• Journal of Environmental Health Sciences
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• v.46 no.3
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• pp.285-296
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• 2020

Objective: The objective of this study was to describe the characteristics of exposure to humidifier disinfectants (HDs) and their association with the presence of a person who experienced the adverse health effects in general households in Korea. Methods: During the month of December 2016, a nationwide online survey was conducted on adults over 20 years of age who had experience of using HDs. It provided information on exposure characteristics and the experience of health effects. The final survey respondents consisted of 1,555 people who provided information on themselves and their household members during the use of HD. Exposure characteristics at the household level included average days of HD use per week, average hours of HD use per day, the duration within which one bottle of HD was emptied, average input frequency of HD, amount of HD (cc) per one time used, and active ingredients of HD products (PHMG, CMIT/MIT, PGH, or others). The risk of the presence of a person who experienced adverse health effects in the household was evaluated by estimating odds ratios (ORs) and 95% confidence intervals (CIs) adjusted for monthly income and region using a multiple logistic regression model. Subgroup analyses were conducted for households with a child (≤7 years) and households with a newborn infant during HD use. Results: The level of exposure to HD tended to be higher for households with a child or newborn infant for several variables including average days of HD use per week (P<0.0001) and average hours of HD use per day (P<0.0001). The proportion of households in which there was at least one person who experienced adverse health effects such as rhinitis, asthma, pneumonia, atopy/skin disease, etc. was 20.6% for all households, 25.3% for households with children, and 29.9% for households with newborn infants. The presence of a person who experienced adverse health effects in the household was significantly associated with average hours of HD use per day (P_trend<0.001), duration within which one bottle of HD was emptied (P_trend<0.001), average input frequency of HD (P_trend<0.001), amount of HD per one use (P_trend=0.01), and use of HDs containing PHMG (OR=2.23, 95% CI=1.45-3.43). Similar results were observed in subgroup analyses. Conclusion: Our results suggest that level of exposure to HD tended to be higher for households with a child or newborn infant and that exposure to HD is significantly associated with the presence of a person who experienced adverse health effects in the household.

• Korean Journal of Child Studies
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• v.33 no.4
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• pp.1-17
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• 2012

This study examined the developmental trajectories of perceived level of stress and depression in Korean youth using longitudinal data from the Korean Youth Panel Study (KYPS) of 2,844youth (1,524 boys) across $4^{th}$ grade through $8^{th}$ grade. Latent growth modeling indicated the presence of age-related, significant increases in stress and depression for both boys and girls. Girls experienced greater in stress and depression than did boys. Multiple group analysis indicated that there was no significant sex difference in effects of stress on depression. Overall, increases in stress were associated with increases in depression levels for both boys and girls. Conceptual and clinical implications of the findings were discussed.

• Journal of Korea Association of Health Promotion
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• v.2 no.1
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• pp.71-76
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• 2004

The Metabolic syndrome is a constellation of lipid and non-lipid factors of metabolic origin. The presence of any 3 of the following factors is considered sufficient for diagnosis : hypertension(BP <130/85mmHg), low HDL-cholesterol (<40mg% in men, <50mg% in woman), high triglyceride(>150mg%) and abdominal obesity(abdominal girth >102cm in men, 88cm in woman). The major adverse consequence of the metabolic syndrome is cardiovascular disease. Several studies have shown an association between metabolic syndrome and increased cardiovascular events. In Korea, the prevalence of the factor of metabolic syndrome has been increasing since 20 years previously when the Korean economy began to grow rapidly, with a resultant change in lifestyle, toward that of western countries. Thus, the management of the metabolic syndrome is an important social and medical issue in terms of the national health problem. This review will consider each factor in turn, providing insight for health care providers in an effort to prevention of cardiovascular events and maintenance of quality of life in persons with metabolic syndrome was discussed.

• Journal of the Korean Home Economics Association
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• v.48 no.9
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• pp.79-87
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• 2010

The purpose of this study was to investigate whether employed mothers' extended working hours have effects on childcare style and work-family conflicts. The data came from the 2007 Korean Longitudinal Survey of Women and Family(KLoWF) of the Korean Women's Development Institute. 475 females with preschoolers or elementary-school children were used in this study. The major findings can be summarized as follows: (1) Weekly average working hours varied by education, salary, and the presence of preschoolers. (2) The time of childcare was significantly shorter in mothers who work more than 50 hours/week (3) Mothers who worked more than 50 hours/week felt significantly high work-family conflict. These analyses pointed to the importance of obeying the law related to working hours as the most important thing to sustain work-family balance. Institutional foundations should be enabled to keep legal working hours.

