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이유신(You-Shin Lee),정우철(Uh-Cheul Jeong),김규선(Kyu-Sun Kim),박제웅(Je-Woong Park),김도정(Do-Jung Kim),박경훈(Kyung-Hun Park) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.1
The resistance performances of a small leisure yacht with two different keels, center and double, respectively, are investigated using a model test at circulating water channel and CFD analysis. Flow patterns around the keels are observed using a tuft test to make clear the relation between the resistance performance and the flow characteristics around the keels. The results show that the keel does not affect free surface flows and that the double keel yacht has better performance compared to a single keel yacht in oblique condition from the resistance point of view.
BDMI<sub>+</sub> 양이온을 함유한 이온성 액체로부터 흑연으로의 전기화학적 리튬 삽입
이유신,정순기,이헌영,김지수,Lee, You-Shin,Jeong, Soon-Ki,Lee, Heon-Young,Kim, Chi-Su 한국전기화학회 2010 한국전기화학회지 Vol.13 No.3
흑연과 1-buthyl-2,3-dimethylimidazolium(BDMI)계 이온성 액체의 계면 반응을 이해하기 위하여 lithium bis(fluorosulfonyl)imide(LiTFSI)가 용해된 BDMI-TFSI 용액 중에서 전기화학 원자간력 현미경(electrochemical atomic force microscopy, ECAFM)을 이용하여 순환 전압전류법 전후에 있어서의 고배향성 열분해 흑연(highly oriented pyrolytic graphite, HOPG)의 표면을 in-situ로 관찰하였다. HOPG 전극에서 리튬의 가역적인 삽입과 탈리반응은 진행되지 않았으며, $BDMI^+$ 양이온의 삽입에 의한 blister의 형성 및 그라펜 층의 파괴만이 관찰되었다. 한편, $BDMI^+$ 양이온의 삽입 반응은 농도가 4.90 mol/kg인 LiTFSI-propylene carbonate(PC)를 15 wt% 함유하고 있는 BDMI-TFSI계에서는 일어나지 않았으며, 이 경우에는 가역적인 리튬의 삽입과 탈리반응이 진행 되었다. ECAFM 결과는 고농도의 PC계 용액이 solid electrolyte interface(SEI)를 형성함으로 인해 $BDMI^+$ 양이온의 삽입을 막는 매우 효과적인 첨가제임을 나타내었다. In situ electrochemical atomic force microscopy (ECAFM) observations of the surface of highly oriented pyrolytic graphite (HOPG) was performed before and after cyclic voltammetry in lithium bis(fluorosulfonyl)imide (LiTFSI) dissolved in 1-buthyl-2,3-dimethylimidazolium (BDMI)-TFSI to understand the interfacial reactions between graphite and BDMI-based ionic liquids. The formation of blisters and the exfoliation of graphene layers by the intercalation of $BDMI^+$ cations within HOPG were observed instead of reversible lithium intercalation and de-intercalation. On the other hand, lithium ions are reversibly intercalated into the HOPG and de-intercalatied from the HOPG without intercalation of the $BDMI^+$ cations in the presence of 15 wt% of 4.90 mol/$kg^{-1}$ LiTFSI dissolved in propylene carbonate (PC). ECAFM results revealed that the concentrated PC-based solution is a very effective additive for preventing $BDMI^+$ intercalation through the formation of solid electrolyte interface (SEI).
다층 FCAW가 적용된 SS400 맞대기 용접이음부의 기계적 특성 파악을 위한 열탄소성 변형 수치해석
이유신 ( You-shin Lee ),황세윤 ( Se-yun Hwang ),선치웅 ( Chi-woong Seon ),이장현 ( Jang-hyun Lee ) 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.1
This paper presents a numerical procedure to investigate the mechanical strength of SS400 structure joined by multi-pass FCAW. Therefore, an efficient three-dimensional welding simulation model was suggested to predict a mechanical properties of welded structure and investigate its welding deformation, when the multi-layer FCAW method was applied to the butt jointed SS400 panel. This model also is presented in order to get the profile of residual deformation and stress. To define heat source model of FCAW, the welded SS400 specimen with 2-pass FCAW was observed and the heat affected zone was measured. Throughout the consideration of results by the suggested computational simulation, the efficient welding simulation and mechanical characteristics of the specimen are discussed.
내부 장기암의 피부 전이 - 임상 및 병리조직학적 고찰 -
김유찬(You Chan Kim),조광현(Kwang Hyun Cho),이유신(Yoo Shin Lee),함의근(Eui Keun Ham) 대한피부과학회 1987 大韓皮膚科學會誌 Vol.25 No.2
We reviewed clinical records and histologic materials of 96 cases of metastatic skin cancer in Seoul National University Hospital from January 1973 to July 1986. The metastatic skin cancers of male were twice as many as that of female and they occurred most frequently in male at their fifties, female, forties. The most frequent primary cancers in men were carcinoma of the stomach, lung, colorectum and pancreas; in women, carcinoma of the breast, stomach, lung and uterine cervix. Cutaneous metastases from the carcinomas of the liver, uterine cervix and stomach which were many in Korea were smaller in number than that from the carcinomas of the lung and breast. Metastatic lesions were recognized before the primary tumor relatively often in carcinoma of the lung, pancreas and rarely in carcinoma of the uterine cervix, stomach. Though localizations of cutaneous metasta.sis were widespread over all body surfaces, regional areas of primary tumor were predisposed to metastasis. Metastatic carcinoma usually produced nonspecific nodules in the skin. Less commonly, some lesions of metastasis showed inflammatory or sclerotic plaque. The histologic findinga of cutaneous metastases generally mimicked that of primary tumors; nevertheless, in most instances, it was not possible to recognize the original tumor from a histologic examination of metastatic skin cancer and it was possible to classify the metastatic carcinoma only as an adenocarcinoma, a squamous cell carcinoma or an undifferntiated carcinoma.
