https://repositorio.ufu.br/handle/123456789/5145 2026-08-24T16:30:59Z https://repositorio.ufu.br/handle/123456789/49679 Title: Uma Análise Detalhada do Funcionamento de QR Codes 2026-03-20T00:00:00Z https://repositorio.ufu.br/handle/123456789/49654 Title: Comparação entre o impacto de diferentes datasets em modelos de redes neurais artificiais na detecção de intrusões em redes de computadores 2026-06-03T00:00:00Z https://repositorio.ufu.br/handle/123456789/49651 Title: Análise paramétrica e projeto de superfícies seletivas em frequência para aplicações na banda n78 do 5G Abstract: This work presents a parametric analysis and the design of Frequency Selective Sur- faces (FSS) aimed at operation in the n78 band (3300 to 3800 MHz) of 5G telecom- munications networks. The main objective of this study is to evaluate how variations in the geometric parameters of different metallic scatterers and the properties of dielectric substrates influence the performance and electromagnetic response of these structures. To circumvent the high computational cost of full-wave simulations during the synthesis phase, an iterative analytical simulator named "FSS Explorer"was developed, based on the Equivalent Circuit Model (ECM). Through this software, two distinct topologies of band-stop elements were analyzed and optimized: Square Loop and Jerusalem Cross, aiming to tune the fundamental resonance frequency to 3.55 GHz over various commercial laminates. The design validation was performed through cross-comparison of the analytical data with rigorous simulations in the Ansys HFSS software. The results attest to the excellent predictive accuracy of the analytical equations in determining the center frequency, especially in elementary geometries such as the Square Loop, consolidating the co-simulation methodology and the developed tool as highly efficient instruments for reducing the time and computational effort in the pre-design of spatial filters for 5G. 2026-07-30T00:00:00Z https://repositorio.ufu.br/handle/123456789/49555 Title: Telemetry performance comparison between gNMI and SNMP in IP/MPLS network architecture Abstract: The exponential growth of data traffic in Service Provider environments demands highly accurate and real-time network observability. Traditionally, the Simple Network Management Protocol (SNMP) has been the standard for network monitoring; however, its pull-based polling architecture presents limitations in detecting transient anomalies. This study presents a comparative performance analysis between SNMP and the modern, push and Remote Procedure Call (RPC) based gRPC Network Management Interface (gNMI). By using Infrastructure as Code (IaC) principles, a multi-vendor routing environment comprising Juniper and Arista nodes was virtualized using the Containerlab orchestration framework. The methodology subjected the observability pipeline to deterministic control-plane and data-plane anomalies, including volumetric Distributed Denial of Service (DDoS) bursts, Border Gateway Protocol (BGP) route flapping, and Label Distribution Protocol (LDP) intermittency. The research concludes that gNMI provides high-fidelity visibility (better spikes view) and lower operational overhead (39%-50% less CPU usage) for modern autonomous networks, recommending a phased migration strategy for production environments. 2026-08-05T00:00:00Z