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Memory 소자 응용을 위한 BST(Ba_xSr_1-_xTiO_3) 강유전체 박막과 전극과의 계면특성
정민재,조정희,홍석민,김호건,김옥경 漢陽大學校 工學技術硏究所 1997 工學技術論文集 Vol.6 No.1
BaxSr1-xTiO3 powders were prepared by changing stoichiometry of Ba and Sr. After they were calcined and sintered at 1,200℃ and 1,300℃ respectively, BST sputtering targets were made in 3inch mould. For MIM structure capacitors. Pt-based structures such as Pt/TiN/SiO2/Si, Pt/Ti/Si3N4/Si, Pt/SiO2/Si, Ru/SiO2/Si and Ru/Si3N4/Si were used for bottom electrodes, and subsequently, the BaxSrl-xTiO3 thin films were sputtered on them. After the analysis of their structures by XRD, Al was evaporated on the BST films for MIM capacitor. We found that the structures of the films showed good crystallinity above 550℃ from the results of XRD measurements. The largest dielectric constant of films was obtained with 0.7mol% of Ba. The electric properties of the capacitors were very good with Pt/TiN/SiO2/Si electrodes.
Synthesis of Benzo[c]phenanthridine Derivatives and their in Vitro Antitumor Activities
Cho, Won-Jea,Yoo, Su-Jeong,Chung, Byung-Ho,Choi, Bo-Gil,Cheon, Seung-Hoon,Whang, Soon-Ho,Kim, Sin-Kyu,Kang, Boo-Hyon,Lee, Chong-Ock The Pharmaceutical Society of Korea 1996 Archives of Pharmacal Research Vol.19 No.4
Aiming at the development of anticancer agents by modification of phenolic benzo[c]phenanthridine alkaloid, additional hydroxyl group was put on C10 position of fagaridine (1) by a biomimetic synthetic procedure to afford 10-hydroxyfagaridine (12). All of the synthetic intermediates were also screened in vitro antitumor activities against five different cell lines as well as 12. Among them the representative cytotoxic results are shown as follows; P-quinone (11) $[ED_50;(A549=0.22; {\mu}g/ml)$, $(HCT;15=0.21 {\mu}g/ml)$, fagaridine (1) $(HCT;15=0.41 {\mu}g/ml)$, olefin (6) $(HCT; 15=0.06 {\mu}g/ml)$, acetal (7) $(SKMEL-2=0.07 {\mu}g/ml)$, dihydrofagaridne (10) $(A549=0.38 {\mu}g/ml)$, 10-hydroxyfagaridine (12) $(A 549=0.45{\mu}g/mi)$. From these observation three main remarks can be drawn; (i) the iminium part of benzo[c]phenanthridine is not essential for showing acitvities, (ii) the additional hydroxyl group did not contribute to enhance the cytotoxicity, (iii) the 3-arylisoquinolin-1(2H)-one derivatives were found to display significant in vitro antitumor activity.
작업자 안전을 위한 영상센서 활용 인원 계수 시스템 개발
한재호(Jea-Ho Han),조윤호(Yun-Ho Cho),장철호(Cheol-Ho Jang),이주식(Ju-Sik Lee),이병철(Byeong-Cheol Lee),정종열(Jong-Yeol Jeong) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.11
인원 계수 시스템은 산업 현장 등 복잡한 구조 내에서 다양한 형태의 작업자(짐을 지고 있는 경우, 양 방향에서 오가는 경우 등)의 출입 및 재실인원 정보를 파악하기 위해 만든 안전장치이다. 본 논문에서는 이 시스템의 정확한 작동을 위해 CMOS 이미지 센서를 활용한 영상데이터 라벨링 기법, YOLO를 통한 영상AI학습 방법(Making Box), People Counting 알고리즘을 소개한다.
