A Case Report of Canine Visceral Leishmaniasis, Korea

Bae You Chan,Hyun kyoung Lee,Kyung Hyun Lee,Jae Won Byun,Soon Seek Yoon,Jung Won Park,Myoung Heon Lee,Dae Young Kim,Matti Kiupe,Ingeborg Langohr 대한수의학회 2014 대한수의학회 학술대회발표집 Vol.2014 No.-

표면곡률의 누적히스토그램을 이용한 3차원 얼굴인식

이영학(Yeunghak Lee),배기억(Kiup Bae),이태홍(Taihong Yi) 한국정보과학회 2004 정보과학회논문지 : 소프트웨어 및 응용 Vol.31 No.5

본 논문은 3차원 얼굴 영상으로부터 추출된 얼굴의 부분 영역과 깊이 값에 따른 등고선 영역에 대한 표면 곡률 값들의 누적 히스토그램을 이용한 얼굴인식 알고리즘을 제안한다. 먼저 객체와 배경을 분리하여 얼굴을 추출한 후 얼굴에서 가장 두드러진 형태인 코끝을 찾고, 회전에 대한 정규화를 실시한다. 3차원 얼굴영상이 제공하는 깊이정보와 곡면률을 이용한 표면 특성의 정보를 이용하여 부분영역인 코, 입 그리고 눈의 영역과 등고선 깊이 20, 30 그리고 40의 영역을 추출하여 주 곡률, 평균 곡률 그리고 가우시안 곡률을 이용한 누적 히스토그램으로 특징 벡터를 추출한다. 입력 영상과 데이타베이스 영상과의 유사도 비교를 위해 두 영상에 대하여 L1을 이용하여 비교하였다. 제안된 방법으로 실험을 수행한 결과, 인식률은 주 곡률의 최대 곡률이 96%로 가장 높은 인식률을 나타내었다. A new practical implementation of a facial verification system using cumulative histogram of surface curvatures for the local and contour line areas is proposed, in this paper. The approach works by finding the nose tip that has a protrusion shape on the face. In feature recognition of 3D face images, one has to take into consideration the orientated frontal posture to normalize after extracting face area from the original image. The feature vectors are extracted by using the cumulative histogram which is calculated from the curvature of surface for the contour line areas: 20, 30 and 40, and nose, mouth and eyes regions, which has depth and surface characteristic information. The L1 measure for comparing two feature vectors were used, because it was simple and robust. In the experimental results, the maximum curvature achieved recognition rate of 96% among the proposed methods.

이상적인 강선력 곡선에 의한 강선각 설계기법

차기업,안상태,조창기,최의중,Cha, Kiup,Ahn, Sangtae,Cho, Changki,Choi, Euijung 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.1

Rifling Force can be described with projectile velocity, gas pressure and rifling angle, etc. Under the same conditions, the character of the rifling angle decisively influences the rifling force. To reduce the harmful effect, locally distinct maximum of rifling force has to be avoided. The optimal design methodology of rifling angle curve had been developed by combined Fourier series and polynomial function. When it was tried newly to design the rifling angle curve, this design trial caused not to produce the lower rifling force than the existing design. Normally, the curve of the rifling angle is designed first, then the rifling force is set according to the rifling angle curve. However during the cause analysis, new design methodology was established to design the ideal rifling force curve before the rifling angle design. With this new methodology, the above optimal design method was analyzed and its limitation was confirmed.

단일 및 복합실린더에서 자긴가공 해석에 관한 연구

심우성(Woosung Shin),김재훈(Jaehoon Kim),이영신(Youngshin Lee),차기업(Kiup Cha),홍석균(Sukkyun Hong) 한국추진공학회 2008 한국추진공학회지 Vol.12 No.4

In manufacturing aircraft, safety and lightness of structure are important factors. Utilizing autofrettage technique, these benefits can be obtained. This technique is most frequently applied to a single cylinder. However, the Bauschinger effect reduces the benefits of autofrettage process Therefore, there is increasing interest in the use of compound cylinder that combine shrink fit and autofrettage. In this paper, single and compound cylinders that has same geometry were considered. It was found that compound cylinder which was autofrettaged has lower tangential hoop stress and plastic strain than single cylinder at bore. This means a reduction in the impact of the Bauschinger effect after shrink-fitting which produces the beneficial bore hoop stress.

