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이정은,함효주,이관용,노지웅,유진석,정우백 이화여자대학교 의과학연구소 2014 EMJ (Ewha medical journal) Vol.37 No.2
Early repolarization is a common electrocardiographic (ECG) feature found in young adults, men and athletes, and has been considered to be a benign feature for the last several decades. But recent studies suggest that early repolarization may be related to idiopathic ventricular fibrillation and sudden cardiac death. We report a young man, 35 years old, who had life threatening ventricular fibrillation and sudden cardiac arrest. He was evaluated for cardiac causes of ventricular fibrillation. There was no explanation other than that his ECG showed an early repolarization pattern so we treated him with implantable cardioverter defibrillator. Thus, we suggest that early repolarization may be related with life threatening ventricular arrhythmia.
Ji, Yong-Sok,Park, Jung-Won,Heo, Hwan,Park, Jong-Seong,Park, Sang-Woo Informa Healthcare USA, Inc. 2014 Current eye research Vol.39 No.6
<P><I>Purpose:</I> To investigate whether carnosine can increase retinal ganglion cell (RGC) survival in ischemic mouse retina.</P><P><I>Methods:</I> Retinal ischemia was induced by constant elevation of intraocular pressure (100-110 mmHg) for 60 min in C57BL/6 J mice pretreated with carnosine (1000 mg/kg) or saline. Hypoxia inducing factor-1 alpha (HIF-1α), glial fibrillary acidic protein (GFAP), and dynamin-related protein-1 (Drp-1) expressions were assessed at 6, 12, and 24 h after retinal ischemia. Bax and Bcl-2 expressions were also analyzed at 12 h after retinal ischemia. RGC survival was assessed by retrograde FluoroGold labeling at 2 weeks after retinal ischemia.</P><P><I>Results:</I> The expression of HIF-1α, GFAP, and Drp-1 was increased within 24 h after ischemic injury. Carnosine treatment effectively decreased the elevated expression of HIF-1α, GFAP, and Drp-1 in ischemic mouse retina. In ischemic retina treated with carnosine, Bax expression was decreased, whereas Bcl-2 expression was increased compared with ischemic retina treated with saline. Carnosine treatment also protected against RGC loss in ischemia mouse retina.</P><P><I>Conclusions:</I> Our findings showed that carnosine treatment significantly decreased RGC loss through decreased expression of HIF-1α, GFAP, Drp-1, and Bax, and increased expression of Bcl-2 in ischemic mouse retina. We suggest that carnosine can be an effective endogenous neuroprotective molecule in the prevention of RGC loss in ischemic retina.</P>
스테로이드 단기투여로 신속히 호전된 대상포진 환자의 안구 외전 마비
노용관 ( Yong Kwan Rho ),이진웅 ( Jin Woong Lee ),김지영 ( Ji Young Kim ),이갑석 ( Kap Sok Li ),서성준 ( Seong Joon Seo ),홍창권 ( Chang Kwun Hong ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.10
Herpes zoster ophthalmicus involving the first division of the fifth cranial nerve produces various clinical manifestations. Among them, external ocular motor palsy is a rare and uncomfortable complication, but it is generally transient and self-limited. This palsy can have a neural, vascular ormuscle origin. We report here on a case of ocular abduction palsy in a patient with herpes zoster ophthalmicus, and this palsy cleared up after treatment with systemic steroid for two weeks. (Korean J Dermatol 2008;46(10):1395∼1397)
The Novel Biological Action of Antimicrobial Peptides via Apoptosis Induction
( Jae Yong Cho ),( In Sok Hwang ),( Hyemin Choi ),( Ji Hong Hwang ),( Jae Sam Hwang ),( Dong Gun Lee ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.11
Antimicrobial peptides (AMPs) exert antimicrobial activity against Gram-positive and Gram-negative bacteria, fungi, and viruses by various mechanisms. AMPs commonly possess particular characteristics by harboring cationic and amphipathic structures and binding to cell membranes, resulting in the leakage of essential cell contents by forming pores or disturbing lipid organization. These membrane disruptive mechanisms of AMPs are possible to explain according to the various structure forming pores in the membrane. Some AMPs inhibit DNA and/or RNA synthesis as well as apoptosis induction by reactive oxygen species (ROS) accumulation and mitochondrial dysfunction. Specifically, mitochondria play a major role in the apoptotic pathway. During apoptosis induced by AMPs, cells undergo cytochrome c release, caspase activation, phosphatidylserine externalization, plasma or mitochondrial membrane depolarization, DNA and nuclei damage, cell shrinkage, apoptotic body formation, and membrane blebbing. Even AMPs, which have been reported to exert membrane-active mechanisms, induce apoptosis in yeast. These phenomena were also discovered in tumor cells treated with AMPs. The apoptosis mechanism of AMPs is available for various therapeutics such as antibiotics for antibiotic-resistant pathogens that resist to the membrane active mechanism, and antitumor agents with selectivity to tumor cells.
