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실차 엔진에 적용 가능한 이중 질량 플라이휠의 변위 측정 시스템 개발
이호현(Hohyun Lee),고상근(S. Ken Kauh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The Dual Mass Flywheel (DMF) is used in many modem vehicles to decrease noise and absorb vibration on the move. By the two decoupled masses of the flywheel are linked by spring dampers, torsional vibration can be reduced. The measurement of angular displacement of DMF is very important to analysis power transmission characteristics between the engine and the transmission. To get the real time displacement data of DMF, sensor based on the principle of LVDT is mounted on rotating flywheel. The power for circuit is supplied using a method of electromagnetic induction. In addition Bluetooth technology is used for wireless data transmission.
이호현(Ho-Hyun Lee),장상복(Sang-Bok Jang),홍성택(Sung-Taek Hong),전명근(Myung-Geun Chun) 한국지능시스템학회 2014 한국지능시스템학회논문지 Vol.24 No.2
본 논문에서는 발암물질 저감을 위하여 정수장 염소투입공정 중 전염소 주입에 따른 침전지의 염소 증발량이 주야간, 계절별 현격한 차이가 발생함에 따라 시간대별/계절별/날씨별 유입목표 잔류염소를 변경하고자 운영자의 경험에 기반한 퍼지 모델링 기법을 도입하였다. 퍼지에 의해 설정된 목표 잔류염소농도를 유지하기 위하여 침전지 유입부에 잔류염소 계측기를 추가 설치하여 피드백 Loop 시간을 최소화하였고 지연시간이 긴 시스템에 적용되는 이중 피드백 제어시스템인 캐스 케이드 제어를 병행 실시하였다. 이를 통해 소독공정의 고유특성인 시간지연에 대한 선제적 대응 및 침전지 잔류염소농도 변화폭을 7.3배가량 안정화를 시키고 염소소모량을 저감하여 안정적이고 경제적인 물 공급이 가능하도록 하였다. In this study, chlorine modeling technique based on fuzzy system is proposed to reduce the carcinogenic substance and decide the optimal chlorine injection rate, which is affected by chlorine evaporation rate in sedimentation basin according to detention time, weather and water quality. The additional chlorine meter is installed in the inlet part of sedimentation to reduce the feedback time and implement cascade control, which leads to maintaining the residual chlorine concentration decided by fuzzy rule. It helps to take a preemptive action about long time delay, the characteristics of the disinfection process, and reduce the variation of residual chlorine rate by 7.3 times and the chlorine consumption by 40,000 dollars. It made a significant contribution to supply hygienically safe drinking water.
이호정 ( Ho Jung Lee ),홍정연 ( Jeong Yeon Hong ),박태흠 ( Tae Heum Park ),이성열 ( Sung Yul Lee ),이종석 ( Jong Suk Lee ),정의현 ( Euy Hyun Chung ),이상훈 ( Sang Hoon Lee ),김정은 ( Jung Eun Kim ) 대한피부과학회 2020 대한피부과학회지 Vol.58 No.6
Fixed drug eruption (FDE) is a drug-induced disorder that may appear as patches or bullae. It recurs at the same sites as those involved in exposure to the same drug (causative drug). We encountered two cases of generalized FDE, and both patients had a history of diclofenac exposure before the onset of skin lesions. In the first case, an 82-year-old female patient presented with multiple erythematous patches on the trunk and lower extremities. In the second case, a 71-year-old male patient developed multiple bullae on violaceous patches on the trunk and extremities. The findings of histopathologic examinations were indicative of the diagnosis of FDEs. Although diclofenac is commonly used as a non-steroidal inflammatory drug, diclofenac-induced generalized FDE occurs rarely and has not been reported in Korea. With reuse of causative drugs, the size and number of lesions tend to increase. Therefore, early diagnosis of FDE is important, and avoidance of repeated exposure to drugs should be educated