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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.
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Showing 351 to 360 of 364 (0.033 seconds)| 351 |
[en] SIMULATION AND PERFORMANCE OF INTEGRATED DATA AND SPEECH SERVICE IN CELULAR SISTEMS USING GSM/HSCSD / [pt] SIMULAÇÃO E DESEMPENHO DE SERVIÇO INTEGRADO DE VOZ E DADOS EM SISTEMAS CELULARES UTILIZANDO O PADRÃO GSM/HSCSDTALLES ALEXANDRE CAMILO 16 May 2003 (has links)
[pt] Com o crescimento da utilização das redes celulares para a
transmissão de dados, as operadoras de telefonia móvel
estão enfrentando um aumento dramático na utilização do
recurso rádio para suprir esta nova necessidade. Com isto,
estão sendo obrigadas a migrarem para novas tecnologias que
propiciem uma alta eficiência espectral, permitindo assim
uma melhor utilização do espectro disponível.
Este trabalho descreve uma ferramenta de simulação
desenvolvida para analisar o gerenciamento dos recursos de
rádio, além de propor um novo algoritmo de alocação de
canais de dados para sistemas móveis pessoais, permitindo a
transmissão de voz e dados sobre a mesma interface aérea.
É sabido que é extremamente difícil levar em conta todos os
parâmetros que devem ser considerados em um sistema móvel
real. Procurou-se então adotar os mais conhecidos modelos
de propagação, de mobilidade e de tráfego de voz e de dados
disponíveis na literatura, de forma a tentar aproximar a
ferramenta de simulação o máximo possível do caso real.
A contribuição deste trabalho é oferecer uma ferramenta de
simulação para as redes GSM/HSCSD que permita a otimização
da eficiência no uso do espectro disponível para
transmissão. Esta ferramenta possibilita ao usuário, além de
analisar a capacidade do sistema, o controle de potência e
estratégias de handover, avaliar novos algoritmos de
alocação de canal para o tráfego de voz e dados em
conjunto.
Ao final desta dissertação serão apresentados os resultados
obtidos com a utilização de um novo algoritmo de alocação
de canais para o tráfego de dados, além de realizar algumas
outras simulações buscando maximizar a eficiência espectral
do sistema utilizando deste novo algoritmo. / [en] Due to the increasing use of cellular networks for data
transmission, mobile telephone operators are facing a
dramatic raise in using radio resources to supply their
demand. As a result, they are being forced to migrate to new
technologies that provide high spectral efficiency,
allowing an optimized use of available spectrum.
This work describes the development of an advanced tool to
analyze the operator management of radio transmission for
personal mobile systems. The model was built considering
well-known propagation, mobility, voice and data traffic
for transmission assumptions, in order to approximate the
developed tool to the real world mobile systems.
The simulation tool is suited for GSM/HSCSD networks
allowing engineers to optimize the efficient use of the
available spectrum. It also permits the evaluation of
system capacity as well as the analysis of power control and
handover strategies. Another application exploited in this
work is the investigation of resource allocation algorithms.
A new algorithm for resource allocation in integrated voice
and data environments was proposed and its performance was
evaluated using the simulation tool.
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Monitorovací systém vodních toků s GSM komunikací / River mionitoring system with GSM communicationPačinek, David January 2014 (has links)
This master thesis is dedicated to system of water monitoring for use of alternative source power supply and GSM communication. The thesis carried out research on the possibilities to take measurements on watercourses, also detailed research of photovoltaic panel, available accumulators and their charging and a synopsis of similar systems. Furthermore, the master thesis also captures design and implementation datalogger device type with possibility to send measured data to the website.
