http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정구충,임재훈,최연선 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.7
The nonlinear dynamic characteristic of a straight tube conveying fluid with constraints and an attached mass on the tube is examined in this study An experimental apparatus with an elastomer tube conveying water which has an attached mass and constraints is made and comparisons are made between the theoretical results from the non-linear equation of motion of piping system and the experimental results. The comparisons show that the tube is destabilized as the magnitude of the attached mass increases, and stabilized as the position of the attached mass closes to the fixed end. In case of a small end-mass, the system shows complicated and different types of solutions. For a constant end-mass. the system undergoes a series of bifurcations after the first Hopf bifurcation, as the flow velocity increases. which causes chaotic motions of the tube eventually.
정구충,최연선 한국소음진동공학회 2001 한국소음진동공학회 논문집 Vol.11 No.6
Vibration problems occurred in an air cooled heat exchanger with axial flow fan for a petrochemical plant were investigated. Experimental field test and theoretical verification were performed. To find the main cause of the high vibration of the fan at the air inlet of the axial fan, the frequency spectrum was measured. The natural frequency of the driving support of the heat exchanger was numerically calculated. Both of the measured and the natural frequency were approximately equal to the blade passing frequency. Because it was difficult to modify the structure of the driving support during the normal operation of the plant, the blade number of the fan was increased, which greatly reduced the vibration level of the heat exchanger.
長掌腱(palmaris Longus Tendon)을 이용한 先天性 眼瞼下垂症의 治驗例
鄭求忠,馬興洙,李鐘建,李在雄 大韓成形外科學會 1986 Archives of Plastic Surgery Vol.13 No.3
The result of the surgical correction of the congenital blepharoptosis is determined by the nature of ptosis, operative method, operator's technique and post operative care. Among the factors levator function is most important, therefore, preoperative assessment of the levator function and surrounding structures must be carefully performed for the best operative result. Frontalis suspensions using autogenous fascia have been widely used in the cases whose levator funtions are less than 2mm. But the method may develop some postperative problems; recurrence due to absorption or loosening of fascia lata, complexity of the operative procedures, herniation of the muscles in lateral thigh and hematoma. Because of these problems, many considerations were prompted to use the autogenous tendon. Authors report 3 cases of congenital blepharoptosis who have been satisfactorily corrected by frontalis suspension method using palmaris longus tendon.