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SiO2 나노입자가 분산된 TiO2 나노섬유의 제작 및 광촉매 특성 분석
최광일 ( Kwang Il Choi ),이우형 ( Wooh Young Lee ),백수웅 ( Su Wung Beak ),송진호 ( Jin Ho Song ),이석호 ( Suk Ho Lee ),임철현 ( Cheol Hyun Lim ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.5
In this study, we suggest a facile method to control conditions of single component independently when preparingconsisting two-component metal oxides nanofiber by simply dispersing nanoparticles in precursor solution. Thewell dispersed SiO2 nanoparticles in TiO2 nanofibers were successfully synthesized through a simple electrospinningprocess. The as-synthesized nanodfibers were investigated via FE-SEM, XRD and EDS for structural studies, furthermore,the analysis of UV-VIS and photocatalytic activity were carried out for demonstrate the effect of SiO2 nanoparticles dispersedin TiO2 nanofibers. As a result, TiO2 nanofibres dispersed with SiO2 nanoparticles have enhanced photocatalytic activitythan that of TiO2 nanofibres only. In this strategy, the introduction of SiO2 nanoparticles in TiO2 nanofibers were attribute toenlarge absorption in the visible region (380~440 nm). Additionally, Brønsted acid sites generated in each metal oxide ofTi and Si increase OH radicals efficiently as well as it limit recombination loss by holding photogenerated electrons forhigh efficient photocatalytic activity.
어린이집 보육교사의 감정부조화, 직무소진이 정신건강에 미치는 영향
최광일(Kwang Il Choi),이원재(Won Jae Lee) 대한방사선과학회(구 대한방사선기술학회) 2016 방사선기술과학 Vol.39 No.4
이 연구는 어린이집 보육교사의 감정부조화, 직무소진과 정신건강 간의 연관관계를 규명하는 것을 목적으로 467 명의 보육교사를 대상으로 조사하였으며, 5점 척도로 구성한 측정도구를 활용하였다. 수집된 자료는 통계패키지 IBM SPSS 23과 AMOS 21을 사용하여 유의수준 5% 수준에서 검정하였다. 주요 결과는 다음과 같다. 첫째, 어린이 집에 종사하는 보육교사의 감정부조화가 정신건강 하위요인 중 직무스트레스(학부모관계, 업무과부하)에 유의한 영향을 미치는 것으로 나타났다. 둘째, 감정부조화는 직무소진에 모두 유의한 영향이 있는 것으로 나타났다. 셋째, 직무소진은 정신건강 하위요인인 직무스트레스, 심리적 안녕감에 부분적으로 유의한 영향을 미치고 있었다. 넷째, 직무소진은 감정부조화와 정신건강에 대해 부분적 매개효과가 있는 것으로 나타났다. 이러한 연구결과는 어린이집 에서 종사하는 보육교사의 정신건강 증진의 중요성을 제시하고 있으며, 정신건강 증진을 위한 제도적 지원을 모색 할 필요성을 시사한다 This study collected data from 467 nursery teachers and it aimed to investigate the association between mental health and emotional dissonance and job burnout of the day care nursery teachers. Measurement tool was developed, most of the questions having 5-point scale. The data were analyzed structural equation model with the statistical package IBM SPSS 23 and AMOS 21 with 5% percent of significance level. Main results are as follows. First, it was found that emotional dissonance of nursery teachers working in day care centers showed significant effect on the mental health such factors as job-stress (relationships with children and parents and work overload). Second, emotional dissonance were found to have a significant effect on job burnout, too. Third, job burnout had a significant effect on the mental health, job stress and psychological wellbeing. Fourth, job burnout was found to mediate partially on mental health and emotional dissonance. These findings suggest the importance of mental health promotion programs for child care teachers working in the day care centers.
최광일(Kwang-Il Choi),A. S. Pamitran,오종택(Jong-Taek Oh),Pega Hrnjak,박창용(Chang Yong Park) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.12
Two-phase flow boiling heat transfer of R-410A in horizontal small tubes was reported in the present experimental study. The local heat transfer coefficients were obtained over a heat flux range of 5 to 40 ㎾/㎡, a mass flux range of 170 to 600 ㎏/㎡s, a saturation temperature range of 3 to 10 ℃, and quality up to 1.0. The test section was made of stainless steel tubes with inner diameters of 0.5 and 3.0 ㎜, and lengths of 330 and 3000 ㎜, respectively. The test section was heated uniformly by applying a direct electric current to the tubes. The effects on heat transfer of mass flux, heat flux, inner tube diameter, and saturation temperature were presented. The experimental heat transfer coefficients are compared with six existing heat transfer coefficient correlations. A new boiling heat transfer coefficients correlation based on the superposition model for R-410A in small tubes was developed with mean deviation of 10.13%.