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$R-{\theta}$ 좌표계에 의한 원자로 압력용기 차폐해석체계 개발
김하용,구본승,김교윤,이정찬,지성균,Kim, Ha-Yong,Koo, Bon-Seung,Kim, Kyo-Youn,Lee, Chung-Chan,Zee, Sung-Quun 대한방사선방어학회 2005 방사선방어학회지 Vol.30 No.1
A new developing reactor isn't fixed the structure and the materials of reactor components. To perform the shielding analysis for a reactor vessel by $R-\theta$ geometry, it takes much effort and time to modeling of source term according to the change of reactor components every time. Therefore, we developed the shielding analysis system for the reactor vessel by $R-{\theta}$ geometry, which wasn't affected by the reactor core geometry. By using the developed shielding analysis system, we performed the shielding analysis for the reactor vessel of an integral reactor which has the hexagonal geometry of nuclear fuel assemblies in reactor core. We compared the results obtained from the developed system with those obtained from MCNP analysis. Because the results of developed shielding analysis system were more conservative than those of MCNP calculation, it is useful for shielding analysis. As we had developed the new shielding analysis system for a reactor vessel by $R-{\theta}$ geometry, we reduced error of model for reactor core which was formerly designed by hand and saved the time and the effort to design source term model of reactor core. 노심 및 원자로의 구조 및 구성 물질이 확정되어 있지 않은 개발단계의 신형원자로의 압력용기에 대한 $R-{\theta}$좌표에서 차폐해석을 수행하려면, 매번 선원항에 대한 모델작업을 하는데 많은 노력과 시간이 소요된다. 따라서 $R-\theta$좌표에 의한 반경방향의 원자로 압력용기에 대한 차폐해석에 있어서 노심의 기하학적 구조에 영향을 받지 않고 해석할 수 있는 체계를 개발하였다. 개발된 해석체계를 이용하여 육방형 노심배열을 갖는 일체형 원자로의 압력용기에 대한 차폐해석을 수행하여, 그 결과를 MCNP 해석결과와 비교 분석하였다. 분석결과 개발된 해석체계가 좀 더 보수적인 결과를 나타내었으며 이는 차폐해석측면에서 타당하다. 또한 이 해석체계를 개발함으로써 그 동안 수작업으로 작성하였던 노심내부에 대한 모델에 대한 오차를 줄일 수 있으며 이에 소요되는 시간 및 노력을 줄일 수 있을 것으로 판단된다.
Modified Stoppa Approach for Surgical Treatment of Acetabular Fracture
김하용,양대석,박창규,최원식 대한정형외과학회 2015 Clinics in Orthopedic Surgery Vol.7 No.1
Background: We analyzed the extent of the comminution in the acetabular weight-bearing area, the clinical and radiographicresults, and the complications after a minimum 2-year follow-up of the modified Stoppa approach for the treatment of acetabularfractures, and we attempted to evaluate the efficacy of the operative technique. Methods: All of the 22 patients, who needed the anterior approach for the treatment of acetabular fractures at our hospital fromNovember 2007 to November 2010, were subjected to surgery via the modified Stoppa approach. Fracture pattern, operative time,blood loss during the operation, quality of reduction, number of bony fragments in the acetabular weight-bearing area, and postoperativecomplications were assessed by retrospectively analyzing the medical records and the radiographic examinations. Theresults after the operation were analyzed based on the criteria of Matta. Results: The clinical results were excellent in 3 cases, good in 13 cases, and poor in 4 cases, while the radiographic results wereexcellent in 5 cases, good in 13 cases, and poor in 2 cases. Although the quality of reduction and the clinical results according tothe extent of comminution were statistically significant (p = 0.03 and p = 0.04, respectively), the radiographic results were not statisticallysignificant (p = 0.74). Conclusions: It can be concluded that the modified Stoppa approach could be used as an alternative to the classic ilioinguinalapproach. In addition, comminution of the acetabular fracture was an important factor causing non-anatomic reduction and finallyunsatisfactory clinical results.
에티오피아 MCM General Hospital을 통해 살펴본 지역주민들의 질병 및 증상 현황
김하용,최정준,김준,장은수,Kim, Hayong,Choi, Jung-jun,Kim, Joon,Jang, Eunsu 대한한의진단학회 2020 大韓韓醫診斷學會誌 Vol.24 No.1
Objectives The aim of this study was to suggest basic data of health and medical status in Ethiopia for globalization of Korean Medicine. Methods This study was conducted from 26 to 28, Dec, 2018 in the MCM General Hospital in Addis ababa of Ethiopia. The questionnaire was developed from open form of review of system questionnaire and some question was changed. It was composed of 3 parts: chief complaint, review of system and medical policy. For more information, we interviewed the director of a public health clinic. The 94 questionnaires was collected. Three of them was incomplete, and 91 was analyzed. Results (1) Seventeen people appealed for head problem, and thirteen people for abdomen, and eleven for chest in chief complaint. (2) The number of 22 people had problem in nervous system. Twenty also had diseases of respiratory and digestive system respectively. (3) They also appeal for pain in head, mouth, eye, and neck and complained for fatigue, weight gain or loss, and weakness in review of system. (4) They put the priority on disease prevention than management or treatment. Conclusions This study suggests information on medical status of the people in the medical hospital of Ethiopia which is valuable for globalization of Korean Medicine.
Gait Analysis of Symptomatic Flatfoot in Children: An Observational Study
김하용,신혁수,고준혁,차용한,안재훈,황재연 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.3
Background: Flatfoot deformity is a lever arm disease that incurs kinetic inefficiency during gait. The purpose of this study was to measure the degree of kinetic inefficiency by comparing the gait analysis data of a flatfoot group with a normal control group. Methods: The patient group consisted of 26 children (21 males and 5 females) with symptomatic flatfoot. They were examined with gait analysis between May 2005 and February 2014. Exclusion criteria were patients with secondary flatfoot caused by neuromuscular disorders, tarsal coalition, vertical talus, or others. Patients’ mean age was 9.5 years (range, 7 to 13 years). The gait analysis data of the study group and the normal control group were compared. Results: The mean vertical ground reaction force (GRF) in the push-off phase was 0.99 for the patient group and 1.15 for the control group (p < 0.05). The mean ankle moment in the sagittal plane during the push-off phase was 0.89 for the patient group and 1.27 for the control group (p < 0.05). The mean ankle power in the sagittal plane during the push-off phase was 1.38 for the patient group and 2.52 for the control group (p < 0.05). The aforementioned results show that patients with pes planovalgus had a reduction of moment, power, and GRF in the push-off phase during gait. Conclusions: Symptomatic flatfeet had a moment inefficiency of 30% and power inefficiency of 45% during gait compared to feet with preserved medial longitudinal arches.