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축력과 양단 대칭모멘트를 받는 이중곡률 스테인리스 각형강관 보-기둥의 좌굴내력에 관한 실험적 연구
류기표 ( Ki Pyo Ryu ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.1
This stud is a series of experimental investigation on the buckling strengths of eccentrically compressed cold-formed stainless steel square hollow section beam-columns. The principal parameters in this study are slenderness ratios(Lk/r = 30, 50, 70) and magnitude of eccentricity e(one way : 0, 25, 50, 75, 100 mm, the other way : 0, 12.5, 25, 37.5, 50 mm) on the symmetrical end-moment of a double curvature. Objectives of this paper are to obtain the maximum loads by performing an experimental work and to compare the experimental behaviors with analytical results. The ultimate buckling strength of square section members are evaluated by a numerical method in accordance with the bending moment-axial force(M-P) interaction curves. The behavior of each specimen is displayed in the form strength-displacement and moment-angle(M-θ) relationship. The numerically obtained ultimate buckling interaction curves of beam columns show a reasonably good agreement with the available experimental results of slenderness ratios 30 and 50. But experimental results of slenderness ratios 70(e/k= 0) were below M-P interaction curve.
축력과 양단 비대칭모멘트를 받는 단일곡률 스테인리스 각형강관보-기둥의 좌굴내력에 관한 실험적 연구
장호주(Jang Ho-Ju),류기표(Ryu Ki-Pyo),박재선(Park Jae-Seon),양영성(Yang Young-Sung) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.6
This study is a series of experimental investigation on the buckling strengths of eccentrically compressed cold-formed stainless steel rectangular hollow section beam-columns. The principal parameters in this study are slenderness ratios(Lk/r=30, 50, 70) and magnitude of eccentricity e(one way : 0, 25, 50, 75, 100㎜, the other way : 0, 12.5, 25, 37.5, 50㎜) on the asymmetrical end-moment of a single curvature. Objectives of this paper are to obtain the maximum loads by performing an experimental work and to compare the experimental behaviors with analytical results. The ultimate buckling strength of square section members are evaluated by a numerical method in accordance with the bending moment-axial force(M-P) interaction curves. The behavior of each specimen is displayed in the form strength-displacement and moment-angle(M- θ) relationship. The numerically obtained ultimate buckling interaction curves of beam columns show a reasonably good agreement with the available experimental results of slenderness ratios 30 and 50. But experimental results of slenderness ratios 70(e/k=0, 1.5) were below M-P interaction curve.
축력과 양단 비대칭모멘트를 받는 단일곡률 스테인리스 원형강관 보-기둥의 좌굴내력에 관한 실험적 연구
장호주(Jang Ho-Ju),류기표(Ryu Ki-Pyo),박재선(Park Jae-Seon),양영성(Yang Young-Sung) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.5
This study presents a series of experimental investigations on buckling strength of eccentrically compressed cold-formed stainless steel CHS(circular hollow section) columns. The principal parameters in this study are slenderness ratios(Lk/r = 30, 50, 70) and magnitude of eccentricity e(one way : 0, 25, 50, 75, 100㎜, the other way : 0, 12.5, 25, 37.5, 50㎜) for single-curvature asymmetrical end moment. Objectives of this study are to obtain the maximum loads by performing an experimental work and to compare the experimental behaviors with analytical results. The ultimate buckling strength of CHS members is evaluated by a numerical method for axial force-bending moment(P-M) interaction curves. The behavior of each specimen is displayed in the form of strength-displacement and moment-angle(M-θ) relationship. The numerically obtained ultimate buckling interaction curves of beam-columns show a reasonably good agreement with the available experimental results for slenderness ratio 30. But experimental results for slenderness rations 50, 70 were below M-Pinteraction curve.
[ I - 123 ] IPT SPECt를 이용한 정상인과 파킨슨환자의 도파민 운반체의 영상화 및 단순화된 정량분석 방법들의 비교연구
문대혁(Dae Hyuk Moon),양승오(Seoung Oh Yang),이희경(Hee Kyung Lee),김희중(Hee Joung Kim),류진숙(Jin Sook Ryu),천준홍(Jun Hong Cheon),임주혁(Joo Hyuck Im),봉정균(Jung Kyun Bong),남기표(Ki Pyo Nam),권수일(Soo Il Kwon) 대한핵의학회 1996 핵의학 분자영상 Vol.30 No.3
N/A The purpose of this study was to compare the specific binding ratio method with model based methods in estimating the transporter parameter k3/k4 in normal controls and Parkinson's patients with [I-123]IPT SPECT and to evaluate the usefulness of [I-123]IPT SPECT. 6.5±1.1 mCi (239.0±40.3 MBq) of [123]IPT was intravenouly injected as a bolus into six normal controls(age:45±13) and seventeen patients(age:55±8) with Pakinson's disease(PD). The transporter parameter k3/k4 was derived using the Ichise's graphical method(Rv) and Lassen's area ratio method(RA) for the dynamic IPT SPECT data without blood samples. Then, the relationships between the transporter parameter Rv, RA and the ratio of (BG-OCC)/OCC at 115 minutes were evaluated by linear regression analysis. Rvs by Ichise's graphical method for NC and PD were 2.08±0.29 and 0.78±0.31, respectively. RAs by Lassen's area ratio method for NC and PD were 1.48±0.16 and 0.65±0.24, respectively. The correlation coefficients between (BG-OCC)/OCC and Rv, (BG-OCC)/OCC and RA, and RV, and RA were 0.93, 0.90, 0.99 and their corresponding slopes were 0.54, 0.34, and 0.65,respectively. The Rv and RA of NC were significantly higher than the ones of PD. That is, the k3/k4 Of NC was clearly separated from the one of PD. k3/k4 showed a good correlation with the ratio of (BG-OCC)/OCC. The results indicate that the noninvasive simplified quantitative methods may be useful to measure the transporter parameter k3/k4 and the specific binding ratio method can be used for quantitative studies of dopamine transporter with [I-123]IPT SPECT in humans brains.