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Sol-gel derived blue-emitting Sr3MgSi2O8:Eu2+ oxide phosphor for ultraviolet emitting diodes
김진태,황보승,Young-Sun Jeon,강보안,Yu-Sang Kim,황규석 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.4
Blue-emitting divalent europium-activated strontium magnesium orthosilicate (Sr3MgSi2O8 :Eu2+) oxide phosphor was synthesized through a low-temperature chemical solution process using tetraethyl orthosilicate and inorganic salts as starting materials. The transparent sol was preheated at 300 oC for 120 minutes and then the precursor was finally annealed at 900 oC for 240 minutes. Crystallinity, surface morphology and luminescent properties have been investigated. The phosphor emits blue luminescence with a peak wavelength at 457 nm under near-ultraviolet excitation at 365 nm.
영구치(永久齒) 치배형함(齒胚形咸)에 관(關)한 연구(硏究)
김진태,Kim, Jin-Tae 대한소아치과학회 1978 大韓小兒齒科學會誌 Vol.5 No.1
Of 633 children, 334 in male and 299 in female, whose ages ranged from 3 to 13 years old, the amounts of development of teeth germ were observed according to ages with oblique lateral cephalogram to study the developing state of teeth germ of mandibular premolars. The results were as followings; 1. The time of actively develop:ng tooth germ was observed about 10 years old both in male and in female. 2. The increasing rate of development of tooth germ a year was higher in female than in male at mandibular 1st premolar and in male than in female at mandibular 2nd premolar. 3. Age of complete tooth germ development was earlier in female than in male at mandibular 1st and 2nd premolars.
Divinyl Sulfone으로 가교된 히알루론산 마이크로비드의 특성평가
김진태,이득용,장주웅,김태형,장용운,Kim, Jin-Tae,Lee, Deuk Yong,Jang, Ju-Woong,Kim, Tae-Hyung,Jang, Yong-Wun 대한의용생체공학회 2013 의공학회지 Vol.34 No.3
Hyaluronic acid(HA) microbeads were synthesized by dropping the sodium hyaluronate(Streptococcus) solutions in NaOH into a solution mixture of divinyl sulfone(DVS) in 2-methyl-1-propanol, followed by stirring, cleaning and drying process at room temperature. The initial experimental conditions are crosslinking time(CLTi) of 5 h, crosslinking temperature(CLTe) of room temperature, injection air pressure(IAPr) of 5 psi, and DVS concentration( DVSc) of 0.2 vol%, respectively. Then, parametric studies were performed by varying the parameters to investigate the morphology, the porosity, the swelling ratio and the size of the beads. The microbead size pattern was not regular to function of the degree of crosslink. It was observed that the swelling ratio, the degree of crosslink, and the pore size can be controlled by adjusting the CLTi, CLTe and DVSc. Among the parameters investigated, the smallest bead size can be achieved by varying the CLTi parameter. The lowest swelling ratio, as an indication of the highest degree of crosslink, can be obtained by varying CLTe.
김진태,이경준,Kim, Jin-Tae,Lee, Gyeong-Jun 한국전자통신연구원 1986 전자통신 Vol.8 No.2
본고에서는 전전자식 교환기 TDX-1의 국간 신호장치 R2MFC 송수신기의 구성에 관한 내용을 주로 기술하며 이의 성능 분석에 관해 고찰한다. 신호의 검출을 위해 디지틀 신호처리 방식은 여러가지가 있지만 R2MFC 국간 신호의 주파수 특성에 따라 특정 신호주파수의 예민한 응답 특성이 요구되므로 DFT(Discrete Fourier Transform)에 의한 방식으로 괴첼알고리즘을 사용하였으며 이의 실현은 실시간 처리를 위해서 전용의 디지틀 신호처리용 프로세서(UPD7720)를 이용하고 있다. 끝으로 TDX-1의 가입자 신호장치에 대해 개략적으로 기술하였다 .
김진태,임수민,김병수,이득용,최재하,Kim, Jin-Tae,Lim, Sumin,Kim, Byoung Soo,Lee, Deuk Yong,Choi, Jae Ha 대한의용생체공학회 2014 의공학회지 Vol.35 No.6
Collagen scaffolds were synthesized by cross linking into a solution mixture of 1-ethyl-3-[3-dimethylaminopropyl] carbodiimide hydrochlorid(EDC) in ethanol, followed by pressing, cleaning and lyophilization process after the type I atelo-collagen solutions in D.I water(pH3). The experimental conditions are collagen concentration of 1.0 wt%, 3.0 wt%, 5.0 wt% and differential concentration of cross-linker. Then, parametric studies were performed by varying the parameters to investigate the morphology, the porosity, the swelling ratio and the thickness and genotoxicity of the scaffolds. The scaffolds thickness pattern was regular to concentration of the degree of cross-linker and collagen. It was observed that the swelling ratio, the degree of crosslink, and the pore size(thickness of scaffold) can be controlled by adjusting the collagen, crosslinker. Among the parameters investigated, the smallest thickness can be achieved by collagen, crosslinker concentrate condition. The collagen scaffold is induced no genotoxicity. The lowest swelling ratio, as an indication of the highest degree of crosslink, can be obtained by adding crosslink agent.