Você está acessando nosso website pela primeira vez. Nosso site, objetivando permitir, particularmente, uma melhor interação com você, bem como para permitir funcionalidades para melhorar o funcionamento técnico das páginas, mensurar a audiência do website e oferecer produtos e serviços relevantes por meio de anúncios personalizados, coleta informações do seu dispositivo e da sua navegação por meio de cookies. Para saber mais sobre a coleta de dados/informações e cookies que coletamos, acesse a nossa Política de Privacidade.

Aceitar Não aceitar

Para ver o formulário de contatos você aceita nossa Política de Privacidade.

Aceitar Não aceitar

Pasta maio

Documentos

default A Coding Scheme for Storage Popular

Por 3150 downloads

Baixar (pdf, 1.45 MB)

R_T_VOL 13_N02_14_A Coding Scheme for Storage.pdf

default Análise de cobertura de RF em um sistema GSM/EDGE utilizando o plugdata MG100 Popular

Por 5164 downloads

Baixar (pdf, 715 KB)

Análise de cobertura de RF (Artigo 5).pdf

Normal 0 21 false false false MicrosoftInternetExplorer4

Análise de cobertura de RF em um sistema GSM/EDGE utilizando o plugdata MG100

Fernandes Sales, Diego; Gomes Neto, Alfredo

Abstract: This work aims to analyze the RF coverage of a GSM/EDGE network located in João Pessoa, PB, Brazil. It was used PlugData MG100, a low cost GSM/EDGE modem, as an alternative mobile measurement tool. From the Móbile Measurement Reports (MMRs) RF coverage and the handover process are analyzed. This work analyzes only data referent to the serving cell and the two closest neighboring cells. The results were analyzed according to inter and intra-cell handover. It was identified quality of service issues related to the serving cell in the suburban areas. The signal level behavior was satisfactory in the open rural area outstanding the frequency planning aspect.

Index Terms: GSM/EDGE, handover, MMRs, PlugData MG100.

default Associação entre os Critérios Objetivo e Subjetivo na Classificação de Imagens Mamográficas Popular

Por 3991 downloads

Baixar (pdf, 1.07 MB)

Associação entre os Critérios (Artigo 3).pdf

Normal 0 21 false false false MicrosoftInternetExplorer4

Associação entre os Critérios Objetivo e Subjetivo na Classificação de Imagens Mamográficas Sujeitas a Compressão Fractal

Vergütz, Stéphany; Paschoarelli Veiga, Antônio Cláudio

Abstract: The objective of this study is to evaluate the performance of “Fractal Compression” technique onto mammograms through an association between the objective criteria, provided by Peak Signal Noise Ration (PSNR); and the subjective criteria, given by visual analysis of an expert physician. Visual analysis was performed comparing mammograms compressed to different extents (compression rate) with the original image, where experts classified the compressed images as “unacceptable”, “acceptable”, “good” or “great”. In doing so, the optimal compression rate and PSNR values of mammograms was achieved, where images are considered acceptable according to experts. In order to compare the performance of “Fractal Compression” technique with another compression method, visual analysis was also done on images compressed by JPEG2000 method.

Index Terms: Fractal Image Compression, Mammography, Peak Signal Noise Ratio.

default Comparação de Níveis de Radiações de Radiofreqüência Emitidas por Antenas Popular

Por 11951 downloads

Baixar (pdf, 225 KB)

Comparação de Níveis de Radiações de Radiofreqüência (Artigo 4).pdf

Comparação de Níveis de Radiações de Radiofreqüência Emitidas por Antenas de Estações Rádio-Base

Normal 0 21 false false false MicrosoftInternetExplorer4

Normal 0 21 false false false MicrosoftInternetExplorer4

Figueiredo, Carlos H. S.; Ramos, Glaucio L.; Pereira, Paulo T.; S. Júnior, Moacir; S. Queiroz, Carlos

Abstract: This work describes the basic concepts of electromagnetical theory related to non-ionizing radiation emission levels of the radio base station cellular mobile system based in current research. Research results were compared with norms established by agencies such as National Telecommunication Agency (ANATEL), the International Commission on Non-ionizing Radiation Protection (ICNIRP) and other bodies concerned with health-related studies. A comparison will be shown between radiation levels before and after the installation of a new radio base station. Normal 0 21 false false false MicrosoftInternetExplorer4