실험계획법을 적용한 포의 강선 형상최적설계

강대오(Dae-Oh Kang),우윤환(Yoonhwan Woo),차기업(Kiup Cha) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.8

강선설계문제는 실수형 설계변수인 형상변수와 정수형 설계변수인 강선의 개수로 이루어져 있다. 또한, 탄이 강선의 통과하는 거동을 표현하기 위하여 비선형 유한요소 해석을 사용하므로 많은 해석시간이 요구된다. 따라서, 본 연구에서는 실험계획법 기반의 효율적인 강선설계 방법을 제안한다. 첫 번째로, 3 개의 형상변수와 1 개의 정수형 변수를 포함하는 4 개의 설계변수에 대해서 보스의 직교배열표를 사용하여 25 개의 실험점을 생성한 후 각 실험점에 대해서 비선형 유한 요소 해석을 수행한다. 다음으로는 포열에서 탄이 탈출할 때의 탄의 속도와 각속도를 만족시키는 동시에 탄의 저항력을 최소화 하기 위해서 가상설계개념을 수행한다. 제안하는 가상설계개념은 설계 목적과 제약조건 그리고 효과분석을 포함하는 범함수로 생성된다. 마지막으로 가상설계개념으로부터 주어지는 새로운 설계는 초기 설계보다 나은 결과를 보여주고 있다. The rifling design problem has continuous-type shape variables and an integral number of riflings. In addition, it requires considerable time for analysis because its behavior should be described by a nonlinear finite element model (FEM). Therefore, this study presents an efficient design process for rifling based on a design of experiment (DOE) approach. First, Bose’s orthogonal array is used to represent 25 runs for four design variables including three shape variables and one integer variable. Then, nonlinear FE analyses are performed. Next, to minimize the bullet resistance without affecting the bullet velocity and bullet rotational angle immediately before a bullet leaves the gun barrel, a what-if design is performed. In the proposed what-if design, a functional including the design objective and constraints is constructed and effect analysis is performed by using the functional. It is found that the new design obtained from the what-if design shows better results than the current one.

The activation of NLRP3-inflammsome by stimu-lation of diesel exhaust particles in lung tissues from emphysema model and RAW 264.7 cell line

( Soo-taek Uh ),( So My Koo ),( Yangki Kim ),( Kiup Kim ),( Sungwoo Park ),( An Soo Jang ),( Dojin Kim ),( Yong Hoon Kim ),( Choon-sik Park ) 대한내과학회 2017 The Korean Journal of Internal Medicine Vol.32 No.5

Background/Aims: Diesel exhaust particles (DEPs) lead to elevation of reac-tive oxygen species, which can activate the nucleotide-binding oligomerization domain-like receptor (NLR) family members containing the pyrin domain 3 (NLRP₃)-inflammasome. In this study, we elucidated whether NLRP₃ -inflam-masome is activated by DEPs and whether antioxidants (N-acetylcysteine [NAC]) could inhibit such activation. Methods: RAW 264.7 cells and ex vivo lung tissues explants obtained from elas-tase-induced emphysema animal models were stimulated with cigarette smoking extract (CSE), DEPs, and lipopolysaccharide, and levels of interleukin-1β (IL-1β), caspase-1 and nucleotide-binding oligomerization domain-like receptor (NLR) family members containing the pyrin domain (NLRP₃)-inflammasome were as-sessed by Western blotting and immunohistochemistry. Results: NAC and caspase-1 inhibitor suppressed CSE- and DEP-induced secretion of IL-1β in RAW 264.7 cells. The expression levels of the NLRP3-inflammasome and caspase-1 were upregulated in RAW 264.7 cells by stimulation with CSE and DEPs and were inhibited by NAC. CSE and DEPs increased the secretion of IL-1β in lung tissues from both the normal and elastase-induced emphysema groups. The secretion of IL-1β by CSE and DEPs was increased in the elastin-induced em-physema group more than that in the normal group (CSE: 309 ± 19 pg/mL vs. 151 ± 13 pg/mL, respectively, p < 0.05; DEP: 350 ± 24 pg/mL vs. 281 ± 15 pg/mL, respective-ly, p < 0.05). NAC inhibited CSE- and DEP-induced IL-1β secretion in both the nor-mal and elastase-induced emphysema groups. NLRP₃-inflammasome expression as determined by immunohistochemistry was increased by CSE and DEPs in both the normal and elastin-induced emphysema groups, and was suppressed by NAC. Conclusions: The NLRP₃-inflammasome is activated by DEPs in ex vivo tissue explants from elastase-induced emphysema animal model, and this activation is inhibited by NAC.

