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Imagen de apoyo de  Energy management of a hybrid electric vehicle: an approach based on type-2 fuzzy logic

Energy management of a hybrid electric vehicle: an approach based on type-2 fuzzy logic

Por: Javier Solano Martínez | Fecha: 2012

One of the effects of the globalisation of our society is that people travel more covering longer distances, live far from their work place and consume goods from all around the world. Therefore, it is no coincidence that the transport of people and goods represents more than 25\% of the energy consumption and is one of the principal sources of pollution worldwide. Several efforts must be done to reduce the oil dependence, the energy consumption and the environmental impact of transport systems. In this perspective, the French Army (DGA) has designed and constructed the Electrical Chain Components Evaluation vehicle (ECCE). It is a mobile laboratory to evaluate under real conditions the electric components of Hybrid Electrical Vehicles (HEVs) that reduce the energy consumption and the pollution emission of conventional vehicles. ECCE permits evaluating different energy sources such as batteries, fuel cells, internal combustion engines, ultracapacitors or flywheels. The ECCE project, nowadays in a second phase\footnote{The first phase of the ECCE project is explained in Chapter 1} is developed in joint cooperation with the FEMTO-ST laboratory of the University of Franche-Comté and two industrial partners, HELION and PANHARD General Defense. It aims to study the implementation, control and energy management of different hybrid sources. As a research developed along the second phase of the ECCE project, the principal objective of this thesis is to design, to implement and to evaluate an energy management supervision system in the ECCE HEV. This thesis proposes an original energy management strategy based on expert knowledge and type-2 fuzzy logic. The design of the fuzzy logic controller is done by using knowledge engineering. This technique allows extracting knowledge from several experts using surveys. The consideration of type-2 fuzzy logic systems enables modelling the uncertainty in the answers of the experts. This thesis presents a second application of type-2 fuzzy logic: the voltage regulation of a DC/DC power converter. The principal motivation for developing this application is that it is easier to implement in laboratory at a relatively low cost and it permits a viability evaluation of type-2 fuzzy logic before an implementation in the ECCE mobile laboratory. This is useful because one of the main challenges of this thesis is to reduce the time to experimentally validate the energy management system. This is required to respect the time schedule constraints and to reduce the costs associated to gather the partners of the project at PANHARD locations in Saint-Germain Laval.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Energy management of a hybrid electric vehicle: an approach based on type-2 fuzzy logic

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Imagen de apoyo de  Self-FEXT Cancellation for use with VDSL2 transceivers: Design, implementation and verification of a tool for numerical performance evaluation

Self-FEXT Cancellation for use with VDSL2 transceivers: Design, implementation and verification of a tool for numerical performance evaluation

Por: Daniel Hincapie Henao | Fecha: 2014

Vectoring is a novel technology created to expand the capacity boundaries of Veryhigh- bit-rate DSL 2 (VDSL2) systems. It mitigates the reduction of data rate and reach in VDSL2 systems caused by the crosstalk interference that appears when multiple services share the telephone network’s infrastructure. However, the implementation of vectoring on real systems faces numerous challenges that limit its potential to enhance the data rate and reach of VDSL2 systems. Therefore, evaluating its performance in close-to-real scenarios considering different technological aspects has turned into an interesting field of research that also helps in the development of new and faster technologies. This thesis evaluates quantitatively the performance of vectoring on VDSL2 systems. It proposes the extension and parametrization of performance indicators to compare and measure the impact of six different aspects on vectoring systems: network topology, binder occupancy, background noise, channel estimation errors, complexity constraints, and precoding and canceling schemes. Their evaluation requires numerical results that are obtained through a simulation tool, which is designed and implemented as part of this thesis. The obtained results and the conducted analyses give concluding guidelines for the vectoring technology and can be taken into account by manufactures and service providers for the deployment of real systems. In addition, and as a result of the objective of providing an accurate evaluation that represents well the real systems’ performance, this thesis contributes with the statistical characterization of the Far-end Crosstalk (FEXT) in a 50-pair cable binder commonly used in Germany (DTAG-40) and constructs its stochastic model. The model and the results are verified through real systems measurements, reference documents of the Broadband Forum and existing literature. Thus, the simulation tool and the characterized channel model constitute a contribution for the evaluation of DSL systems that can be used in future works.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Self-FEXT Cancellation for use with VDSL2 transceivers: Design, implementation and verification of a tool for numerical performance evaluation

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Imagen de apoyo de  Network selection games: simulation tool development and performance evaluation = Selección de redes mediante juegos: desarrollo de herramienta de simulación y evaluación de rendimiento

