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소듐냉각 고속로 연료봉단의 접촉부 손상예측을 위한 가속시험 방법
김형규(Hyung-Kyu Kim),이영호(Young-Ho Lee),이현승(Hyun-Seung Lee),이강희(Kang-Hee Lee) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.5
본 논문은 한국원자력연구원에서 개발 중인 소듐냉각 고속로 핵연료의 연료봉 하단 마개에 있는 관통구멍과 마운팅 레일의 원기둥 형상과의 접촉부에 발생하는 접촉 손상을 예측하기 위한 가속시험 방법을 연구한 것이다. 가속시험 조건으로서 연료봉의 유체유발진동수 및 진폭을 유한요소 해석을 통하여 구하였다. 약 35000 시간의 연료봉 수명기간을 고려한 가속시험 시간을 결정하기 위해 일반 기계부품류의 신뢰성 평가 방법을 적용하였으며, 이때 가장 보수적인 형상 모수와 원자로 내에서의 연료봉 파손 허용 개수 기준 및 연료봉 피복관 재료인 HT-9강의 피로수명 데이터를 이용하였다. 시편의 개수를 5개로 하였을 때, 최종적으로 계산된 가속 시험시간은 각 시편 당 16.5시간이었다. 가속시험 후 전체 시편에 어떠한 접촉손상도 관찰되지 않을 때 연료봉의 수명기간 중 B0.004 수명이 신뢰수준 99%로 보장되는 것으로 평가하였다. This paper reports the results of an acceleration test to predict the contact-induced failure that could occur at the cylinder-to-hole joint for the fuel rod of a sodium-cooled fast reactor (SFR). To incorporate the fuel life of the SFR currently under development at KAERI (around 35,000 h), the acceleration test method of reliability engineering was adopted in this work. A finite element method was used to evaluate the flow-induced vibration frequency and amplitude for the test parameter values. Five specimens were tested. The failure criterion during the life of the SFR fuel was applied. The S-N curve of the HT-9, the material of concern, was used to obtain the acceleration factor. As a result, a test time of 16.5 h was obtained for each specimen. It was concluded that the B0.004 life would be guaranteed for the SFR fuel rods with 99% confidence if no failure was observed at any of the contact surfaces of the five specimens.
e-MITOCHONDRIA RESEARCH FOR SYSTEMS BIOLOGY AND PROTEOMICS
Hyun Joo(주현),Jae boum Youm(염재범),Taeho Kim(김태호),Nari Kim(김나리),Won sun Park(박원선),Sunghyun Kang(강성현),Dang Van Cuong,Hyoung kyu Kim(김형규),Tran Min Khoa,Vu Thi hu,Hyunju Kim(김현주),Hyejin Moon(문혜진),Hyunsuk Le 한국생물공학회 2005 한국생물공학회 학술대회 Vol.2005 No.10
안전정지지진 조건에서 소듐냉각고속로 핵연료 집합체의 Lifting-off 해석
이현승(Hyun-Seung Lee),윤경호(Kyung-Ho Yoon),김형규(Hyung-Kyu Kim),천진식(Jin-Sik Cheon),이찬복(Chan-Bock Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The Korea Atomic Energy Research Institute(KAERI) has been developing Sodium-cooled Fast Reactor(SFR). The stability of the fuel assembly of SFR, supported on the grid plate and held position by self weight. Top of fuel assembly has free boundary conditions. Hence, there is a concern of lifting off during SSE(Safe Shutdown Earthquake). Therefore, it is necessary to carry out the evaluation of the lifting-off of fuel assembly under vertical acceleration in consideration of the SSE.
소듐냉각고속로 핵연료 집합체의 취급 및 운송시 구조건전성 평가
이현승(Hyun-Seung Lee),윤경호(Kyung-Ho Yoon),김형규(Hyung-Kyu Kim),천진식(Jin-Sik Cheon),이찬복(Chan-Bock Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The Korea Atomic Energy Research Institute(KAERI) has been developing Sodium-cooled Fast Reactor(SFR). A fuel assembly was main components of SFR. Fuel assembly must maintain structural integrity because it was contained fuel rods. One of the evaluation of structural integrity was the handling and transport conditions. A load that may occur during transport and handling of the fuel assemblies was considered. In consideration of safety, the load was applied 6 times self weight. This paper was to evaluate the structural integrity during handling and transportation of the fuel assembly.
지속성 외래 복막투석중인 당뇨성 신부전에서 Verapamil 의 복강내 투여가 β2 - Microglobulin 에 미치는 영향
변현주(Hyun Ju Byun),차대룡(Dae Ryong Cha),권현민(Hyun Min Kwon),권영주(Young Ju Kwon),조원용(Won Yong Cho),김형규(Hyoung Kyu Kim) 대한내과학회 1991 대한내과학회지 Vol.41 No.5
N/A In diabetic renal failure, generalized vasculopathy including capillaries is presented, and so there may be some difference in ultrafiltration and mass transport from that of non-diabetic renal failure. Recently, several studies show that intraperitoneal administration of Ca++ antagonist may increase ultrafiltration and mass transport of small molecular weight substance in CAPD. It suspected that the effect of intraperitoneal administration of verapamil on CAPD, may have different response in diabetic and non-diabetic renal failure. In order to evaluate the effects of calcium antagonist (verapamil) on the permeability of the peritoneal membrane in patients on CAPD, serum levels and clearances of creatinine, urea, and β2-Microglobulin, mass transferarea coefficient, ultrafiltration rate and glucose absorption were measured. The study group was devided by 5 non-diabetic (age 33.4+12.4 years, treated for 10.1+8.4 months, Group I) and 5 diabetic (age 53.2+13.7 years, treated for 16.6+15.2 months, Group II) renal failure patients and the study was carried out using 1.65% dextrose dialysate solution for 240 minutes dwell time (phase I), and after the intraperitoneal administration of 10 mg of verapamil the peritoneal dialysis was done by same method as phase I (1phase II). To evaluate the effects of verapamil, percent difference of change between phase I and phase II was calculated. All the values here are mean. The results are: 1) Serum levels of creatinine and β2-Microglobulin were lower in Group II (11.4 vs 6.8 mg/dl, 39.4 vs 18.2 mg/dl) (p<0,01). 2) Peritoneal clearance of creatinine was higher in Group II (6.322 vs 7.072 ml/min), but the increasing rate after instillation of verapamil was slightly lesser than Group I (6.5 vs 4.0%) (not significant). 3) Peritoneal clearance of β2-Microglobulin was higher in Group II (0.626 vs 0.88 ml/min), and the increasing rate after instillation of verapamil was marked in both group, especially in Group I (83.5 vs 36.1%) (not significant). 4) MTAC was higher in Group II (9.7 vs 12.78 ml/min), but the increasing rate of it was greater in Group I (15.4 vs 3.58%) (not significant). The peritoneal permeability was greater in Group 1I probably due to increased permeability and changed structures of peritoneal capillaries in diabetic disease, and the effects of calcium antagonist (verapamil) on peritoneal permeability was lesser in Group II. It suggests that the intraperitoneal administration of verapamil increase the efficiency of CAPD in general, but the benefit may be lesser in diabetic patients.