University of Puerto Rico at Mayagüez Institutional Repository
Welcome to the University of Puerto Rico at Mayagüez Institutional Repository.
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Publication Open Access Edge-enabled intelligent framework for cyber threat classification and adaptive anomaly mitigation(2025-07-28)With the evolution of advanced next-generation applications the need to meet the low-latency requirements is necessary. By processing the information at edge, it is feasible to expedite the response. However, the edge processing presents cybersecurity threats. Most of the existing works focus on resolving one aspect such as anomaly detection, or adaptive learning. However, through our work we propose an edge-enabled intelligent framework that offers three main functionalities namely threat level classification, response code prediction, and anomaly score prediction. The proposed monolithic framework is validated on open-source dataset with numerous features. Preliminary evaluation results highlight the significance of our framework.Publication Open Access A preliminary study on quantum digital twins for IoT-enabled disaster management(2025-03-18)Natural disasters in large scale such as the wildfires in Los Angeles, and hurricanes results affects the global economy and livelihood greatly in addition to massive losses to human and cattle lives. Despite the presence of efficient disaster management systems such disasters are occurring frequently. With the advent of quantum computing numerous research works focus on the development of quantum digital twin (QDT) for improving the accuracy as well as the efficiency of the existing disaster management systems. However, most of the existing works on QDT suffer from limitations such as focus on particular disaster, and expensive. Therefore, through this work we intend to study the idea of developing a multi-hazard QDT that is cost-efficient, effective, and adaptable to meet the growing requirements. A four-layer based QDT system is proposed and studied in this paper. Preliminary evaluation results are included in this work to highlight the need of a multi-hazard QDT systems.Publication Restricted Cold gas spraying copper metal on AlN ceramic as an alternative to thick DBC substrates(2024-12)This dissertation investigates the use of Cold Gas Spraying (CGS) to deposit copper onto aluminum nitride (AlN) substrates as a viable alternative to thick Direct Bond Copper (DBC) substrates in power electronics packaging. The research begins by functionalizing the AlN surface through potassium hydroxide (KOH) etching, significantly increasing surface roughness and area, which enhanced the adhesion properties critical for effective CGS copper deposition. Key CGS parameters such as temperature, pressure, nozzle standoff distance, travel speed, substrate roughness, and deposition angle were systematically studied to optimize the copper coating quality. The deposition angle, in particular, emerged as a critical factor, with a 60-degree angle yielding the smoothest coating. A uniform 300 μm thick copper layer, comparable to that of commercial DBC substrates, was successfully achieved. The bonding mechanisms between copper and AlN were found to involve mechanical interlocking, plastic deformation, dynamic recrystallization, and grain refinement driven by temperature increases during particle impact, with the copper particle temperature reaching up to 693 K. These mechanisms contributed to strong interfacial bonding and minimal coating defects. Overall, this study demonstrates that CGS offers a promising alternative to conventional DBC substrates, providing high bond strength, excellent thermal stability, and defect-free coatings. The findings provide valuable insights into metal-ceramic bonding in CGS and establish a foundation for future research to further refine this technique for industrial applications in high-voltage and power electronics.Person Metadata only Publication Open Access Guía visual de insectos visitadores en flores de mangó(Estación Experimental Agrícola, 2025-08-30)Esta guía visual tiene los insectos visitadores en flores de cuatro cultivares de mangó (Julie, Keitt, Kent, Tommy Atkins) en fincas comerciales. Todos los insectos colectados visitaron ambas flores, hermafroditas y masculinas, en las inflorescencias colectadas. Los insectos identificados en esta guía como polinizadores eficientes y/o eficaces fueron aquellos que se le pudieron realizar las pruebas de eficiencia y eficacia. No todos los visitadores se pueden encontrar en los cuatros cultivares.
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