Changes in Brain Activity of Rats due to Exposure to Fine Dust Using ¹⁸F-FDG PET
조윤호(Yun-Ho Cho),조규상(Kyu-Sang Cho),이왕희(Wang-Hui Lee),최재호(Jea-Ho Choi) 대한방사선과학회(구 대한방사선기술학회) 2022 방사선기술과학 Vol.45 No.3
Fine dust threatens human health in various forms, depending on the particle size, such as by causing respiratory, cardiovascular, and brain diseases, after entering the body via the lungs. The aim of this study was to correlate fine dust exposure with changes in brain blood flow in Sprague Dawley rats by using micro-positron emission tomography and elucidate the possibility of developing cerebrovascular diseases caused by fine dust. The subjects were exposured to an average fine dust (particulate matter 2.5) of 206.2 ± 7.74 to ten rats four times a day, twice a day for 90 min. Before the experiment, they were maintained at NPO to the maximize the intake of 18F-fluorodeoxy glucose(18F-FDG) and minimize changes in the 18F-FDG biomass depending on the ambient environment and body temperature of the rats. PET images were acquired in the list mode 40 min after injecting 18F-FDG 44.4 MBq into the rats tail vein using a micro-PET scanner pre and post exposure to fine dust. We found that the whole brain level of 18F-FDG standardized uptake value in rats averaged 5.21 ± 0.52 g/mL pre and 4.22 ± 0.48 g/mL post exposure to fine dust, resulting in a statistically significant difference. Fine dust was able to alter brain activity after entering the body via the lungs in various forms depending on the particle size.
SYNTHESIS AND BIOLOGICAL EVALUATION OF 3-ARYLISOQUINOLINES AS ANTITUMOR AGENTS
Cho, Won Jea,Park, Myun Ji,Chung, Byung Ho,Lee, Chong Ok 전남대학교 약품개발연구소 1998 약품개발연구지 Vol.7 No.1
To investigate the structure-activity relationship of 7,8-dimethoxy-2-methyl-3-(4,5-methylenedioxy-2-vinylphenyl)isoquinolin-1(2H)-one 2, diverse substituted 3-arylisoquinolines were synthesized and tested in vitro antitumor activity against five human tumor cell lines. The results showed a broad antitumor spectrum for a series of 3-arylisoquinolines.
Cho, Jong-Young,Cui, Hao,Park, Jin-Hyung,Yi, Sok-Ho,Park, Jea-Gun The Electrochemical Society 2010 Electrochemical and solid-state letters Vol.13 No.5
<P>In chemical mechanical polishing (CMP), the polishing rate of Ge2Sb2Te5 (GST) films increases sharply with H2O2 concentration up to 0.2 wt % and then increases slightly with a further increase in H2O2 concentration up to 3.0 wt %. However, the polishing rate of SiO2 films increases very slightly with H2O2 concentration up to 3 wt %. Polishing selectivity of GST films to SiO2 films of over 100:1 can therefore be achieved by adding H2O2 to the slurry. To understand the mechanism of GST CMP with H2O2, we investigated the chemical reaction behavior on the GST film surface using potentiodynamic measurement and X-ray photoelectron spectroscopy.</P>
Cho, Won Jea,Kim, Eui Ki,Park, Myun Ji,Choi, Sang Un,Lee, Chong Ock,Cheon, Seung Hoon,Choi, Bo Gil,Chung, Byung Ho 전남대학교 약품개발연구소 1998 약품개발연구지 Vol.7 No.1
In this study a series of 3-arylisoquinoline derivatives were synthesized and cytotoxicity against human melanoma tumor cell evaluated, and a three dimensional quantitative structure-activity relationship was investigated using the comparative molecular field analysis (CoMFA). The results suggested that the electrostatic, steric and hydrophobic factors of 3-arylisoquinolines were strongly correlated with the antitumor activity. Considerable predictive ability (cross-validated r² as high as 0.721) was obtained through CoMFA.
Synthesis and Antitumor Activity of 3-Arylisoquinoline Derivatives
Cho, Won Jea,Yoo, Su Jeong,Park, Myun Ji,Chung, Byung Ho,Lee, Chong Ock 전남대학교 약품개발연구소 1997 약품개발연구지 Vol.6 No.1
In order to study the structure-activity relationship of 7,8-dimethoxy-2-methyl-3-(4,5-methylenedioxy-2-vinylphenyl)isoquinoline-1(2H)-one (2), which has exhibited significant antitumor activity, chemical modifications of 2 were performed to yield the corresponding products (3-7). Further systematic uses of an efficient procedure for the synthesis of 3-arylisoquinoline derivatives produced the substituted compounds (9a-9g), which were tested for in vitro antitumor activity against five different human cancer cell lines.