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원격평생교육원 학습자 시간관리 데이터 및 개인배경 데이터를 통한 수료가능성 예측
이종연(Lee Jong-Yeon),서종택(Seo Jong Teak) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.8
본 연구의 목적은 원격평생교육원 학습관리시스템(Learning Management System: LMS)에 축적된 수강생들의 시간관리 데이터(학습시작 간격의 규칙성, 총 학습시간, 총 학습 횟수) 및 개인배경 데이터(수강경험 과목 수, 성별, 나이, 교육경력)가 수료 여부를 결정짓는 총 점수(시험, 과제 및 출결 점수의 합)에 미치는 영향에 대해 분석하고, 16주 동안 진행된 학습과정 중 총 점수를 유의하게 예측할 수 있는 가장 이른 시점이 언제인지 알아보는데 있다. 이를 통해 조기에 미수료 가능성을 파악하여 적절한 처방을 내려 수료율을 높이는데 기여하고자 한다. 이에 원격평생교육원 학습자 2,179명의 LMS 데이터를 추출하여 다중회귀분석을 진행한 결과, 시간관리 데이터 중 총 학습시간과 학습 횟수가 총 점수에 유의미한 영향을 미치는 것으로 나타났다. 즉, LMS에 빈번히 접속할수록 또한 학습시간이 많을수록 총 점수가 높아짐을 알 수 있었다. 개인배경 데이터 중에는 나이가 총 점수에 유의미한 영향을 미치는 것으로 나타났다. 즉, 나이가 많아질수록 수료할 확률이 높아진다는 결론을 얻을 수 있었다. 최종적으로 학습 진행과정을 4등분하여 각 시점까지 누적된 데이터로 총 점수를 유의하게 예측할 수 있는지 확인해본 결과, 개강 후 4주후부터 유의미한 수료가능성 예측이 가능함을 알 수 있었다. Learner-centered education, This study attempted to analyze whether the learner’s time management and personal background data obtained from the learning management system(LMS) could predict the total score that would determine the completion of a course in lifelong distance education. It also examined the earliest learning progression point that could significantly predict the likelihood of his/her course completion. Based on previous studies, the student’s regularity of connecting to the system (RCS), total learning time (TLT), the number of times he/she accesses the system (NAS), gender, age, academic experience and the number of courses completed (NCC) were selected as the time management and personal background variables influencing the total score (TS), which was the criterion of course completion. Using the data of 2,179 students who had participated in the lifelong distance educational program, multiple regression analysis was conducted to build a prediction model for the TS. This analysis was also performed on a quarterly basis to determine the earliest learning progression point to predict the students’ total scores. Accordingly, the TLT, NAS, and age were proved to influence the TS, but the RCS, gender, and NCC exhibited no such influence. Meanwhile, the prediction of course completion by learners was found to be significant from the first quarter.
멀칭재료와 GA<sub>3</sub>처리에 따른 유색칼라(Zantedeschia elliottiana cv. 'Black Magic')의 생육 및 개화반응
남춘우,유동림,김수정,서종택,백기엽,이상규,Nam, Chun-Woo,Yoo, Dong-Lim,Kim, Su-Jeong,Suh, Jong-Teak,Paek, Kee-Yoeup,Lee, Sang Gyu 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.4
This experiment had been conducted to determine optimal culture conditions for the growth and cut flowers of Calla (Zantedeschia 'Black Magic' 'Golden Affair') in highlands. Tubers of calla 'Black Magic' was treated with 0, 100, and $200mg{\cdot}L^{-1}$ concentration of $GA_3$. ABA content in tubers and roots were twice higher ($20-25pmol{\cdot}mL^{-1}$) in control than in $GA_3$ treated tubers and roots. ABA contents in tubers was not consistent but ABA contents in roots increased with increasing $GA_3$ concentration. However ABA is in inverse proportion to GA. It was mean that GA of high contents was ABA of low contents. Calla 'Golden Affair' was treated with different mulching materials (Control, black PE, Reflective film, Rice hull) and $GA_3$ concentrations (0, 50, 100 and $200mg{\cdot}L^{-1}$). It was largest in the length of flower at mulching of reflective film, Rice hull and it was greatest in the number of cut flowers at the treated with $200mg{\cdot}L^{-1}$ $GA_3$, Therefore the proper condition was at $200mg{\cdot}L^{-1}$ $GA_3$ with reflective film mulching.
