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Recovery of Arbutin in High Purity from Fruit Peels of Pear (Pyrus pyrifolia Nakai)
조정용,박근영,이기훈,이형재,이상현,조정안,김월수,신수철,박근형,문제학 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.3
β-Arbutin is one of the most abundant compounds in pear fruit and has been widely used as a whitening agent in cosmetic products. In this study, a simple method for the purification and isolation of arbutin in high purity from the fruit peel of a pear (Pyrus pyrifolia Nakai cv. Chuhwangbae) was developed. The high extraction efficiency of arbutin was accomplished with 80% ethanol under acidic conditions (pH 3.0). In the partition between water and ethyl acetate, almost all of the arbutin (78%) was detected in the water layer. Therefore, arbutin was further purified and isolated from the water layer using Diaion HP-20 column chromatography and preparative HPLC. The isolated arbutin represented a 60% recovery with a purity exceeding 99%.
실시간 운영체제 하에서의 임베디드 시스템을 위한 효율적인 FAT 모델 구현
조정철(Jung-Chul Jo),이호송(Ho-Song Lee),성영락(Yeong Rak Seong),권택근(Taeck-Geun Kwon),이철훈(Cheol-Hoon Lee) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A
최근 실시간 운영체제하에서의 특정한 기능을 수행하는 임베디드 시스템의 급속한 발전함에 따라 유, 무선 네트워크 기능뿐만 아니라 PDA(Personal Digital Assistants), 디지털 TV 등에 사용되는 멀티미디어 처리가 가능한 시스템이 필요하게 되었다. 이런 시스템은 효율적인 파일시스템을 필요로 하게 된다. 본 논문에서는 많은 운영체제에서 사용되는 FAT(File Allocation Table) 파일 시스템을 실시간 운영체제와 함께 동작하도록 구현하는 방법을 제시한다.
공공기관 에너지 효율등급 향상을 위한 적용 설계요소에 관한 연구
조정철(Cho, Jung-chul),박재승(Park, Jae-seung) 한국실내디자인학회 2012 한국실내디자인학회논문집 Vol.21 No.4
There are lots of buildings which were built before the Legislation on building energy rating system. Remodeling of the buildings would be required for an improvement of the building energy rating system was enforced by the government. In the Passive Building Design, Elements which will be used for the remodeling are Insulation, Window, External venetian blind, Heat exchanger. The Purpose of this study is to indicate a Method for the improvement of Energy saving by an analysis of Construction Cost, Cost Evaluation, Energy performance Efficiency in applied design elements. In this study, the remodeling of existing public buildings to improve energy efficiency rating was applied to extract the elements of design-specific energy performance, efficiency, and the application of the designs that has been analyzed. The results were as follows: applying the design-specific cost-effective investment that represents the economy (investment efficiency/%) surveyed the average insulation(7.0%), triple glazed windows(10.1%), double glazed windows(12.1%), external shading(24.5%), and Heat(77.2%) were analyzed in order to be more efficient. Analysis of the basis of information on the existing public buildings to improve energy efficiency rating for the remodeling depending on driving conditions at a degree of individual difference. The main effect, however, depending on economic investment, design elements, heat exchangers, external awning, double glazed windows, triple glazed windows, insulation, is recommended as review of the order shall be determined.
조정철(Jeong Cheol Cho),신옥철(Ok Cherl Shin),김진호(Jin Ho Kim),홍선희(Sun Hee Hong),강창성(Chang Seong Kang),안기범(Ki Bum An),왕영미(Young Mee Wang),박종규(Jong Kyou Park) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.9
Despite the rarity of 48, XXYY, having an incidence rate of 1 in 50,000 persons, 1 in 300 persons are reported to have a mental disorder of criminal behavior. The clinical characterics of 48, XXYY are similar to Klinefelter's syndrome such as small testis, tall stature, gynecomastia and can show mental retardation and skeletal anomaly. When the cause of elevated maternal serum AFP is not explained by USG or measurement of amniotic fluid AFP, during the second trimester of pregnancy, it is defined as unexplained elevation of maternal serum AFP. We report a case of 48, XXYY with unexplained elevation of maternal serum AFP which has been experienced in our hospital with brief review of literature.