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MEE법으로 성장한 InAs/GaAs 양자점의 발광특성
오재원,변혜령,류미이,송진동,Oh, Jae Won,Byun, Hye Ryoung,Ryu, Mee-Yi,Song, Jin Dong 한국진공학회 2013 Applied Science and Convergence Technology Vol.22 No.2
Migration-enhanced epitaxy 성장한 InAs/GaAs 양자점(quantum dots)의 광학적 특성을 PL (photoluminescence)과 Time-resolved PL 이용하여 분석하였다. InAs 양자점은 In을 9.3초 공급하고 5초 차단한 후 As을 3초, 4초, 6초, 또는 9초 공급하고 5초 차단하는 과정을 3회 반복하여 성장하였다. As을 3초 공급한 시료의 PL 피크는 1,140 nm에서 나타나고, PL 세기는 다른 세 시료에 비해 매우 약하게 나타났다. As 공급시간을 3초에서 증가하였을 때 모든 PL 피크는 1,118 nm로 청색이동하여 나타났으며, PL 세기는 증가하였다. As을 6초 공급한 시료의 PL 세기가 가장 강하게 나타나고, 반치폭(full width at half maximum)도 가장 좁게 나타났다. 이러한 결과는 양자점의 밀도와 균일도(크기변화)로 설명된다. 또한 발광파장에 따른 PL 소멸시간은 PL 피크 근처에서 가장 길게 나타났다. The luminescence properties of InAs/GaAs quantum dots (QDs) grown by a migration enhanced epitaxy method have been investigated by using photoluminescence (PL) and time-resolved PL measurements. The MEE method supplies materials in a series of alternate depositions with migration enhancing time between each deposition. After In source was supplied for 9.3 s, the growth was interrupted for 5 s. Subsequently, As source was open for 3 (AT3), 4(AT4), 6 (AT6), or 9 s (AT9), and the growth was interrupted for 5 s again. This growth sequence was repeated 3 times for the growth of InAs QDs. The PL peak of the AT3 was 1,140 nm and the PL intensity was very weak compared with that of the other three samples. The PL peak of all samples except the AT3 sample was 1,118 nm, which is blueshifted from 1,140 nm, and the PL intensity was increased compared to that of the AT3. These results can be explained by the increased QD density and the improved QD uniformity. The AT6 sample showed the strongest PL intensity and the narrowest full width at half maximum. The PL decay time of AT6 increased with increasing emission wavelength from 940 to 1,126 nm, reaching a maximum decay time of 1.09 ns at 1,126 nm, and then decreased as the emission wavelength was increased further.
노인의 건강증진행위와 건강문제 및 대처양상에 대한 연구
고미혜 中央醫學社 1990 中央醫學 Vol.55 No.12
The purpose of this Study is to provide with basic data for elderly health promotion and maintain in order to plan concerning to the health promoting life style, health needs and coping bahaviors. The data was collected from Oct. 20 till Nov. 4 1990 by individual interviews from the 100 subjects over 65 years of age. The results of the study were as follows: 1. The average number of health promoting style was 5.2. 2. The average number of complaints of health problem was 1.4. 3. The proportions of health problem complaints were neurological and sensorial system 43 %, musculoskeletal and connestive tissue 32 %. 4. Female has more health problem style. (T:-2. 12, P <.05) 5. No coping' was indicated by 44 % of the subjects. The reasons for `no coping' were `by reason of old age' 44 %, `by reason of economical problem' 32.6 %. 6. The health promoting behaviors have significant t-value at circulatory. (T: 1.84, P<.05)
윤혜미 충북대학교 교육·생활연구소 생활과학연구센터 2000 생활과학연구논총 Vol.3 No.-
The use of alcohol has become an established part of the college experience. While campus alcohol abuse is often thought of as time limited behavior, it can be indicative of long term problems. The purpose of this study was to examine alcohol use and misuse patterns among university students expecting to find out some useful issues in the development of campus alcohol abuse prevention program. Specifics were to investigate some of the differences in factors that influences drinking behavior, that is, alcohol-related knowledge, motivations, attitudes, alcohol related consequences according to demographic variables: to examine whether students' peer-group alcohol related norms. Social survey method was employed. The subjects consisted of 1,125 Chungbuk National University students drawn from the campus residential facilities and class enrollment. Self-report questionnaire was administered, data were analyzed by frequencies and percentiles, t-test, F-test and LSD using SAS. The results indicated that 88.4% were drinker characterized with casual alcohol use and some in rather frequent binge drinking. Gender and age were the significant demographic variables which showed differences in alcohol knowledge and alcohol consequences. Use patterns(the amount of alcohol use and binge drinking experience) were found be to related to alcohol motivation, attitudes and consequences. Finally, peer drinking norms were indeed associated with students' alcohol use patterns. College students tend to overestimate the drinking norms, expectations, and actual drinking behavior of their peers, even of their closest friends. Implications for development of college alcohol policy were presented.
박혜숙,박성미 부산대학교 영유아보육연구소 1996 영유아보육연구 Vol.2 No.-
The purposes of this study are to survey the food service management practices and to survey food preferences of children in child care centers in order to provide basic information and guideline for development of food service. The survey was performed at 37 child care centers and 70 classes of child care centers. The results of the survey as followings: first of all, the food service management practices such as : facilities for food service were poor; development of recipe as well as purchase of food were not done by an expert; the hygienic condition of kitchens especilly the sanitary practices of employees needed more attention for improvement; the hygienic condition of dinning room showed potential problem; education for a desirable dietary life was not systematical. Followings are the survey results of food preferences of children in child care centers: Both infants and children prefer soft or mild taste to hot, salty, or pungent taste. Also they prefer Meats, eggs, potatos and seaweeds to several vegetables; leaves of red pepper, shepher's purse, water dropwort, braken etc.
청소년의 인터넷 활용이 자아정체감에 미치는 영향에 관한 연구
박미석,조혜진 숙명여자대학교 출판부 2002 生活科學硏究誌 Vol.17 No.-
The purpose of the present research was to provide basic materials for groping for the methods that promote adolescents' self-identity through the utilization of the internet. After scrutinizing the actual conditions of adolescents' use of the internet, this study examined the effect of adolescents' family environment, friendships, and use of the internet on their self-identity. Specifically, the present research sought to explore the utilization of the internet by sociodemographic and family environment variables, the effect of background variables on the psychological variable, as well as the relative effects of background variables and the internet-related variables on the psychological variable. The major findings of the study were as follows: The effect of the various variables on adolescents' self-identity showed that the higher the levels of school record, communication with fathers, communication with mothers, intimacy of friendships, and the use of the internet, and the lower the degree of the internet addiction, the higher the level of self-identity. The findings of this research indicate that the level of internet utilization and its addiction among family environment-related variables exerted significant influence on self-identity. This implies that the proper use and guidance of the internet is crucial to adolescents' self- identity, and the use of the internet needs to be guided by families, schools, and communities.
오미혜 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
We report a case of left salpingeal serosa tumor with features of Wolffian adnexal tumor. A 36-year-old woman underwent Caesarean section for full term delivery. During operation, a 1cm-sized round mass is found on serosa of left salpinx incidentally. On microscopic examination, the tumor showed mixed pattern of tightly packed tubular structures and difffuse spindle cell proliferation. Immunohistochemical study demonstrated positivity for cytokeratin, vimentin and calretinin, and negativity for inhibin, epithelial membrane antigen, estrogen receptor, progesterone receptor, cytokeratin 20 and inhibin.