• Journal of the Korean Wood Science and Technology
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• 제32권3호
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• pp.66-70
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• 2004

The antioxidant activities of six isoflavonoids isolated from Sophora japonica wood and bark were examined by DPPH (1,1-diphenyl-2-picrylhydrazyl) free radical scavenging method. This study was focused on the relationship between antioxidant activity of isoflavonoids and their chemical structures. From the results of this study, it could be concluded that the hydroxyl groups that linked at ring B and ring A in isoflavonoids have importance in the antioxidant activity. Additionally, the absence of the 2,3-double bond on the isoflavonoid enhances its antioxidant activity.

• 한국보육지원학회지
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• 제13권2호
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• pp.59-80
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• 2017

Objective: The purpose of the present study was to find out the development of 4-year-old children's emerging poetry composition process and features of poetic expression through their own forest experiences. This research also aims to explore the possibility of alternative poetry education for early childhood. Methods: This study collected data from one class of four-year olds through classroom observation, interviews with teachers, and the researcher's journal entries on events that occurred during forest walking activities. Results: Research findings showed that it was possible to encourage free expression of metaphors and imagination in children and they were able to share excitement about poetry with their classmates when provided with an alternative environment. One remarkable finding was that children's spontaneous writing and pleasure in poetry did not continue when given the new theme of 'Mom and Dad'. Conclusion/Implications: The results imply that to encourage the development of children's intuitive poetic words we need to be interested in how to organize and highlight the experiences of children. This study also suggests that positive methodological and teleological changes are needed for poetry education that is separate from language education.

• 한국환경생태학회지
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• 제29권2호
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• pp.279-291
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• 2015

This study analyzed the growth characteristics of multi-layer planted trees through their growth analysis and attempted to present a management strategy. The subject of research is the Citizen's Forest Area of Seoul Forest Park located in Seoul City. Field surveys were conducted three times over eight years from 2005 when the Seoul Forest Park was created through 2013. Labels were attached to all trees in the target area, and their species, height and DBH were investigated. To identify the growth differences by trees in each area, a detailed tree location map was drawn up for use in the analysis. To check soil health, soil organic matter, soil pH and soil microbial activities were analyzed. It turned out that the growth of the multi-layer planted trees in the target area of research was higher than that of the trees in existing urban parks, and that it was similar to that of trees in natural forests. Through a field survey in the area with a remarkably low growth, high-density planting problem, soil was found to have excess-moisture and there was the problem of Pueraria lobata covering. As a result of the analysis of the soil, it was found that its organic content in the soil was lower; soil pH was higher; and microbial activities in the soil were lower when compared to that of natural forests.

• Journal of the Korean Wood Science and Technology
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• 제47권4호
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• pp.498-508
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• 2019

This study was carried out to investigate the potential of Korean red pine (Pinus densiflora) inner bark extracts as an antidiabetic agent. The ethyl acetate soluble fraction of the bark extracts was chromatographed on a Sephadex LH-20 column to yield five compounds, which structures were elucidated by NMR spectroscopy. The isolated compounds were (+)-catehin, (-)-epicatechin, taxifolin, taxifolin-3'-O-${\beta}$-D-(+)-glucose and $\tilde{n}$-courmaric acid. The antidiabetic activity of the different fractions, including the crude extracts and isolated compounds, was evaluated by ${\beta}$-cells insulin secretion and glucose uptake in skeletal muscle cells. The insulin secretion was 128% for taxifolin at $25{\mu}g/mL$. However, the other samples had no effect on this test. For the glucose uptake activity assay, $1{\mu}M$ insulin and 2 mM metformin were used as controls. Both the crude extract and taxifolin showed relatively low activity values, but the other samples yielded glucose uptake values over 260%. ${\rho}$-courmaric acid showed the highest uptake (270%). The results confirmed that Korean red pine extracts may be used as a hypoglycemic agent.

• 한국산림과학회지
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• 제106권4호
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• pp.441-449
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• 2017

사유림 경영 활성화를 위해서는 산주들의 참여가 매우 중요하다. 본 연구에서는 선도산림경영단지 내 산주들의 참여를 확대할 수 있는 방안을 찾고자 하였다. 이를 위해 선도산림경영단지 내 산주들을 대상으로 심층 인터뷰를 실시하여 참여수준을 파악하고 Arnstein의 주민참여 8단계 이론을 적용하여 산주들의 참여수준을 분석하였다. 연구결과 선도산림경영단지 산주들의 참여수준은 형식적인 단계에 머물러 있으며 의사결정 과정에 미치는 영향력이 매우 제한적인 것으로 나타났다. 따라서 본 연구에서는 제도적으로 산주들이 단지 운영을 위한 의사결정과정에 참여할 수 있도록 산주협의체를 제도화하고 선도산림경영단지 산림경영 담당자와의 파트너십 체결을 제안하였다. 다만 본 연구에서는 단지 운영에 적극적인 일부 소재 산주를 대상으로 심층인터뷰를 실시함으로써 전체 선도산림경영단지 참여 산주들의 의견을 대표하는 데에는 다소 한계가 있다.

