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제주지역 넙치(Paralichthys olivaceus) 연쇄구균병 원인체의 분리특성과 Streptococcus parauberis의 혈청형 변화
김경욱 ( Kyeong Wook Kim ),유은호 ( Eun Ho Yoo ),양혜영 ( Hye Young Yang ),강봉조 ( Bong Jo Kang ) 한국어병학회 2020 한국어병학회지 Vol.33 No.2
During the period from 2003 to 2020, a total of 470 Streptococcus species were isolated from farmed flounder in Jeju. Out of 470 isolates, 92 (19.6%) isolates and 378 isolates (80.4%) were identified as Streptococcus iniae and S. parauberis, respectively by multiplex PCR assay. During that period, the percentage of S. iniae decreased from 56.9% in 2003 to 0.0% in 2020 whereas that of S. parauberis increased from 43.1% in 2003 to 100% in 2020. In the PCR assay for serotyping, the isolated S. parauberis showed 3 subserotypes, Ⅰa (34.9%), Ⅰb/Ⅰc (46.3%) and II (18.8%). In 2003 and 2004, serotype II was dominant at 59.1% and 50.0% of isolation rates, however between 2005 and 2009, subserotype Ib/Ic was dominant (57.6%, 86.0%, 84.6%, 57.9%, and 83.3%). After 2010, except for 2015, subserotype Ia was the most dominant one. In the last 3 years (2018 to 2020), subserotype Ⅰa was most abundant (70%), followed by subserotype Ⅰb/Ⅰc (16-30%). Serotype Ⅱ was not isolated in 2018, but in 2019 and 2020, it showed an increased tendency to 3.4% and 16.7%, respectively. It is believed that continuous monitoring is necessary for research on countermeasures against streptococcosis of flounder.
DVD 플레이어용 광 셔터에 있어서 ECD 소자의 응용에 관한 연구
박경찬,강춘식,이윤관,유은호,박만효 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.2
The organic type ECD device for optical shutter on DVD player was successfully fabricated & evaluated. This device employ : an evaporated a-WO₃ film as electrochromic layer ; a PVDF-EC-NMP-THF-LiClO₄ as electrolyte layer ; a NiO film as counter electrode ; and ITO layer as transparent electrode between soda-lime glass substrate. This ECD shutter exhibited an useful operating characteristic such as contrast ratio as high as 30 to 1 in the transmission mode with an He-Ne laser(632.8㎚), operating voltage of lower than 2.5V, and response time less than 0.5 sec at room temperature. Cycling test with coloring and bleaching on this device was carried out for more than several hundred times, along with analysis and evaluation of optical properties & microstructure of fabricated layers by means of spectro-photometer, TEM and XRD method, and the accumulation of Li in both a-WO₃nd ITO film after cycling test was investigated by AES & SIMS analysis. From this research, it is found that a number of factors including maintenance of uniformity in both film & electrolyte, prevention of Li ion accumulation in film, optimization of structure design and good sealing condition can contribute to attaining the improvement of properties & life extension in ECD shutter for DVD player.