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정진안,박경환,이동훈,김홍건,김유영 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.4
Ce-doped Y3Al5O12 (YAG:Ce) phosphor powder was prepared using a NO3 −-malonic acid-NH4NO3-NH3·H2O system. The YAG:Ce precursor was ignited at 240 oC and the resulting powder contained YAG:Ce crystallites (42%) - active in the visible region at 460 nm - amorphous particles (53%) - inactive at visible wavelengths - and less than 3% oxide (3%) crystallite impurities. The impurities transformed to acitive YAG:Ce crystallites at above 800 oC. At above 1000 oC, the amorphous phase became YAG phase and isolated Ce2O crystallites emerged. The powder particles comprised < 4 μm secondary aggregates of 20 nm primary particles. The thermal dusting of the secondary particles coincided with the aggregation of the secondary particles at above 900 oC.
정진안,양일승,최성모,Chung, Jin-An,Yang, Il-Seung,Choi, Sung-Mo 한국강구조학회 2003 韓國鋼構造學會 論文集 Vol.15 No.3
본 논문은 매립형 SRC기둥의 축력과 변형능력과의 관계를 찾아내기 위하여 해석적인 연구를 수행하였다. 해석 모델은 캔틸레버기둥으로 한정하였으며 SRC 기둥의 비탄성 거동에 영향을 미치는 변수들인 철골비, 매립철골형상과 전단스팬과 춤과의 비에 대하여 검토하였다. 일정회전각하에 축력과 반복수평력을 받는 SRC기둥의 안정적 거동을 보장하기 위한 최대한계축력이 있다는 것을 해석결과들은 보여 주고 있다. 반복 횡하중을 받는 기둥이 저항할 수 있는 최대축력은 소요회전각을 보장하는 안정한계축력으로서 정의된다. 해석결과에 따르면 안정한 계축력비는 강재의 강도가 증가함에 따라 콘크리트의 강도가 감소함에 따라 증가하는 것으로 나타났다. 또한 I형 단면이 매립형 철골로 사용될때 철골 단면적이 증가함에 따라 안정한계 축력비는 증가하며, 십자형 단면이 사용되는 경우에는 단면적에 의한 영향이 거의 없었다. In this paper, an analytical approach hwas been conductsed to clarify the relationships between the axial force and the deformation capacity of steel- encased reinforced- concrete beam-columns. The analytical model was defined as a cantilever. Several parameters influencing the inelastic performance of the beam-columns were selected, as follows: including encased steel area ratios, and sectional shapes of the encased steel, material strengths, and shear-span- to-depth ratios. The Analytical results of the analysis showed that the axial force had to have a maximum limit to ensure the stable behavior of a steel- encased reinforced- concrete beam-column when it was subjected to both axial and repeated lateral loading under a constant rotation angle amplitude. The maximum axial force of the beam-column to be resisted under cyclic lateral loading was defined as the stable-limit axial force to ensure the required rotation angle amplitude. The Analytical results of the analysis indicate that the stable-limit axial load ratio increases as the steel strength increases or as the compressive strength of the concrete decreases. The stable-limit axial load ratio decreases as the encased steel ' s sectional area increases in the case of a 1-shaped sections and it is almost not influenced by the steel sectional area in the case of a cross-shaped section.
주물형 베이스 플레이트를 사용한 합성강관 기둥 노출형 주각의 탄소성 휨거동
정진안,양일승,최성모 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.2
This paper deals with the experimental work with the objective to gain a better understanding of the elasto-plastic behavior of steel-concrete composite column bases under seismic loading. Seven specimens were tested to investigate structural behavior of steel-concrete composite column bases. The specimen consisted of concrete filled steel tube (CFT) column (or steel tube column), reinforced concrete footing beam, high base unit of cast steel and 4 high strength anchor bolts. The following main influential elements were taken into consideration: axial load level and type of column (CFT or empty steel tube, rectangular section or circular section). Specimens were subjected to cyclic seismic lateral loading at the column tops under constant axial load. The cyclic lateral load was applied according to a predetermined sequence of rotation angle cycles of column base. Experimental results verified that the rotation stiffness and flexural strength of CFT column base calculated according to the formulas given by this paper were in coincidence with the test results in cases of lower axial load without reference to the type of column. For the specimens under higher axial load, formulas underestimated their rotation stiffness and flexural strength. The comparison indicates that several modifications should be taken into consideration in column base design formulas of steel structure in order to make effective use of these formulas in CFT column base design, especially for column bases under higher axial load. It is made clear that ultimate flexural strength of this kind column base can be evaluated by ultimate strength with the coefficient of bearing stress of concrete taken into account.
정진안(JA Jung),허민(M Hur),박찬무(CM Park) 대한산부인과학회 1970 Obstetrics & Gynecology Science Vol.13 No.5
The case reported was 36 year old multipara who had had stillbirth and develpoed acute renal failure. Theraphy was initially directed toward the control of the rapidly developed shock and of fluid and electrolyte balance. Five times of peritoneal dialysis were performed because of anuria for more than 48 hours and uremic symptoms. Diuretic phase developed 2 week after the anuric phase. The patient was discharged on the 38th hospital day with good general condition. The causes and the theraphy of the acute renal failure were reviewed.
콘크리트 충전강관 3층 골조의 탄소성 거동에 관한 연구
정진안(Chung. Jin-An),최성모(Choi. Sung-Mo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.7
Three story and one span concrete filled steel tubular frames were tested under the constant axial load and alternately<br/> cyclic horizontal loads in order to investigate the seismic performance of multi story CFT frames. The effects of the<br/> main experimental parameters which were the two column type (vacant column, CFT column), the two beam-to-column<br/> connections (external diaphragm connection type and vertical stiffener connection type) and the two steel shear walls<br/> type are discussed on the elastic-plastic behavior of CFT frames. These results showed that 1st story column of CFT<br/> frames had large ductile, whereas that of vacant steel tube frame were observed local buckling at column top and bottom<br/> and the frame strength decreased rapidly. In addition, it was verified that the vertical stiffener connections had good<br/> structural performance and steel shear wall was an effective device to improve strength and stiffness.