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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
101

Bidirectional LSTM-CNNs-CRF Models for POS Tagging

Tang, Hao January 2018 (has links)
In order to achieve state-of-the-art performance for part-of-speech(POS) tagging, the traditional systems require a significant amount of hand-crafted features and data pre-processing. In this thesis, we present a discriminative word embedding, character embedding and byte pair encoding (BPE) hybrid neural network architecture to implement a true end-to-end system without feature engineering and data pre-processing. The neural network architecture is a combination of bidirectional LSTM, CNNs, and CRF, which can achieve a state-of-the-art performance for a wide range of sequence labeling tasks. We evaluate our model on Universal Dependencies (UD) dataset for English, Spanish, and German POS tagging. It outperforms other models with 95.1%, 98.15%, and 93.43% accuracy on testing datasets respectively. Moreover, the largest improvements of our model appear on out-of-vocabulary corpora for Spanish and German. According to statistical significance testing, the improvements of English on testing and out-of-vocabulary corpora are not statistically significant. However, the improvements of the other more morphological languages are statistically significant on their corresponding corpora.
102

Mecanismos de transferência de carga em estacas escavadas em solos arenosos através de provas de carga instrumentadas

Sestrem, Liamara Paglia January 2018 (has links)
A experiência acumulada quanto à análise do comportamento de fundações, em relação aos diversos perfis de solos, vem confirmando a necessidade de realizar ensaios em verdadeira grandeza para avaliação de desempenho desses elementos. Aplicação de metodologias empíricas e semi-empíricas, limitadas à prática construtiva regional e às condições específicas que contemplaram o seu estabelecimento, resultam em incertezas nos métodos de previsão e dispersão entre valores de capacidade de carga medidos e previstos. Com base nessas evidências, os ensaios de prova de carga representam a técnica mais comumente empregada para previsão e avaliação da capacidade de suporte em estacas. Como resultado, obtém-se uma curva carga versus deslocamento a partir de um carregamento estático no topo do elemento. Quando executadas em estacas instrumentadas ao longo do fuste, permitem avaliar a mobilização (transferência) de resistências (cargas) ao longo da profundidade e dos carregamentos. Alternativamente, o uso de células expansivas bidirecionais, comumente denominadas de “O-cell”, vem crescendo em nível internacional e confirmando seu potencial de aplicação, embasado por vantagens que incluem a ausência de um sistema de reação e a obtenção de forma direta da resistência de ponta e atrito lateral durante os carregamentos. No intuito de contribuir para uma melhor compreensão dos mecanismos de transferência de carga envolvidos em ensaios estáticos, o presente estudo comparou resultados dessas duas metodologias através de três de ensaios estáticos convencionais e um bidirecional realizados em duas estacas escavadas de grande diâmetro em areia. A distribuição dos carregamentos medidos em função do deslocamento em termos de carga total e de atrito lateral ao longo desses quatro ensaios caracterizou-se por resultados similares. Pequenas diferenças foram observadas entre o ensaio de topo e bidirecional executados em um mesmo elemento de fundação e estão possivelmente associadas aos diferentes níveis de deformação obtidos com as duas técnicas. As condições de limpeza e integridade da ponta em estacas moldadas in loco estão associadas a incertezas ainda que os procedimentos usuais de controle e limpeza tenham sido executados. Divergências entre a parcela de contribuição de ponta ao longo dos ensaios avaliados podem estar associadas a esses fatores e a pequenas variações da geometria descritas em detalhes no trabalho. Deformações medidas pelos strain gages instalados ao longo do fuste da estaca permitiram avançar no entendimento dos mecanismos de transferência de carga existentes durante os carregamentos impostos. Os resultados indicam que o atrito começa a ser mobilizado desde os primeiros incrementos de carga e permanece se desenvolvendo com o aumento das deformações que não são constantes ao longo da profundidade. O comportamento medido ao longo do fuste varia em função do nível de confinamento e ainda da densidade relativa do solo subjacente. Os resultados permitem concluir também que ainda que existam esforços residuais atuantes, sua ordem de grandeza não reflete mudanças importantes no comportamento de elementos de fundação moldados in loco. / The gained experience in foundations behavior analysis on different soil profiles confirms the need to perform tests on full-scale elements to evaluate pile performance. Application of empirical and semi-empirical methodologies, limited to the regional constructive practice and the specific conditions that led to its establishment, result in uncertainties in the prediction and dispersion methods between measured and predicted load capacity values. Based on these evidences, the load tests represent the most commonly used technique for predicting and evaluating pile capacity. As a result, a load versus displacement curve is obtained from a static load at the top of the element. When carried out in piles instrumented along the shaft, it is possible to evaluate the mobilization (transfer) of resistances (loads) along the depth and the loads. Alternatively, the use of bidirectional expansive cells, commonly referred to as "O-cell", has been growing internationally, which confirms its potential, based on advantages that include the absence of a reaction system and obtaining the toe resistance and lateral friction directly during loading. In order to contribute to a better understanding of the load transfer mechanisms involved in static loading tests, the present study compared the results of these two methodologies through three conventional and one bidirectional load tests carried out on two large diameter bored piles. The distribution of loadings measured as a function of the displacement in terms of total load and lateral friction over these four tests was characterized by similar results. Small differences were observed between conventional top-down and bidirectional tests performed on the same foundation member and are possibly associated with the different deformation levels obtained with the two techniques. Cleaning conditions and pile toe integrity in bored piles are associated with uncertainties even though the usual control and cleaning procedures have been performed. Divergences between the contributions of the pile toe resistance along the evaluated tests may be associated with these factors and small variations of the geometry. Deformations measured by the strain gages installed along the pile shaft allowed improving the understanding of the load transfer mechanisms during the loading procedures. The results indicate that shaft friction begins to be mobilized since the first load increments and continues to increase with the strains, which are not linear along the pile shaft. The behavior measured along the shaft is a function of vertical effective stress and relative density. The results also show that although there are active residual stresses, their magnitude does not reflect important changes in the behavior of bored piles.
103