• 한국환경생태학회지
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• 제31권6호
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• pp.595-605
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• 2017

본 연구는 숲이 가지고 있는 산림치유인자들과 요인들을 활용하여 방과후 산림치유프로그램 활동이 유아의 친사회적 행동과 자아효능감에 어떠한 효과가 있는지를 알아보고자 하였다. 실험대상은 청주시 ${\bigcirc}{\bigcirc}$동에 위치한 유아교육기관으로 산림치유프로그램 활동을 실시하는 실험집단과 산림치유프로그램 활동을 하지 않고 유아교육기관에서 운영하는 프로그램에만 참여하는 비교집단 만3세~5세 유아 남녀 각각 20명으로 하였다. 실험기간은 2017년 4월 10일부터 2017년 7월10일까지 매주 1회씩 12회로 1시간(60분)씩 실시하였다. 산림치유프로그램 활동 실시 전후에 유아를 대상으로 친사회적 행동과 자아효능감 검사를 실시하고 그 자료는 SPSS 18.0 프로그램으로 분석하였다. 그 결과 긍정적인 행동을 수행할 수 있는 친사회적 행동과, 자신감을 나타내는 자아효능감은 통계적으로 유의미하게 나타났다 (p<0.05). 산림치유프로그램 활동을 실시한 유아들은, 자연과 더불어 또래들과 함께 지내며 긍정적인 생각을 하여 자신감이 향상되었다. 또한 생태지식뿐만 아니라 상대에 대한 배려와 협동심이 증가하였다. 친사회성의 하위요인인 개인정서조절능력과 대인관계형성능력, 유아교육기관 적응능력, 자아효능감의 하위요인인 신체적 효능감이 크게 향상되어 친사회적행동과 자아효능감에 긍정적인 영향을 주는 것으로 나타났다.

• 한국환경교육학회지:환경교육
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• 제18권2호
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• pp.90-100
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• 2005

This study was intended to investigate effects of building school forests on elementary school students, including changes in mental image of school, attitude toward nature and forest, and awareness of their relationship with school forest. The total number of 770 drawings and 1,124 writings were collected to be analyzed from three elementary schools. The results showed that there were significant differences between two student groups, respectively forest school group versus non-forest school group, in their mental image of school. For instance, more often observed in the drawings of forest school group students than their counterparts were natural and human elements, activities associated with nature, and natural or human elements located at central area. Also, more frequently found in the writings of forest school group students than their counterparts were letter-style sentences, stories about school forests, inherent values on nature and forest, and curiosity regarding the nature. These results seem to indicate that in order to materialize educational value of school forests, practical workshops for teachers need to be held as soon as possible and new activity models for students should be developed. In addition to that, long-term research on effectiveness of school forest have to be conducted to a number of schools.

• 한국자원식물학회지
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• 제33권6호
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• pp.551-557
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• 2020

In this study, we were performed to elucidate the antioxidant and anticancer activity by leaves extracts from Acer tegmentosum (AT-L). In DPPH, ABTS radical scavenging activity, the AT-L revealed the high scavenging activity. Especially, the AT-L measured the highest ABTS radical scavenging activity, which is higher than ascorbic acid. The types of human cancer cells for evaluating the anticancer activity were colorectal cancer (SW480), prostate cancer (PC-3), breast cancer (MCF-7), pancreatic cancer (AsPC-1), lung cancer (A549) and liver cancer (HepG2). Human cancer cell viability was measured using MTT assay. Treatment of the AT-L decreased the cell viability and induced apoptosis in SW480 cells. These results suggest that extracts of the AT-L can be used as supplementary material for developing the natural antioxidant and anticancer drug for human cancer cells.

• 한국기후변화학회지
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• 제6권4호
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• pp.257-265
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• 2015

For estimating a net removal of carbon dioxides from a forest carbon offset project, it is necessary to consider secondary emissions occurred from the use of machineries or vehicles. According to the forest carbon standard in Korea, a default rate (5%) could be applied for estimating secondary emissions of small projects, which provide annual net removals less than or equal to $600tCO_2$, while secondary emissions should be estimated for larger projects with field survey. In this study, we intended to develop a methodology for estimating the secondary emission of a forest carbon project. For this purpose, we analyzed the working process and the carbon emissions of the forest management activities for major tree species in Korea. Based on the developed methodology, we estimated the secondary carbon emission of a reforestation project. The result showed that the secondary carbon emission of a reforestation project was estimated between 0.42% and 1.19 % compared to net removals, that is to say that the current default rate in the forest carbon standard could give an overestimated secondary emission.

• 한국환경과학회지
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• 제31권1호
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• pp.51-59
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• 2022

This study investigated the effects of participation in a forest therapy program on ego-resiliency and interpersonal relationships to strengthen the independent capabilities of children requiring protection. The participants were divided into two groups: the experimental group (n=87; age, 16.40±1.90 years) and control group (n=90; age, 16.97±1.39 years). The study was conducted from July to August 2020. The experimental group participated in a forest therapy program operated by the National Center for Forest Therapy, Yeongju, for 2 nights and 3 days, whereas the control group lived routine life. The participants' ego-resiliency and interpersonal relationships were tested at the beginning and end of the forest therapy program. In the experimental group, ego-resiliency was improved and interpersonal relationships were significantly altered. Therefore, forest therapy programs may serve as effective interventions that can positively affect the social adaptation and growth of protected children into healthy adults.