아동의 자기주도학습 특성에 관한 연구

현정숙 東亞大學校 學生生活硏究所 1999 學生硏究 Vol.27 No.-

The purpose of this study was to know about personality characteristics of self-directed learning in children. Subjects in this study were 202 teachers who worked at Chinju, Sacheon City and so on. The scale was based factor of self-directed learning characteristics upon Guglielmino's SDLRS (Self-Directed Learning Readiness Scale). Self-directed learning sub-factors in children's included in scale were labeled ; openness to new learning opportunities, self-concept as an effective learner, initiative and independence in learning, informed acceptance responsibility for one's own learning, love of learning, creativity, ability to use basic study skills and problem-solving skills. The following conclusion were that self-directed learning sub-factors in children were constructed openness, self-concept, autonomous, self-assessment, internal-motivation and ability to problem-solving.

Cohesive Features among CSAT English Question Groups Focusing on Pronouns

정숙현 담화·인지언어학회 2020 담화와 인지 Vol.27 No.4

This study investigated the textual features of CSAT English question groups in view of the semantic-pragmatic aspect. The corpus was composed of 243 passages which were culled out of the English reading section of CSAT from 2020 to 2011. The results indicated that there exist distinctive features between inference questions and indirect writing questions. The text of the inference question group maintained more interactional features with exophoric references. This produced a contextual circle between a writer and readers. The factor resulted in the highest value of narrativity in three groups. The indirect writing question group, on the other hand, employed anaphoric references, which contributed to consisting of text-internal cohesion. In specific, argument overlaps created the textual integration, which led to topic consistency through the hierarchy of pronouns.

전과정평가(LCA)에 의한 복합소재 선체구조 적층판 경량화의 환경영향 비교평가

정숙현(S. H. Jeong),정기석(K. S. Jung),이동건(D. K. Lee),오대균(D. K. Oh) 한국정밀공학회 2018 한국정밀공학회 학술발표대회 논문집 Vol.2018 No.5월

엽차용 녹차 추출물 및 분획물의 항균효과

정숙현(Sook Hyun Chung),윤교희(Kyo Hie Yoon) 한국식품영양과학회 2008 한국식품영양과학회지 Vol.37 No.11

9월에 수확하여 엽차용 녹차로 시판되는 보성산 녹차를 상온수, 80℃ 열수, 70% ethanol 용액으로 추출하고, 70% ethanol 추출물을 다시 hexane, chloroform, ethyl acetate, butanol로 분획한 다음 녹차 추출물과 분획물의 그램 양성균과 그램 음성균 8종에 대한 항균활성에 대하여 조사를 하였다. 녹차의 추출 수율은 70% ethanol 추출물은 33.0%, ethyl acetate 분획물은 11.2%를 보였다. 8종의 세균에 대한 녹차추출물 간의 항균활성은 70% 에탄올 추출물의 경우 수 추출물에 비하여 Vibrio parahaemolyticus(V. parahaemolyticu) 및 Staphylococcus aureus(S. aureus)에 대하여 가장 높았다. 70% 에탄올 추출물로부터 여러 가지 용매를 달리하여 분획한 분획물 간의 항균활성은 70% ethanol 추출물에 비하여 ethyl acetate 분획물의 경우 Klebsiella pneumoniae, V. parahaemolyticus, S. aureus, Bacillus subtilis(B. subtilis) 및 Streptococcus mutans(S. mutans)와 같은 5종의 세균에 대하여 높았다. 70% ethanol 추출물 유래 ethyl acetate 분획물의 MIC는 B. subtilis의 경우 5 μL/disc이었고, S. aureus와 S. mutans의 경우 3 μL/disc이었으며, V. parahaemolyticus의 경우 3 μL/disc 이하로 아주 낮았다. Ethyl acetate 분획물의 첨가 농도에 따른 항균효과는 B. subtilis와 S. mutans 두 균종에서 확연히 나타났고 B. subtilis는 0.05% 이상의 첨가로 24시간 증식시켰을 때 control에 비하여 균증식이 90% 이상 억제됨을 보였으며, S. mutans는 동일한 균증식 억제 효과를 얻기 위하여 0.1% 이상의 ethyl acetate 분획물 농도가 요구되었다. Ethyl acetate 분획물의 열처리(121oC, 20분)는 균종에 따라 10%정도의 항균활성을 감소시켰다. 이와 같은 결과를 종합할 때 9월에 채엽된 저렴한 녹차로 천연항균제 혹은 식품보존료의 개발은 충분한 잠재력이 있는 것으로 판단되었다. Antimicrobial activities of green tea extracts used for coarse tea were investigated by disc diffusion method using eight different bacteria. Among the green tea extracts, the 70% ethanol extract demonstrated the strongest antimicrobial activities against Vibrio parahemolyticus (V. parahemolyticus) and Staphylococcus aureus (S. aureus) and thus was further fractionated. Among these fractions, the ethyl acetate fraction showed the strongest antimicrobial activities against V. parahemolyticus, S. aureus, Bacillus subtilis (B. subtilis), and Streptococcus mutans (S. mutans). These activities exceeded that of all extracts and fractions tested in this study. Interestingly, although green tea extracts showed significant antimicrobial activity against Micrococcus luteus (M. luteus), once fractionated, the ethyl acetate fraction did not show any antimicrobial activity against M. luteus. MICs of the ethyl acetate fraction were 5 μL/disc against B. subtilis and 3 μL/disc against S. aureus, S. mutans and V. parahaemolyticus. 90% inhibition of B. subtilis was observed with 0.05% ethyl acetate fraction but S. mutans needed over 0.1% ethyl acetate fraction to exhibit the same inhibition as B. subtilis. Antimicrobial activities of ethyl acetate fractions were reduced around 10% by thermal treatment at 121℃ for 20 min. All the results suggest that the 70% ethanol extract as well as the ethyl acetate fraction from green tea used for coarse tea could be further developed into a natural antimicrobial agent.

