Wafer final polishing에 따른 표면 현상과 마멸도에 관한 연구

원종구,이정택,황성철,차지완,이은상 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

In recent years, developments in the semiconductor and electronic industries have brought a rapid increase in the use of silicon wafer. For further improvement of the ultra precision surface and flatness of Si wafer necessary to high density ULSI, it is known that final polishing is very important. Polishing one of the important methods in manufacturing of Si wafers and in thinning of completed device wafers. This study will report the evaluation on abrasion of wafer according to variety processing condition, which have major influence on the abrasion and surface defect of Si wafer polishing, were adapted to polishing pressure, machining speed, and the slurry mix ratio. Thus the optimum condition selection of ultra precision Si wafer polishing using load cell and infrared temperature sensor. To evaluate each machining factor, use a data through each sensor. That evaluation of abrasion according to variety condition is selected to use a result data that measure a pressure, machining speed, and the processing time. And optimum condition is selected by this result. By using optimum condition, it achieve a ultra precision mirror like surface.

댄스스포츠를 참여하고 있는 노인들의 개인적 특성에 따른 여가만족도 비교연구

차지원 목포대학교 스포츠 산업연구소 2004 스포츠 산업연구소 논문집 Vol.3 No.-

This study aims to compare and analyse leisure satisfactions of old people who are participating in dance sports according to their personal characteristics. For the purpose, this study targeted 273 male and female old people whose age were above 60 years old, now, participating in dance sports program in welfare centers, continuing education centers of universities, and housewife class in G area. The questionnaire used as a tool for the analysis consisted of a total of 31 questions as follows: 7 questions on personal characteristics and 24 on leisure satisfaction. The confidence coefficient of the questionnaire which was obtained using Cronbach's α value was .74~.88. To analyse the data collected, this study used Frequency Analysis and One way Anova. As a result, the results are presented as follows: First, it was demonstrated that there was a significant difference in psychological leisure satisfaction according to educational background and residential areas. Second, it was demonstrated that there was a significant difference in educational leisure satisfaction according to living-together types. Third, it was demonstrated that there was no statistically significant difference in social leisure satisfaction according to personal characteristics. Fourth, it was demonstrated that there was a significant difference in relaxing leisure satisfaction according to age. Fifth, it was demonstrated that there was a statistically significant difference in physiologic leisure satisfaction according to residential areas. Sixth, it was demonstrated that there was a significant difference in environmental leisure satisfaction according to educational background, residential areas and living-together types.

숙잠 함유 복합물의 알코올 대사 및 숙취개선 효능평가

우미선(Miseon Woo),차지현(Ji Hyeon Cha),김용환(Yonghwan Kim),강희택(Hee-Taik Kang),김현덕(Hyeondok Kim),조경원(Kyong Won Cho),박성선(Sung Sun Park),이종훈(Jong Hun Lee) 한국식품과학회 2021 한국식품과학회지 Vol.53 No.1

숙취를 해결하기 위해서는 숙취를 직접적으로 유발하는 물질인 아세트알데하이드의 조절이 가장 중요한 인자로 작용한다. 숙잠을 함유하는 복합물인 시험식품(CKDHC)의 섭취로 혈중 아세트알데하이드 농도가 대조식품 대비 통계적으로 유의하게 감소하여 숙취개선 효능을 확인하였다. 특히, 30분부터 각 시간별(mg/L), 혈중 아세트알데하이드 농도-시간곡선하 면적(AUC), 최고 혈중 아세트알데하이드 농도(C<SUB>max</SUB>)의 감소를 통해 30분부터 빠른 숙취개선 효능을 확인하였다. 본 연구의 주원료로 사용된 숙잠은 Ji등(2016a)에 따르면 18종의 아미노산 및 무기질을 모두 함유하며, 고단백 식용곤충으로 간에 좋은 주요 아미노산인 Alanine, Arginine 등을 많이 함유하여 간의 효소활성에 긍정적인 영향을 줄 수 있음을 알수있다. 본 연구결과를 통해 숙잠을 함유하는 시험식품이 숙취해소제로 작용할 수 있으며, 특히 음주 전 섭취시 아세트알데하이드를 빠르게 분해하여 30분부터 숙취 개선에 효과가 있음을 입증하였다. Silkworms have traditionally been used to produce silk and textiles. However, steamed and freeze-dried mature silkworm larval powder (SMSP) contain large amounts of amino acids, vitamins, and essential minerals. In this study, we investigated the potential of SMSP as a hangover-relieving agent. Thirty individuals who met the selection criteria and exclusion criteria were included in the study and subsequently underwent a double-blind, randomized, placebo-controlled, cross-design human application test. Importantly, the test product containing SMSP (CKDHC) was proven to alleviate hangovers through a significant reduction in the plasma concentration of acetaldehyde in the context of an alcohol-induced hangover model. In particular, from 0.5 h after SMSP intake, the blood acetaldehyde concentration (mg/L), area under the time curve (AUC; indicating the degree of bioabsorption of blood acetaldehyde), and the highest blood acetaldehyde concentration (Cmax) were reduced. Altogether, these results suggest that the test product (CKDHC) exhibits an accelerated hangover-relieving effect.

