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김원주,박지연,김정일,홍계원,하조웅 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.5
일반 산업 및 원자력 관련 산업용 구조소재의 표면특성 향상을 위해 저압 화학기상 증착법에 의해 15~25cm 직경의 흑연기판 위에 고순도의 치밀한 SiC 증착층을 제조하였다. 미세구조와 두께가 균일한 증착층을 얻기 위하여 증착온도의 균일성, 반응가스 고갈효과, 가스 흐름 형태 등의 영향을 고려하였다. 이중에서 반응 용기내의 가스 흐름 형태가 증착층의 균일도에 가장 큰 영향을 주는 것으로 판단되었으며 가스 주입구의 위치와 크기를 조정함으로써 25cm의 직경을 갖는 흑연 기판에 두께 편차가 $\pm$12% 이내인 SiC 증착막을 제조할 수 있었다.
흰쥐에서 생애초기의 스트레스 경험이 성숙후 신경행동에 미치는 영향
김원주,이서울,김동구,김경환,Kim, Won-Joo,Lee, Seo-Ul,Kim, Dong-Goo,Kim, Kyung-Hwan 대한약리학회 1995 대한약리학잡지 Vol.31 No.2
This study aimed to determine whether exposure to stress during developmental period causes permanent behavioral and/or neurochemical alterations. Alterations of behavior were studied in young and aged rats which have been exposed to uncontrollable and unpredictable electric shocks on postnatal day(PND) 14 or PND 14 and 21. The concentrations of monoaminergic neurotransmitters were also measured to determine whether the behavioral alterations were accompanied by neurochemical changes. The results obtained are as follows: 1) The rate of increase in body weight was reduced at one day after exposure to the 1st series of shocks on PND14. However, these findings could not be observed after exposure to the 2nd series of shocks on PND 21. 2) Explorative activity decreased at one day after exposure to the 1st series of shocks on PND14. However this findings could not be observed after exposure to the 2nd series of shocks on PND 21. 3) At 100 days of age, there were little changes in the spontaneous locomotor activities measured for consecutive 23 hrs. However, there was positive correlation between the shock number showing the 1st helplessness during receiving the 1st series of shocks and the night time ambulatory activity of females, and was negative correlation between the shock number showing the 1st helplessness during receiving the 1st or 2nd series of shocks on PND 14 or 21 and the night time ambulatory activity of females. 4) At $360{\sim}390$ days of age, night time ambulatory activity decreased in female rats which have been exposed to shocks on PND 14 and 21, but not in males. 5) In the aged female rats, the concentrations of 5-HT, dopamine and their metabolites were not different among groups. However, the ratio of 5-HIAA/5-HT increased in the frontal cortices of rats exposed to shocks on PND 14 and 21. These results demonstrate that the early experience of serious stress results in persistent alterations of behavior accompanying altered neurochemistry, and aging may unmask a subtle neuronal deficit causes by the early experience of serious stress.
김원주,한영숙 한국조리과학회 2004 한국식품조리과학회지 Vol.20 No.5
In this study, the author examined the fermentative abilities and baking properties of commercial baker's yeasts and suggested the fundamental data for the development of the yeast products industry. Carbon dioxide production, expansion abilities of doughs, and maltose fermentative abilities were measured with commercial yeasts. The fermentative abilities of various bread doughs were determined in comparison to a reference yeast and a selected yeast from commercial yeast. Various breads were prepared by these two yeasts and their sensory properties were evaluated. Y7, followed by Y5 and Y4, shooed higher ability than any other commercial yeasts in the gassing power of the dough, as measured by a Meissle fermenter. In the expansion abilities of the doughs made from various yeasts by M-Cylinder, Y7, followed by Y4 and Y5, showed the best expansion ability the results were similar to those for gassing power. Therefore, Y7 was selected. The maltose fermentative abilities of various yeasts in Atkin's liquid medium showed a higher value in Y5, Y7 and Y4. Selected yeast Y7 and the reference yeast K were used for determining the fermentative abilities of various bread doughs. For the various breads prepared by K and Y7, the qualities of the breads such as volume, weight and specific volume were measured. The volume by Y7 was higher in the straight dough bread, and that by K was higher in the sponge dough bread. In the sweet dough bread, both Y7 and K were excellent groups for it. Sensory properties of various breads made from K scored high on the items such as external properties and color in the straight dough bread. It also acquired a good score on the item of the crusts in the sweet dough bread. The overall acceptability of Y7 and K were similar.
김원주 대한수면연구학회 2013 Journal of sleep medicine Vol.10 No.1
Background : For evaluating the work load for medical residents, it is important to search the work hour and sleep status. The purpose of this study was to find out the sleep status of residents in neurology department in Korea. Methods : We recruited neurological residents of 12 University hospitals. They completed questionnaires including their sleep and work hours, sleep habit, Stanford Sleepiness Scale (SSS), Epworth Sleepiness Scale (ESS), health problem and so on. Results : We excluded the residents who were diagnosed sleep disorder in history. One hundred three residents (male: 67, female 36) were analyzed. Average sleep duration on off duty days was 5.8 ± 0.9 hours, on duty days was 4.6 ± 1.3 hours and mean work hours was 14.6 ± 2.3 hours. Average SSS score was 2.6 ± 1.0 and ESS was 10.6 ± 5.1. Group analyzed by resident grade showed short sleep duration in first and second grade on duty days. ESS score was higher in first and second grade than other grades. Conclusions : Most neurological residents were suffered from sleep deprivation especially first and second grade on duty days. They also feel sleepiness drowsiness during a daytime.