• 멤브레인
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• 제15권4호
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• pp.255-271
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• 2005

고분자/층상실리케이트 나노복합체(polymer/layeres silicate nanocomposite, PLSNs) 필름은 보통 내부층을 나트륨과 같은 양이온을 이용한 이온교환을 통해 유기화된 clay로 만든 재료의 새로운 형태이다. 이것은 중합법, 용액법, 그리고 용융법과 같은 다양한 방법으로 제조할 수 있으며, 열경화성, 열가소성이나 탄성고분자와 같은 넓은 범위의 고분자를 기질로 사용할 수 있다. PLSNs 필름은 고분자 사슬이 일정한 간격으로 쌓여있는 실리케이트에 삽입하여 간격을 넓히는 삽입형과 각각의 실리케이트 층이 고분자 기질에 불균일하게 분산되어 형성하는 박리형 두 가지 형태의 구조를 얻을 수 있다. 이러한 새로운 분야의 재료는 보통 5 wt$\%$ 이하의 소량의 clay 함유만으로도 향상된 기계적, 열적 특성을 얻을 수 있다. 그리고 clay의 함유량이 증가할수록 기체 투과경로인 tortuosity가 증가하여 기체 투과도가 감소한다.

• 식물조직배양학회지
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• 제24권3호
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• pp.137-142
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• 1997

모상근의 성장을 위한 최적배지 및 tropane alkaloids함량을 위한 최적배지를 구명하기 위하여, 독말풀(Datura stramonium var. tatula Torr.)의 잎과 줄기에 Agrobacterium spp.spp.를 접종하였다. 접종된 균주 중 모상근의 유도에 효과적인 균주는 Agrobacterium tumefaciens $\textrm{A}_{4}$ T와 A rhizogenes ATCC 15834이었다. SH (Schenk and Hildebrandt, 1972) 액체배지에서 선발된 23개의 clone중 성장이 양호한 clone은 DTLA9 이었으며, tropane alkaloids의 함량이 양호한 clone은 DTLE6 이었다. 이들 두 종류의 세포주를 9종류의 서로 다른 액체배지에 각각 배양하여 성장 및 tropane alkaloids의 함량을 조사한 결과, 모상근의 성장은 두 세포주 모두 SH와 MS배지(SH > MS배지순)에서 다른 7개의 배지에서 보다 양호하였다. 한편, tropane alkaloids의 함량은 두 세포주 공히 GD와 B5 배지(GD > B5배지순)에서 다른 7개의 배지에서 보다 높게 나타났다. 따라서 SH배지에서 모상근을 성장시킨 후, GD배지에 옮겨 2단계 연속배양하면 tropane alkaloids의 함량을 높일 수 있을 것으로 확인되었다.

• 전자공학회논문지
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• 제52권4호
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• pp.17-22
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• 2015

본 논문은 차량 간 이동 네트워크의 협력통신을 제안하고 차량 간 다중 페이딩 환경에서 고속 전송 효율성과 범위 확장을 위한 네트워크 코딩(Network coding) 기법을 제안한다. 또한 시뮬레이션 결과를 보면 제안된 전략이 가상 다중 안테나 시스템(virtual MIMO)을 설정해줌으로써 수신단에서 다이버시티 이득을 얻을 수 있다. 또한, 공간 다이버시티의 장점을 활용하여, Signal-to-Noise Ratio(SNR)을 향상시킨다. 기존 전략과 비교해보면 Inter Symbol Interference(ISI)와 Inter Channel Interference(ICI)가 완화될 뿐만 아니라 성능이 3dB만큼 훨씬 더 좋아진 결과를 확인할 수 있다. 본 논문에서는 연구의 타당성을 보이기 위해 MATLAB을 이용한 Ultra-Wideband(UWB) 통신 시스템의 시뮬레이션을 제시한다.