거제도산 맹종죽(Phyllostachys edulis)추출물의 항균활성

정숙현 東西大學校 2000 동서논문집 Vol.6 No.-

The antibacterial activity of bamboo(Phyllostachys edulis : from Gueje island) extracts is investigated on 10 bacteria. The extracts are prepared using acetone, ethyl acetate, ethyl ether and methanol with roots, leaves and culms of bamboo. The cults extract showed the most effective antibacterial activity and the others are in the order of leaf and root extracts by hole-test. For the effect of extraction solvent on antibacterial activity, methanol is the most efficient to inhibit bacteria and the others result on in the order of acetone, ethyl ether and ethyl acetate in culms, ethyl ether, ethyl acetate and acetone in leaves. Among the bacteria V.parahaemoylticus is inhibited strongly by bamboo extracts and M.luteus, S.aureus, B.subtilis and K.pneumonia are also inhibited. MICs of M.luteus, K.pneumonia, and V.parahaemoylticus with methanol extract of cults are mesured 0.6%, 0.9%, and 1.2% (converted by fresh culm W/V) respectively. Lethal effect of methanol extract of 15g culm is observed incubating 100m1 media with 2 × 105 cfu/ml of M.luteus at 35℃. Decimal lethal time is calculation 78min. Key words : Bamboo extracts, Antimicrobial activity, MIC

포도주품질의 근원은 무엇인가? : 프랑스 포도주를 중심으로

정숙현 한국지역사회연구소 1993 地域社會 Vol.1993 No.2

감잎차의 ethanol 추출물 및 분획물의 항균효과

정숙현(Sook Hyun Chung) 한국차학회 2009 한국차학회지 Vol.15 No.2

8월에 채취하여 건조(60℃)시킨 감잎차를 70% ethanol로 추출하고, 이 추출물을 다시 hexane, chloroform, ethyl acetate 및 butanol로 분획하여 제조된 감잎 추출물과 분획물의 항균활성을 7종의 세균과 2종의 효모에 대하여 조사하였다. 감잎의 추출 수율은 70% ethanol 추출물은 14.0%, 분획물 중에서는 chloroform 분획물이 2.5%로서 가장 높았다. 항균활성은 70% ethanol 추출물의 경우는 약하지만 7종의 세균 모두에서 항균활성이 있었고, 특히 V. parahaemolyticus와 S. aureus에 대하여 가장 강하였고, B. subtilis에도 상당한 항균활성을 나타내었다. 분획물에서의 항균활성은 hexane 분획물에서는 전혀 없었고, 그 외 분획물들은 공통적으로 그램 양성 세균에 대하여 활성이 있었다. 특히 ethyl acetate 분획물은 B. subtilis, S. aureus, 및 V. parahaemolyticus에 대하여 매우 높은 항균활성을 보였고 M. luteus에 대하여는 미약하였다. 특히 효모에 대하여는 모든 추출물 및 분획물들이 항균활성이 전혀 없었다. Ethyl acetate 분획물의 MIC는 V. parahaemolyticus 는 0.3%로서 가장 낮았고 B. Subtilus는 0.5%, S. aureus는 2%이었다. Ethyl acetate 분획물의 첨가 농도에 따른 B.subtilis의 증식억제효과는 1.0%의 첨가로 24시간 증식시켰을 때 control에 비하여 약 90%의 균증 식이 억제 되었다. Ethyl acetate 분획물의 열처리(121oC, 20분)효과는 균종에 따라 차이가 있어 B.subtilis에 대하여서는 88.7%, V. parahaemolyticus에 대하여서는 73.8%의 열안전성을 나타내었다. Antimicrobial activities of extracts from persimmon leaf (Diospyros kaki Thunb.) were investigated by disc diffusion method using seven different bacteria and two different yeasts. The 70% ethanol extract demonstrated significant antimicrobial activities against Vibrio parahemolyticus, Staphylococcus aureus and Bacillus subtilis and thus was further fractionated. Among these fractions, the ethyl acetate fraction showed strong antimicrobial activities against V. parahemolyticus, B. subtilis and S. aureus. These activities exceeded that of all extracts and fractions tested in this study. Hexane fraction did not showed any antimicrobial activities. All of extracts did not have antimicrobial activities against two yeasts. Minimum inhibitory concentrations of the ethyl acetate fraction were 0.3% against V. parahaemolyticus, 0.5% against B. subtilis and 2% against S. aureus. About 90% inhibition of growth was observed with 1.0% ethyl acetate fraction but 0.1% ethyl acetate fraction made only eight hours delay of lag phase on the growth curve of B. subtilis. Antimicrobial activity of ethyl acetate fraction was reduced to about 74% against V. parahaemolyticus but 89% against B. subtilis by thermal treatment at 121oC for 20 min.

