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김진우,박종환,김진구,김훈,Kim, Jin-Woo,Park, Jong-Hwan,Kim, Jin-Gu,Kim, Hoon 한국조명전기설비학회 2003 조명·전기설비학회논문지 Vol.17 No.2
기존의 2차원 설계법을 이용하여 3차원 압출성형 HID 경면 반사판형상 설계에 적용할 수 있는 3차원 설계법을 개발하였다. 이 설계법을 적용하여 터널용 HID 조명기구의 반사판 형상을 설계하고 그 성능을 예측하였다. Using pervious two-dimensional reflector design method, the three-dimensional reflector design method is developed for extrusion molding HID specular reflector optical design, Using this method, a HID reflector for tunnel was developed and estimated its performance.
철근콘크리트 깊은 보의 현행 스트럿-타이 설계기준에 대한 비교 및 평가
김진우,홍성걸,이영학,김희철,김대진,Kim, Jin Woo,Hong, Sung-Gul,Lee, Young Hak,Kim, Heecheul,Kim, Dae-Jin 한국전산구조공학회 2014 한국전산구조공학회논문집 Vol.27 No.4
콘크리트 깊은 보의 전단강도 산정을 위해 현행 미국콘크리트학회(ACI) 및 캐나다표준규격협회(CSA), 유럽콘크리트위원회(CEB-FIP)의 설계기준은 스트럿-타이 모델을 이용할 것을 제안하고 있지만 설계의 품질이 설계자가 구성한 트러스 모델 적합성에 크게 좌우된다는 특징을 가지고 있다. 따라서 본 논문에서는 내부 트러스 모델에 따른 현행 ACI, CSA 및 CEB-FIP의 콘크리트 깊은 보 설계기준의 타당성을 홍성걸 등에 의해 제안된 콘크리트 소성학에 근거한 전단강도식의 예측치와 비교함으로써 평가한다. 비교 결과 ACI, CSA 및 CEB-FIP의 스트럿-타이 모델에 의해 설계된 깊은 보의 경우 내부 트러스 모델이 전단강도 예측에 중요한 영향을 미치는 것으로 나타났으며 CEB-FIP의 경우 가장 높은 스트럿 강도 예측치를 보였다. The current American Concrete Institute(ACI), Canadian Standard Associate(CSA) and CEB-FIP Model Code 2010 provisions on the shear strength of a simply supported deep beam suggest that deep beams should be designed using the strut-and-tie model. Although this is a useful methodology to design members in disturbed regions, the quality of the design is highly dependent on the truss model that designers create. However, Hong et al. derived the shear strength equations of reinforced concrete deep beams. This thesis investigates the validity of the current ACI, CSA and CEB-FIP code provisions on the shear strength of simply supported reinforced concrete deep beams by comparing them with the shear strength equations proposed by Hong et al. The comparison shows that all of these code provisions provide reasonable estimates on the shear strength of concrete deep beam members and the selection of an internal truss model plays an important role on the estimation of shear strength.
미세구조 제어를 통한 (Nd,Dy)-Fe-B 소결자석의 보자력 증가
김진우,김세훈,김영도,Kim, Jin-Woo,Kim, Se-Hoon,Kim, Young-Do 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.1
Sintered Nd-Fe-B magnets are widely used in many fields such as motors, generators, actuators, microwaves and so on due to their excellent magnetic properties. Many researchers have shown that the Nd-rich phase was essentially important for high magnet properties. In this study, we focused on controlling of the Nd-rich phase to enhance magnetic properties by the cyclic sintering process. Nd-Fe-B based sintered magnets were prepared by isothermal sintering and cyclic sintering processes. Magnetic properties and microstructure of the magnets were investigated. The coercivity was enhanced from 21.2 kOe to 23.27 kOe after 10 cycles of the sintering. The Nd-rich phase was effectively penetrated into the grain boundary between the $Nd_2Fe_{14}B$ grains by the cyclic sintering.
셀룰로오스 아세테이트로 표면화학개질된 PAN 섬유의 특성
김진우,이상민,오영세,Kim, Jin-U,Lee, Sang-Min,O, Yeong-Se 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.6
The fibers containing primary amino groups were prepared by reacting PAN fiber with ethylene diamine (EDA). This aminated PAN fibers was finally modified with cellulose acetate (CA) in the presence of hexamethylene diisocyanate (HDI) as binder The amine content of PAN fibers was 0.012∼0.327 meq/g, and the maximum amice content of PAN fibers was obtained after 18 hrs of amination. The finally modified PAN fibers contained less than leyc of CA. The storage modulus of final PAN fiber in glassy state was decreased, but increased in rubbery state after modification. As EDA and CA was introduced Into PAN fibers, Tg's were slightly shifted to lower temperature. In the SEM micrographs the surface of aminated PAN fibers became coarse, but the surface of the final PAN fibers containing CA did smoother than that of original fiber. The modification enhanced the Young's modulus of PAN fiber. While the aminated PAN fiber showed stress-hardening behavior at large deformation, the final PAN fiber modified with CA did low yield behavior as well as thermoplastic deformation.
지혜 깊어지는 건강: 우리 아이를 위한 1분 건강 -굿바이 아토피 피부염 치료법은 없을까?
김진우,Kim, Jin-U 한국건강관리협회 2011 건강소식 Vol.35 No.4
살랑살랑 불어오는 봄바람은 아토피 피부염에는 가장 큰 적이다. 소아기의 아토피 피부염은 손이나 발목이 접히는 부위의 피부가 건조하고 두꺼워지는 것으로 나타나다. 그리고 눈주위의 홍반, 귀 주위의 피부 균열, 손이나 발의 습진도 흔하게 생긴다.
ESS 배터리 충방전 시스템을 위한 8kW급 LLC 절연형 컨버터 설계
김진우,백승훈,조영훈,구태근,Kim, Jinwoo,Baek, Seunghoon,Cho, Younghoon,Koo, Tae-Geun 전력전자학회 2018 전력전자학회 논문지 Vol.23 No.3
In battery-operated systems, an isolated converter is used to interface the utility grid with the system to increase stability when charging and discharging batteries. Systems such as vehicle-to-grids (V2Gs), on-board chargers, and energy storage systems (ESSs) have recently become popular, and the roles of isolated converters have become important considerations in fabricating such devices. A fixed-frequency LLC converter, which is a type of isolated converter, presents the advantages of high efficiency and high power density by performing zero-voltage switching (ZVS) over wide frequency ranges. However, the magnetizing inductance of the LLC converter should be designed to enable ZVS in all switching devices. Therefore, in this study, the operating characteristics of the LLC circuit are analyzed, and an optimal design method for ZVS operation is established. Moreover, an 8 kW LLC high-efficiency and high-power-density resonant converter is designed and tested for ESS application. The LLC converter achieves 98% efficiency at rated power.