Network selection games: simulation tool development and performance evaluation = Selección de redes mediante juegos: desarrollo de herramienta de simulación y evaluación de rendimiento

Por: Camilo Javier Pineda Sopó | Fecha: 2010

The present thesis work is motivated in the recent developments of wireless access technologies, which have given noticeable changes on both operator and end-user side. From the operator side, the wireless access networks have evolved from 1st generation technologies (1G) up to 3rd generation technologies (3G) during the last three decades. Additionally, 4th generation networks (4G) based in advanced radio technologies are already in development phases. The proliferation of wireless access networks yields opportunities to the end-user, however it can also induce a additional problematic due to the complexity of the network to be operated. Therefore, the end-user has the possibility to choose dynamically which access technology (access network) to connect to, in order to obtain the required service. From the moment the decisions from the users occur in a distributed, non-coordinated and generally opportunistic way, the access to wireless networks process dynamics are in a need to be studied. The present thesis work, analyses the competitive access problem by means of game theory. In particular, non-cooperative game models in which the users tend to maximize their individual utility from the access problem are considered. The thesis work presents the development and implementation of a software instrument capable of simulating game dynamics individualizing equilibria conditions and measuring the transition length to reach such equilibria (convergence time). The second part of the thesis work includes the analysis of different realistic wireless access networks considering different access strategies which are selected by the end-users and different utility function formulations with which the players “play” the game.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Network selection games: simulation tool development and performance evaluation = Selección de redes mediante juegos: desarrollo de herramienta de simulación y evaluación de rendimiento

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Imagen de apoyo de  Electrónica básica para ingenieros

Electrónica básica para ingenieros

Por: Gustavo Adolfo Ruiz Robredo | Fecha: 2020

El objetivo de esta publicación es proporcionar una herramienta de ayuda didáctica que permita adquirir los conocimientos básicos de electrónica necesarios en los estudios de Ingeniería. Desde el punto de vista académico, este texto ha sido dotado de una estructura y organización adecuada para lograr una fácil comprensión de la materia de forma lógica y ordenada. Su fuerte componente práctica constituye una base idónea para abordar una futura especialización en cualquiera de los campos de la Electrónica. Esta obra está destinada a aquellas personas que, teniendo unos conocimientos previos de las...
Fuente: Digitalia Formatos de contenido: Libros
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Imagen de apoyo de  Online video stabilization for UAV. Motion estimation and compensation for unnamed aerial vehicles

Online video stabilization for UAV. Motion estimation and compensation for unnamed aerial vehicles

Por: Rodrigo José Ortiz Cayón | Fecha: 2013

Unnamed Aerial Vehicles (UAV) are known for their application in surveillance and tracking with on-board cameras. Videos from UAV usually suffer from jitter and high frequency unintended movements which makes necessary stabilize the footage. This is a Computer Vision problem, particularly difficult due to level of noise in acquisition and different types of scenarios which make hard to implement online stabilizer (on the fly). The present thesis explains in depth algorithms, methods and implementations of the OpenCV module videostab. We presented a version in C++ of videostab in context of video from UAV. Two main blocks constitute the current implementation: motion estimation and motion stabilization. In the former, the system robustly estimates global displacement in between every consecutive pair of frames. The latter can be used in two possible ways: Assuming that estimated motion contains intended UAV motion and high frequency vibrations or assuming that all estimated motion is undesirable. The first case is solved with a Gaussian filter to smooth motions and, in the second case, a filter called Zero Motion was implemented to give sensation of stillness. Results show that the implementation is robust and can work in different scenarios of UAV. Moreover, it is possible to run it in a general purpose computer with high speed performance. Online performance can be achieved using some function with graphic processing unit (GPU).
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Online video stabilization for UAV. Motion estimation and compensation for unnamed aerial vehicles

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Imagen de apoyo de  Brain-machine interface for decoding imaginary limb movements = Interface cerebro computador para la decodificación de movimientos imaginarios

Brain-machine interface for decoding imaginary limb movements = Interface cerebro computador para la decodificación de movimientos imaginarios

Por: Anderson Mora Cortés | Fecha: 2009

In this thesis two different studies are presented separately because each study has a different purpose even though the two studies are complementary. For the first study an available dataset for BCI is used. This dataset is consistent with the aim of the first study because it allows the implementation and development of the proposed technique for BCI based on imaginary limb movement with a small amount of electrodes. The technique I implemented trough this study is a reliable option to be used for a BCI-based on imaginary movements. In the second study a different dataset is used because the requirements for the technique to be implemented are different. Training and testing dataset are necessary to describe a practical computational technique that is applied for a single trial classification based on a Common Spatial Pattern and complemented with a linear discriminator. The training data is used to build a classifier and the testing data allows measuring the performance of the classifier implemented. After testing the classifier the good performance obtained makes this technique of great interest for any imaginary movement based-BCI.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Brain-machine interface for decoding imaginary limb movements = Interface cerebro computador para la decodificación de movimientos imaginarios

