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한현우,이승현,윤춘식,홍성진,정선우 한국환경과학회 2024 한국환경과학회지 Vol.33 No.2
The community structure of benthic macroinvertebrates in the Madongho Wetland protected area and inflow river located in Goseong-gun, Gyeongsangnam-do, was investigated in 2022 and 2023. We collected and identified 3,582 individuals belonging to 7 classes, 23 orders, 51 families, and 78 species over the 2 years from six sites. Gnorimosphaeroma naktongense was the dominant species with a ratio of 20%, and Caridina denticulata denticulata was the subdominant species with a ratio of 13.32%. Predators and gathering collectors were the most abundant in the functional feeding group, while sprawlers were the most diverse and numerous in the habitual dwelling group. Diversity, richness, dominance, and evenness were calculated as the biological indices. In addition, various biological water quality indices were calculated. Most insects in the inflow rivers belonged to group Ⅰ in evaluating relative resistance and resilience, showing high colony stability. The results of analyzing the correlation between salinity and substrate particle size with brackish water species showed that Gnorimosphaeroma naktongense and Hediste japonica had a significant positive correlation with salinity, while Assiminea lutea and Neomysis awatschensis had a significant positive correlation with substrate particle size. Additionally, Sinelobus kisui was found to be a new record of Korean Tanaididae in this study.
Determination of Physical Properties for Discrete Element Model on the Nanji-Type Garlic Cloves
한현우,임동우,조승제,박영준 한국농업기계학회 2022 바이오시스템공학 Vol.47 No.4
Purpose Agricultural machines, which increase the convenience of agricultural work and enable mass production, are mechanical systems that inevitably interact with organisms based on the characteristics of handling agricultural products. Such crop-mechanical systems often form discrete systems by integrating a large number of agricultural products within the machines. The discrete element method (DEM) is an efective numerical method that is applicable to such discontinuous mechanical systems. However, the information required for a DEM model, such as the shapes, weights, and mechanical properties of crops, is difcult to obtain based on the characteristics of organisms with atypical and large dispersion. Therefore, this study aimed to develop a calibration process that can estimate and verify DEM model parameters for Nanji-type garlic cloves. Methods The DEM model considers the statistical properties and shape parameters of 500 garlic clove samples and is a cluster model composed of three spherical particles. The Hertz–Mindlin contact model was adopted, and the required parameters for the contact model, including the equivalent Young’s modulus and friction coefcient, were estimated, compared, and verifed based on actual compression and shear test results. Results Simulation results using the calibrated DEM model are in good agreement with the results of compression and shear tests. Further, the statistical properties of crop shape and weight were refected in the DEM model. Conclusion The fndings will aid the analysis of crop-mechanical systems. In particular, the proposed method has applicability in the design and analysis of planters and harvesters.
중증지체장애인의 자립생활에 미치는 영향 : 장애수용의 매개효과를 중심으로
한현우,이수민 한국성인계속교육학회 2023 성인계속교육연구 Vol.14 No.4
This study aims to analyze the factors that influence the independent living of people with severe physical disabilities, verifying the mediating effects of independent variables such as physical function level, disability acceptance, and self-esteem. The study involved 131 patients from A Rehabilitation Hospital and was conducted through descriptive statistical analysis, T-tests, regression analysis, and bootstrapping. The results of the study are as follows: First, the perception of independent living was higher in the paradigmatic perception of rehabilitation. Second, between the patients with spinal cord injuries and the with brain diseases, the level of disability acceptance was significantly higher in the with brain diseases, while self-esteem was significantly higher in the with spinal cord injuries. Third, in the regression analysis of variables related to independent living, self-esteem did not have a significant impact. Fourth, the level of physical function showed a partial mediating effect on disability acceptance in relation to independent living.
리듬분석을 통해서 바라본 대학생 일상에서의 경력개발에 관한 연구
한현우 한국수산해양교육학회 2019 水産海洋敎育硏究 Vol.31 No.4
The success of employment policy is a integrative recognition through diverse analysis methods and theoretical frames. In this context, this study was done basic research for policy plan in college students. Concretely, this study’s purpose is to understand college student’s career development process, by using a ethnography and rhythm analysis theory. Rhythm is a kind of result of repeatedly interaction on certain space. The performers occasionally have been subordinated by rhythm but they could be able to make a new rhythm through interaction each other. So, rhythm theory could provide integrative perspective about particular phenomenon. Research findings are as below. First, in aspect on the space, learning space of college student have changed from traditional learning space lecture room to cafe. Second, in aspect on the time, they are spending to study about spec not a major field of study. Third, career development ‘s rhythm is simplified than the past. Because they have faced the social press so, they could not participate diverse activities, experiences. Consequently, their career development types deduct inertia rhythm, regulation rhythm, zero rhythm. In order to the identity of the university as a traditional educational space has been weaking by another learning space cafe. So, we have to deal with to understand multifaceted way college student’s career development and to support their career development.