김유찬(You Chan Kim),김선훈(Seon Hoon Kim),박경찬(Kyoung Chan Park),이유신(Yoo Shin Lee) 대한피부과학회 1988 대한피부과학회지 Vol.26 No.5
Febrile ulceronecrotic PLEVA is an unusually severe from of PLEVA, characterized by the sudden onset of diffuse ulceronecrotic eruption aasociated with high fever. A mild eruption precede the acute fulminating course, We observed a 13-year-old boy presenting the form of febrile ulceronecrotic PLEVA. The histologic features were those of PLEVA. He received the systemic corticosteroids with aupportive care. To recognize this disorder is important because of a possibly fatal outcome, So close attention and vigorous therapy are necessary.
소아에서의 백반증과 탈색모반 - 임상 및 DOPA 염색에 의한 비교연구 -
김유찬(You Chan Kim),김선훈(Seon Hoon Kim),박경찬(Kyoung Chan Park),이유신(Yoo Shin Lee) 대한피부과학회 1988 대한피부과학회지 Vol.26 No.4
We performed analysis of 79 childhood patients diagnosed as vitiligo and nevus depigmentosus in Tediatric Dermatologie Department of Seoul National University Hospital from March 1987 to September 1987. The results were as follows : 1. Of the 79 patients, 31 patients(39.2%) were vitiligo 21 patients(26.6% )were nevus depigmentosus and 27 patients(34.2%)were uncertain by cliniral diagnostic ctriteri.. 2. Viiligo began rarely in infancy(6.4% )and most appeared evenly in all childhood over 1 year old. Nevus clepigmentosus was present at birth in 57.1% of patients and was discovered within the first 6 months after birth in 42.9% of patients. 3. In vitiligo, most lesions were multiple. The most common site of involvement was the face, and there was this tendency of periorficial predisposition. In nevus ciepigmentosus, most lesions were solitary. The most, common aites of involvement were the lowed limbs and trunk, but there was no tendency of periorfcial presposition. 4. We found focal type of vitiligo in,51,6% of patients, vulgaris type in 32. 3 % acrofacial type in 9.6% and segmerital type in 6.5%. We also found isolated pattern of nevus clepigrnento us in 76.2% of patients, ciermatomal p<:ttern in 19.0ki and whorlec1 pattern in 4.8% The contrast enhiancement between the hypopigmented skin and nomal surrounding skin by Wood's light, examinatior reflected the epiclermal melanin pig merit, i. e., the more marked loss of pigmentation, the more accentuatian of the contrast The before, Wood's light examination without I:3OPA staining could help to ciiagnose the atisculte type of vitiligo showing eidermal melanocytes and nevu c.Iepigmeritosus.
윤재일,김유찬,김규한,이애영,이유신 ( Jai Il Youn,You Chan Kim,Kyu Han Kim,Ai Young Lee,Yoo Shin Lee ) 대한피부과학회 1988 대한피부과학회지 Vol.26 No.1
Anthralin과 좌이선을 이용한 Ingram법을 더욱 유용하고 간편하게 한 변형 Ingram법을 36명의 중동증 이상의 심한 입원 건선환자들을 대상으로 하여 시행하였다. 36명 중 28명(77.8%)에서 변형 Ingram 요법으로써 치료 30회 이내에 병변이 소실되었다. 이들은 구간에서는 11.4회, 사지에서는 13.9회의 치료를 요하였으며 치료기간은 구간은 15.8일, 사지는 19.8일을 요하였다. 부작용으로 착색, 소양증과 흥반이 다수에서 나타났으나 이로 인해 치료를 중단한 예는 없었다. N/A
200W 수직축 풍력발전시스템의 로터 블레이드 설계 및 해석에 관한 연구
박제웅 ( Je-woong Park ),이유신 ( You-shin Lee ) 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.1
This study is to examine the structural stability of 200W gyromill type vertical axis wind turbine(VAWT) system. Structural analysis by using commercial software ANSYS is performed to compute the displacement and strength ratio of filament wound composite blades. Evaluate the power performance through analysis and structural integrity through uni-directional FSI analysis in structure design of wind turbine blade. The results of FSI analysis show that the wind turbine reveals an enough structural safety. The maximum structural displacement occurs at trailing edge of blade and the maximum stress occurs at the strut.
송세화(Se-Hwa Song),이종언(Jong-Eon Lee),횡인용(In-Yong Hwang),이유신(You-Shin Lee),김석중(Seok-Joong Kim),최형기(Hyoung-Kee Choi) 한국컴퓨터정보학회 2009 한국컴퓨터정보학회 학술발표논문집 Vol.16 No.2
VoIP기반의 음성통화가 기존 PSTN망을 대체하여 빠르게 확산되고 있다. 이러한 IP기반의 음성통신은 IP 네트워크가 가진 보안 취약점을 그대로 가지고 있어 이에 대한 보완이 필요하다. IPsec은 IP망에서 보안을 제공하는 프로토콜로 데이터의 기밀성 및 무결성을 제공한다. 한편, 서비스 제공자는 적절한 과금 및 서비스 중재 및 부가 서비스 제공을 위해 통신에 사용된 암호화 키를 획득할 수 있어야 한다. 본 논문에서는 IPsec의 키 교환 프로토콜인 Internet Key Exchange v2를 수정하여 서비스 제공자와 통신하는 양 단말이 동시에 키 교환을 수행하도록 한다. 이 방식을 통하여 서비스 제공자가 키 생성에 참여함으로서 Men in the middle 공격을 효과적으로 막을 수 있고, 부가 서비스를 제공할 수 있는 발판을 마련할 수 있다.