• Korean Journal of Plant Resources
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• v.32 no.4
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• pp.290-295
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• 2019

This study was carried out to select the optimal condition for prothallus propagation and sporophyte formation of Leptogramma pozoi (Lag.) Ching subsp. mollissima (Fisch. ex Kunze) Nakaike and to provide basic data for mass production system. In the propagation, 300 mg of prothallus were inoculated in different kinds of medium [1/4, 1/2, Murashige and Skoog (MS), Knop], sucrose (0, 1, 2, 3, 4%), and cultured for 8 weeks. Sporophyte formation studies were carried out by inoculating blended prothallus into artificial soils. The soils were mixed with horticultural substrate, peatmoss, perlite, and decomposed granite at different ratios or only with the horticultural substrate. Then the prothallus was cultivated for 12 weeks to figure out the formation and growth of the sporophytes. The growth and development of prothalli were excellent on MS medium. According to medium components, prothallus growth was favorable in all treatments except 0% sucrose treatment and the highest in 2% sucrose. In the experiment of soil mixtures, sporophyte formation was the highest in the horticultural substrate:perlite 2:1 (v:v) and horticultural substrate:decomposed granite 2:1 (v:v) treatment, and the overall growth was good in the horticultural substrate:decomposed granite 2:1 (v:v) mixed soil.

• Journal of Labour Economics
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• v.32 no.1
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• pp.1-29
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• 2009

This paper exploited the data reported in BK21 program of professors' research performances and analyzed the effects of reputational concerns on professors' research performances. According to the established theory of reputation effects in incentive provision, a professor's research incentive gets stronger if one's ability is less known, and one's colleagues' abilities are better known. We confirmed this theoretical hypothesis of reputation effects. Moreover, we found that a professor's research incentive was larger under inter-generational grouping in terms of age distribution and homogeneous grouping in terms of ability uncertainty.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.293-295
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• 2010

본 논문은 문서의 의미특징과 퍼지를 이용한 새로운 문서군집 방법을 제안한다. 제안된 방법은 비음수 행렬 분해된 의미특징을 이용하여 군집 레이블과 군집의 대표 용어들을 선택함으로서 문서군집의 내부구조를 더 잘 표현할 수 있으며, 퍼지를 이용한 군집은 문서군집에 유사하지 않은 문서를 더 잘 구분함으로써 문서군집의 성능을 높일 수 있다. 실험결과 제안방법을 적용한 문서군집방법이 다른 문서군집 방법에 비하여 좋은 성능을 보인다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.691-694
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• 2008

인간의 지식을 컴퓨터에 저장하기 위한 연구 중 하나로 온톨로지가 등장하게 되었다. 온톨로지는 최근 주목 받고 있는 시맨틱 웹을 구현하기 위해 필수적으로 필요할 뿐만 아니라 다른 형식으로 저장된 정보 사이의 공유를 위해서도 많은 연구가 진행되고 있다. 특히 온톨로지의 초기 설계 후 변경을 하기 위해서는 매우 큰 비용이 소모된다는 점에서 온톨로지 설계에 대한 연구 역시 진행되고 있다. 본 논문에서는 온톨로지 설계를 위한 단계적인 온톨로지 정규화 기법을 제안한다. 제시된 온톨로지 정규화는 기존의 제시된 데이터베이스 정규화 기법을 활용하여, 단계적으로 더 엄격한 정규화가 가능하도록 설계되어 있다. 이러한 정규화 기법의 적용을 통해서 비효율적인 온톨로지 설계를 수정하고 짜임새 있는 설계가 가능하도록 온톨로지를 수정하는 기법을 제안한다.

• Journal of Korean Academic Society of Home Health Care Nursing
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• v.30 no.1
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• pp.105-114
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• 2023

Purpose: This study aimed to comprehensively analyze the recent revision of the Outcome and Assessment Information Set (OASIS)-D to version E in the United States to identify the most recent trends in home health care and provide suggestions for implementing home health care in Korea. Methods: This study is a comprehensive literature review. We compared all items in OASIS-D and OASIS-E and identified the most significant changes. Additionally, we have discussed the context in depth. Results: The addition of items related to health literacy and medication reconciliation, strengthening assessment in the cognitive and mood domains, and improving items related to pain assessment were identified. These major revisions resulted from a greater emphasis in the healthcare field on social determinants of health. Additionally, the COVID-19 outbreak highlighted the importance of monitoring and managing the symptoms of home care patients in the community. Conclusion: The key items of the OASIS amendment and their background analysis proposed in this study could serve as a cornerstone for the revision of home health care assessment tools or the development of systematic common assessment tools in Korea.

• The Journal of the Korea Contents Association
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• v.19 no.8
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• pp.151-158
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• 2019

The high-technological in the electric and electronic industries is recognized in overseas markets as well. However, the competition for technologies in these industries is increasing. Therefore, electric and electronic firms should be more efficient in their production. so, This paper analyzes the efficiency of High-growth Electrical and Electronics firms using DEA model. We evaluate the CCR, BBC efficiency and RTS(return to scale) of 20 Korean high-growth Electrical and Electronics firms. There are a total of 12 efficient DMUs with a BCC of 1. There are a total of 4 efficient DMUs with a CCR of 1. A total of 11 DMUs were IRS in Scale Efficiency and a total of 6 DMUs were CRS in Scale Efficiency and a total of 3 DMUs were DRS in Scale Efficiency. We also suggest the Electrical and Electronics firms which can be benchmarked based on analyzed information.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.5 no.4
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• pp.435-442
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• 2015

The purpose of this study is to examine the effect of mentoring program using logic model in university students. We surveyed 40 mentors who participated mentoring program in 2014. Data collection were open-ended questions. Questions was made of with a steps in logic model and content analysis was carried out. The results are as follows: first, according to the step of the inputs, many students questioned said that public relations, selection process, matching, orientations, activity costs was proper. Secondly, in the activities, it was showed that mentor met firstly mentee with teacher in school and mentoring activities comprised 80% of studying and 20% of counseling and experiencing. third, in the outputs, most of participants expressed satisfaction in mentoring period, time, place. Lastly, in the outcomes, this program affected both mentor and mentee with cognitive, emotional and behavior development. Consequentially, this results have influence on improvement of following mentoring programs.