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Návrh a analýza systémů pokročilého zabezpečení a střežení objektů a prostor / Design and Analysis of Systems for Advanced Guarding and Securing Objects and AreasKomínek, Petr January 2011 (has links)
This diploma thesis deals with design, realization and analysis of security and surveillance systems for buildings and spaces containing advanced components. One of the main design's parts is dedicated to intruder alarm system, access system, attendance and CCTV systems with the possibility of automatic motion tracking. Controlling and monitoring of particular subsystems is possible both locally and remotely from a computer via a web interface or by means of a software. The access to camera system from a mobile phone is also possible. IAS/ACS systems also enable controlling and transferring information about their state via SMS. The designed system was realized completely and its operating was demonstrated. The realization is described in detail including illustration of configuration of particular components. A security analysis and a possible future development of the project is summarized in the conclusion.
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HANDSFREE-ENHET FÖR MOBIL TRYGGHETSTELEFON / HANDS-FREE UNIT FOR SAFETY MOBILE TELEPHONESundberg, Daniel January 2009 (has links)
<p>Cnior Mobile AB i Lindesberg utvecklar en mobil trygghetstelefon för äldre. Detta examensarbete går ut på att utforma en handsfree-enhet för denna. Handsfree-enheten ska integreras i larmknappen, som bärs av användaren runt handleden, och har kontakt med telefonen via blåtandsradio. I examensarbetet ingår att välja ut lämplig högtalare och mikrofon, hitta lösningar för smuts- och vattentålighet samt att lösa problem med ekon och bakgrundsstörningar.</p><p>En högtalare hittades som uppfyllde kraven för smuts- och vattentålighet samtidigt som den hade utmärkt frekvensgång för återgivning av tydligt tal. Vattenavrinning från högtalaren löstes genom att ett sinussvep sänds ut från högtalaren varje gång ett samtal ska kopplas upp. På så sätt pressar ljudtrycket ut vattnet från handledsknappens kavitet. Olika utformningar av ljudhålen i handledsknappens skal provades. Den bästa lösningen för vattenavrinningen var att använda sju stycken runda hål med 1,3 mm i diameter. En ljudtrycksmätning säkerställde att ljudtrycket inte blev lidande av denna utformning av ljudhålen.</p><p>Ekosläckning och bakgrundsstörningsundertryckning sköts av GSM-modulen i trygghetsmobilen. I ekosläckningens manual finns beskrivet hur ekosläckningens 24 parametrar kan justeras för att passa olika applikationer. Endast en mindre ändring av de rekommenderade parametervärdena behövdes för att ekosläckning och bakgrundsstörningsundertryckning skulle fungera tillfredställande.</p><p>Eftersom mikrofonernas datablad visade på så snarlika egenskaper överlämnades mikrofonvalet till företaget, då det kan vara klokt att låta priset avgöra.</p>
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HANDSFREE-ENHET FÖR MOBIL TRYGGHETSTELEFON / HANDS-FREE UNIT FOR SAFETY MOBILE TELEPHONESundberg, Daniel January 2009 (has links)
Cnior Mobile AB i Lindesberg utvecklar en mobil trygghetstelefon för äldre. Detta examensarbete går ut på att utforma en handsfree-enhet för denna. Handsfree-enheten ska integreras i larmknappen, som bärs av användaren runt handleden, och har kontakt med telefonen via blåtandsradio. I examensarbetet ingår att välja ut lämplig högtalare och mikrofon, hitta lösningar för smuts- och vattentålighet samt att lösa problem med ekon och bakgrundsstörningar. En högtalare hittades som uppfyllde kraven för smuts- och vattentålighet samtidigt som den hade utmärkt frekvensgång för återgivning av tydligt tal. Vattenavrinning från högtalaren löstes genom att ett sinussvep sänds ut från högtalaren varje gång ett samtal ska kopplas upp. På så sätt pressar ljudtrycket ut vattnet från handledsknappens kavitet. Olika utformningar av ljudhålen i handledsknappens skal provades. Den bästa lösningen för vattenavrinningen var att använda sju stycken runda hål med 1,3 mm i diameter. En ljudtrycksmätning säkerställde att ljudtrycket inte blev lidande av denna utformning av ljudhålen. Ekosläckning och bakgrundsstörningsundertryckning sköts av GSM-modulen i trygghetsmobilen. I ekosläckningens manual finns beskrivet hur ekosläckningens 24 parametrar kan justeras för att passa olika applikationer. Endast en mindre ändring av de rekommenderade parametervärdena behövdes för att ekosläckning och bakgrundsstörningsundertryckning skulle fungera tillfredställande. Eftersom mikrofonernas datablad visade på så snarlika egenskaper överlämnades mikrofonvalet till företaget, då det kan vara klokt att låta priset avgöra.
