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구자민(Jamin Koo),이명원(Myeongwon Lee),강정민(Jeongmin Kang),윤창준(Changjoon Yoon),김광은(Kwangeun Kim),김상식(Sangsig Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
n형 특성을 가진 실리콘 나노선을 금확산을 이용하여 p형 특성을 가진 상태의 나노선으로 변환하였다. Back-gate 형태로 제작된 n형의 실리콘 나노선 전계 효과 트랜지스터를 제작한 후, 채널로 사용되는 나노선 위에 금을 열증착방법을 이용하여 증착했다. 이후, 급속열처리공정을 통해 실리콘 나노선에 금이온을 확산시켰다. 나노선의 특성 변환을 확인하기 위하여 전계 효과 트랜지스터의 특성곡선을 통해 그 변화를 관찰하였다.
Charge Transport Modulation of Silicon Nanowires by O₂ Plasma
구자민(Jamin Koo),이명원(Myeongwon Lee),김상식(Sangsig Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
The modification of the electrical characteristics of field-effect transistors (FETs) with channels composed of p-type silicon nanowires (SiNWs) by oxygen plasma treatment is investigated in this study. After the back-gate SiNWFETs were subjected to oxygen plasma treatment, the magnitude of the drain current of the p-type SiNWs was increased and the gate-dependent characteristics of them were also improved. The changes in the electrical characteristics are due to the adsorption of oxygen ions on the surface of the SiNWs. To verify the effect of the oxygen ions, the SiNWFETs were kept in a vacuum for 24 hours whereupon their electrical characteristics tended to revert to their inherent state.
구자민,류지성,정규혁,이철우,박응로,박광식 한국환경독성학회 2001 환경독성보건학회지 Vol.16 No.4
Endocrine disruption in crucian carp (Carassius auratus) living in the branch of Han River were examined. Vitellogenin level in plasma was measured using ELISA system and aromatase mRNA level in brain was observed using RT-PCR technique. In all female fish, vitellogenin levels were in the range of 20-40㎍/ml and aromatase mRNA expression could be detected on the agarose gel after RT-PCR. However, in case of males, vitellogenin level was elevated in only one fish, while vitellogenin was hardly detected in others. Aromatase was expressed in all males although the levels were relatively lower than the level in female fish. Testis-ova and any other histological changes of reproductive organ were not shown in both sexes.
인간 폐포세포 유래 A549세포주에서의 Cadmium 처리에 의한 메탈로치오닌 유전자 발현
박광식,구자민 한국환경독성학회 2003 환경독성보건학회지 Vol.18 No.1
Metallothionein gene expression activity of cadmium was investigated in a human lung epithelial cell line. Cells, grown to near confluence, were exposed to 0~10 μM Cd metal for 6 hours. Cadmium did not cause morphological alteration in lung epithelial cells that are characteristic of cell damages such as cell shrinkage, detachment of the cell from its neighbors, cytoplasmic and chromatic condensation. However, metallothionein genes of MT-I and MT-2 were rapidly induced in the treated cell measured by RT-PCR. Regarding the induction pattern of metallothionein mRNA, MT- I mRNA was induced in a dependent manner. MT~2 mRNA induction, which was measured using oligo primers based on cDNA of human reticulocytes, seemed to be slightly increased in low doses but decreased at high concentration used in the experiment.