Results 51 to 60 of about 85,510 (154)

Empresas e serviços de comunicação [PDF]

, 1996
Natureza específica de uma empresa de comunicação: dimensão organizacional, tipos, objectivos. Facetas e factores que condicionam /modelam as instituições mediáticas. Estratégias e grupos multimedia.
Carvalho, Anabela
core  

Redes “Fiber To The Home – FTTH”. O despertar de novos serviços de telecomunicações [PDF]

, 2009
Se ha poucos anos nao imaginavamos as nossas vidas sem o conforto proporcionado pela iluminacao artificial, fruto do desenvolvimento e proliferacao da producao, transporte e distribuicao de energia electrica, seguramente que nos dias de hoje e ...
Ramos, Sérgio
core   +1 more source

CNN‐Based Human Detection and Identification in Indoor Optical Camera Communication Systems Using a Wearable LED Strip

IET Optoelectronics, Volume 19, Issue 1, January/December 2025.
In this paper, we present an optical camera communication (OCC) system utilising a deep learning for indoor communication and monitoring with wearable LED strips and cameras. Specifically, we employ the YOLOv8 object detection model, based on convolutional neural networks (CNNs), to reliably detect a yellow safety jacket equipped with an LED strip in ...
Eleni Niarchou, Atiya Fatima Usmani, Vicente Matus, Jose Rabadan, Victor Guerra, Luis Nero Alves, Rafael Perez‐Jimenez   +6 more
wiley   +1 more source

Experimental Demonstration of 32‐PAM Optical Camera Communication Using a Low Cost and a High Cost Camera

IET Optoelectronics, Volume 19, Issue 1, January/December 2025.
We experimentally demonstrate the feasibility of using up to 32‐PAM in rolling shutter based optical camera communication. A decoding algorithm focused on circumventing the hardware limitations is proposed and the performance of two different cameras is compared.
Miguel Rêgo, Alexis A. Dowhuszko, Pedro Fonseca, Luís Nero Alves   +3 more
wiley   +1 more source

A Platform of Unmanned Surface Vehicle Swarms for Real Time Monitoring in Aquaculture Environments

Sensors, 2019
The Internet of Things (IoT) is a rapidly evolving technology that is changing almost every business, and aquaculture is no exception. In this work we present an integrated IoT platform for the acquisition of environmental data and the monitoring of ...
Daniela Sousa, Diego Hernandez, Francisco Oliveira, Miguel Luís, Susana Sargento   +4 more
doaj   +1 more source

Dynamic‐Balancing AutoML for Imbalanced Tabular Data With Adaptive Resampling and Complexity‐Aware Analysis

International Journal of Intelligent Systems, Volume 2025, Issue 1, 2025.
Handling class imbalance is a fundamental challenge in supervised learning, particularly in real‐world scenarios where minority classes are critical yet underrepresented. This paper presents a novel dynamic‐balancing pipeline that enhances automated machine learning (AutoML) performance on imbalanced tabular datasets.
Marcelo V. C. Aragão, Tiago de M. Pereira, Mateus de F. Carvalho, Felipe A. P. de Figueiredo, Samuel B. Mafra, Richard Murray   +5 more
wiley   +1 more source

Sistema de energia híbrido regenerativo (S.E.H.R.) para alimentação de estações de telecomunicações em Angola [PDF]

, 2009
Esta dissertação tem como objectivo demonstrar a aplicabilidade técnica associada a uma análise económica da aplicação de sistemas de energia híbridos regenerativos (S.E.H.R.) em equipamentos remotos de telecomunicações em território angolano.
Maurício, Carlos Armando Clara
core  

Classical channel bandwidth requirements in continuous variable quantum key distribution systems

IET Quantum Communication, Volume 5, Issue 4, Page 601-611, December 2024.
The reconciliation method for continuous variable quantum key distribution (CV‐QKD) systems is usually chosen based on its reconciliation efficiency. Nonetheless, one must also consider the requirements of each reconciliation method in terms of the amount of information transmitted on the classical channel. Such may limit the achievable key rates.
Margarida Almeida, Daniel Pereira, Armando N. Pinto, Nuno A. Silva   +3 more
wiley   +1 more source

Tecnologia de informação: competitividade e políticas públicas

RAE: Revista de Administração de Empresas, 1996
A partir de meados do século XIX até início do século XX, a introdução do telégrafo e do telefone, acompanhando o desenvolvimento das estradas de ferro, apoiou o desenvolvimento da empresa industrial e deu origem à empresa de produção em massa ...
Antonio Carlos Manfredini da Cunha Oliveira
doaj  

Designing rotational motion of charge densities on plasmonic nanostructures excited by circularly polarized light

Nanophotonics, Volume 13, Issue 26, Page 4751-4760, December 2024.
Abstract Rotational motion of charges in plasmonic nanostructures plays an important role in transferring angular momentum between light and matter on the nanometer scale. Although sophisticated control of rotational charge motion has been achieved using spatially structured light, its extension to simultaneous excitation of the same charge motion in ...
Naoki Ichiji, Takuya Ishida, Ikki Morichika, Daigo Oue, Tetsu Tatsuma, Satoshi Ashihara   +5 more
wiley   +1 more source