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김민식(Minsik Kim),권지원(Jiwon Kwon),강준영(Junyoung Kang),이진욱(Jinwook Lee),김승열(Sunglyul Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, particle number concentration emitted by diesel internal combustion engine has focused on attention because the nano-sized particles are suspected being hazardous of air pollution as well as human body. In this study, by using the PPS (Pegasor Particle Sensor) system which can measure nano-particle from engine-out emissions, it is investigated the particle emission characteristic at various diesel engine-operating conditions. The PPS system operates by electro-statically charging particles passing through its body and then measuring the current produced by the charged particles as they leave the sensor. The particles are charged by ions generated by a corona discharge, which is generated around a sharp tip at high voltage. Under the steady state operation of the 2.0L CRDi diesel engine with different operating condition (1000,1500,2000 rpm), the nano-sized particle emission characteristic was measured at the downstream position of DOC system. According to this experiment result, more engine load increases, more particle concentration increases. Also, it has slowly become after installizing DOC.
김민식(Minsik Kim),배주찬(Joochan Bae),김동건(Donggeon Kim) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
본 연구에서는 외부하중을 고려하여 Fulton과 Vasiliev가 제안한 돔형상 식을 적용하여 복합재 압력용기의 돔형상을 설계하고 해석하였다. 돔형상 설계변수로는 0.1 ~ 0.5 의 오프닝 반경비와 40kN ~ 200kN의 추력을 적용하고, 해석에는 상용 유한요소해석 프로그램인 ABAQUS를 사용하였다. 복합재 압력용기 내면과 외면의 섬유방향 변형률을 계산한 결과, Fulton 돔의 경우 ρ0가 커질수록 변형률 기울기가 작아지고, Vasiliev 돔은 뚜렷한 경향성이 나타나지 않는다. 또한 ρ0 ≤ 0.1 일 경우 모든 추력에서 Fulton 돔이 변형률 기울기가 더 큰 것을 확인 할 수 있었다. 0.1< ρ0 < 0.35 인 경우 주어진 추력 범위에서 변형률 기울기가 역전되는 형상을 보이며, 0.35 ≤ ρ0 에서는 모든 구역에서 Vasiliev 돔이 변형률 기울기가 더 크게 나타나 압력용기의 설계에 적용하는 것이 효과적이라고 판단된다. 또한 복합재 압력용기의 변형률 기울기로 인해 발생하는 수지균열을 고려한 돔형상 설계가 필수적이다. In this study, we perform the design of dome geometry for the composite pressure vessel with applying the equation of Fulton and Vasiliev considering external load(thrusts). Variables of the dome geometry are opening radius ratio(ρ0) from 0.1 to 0.5 and thrust level from 40kN to 200kN. We conduct Finite Element Analysis(FEA) by using ABAQUS. As a result, the strain of the composite pressure vessel has shown strain gradient from inner to outer of dome surface. And the strain gradient may cause crack of resin inside the composite laminate. Strain gradient of Fulton dome is monotonously decreased as the ρ0 increases, but the strain gradient of Vasiliev dome bas shown some different trend. when ρ0 ≤ 0.1, strain gradient of Fulton’s is higher than Vasiliev’s. But when 0.1 < ρ0≤ 0.35, strain gradient of Vasiliev’s becomes higher than Fulton’s. And in the case of 0.35 ≤ ρ0, strain gradient of Vasiliev’s is higher than Fulton’s. So the Vasiliev dome is more effective in ρ0 ≤ 0.1 condition and Fulton dome is more effective in 0.35 ≤ ρ0 condition. So, it’s important for dome design to consider the crack of resin cause of the strain gradient.
인공지능 표정 인식 기술을 활용한 사용자 감정 맞춤 힐링·광고 서비스
김민식 ( Minsik Kim ),정현우 ( Hyeon-woo Jeong ),문윤지 ( Yoonji Moon ),문재현 ( Jaehyun Moon ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.2
DOOH(Degital Out of Home) advertisement market is developing steadily, and the case of use is also increasing, In advertisement market, personalized services is actively being provided with technological development. On the other hand, personalized services are difficult to be provided in DOOH and are provided by only personal information, not feelings. This study aims to construct personalized DOOH services by using AI facial expression recognition and suggesting a solution optimized for interaction between user and services by providing healing and advertisement.