https://repositorio.ufu.br/handle/123456789/20862 2026-04-05T15:49:12Z https://repositorio.ufu.br/handle/123456789/47116 Title: Cabos submarinos: evolução tecnológica, impactos na conectividade e repercussões para a educação brasileira 2025-09-15T00:00:00Z https://repositorio.ufu.br/handle/123456789/46139 Title: Proposta de desenvolvimento de um IED para medições de descargas parciais a baixo custo Abstract: In this work, a proof of concept of a data acquisition system for partial discharges was proposed. It is a system composed of hardware and software elements that make up an IED, including an acquisition module, a data processing unit and a human-machine interface. These characteristics, combined with several connectivity and mobility features, aim to create a device for use in the field. The system was submitted to tests with the objective of evaluating its data acquisition capacity and determining the minimum feasibility of the system, as well as its limitations, mainly. The preliminary results indicated a system capable of recording some pulses, but with a number of limitations regarding recording. As for the usability of the IED project, the system was considered relevant and promising, since it brings together in a single physical set sophisticated processing elements, advanced communication interfaces and all the basic accessories that give the system autonomy for use in field activities. All these elements contribute to creating a technological support structure for field work related to electrical measurements. 2024-05-07T00:00:00Z https://repositorio.ufu.br/handle/123456789/46093 Title: Soluções de Segurança Eletrônica em Usinas Fotovoltaicas: Tecnologias e Estratégias para Proteção de Infraestruturas Críticas Abstract: The growing demand for clean and renewable energy sources has driven the expansion of photovoltaic power plants (UFVs) across Brazil. However, these critical infrastructures face various operational and security challenges, especially due to their locations — whether in urban areas, where the risk of theft and vandalism is higher, or in rural zones, which are more exposed to wildfires, lightning strikes, and logistical difficulties. In this context, electronic security systems emerge as a strategic tool to ensure the continuity of energy generation and the protection of equipment. This study aims to analyze and compare different electronic security strategies used in UFVs, focusing on three technologies: barrier sensors, video analytics cameras, and sensitive fiber optics. The methodology involves a theoretical review of perimeter security and photovoltaic generation concepts, along with the simulation of real application scenarios using AutoCAD and IP Video System Design Tool to assess the implementation of the proposed systems in different environments. The results identify the advantages, limitations, and ideal application conditions of each technology, providing technical insights for selecting more effective and cost-efficient solutions. Thus, this study contributes to the development of more robust security projects tailored to the specific characteristics of each type of plant, in line with the growing demand for reliability and protection in the solar energy sector. 2025-05-06T00:00:00Z https://repositorio.ufu.br/handle/123456789/45562 Title: Simulação de uma Rede WLAN Padrão IEEE 802.11ax Usando o Simulador NS-3 Abstract: This project addresses the simulation of a wireless network standard IEEE 802.11ax operating in infrastructure mode through a network simulation software NS-3 (Network Simulator - 3). The simulation aimed to obtain the data throughput curve in Mbps as a function of the distance between the user terminal and the access point, as a function of the transport protocol used and as a function of variables such as modulation index, guard interval and bandwidth. For this simulation, a code was used that establishes a wireless network with the conditions described, written in C++ language available on the website of the company that developed the NS-3. Through the results obtained, it was found that the throughput does depend on the distance, as long as it is within the coverage area of the wireless network. Furthermore, it was observed that the throughput is strongly influenced by the guard interval between packets, the channel bandwidth and the MCS index that concerns the modulation index and error correction methods. 2025-03-28T00:00:00Z