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The 3-Bit Gray Counter Based on Magnetic-Tunnel-Junction Elements
Seungyeon Lee,Nakmyeong Kim,Heejung Yang,Gamyoung Lee,Seungjun Lee,Hyungsoon Shin IEEE 2007 IEEE transactions on magnetics Vol.43 No.6
<P>A magnetic-tunnel-junction (MTJ) element has been widely studied for data storage applications. An MTJ element can also be used to compute Boolean functions and store the output result. A magnetologic device based on this MTJ element can constitute sequential logic functions as well as combinational logic. Counter is one of the most frequently used sequential logic blocks in digital logic systems. In this paper, a novel architecture of a 3-bit gray counter based on magnetologic elements is presented. It is shown that ten MTJ elements with complementary metal-oxide-semiconductor (CMOS) circuits for sense amplifier and writing-current driver can make a 3-bit gray counter. HSPICE simulation results are presented to verify the functionality of the proposed circuits</P>
수소연료전지 버스의 비선형 모델 예측 제어를 활용한 실시간 동력 분배 제어 알고리즘
이승연(Seungyeon Lee),이주인(Jooin Lee),임종원(Jongwon Lim),이형철(Hyeongcheol Lee) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
In this paper, power distribution control algorithm for fuel cell electric bus was developed. Power distribution control algorithm is developed by using Gradient based Model Predictive Control(GRAMPC). Algorithm considered vehicle’s system characteristics like fuel cell, battery, motor and vehicle dynamics. Cost function is developed with considering battery’s State-of-charge and consumption ratio of fuel cell. GRAMPC can execute nonlinear model predictive control algorithm with real-time environment. Driving scenario is developed including real world traffic condition by using SUMO and Autonomie. Algorithms is validated in real-time simulation environment with dSPACE RCP-HIL simulator.
수치해석을 활용한 전기차 이차 루프 히트펌프 시스템의 R290 냉매 누설 시 안전성 평가
이승연(Seungyeon Lee),최종민(Jongmin Choi),이대웅(Daewoong Lee),이해준(Haejun Lee),김민수(Min Soo Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
With increasing interest in environmental protection, the technologies related with electric vehicles are rapidly developing. Among them, heat pump technology is attracting attention as it can extend the mileage at winter, through efficient heating. On the other hand, the refrigerant applied to the heat pump system also needs to be more eco-friendly. One of the candidates, R290, has excellent thermal properties but also has high flammability of A3 grade. Although the secondary-loop heat pump system can block the flow of the refrigerant into the cabin in case of leakage, it is necessary to evaluate the risk of ignition in the underhood of the vehicle for safer operation. Therefore, we established a model to analyze the safety of R290 leakage of secondary-loop heat pump system for an electric vehicle, and investigated the effect of various driving conditions and leakage situations on the risk.