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한국 자생차엽의 유리아미노산, 유기산, 지방산 함량에 관한 연구
朴 章炫(Jang-Hyun Park),金 廣植(Kwang-Sik Kim),崔 炯局(Hyoung-Koog Choi) 한국차학회 1997 한국차학회지 Vol.3 No.2
The contents of free amino acid, organic acid and fatty acid were analyzed and compared in tea shoot of natively grown tea plants (camellia sinensis var. sinensis) in Korea, the tea plants were collected from 29 locations. The resnlts are summaried as followed. Theanine and 13 other kinds of free amino acids were isolated from native tea leaves. The total contents of free amino acids are in range of 1833-2408 mg/100g. Theanine, aspartic acid, serine, glutamic acid and arginine, the taste-determinants of green tea liquor, occupied as much as 84.5~91.5% of total amino acid. Among these, theanine occupied over 50%. The contents of malefic, malic, succinic, propionic, and oxalic acid are in range of 1630~3289. 939~2503, 321~903, 2058~ 3903 and 4029~7822 mg/kg, respectively. The total contents of organic acids are in range of 11109~16422 mg/kg. The total contents of fatty acids are in range of 2129~2938 mg/100g. The composition ratios of fatty acids of native tea leaves ranged C16:0 17.8~22.4%, C18:0 0.6~2.3%, C18:1 4.7~9.0%, C18:2 21.2~25.3% and C18:3 42.6~49.0%. All together, these results suggest that the native tea plants naturally grown at Bosong Daewonsa, Hwasun Ssangbongsa, Shunchon Changchon-ri, Hadong Ssanggyesa, Namhae Borian, and Kangjin Jangwon tea field are the species of excellency, in terms of abundance of free amino acids including theanine and fatty acids, and less contents of organic acids.
클라우드 기반의 가상실험 학습콘텐츠의 서비스 동향 분석 및 시범개발
정광식, 권수열, 김연신, 이남형, 이충헌, 정상임, 이응석 한국방송통신대학교 2019 정책과제 Vol.2019 No.-
○ 개인 이동 단말기로 가장 큰 비율을 차지하고 있는 스마트폰은 60대를 제외한 모든 연령대에서 90% 이상이 사용하고 있다. 2009년 처음 아이폰(iPhone)이 국 내에 소개된 이후로 스마트폰에 대한 관심이 급격히 높아지고 있음 ○ 또한, 한국방송통신대학교의 학습콘텐츠에 대한 스마트폰의 이용자수도 급격히 증가하고 있으며, 대외적으로도 소프트웨어나 콘텐츠가 기존의 웹 콘텐츠를 넘어 서고 있음 ○ 인쇄도서를 선호하던 전문 직종 종사자들도 디지털 책 형태의 전문서적을 선호 했으며 교육용 도서 역시 휴대 간편성과 가격의 저렴함을 무기로 이용층이 크게 증가함(PwC, 2016) ○ 디지털 책의 성장세는 지속적이고 급격하게 계속될 것으로 예측되고 있으먀, 이 에 따라 한국방송통신대학교는 디지털교재 기반의 학습콘텐츠를 개발해야할 필 요성이 높아지고 있음 ○ 한국방송통신대학교의 미래 학습콘텐츠에 대한 시스템 모델과 서비스 모델, 그 리고 이에 대한 학습모델에 대한 연구가 필요하며, 현재까지 한국방송통신대학 교에서 소흘하게 다루었던 자연과학 분야의 가상 실험 과목에 대한 학습 몰입도 를 높여 학습 집중도를 향상시키고, 모바일 기기의 활용도를 높일 수 있는 상호 작용 요소를 갖춘 가상 실험 디지털 교재의 개발이 필요함
기능적 눈물길 폐쇄에서 눈물길 신티그라피와 플루오레세인 염색소실검사의 유용성 비교
주광식,이정규.Kwang Sic Joo. MD. Jeong Kyu Lee. MD. PhD 대한안과학회 2011 대한안과학회지 Vol.52 No.9
Purpose: To compare the usefulness of fluorescein dye disappearance test (FDDT) and dacryoscintigraphy in functional lacrimal blockage. Methods: The present study included with 24 patients (37 eyes), who were diagnosed with functional lacrimal blockage and underwent silicone tube insertion in our clinic. Compared to postoperative symptom improvement, the results of FDDT and dacryoscintigraphy were analyzed. Results: Significant correlations were observed with FDDT and dacryoscintigraphy results in 29 eyes before surgery. In 33 eyes, there were post-operative symptom improvements and the sensitivity of each exam was estimated at 87.8% in FDDT and 90.9% in dacryoscintigraphy. After intubation normal findings were observed in each examination and the symptoms improved in 7 out of 8 eyes. Conclusions: Both FDDT and dacryoscintigraphy were considered sensitive and efficient methods in the diagnosis and evaluation of functional lacrimal blockage. Both methods require caution regarding misinterpretation by false negatives and may be complementary as well as increasing diagnostic accuracy. J Korean Ophthalmol Soc 2011;52(9):1013-1018
Unsupported molybdenum sulfide catalysts for upgrading vacuum residue
정광식,허영걸,이관영,김찬훈 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Recent world oil demand gradually increase compare to supply of light oil. Since Oil shock hit the world wide, necessity of self-sufficiency in oil brings interest of non-conventional upgrading technology in petroleum industry. Even many catalysts developed nowadays, heavy oil upgrading technologies are facing lots of problems. Typical problems are mass transfer limitation, catalyst deactivation, and loosing valid carbon by coke form. Those problems are occurred by one main reason that heavy fraction in oil dramatically increased. Asphalthene and resin are large enough to block entrance of commercial supported catalysts and that bring mass transfer limitation and deactivation. To avoid issue of texture properties of support and sustain advantages of using support,colloidal dispersed catalysts are suitable. In this study, using general petroleum catalysts sources, molybdenum and cobalt molybdenum were used as dispersed colloidal catalysts.