• East Asian Economic Review
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• v.20 no.2
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• pp.191-228
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• 2016

This paper analyzes the role of absorptive capacity in R&D spillovers through strategic R&D investments in a game-theoretic framework. In the model, a firm's effective R&D is composed of idiosyncratic R&D, which produces its own innovations, and identical R&D, which improves absorptive capacity. The model shows that in the presence of absorptive capacity firms have a tendency to underinvest (overinvest) in idiosyncratic (identical) R&D relative to the social optimum. As the spillover becomes larger, firms decrease their own R&D while they become more inclined towards strategic exploitation of rivals' efforts. Since the former effect overpowers the latter, the total amount of R&D decreases as the spillover increases. This is socially undesirable, providing a potential justification for a governmental subsidy for idiosyncratic R&D and a tax on identical R&D. The findings may have important implications for newly industrialized or emerging countries that consider a redirection of national R&D policy and intellectual property rights (IPR) regime.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.11a
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• pp.39-42
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• 2003

A community can have a physical presence or can be formed from a group of people who communicate remotely via a conference call, a fixed Internet chatroom or instant message solution and most recently, a mobile handset. The mobile handset gives community members the advantage over fixed line or physical communities that they are not constricted by time or place as to when they can communicate with any members of their community. Operators, riding on the back of the SMS boom, are deploying community applications to increase both average revenue per user and customer loyalty. The purpose of this study is to find the effects of the characteristics of mobile community on the consumers'satisfaction and loyalty so that operators'participation in mobile community could be enhanced. A general model for the study was proposed with three independent variables. The variables are community usability(dialog and social support, information design, navigation, access), community sociability (purpose, people, policies), and mobile community content(location, personalization, immediacy, availability).

• Korean Institute of Interior Design Journal
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• v.13 no.4
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• pp.3-11
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• 2004

The origin of Uchida is strictly avant-garde and carries a social dimension. The work is a challenge to consumption-oriented mass production, a revolt against intrusive one-way communication, and an aversion to oppressive politics. Such a spirit led to a rare communication design that was created in collabolation with the user and designer, both relating to each other's senses of touch and in the same familiar plane. He first began by focusing on the physical movements of objects in order to achieve maximum comfort and lightness. From the beginning, He avoided strong, sturdy solids, and favored the faint, transitory and vulnerable. He choose the pursue "furniture with delicate lines", "to create darkness by layering shadows", all of which are extremely unique and resulted in designs that have a profound presence. Uchida gives various meanings and functions to the grid. This activities and philosophy of Uchida Shigeru influenced on the interior design.the interior design.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.319-322
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• 2003

Integrated coastal management (ICM) requires robust indicators that gauge the 'health' of the coast in relation to environmental, social and economic activities. Biological indicators(bio-indicators) offer a signal of the biological condition in an ecosystem. Using bio-indicators as an early warning of pollution or degradation in an ecosystem can help sustain critical resources. This review examines the rationale and value of selecting species as bio-indicators of human induced changes within estuaries, using examples from both the western and southern coast. It include a range of biological parameters relating to particular species, groups of species and biological processes. The use of these indicators is critically reviewed and the presence or absence of a relevant framework for their use in Korean ICM programs is discussed.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06b
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• pp.259-261
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• 2006

"e" 시대로 대변되는 21세기는 정보화라는 짧은 과도기적인 사회변화 상태를 지나 지식이 새로운 국가 경쟁력으로 평가되는 지식기반사회로 급속하게 이전하고 있다. 이와 같은 현실은 언제(Any-Time), 어디서 (Any-Where), 누구나(Any-One) 지식을 효과적으로 활용할 수 있는 수단으로 e-learning이 교육의 새로운 패러다임으로 각광받고 있다. 하지만 현재의 e-learning은 기존의 오프라인의 교육 운영 형태를 그대로 답습함으로서 전문가에 의해 매뉴얼화 된 프로세스 정보를 매개로 학습활동이 이뤄지고 있으며 서비스제공환경의 제약으로 인해 개인의 참여와 사용자간 참여의 한계에 직면해 있다. 본 논문에서는 기존 e-learning의 문제점을 개선하고자 상호 작용성을 통한 사회적 실재감(Social Presence)을 느낄 수 있도록 차세대 Web인 Web2.0의 적용을 통해 e-learning 활성화 방안을 모색하고자 한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1995.04a
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• pp.363-374
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• 1995

A duopoly model of R&D competition is presented to investigate whether an equilibrium R&D level with flexible spillovers is insufficient (or excessive) from the viewpoint of social welfare. The model focus on flexible spillovers which include much portion of externality occurring in R&D activity. Flexible spillovers refer to the spillovers that vary with industry equilibrium level of R&D. Innovating firms have incentives to cooperate in R&D in the presence of large spillovers. For any symmetric R&D profile, socially desirable equilibrium output is larger than equilibrium output produced in duopoly. Cooperative equilibrium R&D investment is observed to be socially insufficient in terms of welfare criterion irrespective of the magnitude of spillovers. While noncooperative R&D yields socially excessive expenditure on research project for a certain range of spillovers.