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이상섭,이창헌,즈엉 짱 안,김동혁,김병우,한형수,이재신,Lee, Sang Sub,Lee, Chang-Heon,Duong, Trang An,Kim, Dong Hyeok,Kim, Byeong Woo,Han, Hyoung-Su,Lee, Jae-Shin 한국재료학회 2021 한국재료학회지 Vol.31 No.10
(Bi<sub>1/2</sub>Na<sub>1/2</sub>)TiO<sub>3</sub> (BNT)-based ceramics are considered promising candidates for actuator application owing to their excellent electromechanical strain properties However, to obtain large strain properties, there remain several issues such as thermal stability and high operating fields. Therefore, this study investigates a reduction of operating field in (0.98-x)Bi<sub>1/2</sub>Na<sub>1/2</sub>TiO<sub>3</sub>-0.02 BiAlO<sub>3</sub>-xSrTiO<sub>3</sub> (BNT-2BA-100xST, x = 0.20, 0.21, 0.22, 0.23, and 0.24) via analyses of the microstructure, crystal structure, dielectric, polarization, ferroelectric and electromechanical strain properties. The average grain size of BNT-${\underline{2}}$BA-100xST ceramics decreases with increasing ST content. Results of polarization and electromechanical strain properties indicate that a ferroelectric to relaxor state transition is induced by ST modification. As a consequence, a large electromechanical strain of 592 pm/V is obtained at a relatively low electric field of 4 kV/mm in 22 mol% ST-modified BNT-2BA ceramics. We believe that the materials synthesized in this study are promising candidates for actuator applications.
이상섭,이창헌,즈엉 짱 안,웬 호앙 티엔 코이,한형수,이재신,Lee, Sang Sub,Lee, Chang-Heon,Duong, Trang An,Nguyen, Hoang Thien Khoi,Han, Hyoung-Su,Lee, Jae-Shin 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.1
This study investigated the structural, dielectric, ferroelectric, and strain properties of (0.98-x)Bi1/2Na1/2TiO3-0.02BiFeO3-xSrTiO3 (BNT-BF-100xST, x=0.20, 0.22, 0.24, 0.26, and 0.28). All samples were successfully synthesized using the conventional solid-state reaction method and sintered at 1,175℃ for 2 h. The average grain size of the BNT-BF-100x ceramics decreased with increasing ST content. Furthermore, we observed that the ferroelectric- relaxor transition temperature (TF-R) decreased with increasing ST content, which eventually vanished in the BNT-BF-24ST ceramics. The results indicated that a ferroelectric to relaxor phase transition could be induced by ST modification. Consequently, a large electromechanical strain of 633 pm/V at 4 kV/mm was observed for the BNT-BF-26ST ceramics. These results imply that our materials have the competitive advantage of larger strain under lower operating field conditions compared with other BNT-based lead-free piezoelectric ceramics. We expect that BNT-BF-ST lead-free piezoelectric ceramics are promising candidates as a novel ternary BNT-based system and can find potential applications in actuators.
체육수업에 대한 교과 흥미도가 학생들의 학업열의에 미치는 영향
이상섭(Lee, Sang-Sub),조홍식(Cho, Hong-Sik) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.1
The purpose of this study was to investigate the effects of subject interest in physical education classes on academic engagement among students. For that purpose, the investigator found the population in middle and high school students in Gyeonggi Province and sampled 420 students through convenience sampling. Collected data were put to multiple regression analysis with the PASW Version 18 .0 statistical program. The findings were as follows: First, all the sub-factors of subject interest in physical education classes had statistically significant effects on academic engagement(efficacy). Second, all the sub-factors of subject interest in physical education classes had statistically significant effects on academic engagement(commitment) . Third, all the sub-factors of subject interest in physical education classes had statistically significant effects on academic engagement (vitality). Finally, all the sub-factors of subject interest in physical education classes had statistically significant effects on academic engagement (absorption)
체육수업의 재미요인이 학생들의 심리적 유인성향에 미치는 영향
이종철(Lee Jong-Chul),조홍식(Cho Hong-Sik),박윤혁(Park Yoon-Hyuk),이상섭(Lee Sang-Sub) 한국체육과학회 2006 한국체육과학회지 Vol.15 No.3
The purpose of this study was to explore ways to at identifying what factors made students felt enjoyment during physical education class and how much those factors influence on psychological of inducement inclination. To this end, Cluster Random Sampling was used to set up the population with boys and girls middle school students in Kyunggi-do and Inchon-si area. The survey tool was questionnaire and Collected data hereof were analyzed by one way ANOVA analysis and Multiple Regression Analysis with SPSS WIN Ver 11.5. The aforementioned method and procedure led this research to the conclusion as follows. Firstly, out of sub-factors of physical education class enyoyment by middle schoolers' individual characteristics(gender, result), boy students showed more than girl students, in which there were statistically significant difference. Meanwhile, statistically significant difference was not found in free time, explanation and modeling. Secondly, out of sub-factors of psychological of inducement inclination by middle schoolers' individual characteristics(gender, result), boy students' response was higher in senses of confidence, enthusiasm, accomplishment and indulgence than girl students' in which all considers appeared. Thirdly, the effect enjoymant factors of physical education class had statistically significant on sub-factors of psychological of inducement inclination senses of confidence, enthusiasm, accomplishment and indulgence, free time that is a sub-factor of enjoymant which did not had statistically significant influenced on sense of accomplishment.
