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손선영(Sunyoung SON),Shin-ichi NISHIDA,이종형(Jong-hyung LEE),김영태(Young-tae KIM),이도경(Do-kyung LEE),손용제(Yong-jea SON),장현덕(Hyun-duck Jang) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.4
새로운 티타늄기 MMCs(W/ Ti-6Al-4V)에 대한 기계적 특성에 대한 연구를 행하여 평가한 결과를 나타내었다. HIP(hot isostatic pressing) 제조법과 RS(Rotary Swaging) 2 차 가공을 통하여 텅스텐 섬유 함유율이 각각 6, 9, 12 vol%인 W/Ti-6Al-4V MMCs 를 제작하였으며, 경도는 기존의 Ti-6Al-4V 합금과 비교하여 20-30%, 인장강도는 50%(비강도-38%) 높은 값을 얻었다. 섬유 함유율 9vol.% 에서 가장 높은 인장 값을 나타내었으며, MMCs 에서 메트릭스와 계면 사이에 생성된 확산상에 의해서 경도 및 인장강도가 향상되었다. 또한 피로 강도를 향상 시키기 위한 방법으로 메트릭스의 질적 향상을 위한 HIP 제작조건에 대한 추가적인 연구가 필요하다. The objective of this study is the estimation of the mechanical properties of HIP-treated MMCs by an optimized manufacturing process. The Ti-MMCs were fabricated by HIP and rotary swaging (RS) for secondary processing. The Ti-MMCs with different tungsten fiber contents of 0, 6, 9, and 12 vol% were subjected to tensile tests, fatigue tests, and hardness tests. The results show that the hardness values of Ti-MMCs increased with the increasing volume percent of tungsten fibers, the tensile strength increased by approximately 50% (specific strength: 38%) at the 9 vol%. The value of tungsten-fiber orientation F affects the tensile strength. The fatigue strengths of the Ti-MMCs did not improve. HIP is a useful manufacturing method for Ti-MMCs and RS is an important process for improving fiber orientation during secondary processing.
일방향 탄소섬유강화 복합재료의 기계적 성질에 미치는 수 환경의 영향
손선영(Sun-Young Son),김재동(Jae-Dong Kim),고성위(Sung-Wi Koh) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.4
The purpose of this paper is to investigate the water environmental effect on the mechanical properties of carbon fiber/epoxy composites. Moisture concentration absorbed in CFRP under various water environment was calculated and degradation of mechanical properties for each wet composite laminates is investigated by performing the flexual and tensile test.<br/> The results show that moisture absorption is accelerated in higher temperature environment and under the same temperature sea water environment prompts more absorption than fresh water. As increasing the water temperature and moisture concentration tensile and flexual strength decreased as much as 25%~40% compared with dry condition.
모바일 기반 게임 어휘 학습 활동이 중학교 영어학습자의 어휘 학습 및 태도에 미치는 영향
손선영 ( Son Sun-young ) 한국멀티미디어언어교육학회 2018 멀티미디어 언어교육 Vol.21 No.2
The purpose of this study is to investigate the effects of using mobile-based vocabulary game activities on Korean middle school students' vocabulary learning and attitudes. The participants of the study were 43 middle school students learning English, who were divided into two groups: an experimental group with learning activities using a mobile-based vocabulary game program and a control group using traditional vocabulary learning activities. The major results of the study were as follows: First, with respect to vocabulary learning, the students in the experimental group showed a significantly higher score on a post-test compared to the control group students. Second, the experimental group’s scores were higher than the control group in both vocabulary pronunciation and spelling tests listening to the pronunciation. Third, in the survey the participants demonstrated positive attitudes toward vocabulary learning using the mobile-based vocabulary game program. Such results indicate that the use of a mobile-based game vocabulary program helps learners to learn not only the spelling of vocabulary and its single meaning but also the multilateral vocabulary learning such as listening and pronunciation. Therefore, teachers may use learner's mobile-based vocabulary game programs to inspire students’ interest in vocabulary learning, and encourage self-directed vocabulary learning.