• 응용통계연구
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• 제25권3호
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• pp.389-401
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• 2012

This paper derives a benchmark dose(BMD) and its 95% lower confidence limit(BMDL) using a semi-parametric regression model for small lead based changes in attention-deficit hyperactivity disorder(ADHD) scores in the first wave of the Children's Health and Environment Research(CHEER) survey data, which have been regularly collected in South Korea since 2005. Ha et al. (2009) showed that the appearance of ADHD symptoms had a borderline trend of increasing with the blood lead concentration. Butdz-J${\o}$rgensen (EFSA, 2010a) derived the BMDL of lead corresponding to a benchmark region of 1 full intelligent quotient (IQ) score using the raw data in Lanphear et al. (2005, EHP). European Food Safety Authority (EFSA, 2010b) determined the BMDL of $1.2{\mu}g/dl$ as a reference point for the characterization of lead when assessing the risk of the intellectual deficit measured by IQ scores. Kim et al. (2011) indicated that an even lower BMDL could be obtained based on the ADHD score; however, the BMDLs depended heavily upon the model assumptions. We show in this paper that a semi-parametric approach resolves the model dependence of BMDLs.

• 대한안전경영과학회지
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• 제11권2호
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• pp.69-75
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• 2009

This paper was proposed to show the comprehensive review of laws and regulations on the musculoskeletal disorders (MSDs) that are being established and carried out in various countries. Ten countries including USA, Canada, Australia, Japan, and 6 European countries which were regarded as the leaders in the prevention of MSDs were selected for review. Comparative analysis were performed on the laws, regulations, and guidelines of MSDs among different countries. The purpose of this study was to investigate the status of the various efforts of the advanced countries concerning on preventing MSDs and suggest the improvement factors that might be introducible to Korean policies. Some recommendations were made to improve the appropriateness and efficiency of our MSDs prevention policies based on the comprehensive review and comparative analysis. It is expected that the results of this study would be used as valuable information when revising relevant legal system.

• 농촌의학ㆍ지역보건
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• 제37권3호
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• pp.111-130
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• 2012

Objective: The purpose of this study was to identify and compare social capital measurement tools for the convenient use in public health studies. Method and result: This study examined and compared social capital tools developed individually by the World Bank, the OECD, the United States, United Kingdom, Canada, Australia, Ireland, and Korea. A comprehensive framework was constructed with six conceptual dimensions and sixteen indices. The six dimensions included Membership, Network, Trust, Information and communication, Social and civic participation, and Social cohesion and exclusion, which connoted the structural, cognitive, bonding, bridging, operative, and output elements. The indices of each tool were respectively matched to the indices of the comprehensive framework. The comprehensive tools were Integrated Questionnaire for the Measurement of Social Capital (SC-IQ) of the World Bank with 27 questions and the European Social Survey (ESS) of the OECD with 80 questions. Conclusion: The SC-IQ should be utilized in public health studies due to its simplicity yet comprehensiveness as a social capital tool. The ESS should also be considered as a comprehensive tool.

• 유통과학연구
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• 제18권10호
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• pp.121-130
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• 2020

Purpose: In this study we investigate the determinants of private label (PL) purchase intention in South Korea. Private labels are becoming more and more popular in America and European countries. However, there are not enough studies focusing on PL within the South Korean market. Therefore, the present study has been written in order to understand more about consumers' purchase intention of store brand in the South Korean market. Many characteristics and aspects of consumers and brand's behavior have been reviewed in order to bring relevant results. Research design, data and methodology: Data was collected using a quantitative survey of Korea retail store's consumer. We analyzed using multiple regression method to test the hypothesis. We analyzed how and why do consumers have a strong intention to purchase the PL. Results: a) Trust towards retailer influences the PL purchase intention of customers; b) brand awareness has an impact on the PL purchase intention of customers; c) perceived quality has an impact on the PL purchase intention; d) Price-quality relationship influences on the PL purchase intention. However, there is no direct effect of some of the factors of determinant. Conclusion: For private label products in the Korean market, trust in sellers and brand awareness influences the purchase of PL products.

• Mycobiology
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• 제42권4호
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• pp.391-396
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• 2014

In the past two decades, European ash trees (Fraxinus spp.) have been severely damaged due to ash dieback disease, which is caused by the fungal species Hymenoscyphus fraxineus (Chalara fraxinea in the anamorphic stage). Recent molecular phylogenetic and population genetic studies have suggested that this fungus has been introduced from Asia to Europe. During a fungal survey in Korea, H. fraxineus-like apothecia were collected from fallen leaves, rachises, and petioles of Korean ash and Manchurian ash trees. The morphological and ecological traits of these materials are described with the internal transcribed spacer rDNA sequence comparison of H. fraxineus strains collected from Korea, China and Japan.

