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바네사,이창인 중앙대학교 외국학연구소 2011 외국학연구 Vol.- No.15
The goal of this study is to find out how the students and parents perceive Co-teaching English class and what difficulties the students have in English class taught in English with a native English teacher and to give some suggestions to overcome these difficulties. This study has proposed three research questions, the first question is "What kind of language skill is mostly improved from Co-teaching?" The language skill that is mostly improved from Co-teaching is the speaking skill particularly "pronunciation". The students have a chance to be able to listen to an authentic pronunciation of English, and to improve their speaking skills by practicing and being corrected instantly by their native English teacher. The natural interaction between the students and native English teachers is a vital way to gain confidence to speak English and to have less fear towards foreigners. The next question is "What are some difficulties encountered by the students? The mostly mentioned difficulties that the students encountered are "hard to understand, use of difficult vocabulary/difficulty in communication, speak too fast and not enough explanation, doesn't have enough time, not organized and can't concentrate well and no Korean at all". The third question is "What are the parent's perception about Co-teaching?" The parents support their children's confidence in speaking English. They want their children to have more time and interaction with the native teacher and eventually gain speaking confidence and correct pronunciation. This maybe the reason why most of the parents send their children to private English institutions. Although at school their children have native English teacher in their English classes, the parents' perception is lack of chance for their children to personally interact with their native English teacher due to a large number of classroom size. The difficulties that students encountered and parents difficulty perceptions can be divided into three main areas: teacher-related factors, language learning content factors and other factors. The suggestions on how to deal with these difficulties are offered for teacher's inspiration.
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스마트 액추에이터를 위한 폴리이미드 및 액정 엘라스토머 이중층의 미세패터닝
성예린,최현승,송원성,바네사,김유리,류연해,김영진,임재민,김대석,최현호 한국접착및계면학회 2024 접착 및 계면 Vol.25 No.1
최근 외부 자극에 따라 팽창과 수축을 가역적으로 반복하며 형태가 변하는 소재가 주목받고 있다. 이러한 소재는 소프트 로봇, 센서, 인공근육 등 다양한 분야로의 응용가능성을 가지고 있다. 본 연구에서는고온 물질에 감응하여 이를 보호하거나 감쌀 수 있는 새로운 소재를 제안하였다. 이를 위해, 네마틱-등방성전이 성질을 지닌 액정 엘라스토머(liquid crystal elastomer, LCE)와 높은 기계적 강도와 고온 수치 안정성을지닌 폴리이미드(polyimide, PI)를 이용하였다. 용액공정으로 합성된 도프 용액을 마이크로 프린팅 기법에도입하여 mm 미만의 마이크론 선폭을 지닌 LCE/PI 이중층 구조 2차원 패턴을 개발하였다. 벌집구조로 패턴된LCE/PI 이중층 메쉬는 PI의 기계적 강도와 LCE 고온 수축 거동의 장점을 동시에 가지고 있었고, LCE 선택적프린팅을 통해 고온에서 원하는 방향으로의 변형을 유도할 수 있었다. 그 결과, 특정 고온 물질을 가역 반복적으로 감쌀 수 있는 기능을 구현하였다. 본 연구는 LCE 분자 변화에 따라 다양한 온도 구간에서 전기에너지 인가없이 기능을 구현할 수 있는 다양한 액추에이터 분야의 응용 가능성을 시사한다. Recent attention has been drawn to materials that undergo reversible expansion and contraction in response to external stimuli, leading to morphological changes. These materials hold potential applications in various fields including soft robotics, sensors, and artificial muscles. In this study, a novel material capable of responding to high temperatures for protection or encapsulation is proposed. To achieve this, liquid crystal elastomer (LCE) with nematic-isotropic transition properties and polyimide (PI) with high mechanical strength and thermal stability were utilized. To utilize a solution process, a dope solution was synthesized and introduced i nto micro-printing techniques to d evelop a t wo-dimensional p attern o f LCE/PI b ilayer s tructures with sub-millimeter widths. The honeycomb-patterned LCE/PI bilayer mesh combined the mechanical strength of PI with the high-temperature contraction behavior of LCE, and selective printing of LCE facilitated deformation in desired directions at high temperatures. Consequently, the functionality of selectively and reversibly encapsulating specific high-temperature materials was achieved. This study suggests potential applications in various actuator fields where functionalities can be implemented across different temperature rang es w ithout t he n eed f or e lectrical energy input, c onting ent upon m olecular c hang es i n LCE.
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