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이경용(Kyung-Yong Lee),김종환(Jong-Hwan Kim),이기범(Kee-Bhum Lee),정재권(Jae-Kwon Jung) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.6
본 논문은 초음속 환경에서 운용되는 원통형 비행체가 비행중 경험하는 공력하중 및 공력가열 현상을 지상에서 유사하게 모사하기 위한 내열구조시험 기법 및 시험결과에 대하여 기술하였다. 시험 중 시험 구조물의 자세를 공중에서 제어하거나 시험 중지 중 시험구조물을 지지할 목적으로 스프링을 이용하는 특별한 자세제어장치가 설계되었다. 시험구조물에 공력하중과 열하중을 부가하기 위하여 유압식 외력하중부가 장비와 전기식 열부가 장비를 사용하였다. 특히, 복사방식의 수백 개 석영램프가 열부가장비에 응용되었으며, 이들을 이용하여 여러 가지의 열특성 시험조건이 해석조건과 유사하게 지상에서 성공적으로 구현되었다. 연구결과 본 내열구조강도시험기법은 외력 및 극심한 열하중에 노출된 원통형 구조물의 구조적 건전성을 실험적 방법에 의거 지상에서 검증하거나 설계 개선에 필요한 공학자료를 획득하는데 적합한 방법임이 입증되었다. This paper describes the structural strength test technique and the results for cylindrical supersonic vehicle subjected to both aerodynamic load and thermal load. The special positioning system using spring links was designed to float, support and restrain the test airframe during the test and the down-time. The hydraulic system and the electric heating system were utilized to apply the aerodynamic load and the thermal load to the test airframe together. Particularly, several hundreds of infrared quartz lamps were used for the heating system, and the thermal test conditions were successfully simulated. The test results showed that this kind of high temperature test is adequate to verify the structure integrity and produce useful engineering data which is necessary for the possible structural modification under thermal environments.
이경용 ( Kyung-yong Lee ),류상욱 ( Sang-uk Ryu ),이승빈 ( Seung-bin Lee ),신영민 ( Young-min Shin ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2
티켓은 우리의 문화생활을 위한 필수 불가결한 요소이다. 그러나 기존의 티켓 시스템에 대한 소비자들의 불만과 악의적인 범죄 피해가 늘어가는 상황에서 새로운 대안의 필요성이 커졌다. 이를 해결하고자 Klaytn 기반의 NFT 시스템으로 티켓을 NFT화하여 수수료 및 환불에 대한 소비자들의 피해와 불만을 해소하고, 티켓 거래의 투명성을 제고하는 티켓 예매 및 거래 플랫폼 방안을 제시한다.
이경용(Kyung Yong Lee),임규성(Kyu Sung Rim),신도영(Do Young Shin),김우중(Woo Joong Kim),김정완(Jung Wan Kim),이서우(Seo Woo Lee) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.1
One patient with hemochromatosis which is rare in this country has been clinically studied. A fifty-two year old male was admitted to our hospital with complaints of general weakness, fatigue, epistaxis and abdominal distention. There was a family history of liver cirrhosis, but patient denied any previous blood trasfusion or an ingestion of iron-preparation. Physical examination revealed typical brown-colored skin on face, neck and hands, mild icterus on sclera, many spider angioma over anterior chest wall and marked palmar erythema. Laboratory examination disclosed mild hyperglycemia, moderate impairment of liver function tests and moderately increased the serum iron level and markedly elevated the serum ferritin level. There was evidence of hemosiderin pigment on the specimen of liver biopsy. The treatment was chiefly aimed to the control of frequent impending hepatic coma, ascites and spontaneous bacterial peritonitis, but the patient died of worsening the general conditions during follow-up.
Type 316LN 스테인리스강의 크리프 균열성장 거동
이경용(Kyung Yong Lee),김우곤(Woo Gon Kim),류우석(Woo Seog Ryu),윤기봉(Kee Bong Yoon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Creep crack growth (CCG) behavior of type 316LN stainless steel was investigated using C* and Ctparameter.<br/> The CCG tests were conducted with various applied loads at 600℃, and tension and creep tests<br/> were followed to obtain mechanical properties of type 316LN steel at 600℃. As a result of this performance,<br/> C* and Ct-parameter showed a good agreement between theoretic and experimental results. The reason of this<br/> result was thought that type 316LN steel was shorter than other steels in transition time during creep. The<br/> modeling equation by Ct-parameter was newly proposed for type 316LN steel. This model can be utilized to<br/> evaluate the CCG of type 316LN steel.
