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의미분별법에 의한 중·고등학생의 기술교과에 대한 이미지
류영현,최유현 한국실과교육연구학회 2005 實科敎育硏究 Vol.11 No.2
The purpose of this study was to analyze the middle and high school students' images on Technology education through Semantic Differential(SD). It surveyed a population of 7th to 10th year students in Korea, who learn Technology - Home Economics subject according to the 7th National Curriculum. It sampled 1600 students among them, in four predetermined provinces of Seoul․Gyeonggi-do, Chungcheong-do, Honam and Yeongnam Provinces. I used 1197 questionnaires returned, in analysing the result, and also examined frequency, average, standard deviation, percentage, t-test, One-way ANOVA and post-hoc tests, among which I observed Scheffe or Dunnett T3, to understand the nature of respondents and their images on Technology subject. The result of the study was as follows; A. The average image of whole groups toward Technology subject was 4.16(out of 7), narrowly exceeding the mid-point, 4. Middle and high school students recognized the subject as correct, honest, masculine, trustworthy and valuable and, at the same time, as rigid, difficult, unfamiliar and cold. B. The average image toward Technology subject by each gender was significantly different, with its level of significance of p<.01. Male students had a higher score of image than female students. C. The average image toward Technology subject by each grade was significantly different, with its level of significance of p<.05. The group of 2nd year middle school students had higher score of image than that of 1st year middle school students. D. The average image toward Technology subject by each region was significantly different, with its level of significance of p<.01. The students in Yeongnam Province had lower score of image than those in Seoul․Gyeonggi-do, Chungcheong-do and Honam Provinces, and the students in Honam Province had higher score of image than those in Seoul․Gyeonggi-do, Chungcheong-do and Yeongnam Provinces. E. The average image toward Technology subject by each size of the city was significantly different, with its level of significance of p<.01. Students in middle and small sized cities had higher score of image than those in metropolitan area. Therefore, further researches on the cause should take place in the future, in order to obtain information for the improvement of students' images. B. Since girl students had remarkably low images on the subject, much concern and efforts are needed to improve their image on the subject.
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포도갈색무늬병 발병수준이 ‘켐벨얼리’ 유기포도의 광합성률에 미치는 영향
류영현,배수곤,연일권,김광섭,박상조,박준홍,박종호 한국유기농업학회 2016 韓國有機農業學會誌 Vol.24 No.4
Grape cultivar “Campbell Early” account for 70% of table grape in Korea and Leaf Spot Disease caused by Pseudocercospora vitis is one of a major disease in greenhouse and field grown area during late summer season in both of organic and conventional grape farm. Leaf spot disease can cause lowing of sugar content in fruit and vine growth and very difficult to control especially in organic field. Photosynthesis ability and chemical components are compared between leaf spot disease infected leaves with degree of necrotic area. With increase of disease necrotic area, CO2 differential value, water use efficiency and CO2 assimilation and respiration ratio are decreased proportionally and on the other hand, stomatal conductance value is not affected by disease necrotic area. Chlorophyll contents are also decreased by 50% in heavily infected leaves and imply decrease of chlorophyll contents is a major source of photosynthesis ability decline. With increase of disease necrotic area in leaves, total nitrogen and phosphate contents are decreased and on the other side, total carbon, potassium, calcium and magnesium contents are increased. From this research, we can infer that not only chemical control program is important in control of leaf spot disease but also fertilizing program is significant especially in organic agronomical control of fungal disease in grape cultivar “Campbell Early”.
