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윤승재(Seungjae Yun),이경수(Kyongsu Yi) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Current research shows that applying hybrid system to vehicle is expected to successful improvement in fuel consumption and emission compared with conventional vehicle. This paper focuses on modeling and control strategies of heavy duty series hybrid electric vehicle to improve the fuel economy of the system. Vehicle model is developed based on the MATLAB Simulink and model validation is carried out by using the simulation results for representative driving modes. The power management strategies for series hybrid electric vehicle are developed in order to obtain reduced fuel consumption and maintain the battery SOC(State of Charge) within reasonable operating region. The global optimal solution has been found by using dynamic programming method. The rule-based controller and the ECMS(Equivalent fuel Consumption Minimization Strategy) controller have been developed and applied to the series hybrid electric vehicle.
최적연비성능과 배출가스 저감을 위한 동력관리 제어 연구
윤승재(Seungjae Yun),이경수(Kyongsu Yi) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Current research shows that it is possible to improve fuel economy and reduce emission compared with conventional vehicle by applying hybrid system to the vehicle. This paper describes a development of controller for a heavy duty series hybrid electric vehicle to improve the fuel economy and to reduce tailpipe emission. Vehicle model components are developed and integrated to design a controller. Model validation is performed by using the simulation results for representative driving modes. The power management controller proposed in this research is developed in order to obtain reduced fuel consumption, maintain the battery SOC(State of Charge) within proper operating region and reduce tailpipe emission. The ECMS(Equivalent fuel Consumption Minimization Strategy) is applied to develop controller.
윤승재(Seungjae Yun),최재웅(Jaewoong Choi),이경수(Kyongsu Yi) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper describes power management control strategy for series hybrid electric vehicle(SHEV). To evaluate improvement of fuel economy due to hybridization of conventional vehicle, series hybrid electric vehicle model which consists of electric driving motor, generator and battery are added to conventional vehicle model is developed. Model validation is conducted to improve accuracy by using experiment data. Considering required power and state of charge(SOC), controller determines amount of power produced by engine-generator then decides optimal operating point. Performance of designed controller is verified via comparison of fuel consumption when vehicles travel representative driving cycle.
에너지 효율 향상을 위한 6륜 인휠 모터 차량의 토크 분배 전략
윤승재(Seungjae Yun),이경수(Kyongsu Yi),정성용(Seongyong Joung),왕지현(Jihyun Wang),김종원(Jongwon Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This paper describes a motor torque control of six-wheel-driven electric vehicles for improved energy economy. In this research, this controller coordinates each driving motor torque to minimize total energy consumption under given required power condition. The controller consists of upper and lower level controller. The upper level controller determines required torque of the vehicle. The required torque is calculated by acceleration pedal input and vehicle velocity. The lower level controller determines energy consumption of motors in given condition and coordinates motor torque to minimize vehicle energy consumption. In coordinating optimal motor torque, motor efficiency is determined by motor speed and operating torque and maximum torque is a function of motor speed. Simulation studies are conducted to evaluate proposed motor torque controller and compare with conventional controller.
Clinical Impact of Coronavirus Disease 2019 Outbreaks in Korea on Seizures in Children
Seungjae Lee,Su-Kyeong Hwang,Yun-Jeong Lee,Hyunwoo Bae,Soonhak Kwon 대한소아신경학회 2024 대한소아신경학회지 Vol.32 No.3
Purpose: Coronavirus disease 2019 (COVID-19) can be associated with neurological complications. This study investigated the impact of COVID-19 outbreaks on seizure incidence and duration in children in Korea. Methods: We retrospectively analyzed medical records from Kyungpook National University Children’s Hospital, including 768 children with seizures during the peak COVID-19 outbreaks in March and August 2022, and compared patterns with the same periods in 2021. We examined demographic and clinical characteristics, causes of seizures, underlying conditions, seizure durations, and COVID-19 test results. Results: Out of 16,373,836 COVID-19 cases during the first peak, 25.6% were children (4,184,383), and during the second peak, 20.5% of 6,400,244 cases were children (1,314,331). No significant age differences were observed between either peak and the previous year. However, when compared to the previous year, febrile seizures (FS) were more common during both peaks (25.9% vs. 65.1% in the first peak; 34.3% vs. 59.2% in the second peak). The prevalence of FS was significantly higher in the COVID-19-positive group (84.1%) than in the COVID-19-negative group (51.9%). The incidence of new-onset seizures or breakthrough seizures showed no significant difference. Seizure duration and the incidence of status epilepticus (SE) showed no significant changes, but SE was more common in the COVID-19-negative group (17.1% vs. 6.2%). The clinical features of FS were similar in both groups. Conclusion: COVID-19 appeared to increase the risk of FS in children, but there was no significant impact on the risk of breakthrough seizures or SE in children with epilepsy. Nevertheless, larger-scale studies are necessary.
최재웅(Jaewoong Choi),윤승재(Seungjae Yun),이경수(Kyongsu Yi) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper presents a development of dynamic programming method for series hybrid bus. Simplified series hybrid bus model is developed for DP (Dynamic Programming) method. DP method is conducted for the simplified series hybrid bus model and Manhattan bus driving cycle. According to the optimal operating, engine charges when the large power is required by driving motor. For typical downtown driving fuel economy, the optimal fuel economy for the series hybrid bus, 3.7km/L, which shows about 85% progress compared to the conventional bus, 2.0km/L.