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최민석,김정두 대한기계학회 1993 대한기계학회논문집 Vol.17 No.10
Lapping is a very complicated and random process resulting from the variation of abrasive grains in its sizes and shapes and from the numerous factors having an effect on the process quality. Thus it needs to be analyzed by experimental method rather than by theoretical method to obtain the relative effects of factors quantitatively. In this study, cylindrical lapping experiment designed by Taguchi's L8 orthogonal array was performed and analyzed by Yates' ANOVA table. As a result, effective factors and interaction effects were identified and discussed. Also the optimal factor combination to obtain the largest improvement of surface roughness was selected and confirmatory experiments were peformed.
최민석 한국응용언어학회 2011 응용 언어학 Vol.27 No.3
This paper presents the effectiveness of shadowing technique for enhancing L2 listening and the general perception of Korean middle school students on the technique. The study was conducted through two experimental groups—listening only (LO) and shadowing and listening (SL)—and a questionnaire survey of 58 middle school students. As a result, shadowing technique was shown to be effective by the effects of attention through noticing, increased awareness of suprasegmental features, and the participants were shown to have positive attitude toward the technique in respect of perception, anxiety, and preference, which were the affective factors that might have contributed to enhancing listening ability. The overall result of the study reaffirmed previous studies of Chung (2010) and Kim (2008) with suggestions of several important issues regarding what should be seriously considered for improvement in English language teaching.