Sergios Villette | Mechanical Engineering | Best Researcher Award

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Mr. Sergios Villette | Mechanical Engineering | Best Researcher Award

MEng, PhD Candidate Researcher, LTT/NTUA, Greece

Alexandros Alexiou is a mechanical engineer and researcher specializing in sustainable aviation fuel technologies and aeroengine combustion modeling. He is currently pursuing a Ph.D. in Mechanical Engineering at the National Technical University of Athens (NTUA), focusing on the experimental evaluation and modeling of alternative fuels in aircraft engines. His research involves aeroengine combustion chamber modeling, uncertainty quantification in aerodynamics, and innovative propulsion systems. Alexandros has collaborated on major projects with industry leaders such as SAFRAN Group and HELPE Group. With expertise in CFD simulations, mechanical design, and programming, he has contributed to the advancement of bio-kerosene utilization and non-conventional combustion. He has published in peer-reviewed journals, including Aerospace, where his work was featured on the journal cover. In addition to his research, he has experience as a tutor, robotics teacher, and machinist, demonstrating his diverse technical and academic expertise.

Profile.

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Education

Alexandros Alexiou is currently pursuing a Ph.D. in Mechanical Engineering at the National Technical University of Athens (NTUA), focusing on sustainable aviation fuel technologies in aircraft propulsion systems. His doctoral research is funded by NTUA’s Special Account for Research Grants Scholarship. He holds a Master’s & Bachelor’s Degree in Mechanical Engineering from NTUA, specializing in Air and Ground Transfer Vehicles, with a GPA of 7.8/10. During his undergraduate studies, he conducted a diploma thesis on aerodynamic uncertainty quantification at the Parallel CFD & Optimization Unit (PCOpt) of LTT/NTUA, utilizing OpenFOAM and in-house codes. He completed his high school education at the 2nd General Lyceum of Corfu, achieving a GPA of 19.3/20. His strong academic foundation in aerodynamics, propulsion, and computational simulations has prepared him for cutting-edge research in aviation fuels, energy efficiency, and combustion modeling.

Experience 

Alexandros Alexiou is a Research Associate at the Laboratory of Thermal Turbomachines (LTT), NTUA, specializing in aeroengine combustion modeling and alternative fuel technologies. His research includes developing PROOSIS models for water evaporation and hydrogen combustion in collaboration with SAFRAN Group. He has also worked on the Lipid4fuel project, investigating bio-kerosene use in aircraft engines. Beyond research, Alexandros has diverse professional experience. He worked as a freelance tutor for engineering courses, a STEM/robotics teacher for primary school students, and a restaurant waiter during summer seasons. His technical background includes hands-on experience as a welder-machinist at Machine Shop L. Zorbas, gaining practical skills in mechanical fabrication. His expertise in CFD simulations, mechanical design, and programming allows him to contribute effectively to the advancement of sustainable aviation fuels and innovative propulsion systems. His interdisciplinary approach bridges engineering theory and practical applications in aviation and energy research.

Awards & Honors 

Alexandros Alexiou has received multiple prestigious awards in science and engineering competitions. In 2015, he was honored by the Association of Greek Chemists for his outstanding performance in the 29th National Chemistry Competition, securing an 85/100 score. In 2015, he placed 20th in the “Aristotle” National Physics Competition, earning recognition from the Association of Greek Physicists. He also received an award from the Hellenic Mathematical Society for his success in the “Thalis” National Mathematical Competition in 2014, showcasing his analytical and problem-solving skills. In addition to academic awards, he holds a DALF C2 certification in French from the Ministère de l’Éducation Nationale de la République Française and a Certificate of Proficiency in English (CPE) from the University of Cambridge, demonstrating bilingual proficiency. His achievements reflect a strong foundation in STEM disciplines, positioning him as a rising expert in mechanical engineering and aviation research.

Research Focus 

Alexandros Alexiou’s research focuses on sustainable aviation fuel technologies, aeroengine combustion modeling, and uncertainty quantification in aerodynamics. His Ph.D. work at NTUA involves experimental evaluation and modeling of biofuels and hydrogen-based propulsion systems, aiming to develop eco-friendly alternatives to conventional jet fuels. He specializes in computational fluid dynamics (CFD), chemical reactor networks, and non-intrusive uncertainty quantification for optimizing aircraft engine performance and emissions reduction. His expertise extends to hydrogen combustion modeling, bio-kerosene integration, and advanced propulsion systems. Alexandros has actively contributed to industry-driven projects, including SAFRAN’s PROOSIS modeling for hydrogen combustion and the Lipid4fuel project, a collaborative effort to assess bio-kerosene applications in aviation. His research integrates simulation tools such as OpenFOAM, ANSYS, and Cantera with experimental testing and industrial collaboration, driving innovation in green aviation technologies. His work aims to shape the future of sustainable air transportation and next-generation propulsion systems.

