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Polyurethane과 Poly(Ethylene Oxide)를 이용한 hybrid 나노섬유 지지체의 제작
신지원,신호준,허수진,김지희,황영미,김동화,신정욱,Shin, Ji-Won,Shin, Ho-Jun,Heo, Su-Jin,Kim, Ji-Hee,Hwang, Young-Mi,Kim, Dong-Hwa,Shin, Jung-Woog 대한의용생체공학회 2006 의공학회지 Vol.27 No.5
The object of this study is to investigate the potential of dual-electrospun polymer based structure for vascular tissue engineering, especially for the medium or small sue blood vessels. Polyurethane(PU), which is known to be biocompatible in this area, was electrospun with poly(ethylene oxide) (PEO). Concentration of PU was fixed at 20wt%, while that of PEO was set from 15 to 35wt%. Morphological features were observed by SEM image and measurement of porosity and cellular responses were tested before and after extracting PEO from the hybrid scaffolds by immersing the scaffolds into distilled water. The diameter of PEO fibers were ranged from 200nm to 500nm. The lower concentration of PEO tended to show beads. The porosity of the scaffolds after extracting PEO was highly increased with higher concentration of PEO as expected. Also, higher proliferation rate of smooth muscle cells was observed at higher concentration of PEO than at the lower concentration and without PEO. As conclusions, this dual electrospinning technique combined with PU and PEO is expected to overcome the current barrier of cell penetration by providing more space for cells to proliferation.
강화 남부 조간대에 서식하는 칠면초(Suaeda japonica)의 연간 생장 및 생산 양상
황지원,이균우,박흥식,Hwang, Ji-won,Lee, Kyun-Woo,Park, Heung-sik 한국해양과학기술원 2022 Ocean and Polar Research Vol.44 No.2
This study examined the growth pattern and environmental factors affecting the growth of the halophyte, Suaeda japonica, which is prevalent on tidal flats in the west coast of Korea in order to calculate annual carbon production. Quantitative sampling was conducted every month for three years from 2018 to 2020 on salt marshes located on the southern coast of Ganghwa Island. In terms of annual density affected by the germination rate at first period, especially when air temperature for winter time was constantly below 0℃ for long periods of time, germination decreased and precipitation in summer also exerted an influence. In terms of annual growth with regard to length, the part below the ground grew rapidly in the beginning after budding, while the part above ground grew at a relatively steady rate at all times. With regard to biomass, the part below the ground also increased from April in a manner similar to length growth, but decreased drastically from September with leaves falling off and water loss occurring. The part above ground showed a rapid increase from the beginning of the rainy season. Size-frequency distribution revealed broader patterns after the rainy season as individual growth varied, but from September, it stopped at all year. High growth rates were recorded in the initial phase of growth after budding and growth was rapid, but growth declined in summer when biomass increased. The annual mean production based on growth rate was calculated at 352 gDWt/m<sup>2</sup>/yr, and the highest production was 519 gDWt/m<sup>2</sup>/yr in 2018, but it has decreased since 2019. Annual carbon production was at calculated 143.41 gC/m<sup>2</sup>/yr for Suaeda japonica in the vicinity of the southern coast of Ganghwa Island.
유아특수교사의 공감피로와 소진: 공감만족과 사회적 지지의 조절효과 분석
황지원 ( Hwang¸ Ji-won ),손지향 ( Sohn¸ Ji-hyang ),한민경 ( Han¸ Min-kyung ) 대구대학교 특수교육재활과학연구소 2021 특수교육재활과학연구 Vol.60 No.3
본 연구는 유아특수교사의 공감피로와 소진과의 관계성을 분석하고, 두 변인의 관계에서 공감만족과 사회적지지 (예: 공감피로에 대한 보호요인)가 조절효과가 있는지도 알아보았다. 연구문제는 첫째, 유아특수교사의 소진에 대한 공감피로, 공감만족, 사회적 지지의 영향력은 어떠한가? 둘째, 유아특수교사의 소진과 공감피로간의 관계성에서 공감만족, 사회적 지지의 조절효과는 어떠한가? 이다. 연구대상은 유치원 및 장애전담 어린이집에 근무하는 193명의 유아특수교사이다. 연구결과, 첫째, 유아특수교사의 소진 변인과 공감피로, 공감만족, 사회적 지지간의 유의한 상관관계가 있었고, 유아특수교사의 소진에 공감피로는 부적영향력, 공감만족, 사회적 지지는 정적 영향이 있었다. 둘째, 유아특수교사의 소진과 공감피로간의 관계성에 있어 공감만족 및 사회적 지지의 조절효과는 유의하지 않았다. The current study aimed to a relationship between compassion fatigue and burnout of early childhood special education teachers(ESCT); and whether compassion satisfaction and social support (i.e., protective factors of compassion fatigue) moderate this relationship. Data was collected from a total of 193 ECST who work at public kindergartens or childcare centers, which identified themselves as institutions specialized in education for children with disabilities Our findings found a significant effect of compassion fatigue on burnout of ESCT: however, the effect was not dependent on compassion satisfaction and social support. Our findings imply the importance of teaching self-care or -management strategies to teachers, cultivating respectful school climates, and exploring potential variables that have buffering effects on compassion fatigue and burnout.