Index Terms: Non-ionizing radiation, radiofrequency, cellular phone, thermal effects.

default Development and Implementation of a Third Party Call Parlay X API for Application Development Popular

Por 4961 downloads

Baixar (pdf, 2.96 MB)

Development and Implementation (Artigo 6).pdf

Normal 0 21 false false false MicrosoftInternetExplorer4

Development and Implementation of a Third Party Call Parlay X API for Application Development in NGN

Pimenta Carvalho, Rodrigo; Marcos Alberti, Antônio

Abstract: The search for technologies to develop value-added services in Next Generation Networks created what is being called Information and Communication Technologies convergence or ICT. The success of such convergence will depend on, among other factors, adequately opening NGN capacities to support value-added applications development by IT community. Open APIs such like OSA/Parlay and Parlay X are being considered the “bridges”between both worlds. Despite such APIs, there are other technologies and several possible paths involved in this task. In this scenario, our paper firstly shows how next generation converged networks and its functionalities can be exposed properly to someone else, through Parlay X interfaces, implemented in Web Services-based application gateways. Therefore, this paper cames to fulfil the lack of literature regarding methodology for valueadded applications development in NGN. Secondly, we developed and implemented a Third Party Call Parlay X API inside a Parlay X gateway emulator to demonstrate how useful a gateway emulator could be in order to provide quick and correct design and implementation of NGN applications. Finally, we discuss the results obtained.

Index Terms: Service Creation, Value-Added Services, Web Services, Parlay X and NGN

default Ethernet-over-SDH: Technologies Review and Performance Evaluation Popular

Por 4243 downloads

Baixar (pdf, 1.15 MB)

Ethernet-over-SDH (Artigo 1).pdf

Normal 0 21 false false false MicrosoftInternetExplorer4
Ethernet-over-SDH: Technologies Review and Performance Evaluation

Alberti, Antônio Marcos; Fernandes, Roulien

Abstract: The Generic Framing Procedure, Virtual Concatenation and the Link Capacity Adjusting Scheme are successful technologies that brought new life to synchronous networks. They facilitated efficient, flexible and robust interconnection of two of the most deployed technologies ever: Ethernet and Synchronous Digital Hierarchy (SDH). The objective of this tutorial is to present an overview of these Ethernet-over-SDH (EoS) technologies, focusing on their performances. We reviewed literature from 2001-2009 and present the main aspects of EoS technologies and performance as well as notable formulations for EoS throughput, efficiency and delay.We reviewed the fundamental evolution steps of both Ethernet and SDH. The paper also covers experimental methodology and scenario configuration for EoS performance evaluation in the laboratory, discusses measured results and compares the presented analytical expressions and calculations with experimental data. An in-depth performance evaluation ofEoS networks is conducted.

Index Terms: Performance, Evaluation, SDH, GFP, LCAS, VCat

default Localização de Terminais Móveis utilizando Correlação de Assinaturas de Rádio-Frequência Popular

Por 3803 downloads

Baixar (pdf, 1.50 MB)

Localização de Terminais (Artigo 2).pdf

Normal 0 21 false false false MicrosoftInternetExplorer4

Localização de Terminais Móveis utilizando Correlação de Assinaturas de Rádio-Frequência

Normal 0 21 false false false MicrosoftInternetExplorer4

Saraiva Campos, Rafael; Lovisolo, Lisandro

Abstract: This tutorial presents in detail the main components of radio-frequency fingerprinting methods, also known as DCM (Database Correlation Methods), for mobile station positioning. Those methods can locate legacy terminals, i.e, without any specific location services support. Furthermore, as they are capable of yielding position estimates using measurements from a single reference base station, those methods have a high availability. Those characteristics make DCM suitable alternatives for emergency call positioning in cellular móbile networks and for fallback of more precise methods.

