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박민우(Min-Woo Park),이경태(Gyung-Tae Lee),장신애(Shin-Ae Jang),이지훈(Jihoon Lee) 전남대학교 어업기술연구소 2013 어업기술연구소보고지 Vol.6 No.1
Netting accounted for the biggest part of fishing gear and culture facilities are very flexible and heavily influenced by Hydrodynamic forces. Furthermore, Hydrodynamic forces on the netting are changed according to current, attack angle, material and others. So, It must be accurately decided to calculate the hydrodynamic forces on fishing gears in connection to drag coefficient and lift coefficient. This study is a basic research to establish the hydrodynamic coefficients. For this study, he tests at the flume tank were performed to measure the hydrodynamic forces for the 8 kinds of nettings, which have different mesh size, but the same total projected area with the same twine thickness. In order to establish the standardized hydrodynamic coefficients of the nettings, the coefficients were derived according to Reynolds number. The range of attack angle on net is 0~90° in the 15° interval. Flow velocity range is 0~1.0㎧ in the 0.2㎧ intervals. The results of the nettings tests were as follows; 1. Drag coefficient was influenced by Reynolds number. 2. Lift coefficient was not nearly influenced by Reynolds number. 3. The experiments were carried out with a relatively narrow range of Reynolds number(784-1960). Therefore, it did not clearly identify the changing pattern. In order to figure out a basic data for more efficient and safe fishing gear’s design, further experiments will be needed regarded to a large range of Reynolds number.
십이지장 궤양에 의한 유문 협착에서 풍선 확장술의 장기 효과
이상우,김남재,서승원,이승민,이병석,정현용,양현웅,성재규,임의혁,이경태 대한소화기내시경학회 2000 Clinical Endoscopy Vol.21 No.5
Background/Aims: Balloon dilatation is a useful alternative to surgery in patients with benign pyloric stenosis. However, little data are available on the long-term outcome of the procedure. This report was attempted to determine the safety and efficacy of endoscopic balloon dilatation for 14 patients with gastric outlet obstruction caused by duodenal ulcer. Methods: Review of medical records or telephone interview was performed retrospectively. Results: Follow-up was conducted for median 18.5 months (3-48 months). Gastric outlet strictures had a median diameter 6 mm (range, 2-9 mm). Five (35.7%) patients had active ulcer. 12 mm to 18 mm balloons were inflated a median of 1 times (range, 1-4 times) for a median of 4 minutes (range, 1 11 minutes). Thirty-two procedure (1.5/patient) were performed; 9 patients (64.3%) had one treatment and 5 patients (35.7%) had multiple treatment. Immediate symptomatic relief was achieved in 13 patients (92.8%) and 7 patients (50%) achieved sustained symptomatic relief. Dilatation failed only in 2 patients (14.3%) ultimately and both recovered by palliative bypass surgery. No complication was noted during treatment. Conclusions: Endoscopic balloon dilatation is safe and effective for most patients with gastric outlet obstruction induced by duodenal ulcer. And due to limitation of retrospective aspect of this report, further prospective, randomized studies must be performed.