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안병권,정소원,김지혜,정영래,김선범,Ahn, Byoung-Kwon,Jung, So-Won,Kim, Ji-Hye,Jung, Young-Rae,Kim, Sun-Bum 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.3
Recently supercavitating underwater torpedo moving at high speed (over 200 knots) has been interested for their practical advantage of the dramatic drag reduction. Cavitator located in front of the torpedo plays an important role to generate a natural supercavity and control the motion of the object. Supercavity can be created artificially by injection of compressed gas from the rear of the cavitator at a relatively low speed. In this paper, we investigated physical characteristics of artificial supercavities through cavitation tunnel experiments. One of the main focuses of the study was to measure pressure inside the cavity, and examined variation of the gravity effects appearing according to different amount of injected air. It was also found that a stable supercavity could be sustained at injection rates less than that required to form the stable supercavity because of hysteresis effect.
Experimental and numerical studies on super-cavitating flow of axisymmetric cavitators
안병권,이창섭,김형태 대한조선학회 2010 International Journal of Naval Architecture and Oc Vol.2 No.1
Recently underwater systems moving at high speed such as a super-cavitating torpedo have been studied for their practical advantage of the dramatic drag reduction. In this study we are focusing our attention on super-cavitating flows around axisymmetric cavitators. A numerical method based on inviscid flow is developed and the results for several shapes of the cavitator are presented. First using a potential based boundary element method, we find the shape of the cavitator yielding a sufficiently large enough cavity to surround the body. Second, numerical predictions of supercavity are validated by comparing with experimental observations carried out in a high speed cavitation tunnel at Chungnam National University (CNU CT).
직장암에 대한 수술 전 방사선-화학요법 적용시 통상적인 영상진단 검사로 충분한가?
안병권 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.1
Background : Recently, preoperative chemoradiation has been accepted to control locally advanced rectal cancer according to increasing the anal sphincter preservation, improving the resectability and survival. However, patient selection of preoperative chemoradiation should be done carefully, because distant metastasis or peritoneal seeding of cancer was found in some patients during interval between preoperative chemoradiation and surgery, or in surgery or at immediate postoperative period. Methods : We reviewed a total of 139 patients who were treated by preoperative chemoradiation between January, 1995 and December, 2004, all of them had locally advanced rectal cancer. In work-up study for preoperative chemoradiation, no distant metastasis was proven by chest x-ray, abdominal and pelvic CT. All patients received the full scheduled dose of radiation (range, 4500- 5500 cGy). The radiation was administered in divided tractions over a five-week period. 5flurouracil (450 mg/㎡/day) and leucovorin (20 mg/㎡/day) were administered continuously on day 1-5 and 19-33. Interval between preoperative chemoradiation and surgery was within 48 weeks. Before surgery, all patients underwent chest x-ray, liver ultrasonography and pelvic CT to do restaging. Results : One lung metastasis, 1 inguinal lymph node metastasis, and 1 bone metastasis were identified by restaging period. Three hepatic metastasis, 1 peritoneal seeding, 5 paraaortic lymph node metastasis were identified in operation field. Two bone metastases were identified at immediate postoperative period within 3 months. The 3 patients with bone metastasis complained of shoulder pain or back pain and all of bone metastases were identified by bone scan. As a result, 14 patients(10.1%) were inadequately included to preoperative chemoradiation with conventional imaging study. All of them died within one and a half year. Conclusions : In conclusion, in order to select preoperative chemoradiation adequately in locally advanced rectal cancer, it seems that specific imaging study is necessary to confirm liver metastasis or peritoneal seeding of cancer precisely. In addition, bone scan is mandatory to work-up of preoperative chemoradiation, if patient complained of shoulder or back pain.
안병권,최현숙,고하영,최두복 조선대학교 공학기술연구원 2014 공학기술논문지 Vol.7 No.1
The objective of this research was to study L (+)-lactic acid production byrepeated batch culture of Rhizopus arrhizus RA 128 using broken rice as sole carbonsource. The L (+)-lactic acid production increased with the increase of broken riceconcentration by 60g/L. L (+)-lactic acid production was increased from 10.9 to 25.3g/Lwhen pH was increased from 4.0 to 6.0. However, over 7.0 of pH, it was decreased. TheL (+)-lactic acid productivity and cell concentration increased with the increase intemperature from 29 to 35 ℃. The maximum L (+)-lactic acid production and cellconcentration was found with the 1.5% of CaCO3. Repeated batch culture was successfullyperformed for 4cycles for 12 days. All cycles showed that 234.5g/L of broken rice wasconsumed. 75g/L of total L (+)-lactic acid was obtained after 288hr. These results showthat broken rice can be useful for the effective production of L (+)-lactic acid in therepeated batch culture of R. arrhizus RA 128.
점성 및 비점성 해석법을 이용한 초월공동 유동 수치해석
안병권,김지혜,최정규,김형태,나영인,이도형,Ahn, Byoung-Kwon,Kim, Ji-Hye,Choi, Jung-Kyu,Kim, Hyoung-Tae,Nah, Young-In,Lee, Do-Hyung 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.1
Recently supercavitating torpedo has been studied because of its high-speed performance as the next generation of underwater weapon systems. In this study, we present a numerical method based on the potential flow. Characteristic features of the shape of supercavities and drag forces are investigated. In addition, we introduce a viscous-potential method to compensate for the effects of viscosity. The results are compared with viscous calculations using a commercial package, FLUENT V13.