Seleção genética da exploração dos braços abertos por ratos albinos e seu efeito na emocionalidade e aprendizagem / Genetic selection of an elevated plus-maze open arms by albino rats and its effect in emotion and learning.

Thiago Marques de Brito 30 January 2015 (has links)
A seleção genética de comportamentos relacionados a um componente emocional do tipo ansiedade, associada ao estudo das possíveis influências desse traço sobre outros componentes emocionais como o medo, impulsividade e tarefas de aprendizagem aversiva, podem contribuir para o entendimento da ansiedade, bem como, fornecer uma base sólida para investigações neurofisiológicas, bioquímicas e moleculares da mesma. Assim, o presente trabalho selecionou duas linhagens de ratos da linhagem Wistar: uma com característica de alta exploração dos braços abertos do labirinto em cruz-elevado (Filô-HE) e outra com baixa exploração desses braços (Filô-LE), e comparou os efeitos da seleção dessas duas linhagens sobre comportamentos associados à ansiedade, medo, impulsividade e aprendizagem aversiva. Para isso, um lote de animais fornecidos pelo Biotério Central da USP-RP foram distribuídos em dois grupos distintos: (1) os que apresentavam maior exploração dos braços abertos do Labirinto em Cruz Elevado (LCE) - (Filô-HE) e (2) os com menor exploração desses braços (Filô-LE) ao longo de doze gerações (de S1 a S12, sem contar o grupo inicial do qual derivam as gerações). Na sexta, nona e décima segunda gerações, os animais foram submetidos aos seguintes testes comportamentais: LCE, Campo Aberto (somente na décima segunda), esquiva passiva, labirinto aquático de Morris (somente na décima segunda), sobressalto (que avalia a resposta de medo), e gradiente de aversão elevado (desenvolvido em nosso laboratório para medir impulsividade). Os dados indicaram a seleção de duas linhagens de ratos Wistar com características distintas para a exploração dos braços abertos do LCE. De um lado, foi selecionada a linhagem Filô-HE, que possui como principal característica, altos índices de exploração de ambientes que geralmente são evitados por outros animais. De outro, foi selecionada (até a oitava geração), a linhagem Filô-LE, que explorava muito pouco ambientes potencialmente aversivos. Tais resultados podem ser interpretados, respectivamente, como (a) baixa e alta frequência de comportamentos associados à ansiedade e medo, (b) baixa e alta frequência de comportamentos associados à impulsividade, (c) altos e baixos níveis de dificuldade na aprendizagem relacionada a memórias emocionais, ou (d) até mesmo o efeito conjunto de todas essas características comportamentais. Porém, para um conhecimento mais confiável, é necessário que os estudos supracitados passem a explorar aspectos neurofisiológicos, psicofarmacológicos, bioquímicos e genéticos, ampliando a investigação dos componentes emocionais selecionados. Bem como, promovendo um controle mais rígido dos traços selecionados e de suas relações com outros componentes que possam interferir na seleção / The genetic selection of behaviors related to an anxiety-like emotional component, associated to the study of the possible influences of this trait over other emotional components like fear, impulsivity and aversive learning, can contribute to the understanding of anxiety as well as supply a solid basis for its neurophysiological, biochemical and molecular investigation. Thus, the present work selected two strains of Wistar rats: one characterized by a high exploration of the open arms of an elevated plus-maze (Filô-HE) and another with a low exploration of these arms (Filô-LE), and compared the effects of such a selection on behaviors associated with anxiety, fear, impulsivity and aversive learning. For this, a batch of