노용관 ( Yong Kwan Rho ),유광호 ( Kwang Ho Yoo ),김지영 ( Ji Young Kim ),이갑석 ( Kap Sok Li ),서성준 ( Seong Joon Seo ),홍창권 ( Chang Kwun Hong ),송계용 ( Kye Yong Song ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.1
Epidermal nevi are harmatormas that are the result of developmental malformations of the epidermis, and these lesions present with a variety of clinical and histological characteristics. Some tumors can arise in epidermal nevi because epidermal nevi develop from multipotent germinative cells. We report here on a 57-year-old woman who had epidermal nevi arranged in a linear pattern since childhood. Her epidermal nevi were located in her left chest, arm and shoulder, upon which multiple trichillemal cysts seemed to develop after several years. We think that this patient with linear epidermal nevi associated with multiple trichilemmal cysts is a rare and distinctive case. (Korean J Dermatol 2009;47(1):55~58)
서브 마이크로 구조를 가진 실리콘 표면의 마찰 특성 연구
한지희(Ji-Hee Han),한규범(Gue-Bum Han),장동영(Dong-Yong Jang),안효석(Hyo-Sok Ahn) 한국트라이볼로지학회 2017 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.33 No.3
The understanding of the friction characteristics of micro-textured surface is of great importance to enhance the tribological properties of nano- and micro-devices. We fabricate rectangular patterns with submicron-scale structures on a Si wafer surface with various pitches and heights by using a focused ion beam (FIB). In addition, we fabricate tilted rectangular patterns to identify the influence of the tilt angle (45° and 135°) on friction behaviour. We perform the friction test using lateral force microscopy (LFM) employing a colloidal probe. We fabricate the colloidal probe by attaching a 10±1-μm-diameter borosilicate glass sphere to a tipless silicon cantilever by using a ultraviolet cure adhesive. The applied normal loads range between 200 nN and 1100 nN and the sliding speed was set to 12 μm/s. The test results show that the friction behavior varied depending on the pitch, height, and tilt angle of the microstructure. The friction forces were relatively lower for narrower and deeper pitches. The comparison of friction force between the sub-micro-structured surfaces and the original Si surface indicate an improvement of the friction property at a low load range. The current study provides a better understanding of the influence of pitch, height, and tilt angle of the microstructure on their tribological properties, enabling the design of sub-micro- and micro-structured Si surfaces to improve their mechanical durability.