Index Terms: Cellular Mobile Networks, Correlation Database, Radio-Frequency Fingerprints, Radiolocation, Received Signal Strength.

default Revista Telecomunicações Vol 13 maio 2011 Popular

Por 1748 downloads

Baixar (pdf, 23.33 MB)

REVISTA_TELECOMUNICACOES_VOL_13_-_No_01_MAIO_2011_WEB.pdf

Tutoriais

Normal 0 21 false false false MicrosoftInternetExplorer4

Alberti, Antônio Marcos; Fernandes, Roulien

Abstract: The Generic Framing Procedure, Virtual Concatenation and the Link Capacity Adjusting Scheme are successful technologies that brought new life to synchronous networks. They facilitated efficient, flexible and robust interconnection of two of the most deployed technologies ever: Ethernet and Synchronous Digital Hierarchy (SDH). The objective of this tutorial is to present an overview of these Ethernet-over-SDH (EoS) technologies, focusing on their performances. We reviewed literature from 2001-2009 and present the main aspects of EoS technologies and performance as well as notable formulations for EoS throughput, efficiency and delay.We reviewed the fundamental evolution steps of both Ethernet and SDH. The paper also covers experimental methodology and scenario configuration for EoS performance evaluation in the laboratory, discusses measured results and compares the presented analytical expressions and calculations with experimental data. An in-depth performance evaluation ofEoS networks is conducted.

Index Terms: Performance, Evaluation, SDH, GFP, LCAS, VCat.

Saraiva Campos, Rafael; Lovisolo, Lisandro

Normal 0 21 false false false MicrosoftInternetExplorer4

Abstract: This tutorial presents in detail the main components of radio-frequency fingerprinting methods, also known as DCM (Database Correlation Methods), for mobile station positioning. Those methods can locate legacy terminals, i.e, without any specific location services support. Furthermore, as they are capable of yielding position estimates using measurements from a single reference base station, those methods have a high availability. Those characteristics make DCM suitable alternatives for emergency call positioning in cellular móbile networks and for fallback of more precise methods.

Index Terms: Cellular Mobile Networks, Correlation Database, Radio-Frequency Fingerprints, Radiolocation, Received Signal Strength.


Artigos Científicos


Vergütz, Stéphany; Paschoarelli Veiga, Antônio Cláudio

Abstract: The objective of this study is to evaluate the performance of “Fractal Compression” technique onto mammograms through an association between the objective criteria, provided by Peak Signal Noise Ration (PSNR); and the subjective criteria, given by visual analysis of an expert physician. Visual analysis was performed comparing mammograms compressed to different extents (compression rate) with the original image, where experts classified the compressed images as “unacceptable”, “acceptable”, “good” or “great”. In doing so, the optimal compression rate and PSNR values of mammograms was achieved, where images are considered acceptable according to experts. In order to compare the performance of “Fractal Compression” technique with another compression method, visual analysis was also done on images compressed by JPEG2000 method.

Index Terms: Fractal Image Compression, Mammography, Peak Signal Noise Ratio.

Normal 0 21 false false false MicrosoftInternetExplorer4

Figueiredo, Carlos H. S.; Ramos, Glaucio L.; Pereira, Paulo T.; S. Júnior, Moacir; S. Queiroz, Carlos

Abstract: This work describes the basic concepts of electromagnetical theory related to non-ionizing radiation emission levels of the radio base station cellular mobile system based in current research. Research results were compared with norms established by agencies such as National Telecommunication Agency (ANATEL), the International Commission on Non-ionizing Radiation Protection (ICNIRP) and other bodies concerned with health-related studies. A comparison will be shown between radiation levels before and after the installation of a new radio base station.

Index Terms: Non-ionizing radiation, radiofrequency, cellular phone, thermal effects.


Normal 0 21 false false false MicrosoftInternetExplorer4

Fernandes Sales, Diego; Gomes Neto, Alfredo

Abstract: This work aims to analyze the RF coverage of a GSM/EDGE network located in João Pessoa, PB, Brazil. It was used PlugData MG100, a low cost GSM/EDGE modem, as an alternative mobile measurement tool. From the Móbile Measurement Reports (MMRs) RF coverage and the handover process are analyzed. This work analyzes only data referent to the serving cell and the two closest neighboring cells. The results were analyzed according to inter and intra-cell handover. It was identified quality of service issues related to the serving cell in the suburban areas. The signal level behavior was satisfactory in the open rural area outstanding the frequency planning aspect.