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On Enhancement and Quality Assessment of Audio and Video in Communication SystemsRossholm, Andreas January 2014 (has links)
The use of audio and video communication has increased exponentially over the last decade and has gone from speech over GSM to HD resolution video conference between continents on mobile devices. As the use becomes more widespread the interest in delivering high quality media increases even on devices with limited resources. This includes both development and enhancement of the communication chain but also the topic of objective measurements of the perceived quality. The focus of this thesis work has been to perform enhancement within speech encoding and video decoding, to measure influence factors of audio and video performance, and to build methods to predict the perceived video quality. The audio enhancement part of this thesis addresses the well known problem in the GSM system with an interfering signal generated by the switching nature of TDMA cellular telephony. Two different solutions are given to suppress such interference internally in the mobile handset. The first method involves the use of subtractive noise cancellation employing correlators, the second uses a structure of IIR notch filters. Both solutions use control algorithms based on the state of the communication between the mobile handset and the base station. The video enhancement part presents two post-filters. These two filters are designed to improve visual quality of highly compressed video streams from standard, block-based video codecs by combating both blocking and ringing artifacts. The second post-filter also performs sharpening. The third part addresses the problem of measuring audio and video delay as well as skewness between these, also known as synchronization. This method is a black box technique which enables it to be applied on any audiovisual application, proprietary as well as open standards, and can be run on any platform and over any network connectivity. The last part addresses no-reference (NR) bitstream video quality prediction using features extracted from the coded video stream. Several methods have been used and evaluated: Multiple Linear Regression (MLR), Artificial Neural Network (ANN), and Least Square Support Vector Machines (LS-SVM), showing high correlation with both MOS and objective video assessment methods as PSNR and PEVQ. The impact from temporal, spatial and quantization variations on perceptual video quality has also been addressed, together with the trade off between these, and for this purpose a set of locally conducted subjective experiments were performed.
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Využití elektronického bankovnictví v účetnictví / The use of electronic banking in the accountancyMošovská, Eva January 2010 (has links)
This thesis deals with the use of electronic banking in the accountancy. The goal is to introduce the concept of electronic banking and its impact on accounting. The thesis describes the development of accounting and the impact of computer technology on the processing of accounting records and financial documents. The term of electronic signature and electronic brand are explained, as well as the possibilities of their applicaton. The thesis is to define the various forms of client (company) communication with the bank institutions and development of electronic banking as well as a summary of its advantages and disadvantages. The aim of the practical part is to evaluate the current state of direct banking service in the Czech Republic. The appendix includes a table with a list of e-filing of chosen particular tax types and overview of the structure of the questionnaire on the use of electronic banking.
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Webbaserad visning av positioner på karta / Web based presentation of positions on a mapEngström, Martin January 2010 (has links)
Today there are a big need for a system that delivers overview of all available units for different municipalities and shipping- and security companies due to the increasing requirements for efficiency. The purpose with this graduation thesis is to find out which systems that is suitable to use while developing cost-effective software for positioning and to produce a prototype for such solution. This assignment has been done at the request of PocketMobile Communications AB. PocketMobile is a company that are specialized on delivering modern mobile software solutions and systems to companies with their own vehicle fleet or mobile workers. This master thesis can be split into two separate parts, the theoretic- and the practical part. The theoretic part includes producing a number of functional requirements in cooperation with PocketMobile and comparing the available systems against the function requirements. The practical part deal with the development of a prototype that demonstrates the software recommended. The development tools that best matched the functionality requirements when the selection was made in May 2007 were Map24 and OpenLayers. The system that was selected to use while developing the prototype was Map24, because this product matches all of the requirements and it is also suited for professional usage regarding support, scalability and reliability. Map24 also have some advanced functions like ability to route plan for example. The prototype that has been developed is web based and the graphic design is similar to Google Maps.
