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이성숙 ( Sung Suk Lee ),이학주 ( Hak Ju Lee ) 한국목재공학회 2010 목재공학 Vol.38 No.6
This study was carried out to evaluate the antifungal and antioxidative activities of ethanol extracts from Magnoliaceae to investigate the possibility for the natural fungicides and food preservatives. The antifungal activities of ethanol extracts were evaluated as a hyphal growth inhibition rate using four plant pathogenic and five wood rot fungi. The high inhibition activity on the growth of fungi was shown in bark of Magnolia obovata that indicated more than 50% hyphal growth inhibition rate except Trametes versicolor, one of the white rot fungi. The antifungal activity was the highest in the ethanol extracts from M obovata and the following was in order of M kobus and M sieboldii. The extract from bark in M obovata showed higher antifungal activity than that from wood in the same species. Especially, the extracts from flower of M denudata and M liliflora indicated the high antifungal activities, while the other portions of same plants showed the low activities. On the other hand, a free radical scavenging method was adopted with 1,1-diphenyl-2-picrylhydrohydrazyl (DPPH) in order to test the antioxidative activities of ethanol extracts. The free radical scavenging activity was very high in the extracts from branch of Schizandra nigra and Kadsura japonica that showed more than 90% at the concentration of 100 μg/㎖. It also turned out that the antioxidative activity of branch of S nigra and K japonica was similar to α-tocopherol and butylated hydroxytoluene, one of the effective synthetic antioxidants. From these results, it can be suggested that the branches of S nigra and K japonica have the positive antioxidative activities and can be applied for the food preservatives and cosmetic ingredient.
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목초액의 항균활성 및 농약, 식품보존제로의 이용 가능성
이성숙 ( Sung Suk Lee ),안병준 ( Byoung Jun Ahn ),조성택 ( Sung Taig Cho ) 한국목재공학회 2010 목재공학 Vol.38 No.4
Antifungal and antibacterial activities of wood vinegars were investigated in this study in order to apply for the natural fungicides and food preservatives. The antifungal activities of wood vinegars were measured as a hyphal growth inhibition rate using four plant pathogenic, four wood rot and one mushroom pathogenic fungi. Inhibition effect on the fungi growth was explicitly observed at the concentrations higher than 0.5% of unrefined wood vinegar and higher than 1.0% of refined wood vinegar, respectively, suggesting that unrefined wood vinegars showed the higher antifungal activities than that of refined wood vinegars. The highest inhibition effect on the fungi growth was shown in Libertella betulina which is a mushroom pathogenic fungus. In addition, the wood vinegars from Pinus densiflora showed the higher antifungal activities against the plant pathogenic and wood rot fungi than that from Quercus spp.. On the other hand, the antibacterial activities of wood vinegars were determined by a paper disc method using the three gram positive and five gram negative bacteria. The unrefined wood vinegars showed a prominent effect on the suppression of bacteria growth at the concentration of 10%, while the suppression of bacteria growth was not observed in the refined wood vinegars. These results also suggest that the unrefined wood vinegars showed the higher antibacterial activities than the refined wood vinegars. The antibacterial activities of wood vinegars against gram positive bacteria were higher than those of wood vinegars against gram negative bacteria. From these results, it can be inferred that the wood vinegars has the strong antimicrobial activities and can be applied as the natural fungicides and food preservatives.
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아동 대상 파견 영어교사의 교수 동기와 탈동기 연구: 코로나-19 이후를 중심으로
이성숙(Lee, Sung Suk),김태영(Kim, Tae-Young) 한국초등영어교육학회 2022 초등영어교육 Vol.28 No.1
This paper investigates itinerant English teachers’ initial teaching motivation and demotivation factors for preschool children after the COVID-19 pandemic. A total of 150 English teachers responded to a questionnaire survey with a 5-point Likert scale, which had 15 items for teaching motivation and 10 for demotivation with background information. Five factors emerged regarding teaching motivation: ideal L2 self, ideal L2 teacher self, intrinsic reward, necessity of career choice, and financial reward. Among them, the ideal L2 teacher self was identified as the most influential factor in teaching motivation. In terms of demotivation factors, learners’ lethargic attitudes and negative relationships with fellow teachers proved to be the dominant demotivation factors. Among teachers’ motivating factors, financial rewards were regarded crucial as the teachers’ age increases. Given the scarcity of teacher responses whose age ranges from 20 and 30, the COVID-19 pandemic seems to have negatively affected the employment of young itinerant English teachers. This study implies that it is necessary to provide itinerant English teachers with a systematic teacher training program to build a comprehensive knowledge of early childhood education in English.
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이성숙 ( Sung-suk Lee ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1
최근의 기후변화와 코로나19로 인한 위기는 사회 전반에 걸쳐 패러다임의 전환을 요구하고 있다. 이에 정부는 지난해 ‘2050 탄소중립’을 선언하고 12월 7일 관계부처 합동 추진전략(안)을 발표하였다. 그리고 산림청은 4개의 정책 방향을 포함하는 2050 탄소중립 산림부문 추진전략을 발표하였다. 4개의 정책 방향 중 하나가 목재와 산림바이오매스 이용을 확대하는 것이다. 기후변화협약에서 탄소저장고로 인정되고 있는 목재의 수요와 공급의 선순환 체계를 확립하여 국산목재의 이용을 활성화함으로써 온실가스 배출을 저감하는 것이다. 즉, 산림의 탄소흡수 역할을 강화하기 위해서는 나무를 심고 가꾸고 수확하고 사용하는 선순환체계 확립이 필요한데 이러한 관점에서 목재이용 활성화는 반드시 필요하다. 이를 위해 국립산림과학원은 목재친화도시 조성을 위해 도시목조화를 연구하고 목구조 건축물의 확대를 위해 생산기술을 고도화하며 플라스틱을 대체하는 목재 제품을 개발하고 상용화를 추진하고 있다. 또한, 국제기구(IPCC)에서 인정한 탄소중립 연료인 산림바이오매스를 이용하여 에너지화하는 연구도 수행하고 있다. 더불어 잎이나 잔가지 등 벌채 부산물을 이용하여 향료소재로 개발하고 산업화를 추진하고 있다. 이러한 목재 이용 활성화를 위해 추진하고 있는 국립산림과학원의 연구개발 현황 및 사례를 소개하고자 한다.
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