체육수업에 대한 교과 흥미도가 학생들의 기본적 심리욕구에 미치는 영향
이종철(Lee, Jong-Chul),이상섭(Lee, Sang-Sub) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.6
The purpose of this study is to identify effects of subject interest in physical education on basic psychological desires of students. For doing this, the authors established the students in middle and high schools in Gyeonggi Province as the population, selecting 340 students by using convenience sampling. The collected data was conducted of multiple regression analysis by using the PASW Ver 18.0 statistic program, and the results are as follows. First, the subject interest in physical education had statistically significant effects on the basic psychological desires of the students(competence), but among the sub-factors, teacher preference factors did not have significant effects on the basic psychological desires(competence). Second, all the sub-factors of the subject interest in physical education(teacher preference, subject content, values & efforts, and subject competence) had statistically significant effects on the basic psychological desires of the students(relation). Third, the subject interest in physical education had statistically significant effects on the basic psychological desires of the students(autonomy), but among the sub-factors, teacher preference factors did not have significant effects on the basic psychological desires(autonomy).
체육교사의 자율성 지지와 학생들의 교과 흥미도 및 수업참여와의 구조적 관계
이상섭(Lee, Sang-Sub),조홍식(Cho, Hong-Sik) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.3
The purpose of this study was to examine substantially structural relations between physical educator’s autonomy support, subject interest and Class Participation in physical education class. The subjects of this study were 450 middle and high school students in Gyeonggi Province, sampled by convenience sampling. The data was applied of confirmatory factor analysis and structural equation model(SEM) analysis by using the PASW Ver 18.0 and the AMOS 18.0. Based on the results, First, for individual consideration of physical educator’s autonomy support appeared to have significant influence to the subject interest. Second, for individual consideration of subject interest appeared to have significant influence to the Class Participation. Third, the physical educator’s autonomy support variables appeared to have significant influence to the academic engagement. Fourth, indicated that subject interest mediated the relationship between physical educator’s autonomy support and Class Participation in physical education class.
체육수업에서 교사-학생관계 및 교우관계가 학생들의 학업열의에 미치는 영향
이상섭(Lee, Sang-Sub),조홍식(Cho, Hong-Sik) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5
The purpose of this study was to investigate how much influence teacher-student relationships and peer relationships would have on the academic engagement of students in physical education classes. For that purpose, the study found a population in middle and high school students in Gyeonggi Province and selected 371 through the convenience sampling method. Collected data were put to the multiple regression analysis with the PASW Ver 18. statistical program. The findings were as follows: First, teacher-student relationships and peer relationships had statistically significant effects on the academic engagement(commitment) of students in physical education classes. Second, teacher-student relationships and peer relationships had statistically significant effects on the academic engagement(efficacy) of students in physical education classes. Third, teacher-student relationships and peer relationships had statistically significant effects on the academic engagement(absorption) of students in physical education classes. Finally, teacher-student relationships and peer relationships had statistically significant effects on the academic engagement(vitality) of students in physical education classes.
스크린 골프 참여의도와 지속행동 예측을 위한 계획행동이론의 적용
이상섭(Lee Sang-Sub) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.1
The purpose of this study was to verify the relationship screen golf of the golfer participants based on theory of planned behavior. The data collected from the 208 experience to screen golf was analyzed. With the collected data, exploratory factor analysis, correlation analysis, confirmatory factor analysis, and structural eduation model analysis was performed by SPSSWIN 14.0 and AMOS 5.0. The result of the analysis were summarized as follows. First, the attitude of screen golf makes positive(+) influence on intention of screen golf. Second, the subjective norm of screen golf makes anything influence on intention of screen golf. Third, the perceived behavioral control of screen golf makes positive(+) influence on intention of screen golf. Fourth, the intention of screen golf makes positive(+) influence on exercise of screen golf. Last the perceived behavioral control of screen golf makes positive(+) influence on exercise of screen golf. These results were discussed based on the previous and practical studies related to theory of planned behavior screen golf behavior.