• The Korea Journal of Herbology
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• v.29 no.2
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• pp.15-21
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• 2014

Objectives : The purpose of this study was to investigate inhibitory effects of steamed Polygonatum odoratum extract (POE) on differentiation and adipogenesis in 3T3-L1 adipocytes. Methods : Polygonatum odoratum (P. odoratum) extract was extracted with ethyl acetate. Total phenolic and flavonoid contents in POE were measured for antioxidant activity. The spectrophotometric method was used to determine the DPPH and ABTS radical scavenging activity and ferric-reducing antioxidant potential (FRAP). MTT assay was examined for cell toxicity, oil red O staining was performed for intracelluar adipogenesis in differentiated 3T3-L1 adipocytes. Western blot analysis for measurement of CCAAT/enhancer-binding protein ${\alpha}$ ($C/EBP{\alpha}$), peroxisome proliferator-activated receptor${\gamma}$ ($PPAR{\gamma}$) and AMP-activated protein kinase (AMPK) expressions were performed. Results : The results revealed that POE has antioxidant activities. Contents of total polyphenolics and flavonoids were $50.83{\pm}1.52$ GAE mg/100g dry weight of POE and $17.05{\pm}2.47$ RE mg/100g dry weight of POE, respectively. DPPH radical scavenging activity, and FRAP in 10 mg/ml concentration were $92.1{\pm}0.6%$, $244.8{\pm}9.0{\mu}M$ Fe(II) and ABTS inhibition in 5 mg/ml concentration was $84.8{\pm}4.1%$. Treatment of POE in adipocytes inhibited the differentiation and adipogenesis of 3T3-L1 adipocytes compared to those of vehicle control. Additionally, protein expressions of $C/EBP{\alpha}$ and $PPAR{\gamma}$, major transcription factor for the adipogenic genes, were significantly decreased compared to those of vehicle control (p<0.05). Futhermore, phosphorylation of AMPK was increased in 3T3-L1 adipocytes treated with POE compared to that of vehicle control (p<0.05). Conclusions : we demonstrate that steamed P. odoratum extract (POE) has potentiating antioxidant activities, inhibits differentiation and lipid accumulation and also induces energy expenditure in adipocytes, which may contribute to antiobesity property.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.49 no.3
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• pp.193-201
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• 2023

Hydrogen peroxide (H₂O₂) is a type of active oxygen species (ROS) that causes oxidative stress in cells and affects cell growth, proliferation, senescence, and death. The purpose of this study is to find active peptides that attenuate cytotoxicity of H₂O₂. A positional scanning synthetic tetrapeptide combinatorial library was screened to predict the sequence of potentially active peptides. As a result of comparing the effect of peptide pools on H₂O₂-induced death of human keratinocytes (HaCaT cells), various active peptide sequences were predicted. Especially, peptides containing cysteine (C) residue were predicted to be active. In follow-up experiments, the cytotoxicity and activity of cysteine-containing peptides of different lengths, such as C-NH₂, CC-NH₂, CCC-NH₂, and CCCC-NH₂ were examined. C-NH₂ and CC-NH₂ showed no significant cytotoxicity up to 1.0 mM, but CCC-NH₂, and CCCC-NH₂ showed relatively strong cytotoxicity. C-NH₂ and CC-NH₂ alleviated H₂O₂-induced cytotoxicity. CC-NH₂ was more cytoprotective compared to C-NH₂, C, N-acetyl cysteine (NAC), and glutathione (GSH). When intracellular ROS was measured by flow cytometry, H₂O₂ increased ROS production, and CC-NH₂ suppressed ROS production more effectively than C-NH₂, and it was as effective as C, NAC, and GSH. This study suggests that CC-NH₂ of the cysteine-containing peptides of different lengths has an antioxidant property that safely and effectively alleviates H₂O₂-induced cytotoxicity and ROS production.

• 한국사회정책
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• v.25 no.4
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• pp.233-263
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• 2018

This study sought to identify gender-specific mechanisms of increased suicide rates during economic crises in South Korea. In order to address research aims, we focused on two international economic crises: IMF financial crisis in 1997, and international recession in 2008. This study provides three main findings. First, different mechanisms increased suicide rates during the two economic crises. Particularly, the high level of unemployment raised suicide rates during the 1997 IMF while the high level of working poor in the 2008 recession. Second, suicidal risk patterns for men and women differed at each period. The 1997 crisis which mostly affected full-time permanent workers had had relatively greater impacts on men suicide, whereas the 2008 crisis which affected precarious workers had done on women suicide. Finally, our finding indicated that these gender-specific risk patterns had been derived from the gendered labour market and male-friendly social policy. Placing women at the periphery of the labor market and using them as a buffer in times of crisis, governments failed to protect them from their economic difficulties. Suicide is fundamental and important public health and social problems. These findings suggest that the national suicide prevention strategy should pay attention to the social determinants of suicide through gendered as well as population health perspectives.