대학생의 성별, 학년별, 전공별 스트레스에 관한 연구

김보혜,안윤정,정민영,차지영,최경원,김지현,김수지,이자형 이화여자대학교 간호과학대학 2004 이화간호학회지 Vol.- No.38

The purpose of this study was to investigate the level and effect of stress on physical and mental health. Based on that result, we offer the basic research to lessen students' stress and make a program to promote health condition effectively. Subjects were 526 university students. (male: 232(44.1%) female: 294(55.9%). composed of 7 majors: human studies&social science, management, Science&technology, education. law, medicine, entertainment. freshman 108(20.5%), sophomore 140(26.6%) junior 148(28.1%), senior 130(24.7%)) Subjects were filled with 127 questionnaires. T test and ANOVA were used to evaluate each stress levels. The .05 level of significance was the critical for this research. Also used the correlation to know the relation between stress levels and effects. The result of the study were as follows: 1. According to gender, male students got 2.37, female students got 2.46 on the stress level(p=.05). And also the belonging items showed female students got higher stresses than male students. 2. According to grade, the average score of stress level was 2.42. sophomores got the highest stress and freshmen got the lowest stress level. But that was not meaningful difference. freshman and sophomore got higher stress on studying. and except the freshman, all grades got severe stress on employment. 3. According to major, there were differences on university life and surroundings. On university life, the students who majored management got highest stress and the students who majored Education got the least stress. And on surroundings, the students who majored Law got highest stress. 4. According to gender, female students suffered from more stress effects than male students.(male 2.3725 female 2.4657 t:-1.968 p:.050) 5. According to grade, the average score of stress was 2.2285. sophomore got 2.3042 and junior got 2.2148 on stress effects. 6. According to major, The students who major in law got more stress effects caused by family than any other students. The students who major in entertainment and gymnastics got more stress effects than any other students in surroundings. 7. There were significant correlations between the stress level and effects(r.=847, p=.000).

노인의 영적 간호요구

최미혜,김경희,김귀옥,김기숙,김수강,김정신,김춘숙,노흥진,박지연,성혜연,오명선,이선희,이원옥,이윤영,이현수,장명재,차혜경,채정선,홍상희 중앙대학교 의과대학 간호학과 간호과학연구소 2001 중앙간호논문집 Vol.5 No.1

This study was designed to exam the aged's needs for spiritual nursing care. The purpose was to serve as a basis for the development of spiritual nursing practice. The major findings are as follows : 1. The degree of needs for spiritual nursing care as area was that needs of love and relationship mean 22.0, needs of meaning and object mean 28.2, needs of forgiving mean 13.5. Total needs for spiritual nursing care mean 63.7, which was on the upper middle level. The needs of meaning and object was rated highest. 2. Among the general characteristics of the subjects, needs of love and relatiohship wasn't significanlty different. 3. Among the general characteristics of the subjects, needs of meaning and object was significantly different according to two factors : age(F=7.260, p=0.001), religion(F=5.275, p=0.001). Higher needs of meaning and object was possessed by the older than the younger, by the one who have religion than the other. 4. Among the general characteristics of the subjects, four factors made a significantly difference to needs of forgiving : sex(t=-2.851, p=0.006), age(F=8.201, p=0.001), religion(F=6.928, p=0.000), disease(t=2.327, p=0.024). Higher needs of forgiving was possessed by man than woman, by the older than the younger, by the one who have religion than the other, by the one who have disease than the other.