Publications

 

📖 Villette S, Adam D, Alexiou A, Aretakis N, Mathioudakis K. A Simplified Chemical Reactor Network Approach for Aeroengine Combustion Chamber Modeling and Preliminary Design. Aerospace. 2024; 11(1):22. 🔗 DOI (🌟 Journal Cover Feature)

📜 Diploma Thesis: Non-intrusive Polynomial Chaos Expansion for Aerodynamic Uncertainty Quantification & Robust Design with Manufacturing Uncertainties. Advisor: K. C. Giannakoglou, NTUA (2022).

Conclusion

The candidate demonstrates exceptional research potential in mechanical engineering and sustainable aviation fuels, making them a strong contender for the Best Researcher Award. Their work in combustion chamber modeling, bio-kerosene usage, and computational mechanics aligns with cutting-edge research trends.

JAEHYUK CHOI | Materials and Structures | Best Researcher Award

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Mr. JAEHYUK CHOI | Materials and Structures | Best Researcher Award

Assist Prof Dr at National Korea Maritime and Ocean University, South Korea

Mr. JAEHYUK CHOI is a distinguished professor at Korea Maritime and Ocean University with expertise in mechanical and marine engineering. After earning his Ph.D. from Hokkaido University, Japan, he has contributed significantly to fields like combustion engineering, high-temperature hydrogen production, and space utilization engineering. His professional journey includes a blend of academia, research, and industry advisory roles, including postdoctoral work at the Korea Atomic Energy Research Institute and advisory roles for Korea’s Ministry of Ocean and Fisheries. He has published extensively on air pollution control and hydrogen production modeling, contributing to global research initiatives.

Publication Profile

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Education 🎓

Ph.D. in Mechanical Science (2005) – Hokkaido University, Japan (Advisor: Prof. Osamu Fujita) M.S. in Marine Engineering (2000) – Korea Maritime University, Korea (Advisor: Prof. Seok-Hun Yoon) B.S. in Marine Engineering (1996) – Korea Maritime University, Korea His educational journey has provided him with a robust foundation in mechanical and marine engineering, focused on areas such as combustion, fluid flow, and hydrogen production. The combination of Japanese and Korean maritime expertise enables him to develop cutting-edge models for air pollution control, combustion technologies, and high-temperature electrolysis, contributing to cleaner maritime operations. 🌐🌬️🚢

Experience 👨‍✈️

Naval Officer – 1996-1998 (Navy R.O.T.C 41, Korea) Researcher – 2000-2001 (Korea Maritime University) Research Student – 2001 (Hokkaido University, Japan Postdoctoral Researcher – 2005-2007 (Korea Atomic Energy Research Institute)  BK21 Assistant Professor – 2007-2009 (Seoul National University)  Assistant/Associate/Professor – 2009-present (Korea Maritime and Ocean University) Policy Advisory Council – 2017-2019 (Ministry of Ocean and Fisheries)  Visiting Scholar – 2019-2021 (University of Missouri) Mr. JAEHYUK CHOI has a rich professional background combining military service, academic research, and advisory roles. His international experience includes collaborations in Japan and the United States, broadening his expertise in nuclear hydrogen and marine engineering. 🛠️🌍

Awards and Honors🏆

Minister Citation – Ministry of Ocean and Fisheries (2018) Best Teacher Award – Korea Maritime and Ocean University (2014, 2017) 2000 Outstanding Intellectuals – IBC (2016) Minister Citation – Ministry of Science, ICT, and Future Planning (2015) Certificate – President of KMOU (2013, 2014) Outstanding Paper – Japan Society of Mechanical Engineers (2007 Outstanding Paper – Korean Society of Marine Engineering (2006 Certificate – Korea Atomic Energy Research Institute (2006) Mr. JAEHYUK CHOI has received numerous awards, recognizing his contributions to marine engineering and academia. His dedication to research and teaching is reflected in prestigious ministerial citations and multiple best paper awards from renowned engineering societies. 🏅📚🎖️

Publication  Top Notes

Experimental and numerical studies on performance investigation of a diesel engine converted to run on LPG
Authors: Kuk Kim, J., Lee, W.-J., Ahn, E., Choi, J.-H.
Published in: Energy Conversion and Management, 2024, 321, 119091
Summary: This paper investigates the performance of diesel engines converted to operate on LPG (liquefied petroleum gas). The study combines both experimental and numerical methods to analyze fuel efficiency, emissions, and engine performance.

