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자연과학 > 자연과학일반 (4,665건)

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THE DOUBLE FUZZY ELZAKI TRANSFORM FOR SOLVING FUZZY PARTIAL DIFFERENTIAL EQUATIONS
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제2호 / 2022 / 177-196 (20 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
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A NOTE ON FUNCTIONAL INEQUALITY AND ADDITIVE MAPPING
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제2호 / 2022 / 149-159 (11 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
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SPACES OF BMO TYPE
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제2호 / 2022 / 161-170 (10 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
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ON SOFT ROUGH PRE OPEN SETS IN SOFT ROUGH TOPOLOGICAL SPACES
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제2호 / 2022 / 103-113 (11 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
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ON ORTHOGONAL REVERSE DERIVATIONS OF SEMIPRIME Γ-SEMIRINGS
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제2호 / 2022 / 115-124 (10 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
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BLOW-UP PHENOMENA OF ARBITRARY POSITIVE INITIAL ENERGY SOLUTIONS FOR A VISCOELASTIC WAVE EQUATION WITH NONLINEAR DAMPING AND SOURCE TERMS
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제2호 / 2022 / 137-147 (11 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
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ON GENERALIZED SYMMETRIC BI-f-DERIVATIONS OF LATTICES
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제2호 / 2022 / 125-136 (12 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
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A NOTE ON TOPOLOGICAL PROPERTIES IN MULTI-VALUED DYNAMICAL SYSTEMS
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제2호 / 2022 / 171-176 (6 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
The Reclamation of an Industrial Site and Design Impacts on Environmental, Social, and Economic Resilience
The Reclamation of an Industrial Site and Design Impacts on Environmental, Social, and Economic Resilience
Brooke Shevela;Jun-Hyun Kim;Wonmin Sohn;Noah Durst
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 123-132 (10 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
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Background and objective: The industrial crisis in Michigan, USA calls for the redevelopment of abandoned industrial sites into functioning public spaces. Neglected spaces have negative impacts on the surrounding communities, promoting aesthetic, safety, economic, and environmental issues. The purpose of this study was to explore and discuss the possible redevelopment of an underused site, with particular focus on its industrial site elements; quantitative measures were then applied to determine redevelopment s effects on the nearby community. Methods: The Michigan Central Station in Detroit, Michigan, USA was selected as a case study. Landscape performance research methods were applied to quantitatively analyze the environmental, social, and economic benefits of reclaiming this abandoned industrial site and its various elements. Results: The findings show that implementing the case study redesign would result in positive environmental impacts. These impacts include expanded areas of ecologically valuable land, a reduction in sulfur dioxide, and increases in carbon sequestration, retained stormwater, and the use of recycled contents. The case study redevelopment project would impact the surrounding economic context through savings on water treatment costs obtained from the use of retained stormwater, increased property values, and job creation. Furthermore, the redesign would also impact social aspects by increasing the available gathering spaces and public open areas and enhancing safety by adding sidewalks and bike lanes. Conclusion: The findings of this study will help designers and planners recognize the value of reusing existing industrial sites instead of undertaking harmful demolition processes, eventually leading to more sustainable community designs.
Decision Tree Model for Educational Services Predicting Children s Academic Performance by Income Group
Decision Tree Model for Educational Services Predicting Children s Academic Performance by Income Group
Hae Seon Park;Hye Kyung Lim;Hyun Ok Kim
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 153-165 (13 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
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Background and objective: This study used the decision tree analysis among data mining techniques to determine whether children s academic performance can be classified and predicted by income group based on factors of educational services. Methods: For empirical analysis, data from the 10th Panel Study on Korean Children collected in 2017 was utilized. A F test was conducted to analyze the differences in variables by income group, and a decision tree analysis was conducted on the cost and time of private education services utilized by children to predict their academic performance by income group. Results: First, as a result of analyzing the research variables by income group, there was a significant difference in institute time, community center time, institute cost, lesson cost, after-school cost, and culture center cost. Second, as a result of the decision tree analysis that predicts children s academic performance by income group, it was found that for children in the low-income group, institute cost, institute time, visiting cost, and after-school time were important variables that predict their academic performance. For children in the middle-income group, institute cost, after-school time, and after-school cost were important variables for predicting academic performance. For children in the high-income group, the important variables were institute time, institute cost, after-school time, and after-school cost. Conclusion: There was no significant difference in children s academic performance in the earlier grades of elementary school, but there was a significant difference in the private education service they utilized, which may affect future income gaps as well as education gaps. This suggested the need to diversify and improve the quality of public education services as a countermeasure for the fact that parental income will cause an academic gap among children through private education.
