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차량 후방 추돌 시 오버라이드/언더라이드 방지를 위한 자세 제어
김동호(Dongho Kim),박영진(Youngjin Park),박윤식(Youn-sik Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Safety systems in intelligent cars are being developed to enhance driving convenience and safety of drivers. These systems are designed to recognize conditions of object cars using radar and vision sensor and have automatic braking function and distance warning function. But aforementioned approaches can’t reduce the damage caused by mismatch of bumper heights when rear-end collisions occur. The proposed control scheme is designed to reduce the crash damage, when unavoidable rear-end collisions occur, by controlling active suspension of vehicle to match bumper heights. The proposed algorithm is a modified control scheme using the optimal finite horizon LQ control and the optimal receding horizon LQ control. In real situation, estimated time to collision may be varying at each sampling time by unpredicted drving conditions of object car and susbject car. The conventional finite horizon LQ control scheme can’t be applied in this sittuation. A new control scheme that can control the desired attitude of vehicle is proposed.
폴리우레탄-실리카 하이브리드 해체성 접착제의 해체접착 특성
김동호(Dongho Kim),김구니(Guni Kim),송경주(Gyeongju Song),정일두(Ildoo Chung) 한국고분자학회 2016 폴리머 Vol.40 No.2
In order to determine the dismantlement property of dismantlable polyurethane adhesive by controlling thermal property, polyurethane (PU)-silica hybrid adhesives with softening properties at a certain temperature were synthesized and used to fabricate dismantlable polyurethane adhesive by mixing with thermally expansive microcapsule. Their thermal properties were characterized by DSC and DMTA, and bonding strength as well as dismantlement properties were also evaluated depending on the type of PU, heating triggers, and treatment conditions. The specimens adhered by dismantlable PU adhesive were readily peeled off after the treatment of microwave irradiation, and those by PU-silica hybrid resin were much more easily peeled off after microwave irradiation for 2 min. This result was attributed to the softening of adhesive and volumetric expansion of thermally expansive microcapsule. In addition, the dismantlable adhesive should have low storage modulus at the expansion temperature of thermally expansive microcapsule to have dismantle adhesion properties.
재개발지역의 통학환경과 색채계획을 중심으로 한 CPTED 연구 - 부산 영도구의 동삼초등학교를 대상으로 -
김동호(Dongho Kim),조정형(Jounghyung Cho) 한국색채학회 2020 한국색채학회 학술대회 Vol.2020 No.5
재개발지역 스쿨존의 셉테드(범죄예방환경디자인, CPTED)과 그에 따른 색채계획은 장기간 소요되는 개발진행과정의 특성 상 지역 슬럼화 우려와 유지, 보수의 어려움이 크다. 부산의 대표적 구도심인 영도구 동삼초등학교는 재개발지역과 인접해 있으며, 주택 밀집지역으로 통학환경이 열악한 대표적인 지역이다. 이러한 측면에서 동삼초등학교 주변현황과 색채환경을 조사하여 통학환경의 범죄예방디자인을 색채적 관점에서 연구할 필요가 있다. 또한, 복잡한 통학로에 대한 시각적 보완을 위한 색채계획의 필요성에 대해 연구하고자 한다.