Index Terms: GSM/EDGE, handover, MMRs, PlugData MG100.


Engenharia Aplicada


Normal 0 21 false false false MicrosoftInternetExplorer4

Pimenta Carvalho, Rodrigo; Marcos Alberti, Antônio

Abstract: The search for technologies to develop value-added services in Next Generation Networks created what is being called Information and Communication Technologies convergence or ICT. The success of such convergence will depend on, among other factors, adequately opening NGN capacities to support value-added applications development by IT community. Open APIs such like OSA/Parlay and Parlay X are being considered the “bridges”between both worlds. Despite such APIs, there are other technologies and several possible paths involved in this task. In this scenario, our paper firstly shows how next generation converged networks and its functionalities can be exposed properly to someone else, through Parlay X interfaces, implemented in Web Services-based application gateways. Therefore, this paper cames to fulfil the lack of literature regarding methodology for valueadded applications development in NGN. Secondly, we developed and implemented a Third Party Call Parlay X API inside a Parlay X gateway emulator to demonstrate how useful a gateway emulator could be in order to provide quick and correct design and implementation of NGN applications. Finally, we discuss the results obtained.

Index Terms: Service Creation, Value-Added Services, Web Services, Parlay X and NGN.

 

default roger Popular

Por 2033 downloads

default R_T_VOL 13_N 02_10_TCP Performancance Popular

Por 4019 downloads

Baixar (pdf, 1001 KB)

R_T_VOL 13_N 02_10_TCP Performancance.pdf

default R_T_VOL 13_N 02_11_An efficient algorithm Popular

Por 3403 downloads

Baixar (pdf, 379 KB)

R_T_VOL 13_N 02_11_An efficient algorithm.pdf

default R_T_VOL 13_N 02_12_A New Method to Improve Popular

Por 3043 downloads

Baixar (pdf, 2.82 MB)

R_T_VOL 13_N 02_12_A New Method to Improve.pdf

default R_T_VOL 13_N 02_1_Communication in Transportation (1) Popular

Por 4882 downloads

Baixar (pdf, 3.56 MB)

R_T_VOL 13_N 02_1_Communication in Transportation (1).pdf

default R_T_VOL 13_N 02_2_Lossless Image Compression Popular

Por 4007 downloads

Baixar (pdf, 1.76 MB)

R_T_VOL 13_N 02_2_Lossless Image Compression.pdf

default R_T_VOL 13_N 02_3_Nonlinear System Identification Popular

Por 3128 downloads

Baixar (pdf, 594 KB)

R_T_VOL 13_N 02_3_Nonlinear System Identification.pdf

default R_T_VOL 13_N 02_4_Building Scalable Distributed Popular

Por 4066 downloads

Baixar (pdf, 750 KB)

R_T_VOL 13_N 02_4_Building Scalable Distributed.pdf

default R_T_VOL 13_N 02_5_CAC and Uplink Scheduling Popular

Por 3434 downloads

Baixar (pdf, 888 KB)

R_T_VOL 13_N 02_5_CAC and Uplink Scheduling.pdf

default R_T_VOL 13_N 02_6_Evaluation of the Effects Popular

Por 3753 downloads

Baixar (pdf, 148 KB)

R_T_VOL 13_N 02_6_Evaluation of the Effects.pdf

default R_T_VOL 13_N 02_7_Development and Evaluation Popular

Por 3022 downloads

Baixar (pdf, 804 KB)

R_T_VOL 13_N 02_7_Development and Evaluation.pdf

default R_T_VOL 13_N 02_8_Challenges for Handovers Popular

Por 3983 downloads

Baixar (pdf, 908 KB)

R_T_VOL 13_N 02_8_Challenges for Handovers.pdf

Inatel

Instituto Nacional de Telecomunicações – Inatel

Campus em Santa Rita do Sapucaí - MG - Brasil

Av. João de Camargo, 510 - Centro - 37540-000

+55 (35) 3471 9200