• The Journal of Asian Finance, Economics and Business
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• 제7권8호
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• pp.353-360
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• 2020

The main aim of study is to identify the factors that affect the purchasing intention of young adults. The reference group is an important factor in determining the underlying causes of young adults' purchasing intentions. However, the literature states that young adults prefer to buy brands they trust in order to eliminate the risks that may arise when buying products they may not know. Moving from this perspective, the study proposes a conceptual model that including structural relationships between brand trust, reference group, and purchasing intention. The study aims to contribute to the literature by discussing the moderator role of brand trust in this structure. A series of hypotheses are tested via a survey completed by 749 young people between the ages of 20 and 30 living in Istanbul, Turkey. The data were analyzed with IBM SPSS-23 and AMOS-18 program. In addition to descriptive, reliability, and factor (exploratory and confirmatory) analysis, hierarchical regression analysis was performed to test the research hypotheses. The results show that the reference group positively influences the purchasing intention, and brand trust plays a moderating role in this relationship. The findings are discussed and some practical suggestions are made for mobile phone manufacturers.

• 천문학회보
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• 제39권1호
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• pp.38.2-38.2
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• 2014

Radial light profiles of bars are known to be related to the morphology of their host galaxies in a way that bars in early type disk galaxies show flat radial light profile, while bars in late type disk galaxies show exponential profile. To quantify how flat or steep bar profiles are, we have performed detailed two-dimensional decompositions on 3.6 micron images for 144 barred galaxies from the Spitzer Survey of Stellar Structure in Galaxies (S4G), and then modeled bar profiles with Sersic functions. We find that bars in classical bulge, higher bulge-to-total (B/T) galaxies are flatter than bars in bulgeless, lower B/T galaxies. In particular, we find that the presence of a bulge almost always guarantees that the bar is flat. Conversely, bulgeless galaxies, mostly have bars with steep profiles. This implies that the light profile of bars may be a dynamical age indicator of bars. We also find that the shape of bars are boxy and do not change with B/T. This indicates that as galaxies evolve, bars change their light profile while keeping their outermost shape boxy.

• 항공우주산업기술동향
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• 제9권1호
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• pp.139-149
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• 2011

액체 로켓 엔진의 연소기는 높은 온도의 연소가스를 발생시키므로 연소실과 노즐은 열적으로 보호되어야 한다. 고공 엔진의 노즐확장부도 고열에 견딜 수 있게 설계되어야 하며, 이를 위하여 가스냉각, 삭마냉각, 복사냉각등 다양한 방법의 냉각이 적용되고 있다. 특히 큰 노즐 팽창비를 갖는 상단엔진의 경우 무게가 발사체 성능에 미치는 영향이 크므로 경량 내열 소재가 개발되어 사용되어 왔다. 미국과 러시아, 유럽에서 사용되어 온 노즐확장부 재료를 조사한 결과 스테인리스강과 티타늄합금과 같은 무거운 금속 재료에서 경량의 탄소섬유 강화 복합재 또는 세라믹 복합재로 바뀌어 가는 경향이 파악되었다.

• Journal of Contemporary Eastern Asia
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• 제20권1호
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• pp.44-72
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• 2021

This study analyses North and South Koreas' coverage as framed by the main Polish press titles from 1989 to 2019. The main method applied is a computational textual analysis of press articles based on frequency, correlations and co-occurrences. The purpose is to map the topics of the examined articles in the context of relations between Poland and the two Koreas in various areas, predominantly political and economic relations. Emphasis is placed on the impact the carmaker Daewoo's investment in Poland in the mid-1990s had on bilateral Polish-South Korean relations. First, the authors argue that Korean issues in the Polish press, mainly in the second half of the 1990s, particularly concerned economic affairs. Secondly, they argue that after Poland's accession to the European Union in 2004, the country's interest in the two Koreas decreased, and since that time has remained at a more or less constant level. Finally, the authors discuss the outcome of the research in the context of the main developments in Polish-Korean relations, taking into consideration the results of a Polish public opinion survey presenting the international linkages between national public opinion and foreign policy.

• 한국환경과학회지
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• 제31권8호
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• pp.727-733
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• 2022

The contingent valuation method (CVM) is one of the most commonly used and effective methods to evaluate non-use value of resources. Reasonable application of CVM to value the cultural heritage is the key process of evaluation. CVM was used to evaluate the non-use value of cultural heritage of Taishan Mountain combined with questionnaire survey and field research in this study. The results indicated that the importance of the degree of the three components of non-use value was heritage value ranked highest (40.22%) > followed by existence value (38.58%) >then option value (21.20%). In addition, the rate of willingness to pay was 54.52%, the average and median values of per person were 40.17 CNY·a^-1 and 20.00 CNY·a^-1 and the non-use values of Taishan Mountain cultural heritage was 33 million CNY·a^-1. The median value of WTP was consistent with Asian countries but was lower than European and American countries. Factors influencing WTP showed that monthly income and satisfaction with Taishan Mountain were correlated to WTP, and family location and willingness to revist were correlated remarkably with WTP. In addition, monthly income was correlated remarkably with WTP value, however other factors were not. The results showed the importance and necessity of protective development of Taishan Mountain cultural heritage, which would be used as an important reference for decision makers.