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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.
유치(乳齒) 치근(齒根) 흡수(吸收)에 관(關)한 연구(硏究)
김진태,Kim, Jin-Tae 대한소아치과학회 1977 大韓小兒齒科學會誌 Vol.4 No.1
178 naturally exfoliated maxillary deciduous central incisors, 149 deciduous lateral incisors of children at exfoliation stage were studied on the degree and the tendency of the root resorption, and the age of exfoliation of the deciduous central and lateral incisors. The results were as follows; 1. The root of maxillary deciduous central and lateral incisors tended to be resorbed disto-lingually. 2. The age of exfoliation of maxillary deciduous central incisor was 7.27 year in male, 7.01 year in female, and the age of exfoliation of maxillary deciduous lateral incisor was 8.22 year in male, 7.77 year in female. 3. The exfoliation age of maxillary deciduous central and lateral incisors was earlier in female than in male.
김진태,이계한,Kim, Jin-Tae,Lee, Gye-Han 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.5
Flow visualization technique incorporating photochromic dye is used to study the flow characteristics of the gravity driven laminar wavy film. The film thickness and wave speed are successfully measured by flow visualization. As the inclination angle increases, the waves have higher peaks and lower substrate thickness. The measured cross stream velocity at the free surface is up to 10% of stream wise velocity, which shows enhanced mixing in the lump of the film. The measured stream wise velocity profiles are close to parabolic profile near the substrate and the peak but show significant velocity defect near the rear side of the wave. The measured wall shear rate distributions show good agreement with the previous workers' numerical results.
김진태,김성일,정연호,Kim, Jin-Tae,Kim, Sung Il,Joung, Yeun-Ho 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.3
In this paper, we present a MEMS (micro-electro-mechanical system) implantable blood pressure sensor which has designed and fabricated with consideration of size, design flexibility, and wireless detection. Mechanical and electrical characterizations of the sensor were obtained by mathematical analysis and computer aided simulation. The sensor is composed of two coils and a air gap capacitor formed by separation of the coils. Therefore, the sensor produces its resonant frequency which is changed by external pressure variation. This frequency movement is detected by inductive coupling between the sensor and an external antenna coil. Theoretically analyzed resonant frequency of the sensor under 760 mmHg was calculated to 269.556 MHz. Fused silica was selected as sensor material with consideration of chemical and electrical reaction of human body to the material. $2mm{\times}5mm{\times}0.5mm$ pressure sensors fitted to radial artery were fabricated on the substrates by consecutive microfabrication processes: sputtering, etching, photolithography, direct bonding and laser welding. Resonant frequencies of the fabricated sensors were in the range of 269~284 MHz under 760 mmHg pressure.
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,조명철,전국진,박광호,허종기,Kim, Jin-Tae,Cho, Myung-Chul,Jeon, Kug-Jin,Park, Kwang-Ho,Huh, Jong-Ki 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.2
Impacted third molars of the mandible are generally found at or close to the second molar. If the third molar is impacted far distant from its original site, it may be affected by cysts or tumors. Ectopic impaction of third molar in the condyle area is very rare. Furthermore, impaction without cystic lesion is even less common. The etiology of migration of the mandibular third molar without cystic lesion is unknown. So periodical X-ray taking is essential.
김진태,이준하,Kim, Jin-Tae,Lee, Jun-Ha 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.1
짧은 바깥쪽 탄소 나노튜브를 가진 이중벽 탄소 나노튜브 공진기의 경우, 자유로운 끝은 긴 안쪽 벽의 진동에 중요한 역할을 한다. 짧은 안쪽 탄소 나노튜브를 가진 이중벽 카본 나노튜브 공진기의 경우, 안쪽은 부드러운 코어로 작동하여 기본 주파수가 이들의 길이에 의해 영향을 받는다. 본 논문에서는 서로 다른 길이를 가지고 나노튜브로 구성된 이중벽 탄소 나노튜브 공진기의 주파수 변화를 분석한다. 분석 결과, 안쪽 혹은 바깥쪽 탄소 나노튜브 길이를 제어하는 다양한 주파수 소자를 구현하는데 널리 응용될 수 있을 것으로 판단된다. For a double-walled carbon nanotube resonator with a short outer nanotube, the free edge of the short outer wall plays an important role in the vibration of the long inner nanotube. For a double-walled carbon nanotube resonator with a short inner nanotube, the short inner nanotube can be considered as a flexible core, thus, the fundamental frequency is influenced by its length. In this paper, we analysis frequency variation in ultrahigh frequency nanomechanical resonators based on double-walled carbon nanotubes with different wall length. This results will widely apply to the realization of frequency devices controlling the length of the inner or outer nanotube.