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원예활동을 이용한 영어수업이 초등학생의 영어학습 흥미와 자신감에 미치는 영향
윤은선 ( Yun En Sun ),박천호 ( Pak Chun Ho ),김종윤 ( Kim Jong Yoon ) 한국화예디자인학회 2017 한국화예디자인학 연구 Vol.36 No.-
A horticultural activity is a proper theme for children, since it can develop five senses of the children with a hands-on experience. Current study was conducted to investigate whether the horticultural activity could improve the English learning interest and confidence by using related English expressions in English class through the horticultural activity. Student subjects were from two classes (19 students per class) of the 6th grade in an elementary school located in Goyang city, Gyeonggi-do, Korea. Students in the control class took conventional textbook classes and students in the experimental class took English classes through horticultural activities once a week for 12 times. Students in the English class with horticultural activities had higher scores both on interest and confidence than the students in the conventional English class. In case of academic achievement, there was no significant difference in average scores between the two groups. As results of comparing the two groups 30 days after the end of the experiment, the students in the English class with horticultural activities had significantly higher English learning interest than the students in control class, which suggests maintaining the more learning interest after the class with the horticultural activities. There were positive correlation between English learning interest and confidence(r=0.037, p=0.039), and also between the English learning confidence and academic achievement (r=0.586, p<0.001). Depending on the results, this study could suppose that English learning interest and confidence could be improved in learning processes through the horticultural activities, further possibly improving the academic achievement. Therefore, in order to provide the more effective and significant educational environment to elementary students who have classes with difficult foreign languages, this study suggests that the horticultural activities could be developed for English education of elementary school and they would be effective in educational fields.
LC/MS를 이용한 축산물 중 잔류 마크로라이드계 항생물질 분석법 연구
황래홍 ( Lae Hwong Hwang ),윤은선 ( En Sun Yun ),김연주 ( Yoen Joo Kim ),김동언 ( Dong Eon Kim ),양윤모 ( Yoon Mo Yang ),이정학 ( Jung Hark Lee ),이병동 ( Byung Dong Lee ) 한국동물위생학회 2002 한국동물위생학회지 (KOJVS) Vol.25 No.3
This study was carried out to confirm analytical method of residual macrolides in livestock products by LC/MS. 1. Macrolides were analyzed by LC/MS on XTerra C18 column with 0.1%TFA(trifluoroacetic acid)-methanol in a gradient mode as mobile phase, and that were identified by positive chemical ionization with selective ion monitoring at 50~1000 mass range. 2. Residual macrolides were extracted from tissue with acetonitrile, and the extract is purified with a Sep-pak C18 cartridge, and elute macrolides with 0.1M methanolic ammonium acetate. 3. The procedure confirms the presence of each macrolide at 50㎍/kg in spiked sample.
테트라싸이클린계 잔류항생물질 분석을 위한 전처리방법 비교
김동언 ( Dong Eon Kim ),황래홍 ( Lae Hwong Hwang ),윤은선 ( En Sun Yun ),함희진 ( Hee Jin Ham ),양윤모 ( Yoon Mo Yang ),김창기 ( Chang Gi Kim ),기노준 ( No Jun Ki ),이정학 ( Jung Hark Lee ) 한국동물위생학회 2003 한국동물위생학회지 (KOJVS) Vol.26 No.3
Solid phase extraction(SPE) and matrix solid phase dispersion(MSPD) have been studied as preparation procedures for tetracyclines analysis by high-performance liquid chromatography (HPLC) in meat. The recovery range was 74~98% for SPE, and 72~93% for MSPD at spiked levels of l00ng/g for oxytetracycline(OTC), tetracycine(TC), chlortetracycline(CTC), and doxycycline(DC). The detection limits were 15~78ng/g for SPE and 25~84ng/g for MSPD, respectively. Analytical method was HPLC with UV detector. The purpose of this study was developing a practical, accurate and precise method for rapid extraction and quantitation of tetracycline residues in meat.
고속액체크로마토그라피를 이용한 우유 중 노보비오신 분석에 관한 연구
김현정 ( Hyun Jeong Kim ),황래홍 ( Lae Hwong Hwang ),정지헌 ( Ji Heon Joeng ),윤은선 ( En Sun Yoon ),박노운 ( Noh Woon Park ),한인규 ( In Gyou Han ) 한국동물위생학회 1998 한국동물위생학회지 (KOJVS) Vol.21 No.3
A method for the determination of noboviocin in milk was presented by high performance liquid chromatography(HPLC). The novobiocin in the spiked sample was extracted with methanol and evaporated under vacuum. After evaporating, the residue was mixed with distilled water for 2ml, filtrates with 0.45um acrodisc was injected into HPLC. The results obtained were as follows; 1. The calibration curve of novobiocin was showed constantly linear(r 0.999) in the range of 100~500ng/ml. 2. The mean recovery rate of novobiocin from the spiked milk sample were 88~98%. 3. The coefficients of variation were 2.6~5.8%. 4. The lowest detectable limit of novobiocin was 25ppb.