• 임상간호연구
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• 제17권1호
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• pp.57-69
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• 2011

Purpose: This study aimed to investigate the types of nursing organizational culture and its relationships with nurses' satisfaction with life, and job satisfaction. This study was eventually aimed to create healthier and more positive nursing organizational culture. Methods: This study utilized a descriptive correlational method to explore mediating effects of the types of nursing organizational culture on nurses' satisfaction with life and their job. Data were collected from a total of 1,801 nurses who have worked for more than 3 years in 35 different hospitals with more than 100 beds. Using SPSS 17.0 and Sobel Test Calculator, t-test, one way ANOVA, Duncan test, multiple regression and sobel test were used for data analysis. Results: The analysis showed that the nurses had a hierarchical organizational culture. Also the subjects' job satisfaction was significantly correlated with innovation, relation, and hierarchy-oriented factors and satisfaction with life. Conclusion: Innovative organizational culture is a leading factor in determining nurses' professional satisfaction. In view of the above it is recommended that strategies for creating innovative organizational culture and its application to nursing practice.

• 여성건강간호학회지
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• 제25권1호
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• pp.112-123
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• 2019

Purpose: The objective of this study was to investigate the prevalence of antenatal depression in pregnant women and its influencing factors. Methods: With a cross-sectional survey design, a total of 396 pregnant women were recruited from a local obstetrics and gynecology clinic. Measurements included antenatal depression, perceived stress, predictors of depression during pregnancy, and demographic and obstetric characteristics. Results: Mean antenatal depression score was 8.20 (standard deviation=4.95) out of 30, falling into its normal range. However, the prevalence of antenatal depression was 35.9% when cut-point of 9/10 was used. The prevalence of antenatal depression among women in the first trimester was 31.4%. It was slightly increased to 34.9% in the second trimester but significantly increased to 40.5% in the third trimester. In multiple logistic regression analysis, experiencing prenatal anxiety (odds ratio [OR], 4.16), having no job (OR, 2.90), lower self-esteem (OR, 1.62), and higher perceived stress (OR, 1.32) were significant factors influencing antenatal depression. Conclusion: Negative feeling such as feeling anxious, lower self-esteem, and higher perceived stress during pregnancy are key factors affecting antenatal depression. Thus, antenatal nursing intervention focusing on pregnant women's feeling upon their job status is necessary to improve their antenatal psychological well-being.

• 여성건강간호학회지
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• 제26권4호
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• pp.346-357
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• 2020

Purpose: This descriptive phenomenological study aimed to explore the lived experience and meaning of pregnant women's adaptation. Methods: Ten pregnant women from an ongoing Pregnant Couples' Cohort Study agreed to participate in this study. The data were collected through telephone in-depth interviews regarding what they experienced and felt about pregnancy adaptation. The qualitative data were analyzed using Giorgi's method of descriptive phenomenology. Results: Five core situation components were extracted from the raw data, along with 12 themes and 33 focal meanings. The five core situations were 1) first recognizing the pregnancy, 2) pregnancy-related changes, (3) the upcoming birth, 4) the postpartum period, and 5) parenting. The 12 themes were as follows: "anxiety, pressure, and embarrassment due to pregnancy," "efforts to adapt to physical changes," "efforts to adapt to the psychological difficulties of pregnancy," "efforts to adapt to the financial burden and role changes caused by pregnancy," "connecting with the fetus," "adapting to a new marital relationship centering on the baby," "the frustration of childbirth," "fear of childbirth," "postpartum care, need help with lactation planning," "parenting beyond what I imagined," "dad's willingness to participate in parenting," and "career disconnect and consideration of workplace needs." Conclusion: We identified that pregnant women experience adaptation in physical, psychological, relational, and social aspects. The thematic clusters identified can be used to develop nursing interventions to promote women's adaptation to pregnancy.

• 여성건강간호학회지
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• 제28권3호
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• pp.210-221
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• 2022

Purpose: The purpose of this study was to construct a hypothetical model based on Meleis and colleagues' Transition Theory and a literature review to explain women's menopausal transition, constructing a modified model considering previous studies and model fit and testing the effects between variables. Methods: With a correlational survey design, middle-aged Korean women aged 40 to 64 years who had experienced menopausal symptoms were recruited and filled out a self-administered study questionnaire. Measures included menopausal symptoms, resilience, social support, menopause management, menopause adaptation, and quality of life. The data were analyzed using SPSS 24.0 and AMOS 24.0. Results: The model fit indices were considered acceptable: 𝛘²/degree of freedom=2.93, standardized root mean residual=.07, comparative fit index=.90, and parsimonious normed fit index=.73. All eight direct-effect paths-from menopausal symptoms to support and adaptation, from support to adaptation and resilience, from resilience to adaptation and management, from management to quality of life, and from adaptation to quality of life-were significant. The explanatory power of the menopause transition model was 63.6%. Conclusion: Women who experience menopausal symptoms may be able to maintain and improve their quality of life if menopause management and menopause adaptation are successful through resilience and social support. Future research is needed to confirm whether strengthening facilitation as a nursing intervention strategy may promote healthy response patterns.