Influences of Rural Heritage on Resident Participation in Community Activities: A Case Study of the Villages of Jeoji-ri and Handong-ri on Jeju Island, South Korea
Influences of Rural Heritage on Resident Participation in Community Activities: A Case Study of the Villages of Jeoji-ri and Handong-ri on Jeju Island, South Korea
Minki Sung
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 177-194 (18 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
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Background and objective: Recent research on cultural heritage has highlighted resident participation as an ideal method of managing local cultural heritages. However, many studies have raised questions about the practicality of this approach. This research undertook case studies of Jeoji-ri and Handong-ri on Jeju Island, South Korea focusing on how resident participation increases based on the related stakeholders, local heritages (natural, tangible and intangible cultural heritages) and social capital (trust and networking). Methods: Sixty-one completed questionnaires were collected from adult residents of both villages (28 from Jeoji-ri and 33 from Handong-ri), and the resulting quantitative data were analysed using the Statistical Package for the Social Sciences (SPSS) and the R programming language. In addition, two semi-structured interviews were undertaken with the leaders of each village, and the resulting qualitative data were analysed thematically. Results: The study found that the village leaders of Handong-ri and Jeoji-ri successfully encouraged trust and participation among village residents, suggesting that resident participation is largely influenced by the relevant stakeholders and the social capital of residents. Networking and intangible cultural heritages, such as rituals or village oral traditions, positively influence resident participation. Conclusion: This study suggests that the active utilisation of intangible cultural heritages and the networks developed by cooperating with essential stakeholders are vital for encouraging resident participation.
Why Social Capital Matters for the Success of REDD+ Programs
Why Social Capital Matters for the Success of REDD+ Programs
Woon Gwan Jung;Heesung Woo;Yohan Lee
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 227-237 (11 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
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Background and objective: We quantitatively estimated the impact of social capital on poverty reduction using a survey conducted on 335 randomly selected households in 6 villages running REDD+ programs in Bago Province, Myanmar. Our central question is whether the effectiveness of REDD+ programs is associated with social capital, including networks, trust, cooperation, and social inclusion. Methods: We developed a tool to measure social capital while considering forest conservation activities, and quantitatively analyzed the impact of social capital on poverty levels in 6 villages running REDD+ programs in Myanmar. Results: Our results reveal that social capital has a significant effect in alleviating household poverty in Myanmar. Thus, investment in social capital may help alleviate poverty. REDD+ training participants and community forestry members showed a relatively higher level of social capital than those who did not participate. We also found that forest dependents were statistically significantly more likely to live in poverty, which implies that socially marginalized residents tend to rely more on forests and that collecting forest products has limited effects on overcoming poverty. Conclusion: The local strategy for implementing REDD+ programs should target community forestry members to promote their social capital by supporting forest tenures and benefit sharing among marginalized people.