노용관 ( Yong Kwan Rho ),유광호 ( Kwang Ho Yoo ),김지영 ( Ji Young Kim ),이갑석 ( Kap Sok Li ),서성준 ( Seong Joon Seo ),홍창권 ( Chang Kwun Hong ),송계용 ( Kye Yong Song ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.12
Spindle cell lipoma is a benign, subcutaneous neoplasm typically located on the neck, back and shoulder of men. Pseudoangiomatous spindle cell lipoma is a rare variant of spindle cell lipoma that is characterized by non-vascular branching spaces. A 64-year old man presented with 2 masses on the abdomen. Although 1 tumor had a very low fat component, it could be histologically diagnosed as pseudoangiomatous spindle cell lipoma due to CD 34 positive spindle cells, ropey collagen and blood vessels. We report a case of pseudoangiomatous spindle cell lipoma on the abdomen, which was diagnostically difficult due to a scanty fat component. (Korean J Dermatol 2008;46(12):1644∼1647)
두 종류의 일체형 비구면 인공수정체 삽입 수술 후 장기 임상 결과의 비교
박용석(Yong Seok Park),지영석(Yong Sok Ji),윤경철(Kyung Chul Yoon) 대한안과학회 2016 대한안과학회지 Vol.57 No.2
목적: 백내장 수술 시 반짝임 변성 방지 일체형 비구면 인공수정체 삽입 수술 후 장기 임상 결과를 기존의 일체형 비구면 인공수정체와 비교 분석하고자 하였다. 대상과 방법: 반짝임 변성 방지 일체형 비구면 인공수정체인 enVista MX60을 삽입한 38명의 38안(A군)과 기존에 널리 이용되는 일체형 비구면 인공수정체인 AcrySof IQ를 삽입한 46명의 46안(B군)의 의무기록을 후향적으로 분석하였다. 술 후 그리고 3, 6, 12개월째의 최대교정시력, 대비감도검사, 인공수정체 반짝임 변성, 목표 굴절값에 대한 구면대응치의 오차, 후낭혼탁 및 주관적인 빛번짐 증상을 비교하였다. 결과: 두 군 모두에서 술 후 12개월째 통계학적으로 유의한 최대교정시력 상승과 대비감도 증가를 보였다(p<0.001). 술 후 12개월째 인공수정체 반짝임 변성은 A군에 비해 B군에서 통계학적으로 유의한 증가가 있었으나(p=0.028), 대비감도검사상 공간 빈도에 따른각 열에서의 최소역치점수 및 주관적 빛번짐 증상은 두 군 간 유의한 차이를 보이지 않았다. 두 군에서 술 후 12개월째 목표굴절값에 대한 구면대응치의 오차는 각각 -0.38 ± 0.27D, -0.36 ± 0.28D였고, 후낭혼탁이 발생한 경우는 각각 2안, 4안이었다. 결론: 반짝임 변성 방지 일체형 비구면 인공수정체인 enVista MX60은 기존의 일체형 비구면 인공수정체인 AcrySof IQ에 비해 수술후 12개월째의 반짝임 변성은 유의하게 적었으나, 최대교정시력, 대비감도 및 주관적인 빛번짐 증상 등 시력의 질적인 면에서는 차이가 없었다 Purpose: To compare the clinical outcomes of glistening-free intraocular lens (IOL) and conventional 1-piece aspheric IOL in implanted in-the-bag. Methods: After phacoemulsification performed by a single surgeon, 2 different IOLs were implanted: enVista MX60 (glisteningfree 1-piece aspheric IOL) in 38 eyes (group A) and AcrySof IQ (conventional 1-piece aspheric IOL) in 46 eyes (group B). Glare symptom score (0-5) obtained by questionnaires, best corrected visual acuity (BCVA), Functional Acuity Contrast Test (FACT), posterior capsular opacity (PCO), glistening formation and spherical equivalent error were compared and analyzed preoperatively and 6 months and 12 months postoperatively. Results: A statistically significant improvement of BCVA and contrast sensitivity postoperatively was observed in all groups. There was statistically significant increase of glistening in group B compared with group A. However, there was no significant difference of FACT scores of spatial frequency in A, B, C, D and E columns and glare symptom score (0-10) obtained by questionnaires 12 months after surgery. Spherical equivalent errors were -0.38 ± 0.27 D and -0.36 ± 0.28 D for groups A and B, respectively. PCO occurred in 2 eyes in group A and 4 eyes in group B. Conclusions: EnVista MX60 IOL showed less glistening formation than AcrySof IQ IOL, however, there was no significant difference in terms of vision quality such as BCVA, FACT and glare symptom score at 12 months postoperatively.
이용덕 ( Yong-duk Lee ),이지영 ( Ji-young Lee ),최영미 ( Young-mi Choi ),공기석 ( Ki-sok Kong ),이상우 ( Sang-woo Lee ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
식당 이용에 있어서 평소 특정 시간대에 사람이 많이 몰려 혼잡한 상황을 완화시켜보고자 이 시스템을 창안하였다. 사용자가 음식예약, 음식나눔(SNS), 공지사항을 선택하면 각 선택메뉴에 맞는 서비스를 제공해준다. 음식예약을 선택하면 원하는 만큼의 음식을 예약 할 수 있고, 사용자는 자신의 주문 내역을 확인할 수 있다. 이 어플리케이션을 사용하기 위해서는 회원으로 가입이 되어 있어야 하고, SNS의 경우 트위터API를 사용하여 연동 구현을 하였다.