animals supplied by the animal house of the USP at Ribeirão Preto were distributed into two distinct groups: (1) one presenting more exploration of the open arms of an elevated plus-maze (EPM) Filô-HE and (2) one with less open arm exploration Filô-LE along twelve generations (from S1 to S12, not counting the initial group from which all generations derived). On the sixth, ninth and twelfth generations the animals were submitted to the following behavioral tests: LCE, open-field (only in the twelfth generation), passive avoidance, Morris aquatic maze (only in the twelfth generation), startle (which evaluates a fear response), and elevated aversion gradient (developed in our laboratory to measure impulsivity). The data indicated a selection of two Wistar rats strains with distinct characteristics concerning the exploration of the open arms of and EPM. On the one hand, the strain Filô-HE was selected exhibiting as the main characteristic high measures of exploration of environments which are usually avoided by other animals. On the other hand, the strain Filô-LE was selected (up to the eighth generation) exhibiting very little exploration of potentially dangerous environments. These results may be interpreted as, respectively, (a) low and high frequency of behaviors associated to anxiety and fear, (b) low and high frequency of behaviors associated to impulsivity, (c) high and low levels of difficulty in learning related to emotional memories, or (d) even the joint effect of all these behavioral characteristics. However, for a more reliable knowledge it is necessary that the studies above begin to explore neurophysiological, psychopharmacological, biochemical and genetic aspects, broadening the investigation ot hte selected emotional components, as well as promoting a more strict control of the selected traits and of its relations with other components that may interfere in the selection
104

An Evaluation of Shortest Path Algorithms on Real Metropolitan Area Networks

Johansson, David January 2008 (has links)
This thesis examines some of the best known algorithms for solving the shortest point-to-point path problem, and evaluates their performance on real metropolitan area networks. The focus has mainly been on Dijkstra‟s algorithm and different variations of it, and the algorithms have been implemented in C# for the practical tests. The size of the networks used in this study varied between 358 and 2464 nodes, and both running time and representative operation counts were measured. The results show that many different factors besides the network size affect the running time of an algorithm, such as arc-to-node ratio, path length and network structure. The queue implementation of Dijkstra‟s algorithm showed the worst performance and suffered heavily when the problem size increased. Two techniques for increasing the performance were examined: optimizing the management of labelled nodes and reducing the search space. A bidirectional Dijkstra‟s algorithm using a binary heap to store temporarily labelled nodes combines both of these techniques, and it was the algorithm that performed best of all the tested algorithms in the practical tests. This project was initiated by Netadmin Systems i Sverige AB who needed a new path finding module for their network management system NETadmin. While this study is primarily of interest for researchers dealing with path finding problems in computer networks, it may also be useful in evaluations of path finding algorithms for road networks since the two networks share some common characteristics.
105

Single phase bidirectional DAB DC-DC converter based on three state switching cell / Conversor CC-CC bidirecional DAB monofÃsico baseado na cÃlula de comutaÃÃo de trÃs estados