Adaptive Laboratory Evolution for Improved Sugar Consumption in Klebsiella oxytoca

Ji Won CHA,Seung Hoon JANG,Ki Jun JEONG 한국생물공학회 2019 한국생물공학회 학술대회 Vol.2019 No.4

LAR-RPTP Clustering Is Modulated by Competitive Binding between Synaptic Adhesion Partners and Heparan Sulfate

Won, Seoung Youn,Kim, Cha Yeon,Kim, Doyoun,Ko, Jaewon,Um, Ji Won,Lee, Sung Bae,Buck, Matthias,Kim, Eunjoon,Heo, Won Do,Lee, Jie-Oh,Kim, Ho Min Frontiers Media S.A. 2017 Frontiers in molecular neuroscience Vol.10 No.-

<P>The leukocyte common antigen-related receptor protein tyrosine phosphatases (LAR-RPTPs) are cellular receptors of heparan sulfate (HS) and chondroitin sulfate (CS) proteoglycans that direct axonal growth and neuronal regeneration. LAR-RPTPs are also synaptic adhesion molecules that form <I>trans</I>-synaptic adhesion complexes by binding to various postsynaptic adhesion ligands, such as Slit- and Trk-like family of proteins (Slitrks), IL-1 receptor accessory protein-like 1 (IL1RAPL1), interleukin-1 receptor accessory protein (IL-1RAcP) and neurotrophin receptor tyrosine kinase C (TrkC), to regulate synaptogenesis. Here, we determined the crystal structure of the human LAR-RPTP/IL1RAPL1 complex and found that lateral interactions between neighboring LAR-RPTP/IL1RAPL1 complexes in crystal lattices are critical for the higher-order assembly and synaptogenic activity of these complexes. Moreover, we found that LAR-RPTP binding to the postsynaptic adhesion ligands, Slitrk3, IL1RAPL1 and IL-1RAcP, but not TrkC, induces reciprocal higher-order clustering of <I>trans</I>-synaptic adhesion complexes. Although LAR-RPTP clustering was induced by either HS or postsynaptic adhesion ligands, the dominant binding of HS to the LAR-RPTP was capable of dismantling pre-established LAR-RPTP-mediated <I>trans</I>-synaptic adhesion complexes. These findings collectively suggest that LAR-RPTP clustering for synaptogenesis is modulated by a complex synapse-organizing protein network.</P>

Metabolic Engineering of Klebsiella oxytoca for High Level Production of 2,3-Butanediol

Ji Won CHA,Ki Jun JEONG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.4

Association Between Suicide and Drinking Habits in Adolescents

Ji Won Lee,Bong-Jo Kim,Cheol-Soon Lee,Boseok Cha,So-Jin Lee,Dongyun Lee,Jiyeong Seo,Young-Ji Lee,Youn-Jung Lee,Eunji Lim,Jae-Won Choi 대한소아청소년정신의학회 2021 소아청소년정신의학 Vol.32 No.4

Objectives: Adolescent suicide is a serious social problem. Adolescent alcohol use is one of the most important risk factors for adolescent suicide. This study aimed to identify the relationship between drinking habits and suicide among Korean adolescents. Methods: Data from the 14th and 15th Korean Youth Risk Behavior Web-based Survey, conducted in 2018 and 2019, were used for analysis. Multiple logistic regression analysis was used to identify the relationship between drinking habits—including the age of drinking initiation, frequency of drinking, average drinking amount, frequency of drunkenness—and suicidal ideation, plans, and attempts. Results: Even after adjusting for age, sex, school grade, academic achievement, socioeconomic status, depression, stress, and drinking habits, the frequencies of drinking and drunkenness increased the risk of suicide attempts. Suicide attempts were associated with the frequency of drinking in girls and middle school students, and with the frequency of drunkenness in boys and high school students. Conclusion: This study identified associations between drinking habits (the age of drinking initiation, frequency of drinking, average amount of drinking, frequency of drunkenness) and suicidal behavior in adolescents. Our findings suggest that to prevent adolescent suicide, it might be necessary to investigate drinking habits, including the frequencies of drinking and drunkenness. Moreover, considering the differences in sex and school grade, it is important to include the individual group characteristics when evaluating drinking habits.

Adaptive Laboratory Evolution of Klebsiella oxytoca for Improved Sugar Utilization

Ji Won CHA,Ki Jun JEONG 한국생물공학회 2020 한국생물공학회 학술대회 Vol.2020 No.10