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자동차(自動車) 번호표(番號標)(보통 번호표(番號標)) 숫자(數字)의 가독성(可讀性)에 대한 연구(硏究)
백승엽,조암,Baek, Seung-Yeop,Jo, Am 대한인간공학회 1988 大韓人間工學會誌 Vol.7 No.1
The purpose of this study is to provide basic research data on the readability of the car number license plate in Korea by experimental procedure. This study is performed by the combination of color contrasts, character forms, and stroke widths. Additionally it is focused on the distance of distinct vision and misreading rate. The results of the this study are as follows: First, as to the color contrasts, the plate which has black on yellow contrast has better readability than current contrast between white and green (white character on green plate, vice versa). Second, as the character forms, it is showed that Quasigothic and NAMEL types have less misreading rates by 42.86% and 42.15%, respectively, than current Gothic type, and they also increase distance of distant vision by 4 meter. Third, as to the stroke widths, it is showed that 12 milli-meter and 14 milli-meter of stroke widths have less misreading rates by 63.94% and 65.33 %, respectively, than current 6 milli-meter of stroke width.
S20C 리벳된 Al5052와 SPFC980Y 강철 resistance-element 점용접 접합부의 미세조직 발달 및 고강도-부식 저항 특성
백승엽(Seung-Yeop Baek),송종호(Jong-Ho Song),박승연(Seung-Youn Park),송일종(Il-Jong Song),이현철(Hyun-Chul Lee) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.2
이 연구는 electric resistance element spot welding 프로세스를 도입하여 알루미늄 합금-강철의 이종 접합부의 기계적 강도 및 내식성을 향상시키기 위해 수행되었다. SPFC980Y 강철과 Al5052-H32가 각각 모재로써 적용되었고, S20C 강철은 리벳 element로써 음각과 양각의 형상으로 구분되며, Al5052-H32에 전기 저항 스폿 용접을 위해 리벳팅 되어 6.5 kA의 전류와 250 kgf/cm²의 가압력으로 접합되었다. 그 결과, 음각된 S20C element는 스폿 용접공정 후 불안정한 너깃이 형성되는 반면, 양각된 S20C의 경우, 구조적으로 건전한 접합부로 건전한 내식성 및 탁월한 기계적 특성이 얻어졌다. FEM 시뮬레이션의 도입으로, 음각과 양각의 계면의 접합 특성이 수치적으로 밝혀졌으며, 시뮬레이션 결과는 미세조직 발달 양상을 수치적으로 뒷받침하였다. 이 연구는 element 스폿 용접된 H32-A5052 이종 접합부의 기계적 강도 및 부식 신뢰성에 대해 체계적으로 분석되었으며, 이 공정은 금속재료뿐만 아니라, 경량 비전도성 비철/비금속계 재료에도 적용 될 수 있기 때문에, 차세대 차체 경량화의 양산 기술로 확장 될 수 있다. This study examined the mechanical strength and corrosion resistance of a dissimilar joint with an aluminum alloy and steel by resistance element spot welding. SPFC980 steels and Al5052 alloys were applied as the base materials. S20C steels were assembled on Al5052 for the riveting element before the electric resistance welding process. The SPFC980-S20C riveted Al5052 was welded at a 6.5 kA current and 250 kgf/cm². As a result, the engraved S20C elements formed unstable nuggets after the spot welding processes. In contrast, in the embossed S20C elements, exceptional mechanical properties, such as robust corrosion resistance and fatigue resistance, were obtained by structurally sound joints. The correlation between the microstructure and mechanical properties were examined by microstructural investigations and FEM simulations. The corrosion reliability of element spot-welded SPFC980-Al5052 dissimilar joints was investigated systematically.
백승엽(Seung Yeop Baek),박정하(Jung Ha Park),박진철(Jin Chul Park) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.11
The aim of this study was to evaluate on the energy savings when applying atrium in the super high-rise building, and the research results can be summarized as follows. Lower part (A Zone) and the upper floors (B Zone) of the heating and cooling load was calculated. at existing buildings and atrium-applied building, and as a result, When applying atrium in the super high-rise building, cooling load at Lower part (A Zone) was resuced by 10.9%, and heating load was by 12.5% . but, at Upper part (B Zone), peak heating load was increased by 9.8%. while peak cooling load decreased by 3.2%. It was judged that applying atrium in the High-rise buildings can reduce the energy, but it should be planned appropriate level at the lower levels with active systems.