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담배저장해충(Lacioderma Serricornine F .) 의 성유인 물질에 관한 고찰
신성철,양광규,김근수 한국농화학회 1989 Applied Biological Chemistry (Appl Biol Chem) Vol.32 No.1
Cigarette beetle(Lacioderma serricornine F.) is a serious pest of cured tobacco leaves. Of its pheromonal components, serricornin shows the strongest sexual stimulation. Other substances contribute as the supplementary factors cooperating with this component in the copulation of cigarette beetle. From spectroscopic evidence and synthetic studies, the structure of natural serricornin has been determined to be (4S, 4S, 7S)-4, 6-dimethyl-7-hydroxynonan-3-one. It has been suggested that the pheromonal components isolated from this beetle may be derived from polyketide biosynthesis. Two nonasymmetric syntheses of serricornin will be reviewed in detail.
Heritage language learning: A needs analysis study on Korean-Australian tertiary students
신성철,고성배,류영주 국제한국어교육학회 2016 한국어 교육 Vol.27 No.1
This study aims to identify the needs of Korean heritage language learners in relation to learning (or the prospect of learning) their heritage language and culture. Heritage language (HL) education has recently become an emerging field of inquiry within Australia. However, little empirical information is available in relation to Korean heritage students’ needs that identify their language use, attitudes, motivation, and learning preferences such as learning styles and learning areas. To address these issues, the study has conducted online surveys of Korean heritage students enrolled in three Australian universities, and analyzed data collected from 52 students. The survey consists of questions on (a) language use and maintenance; (b) attitudes and motivation; (c) preferred learning styles; and (d) preferred learning areas. The results of the analysis indicate that Korean heritage students have their own needs, interests and preferences in relation to their heritage language learning. The study describes and explains each of these topical issues, and then offers discussions of practical implications in the provision of adequate courses for heritage students and the development of high quality teaching resources.
Locative Substitution Errors by English L1-KFL Learners
신성철 한국언어문화교육학회 2008 언어와 문화 Vol.4 No.1
본 연구는 영어권 한국어 학습자가 빈번히 범하는 격조사 오류 가운데 처소격 조사의 대치 오류에 초점을 맞추어 그 오류의 빈도수를 측정하고 오류의 패턴 및 주요 오류 원인을 알아보는 데 있다. 이를 위해 3개 대학 한국어 학습자가 작성한 정규 작문 시험지에 나타난 문법 오류 가운데 조사 오류를 분석하였다. 조사 오류의 대부분인 대치 오류 가운데 처소격 조사의 대치 오류 빈도가 목적격과 주격 조사의 대치 오류 빈도 다음으로 높았다. 이는 김미옥(2002), 이정희(2003) 등의 오류 분석 선행 연구를 뒷받침하는 것이나 지금까지 처소격 조사 ‘–에’와 ‘–에서’의 대치 오류 원인에 대해서는 적절한 설명이 없거나 부족하였고 교육자의 직관에 맡겨 놓았던 것이 사실이다. 본 연구에서는 언어교육학적 관점과 교재 분석을 통해 오류 원인을 설명하고 교재 개발 시나 교정 교육 시에 도움이 될 수 있는 몇 가지 방법을 제시한다.
Effects of Interface Properties on the Onset Thickness of Ferromagnetism in the Co/InP Hybrid System
신성철,박용성,정종율 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We have investigated the effects of interface structures on the magnetic properties of the Co/InP hybrid system by using in situ surface magneto-optical Kerr effects (SMOKE), scanning tunneling microscopy (STM) and Auger electron spectroscopy (AES). InP(001) substrates with different surface characteristics were prepared by using cycles of ion bombardment and annealing (IBA) method while varying the annealing temperature from 400 ℃ to 450 ℃. The Co film begins to show a ferromagnetic hysteresis loop at a thickness of 2 nm of Co on the InP surface prepared at 400 ℃. However, the Co film deposited on the InP surface prepared at 450 ℃ shows no ferromagnetic signal up to a Co thickness of 16 nm. We observed from STM results that In droplets were produced when the InP substrate was annealed at temperatures higher than 400 ℃ during the IBA processes. The AES depth profile shows that interdiffusion between Co and In increases as the density of In droplets increases. These In droplets strongly interact with Co atoms and play a crucial role in the onset thickness for ferromagnetism in Co films.