47
Présentation Bibliothèque Campus de Terrassa Biblioteca del Campus de Terrassa La Biblioteca Campus Terrassa (BCT) ofereix el servei de podcast com a alternativa a conèixer els diferents espais, serveis i recursos d'informació que el Servei de Biblioteques i Documentació posa al vostre abast. Ce podcast informe des espaces et les services qui s'offrent en BCT.
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Disclosure day on relativity: a science activity beyond the classroom

UPCommons - dt., 07/18/2017 - 10:45
Disclosure day on relativity: a science activity beyond the classroom Aragoneses, Andrés; Salán Ballesteros, Maria Núria; Hernández Fernández, Antonio An important goal for students in engineering education is the ability to present and defend a project in front of a technical audience. We have designed an activity for helping students to work the independent learning and communication skills, while they are introduced in the dynamics of a conference. In this activity, students prepare and present a poster at a popular physics conference on relativity. This activity is shown to provide them with communication skills, related to generic skills at the core of Universitat Politècnica de Catalunya (UPC) degrees, and which are relevant in most of the duties of an engineer.
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El Servicio de Información Especializada

UPCommons - dt., 07/18/2017 - 10:43
El Servicio de Información Especializada Biblioteca del Campus de Terrassa La Biblioteca Campus Terrassa (BCT) ofereix el servei de podcast com a alternativa a conèixer els diferents espais, serveis i recursos d'informació que el Servei de Biblioteques i Documentació posa al vostre abast. Este podcast informa sobre el funcionamiento del Servicio de Información Especializada.
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El Servei d'Informació Especialitzada

UPCommons - dt., 07/18/2017 - 10:39
El Servei d'Informació Especialitzada Biblioteca del Campus de Terrassa La Biblioteca Campus Terrassa (BCT) ofereix el servei de podcast com a alternativa a conèixer els diferents espais, serveis i recursos d'informació que el Servei de Biblioteques i Documentació posa al vostre abast. Aquest podcast informa sobre el funcionament del Servei d'Informació Especialitzada.
Categories: Novetats

El servicio de préstamo

UPCommons - dt., 07/18/2017 - 10:36
El servicio de préstamo b La Biblioteca Campus Terrassa (BCT) ofereix el servei de podcast com a alternativa a conèixer els diferents espais, serveis i recursos d'informació que el Servei de Biblioteques i Documentació posa al vostre abast. Este podcast informa de como reservar un libro o documento, los distintos tipos de préstamos y de las normas que se deben cumplir.
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El servei de prèstec

UPCommons - dt., 07/18/2017 - 10:33
El servei de prèstec Biblioteca del Campus de Terrassa La Biblioteca Campus Terrassa (BCT) ofereix el servei de podcast com a alternativa a conèixer els diferents espais, serveis i recursos d'informació que el Servei de Biblioteques i Documentació posa al vostre abast. Aquest podcast informa de com reservar un llibre o document, dels diferents tipus de prèstecs i les normes que s'han de seguir.
Categories: Novetats

The TUCAN3G project: wireless technologies for isolated rural communities in developing countries based on 3G small-cell deployments

UPCommons - dt., 07/18/2017 - 10:32
The TUCAN3G project: wireless technologies for isolated rural communities in developing countries based on 3G small-cell deployments Martínez Fernández, Andrés; Vidal Manzano, José; Simó Reigadas, Javier; Prieto Egido, Ignacio; Agustín de Dios, Adrián; Paco, Juan; Rendón, Álvaro Recent years have witnessed a massive penetration of cellular systems in developing countries. However, isolated rural areas (sparsely inhabited by low-income population) have been disregarded because classical access and backhaul technologies do not ensure the return on investment. This article presents innovative techno-economical solutions to provide these areas with cellular voice and data services. We first analyze the general characteristics of isolated rural communities, and based on this information, low-cost solutions are designed for both access (using 3G access points) and backhaul networks (using non-carrier grade equipment as WiFi for long distances or WiMAX in non-licensed bands). Subsequently, a study of population-dependent income vs. costs is presented, and a new business model is proposed involving mobile network operators, rural operators, and infrastructure providers. In order to test these solutions, we have built two demonstration platforms in the Peruvian jungle that have allowed validation of the technical feasibility of the solution, verifying the business model assumptions and the scalability of the initiative.
Categories: Novetats

Plagi

UPCommons - dt., 07/18/2017 - 10:30
Plagi Biblioteca del Campus de Terrassa La Biblioteca Campus Terrassa (BCT) ofereix el servei de podcast com a alternativa a conèixer els diferents espais, serveis i recursos d'informació que el Servei de Biblioteques i Documentació posa al vostre abast. En aquest podcast s'informa de què es considera plagiar i de com podem evitar el plagi.
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Biblioteca Campus de Terrassa Presentation

UPCommons - dt., 07/18/2017 - 10:23
Biblioteca Campus de Terrassa Presentation Biblioteca del Campus de Terrassa La Biblioteca Campus Terrassa (BCT) ofereix el servei de podcast com a alternativa a conèixer els diferents espais, serveis i recursos d'informació que el Servei de Biblioteques i Documentació posa al vostre abast. This podcast informs about the BCT's spaces and services.
Categories: Novetats

CÀLCUL INFINITESIMAL

UPC OpenCourseware - dl., 07/17/2017 - 00:00
Objectiu: Assolir seguretat i destresa en l'ús dels conceptes i tècniques del càlcul diferencial i integral de funcions d'una variable real. Utilitzar  les tècniques bàsiques de representació i anàlisi de funcions de dues variables.
Categories: Novetats

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