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차량 능동 현가시스템의 제어 알고리즘 구현 및 실차 성능시험
장효환(H.W.Chang),김주용(J.Y.Kim),정남훈(N.W.Chung),유병철(B.C.Yoo),송동우(D.W.Song) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
In this study, PC Base electronic control unit was constructed for full car test of active suspension system. And sky-hook damping theory, roll and pitch control theory, and PID control theory were applied to a vehicle equipped with active suspension system in order to perform ride quality control, attitude control, and height control.<br/> The performance of ride quality was evaluated through high way ride quality test. The performance of attitude control was evaluated through steady state cornering, step steering, anti-dive, and anti- squat test. Finally height control test which is composed of constant height, height selection, and speed sensing height control was performed.<br/> As a result, through various test, active suspension system showed more excellent ride quality performance in frequency range adjacent to lHz, and more excellent attitude control effect than passive suspension system. Also excellent height control was performed through PCD control.<br/>
Chang Y.Jeong,Jung G.Cho,Ju W.Baek,Du I.Song,Dong W.Yoo 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
A novel zero-voltage-transition (ZVT) isolated PWM boost converter for single stage power factor correction (PFC) is presented to improve the performance of the previously presented ZVT converter[8]. A simple auxiliary circuit which includes only one active switch provides zero-voltage-switching (ZVS) condition to all semiconductor devices. (Two active switches are required for the previous ZVT converter.) This leads to reduced cost and simplified control circuit comparing to the previous ZVT converter. The ZVS is achieved for wide line and load ranges with minimum device voltage and current stresses. Operation principle, control strategy and features of the proposed converter are presented and verified by the experimental results from a 1.5 kW, 100 kHz laboratory prototype.
( Seok-Hwan Kim ),( Myeong Jun Song ),( Jung Hyun Kwon ),( Sun Hong Yoo ),( Soon Woo Nam ),( Hee Yeon Kim ),( Chang Wook Kim ),( Chan Ran You ),( Do Seon Song ),( U Im Chang ),( Jin Mo Yang ),( Sung W 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: To evaluate the efficacy and safety of direct antiviral agents (DAAs) available in chronic kidney disease (CKD) patients with chronic hepatitis C (HCV) in Korea. Methods: In a retrospective, multicenter study involving 8 medical institutions, 362 patients were enrolled from 2015 to 2019. The efficacy and safety of DAAs including glecaprevir/pibrentasvir, sofosubvir/ribavirin, ledipasvir/sofosbuvir, and daclatasvir/ asunaprevir were analyzed for patients according to CKD stage. We evaluated sustained virologic response at week 12 after treatment (SVR12) as primary endpoint. The efficacy and adverse events were also evaluated according to CKD stage. Results: Among 362 patients, 308 patients completed DAA treatment and follow-up period after end of treatment. The subjects comprised 87 patients (62 with CKD stage 3 and 25 with CKD stage 4-5), of whom 22 were undergoing hemodialysis. HCV patients with CKD stage 1 and 2 (eGFR>60) showed SVR12 of 98.1% and 95.5% respectively. SVR12 of CKD stage 3 and 4-5 (eGFR<60) patients was 91.9% and 88% respectively. All patients undergoing hemodialysis achieved SVR12 (90.9%). Treatment failure and cessation of DAAs was 2.7% (3/110) and 0% in stage 1, 2.6% (3/113) and 1.7% (2/113) in stage 2; 1.6% (1/62) and 6.4% (4/62) in stage 3 ; 4% (1/25) and 8% (2/25) in stage 4-5. Conclusions: DAAs shows favorable SVR12 and safety with CKD patients (eGFR< 60) with HCV compared with patients with eGFR >60. The efficacy and safety of DAAs may be related with duration of treatment and concomitant medications. Therefore, it is important to select adequate regimens of DAAs and to treat CKD patients with HCV properly.
장효환(H.W.Chang),송재복(J.B.Song),김병철(B.C.Kim),박병선(B.S.Park),김세윤(S.Y.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
A traction control system(TCS) is the active safety system used to prevent the wheel slipping and thus improve acceleration performance, stability and steerability on slippery roads through the engine torque and/or brake torque control. While most vehicles are equipped with either the engine-based TCS or the brake-based TCS, the engine/brake integrated TCS logic is developed mainly on a simulation basis in this research. The simulation involves not only the actual experimental data on the engine, powertrain and brake systems but also 7-DOF vehicle dynamics along with the nonlinear tire model and driver model. In order to compare the performance of 3 approaches of the TCS, various simulations have been carried ort for the quick start-off 3 approaches of the TCS, various simulations have been carried out for the quick start-off conditions on the split roads. The simulation results show that the engine/brake integrated TCS has better acceleration performance than the engine-based TCS and better steerability that the brake-based TCS.<br/>
장욱(W∞k Chang),송미령(Mi Ryung Song) 한국지역개발학회 2002 韓國地域開發學會誌 Vol.14 No.1
이 글의 목적은 농업과 농촌 발전에 있어 정보통신기술의 역할올 살펴보는 데 있다. 우선, 정보통신기술의 주요 특성을 통해 정보통신기술이 농업과 농촌 발전에 기여할 수 있는 경험적 근거를 파악하고, 둘째, 정보통신기술의 확산과 정보의 활용에 제약으로 작용할 수 있는 도시와 농촌간의 격차와 장애물올 살펴보았다. 특히 이를 위해서는 신경제 (new economy) 의 둥장에 정보통신기술이 기여한 바가 컸다는 미국에서의 경험올 주목하였다. 그리고 셋째, 농업과 농촌 발전에 정보통신기술이 기여할 수 있다는 가정하에 구체화되고 있는 국내의 다양한 시도들올 검토하고 그럽에도 불구하고 관찰되는 도시와 농촌간 정보격차의 현상들올 검토하였다. 끝으로, 정보통신기술의 확산과 정보의 활용이 농업과 농촌 발전에 기여할 수 있기 위해서는 무엇이 선행되어야 할지뜰 고려해 보았다.