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정동화(D.H.Jung),마상용(S.Y.Ma),진성호(S.H.Jin),장석형(S.H.Jang),박경석(K.S.Park) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
It is important at the vehicle planning stage to be able to estimate the amount of heat that maybe released to the engine coolant in the cooling system. In this study, author measured coolant temperature of some parts and flow rate which we necessary to analysis of thermal flow in an engine cooling system. Therefore, author determined parameters necessary for the optimum condition of cooling control to keep the heat engine performance.<br/>
엔진 워터 재킷 내의 냉각수 유동 가시화에 관한 연구 (Ⅰ)
박경석(K. S. Park),정동화(D. H. Jung),구본우(B. W. Koo) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
It is widely recognized that exhaust emissions, fuel consumption and engine torque are affected by engine cooling temperature. And a cooling system keeping the proper engine temperature would improve engine performance and efficiency. Parameters which are necessary for the optimum design of thermostat to keep the best engine performance are determined. In this study, author measured coolant flow characteristics of some parts and visualization in water jacket which are necessary to analysis of thermal flow in an engine cooling system.<br/>
PPG 신호를 활용한 고 정확도 제 1심음 및 제 2심음 자동 식별 알고리즘 개발
이수민(S. M. Lee),김부성(B. S. Kim),정동화(D. H. Jung),임홍준(H, J. Lim),박희준(H. J. Park),웨이췬(Qun Wei) 한국재활복지공학회 2021 한국재활복지공학회 학술대회논문집 Vol.2021 No.4
Heart disease is reported as a leading reason that caused human death around world. For the early prevention, using stethoscope to detect abnormalities of the heart sound is one of the most effective method so far. However, because of the noise that inside and outside of the tube of the stethoscope, and sujective judgement devided by the docter will cause the misdiagnosis. To improve the accuracy of the auscultation, in this study, a high-accuracy S1 and S2 heart sound automatic identification algorithm using PPG signal was developed. Based on the 3rd Shannon Energy algorithm, the parameters of the start and end points of S1 and S2 of the hear sound were found. Also, the P-peak value of the PPG signal were extracted and used to find the relationship with the S2 peak. The developed algorithm was conducted a performance test experiment and the rate of identification was higher than the exist algorithm.