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김병재(Byeongjae Kim),김지웅(Jiwoong Kim),김예빈(Yebeen Kim),민경덕(Kyoungdoug Min) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
The automobile industry is shifting towards eco-friendly vehicles, and electric vehicles are gaining attention as a future transportation solution due to environmental concerns. In particular, lithium-ion batteries are becoming increasingly prominent for storing energy in electric cars. Since battery performance and lifespan are significantly impacted by temperature, it is vital to conduct research on a thermal management system to improve both performance and durability. In this research, a model was developed to efficiently dissipate heat from the battery cells, considering the unique characteristics of the components that make up the battery pack, including thermal pads, cooling fins, module casings, and pack casings. Temperature regulation of the battery was achieved through a combination of a coolant loop and a refrigerant loop. To validate the model, it was compared to experimental data gathered during six repeated drive cycles, ranging from 0% to 100% APS, and vehicle speeds varying from 4 km/h to 78 km/h, all within a 500-second timeframe. The accuracy of the model was quantitatively assessed using metrics such as Root Mean Square Error (RMSE) and Mean Absolute Percentage Error (MAPE), with MAPE indicating a strong agreement of results within 3%.
악성코드 특징정보(Feature)의 종류 및 시스템 적용 사례 연구
김병재(Byeongjae Kim),한상원(Sangwon Han),이재광(JaeKwang Lee) 한국정보보호학회 2021 情報保護學會誌 Vol.31 No.3
공격자는 공격을 성공적으로 수행하기 위해 악성코드를 주로 사용하며, 방어자는 공격자의 공격이 완성되는 최종 단계 이전에 악성코드를 탐지하여 무력화 할 수 있도록 노력하는 것이 매우 중요하다. 그래서 이를 선제적으로 식별하고 대응하기 위해 인공지능 분석, 연관분석, 프로파일링 등 다양한 분석 기법이 연구되어지고 있다. 이러한 분석 기법들은 사전에 악성코드의 특징을 파악하고 어떤 악성코드 특징정보를 분석할지 선택하는 것이 가장 중요하다. 본 연구에서는 악성코드 특징정보의 종류와 실제 시스템에 적용한 사례에 대해서 살펴보고자 한다.
수소 연료전지 자동차의 PEMFC 시스템 시뮬레이션 모델 개발
김예빈(Yebeen Kim),김지웅(Jiwoong Kim),김병재(Byeongjae Kim),민경덕(Kyoungdoug Min) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
A proton exchange membrane fuel cell (PEMFC) in a hydrogen-powered electric bus serves as an energy conversion device, converting the chemical energy from hydrogen fuel into electrical energy. This process produces water and heat as by-products through electrochemical reactions. The fuel cell system comprises a fuel cell stack and a Balance of Plant (BOP) system. The BOP system includes components like an air supply system for providing oxygen and hydrogen, a reactor, a hydrogen supply system, and a thermal management system (TMS) responsible for maintaining an operational temperature range of 60 to 80℃ by dissipating the heat generated by the fuel cell. In this study, the system model of fuel cell electric vehicle(FCEV) is developed using AMESIM with a relative error of <10%. The interactions between stack electrical performances, reactants consumption and heat generation can be predicted using developed the model.
김지웅(Jiwoong Kim),심재봉(Jaebong Sim),김예빈(Yebeen Kim),전현수(Hyunsoo Chun),장정효(Junghyo Chang),김병재(Byeongjae Kim),민경덕(Kyoungdoug Min) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
A proton exchange membrane fuel cell (PEMFC) is an energy conversion device that converts chemical energy into electrical energy, generating water and heat as by-products of an electrochemical reaction. A fuel cell system consists of a fuel cell stack and balance of plants (BOP), and it is essential to develop a PEMFC unit cell model according to operating conditions in order to efficiently control the system. In this study, a PEMFC unit cell model was developed through the governing equation of the physical phenomena of each component of the unit cell, and the developed model was verified through comparison with PEMFC experimental data under various operating conditions (such as temperature, pressure, and relative humidity). The developed unit cell model and experimental data were shown to be in good agreement with a relative error of <3%.