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전시컨벤션센터 서비스스케이프가 참관객만족과 행동의도에 미치는 영향 -aT 센터를 대상으로-
장윤희 ( Yun Hee Jang ) 한국이벤트컨벤션학회 2015 이벤트 컨벤션 연구 Vol.11 No.2
The purpose of this study is investigate the impact of the servicescape on exhibition attendees`` satisfaction and behavioral intentions in exhibition & convention center. It is hypothesized that perceived quality of convention center``s servicescape will have a positive impact on exhibition attendees`` satisfaction and the behavioral intention. For this study purpose, total 106 data were collected from exhibition attendees who participated the ``Korea Pet show`` held in aT center. SPSS ver. 12.0 was used to analyze the data and descriptive and regression analysis were used. The result of an exploratory factor analysis revealed five internal environment factors and two external environment factors. Among those factors, four internal factors (cleanliness, pleasantness, facility aesthetics, internal accessibility) and one external factor(attractiveness) had a positive effect on exhibition attendees`` satisfaction and their revisit and recommendation intentions.
비화학양론적 전구체 조성 조절을 통한 페로브스카이트 태양전지의 개방전압 향상
윤희선(Hee-Sun Yun),장윤희(Yoon Hee Jang),이도권(Doh-Kwon Lee) 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.1
The interest in perovskite solar cells has been skyrocketed owing to their rapid progress in efficiency in recent years. Here, we report the effect of non-stoichiometry in the methylammonium lead trihalide (MAPbI₃) precursors used in a solution process with different MAI : PbI₂ ratios of 1 : 0.96, 1 : 1.10, 1 : 1.15, and 1:1.20. With an increase in the PbI₂ content, the PbI₂ secondary phase was found to form at grain boundary region of perovskite thin films, as evidenced by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In terms of device performance, open-circuit voltage in particular is significantly improved with increasing the molar ratio of PbI₂, which is possibly ascribed to the reduction in recombination sites at grain boundary of perovskite and hence the prolonged life time of light-generated carriers according to the reported. As a result, the PbI₂-excess devices exhibited a higher power conversion efficiency compared to the MAI-excess ones.
카탈라제를 생산하는 고초균 (Bacillus sp.)의 고정화 및 과산화수소 분해 특성
한경아(Kyung-Ah Han),장윤희(Yun-Hee Jang),이종일(Jong Il Rhee) 한국생물공학회 2010 KSBB Journal Vol.25 No.6
토양 미생물로부터 스크리닝한 미생물 중 카탈라제 생산량이 높은 세 가지 미생물 (Bacillaceae bacterium BKBChE-1, Bacillus sp. BKBChE-2와 Bacillus flexus BKBChE-3)을 배양하여 얻은 카탈라제 효소가 과산화수소를 분해하는 것을 확인하고, 미생물 균체를 천연제올라이트에 정전기적 흡착법으로 고정하였다. 주사전자 현미경을 통해 각각의 미생물이 지지체에 잘 흡착된 것이 관찰되었고, 10.5 mM의 과산화수소를 1시간 이내에 완전히 분해되는 것을 확인하였다. 과산화수소 분해 속도가 가장 빠른 Bacillus flexus BKBChE-3은 온도와 pH 영향성 실험을 통해 고온과 pH 10 이상의 강알칼리 조건에서도 30일 이후까지 미생물이 생존하는 것을 관찰하였다. 또한 고정화된 미생물의 경우 온도 25-40℃, pH 7-10의 조건에서 생균수가 계속하여 증가하는 것을 확인하였다. 본 실험을 통해 Bacillus flexus BKBChE-3이 생산한 카탈라제효소 뿐만 아니라 고정화된 균체도 과산화수소의 제거에 효과적임을 확인할 수 있었다. 이들 결과로부터 미생물 발효를 통해 생산된 효소의 생산량 증가와 미생물 개체 수 증가를 이용하여 산업폐수에 적용하면, 과산화수소의 제거 효율을 높이고 균체 재활용을 통한 공정비용을 절감할 수 있을 것으로 사료된다. In this work we have investigated the production of catalase from Bacillus sp. strains, which were screened and identified from soil. These strains were cultivated in shaking flasks with tryptic soy broth (TSB) at 30℃ and 200 rpm. Effects of the temperature and pH on the stability of the native catalase and whole cell viability were studied in the temperature range of 25-60℃ and the pH range of 7-13. Korean natural zeolite was added to culture medium and mixed with microorganisms for 24 hours. The native catalase maintained its activity over 50℃. The enzyme acitiviy of the catalase from Bacillus flexus BKBChE-3 was highest among the Bacillus sp. strains studied. Bacillus flexus BKBChE-3 and immobilized Bacillus cells have survived under extreme conditions of over 50℃ and pH 12. 60 mL of 10.5 mM H2O2 solution were entirely removed within 1 hour with catalase produced from Bacillus sp. on the flask. When Bacillus cells were immobilized on Korean natural zeolite, colony forming unit of Bacillus flexus BKBChE-3 was increased and high efficiency of hydrogen peroxide removal was observed.