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압전박막을 이용한 감압전장효과 트랜지스터 ( PSFET ) 의 동작특성
남기홍 ( Ki Hong Nam ),손병기 ( Byung Ki Sohn ),조병욱 ( Byung Woog Cho ),양규석 ( Gyu Suk Yang ),군대혁 ( Dae hyuk Kwon ) 한국센서학회 1995 센서학회지 Vol.4 No.2
A new FET type semiconductor pressure sensor (FSFET : pressure sensitive field effect transistors was fabricated and its operational characteristics were investigated. A ZnO thin film as a piezoelectric layer, 5000Å thick, was deposited on a gate oxide of FET by RF magnetron sputtering. he deposition conditions to obtain a axis poling structure were substrate temperature of power of 140watt, and working pressure of 5mtorr in Ar ambience. The fabricated PSFET den-ice showed good linearity and stability in the applied pressure range(1x10^5 Pa∼4x10^5 Pa)
박기철,남기홍,김기완,Park, Ki-Cheol,Nam, Ki-Hong,Kim, Ki-Wan 대한전자공학회 1989 전자공학회논문지 Vol. No.
The image sensitive PbO photoconductive films were fabricated ar several deposition conditions such as $O_2$ gas pressure, deposition rate, and substrate temperature. And the effects of these deposition condition on the structural and electrical properties of them were investigated with the aid of scanning electron photomicrographs. X-ray diffraction patterns, and current-valtage chatacteristics. The results show that when PbO film has red tetragonal structure and its dominant orientations are <110> and <010> direction, photocurrent-darkcurrent ratio and light transfer ratio are increase. 영상감지막으로 사용되는 PbO광도전막을 산소압, 증착속도 및 기판온도 등의 조건을 변화시켜 가면서 유도성가열증착법으로 제조하였다. 이 때 증착조건이 PbO막의 구조적 및 전기적 특성에 미치는 영향을 SEM사진, X선회절도 및 전류-전압특성 등을 통해 조사 하였다. 이 결과로 부터 정방정계의 구조의 적색PbO가 <110> 및 <101> 방향으로 우세하게 성장할 때 광전류대 암전류의 비와 광전변환률이 증가함을 알 수 있었다.
식물의 감수분열에서 상동 재조합 효소 특이 기능의 연구현황 및 전망
정유진,남기홍,김태성,이인혜,조용구,강권규,Jung, Yu Jin,Nam, Ki Hong,Kim, Tae Sung,Lee, In Hae,Cho, Yong-Gu,Kang, Kwon Kyoo 한국식물생명공학회 2018 식물생명공학회지 Vol.45 No.1
Meiosis is a specialized cell division, essential in most reproducing organisms to halve the number of chromosomes, thereby enabling the restoration of ploidy levels during fertilization. A key step in meiosis is homologous recombination, which promotes homologous pairing and generates crossovers (COs) to connect homologous chromosomes until their separation at anaphase I. These CO sites, seen cytologically as chiasmata, represent a reciprocal exchange of genetic information between two homologous non-sister chromatids. RAD51, the eukaryotic homolog of the bacterial RecA recombinase, plays a central role in homologous recombination (HR) in yeast and animals. Loss of RAD51 function causes lethality in the flowering plant, Arabidopsis thaliana, suggesting that RAD51 has a meiotic stage-specific function that is different from homologous pairing activity.
Synthesis of Damascones and Related Flavoring Compound : ${\bdta}$-Damascone
이우영,박정미,남기홍,장세영,박외숙,Lee Woo Young,Jung Mee Park,Ki Hong Nam,Se Young Jang,Oee Sook Park Korean Chemical Society 1986 대한화학회지 Vol.30 No.5
방향을 지니는 천연물인 베타다마스콘(I)을 2,2,6-트리메틸시클로헥산온(II)으로부터 출발하여 합성하였다. 아세틸렌의 THF포화용액을 2차 부틸리튬으로 처리하여 얻은 모노아세틸화 음이온을 -78${\circ}C$에서 (II)와 반응시켜 에틴일하고, 이 때 생긴 에틴일카르비놀(III)을 옥살산 또는 포름산과 함께 끓여서 이성질화시켜 일종의 아세틸시클로헥산(IV)을 얻었다. (IV)를 2차 부틸리튬으로 처리하여 생성되는 엔올화 음이온을 잘 건조시킨 아세트알데히드와 반응시켜서 생성되는 베타히드록시케톤(V)을 파라톨루엔술폰산으로 탈수하여 트란스-2,2,6-트리메틸-1-크로톤일-1시글로 헥센, 즉 다마스콘(I)을 합성하였다. The synthesis of $\beta-damascone$ (I), an odoriferous natural product, was investigated from 2,2,6-trimethylcyclohexanone (II); (II) was ethynylated by the action of monoacetylide anion prepared from acetylene and sec-butyllithium at -78${\circ}C$, to give an ethynylcarbinol(III), which was isomerized to an acetylcyclohexene(IV) by refluxing in aqueous oxalic or formic acid. (IV) was treated with sec-butyllithium, the enolate was reacted with freshly dried acetaldehyde, and the resultant $\beta-hydroxyketone$ (V) was dehydrated by TsOH to ${\beta}$-damascone, trans-2,6,6-trimethyl-1-crotonyl-1-cyclohexene(I).