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레이저 형광여기법(LIF)를 이용한 러쉬톤 터빈 교반기의 혼합특성에 관한 연구
정은호,김경천,Jeong, Eun-Ho,Kim, Gyeong-Cheon 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.8
A non-intrusive Planar Laser-Induced Fluorescence(PLIF) technique was applied to study the turbulent mixing process in a Rushton turbine reactor. Instantaneous and ensemble averaged concentration fields was obtained by measuring the fluorescence intensity of Rhodamine B tracer excited by a thin Nd:Yag laser sheet illuminating the whole center plane of the stirred tank. The gray level images captured by a 14-bit cooled CCD camera could be transformed to the local concentration values using a calibration matrix. The dye injection point was selected at the tank wall with three quarter. height (3/4H) from the tank bottom to observe the mixing characteristics in upper bulk flow region. There exist distinct two time scales: the rapid decay of mean concentration after the dye infusion reflects the large scale turbulent mixing while the fellowed slow decay reveals the small scale molecular mixing. The temporal change of concentration variance field conjectures the two sequential processes for the batch type mixing. An inactive column of water is existed above the impeller disk, in which the fluid rotates with the shaft but is isolated from the mean bulk flow.
넙다리뒤근육의 유지-이완기법이 무릎관절 각도 증가에 미치는 효과
정은호,김지혁,Jeong, Eun-ho,Kim, Chi-hyok 대한정형도수물리치료학회 2018 대한정형도수물리치료학회지 Vol.24 No.2
Background: The purpose of this study was to investigate the effect of various relaxation techniques on various dysfunction problems caused by shortening of the sagittal muscles. Method: The subjects were 44(18 males, 26 females). The subjects were composed of 3 groups. The experimental group consisted of 14 patients with proprioceptive neuromuscular facilitation stretching (PNF) technique, control group A 15 patients with self myofacial release (SMR) ball exercise, and control group B with 15 patients with Sling exercise. After 3 weeks of relaxation on the hamstring muscle, the length of the hamstring muscle before and after the intervention was compared. Results: The results of relaxation exercise of the snake muscles applied to passive PNF group, SMR ball group, and Sling relaxation group are as follows. 1. In the passive PNF group, the muscle length of the hamstring muscle was significantly increased after the intervention. 2. The muscle length of the hamstring muscle was significantly increased after the intervention in the SMR ball group. 3. Sling relaxation group significantly increased the muscle length of the hamstring muscle after sling exercise intervention. 4. Passive PNF group showed the greatest change in muscle length before and after intervention than SMR ball group and Sling relaxation group. Conclusion: Passive PNF relaxation therapy, SMR ball relaxation therapy, and Sling relaxation therapy applied to the hamstring muscle were effective in increasing muscle length of the hamstring muscle. PNF relaxation therapy showed the most significant effect after 3 weeks intervention.
PIV/LIF기법에 의한 교반혼합기 내의 속도장과 농도장 동시 측정
정은호,윤상열,김경천,Jeong, Eun-Ho,Yoon, Sang-Youl,Kim, Kyung-Chun 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.4
Simultaneous measurements of turbulent velocity and concentration field in a stirred mixer tank are carried out by using PIV/LIF technique. Instantaneous velocity fields are measured with a 1K$\times$1K CCD camera adopting the frame straddle method while the concentration fields are obtained by measuring the fluorescence intensity of Rhodamine B tracer excited by the second pulse of Nd:Yag laser light. Image distortion due to the camera view-angle is compensated by a mapping function. It is found that the general features of the mixing pattern are quite dependent on the local flow characteristics during the rapid decay of mean concentration. However, the small scale mixing seems to be independent on the local turbulent velocity fluctuation.
혈액투석 환자에서 경요도방광종양절제술 후 발생한 경요도절제후 증후군 2예
정은호 ( Eun Ho Jeong ),김은나 ( Eun Na Kim ),왕희배 ( Hee Bae Wang ),김태호 ( Tae Ho Kim ),박정석 ( Jeong Suk Park ),김태형 ( Tae Hyung Kim ),김진우 ( Jin Ou Kim ),서상렬 ( Sang Yeol Suh ),성원섭 ( Won Sub Seong ) 대한신장학회 2011 Kidney Research and Clinical Practice Vol.30 No.4
Transurethral resection syndrome (TURS) is one of the complications of endoscopic transurethral operation with irrigation fluid. TURS comprehensively refer to several clinical symptoms and signs caused by intravascular absorbtion of irrigation fluid, hypertension, bradycardia, arrhythmia, respiratory distress, hypotension, confusion, blindness, seizure, coma, hyponatremia, and hypoosmolarity. TURS is mainly known as the complication of the transurethral resection of prostate (TURP), and rarely found in the procedures such as transurethral resection of bladder tumor (TUR-BT), hysteroscopy, cystoscopy, and arthroscopy. Only a few cases of TURS after TUR-BT have been reported. The patients on maintenance hemodialysis were restricted in the amount of water intake for volume control. They were susceptible to the absorption of irrigation fluid during TUR-BT since they had anuria. We hereby report the 2 cases maintenance hemodialysis patients who were led to TURS after TUR-BT.
정은호 ( Eun Ho Jeong ),공두식 ( Du Sik Kong ),김인현 ( In Hyun Kim ),이경술 ( Kyung Sul Lee ),이건호 ( Gun Ho Lee ),김재홍 ( Jae Hong Kim ),김수진 ( Su Jin Kim ) 대한주산의학회 2003 大韓周産醫學會雜誌 Vol.14 No.4
합지체 기형은 양하지의 일부 혹은 전부의 융합을 특징으로 하는 태아기형으로서 6만명당 1명의 발생률을 가지며 대부분 출생 후 5일 이내 사망한다. 국내문헌에는 임신 20 주 이후 진단한 5예 및 12주에 진단된 1예가 보고 된 바 있으며 보통 임신 이삼분기 이후에 동반되는 심한 양수과 소증으로 진단의 어려움이 있어왔다. 최근 초음파 영상발전과 질초음파 검사의 도입으로 주요 기형을 임신 초기에도 주요 기형의 진단이 가능하게 되었다. 저자들은 양수과소증이 발생하기전인 임신 일삼분기에서 질식 초음파 및 복식 초음파로 척추측만증등을 동반한 합지체 기형의 1예를 진단하여 이를 문헌고찰과 함께 보고하는 바이다. Sirenomelia, characterised by a complete or incomplete fusion of the lower extremities, is a severe form of caudal defect affecting 1 in 60,000 births. Most cases of sirenomelia die within 5days after birth and are associated with abnormalities such as renal genesis, urinary tract agenesis, single umbilical artery, etc. Thirdtrimester ultrasonographic diagnosis is usually impaired by severe oligohydramnios whereas the amount of amniotic fluid may be efficient to allow diagnosis in the late first trimester. We report of a case of sirenomelia at 14 weeks of gestation using prenatal transvaginal and transabdominal ultrasonography.