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Imagen de apoyo de  Information systems development methodologies for Data-driven Decision Support Systems = Metodologías de desarrollo de software para los sistemas de información de apoyo a la toma de decisiones basados en datos

Information systems development methodologies for Data-driven Decision Support Systems = Metodologías de desarrollo de software para los sistemas de información de apoyo a la toma de decisiones basados en datos

Por: Juan Manuel Muñoz Palacio | Fecha: 2010

The sum of small and big decisions made in all levels of companies determines its performance. Also, the quality of the decisions can be improved when there is information available to help decision makers in their task. All this has motivated the development of specific types of information systems aimed to provide the information necessary in the different levels of the company to support structured and semi-structured decision making. This research will be focused on a specific group of information systems to support decisions that make intensive use of historic data integrated from multiple sources; Data-driven Decision Support Systems (DDSS). On the other hand the features of the systems to support decisions together with tasks and techniques that are unique for these systems demanded the creation of specific development methodologies to perform the development process. In response to that demand, several proposals have been elaborated but there is no consensus in the field. Currently there is a debate around two development methodologies that are analysed on this paper. After the analysis of the proposed methodologies a case study organization with experience on the development of DDSS will be analysed. The research aims to understand and present the development process carried out in the organization to develop DDSS. In the analysis the influence of the existing methodologies and other sources, like traditional development methodologies and standardization is included. Finally a proposal to improve the development of DDSS in the case study organization is presented. The proposal is generated in the light of the existing methodologies and other particular proposals that deal with single tasks on the development process.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Tesis
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Information systems development methodologies for Data-driven Decision Support Systems = Metodologías de desarrollo de software para los sistemas de información de apoyo a la toma de decisiones basados en datos

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Imagen de apoyo de  Casas para obreros o económicas

Casas para obreros o económicas

Por: D. J. A. Rebolledo | Fecha: 1872

Estudio y análisis sobre el diseño que deben tener las casas de los obrerros en España. El texto está dividido en tres partes, en la primera de ella, se discuten sobre las condiciones técnicas e higiénicas que deben contar las viviendas. En la segunda, se hace un estudio comparativo de las casas obreras en otros países y, finalmente, la última parte se destina a la aplicación de datos y reglas precedentes al caso de España.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Libros
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Imagen de apoyo de  Dibujo técnico con gráficas de ingeniería /

Dibujo técnico con gráficas de ingeniería /

Por: Frederick E. Giesecke | Fecha: 2018

Por muchas décadas, este texto, Dibujo técnico con gráficas de ingeniería, ha sido reconocido como una autoridad en las teorías y técnicas de la comunicación gráfica. Generaciones de profesores y estudiantes han utilizado y conservado este libro como una referencia profesional. Su éxito constante puede atribuirse a una explicación clara y atractiva de los principios y a sus dibujos, que aún no han sido superados en cuanto a detalle y precisión.
Fuente: E-books 7-24 Formatos de contenido: Libros
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Imagen de apoyo de  Modeling and measurement of a pedestrian's center-of-mass trajectory

Modeling and measurement of a pedestrian's center-of-mass trajectory

Por: Albert Ricardo; Blachowski Ortiz Lasprilla | Fecha: 2017

This paper presents the measurement and model updating of a pedestrian's center of mass trajectory. A mathematical model proposed by the authors is updated using the actual trajectory of a pedestrian. The mathematical model is based on the principle that a human's control capability tries to maintain balance with respect to the pedestrian's center of mass (CoM), independently of the surface type. In this research, the human is considered as a mass point concentrated at CoM. The parameters of the models are updated using experimental identification of the human walking trajectory on a rigid surface. The proposed measurement technique applies infrared emitter and a depth sensor, which enable skeletal tracking of the pedestrian walking on rigid or flexible structures. Experiments were performed using a mobile platform with the time-of-flight commercial camera Microsoft Kinect for Windows 2.0. The velocity of the mobile platform is set to maintain a one meter separation from the pedestrian in order to provide high resolution. The results allow identification of the human's trajectory and its relation to the walking surface's behavior.
Fuente: Biblioteca Virtual Banco de la República Formatos de contenido: Artículos
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Modeling and measurement of a pedestrian's center-of-mass trajectory

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