「DER TOD IN VENEDIG」의 象徵的 意義

정숙현 이화여자대학교 독어독문학회 1971 Echo Vol.- No.1

한국인 영어 학습자와 원어민 학위 논문에 나타난 유보어와 강조어 코퍼스 비교 분석

정숙현(Jung, Sook Hyun) 담화·인지언어학회 2018 담화와 인지 Vol.25 No.3

The purpose of this study is to investigate the overall frequency in which Korean EFL advanced learners (L2) employ metadiscourse compared to English native speakers (L1). The study utilized Hyland and Tse’s (2004) categorization of interactional metadiscourse as an operational model. It highly focused on the internal relation between metadiscourse and discourse. As the use of hedges and boosters derives from a writer’s attitude on the proposition, the study examined 20 Ph.D. dissertations in English and analyzed the way in which L1 and L2 writers used hedges and boosters. The quantitative analysis suggested that both L1 and L2 writers used more hedges than boosters. Korean students employed especially more hedges than English native speakers did, which makes assertion sound less strong. The qualitative analysis indicated that L1 and L2 writers exhibited the preference for different vocabulary choices. It demonstrated that Korean EFL students were not proficient in using various verbs. They considerably used the verb ‘show’ nearly 40% of the total usage of verbs, not adopting stative verbs frequently.

은으로 치환된 굴패각을 이용하여 제조된 항균제(Ag-Oy)의 항균효과

정숙현,신춘환 東西大學校 1998 동서논문집 Vol.4 No.-

은 치환된 굴 패각을 이용한 항균제의 항균효과를 조사하기 위하여 11종의 세균과 2종의 효모로 실험을 하였다. MIC 결과는 S. aureus 200ppm, V. parahaemolyticus 300ppm, P. vulgaris, S.faecalis, M. luteus 700ppm, E. aerogenes, K.pneumonia, P. aeruginosa 800ppm, S. typhimurium, E. codi, B. subtilis는 900ppm으로 나왔다. 그리고 S. cerecisiae와 C. albicans는 Ag-Oy에 아주 저항력이 높아 각각 1500, 3000ppm으로 나타났다. 1500ppm의 Ag-Oy로 실험한 살균효과는 아주 다양한 결과를 보였다. V. parahaemolyticus는 20분만에 완전히 멸륜되었고, S.aureus도 초기균수의 99.9%가 20분만에 사멸되었다. 그외 99.9%의 사멸에 소요된 시간으로 P.vulgaris, E. aerogenes, E. coli는 40분, M. luteus는 60분, B. subtilis, K.pneumonia는 150분의결과를 보였다. 1시간동안 배양하면서 사멸곡선의 사멸속도는 P.vulgaris, E.aerogenes, E.coli는 각각 0.086, 0.094, 0.094 log no. cell/min.로서 유사하게 나타나고, B.subtilis, K.pneumonia는 각각 0.013, 0.016 log no. cell/min로서 유사한 경향을 보이고 있다. To investigate antimicrobial effect of silver exchanged oyster shell(Ag-Oy), 11 bacteria and 2 yeasts are tested. The MIC results are 200ppm for S.aureus, 300ppm for V.parahaemolyticus, 700ppm for P. vulgaris, M. luteus and S. typhimurium, E. coli, and B. subtilis. S. cerevisiae, C. albicans are very risistant against Ag-Oy resulting 3300ppm and 1500ppm respectively. The sterilization effects of 1500ppm Ag-Oy are very diverse V. parahaemolyticus is completely sterilized in 20 min. and S. aureus results in 99.9% death and M. luteus needs 60 min. 99.9% death of B. subtilis. Death rate during 1 hour incubation with 1500ppm Ag-Oy, P. vulgaris, E. aerogenes and E.coli are very similar resulting 0.091, 0.094, 0.086 log no. cell/min. and also B. subtilis and K. pneumonia are similar rusulting 0.016, 0.013 log no. cell/min.