증례 : 순환기 ; 심실중격결손에 의해 과다 폐색전증의 증상이 발현되지 않은 1예
이경용 ( Kyoung Yong Lee ),정우조 ( Woo Cho Chung ),김경중 ( Kyung Joong Kim ),두영재 ( Young Jae Doo ),최지욱 ( Jiwook Choi ),윤영섭 ( Yeong Seop Yun ),이재범 ( Jae Beom Lee ) 대한내과학회 2015 대한내과학회지 Vol.89 No.1
과다 폐색전증, 심실중격결손과다 폐색전증(massive pulmonary thromboembolism)은 빠른 치료가 사망률을 낮출 수 있기 때문에 폐색전증 중에서도 초기에 진단하는 것이 중요하다. 그러나 환자의 여러 요인으로 인해 폐색전증은 다른 양상의 혈역학적 효과를 보일 수있으므로 초기 진단이 어려울 수 있으며, 이는 사망률을 높이게 될 수 있다. 저자 등은 72세 여자 환자에서 2개월 전부터 서서히 악화된 호흡곤란을 급성 관동맥 증후군으로 생각하여 검사를 진행하였으나, 결과적으로는 흉부 전산화 단층 촬영을 통해 과다 폐색전증을 진단하였다. 폐색전증 환자에서 일반적 병태생리와 다른 경우에는 심실중격결손의 합병유무에 대해서도 염두에 둘 필요가 있을 것으로 보인다. 저자 등은 72세 여자 환자에서 심실중격결손에 의해 숨겨졌던과다 폐색전증의 증례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Patients with massive pulmonary embolism may present with severe dyspnea at rest, syncope, or cardiac arrest. Early diagnosis and treatment are essential to reduce mortality; however, patient-specific factors can influence the hemodynamic effect of pulmonary embolism. Here, we present a case of massive pulmonary embolism masked by a ventricular septal defect in a 73-year-old female. (Korean J Med 2015;89:85-90)
이경용(Kyung Yong Lee),임규성(Kyu Sung Rim),임태희(Tae Hee Rim),김우중(Woo Joong Kim),최종도(Jong do Choi),조근태(Kun Tae Cho) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.2
N/A The gastrofiherscopy is now considered to be one of the essential diagnostic method of gastric disease. We have ohserved clinically with personal computer analysis on stomach disease. A clinical analysis was carried out on 16,473 patient taken gastrofiberscopy who were considered to have somc stomach disease clincally from February 1980 to July 1987 in dept of internal medicine, Kang Nam Sacred Heart Hospital. Thereafter, the following results were obtained.1) Of 16,473 patient taken gastrofiberscopy, patients who diagnosed having gastric ulcer, cancer, polyp were 2,025 patients. 2) This 2,025 patients revealed that gastric ulcer is the highest frequency (61.3%), the next was gastric cancer (31.6%), and gastric polyp (7.1%) in order. 3) The most prevalent sites of 2.025 patients were body with rate of 36% and next came angle, antrum in order. 4) Viewing the stomach laterally, lesser curvature was most prevalent site and next carne anterior portion, posterior portion, circular portion, greater curvature in order. 5) The most prevalent site of stomach ulcer was angle with the rate of 36.4% and next came body and antrum while lesser curvature was most prevalent site viewing the stomach laterally. 6) The most prevalent site of early stomach cancer was antrum with the rate of 41.6% and next carne body and angle, while lesser curvature was most prevalent site viewing the stomach laterally. 7) The most prevalent site of advanced cancer was antrum with the rate of 47.2% and next came body while lesser curvature was most prevalent site viewing the stomach laterally. 8) The most prevalent site of gastric polyp was antrum with the rate of 58.0% while posterior wall was most prevalent site viewing the stomach laterally.