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[SAFETY 부문] FRONT LONGITUDINAL MEMBER 경량화 설계
이원희(Wonhee Lee),임이제(Yije Lim),김동석(Dongseok Kim),이명석(Myungseok Lee) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, due to concerns about the emission of greenhouse gases, there are increasing interests in the vehicle weight down to reduce fuel consumption and exhaust emissions, particularly CO₂-Substitutions of HSS(High Strength Steels) and TWB(Tailored Welded Blanks) offer an excellent opportunity to reduce vehicle weights and thus the energy required for acceleration. This paper, which is the one pan of High Safety and Light-weight vehicle Developments within the National Project on the Next Generation vehicle, concentrates the light-weight design of Longitudinal member using HSS and TWB and suggests the front end section of Longitudinal member for effective crash energy absorption. This work meets the 20% weight reduction target and maintains the crash performance of the base model.
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코팅 추가에 의한 멤브레인 키보드에서의 고스트-키 검출에 관한 연구
이현창(HyunChang Lee),이명석(MyungSeok Lee) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.7
본 논문에서는 멤브레인 방식 키보드에서 고스트-키를 검출하는 새로운 방법을 제시하였다. 멤브레인 필름에 저항성 도체를 추가로 코팅하는 하드웨어적인 변경을 제시하고, 이때 발생하는 정상-키와 고스트-키에 대한 최적의 검출 저항비에 관해 이론적으로 분석하였다. 저항비는 검출전압 차가 가장 작은 최악의 키 조합에 최적인 비율을 적용하며, 시뮬레이션에 의해 다른 키 조합에 대해서도 이 비율을 적용해 고스트-키를 검출할 수 있음을 보였다. 제시한 방법의 타당성을 입증하기 위해 실험회로를 구성하고 마이크로프로세서의 아날로그-디지털 변환기를 이용해 전압을 추출하였으며, 그 결과에 따르면 정상-키와 고스트-키 사이에 뚜렷한 전압차가 발생해 멤브레인 방식 키보드에서 발생하는 고스트-키를 확실하게 검출할 수 있음을 확인하였다. This paper presents a novel method for detecting a ghost key at the membrane type keyboard, which has additional resistive coating to the membrane film. Also, the optimal ratio of resistances for detecting a ghost key was designed based on the characteristics of the membrane film. The optimal ratio of resistances was considered to be able to detect the worst case (i.e., difference voltage between normal key and ghost key is minimum). The ability of the proposed methods are evaluated by simulation studies in this paper. In order to verify the proposed method, the experiment was carried out with a designed circuit and A/D (analog to digital) in MCU (micro controller unit). The proposed method is implemented into the membrane type keyboard and is verified by experimental results.
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정종홍(Jung Jonghong),김홍종(Kim Hongjong),최영철(Choi Youngchul),이명석(Lee Myungseok) 한국토목섬유학회 2011 한국토목섬유학회 학술발표회 Vol.2011 No.4
The expanded polystyrene(EPS) method is known as representative light-weight embankment countermeasures for road construction on very soft clayey deposits due to its lightness and good engineering properties. This method has been adopted for backfills of bridge since 1991 in Korea. However, long-term performance of EPS embankment after construction and its effect on the pavement above has not been evaluated yet. In the present paper, a case of pavement fatigue above EPS block due to vibration 15 years later after construction, differential settlement at transitionzone of EPS, and fire on EPS were discussed. The deflection at EPS section measured by a series of FWD tests was about 3 times than that of ordinary earthwork zone. A large deflection is regarded as to cause fatigue damage on pavement. It needs to investigate relationship between fatigue damage of pavement and vibration of EPS bock as well as its dynamic characteristics of EPS.
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