Luan Carlos dos Santos Mazza 15 December 2014 (has links)
This work presented is DC-DC isolated ZVS Bidirectional Dual Active Bridge (DAB) single phase converter, based three-state switching cell is presented. The proposal is to apply it in photovoltaic systems with battery bank into smart networks. Basically the drive control is the duty cycle (D) of the switches and the Phase Shift (φ) of the fundamental tensions between the bridges. The gyrator modeling of the converter is presented, highlighting its natural operating characteristic as gyrator. Shows the qualitative and quantitative analysis of the converter, realizing the full study of the stages of operation of the topology and checking all sixteen regions of operation. To obtain the regions of soft-switching, the fundamental model is applied. The design procedure of the converter is presented, and the results of simulations. A 2kW prototype was developed, aimed at obtaining experimental results validate the theoretical analysis / Neste trabalho à apresentado o conversor CC-CC ZVS isolado bidirecional Dual Active Bridge (DAB) monofÃsico, baseado na cÃlula de comutaÃÃo de trÃs estados. A proposta à aplicÃ-lo em sistemas fotovoltaicos com banco de baterias em redes inteligentes. Basicamente o controle do conversor consiste na razÃo cÃclica (D) dos interruptores e o Phase Shift (φ) entre as componentes fundamentais das tensÃes entre as pontes. A modelagem por gyrator do conversor à apresentada, destacando-se sua caracterÃstica natural de funcionamento como gyrator. Mostra-se a anÃlise qualitativa e quantitativa do conversor, realizando o estudo completo das etapas de operaÃÃo da topologia e verificando todas as dezesseis regiÃes de operaÃÃo. Para obtenÃÃo das regiÃes de comutaÃÃo suave, à aplicado o modelo fundamental. O procedimento de projeto do conversor à apresentado, alÃm dos resultados de simulaÃÃes. Um protÃtipo de 2 kW foi desenvolvido, visando a obtenÃÃo dos resultados experimentais e validando a anÃlise teÃrica.
106

Desenvolvimento conceitual, projeto, construção e testes de um barco bidirecional sem leme movido por kite

LUNDGREN, Edwin Althor Jürgen Nieling 24 July 2015 (has links)
Submitted by Haroudo Xavier Filho (haroudo.xavierfo@ufpe.br) on 2016-03-17T18:54:32Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese de Doutorado em Engenharia Mecânica - Edwin Lundgren - Recife 2015.pdf: 6647333 bytes, checksum: 562061d27a257684cbc87a9f44cca7a8 (MD5) / Made available in DSpace on 2016-03-17T18:54:32Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese de Doutorado em Engenharia Mecânica - Edwin Lundgren - Recife 2015.pdf: 6647333 bytes, checksum: 562061d27a257684cbc87a9f44cca7a8 (MD5) Previous issue date: 2015-07-24 / O presente trabalho apresenta como tema central o desenvolvimento e a realização de um conceito tecnológico inovador para propulsionar embarcações utilizando a força do vento por meio de uma pipa dirigível de alto desempenho aerodinâmico conhecida como Kite. Para demonstrar a eficiência da tecnologia aplicada é projetado, manufaturado e testado um barco protótipo com quatro metros de comprimento capaz de carregar uma ou duas pessoas. Kites modernos são projetados para operar em regime de sustentação aerodinâmica e podem ser movimentados de forma razoavelmente controlada em uma região denominada “janela de vento” e possibilitam a geração de forças perpendiculares á direção do vento. Assim, uma embarcação tracionada por Kites e equipada com uma quilha pode realizar cursos cruzados contra o vento. O equilíbrio hidrodinâmico da embarcação tratada neste trabalho é alcançado através de tecnologia com uso de uma plataforma giratória azimutal e um conjunto de mecanismos para o manuseio do Kite e o controle do rumo do barco. É apresentado o cálculo para relacionar o equilíbrio da embarcação com o voo do Kite. Não há necessidade de leme para controlar o rumo da embarcação, portanto o barco protótipo deste trabalho não apresenta algum leme. Os dados obtidos em teste foram relacionados, processados e os resultados quantitativos de percursos e manobras são apresentados e descritas as condições e posicionamentos das grandezas relevantes. A Propulsão do barco prototipo por meio de um Kite mostrou bons resultados em ventos acima de 18 km/h (10 nós). Nestas condições ficou comprovado a eficiência do sistema inovador para propulsionar e guiar barcos com Kites como o protótipo apresentado no presente trabalho. / This work has as its central theme the development and realization of an innovative technological concept of boat propulsion using the wind power through a steerable Kite. To demonstrate the effectiveness of the applied technology there is designed, manufactured and tested a prototype boat with four meters in length capable of carrying one or two people. Modern Kites are designed to operate in aerodynamic lift system. As a result, these devices can be moved in fairly controlled manner in a semi-spherical region called "wind window" and allow the generation of perpendicular forces to wind direction. Thus, a vessel pulled by a Kite and equipped with a good keel can perform crossed courses against the wind. The hydrodynamic balance of the vessel treated in this work is achieved through the use of a technology with azimuthal platform and a set of mechanisms for Kite handling and controlling the direction of the boat. A new method of calculation of the balance of the boat during the Kite flight is presented as well as some results of hydrodynamic simulations. Another advantage of the azimuth platform technology is the ability to control the direction of the boat only by the Kite control devices and the relative positioning of the azimuthal platform within the hull. There is no need of a rudder to control the direction of the boat, so the boat prototype of this work does not present any rudder. The test data were related, processed and quantitative results concerning courses and maneuvers are presented and the conditions and positions of the relevant magnitudes are described. The propulsion of the prototype boat by a Kite showed good results in winds over 18 km/h (10 knots). Under these conditions the efficiency of the innovative propulsion system for boats with Kites as the prototype presented in this work was testified. The innovative directional control allows the handling of the vessel at high upwind courses. The bidirectionality of the prototype boat increases the possibilities of executing maneuvers with reversal of the navigation direction and easy windward routes.
107

