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Teachers' Self-Images in Multicultural Classrooms: Who am I?
Yuling L. SU 환태평양유아교육연구학회 2008 Asia-Pacific journal of research in early childhoo Vol.2 No.1
The purpose of this hermeneutic phenomenological study, conducted in southern Virginia, United States, was to understand six teachers' own images through the experiences teaching preschoolers from diverse cultural and linguistic backgrounds. Semistructured interviews were conducted with six teachers from two day care and development centers. Observations of classroom teaching added vital information to the data collected through interviews. Other tools for data collection included field notes and a researcher's reflective journal. Strategies for examining the data in this study were thematic and constant comparative analysis. Five major themes of teachers' self-images emerged from their reflection on the roles in multicultural classrooms were: ( 1) Teachers are advocators for promoting social justice, (2) Teachers are learners of cultural diversity, (3) Teachers are transformers through caring, (4) Teachers are supporters for children's emotional and social needs, and (5) Teachers are facilitators of social reciprocity. The findings also suggested recommendations for future research and practice in the field of early childhood education.
혼화재 및 혼화제의 조절에 의한 서중 콘크리트의 효과적 관리
이동율 ( Dong Yule Lee ),함수윤 ( Su Yun Ham ),오태근 ( Tae Keun Oh ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.3
본 연구는 슬럼프 감소, 연행 공기 부족, 건조수축 균열, 강도감소 등 굳지 않은 콘크리트와 굳은 콘크리트의 성질에 대한 타설시 고온의 악영향에 대한 원인분석을 실시하고 이를 경감시키기 위한 감수제, 공기연행제, 지연제 등의 화학적 혼화제와 플라이 애쉬, 고로 슬래그 등의 무기질 혼화재의 다양한 적용이 검토되었다. 즉, 서중 콘크리트의 품질향상을 위한 다양한 콘크리트 배합이 설계되고 각 배합에서의 굳지 않은 콘크리트 및 굳은 콘크리트 에 대한 영향이 분석되고 몇 가지의 최적 배합이 도출되었다. The undesirable effects of elevated external temperatures at placement on the properties of the fresh and hardened concrete are discussed briefly, and the possible use of the mineral admixtures to mitigate them and the association with water-reducing and retarding admixtures in terms of the mix design which are critical for minimizing slump loss and entrained air loss are examined in this study. To investigate the effects of such the mineral and chemical admixtures on the fresh and hardened properties of concrete exposed to high temperature, a series of concrete mixtures subjected to the high temperature were carried out and then fresh and hardened properties of the mixtures were analyzed and evaluated. Based on the results, new guide lines concerning the appropriate admixtures for hot weather are suggested.