Trabalho de Evento
URI permanente desta comunidadehttps://repositorio.insper.edu.br/handle/11224/3235
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Resultados da Pesquisa
Trabalho de Evento Study of The Concept of Diesel and Ethanol Dual-Fuel in a SIngle-Cylinder Research Engine(2024) Dias, Fábio Jairo; Lacava, Pedro Teixeira; Oliveira, Enrico Rapetti Malheiro de; Argachoy, CelsoThis study examines the concept of dual-fuel combustion, and focuses in particular on the combination of diesel and ethanol in a compression ignition engine. Ethanol, as a renewable fuel source, plays a fundamental role in reducing dependence on fossil fuels and reducing greenhouse gas emissions. In the test setup ethanol is injected into the intake manifold (Port-Fuel Injection, PFI), while diesel is injected directly into the combustion chamber (Direct Injection, DI). The engine under investigation is a single-cylinder research engine designed to run on two fuels. In this configuration, diesel acts as the ignition fuel, which stimulates the ignition of the ethanol-air mixture. The aim of this study was to analyze the highest rate of substitution of diesel by ethanol while reducing engine load. In the method used the engine was first operated with diesel and ethanol. Subsequently, the ethanol injection was stopped, which led to a decrease in engine load. In order to correct the engine performance and achieve the same load again, the mass of the injected diesel had to be increased. This method has shown that it is possible to achieve the same workload with an ethanol fraction as with diesel alone.. In terms of thermodynamic and emission results, substituting a fraction of diesel with an equivalent amount of ethanol to achieve the same IMEP (Indicated Mean Effective Pressure) is a viable alternative. In addition the presence of ethanol was found to retard combustion compared to running on 100% diesel. The emission results show that dual-fuel operation keeps soot levels close to those achieved when running on diesel alone.Trabalho de Evento Extended Reality System for Robotic Learning from Human Demonstration(2025) Ngui, Isaac; McBeth, Courtney; He, Grace; Santos, André Corrêa; Morales, Marco; LUCIANO PEREIRA SOARES; Amato, Nancy M.Many real-world tasks are intuitive for a human to perform, but difficult to encode algorithmically when utilizing a robot to perform the tasks. In these scenarios, robotic systems can benefit from expert demonstrations, wherein human operators physically move the robot along trajectories, to learn how to perform each task. In many settings, it may be difficult or unsafe to use a physical robot to provide these demonstrations, for example, considering cooking task such as slicing with a knife. Extended reality provides a natural setting for demonstrating robotic trajectories while bypassing safety concerns and providing a broader range of interaction modalities. We propose the Robot Action Demonstration in Extended Reality (RADER) system, a generic extended reality interface for learning from demonstration. We additionally present its application to an existing state-of-the-art learning from demonstration approach and show comparable results between demonstrations given on a physical robot and those given using our extended reality system.Trabalho de Evento Evaluating mastery-oriented grading in an intensive CS1 course(2024) Montagner, Igor dos Santos; RAFAEL CORSI FERRÃO; Kurauchi, Andrew; Silva, Mariana; Zilles, CraigAllowing students to re-attempt assessments has been shown to be effective in traditional university-level courses in improving student mastery of course content. In this paper, we analyse an intensive programming introductory experience, where first semes ter university students’ full load is a single semester-long course that teaches the basics of programming and software engineering. We study its use of mastery-based grading: offering five (formative) low-stakes quizzes (with retakes), each focused on a single topic, and five (summative) higher-stakes exams that assess all learn ing objectives. Our research questions are: (i) “Do second chances help students to increase their performance over time in intensive courses?”; and (ii) “Are second chances effective in reducing stress/- mental load/weight of assessments in intensive courses?”. We find that (i) offering second chances on quizzes decreases the number of students at risk of failing before the first exam; (ii) students’ proficiency in coding tasks (as measured by exam grades) improve during the semester; and (iii) that our schedule reduces anxiety and mental load for students, but only after students take the first chance.Trabalho de Evento Cybersecurity Monitoring/Mapping of USA Healthcare (All Hospitals) - Magnified Vulnerability due to Shared IT Infrastructure, Market Concentration, & Geographical Distribution(2024) Yurcik, William; Schick, Andreas; North, Stephen; Gastner, Michael T.; FABIO ROBERTO DE MIRANDA; RODOLFO DA SILVA AVELINO; ANDRE FILIPE DE MORAES BATISTA; Pluta, Gregory; Brooks, IanIn October 2024, there are two defining characteristics of a healthcare provider: (1) geographic location and services available at their physical structure and (2) Internet connectivity and services available via their virtual presence. For previous centuries we focused on the first defining characteristic and now we need to shift to understand and address issues that may arise from the new second defining characteristic. In this paper we address issues related to Internet connectivity and virtual presence of USA healthcare providers, especially hospitals, when ransomware cyberattacks resulting in service outages occur. We show the cybersecurity posture of a large critical national infrastructure (USA healthcare) can be measured, mapped, and quantitatively baselined. Empirical results reveal systemic issues in USA healthcare presenting "magnified vulnerabilities" in that a single exploit can have an outsized impact on an entire nationwide infrastructure. As the initial step toward addressing this issue, we document for the first time the magnified cybersecurity vulnerability of USA healthcare to shared IT infrastructure, market concentration, and the geographical distribution of hospitals.