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전산화단층영상을 이용한 이상적 임플란트 수복 위치에 따른 상악 전치부 치조제의 새로운 분류
박영상,조상춘,김경남,김광만,최성호,문홍석,이용근 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.5
전산화단층영상을 이용한 이상적 임플란트 수복 위치에 따른 상악 전치부 치조제의 새로운 분류
Inversion Barriers of Methylsilole and Methylgermole Monoanions
박영상,고영춘,손홍래 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.12
Density functional MO calculations for the methylsilole anion of [C4H4SiMe]− and methylgermole anion of [C4H4GeMe]− at the B3LYP (full)/6-311+G* level (GAUSSIAN 94) were carried out and characterized by frequency analysis. The ground state structure for the methylsilole anion and methylgermole anion is that the methyl group is pyramidalized with highly localized structure. The difference between the calculated Cα-Cβ and Cβ-Cβ distances are 9.4 and 11.5 pm, respectively. The E-Me vector forms an angle of 67.9o and 78.2o with the C4E plane, respectively. The optimized structures of the saddle point state for the methylsilole anion and methylgermole anion have been also found as a planar with highly delocalized structure. The optimized Cα-Cβ and Cβ-Cβ distances are nearly equal for both cases. The methyl group is located in the plane of C4E ring and the angle between the E-Me vector and the C4E plane for the methylsilole anion and methylgermole anion is 2.0o and 2.3o, respectively. The energy difference between the ground state structure and the transition state structure is only 5.1 kcal mol−1 for the methylsilole anion. However, the energy difference of the methylgermole anion is 14.9 kcal mol−1, which is much higher than that for the corresponding methylsilole monoanion by 9.8 kcal mol−1. Based on MO calculations, we suggest that the head-to-tail dimer compound, 4, result from [2+2] cycloaddition of silicon-carbon double bond character in the highly delocalized transition state of 1. However, the inversion barrier for the methylgermole anion is too high to dimerize.
박영상,권오언,조현성,손재범 대한의용생체공학회 2020 의공학회지 Vol.41 No.1
Recently, there have been many research on fever management using u-healthcare technology. Especially, fever of infants requires continuous monitoring of body temperature by parents. For infants between 4 weeks and under 5 years old, it is recommended to use an electronic thermometer or chemical thermometer in the axilla, or to use an infrared thermometer. However, in order to overcome the reality of not being able to waste significant time on continuous monitoring, there have been demands of patch type thermometers with the internet of things (IoT) and wireless communication technologies. Existing IoT thermometers are difficult to attach to infants’ body because they do not take into account its size, and their interoperability is not guaranteed because they do not comply with standards in communication. Therefore, in this study, a patch-type thermometer with a diameter of 20 mm and a weight of 2.9 g was developed to manage the fever of infants, while it communicates wirelessly with Bluetooth Low Energy (BLE) communication protocol and complies with IEEE 11073 PHD(Personal Health Device) at the same time. We verified its performance under the requirements of thermometers regulated by the Korean Ministry of Food and Drug Safety.