ER 유체를 이용한 회전식 약실 축계의 비틀림 진동 제어

임승철(Seungchul Lim),김기갑(Kikap Kim),길성진(Seongjin Kil),심정수(Jeongsoo Shim),차기업(Kiup Cha) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.1

간헐 회전식 약실 계가 화력 대 무장 공간의 비율 관점에서 볼 때 중구경 자동포에 크게 유익하다고 보고되었다. 그러나 약실계의 핵심 부품인 평행 인덱스가 인덱스 터릿에 설치되는 캠종동절의 상대적으로 낮은 횡 강성으로 인하여 비틀림 방향으로 유연해지는 경향이 있으며, 이는 결국 터릿과 약실 사이의 연결 축이 상당한 크기의 비틀림 잔류 진동에 노출되어 탄 장전과 발사 시에 심각한 비정렬 문제를 야기시킬 수 있다. 이러한 맥락에서 본 논문에서는 상기 진동을 억제하는 ER유체 작동기와 그에 적합한 반능동 제어 알고리듬을 제안하게 되었으며, 전체 계의 수학적 모델링과 컴퓨터 시뮬레이션을 통하여 그 성능이 만족스러움을 입증하였다. It is reported that an intermittently rotating chamber system will improve the ratio of firepower to armament space in the case of mid-calibre automatic guns. However, the parallel index, which is a main component of the system, tends to be torsionally flexible due to the low lateral stiffness of cam followers on the index turret. This may cause the shaft system connecting the turret with the chamber prone to considerable residual torsional vibration so that serious misalignment problems occur during ammunition loading and firing processes. Herein, an electrorhelogical (ER) fluid actuator that can suppress such vibrations and the associated semiactive control algorithm are proposed. By mathematical modeling and computer simulations, the performance of the entire system is proved satisfactory.

자긴가공된 SCM440 고강도강의 잔류응력평가에 관한 연구

김재훈(Jaehoon Kim),심우성(Woosung Shim),윤용근(Youngkwen Yoon),이영신(Youngshin Lee),차기업(Kiup Cha),홍석균(Suckkyun Hong) 한국추진공학회 2010 한국추진공학회지 Vol.14 No.4

Thick-walled cylinders, such as a cannon or nuclear reactor, are autofrettaged to induce advantageous residual stresses into pressure vessels and to increase operating pressure and the fatigue lifetimes. As the autofrettage level increases, the magnitude of compressive residual stress at the bore also increases. The purpose of the present paper is to predict the accurate residual stress of SCM440 high strength steel using the Kendall model which was adopted by ASME Code. Hydraulic pressure process was applied in the inner part and thick-walled cylinders were autofrettaged up to 30% overstrain levels. Electro polishing on the surface of autofrettage specimen was performed to get more accurate residual stress. Residual stresses were measured by X-ray diffraction method. The autofrettage surface which was plastically deformed analyzed using a scanning electron microscope(SEM). Although there were some differences in measured residual stress and numerical results, it has a tendency to agree comparatively with each other.