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Alendronate-Polyurethane Films for Guided Bone Regeneration
류영현,최강호,오도현,최성욱 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We synthesized biodegradable and hydrophilic polyurethane (PU) dispersion by a prepolymer method. Dimethylol propionic acid, which served as the polyol, provides carboxyl groups in PU and improves the hydrophilicity of the PU film. The carboxyl groups of the PU were utilized for the conjugation with alendronate (Alen) and the ionic cross-linking among PU polymers. Alen conjugation and ionic cross-linking both significantly reduced the water contact angle. The Alen-conjugated PU (Alen-PU) film showed a ductile property with high elongation at break. The ionic cross-linking of Alen-PU film resulted in the improvement of Young"s moduli and tensile strength. In addition, the biodegradation time of the PU-based films was increased due to the ionic cross-linking. The effect of Alen in PU film reduced proliferation and enhanced differentiation of pre-osteoblasts. We believed that the Alen-PU films have wide application potential in tissue engineering, especially for guided bone regeneration.
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류영현,이중환,권태영,김승한,김동근 한국식물병리학회 2010 식물병연구 Vol.16 No.2
자두 주산지인 경북 김천을 비롯하여 의성, 경산, 군위지역에 발생하는 자두과실의 검은점무늬병 병원균을 조기 검출하기 위하여 integrons를 이용한 primer를 제작하고 DNA 추출향상을 위해 전배양법을 그리고 검출감도 향상을 위해 nested PCR을 시도하였다. 제작된 integrons primer로 병반 시료를 PCR한 결과 예상되는 크기인 760 bp로 증폭이 되어 검은점무늬병의 원인 병원균은 Xanthomonas arboricola pv. pruni로 확인되었고 진단용 primer로 사용될 수 있음을 확인할 수 있었다. DNA 추출 방법별로 PCR 진단효율은 조사한 결과 직접 추출하는 방법보다는 10% LB배지로 전배양한 다음 DNA를 추출하는 방법이 더 효과적이었고 nested PCR을 이용할 경우에는 과원내 강우중의 X. arboricola pv. pruni의 검출도 가능하였다. 이번에 개발된 Integrons primer를 이용, 전배양법과 nested PCR을 실시할 경우 1일 이내에 병징이 나타나지 않은 유묘에서의 X. arboricola pv. pruni 감염여부나 식물검역에서의 X. arboricola pv. pruni 감염식물 진단 등에도 활용이 가능할 것으로 생각된다. Bacterial black spot disease of prune fruit (Prunus salicina cv. formosa) has outbroke around major prune production area, Gimcheon, Euiseong and Gunwi in Gyungbuk province and has caused severe economic loss. Integrons PCR primer was designed along with sample pre-incubation and nested PCR method to enhance detection sensitivity for early detection of bacteria in fields. Designed integrons PCR primer successfully detected Xanthomonas arboricola pv. pruni from field collected samples, fruit, leaf, branch and even in raindrop collected from prune orchard. Pre-incubation along with nested PCR enhanced sensitivity to detect X. arboricola pv. pruni from seemingly healthy looking, symptomless branches. Designed integrons PCR can be used in prune nursery fields and in plant quarantine practice for the detection of X. arboricola pv.pruni.
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류영현,허창석,김동근,연일권,조우식,류정아 한국유기농업학회 2015 韓國有機農業學會誌 Vol.23 No.2
This experiment was conducted to test the efficiency of environmentally friendly materials for controlling garlic leaf blight by Stemphylium botryosum. Fifty five kinds of environmental friendly control agents are obtained from commercial market and are tested for spore germination using 96 well plate and among them, five agents (copper-, sulfur-, medinal herb extract-, sulfur+sodium bicarbonate- and oligo chitosan based compound) are selected for field test from 2012 and 2013 year. With reference of 2012 year test result, copper and oligo chitosan based compounds are chosen as 2013 year test. When the first symptoms were appeared early May season and environmental friendly control agents are applied as prompt as possible, the control value of copper and oligo chitosan based agents are 54% and 90% respectively as compared to the occasion of chemical agent Antracol WP (propineb 70%) and yield of bulbs are increased by 16% and 34% against untreated control and marketable garlic bulb yield were 79% and 95% against Antracol WP treatment, respectively. From this result, oligo chitosan based compound can be a good organic control agent candidate for garlic leaf blight disease in organic garlic cultivation
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