INVERSOR BIDIRECIONAL PARA CONTROLE DE FLUXO DE POTENCIA EM MINIRREDES COM GERACAO DISTRIBUIDA / BIDIRECTIONAL INVERTER FOR POWER FLUX CONTROL IN MICROGRIDS WITH DISTRIBUTED GENERATION

Silva, Felipe Simoes Freitas e 25 April 2014 (has links)
Made available in DSpace on 2016-08-17T14:53:28Z (GMT). No. of bitstreams: 1 Dissertacao Felipe Simoes Freitas e Silva.pdf: 5795737 bytes, checksum: dc589a2115d1b568db1a3c2b9de3f80c (MD5) Previous issue date: 2014-04-25 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / This work presents the study, modelling and assembling of a three-phase bidirectional DCAC converter suitable for operating as an interface between an energy storage system based on a battery bank and an isolated microgrid. The converter consists of two stages: a DC-DC stage implemented with a bidirectional half-bridge converter that operates on buck or boost mode (during charge or discharge of the ESS, respectively), and a DC-AC full-bridge three-phase bidirectional inverter. The two stages are connected through a DC link, which also works as a power-decoupling element. Isolation from the microgrid is obtained with a :-Y low frequency transformer. A control strategy is proposed where the DC-DC stage regulates the DC link voltage level while the DC-AC controls the three-phase output voltage and frequency, therefore acting as a grid-forming converter (GFC). A 15kW prototype was successfully built and tested in different situations. Simulation and experimental results are shown. / Esta dissertação apresenta o estudo, modelagem e montagem de um conversor bidirecional CC-CA trifásico de múltiplos estágios, projetado para operar como interface entre um sistema de armazenamento e uma minirrede isolada. O conversor consiste de dois estágios de conversão: um estágio de conversão CC-CC, implementado com um conversor buck-boost de meia ponte, que opera em modo buck ou boost (durante o carga ou descarga do sistema de armazenamento, respectivamente), e um estágio de conversão CC-CA composto por um conversor CC-CA trifásico. Os dois estágios são conectados por um elo CC, que funciona como um elemento de desacoplamento de potência. Isolação galvânica é obtida através de um transformador de baixa frequência. Uma estratégia de controle é utilizada na qual o estágio CC-CC controla a tensão do elo CC enquanto o estágio CC-CA controla a tensão e a frequência da minirrede, atuando, portanto, como um conversor formador de rede (CFR). Um protótipo foi montado e testado em diferentes situações. Resultados de simulação e de testes de bancada são mostrados.
108

