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Three-dimensional vortex structure near a corner of a translating plate
김대겸,Kim, Daegyoum The Korean Society of Visualization 2015 한국가시화정보학회지 Vol.13 No.1
Three-dimensional vortex structures in the corner region of translating normal plates are visualized experimentally with defocusing digital particle image velocimetry. Vortex formation processes for three plates with corner angle $60^{\circ}$, $90^{\circ}$, and $120^{\circ}$ are compared in order to study the effect of corner shape on vortex formation. In all cases, the self-induction of the starting vortex and its interaction with the potential flow induced by the moving plate cause the vortex to change its form dynamically after the plate starts to translate. While the vortex near a corner follows the plate in the low corner angle of $60^{\circ}$, the vortex separates early from the plate and its forward motion becomes slow in the high corner angle of $120^{\circ}$. It is also found that the starting vortex can transport inward at the corner, which depends on the corner angle.
김대겸 대한의사협회 2023 대한의사협회지 Vol.66 No.1
Background: Recently, it was revealed that Jong-Ha Kim was the first self-employed Korean physician in Daejeon city of South Korea during the Japanese colonial period. However, little is known about him. In this paper, the author aimed to search for historical records of his activities as the first Korean physician in Daejeon city. Current Concepts: Kim’s clinic in Daejeon city was called Chung-Ang Clinic. This is all that has ever been confirmed about Jong-Ha Kim. The author has been searching for his medical record for the last year. Kim’ medical records were collected from journal papers on the modern history of Korea, National Institute of Korean History database, Naver news library archive, official gazette of the Japanese government-general of Korea, database of Seoul National University alumni, and a resume of a professor at the Hamhung Medical School. The results are as follows. He was born in Shinchang-ri Hamheung city Hamgyeongnam-do on August 9, 1900. He graduated from the missionary school established by Canadian missionaries and was admitted to Kyungseong (Keijo) Medical School in 1918. It was recently discovered that he participated in the Independence movement on March 1, 1919. His picture, an old leaflet for his clinic which he had used, and his resume as a professor at the Hamhung Medical School were discovered for the first time. Discussion and Conclusion: The historical records of Jong-Ha Kim’s life provide insight into the lives of contemporary doctors in modern Korea. During the period of 1900 to 1950, which encompasses his historical records, significant events took place in Korean history, and he actively participated in these events. Despite facing numerous difficulties as a doctor in modern Korea, Jong-Ha Kim made decisions that had a great impact. He was a great doctor who served as a good role model.
자발성 세균성 복막염 환자의 진단에 있어서 시험지봉(Reagent Strips)검사의 유용성
김대겸,서동진,김기덕,최원범,김성훈,임영석,이한주,정영화,이영상 대한간학회 2005 Clinical and Molecular Hepatology(대한간학회지) Vol.11 No.3
Background/Aims: Spontaneous bacterial peritonitis (SBP) is one of the potentially life-threatening complications for patients with liver cirrhosis, and it has a mortality rate of over 20%. Early diagnosis of SBP and immediate use of an adequate antibiotic therapy are very important for achieving a better prognosis. The aim of our study was to assess the usefulness of reagent strips for making the rapid diagnosis of SBP. Methods: A diagnostic paracentesis procedure was performed upon hospital admission in 257 cirrhotic patients (187 males, 70 females; mean age: 54 years) with ascites. Each fresh sample of ascitic fluid was tested using a reagent strip, and the result was scored as 0, 1+, 2+ or 3+. The leukocyte count, polymorphonuclear cell count, blood bottle culture, and chemistry of ascites were also done. Results: We diagnosed 79 cases of SBP and 2 cases of secondary bacterial peritonitis by means of the polymorphonuclear cell count and the classical criteria. When a reagent strip result of 3+ was considered positive, the test’s sensitivity was 86% (70 of 81), the specificity was 100% (176 of 176), and the positive predictive value was 94%. Furthermore, when a reagent strip result of 2+ or more was considered positive, the test sensitivity was 100% (81 of 81), the specificity was 99% (174 of 176), and negative predictive value was 99%. Conclusions: The use of reagent strips is a very sensitive and specific tool for the rapid diagnosis of SBP in cirrhotic patients. A positive result should be an indication for empirical antibiotic therapy, and a negative result may be useful as a screening test to exclude SBP. 목적: SBP는 복수를 동반한 간경변 환자에서 흔히 보는 심각한 합병증이다. 신속한 진단과 치료로 생존율의 많은 향상이 있어 왔으나 아직도 병원 내 사망률이 20%를 넘는 중한 질환이다. 본 연구의 목적은 간경변증 환자에 있어서 소변 시험지봉으로 SBP를 신속하고 정확하게 진단할 수 있는지 그 유용성을 평가하는 데 있다. 대상과 방법: 2004년 3월부터 9월까지 입원한 간경변증 환자 중 복수를 동반하여 진단 목적의 복수천자를 시행한 257명의 환자(남자 187명, 여자 70명, 진단 당시 평균 연령 54세)를 대상으로 하였다. 복수는 천자 후 즉시 시험지봉 지시부에 묻혀 90초 간 기다린 후 발색 정도를 제조사가 제공한 비색지와 비교하여 0, 1+, 2+, 또는 3+ 의 4등급으로 판정하였다. 복수는 또한 세포검사, 백혈구 수, 다형핵 백혈구 수, 배양검사, 화학적 검사를 시행하였다. 결과: 복수 내 다형핵 백혈구 수 측정으로 79명의 SBP 환자와 2명의 2차성 세균성 복막염 환자를 진단하였다. 시험지봉 3+ (PMN 500/mm3)를 양성 기준으로 하였을 때 민감도는 86% (70/81), 특이도는 100% (176/176), 양성예측값은 94%였다. 시험지봉 2+ (PMN 75/ mm3) 이상을 양성 기준으로 하였을 때 민감도는 100% (81/81), 특이도는 99% (174/176), 음성예측값은 100%였다. 결론: 간경변증 환자에서 시험지봉으로 SBP를 진단하는 방법은 매우 민감하고 특이적이며 빠르고 간편하게 응급으로 시행될 수 있다. 복수천자와 동시에 결과를 알 수 있으므로 양성 결과를 보이면 복수의 다형핵 백혈구 수치가 나오기 전에 바로 경험적으로 항생제 사용을 시작할 수 있고 또한 음성일 경우 SBP의 가능성은 배제할 수 있겠다.