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동종 전경골건과 자가 슬괵건을 이용한 관절경적 전방 십자 인대 재건술의 결과 비교
윤경호,배대경,소동혁,이정환,김정원,박수연,Yoon, Kyoung-Ho,Bae, Dae-Kyung,So, Dong-Hyuk,Lee, Jeong-Hwan,Kim, Jeong-Weon,Park, Soo-Yeon 대한관절경학회 2007 대한관절경학회지 Vol.11 No.2
목적: 동종 전경골건과 자가 슬괵건을 이용한 전방 십자 인대 재건술 후 임상적 평가와 추시 관절경을 통한 이식물의 재형성 정도를 비교, 분석하였다. 대상 및 방법: 2002년 3월부터 2005년 8월까지 동종 전경골건과 자가 슬괵건을 이용한 관절경적 전방 십자 인대 재건술 후 1년 이상 추시가 가능하였던 250예를 대상으로 하였다. 동종 전경골건 군 150예, 자가 슬괵건 군 100예였고 평균 추시기간은 각각 15개월, 14개월이었다. 수술 전, 후의 Lachman, Pivot shift, KT-1000 관절계 검사, 2000 IKDC 슬관절 검사를 비교하였고, 29예의 추시 관절경 상 이식건의 강도, 활액막 형성 정도 등을 관찰하였다. 결과: 최종 추시 시 Lachman, Pivot shift, KT-1000 관절계 검사, 2000 IKDC 슬관절 검사 등에서 양 군 간의 차이는 없었다. 추시 관절경상 75%이상의 활액막 형성 정도는 동종 전경골건 군에서 2예, 자가 슬괵건 군은 8예로 자가 슬괵건 군에서 우수하였으나(p=0.005) 강도는 양 군의 차이가 없었다(p>0.05). 결론: 동종 전경골건과 자가 슬괵건을 이용한 전방 십자 인대 재건술 후 양 군의 임상적 차이는 없었고 추시 관절경상자가 슬괵건 군에서 우수한 활액막 형성 소견을 보였다. Purpose: To analyze the clinical results and second look arthroscopic findings of anterior cruciate ligament(ACL) reconstruction with a tibialis anterior tendon allograft and a hamstring tendon autograft. Materials and Methods: We reviewed the cases of athroscopic ACL reconstructions using allogenous tibialis anterior(TA) tendon and autogenous hamstring tendon done from March, 2002 to August, 2005 and followed-up more than 1 year. The 250 cases were included in this study and allogenous TA tendon was used in 150 cases and autogenous hamstring tendon in 100 cases. The mean follow-up period was 15 months and 14 months, respectively. The clinical evaluation was done by Lachman test, Pivot shift test, KT-1000 arthrometer and International Knee Documentation Committee(IKDC) knee score. Graft tension, synovial coverage were observed in cases of second look arthroscopy. Results: At final follow-up, there was no significance between the two groups in clinical examination. On second look arthroscopy, synovial coverage was better in autogenous hamstring tendon group than allogenous TA tendon group(p=0.005). But no difference was found in graft tension(p>0.05). Conclusion: There were no significant differences between the two groups in the clinical results. But autogenous hamstring tendon group had better synovial coverage than allogenous TA tendon group in second look arthroscopy.
유한요소법에 의한 경수로용 핵연료집합체의 낙하충격 해석
윤경호(K-H Yoon),안창기(C-K An),이강희(K-H Lee),송기남(K-N Song) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The drop impact analysis of a fuel assembly for pressurized water reactor (PWR) power plant is executed by finite element analysis method. The used commercial FE codes are the ANSYS and LS-DYNA3D. The analysis results are compared with the previous experimental results. The impact force results differed from the analysis condition depending on how many fuel rods slipped down to the bottom nozzle. And the joint and connection parts between components of a fuel assembly are very important for determining the stiffness of it. The fuel assembly experienced an impact force of approximately 95.65kN when dropped from a height 25 ㎜ with the fuel rods off the bottom nozzle. The developed finite element model and analysis procedure will be useful tool for evaluating the stiffness and strength of a fuel assembly.
전산유체역학을 이용한 고속로용 제어봉집합체의 설계 최적화
윤경호(K.H. Yoon),김재용(J.Y. Kim),오세홍(S.H. Oh),최청열(C.R. Choi) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
CFD analysis of the control rod assembly for sodium-cooled fast reactor is introduced. The experimental method of the mock-up CRA was established under submerged water condition to validate the analysis model and method. The design optimization of the CRA was carried out using validated analysis model and method. The optimization variables are drop time and damping performance of a damper. The revised design was satisfied with these design variables.
윤경호(K-H Yoon),이강희(K-H Lee),송기남(K-N Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
The pendulum type impact test is established for evaluating the buckling behavior of a grid structure under the lateral impact load. This grid structure is composed several thin plates by laser welding. The test data acquired as initial impact angular, which were impact acceleration, force and duration time. These critical buckling strength are affected the configuration of grid structure. The cylindrical tube insertion case with fuel rod cell showed higher strength than that of the empty grid structure. And the thicker cylindrical tube insertion case with guide tube cell also represented a little higher value than that of the only fuel rod tube configuration case. Even though, the support condition of the grid structure was non-linear characteristic behavior due to friction force between two parts, these cylindrical tube cases expressed much higher than that of the only shell structure case. When the design criteria for the seismic and accident event will be raise in next generation fuel, it needs more robust design grid structure by shape optimization of the strap and joint connection method re-design.
자유낙하에 의한 경수로용 핵연료집합체의 동적 거동 해석
윤경호(K-H Yoon),김형규(H-K Kim),전태현(T-H Chun),안창기(C-K Ahn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The objective of this research is to propose the methodology that could predict the dynamic failure behavior on the pressurized water reactor (PWR) fuel assembly structure for the reactor coolant pump (RCP) over-speed transient event. To perform this objective, the finite element analysis method for predicting the axial impact behavior on the fuel structure is established by a commercial finite element codes ANSYS and DYNA-3D. In this FE analysis method, appropriate boundary conditions and impact loading conditions are applied to simulate the actual core conditions. The drop impact analysis of a fuel assembly for PWR power plant is executed by the finite element analysis method. The analysis results are compared with the previous experimental results. The impact force results differed from the analysis condition depending on how many fuel rods slipped down to the bottom nozzle. And the joint and connection parts between components of a fuel assembly are very important for determining the stiffness of it. In the analysis, the fuel assembly experienced an impact force of approximately 111.53 kN when dropped from a height 25 mm with the fuel rods on the bottom nozzle. The secondary peak value is about 57.55 kN and the duration is about 6 milliseconds. After comparing with the previous test results, the developed finite element model and analysis procedure will be useful tool for evaluating the dynamic stiffness and strength of a fuel assembly. It is found that the joint and connection characteristics among parts are dominant factor which determine the non-linear behavior of a fuel during free fall event.