• 한일민족문제연구
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• 제32호
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• pp.35-68
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• 2017

The map where so-called 'New Religion' of Korea in the Colonial Era is entangled with 'Religion (Christianity, Buddhism, Shindo)' recognized by the Japanese Government General of Korea and nationalism. Accordingly positive research on how religious ideal and ideology in 'New Religion' in Korea was practically applied and practiced in the society is a crucial task. Meanwhile there is survey data representing the status in the long term from 1860s to early 1930s in regard to 'New Religion' of Korea in the Colonial Era. In other words it is 'Pseudo Religion in Joseon' by Murayama Jijun published in 1935. Most part of them are shown through statistics data. In particular he took a look at the distribution of 'Pseudo Religion', ups and downs of religious influence, faith consciousness, its impact and religious ideological movement and social movement. Therefore, if this statistical data could be utilized through quellenkritik, it is thought to have value of significant reference in research on Korea's 'New Religion'. This paper utilizes many statistics included in the survey data among critical review on recognition in Murayama's 'New Religion in Korea' as basic texts. During the procedure this paper seeks to look at the geology of Korean 'New Religion' and attempts basic consideration in the quantitative term related to trend and ups and downs of the groups. Through this basic research I hope that 'public concern of New Religion' in modern Korea and research on re-establishment will move forward.

• Composites Research
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• 제19권2호
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• pp.28-34
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• 2006

고온자전합성법과 스파크 플라즈마 소결법으로 여러 가지 $TiB_2$ 함유량을 갖는 $Cu-TiB_2$ 금속복합재료를 제조하였다. 점용접 전극과 미끄럼 접촉재로 사용하기 위해 인장특성, 경도, 마모저항 등의 물성치를 조사하였다. 강화재의 형상, 크기, 부피분율 등에 의해 복합재료의 특성이 달라지므로 유효물성치를 예측하기 위한 모델링이 필수적이다. 유한요소해석결과 유효탄성 계수가 실험치와 일치하는 것을 확인하였고 Eshelby 모델, Mori-Tanaka의 평균장 이론이 결합된 Eshelby 모델, 혼합법칙 등으로 복합재료의 탄성계수를 예측한 결과 Mori-Tanaka의 평균장 이론이 결합된 Eshelby 모델이 실험치를 사장 잘 묘사하는 것으로 나타났다.

• 예술인문사회 융합 멀티미디어 논문지
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• 제6권5호
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• pp.211-218
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• 2016

이 연구는 학교의 소재에 따라 학생들이 학교교육시스템에 만족하는 인식의 정도를 평가하였다. 문헌연구를 통하여 학교교육시스템과 관련된 28개의 변수를 추출하였으며, 신뢰성, 공감성, 학생지원제도, 교원능력, 주요 물리적 환경, 보조 물리적 환경의 6가지 요인이 요인분석을 통해 추출되었다. 만족도 평가는 인식 수준에 기초하여 SERVPERF 모형을 적용하였으며, 응답자와 학교 소재에 따른 차이는 각각 t-test와 ANOVA로 분석하였다. 분석 결과 교원의 능력에서는 별다른 차이점이 없었다. 그러나 농촌지역 학생들의 학교교육시스템에 대한 만족도의 인식 수준은 교원능력과 보조 물리적 환경을 제외한 모든 요인에서 도시의 학생보다 낮았다. 또한 응답자들은 자신이 소속된 학교의 소재와 관계없이 학교 시설과 프로그램 포함하여 학교교육시스템에 불만족한다는 것을 보여 주었다. 특히 자신이 소속된 학교 시설(hardware)이나 학교운영시스템(software)을 타교에 추천하겠다는 의견은 거의 없었다.