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김종형 ( Jong Hyung Kim ),오지선 ( Ji Seon Oh ),김동민 ( Dong Min Kim ),허성재 ( Seong Jae Huh ),임경훈 ( Kyung Hun Lim ),도기원 ( Gi Won Do ),홍순형 ( Soon Hyung Hong ),최승원 ( Seung Won Choi ) 대한류마티스학회 2010 대한류마티스학회지 Vol.17 No.1
Periorbital edema is a rare manifestation of systemic lupus erythematosus (SLE). We describe here a patient with bilateral periorbital edema as a presenting symptom of SLE. A 23-year-old woman was admitted for a sudden onset of severe periorbital edema that developed 7 days previously. On the basis of the malar rash, arthritis of the right hand and left wrist, leukopenia, proteinuria and the positive anti-nuclear and anti-dsDNA antibodies, she was diagnosed with SLE. Kidney biopsy revealed lupus nephritis (WHO class IV). After treatment with high dose of steroids, intravenous cyclophosphamide and daily hydroxychloroquine, her symptoms resolved, including the periorbital edema. She was discharged with prescriptions for prednisolone and hydroxychloroquine and she remains well.
김종형(Jong Hyeong Kim),Chanh D. Tr. Nguyen 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.11
Shape recognition of solder ball bumps in a BGA (Ball Grid Array) is an important issue in flip chip bonding technology. In particular, the semiconductor industry has required faster and more accurate inspection of micron-size solder bumps in flip chip bonding as the density of balls has increased dramatically. The difficulty of this issue comes from specular reflection on the metal ball. Shape recognition of a metal ball is a very realproblem for computer vision systems. Specular reflection of the metal ball appears, disappears, or changes its image abruptly due to tiny movementson behalf of the viewer. This paper presents a practical shape recognition method for three dimensional (3-D) inspection of a BGA using a 5-step ring illumination device. When the ring light illuminates the balls, distinctive specularity images of the balls, which are referred to as“iso-slope contours” in this paper, are shown. By using a mathematical reflectance model, we can drive the 3-D shape information of the ball in aquantitative manner. The experimental results show the usefulness of the method for industrial application in terms of time and accuracy.
DLC 코팅된 60E1(UIC60) 강의 건조 마찰에서의 미끄럼 마찰 거동
김종형(Jong-Hyoung Kim),정재일(Jae-Il Jeong),김재원(Jae-Won Kim),김태규(Tae-Gyu Kim),Chau Kian Hao,Willey Y. H. Liew,김석삼(Seock-Sam Kim) 대한기계학회 2020 大韓機械學會論文集A Vol.44 No.2
본 논문은 철도 레일용으로 사용되는 60E1 강 표면에 RF-PECVD 방법으로 Si-doped DLC 코팅과 non-doped DLC 코팅을 제작하여 ball-on-disk형 마찰시험기로 실험을 수행하고 DLC 코팅층의 경도와 마찰 특성을 평가하였다. 시험 결과, Si-doped DLC 코팅층의 경도가 non-doped DLC 코팅층보다 높게 나타났으며 마찰 계수는 낮게 나타났다. SEM 사진의 미시적 마찰면의 관찰 결과, non-doped DLC면에는 표면균열과 응착에 의한 마찰면이 관찰되었고, Si-doped DLC의 마찰면은 응착 유동에 의한 응착과 이착이 주된 마찰 메카니즘이었다. In this study, the nano-hardness and frictional behavior of non-doped DLC (diamond-like carbon) and Sidoped DLC coated 60E1 steel deposited by RF-PECVD method were investigated. The results showed that Si-doped DLC exhibited higher nano-hardness and lower friction coefficient than the non-doped DLC from ball-on-disk type tribometer. By using SEM (scanning electron microscope), SEM images showed friction mechanism of the base material was adhesion and that of DLC showed adhesion and brittle fracture. owever, Si-doped DLC showed adhesion friction and transfer layer of DLC to counterpart.
다구찌 실험 계획법을 이용한 광통신용 지르코니아(ZrO₂) 페룰의 연삭조건 최적화 실험
김종형(Kim Jong-Hyong),서창민(Suh Chang-Min),채정식(Chae Jung-Sik) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In this paper, the effects of grinding conditions on the surface roughness of ZrO₂ ferrule applying to the optical fiber connector were investigated. The mesh number of grindstone, the grinding speed and the time schedule during grinding were regarded as main cutting parameters that have an effect on the surface roughness. And then, optimal combinations for chamfering grinding were obtained by using the Taguchi method. In addition, analytic values for maximum surface roughness (R<SUB>max</SUB>) estimated by the theoretical equations which were derived from the formative model of surface roughness on the chamfering grinding were compared with those of the experiments.