http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
백정민 ( Jeong Min Baik ) 한국센서학회 2014 센서학회지 Vol.23 No.5
Here, we review the various methods for the preparation of vanadium dioxide (VO2) films and nanowires, and their potential applications to the sensors such as gas sensor, strain sensor, and temperature sensor. VO2 is an interesting material on account of its easily accessible and sharp Mott metal-insulator transition (MIT) at ~68°C in the bulk. The MIT is also triggered by the electric field, stress, magnetic field etc. This paper involves exceptionally sensitive hydrogen sensors based on the catalytic process between hydrogen molecules and Pd nanoparticles on the VO2 surface, and fast responsive sensors based on the self-heating effects which leads to the phase changes of the VO2. These features will be seen in this paper and can enable strategies for the integration of a VO2 material in advanced and complex functional units such as logic gates, memory, FETs for micro/nano-systems as well as the sensors.
스마트 인솔 내의 마찰 대전 나노발전기의 인체공학적 설계 및 특성 연구
김경남(Kyeong Nam Kim),이성호(Sung-Ho Lee),이성철(Sung Chul Lee),백정민(Jeong Min Baik) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.11
We study the triangular prism supporter based triboelectric nanogenerator (TENG) for enhancing the uniformity of contact and separation by considering the human walking style under human walking. The supporter based TENG generates the output voltage and current of 64 V and 55 μA under walks, showing an enhancement of about 600 %, compared with the flat TENG.
박정서,김신종,백운필,이현주,송윤석,장정민 明知大學校 自然科學硏究所 1997 자연과학논문집 Vol.15 No.-
Biphenyl의 para position에 methylene group을 도입 시키는 방법으로 paraformaldehyde와 dimethylamine을 반응시켜 Mannich Base인 (1,1'-biphenyl-4,4'-dimethyl)-dimethli amine을 합성해 보았으나, 전혀 반응이 진행되지 않았다. 즉 , Biphenyl에 강한 activating group이 없으므로 Mannich Base을 사용한 방법은 효과적이 못된다. 따라서, 다른 방법으로 biphenyl에 bromomethylation을 진행 시켜서, 두 개의 methylene group을 도입시켰다. Bromomethylation은 다음과 같이 사용하는 시약 및 실험 방법 등을 고려하여 3가지 방법으로 시도 하였다. 1)1,3,5-trioxane + HBr in AcOH + paraformaldehyde 사용법, 2)Hbr in AcOH + paraformaldehyde 사용법, 3) NaBr + H₂SO₄+paraformaldehyde 사용법, 이상의 3가지 방법 중에서 NaBr+ H₂SO₄+ paraformaldehyde 사용법이 가장 좋은 결과를 얻었다. 이러한 system에서 반응을 진행시킨 결과 69% 의 높은 수율 (87%의 purity)로 4,4'-dibromomethylbiphenyl 합성에 성공할 수 있었다. The synthetic method for the induction of methylene group on the para position of arenes is of importance. Since the weak activation effect of phenyl group on the electrophilic substitution reaction, the induction of methylene group by way of Mannich base using paraformaldehyde and dimethylamine was unsuccessful. It was found that halomethylation of byphenyl is only the way for the preparation of di-p-methylenebiphenyl. Especially, bromomethylation was turn out to be more reliable synthetic method than chloromethylation. Herein, we developed 3 protocols for the synthesis of 4,4'-dibromomethylbiphenyl. In addition, the best result was obtained using NaBr + H₂SO₄paraformaldehyde protocol in 69% yield.