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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.
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.
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.
김진우,Jong-Myeong Kim,Kwang Wook Min,You-Joung Kim,Ron Smits,Konrad Basler 한국분자세포생물학회 2023 Molecules and cells Vol.46 No.7
β-Catenin (Ctnnb1) has been shown to play critical roles in the development and maintenance of epithelial cells, including the retinal pigment epithelium (RPE). Ctnnb1 is not only a component of intercellular junctions in the epithelium, it also functions as a transcriptional regulator in the Wnt signaling pathway. To identify which of its functional modalities is critically involved in mouse RPE development and maintenance, we varied Ctnnb1 gene content and activity in mouse RPE lineage cells and tested their impacts on mouse eye development. We found that a Ctnnb1 double mutant (Ctnnb1dm), which exhibits impaired transcriptional activity, could not replace Ctnnb1 in the RPE, whereas Ctnnb1Y654E, which has reduced affinity for the junctions, could do so. Expression of the constitutively active Ctnnb1∆ex3 mutant also suppressed the development of RPE, instead facilitating a ciliary cell fate. However, the post-mitotic or mature RPE was insensitive to the loss, inactivation, or constitutive activation of Ctnnb1. Collectively, our results suggest that Ctnnb1 should be maintained within an optimal range to specify RPE through transcriptional regulation of Wnt target genes in the optic neuroepithelium.
Optical flow of heart images by image-flow conservation equation and functional expansion
김진우,Kim, Jin-Woo The Korea Institute of Information and Commucation 2007 한국정보통신학회논문지 Vol.11 No.7
기존의 광류 (Optical flow)는 국소적 처리를 시작점으로 하는 bottom-up수법에 의해서 구하였다. 이에 반해, 본 논문은 영상유체보존식과 함수 전개법에 의해 영상 전체의 움직임을 차수가 낮은 모드로 부터 순차적으로 전개하는 bottom-down수법을 새로운 수법으로 제안한다. 의료 영상에 있어서 명도는 움직임이 있어도 불변으로 유지하려는 경우가 많다. 그러나 이 같은 영상계열에서의 움직임은 좌표 변환에 의해서 대응된다. 본 수법의 경우 광류는 선형모멘트방정식의 함수에 관한 도함수를 이용하는 투영법에 의해서 반복계산으로 구하여 진다. 본 논문에서는 심장의 영상계열을 이용하여 기존의 Horn and Schunck기법, Standard multigrid기법과 본 수법의 알고리즘을 비교 평가하여 유효성을 나타낸다. The displacement field (Optical flow) has been calculated by bottom-up approaches based on local processing. In contrast with them, in this paper, a top-down approach based on expanding in turn from the lowest order mode the whole motion in an image pair of sequential images is proposed. The intensity of medical images usually represents a quantity which is conserved during the motion. Hence sequential images are ideally related by a coordinate transformation. The displacement field can be determined from the generalized moments of the two images. The equations which transform arbitrary generalized moments from a source image to a target image are expressed as a function of the displacement field. The appareent displacement field is then computed iteratively by a projection method which utilizes the functional derivatives of the linearized moment equations. This method is demonstrated using a pair of sequential heart images. For comparative evaluation, we applied Horn and Schunck's method, a standard multigrid method, and our proposed algorithm to sequential image.
Experimental Study on the Tensile Behavior of Interlocks on U-Type Section Steel Piling
김진우,HaeYong Park,TaeHoon Kim,TaeSoo Kim 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.5
Sheet piles are used in various construction field applications, such as retaining walls, slope reinforcement, breakwaters, and ports, owing to their excellent strength, light weight, waterproofing, durability, and workability. The U-type section steel piling, which is a type of sheet pile, is composed of hollow trapezoidal sections with interlocks at both ends. At the construction site, a structure is formed by assembling the interlocks of each cross-section in a simple fitting type using the driving or indentation method. Interlock is an important part of connecting steel sheet piles. The shape, size, and steel type in the interlock affect the connection quality and structural performance of the structure. In this study, tensile tests were performed on test specimens connected in series in a simple fitting type for the interlock, which is an important component of the U-type section steel piling. It was observed that the load–displacement relationship temporarily decreased and then increased. In addition, formula for calculating the maximum strength of interlock was discussed and the predictions were compared with the experimental results, and the high consistency of the formula was verified.
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.