Review of noise and vibration reduction technologies in marine machinery: Operational insights and engineering experience
Authors: Park, M.-H., Yeo, S., Choi, J.-H., Lee, W.-J.
Published in: Applied Ocean Research, 2024, 152, 104195
Summary: This review focuses on technologies aimed at reducing noise and vibration in marine machinery. The authors compile operational insights and lessons learned from engineering practices, emphasizing the importance of reducing environmental and human impacts in maritime applications.

Experimental evaluation of the significance of scheduled turbocharger reconditioning on marine diesel engine efficiency and exhaust gas emissions
Authors: Nyongesa, A.J., Park, M.-H., Lee, C.-M., Hur, J.-J., Lee, W.-J.
Published in: Ain Shams Engineering Journal, 2024, 15(8), 102845
Summary: This article presents an experimental study evaluating the impact of scheduled turbocharger reconditioning on the efficiency of marine diesel engines and associated exhaust gas emissions. The findings emphasize the importance of maintenance schedules for optimizing engine performance and reducing emissions.

Effects of natural gas admission location and timing on performance and emissions characteristics of LPDF two-stroke engine at low load
Authors: Nyongesa, A.J., Choi, J.-H., Lee, J.-W., Kim, J.-S., Lee, W.-J.
Published in: Case Studies in Thermal Engineering, 2024, 56, 104241
Summary: This paper investigates the effects of natural gas admission timing and location on the performance and emissions of low-pressure dual-fuel (LPDF) two-stroke engines. The results are crucial for optimizing engine operations under low-load conditions.

Estimation of greenhouse gas emissions from ships registered in South Korea based on activity data using the bottom-up approach
Authors: Yeo, S., Kuk Kim, J., Choi, J.-H., Lee, W.-J.
Published in: Journal of Engineering for the Maritime Environment, 2024
Summary: This study uses a bottom-up approach to estimate greenhouse gas emissions from ships registered in South Korea. The authors focus on activity data, providing a detailed methodology for assessing emissions from maritime transportation.

LPG, Gasoline, and Diesel Engines for Small Marine Vessels: A Comparative Analysis of Eco-Friendliness and Economic Feasibility
Authors: Kim, J.K., Yeo, S., Choi, J.-H., Lee, W.-J.
Published in: Energies, 2024, 17(2), 450
Summary: This article compares LPG, gasoline, and diesel engines for small marine vessels, focusing on their eco-friendliness and economic feasibility. The paper highlights LPG as a potential environmentally friendly alternative to traditional fuels.

Impact of K-H Instability on NO Emissions in N₂O Thermal Decomposition Using Premixed CH₄ Co-Flow Flames and Electric Furnace
Authors: Park, J., Kim, S., Yu, S., Choi, J.-H., Yoon, S.H.
Published in: Energies, 2024, 17(1), 96
Summary: This study examines the impact of Kelvin-Helmholtz (K-H) instability on nitrogen oxide (NO) emissions during nitrous oxide (N₂O) thermal decomposition in premixed methane co-flow flames. The findings contribute to understanding combustion instability’s role in emission characteristics.

Feasibility study on bio-heavy fuel as an alternative for marine fuel
Authors: Kim, J.-S., Choi, J.-H.
Published in: Renewable Energy, 2023, 219, 119543
Summary: This feasibility study explores the potential of bio-heavy fuel as a sustainable alternative to conventional marine fuels. The paper assesses the environmental and economic impacts of using bio-heavy fuel in maritime applications.

Corrigendum: Effects of hydrogen mixture ratio and scavenging air temperature on combustion and emission characteristics of a 2-stroke marine engine
Authors: Pham, V.C., Kim, J.-S., Lee, W.-J., Choi, J.-H.
Published in: Energy Reports, 2023, 9
Summary: The corrigendum addresses errors in a previously published article related to hydrogen mixture ratios and scavenging air temperature’s effects on two-stroke marine engine performance and emissions.

Effects of hydrogen mixture ratio and scavenging air temperature on combustion and emission characteristics of a 2-stroke marine engine
Authors: Pham, V.C., Kim, J.-S., Lee, W.-J., Choi, J.-H.
Published in: Energy Reports, 2023, 9, pp. 195–216

Conclusion

The candidate is highly suitable for the Best Researcher Award due to their comprehensive expertise, significant professional experience, and numerous accolades. Their research has substantial implications for environmental sustainability and technological advancement. By focusing on improving their publication output and fostering industry collaborations, the candidate can further solidify their impact and leadership in their field. Overall, the candidate’s strengths make them an exemplary choice for this prestigious award.