Behavioural Studies and Computational Models Exploring Visual Properties that Lead to the First Floral Contact by Bumblebees

Orbán, Levente L. January 2014 (has links)
This dissertation explored the way in which bumblebees' visual system helps them discover their first flower. Previous studies found bees have unlearned preferences for parts of a flower, such as its colour and shape. The first study pitted two variables against each other: pattern type: sunburst or bull's eye, versus the location of the pattern: shapes appeared peripherally or centrally. We observed free-flying bees in a flight cage using Radio-Frequency Identification (RFID) tracking. The results show two distinct behavioural preferences: Pattern type predicts landing: bees prefer radial over concentric patterns, regardless of whether the radial pattern is on the perimeter or near the centre of the flower. Pattern location predicts exploration: bees were more likely to explore the inside of artificial flowers if the shapes were displayed near the centre of the flower, regardless of whether the pattern was radial or concentric. As part of the second component, we implemented a mathematical model aimed at explaining how bees come to prefer radial patterns, leafy backgrounds and symmetry. The model was based on unsupervised neural networks used to describe cognitive mechanisms. The results captured with the results of multiple behavioural experiments. The model suggests that bees choose computationally "cheaper" stimuli, those that contain less information. The third study tested the computational load hypothesis generated by the artificial neural networks. Visual properties of symmetry, and spatial frequency were tested. Studying free-flying bees in a flight cage using motion-sensitive video recordings, we found that bees preferred 4-axis symmetrical patterns in both low and high frequency displays.
109

Aditivní dvojice v kvantitativní teorii typů / Additive Pairs in Quantitative Type Theory

Svoboda, Tomáš January 2021 (has links)
Both dependent types and linear types have their desirable properties. Department types can express functional dependencies of inputs and outputs, while linear types offer control over the use of computational resources. Combining these two systems have been difficult because of their different interpretations of context presence of variables. Quantitative Type Theory (QTT) combines dependent types and linear types by using a semiring to track the kind of use of every resource. We extend QTT with the additive pair and additive unit types, express the complete QTT rules in bidirectional form, and then present our interpreter of a simple language based on QTT. 1
110

Elaboración de una biblioteca de comunicación en tiempo real entre dispositivos Smart TV LG WebOS y Android para el desarrollo de un videojuego retro / Implementation of a real time communication library between smart tv devices and Android devices based on WebSocket for the development of applications

Gabriel Caycho, Gian Franco Michael, Blas Perez, Miguel Angel 25 November 2020 (has links)
La industria de los dispositivos inteligentes ha crecido en los últimos años, por lo que una gran mayoría de personas cuentan con un Smart TV y al menos un teléfono inteligente en sus hogares. La transformación de la era digital busca mejorar la experiencia del usuario y facilitar el uso de diferentes dispositivos inteligentes. Sin embargo, su uso interactivo en conjunto no se ha explotado en su totalidad, debido a que no se cuenta con una herramienta que facilite esta labor. El presente documento validará la propuesta de crear una biblioteca de comunicación que permite conectar múltiples dispositivos Android con un Smart TV LG WebOS y de esta manera promover el desarrollo de aplicaciones para los Smart TV, evitando una implementación desde cero y agilizando el despliegue de nuevas aplicaciones que generen un gran valor para los usuarios. La validación del proyecto se realizará mediante la aplicación de una metodología de investigación que permitirá el inicio y desarrollo posterior del proyecto. / The smart device industry has grown in recent years, so a vast majority of people have a Smart TV and at least one smartphone in their homes. The transformation of the digital age seeks to improve the user experience and facilitate the use of different smart devices. However, its interactive use as a whole has not been fully exploited, because there is no tool to facilitate this work. This document will validate the proposal to create a communication library that allows multiple Android devices to be connected to an LG WebOS Smart TV and in this way promote the development of applications for Smart TVs, avoiding a deployment from scratch and speeding up the deployment of new applications. that generate great value for users. The validation of the project will be carried out by applying a research methodology that will allow the start and subsequent development of the project. / Trabajo de investigación

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