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Influence des radiofréquences émises par le téléphone mobile GSM sur l'activité corticale auditive chez l'hommeMaby, Emmanuel 03 July 2003 (has links) (PDF)
Cette thèse s'inscrit dans le cadre des études menées sur les effets biologiques et sanitaires des radiofréquences associées à la téléphonie mobile. Le but de ce travail est d'évaluer l'influence des radiofréquences émises par le téléphone mobile sur l'activité corticale chez l'homme. Tout d'abord, un état des connaissances scientifiques relatives aux effets biologiques et sanitaires des radiofréquences associées à la téléphonie mobile a été dressé. Ensuite, on effectue une description du matériel et des méthodes d'acquisition des potentiels évoqués auditifs (PEA) caractéristiques de l'activité corticale auditive. De plus, on a sélectionné les électrodes qui recueillent les signaux les plus caractéristiques de PEA. Des variables dont certaines caractéristiques électrophysiologiques des PEA sont extraites et font l'objet d'une analyse statistique. Une sélection, basée sur la classification par Support Vector Machines, met en exergue les variables plus perturbées par les radiofréquences. Enfin, l'analyse statistique par électrode permet de localiser les effets des radiofréquences. On se consacre enfin à l'étude des signaux électroencéphalographiques en étudiant les coefficients de corrélations entre spectres et les densités spectrales de puissance par bande de fréquences. En conclusion, les radiofréquences émises par le téléphone mobile semblent montrer une incidence sur les potentiels évoqués auditifs et les signaux électroencéphalographiques. Cependant, aucun apport de causalité entre ces effets biologiques sur l'activité corticale et les effets néfastes sur la santé humaine ne peut être démontré à ce jour.
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4G LTE : eMBMS with MBSFN Service Simulation using OPNETWalid, Abdelrahman January 2014 (has links)
Long Term Evolution (LTE) known in the market as 4G LTE, it is an evolution of the GSM/UMTS standard. The overall aim of LTE was to provide a new radio access technology focusing on packet-switched data only. LTE has provided a new peak download rates, low data transfer latencies, and improved the support for mobility. 3Th Generation Partnership Project (3GPP) specialized that LTE released 10 and beyond known as LTE-advanced it is the second evolution of LTE. It has some services such as Coordinated Multipoint Transmission and Reception (CoMP), evolved Multimedia Broadcast and Multicast Service (eMBMS) with Multicast-Broadcast Single-Frequency Network (MBSFN). The development still continuous on LTE-advanced, it is intended to meet the requirement of advanced application that will become common in the wireless marketplace in future. The goals of this project is to simulate one of LTE-A services on LTE standard such as CoMP or/and eMBMS with MBSFN using OPENT LTE, and measure some statistic such as spectral efficiency and also some other statistics, describe centralization vs. decentralization in LTE, and synchronization in the base station in LTE. OPNET LTE support eMBMS with MBSFN, and don’t support CoMP, the simulation has been done by using eMBMS with MBSFN. Finally the objectives of the project has achieved, the result show that when eMBMS with MBSFN is implemented the throughput increased in the downlink to about 5.52 Mbps and in the uplink to about 5.18 Mbps, and also the system spectral efficiency increased in eNB1 from about 10.25 (bits/s/Hz/cell) to about 13.75 (bits/s/Hz/cell) and in eNB2 from about 10.25 (bits/s/Hz/cell) to about 17.25 (bits/s/Hz/cell). The project also answers if it is possible to have centralization in LTE, describe synchronization in the base station in LTE, and if OPNET is useful for big research.
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