School Gardens Education Plan through the Awareness of Elementary and Middle School Parents
School Gardens Education Plan through the Awareness of Elementary and Middle School Parents
In-Kyoung Hong;Hyung-Kwon Yun;Young-Bin Jung;Sang-Mi Lee;Sang-Deuk Lee
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 107-122 (16 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
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Background and objective: This study was conducted on the value and operation of school garden education. It will be presented as basic data in considering the necessity of a policy for revitalizing school gardens and financial support, and can be used to find ways to facilitate education through school gardens. Methods: The collected data were analyzed using the 𝒙 2 test to obtain the frequency and weight of each measurement item, and the importance of each value was calculated by giving it a relative weight and directly evaluated so that the sum of importance was 100%. Results: In terms of the effectiveness of each value indicator of school gardens, parents of children who had experienced school gardens perceived them as having educational value (4.35 points) and parents of children who had not experienced school gardens perceived them as having health value (4.38 points). The average amount parents were willingness to pay voluntarily as a fee for school garden programs was 5,889 won and the highest amount was 30,000 won, and the average amount of government budget support parents saw as appropriate was 6,705 won and the highest was 100,000 won. Regarding the appropriate rate of education tax increase from the current rate of 30% the maximum percentage acceptable was 0.531-0.545%. Both parents of elementary and middle school students answered that educational value is the most important of the specific values of school garden service. Regarding the necessity of expanding school garden education, 89.8% of parents answered that the trend of increasing school garden education is appropriate, 93.2% answered that they were willing to have their children participate in school garden education in the future, and 81.2% answered that they would like to participate in school garden education in the future. Conclusion: The creation and utilization of school gardens is expected to continue to increase due to the diverse values and social atmospheres of school gardens, and this study provides policy data to vitalize school garden education in the future.
Growth Characteristics by Plug Tray Cell Size, Soil Type, and Fertilizer Concentration for Plug Seedling Production of Veronica pusanensis Y.N. Lee
Growth Characteristics by Plug Tray Cell Size, Soil Type, and Fertilizer Concentration for Plug Seedling Production of Veronica pusanensis Y.N. Lee
Hye Jin Oh;Hyuck Hwan Kwon;Jin Ho Kim;WonWoo Cho;Sang-Yong Kim
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 143-152 (10 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
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Background and objective: This study was conducted to establish a stable seedling production system for Veronica pusanensis Y.N. Lee, a plant that is endemic to the Korean Peninsula and is a critically endangered species, distributed along the coast of Busan, Korea. Methods: In order to investigate the plug cell size (72, 128, 200 cells), soil type (commercial substrate, and mixed substrates with peat moss and perlite at ratios of 1:1, 3:1, and 4:1), and fertilizer concentration (Peters 0, 500, 1,000, and 2,000 mg⋅L-1) conditions, the plug tray was filled with soil and seeds were sown. The sown trays were placed in the growth chamber (25°C, 70% RH, PPFD 100 μmol⋅m-2⋅s-1) for three repetitions per treatment. Results: There was no difference in the growth of seedlings according to plug cell size. Therefore, it appears to be economically superior to produce seedlings in a 200-cell plug tray. In soil type, the seedling growth increased as the ratio of peat increased, but leaf chlorosis occurred from the 7th week after sowing. Examining the growth of seedlings based on fertilizer concentration, the greatest increase in growth was found to have occurred in the 1,000 mg⋅L-1 treatment. Conclusion: Therefore, for the production of V. pusanesis seedlings, it was noted that when mixed soil with peatmoss and perlite at a ratio of 4:1 is filled in 200-cell plug trays, and the seedlings are fertilized with Peters 1,000 mg⋅L-1 once a week, growth will increase the most, demonstrating excellent cost-effectiveness. However, to mass-produce high-quality seedlings in a short period, it will be necessary to use a plug tray smaller than 200 cells or to conduct various fertilization composition studies.
