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류지열,박성현,최혁환,권태하 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
The ZnO(zinc oxide) thin film sensors were manufactured by RF magnetron sputtering method and added up to 4 wt. % Al_(2)O_(3), 1 wt. % TiO_(2) and 0.2 wt. % V_(2)O_(5) on the basis of ZnO material for developing the high sensitive gas sensors which have practically moderate resistivity and the stability. They were also grown on heated SiO_(2)/Si substrates of 250 ℃ at a pressure of about 10 mTorr in the pure oxygon gas with a power of about 80 watts for 10 minutes. To manufacture the thin film of the more stable high sensitivity, the thin films were also annealed from 400 ℃ to 800 ℃ and the thin films which were annealed with 700℃ for 60 minutes in the pure oxygon gas exhibited a good properties. The thin film grown in this conditions exhibited the sensitivity of maximum 550 in TMA gas concentration 160 pμm and exhibited a good stability and excellent linearity.
Low-threshold Photonic Crystal Lasers from InGaAsP Free-standing Slab Structures
Ryu, Han-Youl,Kim, Se-Heom,Kwon, Soon-Hong,Park, Hong-Gyu,Lee, Yong-Hee Optical Society of Korea 2002 Current Optics and Photonics Vol.6 No.3
Photonic band gap structures have a high potential for nearly zero-threshold lasers. This paper describes new-types of low-threshold photonic crystal lasers fabricated in InGaAsP slab waveguides free-standing in air. Two-types of photonic crystal lasers are studied. One is a single-cell nano-cavity laser formed in a square array of air holes. This photonic band gap laser operates in the smallest possible whispering gallery mode with a theoretical Q >30000 and exhibits low threshold pump power of 0.8 mW at room temperature. The nther laser does not have any cavity structure and the lasing operation originates from the enhanced optical density of states near photonic band edges. A very low threshold of 35 $\mu$W (incident pump power) is achieved from this laser at 80 K, one of the lowest values ever reported. This low threshold is benefited from low optical losses as well as enhanced material gain at low temperature.
Kwon, Hyun-Jung,Kim, Tae-Myoung,Ryu, Jae-Myun,Son, Seung-Hwan,Hong, Jin-Tae,Jeong, Heon-Sang,Kang, Jin-Seok,Ahn, Ji-Yun,Kim, Sung-Ran,Ha, Tae-Youl,Kim, Dae-Joong The Korean Society of Food Science and Nutrition 2008 Preventive Nutrition and Food Science Vol.13 No.3
Cancer-preventive effects of ethanol extract of elm tree root (EEE) were investigated. In the in vitro cytotoxicity assay, colon cancer cells were incubated with a chloroform fraction of EEE (CF-EEE). CF-EEE significantly inhibited the proliferation of cells and induced apoptotic cell death in a dose-dependent manner. For the assessment of chemopreventive efficacy in vivo, male F344 rats were fed with EEE (0.5 or 1%) in diet for 8 weeks, and were subcutaneously injected with 1,2-dimethylhydrazine (DMH) to induce colonic aberrant crypt foci (ACF). EEE (0.5 and 1%) significantly decreased both the numbers of AC (1191.1/colon) and ACF (529.3/colon) induced by DMH. In addition, in the Western blot analysis on the colonic mucosa, administration of EEE triggered expression of caspase-3, a key factor of an apoptotic cascade. These results suggest that extract of elm tree root may have potential chemopreventive principles that lead to apoptosis of cancer cells, and thereby suppress colorectal carcinogenesis during the initiation stage.
임프란트에 부착하는 세균의 동정 및 효과적인 항생제 선택
김선권,유선열 전남대학교 치과대학 1996 전남치대논문집 Vol.8 No.1
This study was done to examine adherence of oral bacteria to titanium dental implant and to know the effective prophylactic antibiotics using an in vivo model. Three samples each of the implant material were set in an acrylic resin flange and placed in the maxillary buccal sulcus of twenty volunteers. At 6-and 54-hour intervals, each sample was placed on blood agar plate(BAP) and chocolate agar, and then they were incubated and identified. Also antibiotic susceptibility test was performed. The results obtained were as follows : 1. The microorganisms were chain-like Gram positive cocci and staphyline Gram positive cocci, Gram positive bacilli in order of frequency were found at 6-hour and 54-hour samples by Gram staining. 2. Streptococci was found predominantly at both 6-hour and 54-hour samples, but number of streptococci was decreased as compared to 6-hour samples. 3. There was no difference in the bacterial species adherent to implant between 6-hour and 54-hour samples. 4. All the microbes were sensitive to AMC(amoxacillin clavulanic acid), chloramphenicol, quinolone and vancomycin in the antibiotic susceptibility test. Above results suggest that streptococcus are mainly adhered to titanium implant after implant was placed in the oral cavity and AMC is the most recommendable antibioties to prevent the peri-implant inflammation.