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SCHLIEREN法에 의한 空氣中의 水平圓筒둘레에서의 自然對流境界層의 亂流로에 관한 硏究
李澤植 서울대학교 1964 서울대학교 論文集 Vol.14 No.-
A Schlieren method was used to study the transition to turbulence of a free convection boundary layer about the horizontal cylinder. The experiments were performed when the cylinder was suspended in air, and heated electrically. Results for the experiments in steady state show that the critical Reynolds number based on the maximum velocity and boundary layer discharge thickness was 250. And the variation of position of start of turbulence with Grashof number of the cylinder was ◁ 그림삽입 ▷ (원문을 참조하세요) Turbulence was confirmed also by the observation of Schlieren screen as has been stated by Rayleigh.
金甲洙,李澤九,申判湜 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.16 No.2
요약문차량의 소음발산레벨과 속력의 관계는 도로교통소음을 예측하는데 있어서 매우 중요 하다. 따라서, 본 연구는 속도의 함수인 차량의 소음발산레벨을 대형차, 중형차, 소형차로 구 분하여 측정하였으며, 희귀분석을 통하여 소음발산레벨을 분석하였다.회귀분석의 결과로, 평균소음발산레벨 방정식은 다음과 같이 얻었다. 1) 소형차의 평균소음발산레벨은 : 27.304 + 30.20 Log(V) (R2 = 0.87) 2) 중형차에 대한 평균소음발산레벨은 : 27.716 + 34.67 Log(V) (R2 = 0.86) 3) 대형차에 대한 평균소음발산레벨은 : 31.964 + 33.34 Log(V) (R2 = 0.85) 각각의 방정식에 대한 R-square 검정결과 위치 방정식은 유의하다는 것으로 입증되었다.AbstractThe relations between vehicle's sound emission level and velocity are very important for construct of road traffic noise prediction model. Therefore, this study measured vehicle's sound emission level as functions of speed for heavy trucks, medium weight trucks, automobiles, and analyzed sound emission level through the regression analysis.As a results of the regression analysis, mean sound emission level equation is obtain as below. 1) The mean sound emission level of automoblies : 27.304 + 30.20 Log (V) (R2=O.87) 2) The mean sound emission level of medium weight trucks : 27.716 + 34.67 Log (V) (R2=O.86) 3) The mean sound emission level of heavy trucks : 31.964 + 33.34 Log (V) (R2=0.86) Estimate from the value of each R-square, the above equation can be thought to be good.
이성종,이석하,이동기,성낙훈,김택선,심재익,이덕용,유연식,이은노 대한골절학회 1999 대한골절학회지 Vol.12 No.3
The authors analysed the 40 patients of the lateral condyle fracture of the humerus in children who were admitted in Korea Veterans Hospital in Seoul from Jan. 1990 to Dec. 1997. The fracture type and the displacement was classified according to Milch type and Jakob stage. Clinical analysis was performed on 40 patients with lateral condyle fracture of humerus, who could be followed up. The patients were followed up from 12 months to 63 months with an average of 23' months. Average duration of bone union was 6 weeks after operation. The significant differences in outcome were notified from open reduction and internal fixation in comparison to closed reduction and percutaneous pinning. According to the criteria of Hardacre, we obtained excellent result in 16 cases(40%), good result in 22 cases(55%) and poor results in 2 cases(5%).
이성종,박영진,이석하,이동기,김택선,심재익,이덕용,유연식 대한골절학회 1999 대한골절학회지 Vol.12 No.1
The supracondylar fracture of the humerus is the most common fracture of the elbow in children and is occasionally associated with significant residual complications such as cubitus varus deformity. Clincal analysis was performed on 32 patients with displaced supracondylar fractures of humerus, who were treated either by closed reduction and percutaneous pinning or by open reduction and internal fixation. The results were as follows: 1. The average age of the children was 6.8 years old in both sexes, and male to female was 21 : 11. 2. The extension type was 26 cases(82%), flexion type was 6 cases(18%) and the left side was more frequently involved. 3. According to Pirone classification, type II was 14 cases, type III 18 cases. 4. There was no significant difference in the mean duration of bony union between the percutaneous group and the open reduction group. 5. Cubitus varus deformity and limitation of elbow motion were more common complications in open reduction group.
금속판 내고정술과 골수강내 금속정 고정술을 이용한 상완골 간부 골절 치료의 비교
이성종,이석하,이우승,이동기,김택선,심재익,이덕용,유연식 대한골절학회 1998 대한골절학회지 Vol.11 No.3
Authors report 42 cases of humeral shaft fractures, which were treated with plate fixation in 19 cases and intramedullary(IM) nailing in 23 cases, from January 1992 to December 1996. The average time of operation in plate fixation was 100 minutes and that in IM nailing was 65 minutes. The nonunion in plate fixation was 2(10.5%)cases and that in TM nailing was 4(17.4%)cases. Other complications of plate fixation were 2 cases of wound infection and 2 cases of radial nerve palsy. Those of IM nailing were 1 case of limited motion of the shoulder and l case of wound infection. After reviewing above results, we concluded that there were no marked difference between the two operative method in bone union of humeral shaft fracture except diversity of complication.
장기간 간과된 슬개골 골절 불유합의 치료 - 4례 보고 -
이성종,이석하,이동기,김택선,심재익,이덕용,유연식,이은노,조홍만 대한골절학회 1999 대한골절학회지 Vol.12 No.3
Non-union of patella fracture was rare reported. We reported our experience with four cases of non-union of patella fracture treated by surgical intervention. Surgical management by skeletal traction and tension band wiring achieved union of the fracture in all four cases. The patients also recovered an excellent range of movement and strength in the affected knees.
이성종,이석하,이동기,유연식,심재익,김택선,이덕용,이은노,김윤엽 대한골절학회 1999 대한골절학회지 Vol.12 No.4
The femoral supracondylar and intercondylar fractures are difficult to be treated due to severe soft tissue damage, comminution, intraarticular extension of fracture and injury to the quadriceps mechanism frequently. The causes of nonunion are inadequate anatomical reduction, fixation failure, bone defect and infection occasionally, which is difficult to be treated. The authors analyzed 16 cases with nonunion of femoral supracondylar and intercondylar fracture who had been treated surgically from January 1990 to December 1997. According to AO/ASIF classification in the initial fracture patterns, type A were 8 cases, type B was 1 case and type C were 7 cases. The duration between initial treatment and surgical treatment of nonunion was 6 months in average. The causes of nonunion were fixation failure due to inadequate device selection in 9 cases, inadequate anatomical reduction or surgical technique in 4 cases and infection in 3 cases. The treatments were internal fixation with Dynamic condylar screw(DCS) in 9 cases, internal fixation with condylar blade plate in 4 cases, monofocal lenghtening with Ilizarov in 1 case and bifocal lenghtening with Ilizarov in 2 cases. According to Schatzker classification, the good result was obtained in 11 cases(68.8%). The complications were 3 knee joint ankyloses, 2 superficial wound infections, 1 delayed union and 1 deep vein thrombosis. In conclusion, the requirement for the good result in treatment of nonunion are exact anatomical reduction, rigid fixation and autogenous bone graft.