Semantic Network Analysis of Newspaper Articles related to Agro-healing
Semantic Network Analysis of Newspaper Articles related to Agro-healing
Yumin Park;Yong-Wook Shin
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 167-176 (10 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
초록보기
Background and objective: Despite the fact that the COVID-19 pandemic has increased the demand for mental health services, access has been limited, resulting in service gaps and severance. Agro-healing, which is expected to be utilized successfully to promote mental health for both individuals and communities, could be a solution. This study was conducted to provide basic data for revitalizing policies and research related to agro-healing by analyzing the trends in big data of online news articles over the last decade. Methods: A total of 2,310 news articles related to agro-healing were collected from January 1, 2012 to December 31, 2021 by crawling Naver News. To extract nouns with practical meaning, the Okt morphological analysis of the KoNLPy module in Python 3.9 was employed. Semantic network analysis was conducted to validate degree centrality, betweenness centrality, and eigenvector centrality in order to understand the centrality and connectivity of significant keywords. The data was visualized using Gephi 0.9.2 by performing CONCOR analysis to generate clusters. Results: The keywords with the highest degree centrality were agro-healing, followed by healing, care farm, vitality, RDA, citizens, and rural tourism. Agro-healing, Healing, stress, urban, disabilities, care farm, dementia, and rural area were highest in terms of betweenness centrality. The eigenvector centrality was highest in agro-healing, followed by vitality, healing, care farm, and effect. As a result of the CONCOR analysis, four clusters were identified: ‘agro-healing characteristics’, ‘agro-healing resources’, ‘agro-healing activities’, and ‘agro-healing target and effect’. Conclusion: According to the findings, social expectations and need for agro-healing to improve public health became a significant part of the discourses. This research is expected to help determine future research and policy directions, as the vitality of agro-healing continues to provide national welfare services and seek sustainable growth in agricultural and rural areas.
인간식물환경학회지 제25권 제2호 목차
인간식물환경학회지 제25권 제2호 목차
편집부
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 1-2 (2 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
* 이 논문은 저작권자의 요청으로 무료로 제공됩니다.
Analysis of Importance and Performance of Mountain Village Revitalization Policy for Balanced Regional Development: Focused on Forestry and Agriculture Policy in 8 Regional Governments
Analysis of Importance and Performance of Mountain Village Revitalization Policy for Balanced Regional Development: Focused on Forestry and Agriculture Policy in 8 Regional Governments
Jin-Hae Chae;Seong-Hak Kim;Byung-Hoon Kang
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 213-226 (14 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
초록보기
Background and objective: Due to the recent demographic crisis driving the extinction of certain local communities, it is necessary to promote core projects to revitalize mountain village and rural areas. Methods: This study collected a total of 443 policy projects based on major policies and major business plans in the forestry and agricultural sectors of the eight regional governments in 2021. The collected 443 policy projects related to revitalizing the mountain villages were classified by 3 experts into 5 domains in the forestry sector, which further broke down into 27 types, 3 domains in the agricultural sector, and which further broke down into 23 types, for a total of 8 domains and 50 types, and an online survey of 42 policy stakeholders was then conducted. Analysis methods were t-test and Importance-Performance Analysis (IPA), and implications were derived through comparison between forestry and agricultural sectors. Results: The analysis produced several findings. first, it was positive that many projects in the sustainability field appeared in both forestry and agricultural sectors, but it was found that the policy projects needed to be reviewed due to the lack of types corresponding to projects in the intensive promotion area. Intensive core efforts included discovering forest cultural assets and creating forests to improve the environment. Second, it is necessary to pay attention to the forestry policy sector, as the forestry policy sector were generally lower in importance and performance than the agricultural policy sector. Third, the domains with high importance and performance to mountain village revitalization were forest welfare services , improving settlement environment , and increasing incomes while the domains with low importance and performance were mountain villages and forest culture areas. Conclusion: In summary, to revitalize mountain villages in response to the issue of the pending extinction of local communities, forest welfare service projects should continuously be promoted and strategic responses are required for discovering forest cultural assets and creating forests for environmental improvement, which are suggested as key strategic project types.
