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한준열(Joon Yeol Han) 대한소화기학회 2002 대한소화기학회지 Vol.39 No.1
Screening for detection of hepatocellular carcinoma (HCC) has been accepted for the management of patients with chronic liver disease. In order to decrease mortality, the early detection of HCC is very important. Generally, HCC smaller than 3㎝ in diameter can be cured. Ultrasonography is the most frequently used imaging test for screening of HCC. HCC smaller than 1㎝ is seldom detected with ultrasonography. Therefore, the duration of growth from 1㎝ to 3㎝ appears to be used to determine the optimal interval of screening for HCC. The mean doubling time of HCC has been reported to be between 3.5 and 7 months, its difference was variable according to patients. Therefore, six-month screening is believed to detect most of HCC smaller than 3㎝. However, shortening of the interval and/or the use of additional diagnostic methods such as abdominal CT should be considered according to clinical characteristics of patients. (Korean J Gastroenterol 2002;39:1-3)
폐암에 의한 기관지 폐쇄의 레이저 Phototherapy 1 예
한준열,백남종,박성학,박석영,김석영,임계순 대한내과학회 1987 대한내과학회지 Vol.33 No.4
Major bronchial obstruction by lung cancer is troublesome. Radiation therapy has been the choice of treatment, but it may take long time until relieving bronchial obstruction and has some complications. Recently, laser phototherapy is applied to treatment of malignant obstruction by lung cancer and esophageal cancer, and with increasing frequency and with promising short-term results and acceptable complication rates. We experienced a case of laser phototherapy of malignant airway obstruction of left main bronchus due to squamous cell carcinoma. A 60-year old woman was admitted to the hospital because of dyspnea. Three times of laser phototherapy with Nd-YAG laser was performed with intervals more than three days. The bronchial obstruction was relieved and the procedure was very tolerable.
韓應敎,李在晙,金在烈 韓國非破壞檢査學會 1988 한국비파괴검사학회지 Vol.8 No.1
Recently, it is gradually raised necessity that thickness of thin film is measured accurately and managed in industrial circles and medical world. In this study, regarding to the thickness of film which is in opaque object and is beyond distance resolution capacity, thickness measurement was done by MEM-cepstrum analysis of received ultrasonic wave. in measurement results, film thickness which is beyond distance resolution capacity was measured accurately. And within thickness range that don't exist interference, thickness measurement by MEM-ceptrum analysis was impossible.
Han Sae Kim,Jin Ho Lee,Dong Yeol Lee,Hee Yeoun Kim,Dong Han Kim,Joon Seok Oh,Yong Hun Sin,김중경,황선덕 대한이식학회 2020 Korean Journal of Transplantation Vol.34 No.2
Transplant renal artery stenosis (TRAS) is one cause of allograft dysfunction. TRAS causes parenchymal necrosis and graft insufficiency. Herein, we report the case of a 40-year-old female with end-stage renal disease due to immunoglobulin A nephropathy, who underwent kidney transplantation with her elder sister. The surgery was successful and the allograft showed primary graft function. At postoperative day (POD) 2, urine output decreased sharply. We checked a non-enhanced abdominal computed tomography scan which showed subcapsular and pelvic cavity hematomas. She underwent hematoma removal surgery with renal upper polar capsulotomy. Bleeding control was successful, but her serum creatinine was 5.4 mg/dL. At POD 25, abdomen magnetic resonance angiography showed significant stenosis at the anastomosis site between the graft renal artery and the recipient’s internal iliac artery. Then, percutaneous transluminal angioplasty was implemented. Significant stenosis (>80%) was detected at the anastomotic site and a 5-mm stent was inserted at stenotic lesion with post-stent balloon angioplasty using a 5-mm balloon catheter. The renal arterial diameter and blood flow were normalized. At postoperative 5 months, a 99mTc dimercaptosuccinic acid scan showed multiple focal radioisotope defects. At 54 months after renal transplantation, her serum creatinine level was 4.0 mg/dL and her glomerular filtration rate was 13 mL/min/1.73 m2. Hence, we report that TRAS can cause parenchymal necrosis and allograft dysfunction.
B형 급성 및 만성간염이 간경변으로 이행하는 병리조직학적 양상
한준열,정환국 대한간학회 1996 Clinical and Molecular Hepatology(대한간학회지) Vol.2 No.2
The chronic active or aggressive hepatitis B, in which periportal inflammation(piecemeal necrosis) is conventionally accepted as the pattern of progression to cirrhosis', implies little concern with intralobular necroinflammation as a process responsible for aggravation and progression. Some published observations, however, refer to episodes of acute necrotizing bouts(subacute hepatic necrosis) have been reported$quot;. For technical reasons, relatively few sequential biopsy studies of chronic hepatitis B are available and particularly, initial acute hepatitis B is barely documented since biopsies are now rarely perfomed in acute stages of hepatitis4. Moreover, most published sequential studies are complicated by therapeutic intervention . The availability of Korean sequential biopsy specimens and the increasing interest in parenchymal changes in the evolution of hepatitis B encouraged the description of the progression of acute and chronic hepatitis B to cirrhosis. During the long-term follow-up study, acute bouts of intralobular parenchymal necroinflammation are observed whenever the stage of aggravation is caught and the biopsy is possible. Whatever the result of these studies, the observation presented suggests a major role of parenchymal changes in the evolution of chronic hepatitis B and this experience focuses on the important lesions of the lobular parenchyma in classification and evaluation of chronic hepatitis'. Seven patients are selected on the basis of elevated S-ALT level, and submit to repated needle biopsies during a 6-month period$quot;. Of these, 2 cases show chronic active hepatitis with early cirhosis constantly, and in 5 cases CAH appear 1 or 2 times in each case during the follow-up period. In clinical follow-up after the sequential biopsies, these 7 patients were all healthy at least for an average of 18.6 years ranging from 14 to 27 years, except for one who developed into HCC without complication of cirrhosis. Thus, while the sample size of this study is small, continuous piecemeal necrosis seems not to be a pattern of progression to cirrhosis. In conclusion, acute and chronic hepatitis B experienced in Korea appear to progress to cirrhosis by means of repeated acute episodic bouts of intralobular necroinflammation, and the conventional concept that continuous progress by piecemeal necrosis seems not to hold true.
친환경 전력기기 개발을 위한 Dry Air 절연파괴특성 연구
김준연(Joon-Yeon Kim),김용한(Yong-Han Kim),석복렬(Bok-Yeol Seok) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Dry air is one of the most promising insulation media for eco-friendly high voltage apparatuses. In this study, the lightning impulse breakdown characteristics of dry air were investigated experimentally to establish the insulation design criteria of DAIS (Dry Air Insulated Switchgear). The dielectric experiments with sphere-to-plane electrode systems were performed in order to analyze the gap discharge characteristics of dry air. The gap length and the pressure of dry air were varied within the range of 15∼35㎜ and 0.1∼0.3㎫, respectively. As a result, the breakdown voltage of dry air at 0.1㎫ was about 10% higher than that of air. And the breakdown voltage of 0.3㎫ dry air was about 2.2 times higher than that of 0.1㎫ dry air. Also, the dielectric strength of epoxy and dry air composite insulation was analyzed with experiments by using the epoxy-molded rod-to-plane electrodes. Through the experiments, it was found that the breakdown voltage was highly dependent on the maximum electric field of dry air gap, regardless of the molded epoxy resin thickness.