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최성윤(Sung-Yun Choi),권대규(Dae-Gyu Kwon),이세한(Sea-Han Lee),박태현(Tae-hyun Park),왕덕현(Duck Hyun Wang) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.10
Machining operations require the removal of chips to keep the water-soluble cutting oil clean and fresh throughout the operation time. Water-soluble cutting oil for metal processing is diluted using a 3-8% solution in water which is generally replaced every three to six months. This study aims to develop multiple purification devices to efficiently remove fine contaminating particles from water-soluble cutting oil. The 2D concept designs were created using AutoCAD. The designs were drawn using the 3D modelling feature of CATIA. Flow analysis was performed in a bubble purifier using Ansys computational fluid dynamics (CFD). This analysis has aided in improving the design and structure of the device to create the final prototype. Experiments were conducted to check the prototype"s performance. Comparisons of the effects of each process variable on the experiment was carried out using ANOVA.
전위된 상완골 원위부 과간 골절에서 재건 금속판 및해부학적 잠김 금속판을 이용한 내고정술의 비교
이동주 ( Tong Joo Lee ),김영태 ( Young Tae Kim ),권대규 ( Dae Gyu Kwon ),박주용 ( Ju Yong Park ) 대한골절학회 2014 대한골절학회지 Vol.27 No.4
목적: 성인의 전위된 상완골 원위부 과간 골절의 수술적 치료에서 재건 금속판 및 해부학적 잠김 금속판을 이용한 내고정술의 임상적, 방사선학적 결과 및 합병증 등에 대해 후향적으로 비교 분석하고자 하였다.대상 및 방법: 2002년 8월부터 2012년 5월까지 상완골 원위부 과간 골절로 수술적 치료를 받은 환자 중 재건 금속판을 이용하여 고정한 20예의 환자들을 A군으로, 해부학적 잠김 금속판을 이용하여 고정한 20예의 환자들을 B군으로 하였다. 임상적 결과는 Cassebaum 평가 척도와 Mayo 주관절 기능 평가 척도, disabilities of the arm, shoulder and hand 점수를 이용하여 비교하였다.결과: Mayo 주관절 기능평가 점수는 A군에서 우수 8예, 양호 10예, 보통 2예였으며, B군에서는 우수 12예, 양호 7예, 보통 1예였다. 그 외 수술 후 운동범위가 90도 굴곡부터 120도 굴곡까지 획득된 시기는 A군의 경우 평균 8.3일(6-15일), B군의 경우 평균 5.5일(5-9일)로 두 군 간 유의적인 차이가 있었다(p=0.04). 이 중 골밀도가 낮은 환자 2예에서 나사 이완의 고정소실이 발생하였는데 모두 재건판을 이용한 경우였다.결론: 전위된 상완골 원위부 과간 골절에서 해부학적 잠김 금속판을 이용한 치료는 나사 이완의 합병증을 줄이면서 조기 관절 운동이 가능하여 좋은 임상적 결과를 얻을 수 있는 방법으로 생각된다. Purpose: To analyze the clinical result of a conventional reconstruction plate (CRP) fixation and locking compressive plate (LCP) fixation on the surgical treatment of an adult’s displaced intercondylar fracture of humerus. Materials and Methods: A total of 40 patients enrolled in the study were treated between August 2002 and May 2012. Fixation with a CRP was performed in 20 patients (group A) and anatomical locking compression plate fixation was performed in 20 patients (group B). The clinical and functional evaluation was performed according to the Mayo elbow performance score and Cassebaum classification of elbow range of motion (ROM), disabilities of the arm, shoulder and hand score. Results: The Mayo elbow functional evaluation scores, eight cases were excellent, 10 cases were good, and two cases were fair in group A, and 12 cases were excellent, seven cases good, and one case fair in group B; both groups showed satisfactory results. The durations of attaining 90 to 120 degrees of the ROM of joints postoperatively were 8.3 days on average (6 to 15 days) in group A and 5.5 days on average (5 to 9 days) in group B, demonstrating a significant difference between the two groups (p=0.04). Although the correlations of clinical results according to the difference of bone mineral densities (BMDs) were not statistically significant between the two groups (p=0.35), loss of fixation occurred due to loosening of screws in two patients with low BMDs in whose operations reconstruction plates were used. Conclusion: The use of locking compressive plate on the surgical treatment of an diaplaced intercondylar fracture of humerus have a good clinical results because that permits early rehabilitation through good fixation and reduces the complications such as loosening of screws.
유체로 연성된 직사각평판의 거리 변화에 따른 고유진동 해석
유계형,이명규,권대규,이성철 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-
This study dealt with the experimental modal analysis of the perforated rectangular plate coupled with fluid. The natural frequencies of the perforated plate and solid plate in air were obtained by the analytical method based on the relation between the reference kinetic and maximum potential energy and compared with the experimental results. Good agreement between the results was found for the natural frequencies of the perforated plate in air. It was empirically found the natural frequencies of the perforated plate coupled with fluid. The transverse vibration modes, in-phase and out-of-phase, were observed alternately in the fluid-coupled system. Additionally, the effect of distance between perforated plate and solid plate on the fluid-coupled natural frequency was investigated.