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최재영 팬코리아영어교육학회 2004 영어교육연구 Vol.16 No.3
In Korean elementary English education, writing has not been given proper attention while major language acquisition studies consent on the beneficial effect of teaching oral and written language modes together. On the other hand, influenced by the philosophy of whole language, English picture storybooks have been used as a teaching tool in the form of story telling mainly outside the mainstream school system. This article explores possibilities of linking picture storybooks, children’s literature to writing in the elementary English classroom. It, first, looks into the significance of meaningful writing in L2 children’s literacy development. Then, it points out negative aspects of traditional methods of teaching writing for L2 child. On the basis of this understanding, this article seeks out characteristics of picture storybooks which enable meaningful writing in L2 children’s learning. The article concludes that a picture storybook is an effective language material for L2 children’s writing. As a result, it recommends using picture storybooks for extensive reading and as a springboard for authentic writing in the elementary English classroom.
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Topoisomerase Ⅰ and Ⅱ Inhibitory Constituents from the Bark of Tilia amurensis
최재영,서창섭,Ming-Shan Zheng,이종순,손종근 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.11
Two coumarins (1 and 6), one flavan-3-ol (2), one fatty acid (3), and two lignan glycosides (4 and 5) were isolated from the EtOAc and CH₂Cl₂ extract of the bark of Tilia amurensis. Their chemical structures were identified by comparing their physicochemical and spectral data with those of published in literatures. Compounds 4, 5, and 6 were isolated from Tilia genus for the first time. Compounds 2 and 3 showed potent inhibitory activity against both DNA topoisomerase Ⅰ (IC50 values; 49 μM and 4 μM, respectively, with 18 μM of positive control compound, comptothecin) and DNA topoisomerase Ⅱ (IC50 values; 13 μM and 3 μM, respectively, with 50 μM of positive control compound, etoposide). However, all compounds did not showed cytotoxicity against the human colon adenocarcinoma cell line (HT-29), the human breast adenocarcinoma cell line (MCF-7), and human liver hepatoblastoma cell line (HepG-2).
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A 5-20 GHz 5-Bit True Time Delay Circuit in 0.18 mm CMOS Technology
최재영,조문규,백동현,김정근 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.3
This paper presents a 5-bit true time delaycircuit using a standard 0.18 μm CMOS process forthe broadband phased array antenna without thebeam squint. The maximum time delay of ~106 pswith the delay step of ~3.3 ps is achieved at 5-20 GHz. The RMS group delay and amplitude errors are < 1ps and <2 dB, respectively. The measured insertionloss is <27 dB and the input and output return lossesare <12 dB at 5-15 GHz. The current consumption isnearly zero with 1.8 V supply. The chip size is 1.04 ×0.85 mm2 including pads.
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도시공간구조와 보행자이동을 고려한 도시관광코스 설정에관한 연구
최재영,오준호,유우상 한국문화공간건축학회 2013 한국문화공간건축학회논문집 Vol.- No.44
Gwangju has a plan for Urban Regeneration in an old urban center where it has witnessed the decrease of population and economic vitality. Gwangju tries to draw more tourists to the old urban center by introducing a large-scale cultural project. The Asia Culture Complex (ACC) scheduled to be completed in 2014 is the biggest cultural facility in Asia. It is supposed to bring many changes in urban spatial structure and to attract more tourists. This study, utilizing Space Syntax modeling, analyzes the spatial structure of the old urban center in Gwangju and predicts the changes in urban structure after the ACC will begin operated. It finally attempts to suggest city tour routes in the old urban center and analyzes their spatial properties in relation to urban tourism.
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