Growth and Physiological Responses of Pseudolysimachion pusanensis (Y. N. Lee) Y. N. Lee to NaCl Treatment
Growth and Physiological Responses of Pseudolysimachion pusanensis (Y. N. Lee) Y. N. Lee to NaCl Treatment
Hyuck Hwan Kwon;Hye Jin Oh;WonWoo Cho;Young Hyun Kwon;Seung Hyuk Yang;Sang-Yong Kim
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 133-141 (9 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
초록보기
Background and objective: This study was conducted to determine the effect of NaCl on the growth, antioxidants (superoxide dismutase, proline), maximum quantum yield, and chlorophyll contents of Pseudolysimachion pusanensis. Methods: Five levels of NaCl concentrations (0, 50, 100, 200, 400 mM) were used for treatment. Results: The growth according to NaCl concentrations was highest at 50 and 100 mM, but root growth declined before the top from 200 mM or higher. The increase in NaCl concentrations also led to the increase in SOD and proline content compared to the control plot, whereas it decreased chlorophyll content. There was no difference in the maximum quantum yield at 0, 50, 100, and 200 mM, but it decreased at 400 mM. Conclusion: The results proved that P. pusanensis showed an increase in SOD and proline content at 50 and 100 mM of NaCl treatment compared to the control plot, indicating that it receives salt stress, but the growth was excellent at 50 and 100 mM. In addition, there was no difference in top growth up to 200 mM compared to the control plot, and there was no significant difference in the maximum quantum yield, which proved that P. pusanensis has strong tolerance to salt stress.
Perception and Intent to Participate of Indigenous Residents on Rural Tourism and Urban-Rural Exchange in Namhae County, South Korea
Perception and Intent to Participate of Indigenous Residents on Rural Tourism and Urban-Rural Exchange in Namhae County, South Korea
Myeong Sik Park;Inhea Kim;Keun Young Huh
인간식물환경학회 / 인간식물환경학회지(JPPE) 제25권 제2호 / 2022 / 195-211 (17 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 식물학 / KCI : 자연과학 > 자연과학일반
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Background and objective: Rural tourism and urban-rural exchange projects require positive perception and participation of local residents. This study was conducted to analyze the perception and participation of indigenous residents and to propose ways to increase their intent to participate. Methods: A survey was conducted to analyze indigenous residents’ perception of visitors, migrants, rural tourism and urban-rural exchange projects, and local government. The results were compared with the perceptions by visitors or migrants. In order to propose a plan for increasing their intent to participate, an equation composed of 5 explanatory variables was derived through stepwise multi-regression analysis. Results: Indigenous residents were older, had a lower level of education compared to visitors or migrants, and perceived that the key motive of visitors was mainly enjoying the natural scenery and that having fun with family/friends was less important. Visitor satisfaction and intent to revisit were perceived to be lower. They were positive about the settlement of migrants. They generally rated tourism attributes low. They had a strong image of local agricultural products. They perceived that the awareness of rural tourism and urban-rural exchange projects was low, but the necessity was very high. For information source, they were less dependent on people around them and did not use much internet or social media. They perceived that the local revitalization was well performed, but the income from increased visitors was not as high as they expected. They strongly perceived the necessity of the local government’s role, but the level of its support was low. Conclusion: Their perceptions tended to be consistently ’undervalued overall compared to those of visitors or migrants. Their intent to participate can be effectively increased by preferentially improving awareness, partnership with migrants, and local government support focusing on income generation; reinforcing and proving the expertise of the department in charge; and spreading positive information about the success of major tourism resources.
Characterizations on orbital inverse limit systems
Characterizations on orbital inverse limit systems
주항연(Hahng-Yun Chu);이나경(Nakyung Lee)
충청수학회 / Journal of the Chungcheong Mathematical Society 제35권 제1호 / 2022 / 69-76 (8 pages)
자연과학>자연과학일반 / KDC : 순수과학 > 수학 / KCI : 자연과학 > 수학
초록보기
In this article, we investigate minimality, transitivity and mixing property for a shift map on the orbital inverse limit systems.