멀칭재료와 GA3처리에 따른 유색칼라(Zantedeschia elliottiana cv. ‘Black Magic’)의 생육 및 개화반응
남춘우(Chun-Woo Nam),유동림(Dong-Lim Yoo),김수정(Su-Jeong Kim),서종택(Jong-Teak Suh),백기엽(Kee-Yoeup Paek),이상규(Sang Gyu Lee) 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.4
This experiment had been conducted to determine optimal culture conditions for the growth and cut flowers of Calla (Zantedeschia ‘Black Magic’ ‘Golden Affair’) in highlands. Tubers of calla ‘Black Magic’ was treated with 0, 100, and 200 mg?L-1 concentration of GA3. ABA content in tubers and roots were twice higher (20-25 pmol?mL-1) in control than in GA3 treated tubers and roots. ABA contents in tubers was not consistent but ABA contents in roots increased with increasing GA3 concentration. However ABA is in inverse proportion to GA. It was mean that GA of high contents was ABA of low contents. Calla ‘Golden Affair’ was treated with different mulching materials (Control, black PE, Reflective film, Rice hull) and GA3 concentrations (0, 50, 100 and 200 mg?L-1). It was largest in the length of flower at mulching of reflective film, Rice hull and it was greatest in the number of cut flowers at the treated with 200 mg?L-1 GA3, Therefore the proper condition was at 200 mg?L-1 GA3 with reflective film mulching.
고랭지에서의 근권환경에 따른 유색칼라(Zantedeschia)의 생육반응
남춘우(Chun-Woo Nam),유동림(Dong-Lim Yoo),김수정(Su-Jeong Kim),서종택(Jong-Teak, Suh),백기엽(Kee-Yoeup Paek),이상규(Sang Gyu Lee),윤무경(Moo Kyung Yoon) 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.4
This experiment has been carried out to determine optimal culture conditions for the production of cut flowers and tubers of Calla (Zantedeschia ‘Golden Affair’ and ‘Black Magic’) in highlands. Treatments consisted of various levels of root zone environments, Results are as follows: Calla ‘Golden Affair’ were grown with different mulching materials such as Non-mulching, Black film, reflective film, Rice hull. Mulching materials resulted in no difference in the number of cut flowers but flower length was highest in reflective film. Calla ‘Black Magic’ were treated with various soil water content, soil type and watering time. Number of cut flowers and flower quality were greatest when the plants were watered at -80 ㎪ soil water content. No symptoms of soft rot (Erwinia carotovora) was observed at this soil water content. The occurrence of soft rot was observed with similar percentage according to soil type and the soil water content. When Calla ‘Black Magic’ were watered at the time of soil surface drying, growth was greater compared to others. Air temperature and PPF affected plant growth and photosynthesis. Photosynthetic rate was greatest at 25℃ and PPF 200 μ㏖·m<SUP>-2</SUP>·s<SUP>-1</SUP>, while lowest at 28℃ and PPF 800 μ㏖·m<SUP>-2</SUP>·s<SUP>-1</SUP>. Soft rot did not occur without regard to dipping treatment (0, 5, 10, 24, 48 hours) when the day and night temperature were maintained at 25℃ and 20℃, respectively.
수확시기와 야간온도가 유색칼라(Zantedeschia)의 구근생산에 미치는 영향
남춘우(Chun-Woo Nam),유동림(Dong-Lim Yoo),김수정(Su-Jeong Kim),서종택(Jong-Teak, Suh),백기엽(Kee-Yoeup Paek),이상규(Sang Gyu Lee),윤무경(Moo Kyung Yoon) 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.4
This experiment was carried out to determine optimal culture conditions for the production of tubers of Calla (Zantedeschia elliottiana ‘Golden Affair’ and ‘Black Magic’) in Korea highland. In vitro produced plantlets and tuberlets of Calla ‘Golden Affair’ and ‘Black Magic’ were planted plastic film greenhouse and grown for 100, 120, 140 days, with different night temperature treatments (0~10℃ : no heating, 10, 15℃). In both cultivars, tuber size(tuber diameter, tuber height) and tuber weight increased with increasing cultivation period when the night temperature was maintained at 10℃. The largest tuber diameter in vitro produced plantlets was 5.8cm in ‘Black Magic’ and 3.2cm in ‘Golden Affair’, and daily tuber growth rate was 1.110g in ‘Black Magic’ and 0.092g in ‘Golden Affair’ under the culture conditions. Consequently we think that tuber harvest date was Oct. 30 and night temperature was 10℃ and no heating that was proper method of tuber production. However we had selection of 10℃ treatment for tuber production because it appeared freezing damage occasionally in highland late in October.