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사각형 단면을 갖는 수직부재와 접합되는 슬래브의 탄성 유효보폭
최정욱,송진규,최기봉 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.1
An effective beam width model, in which the actual slab is replaced with a beam element, is commonly used in design to model the lateral load response of fiat plate structures In tins model, the beam element has a thickness equal to that of the slab, and an effective beam width equal to some fraction of the slab transverse width Many techniques to obtain the effective beam width based on elasticity have been proposed However, the application of these methods are limited to the slab connected to the columns A parametric study on slab-vertical member connected is performed using a finite element technique In the study, a vertical member's rectangularity, whose effects have been commonly Ignored in previous studies, is mainly considered. Based on the numerical results, the methods for calculating the elastic effective beam width of the slab connected to vertical members, including structural walls, with various rectangular cross-section are developed The proposed methods can more precisely predict the lateral stiffness of flat plate structure" than previous analysis methods
근관형성 후 동통에 대한 수산화칼슘의 효과에 관한 연구
남욱,박상혁,최기운 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.2
본 연구는 치성 동통을 보이는 치아의 수산화칼숨의 사용 여부에 따른 동통 감소 효과를 판단하고자 시행하였다. 2003년 12월부터 2004년 9월 사이에 경희대학교 치과대학 부속 치과병원 치과보존과에 치성 동통으로 내원한 환자 213명으로부터 근관형성을 시행한 237개의 치아를 대상으로 환자의 성별 및 연령, 치료부위, 재근관 치료의 여부, 치수의 상태, 술전 치아 상태와 술전 동통의 정도를 기록하였다. 수산화칼슘을 적용하지 않은 군 (1군)과 수산화칼슘을 적용한 군 (2군)으로 분류하였다. 환자들에게 설문지를 배분하여 다음 내원시 치료 후 4시간, 2일 및 7일에 술후 동통의 발생 여부와 동통의 정도를 기록하도록 하였다. 수집한 자료들은 Chi-square analysis (p<0.05)를 사용하여 비교, 분석한 결과 근관내 약제로써 수산화칼슘은 술후 동통을 예방하거나 감소시키는 효과를 가지고 있지 않다는 것을 알 수 있었다. The purpose of this clinical study is to assess whether calcium hydroxide as an intracanal medication affects post-treatment pain in teeth especially odontogenic pain which comes from inflammation of the pulp and periradicular tissues when compared with no intracanal medication. From 213 patients who has been treated 237 root canals due to significant pain (moderate-to-severe), we recorded their age, sex, treated tooth, degree of pain, pre-operative states of the tooth. We classified patients into 2 test group: Group 1 (not gain intracanal Ca(OH)_(2)), Group 2 (gain intracanal Ca(OH)_(2)). Through the survey from the patients, we let them write down the occurrence and degree of post-treatment pain in 4hours, 2days, 7days after treatment as none. mild, moderate or severe. The followings were evaluated: the overall incidence of flare-ups, the overall incidence of post-treatment pain in each group at each time period, the incidence of post-treatment pain in each group at each time period as related to pre-operative states of the teeth. These were compared statistically with Chi-square analysis (p < 0.05). Under the condition of this investigation, no difference was observed in the incidence of post-treat-ment pain between the two groups. Therefore, Ca(OH)_(2)as intracanal medication had no effect on preventing or decreasing the post-treatment pain.
Rankine 반형체를 이용한 트랙터-트레일러의 항력감소장치에 관한 연구
이봉준,남기욱 한국항공대학교 1988 論文集 Vol.26 No.-
트렉터-트레일러 차량의 공기역학적 항력을 감소시킬 목적으로 Rankine반형체를 이용하여 Modified roof-fairing (MRF)과 Sub-trailer(ST)를 개발하였다. 이 항력감소장치들이 차량의 항력특성에 미치는 영향을 조사하기 위하여 트랙터-트레일러의 1/30 축소모형에 대해 ??의 레이놀즈수 영역과 -10˚∼ +10˚의 yaw각 범위에서 풍동실험을 실시하였다. 실험결과 가장 효율적인 항력감소장치는 3차원 형상의 Modified roof-fairing 으로서 yaw 각이 0˚일 때 32%의 항력감소를 나타내었으며, Sub-trailer는 장치의 길이가 길수록 좋은 항력감소 효과를 얻을 수 있었다. 각 항력감소장치들은 레이놀즈수의 변화보다 yaw각의 변화에 더 큰 영향을 받음을 알 수 있었다. Modified roof-fairing and sub-trailer using the shape of Rankine half-body were developed to decrease the aerodynamic drag of a tractor-trailer truck. A wind-tunnel investigation was conducted to determine the influence of these drag reduction devices on the drag characteristics of a tractor-trailer. The measurement were made on a 1/30th scale model at Reynolds number range of ?? and yaw angle range of -10˚∼ +10˚. The 3-dimensional modified roof-fairing which was found to be the most effective drag reduction device results in 32% reduction at zero yaw drag coefficient. Sub-trailer is more effective as the length of the sub-trailer increases. The drag reduction devices were more affected by the variation of yaw angles and the variation of Reynolds numbers.
박춘식,장정욱,유기재,최성민 國立 昌原大學校 産業技術硏究所 2002 産技硏論文集 Vol.16 No.-
This Study investigated a possibility of lateral movement in the reconstruction field of Nongso bridge at Nongso-ri, Joochon-myeon, Kimhae. The methods applied in this study were the judgement formula and the Finite Element Method(FEM). The conclusions are shown in the following. 1) The application of the FEM, as well as the judgement formula resulted in the lateral movement. 2) Bridge abutment and foundation must be constructed after completing consolidation. 3) The occurrence possibility of lateral movement should be judged by the FEM that can re-present field conditions. 4) Lateral movement will take place in the case. Hence, settlement of proper countermeasure method should be followed by the construction.
광섬유 집합체 센서를 이용한 6MV 광자선의 반음영 및 심부선량백분율 측정
신상훈,장경원,조동현,유욱재,서정기,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, a fiber-optic bundle sensor has been developed using water-equivalent organic scintillating fibers for photon beam measurement. Beam penumbra and percent depth doses(PDD) are measured according to the depth of the photon beam. This sensor has many advantages such as high resolution, real-time measurement and ease of calibration over conventional radiation measurement devices.
광섬유 방사선 센서와 EBT 필름을 이용한 심부선량 백분율 측정 및 비교
조동현,장경원,유욱재,신상훈,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, fiber-optic sensor is fabricated to measure PDD of CLINAC. As a scintillating light generated by a high energy X-ray from the medical LINAC is measured using photo diode amp system, It is expected that a high-resolution, real-time fiber-optic dosimeter for medical LINAC can be developed.