• Journal of Preventive Medicine and Public Health
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• 제38권4호
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• pp.401-407
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• 2005

Objectives : We wanted to investigate the relationship between heavy metal, especially lead and mercury, to the blood pressure and cholesterol level in children. Methods : This study was undertaken in three primary schools and the study subjects were a total of 274 children. The lead in the blood and the urine mercury were analyzed by performing atomic absorption spectroscopy. Results : All of participants' blood lead levels and urine mercury concentrations were below the suggested level of concern according to the criteria of the CDC and ATSDR. We found no significant correlation between lead, mercury and the blood pressure. The blood lead level did not show any relationship with the blood pressure and cholesterol. However, the urine mercury levels were associated with the serum cholesterol. Conclusion : Our study suggests that mercury can induce an increase of cholesterol as a risk factor of myocardial infraction and coronary/cardiovascular disease.

• 한국의류학회지
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• 제25권1호
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• pp.183-194
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• 2001

The purpose of this study are to systematize the concept on apparel store service and to provide the importance of each service according to the shopping types as well as demographic characteristics of consumers. The data was collected from 628 females and analyzed by factor analysis, reliability analysis, mean, percentage, cluster analysis, ANOVA, Duncan test, paired t-test, and t-test. The results are as follows: 1) All apparel stores consist of two categories, Products and Services. The products obviously entail whatever the store is selling. The services, on the other hand, can be broken down into three different factors of responsibility: public relations service, store environmental service, and promotional service. 2) Consumers can be classified into one of four categories: conventional type, practical type, recreational type, and casual type. 3) A recreational type and a practical type shoppers take into consideration all three service factors. The conventional and casual type shoppers, as compared to the recreational or practical type shoppers, arent really concerned with much of anything, least of the promotional service factor. 4) It has been found that the typical Korean consumer is more concerned with the public relations service factor, rather than the store environmental service factor or promotional service factor. 5) It has been found that the importance of services are significantly different in relation to the demographic characteristics, whether that be age, marital status, or the age of the youngest child.

• Environmental Engineering Research
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• 제25권3호
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• pp.439-445
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• 2020

In the estimation of the aerosol single fiber efficiency using fibrous filters, there is a size range, where the particles penetrate most effectively through the fibrous collectors, and corresponding minimum single fiber efficiency. For small particles in which the diffusion mechanism is dominant, the Cunningham slip correction factor (C_c) affects the single fiber efficiency and the most penetrating particle size (MPPS). Therefore, for accurate estimation, C_c is essential to be considered. However, many previous studies have neglected this factor because of its complexity and the associated difficulty in deriving the appropriate parameterization particularly for the MPPS. In this study, the expression for the MPPS, and the corresponding expression for the minimum single fiber efficiency are analytically derived, and the effects of C_c are determined. In order to accommodate the slip factor for all particle-size ranges, C_c is simplified and modified. Overall, the obtained analytical expression for the MPPS is in a good agreement with the exact solution.

• 한국환경과학회지
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• 제28권4호
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• pp.413-422
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• 2019

The objective of this study was to estimate the trends of air quality in the study area by analyzing monthly and seasonal concentration trends obtained from sampled data. To this aim, the mass concentrations of $PM_{2.5}$ in the air were analyzed, as well as those of metals, ions, and total carbon within the $PM_{2.5}$. The mean concentration of $PM_{2.5}$ was $22.7{\mu}g/m^3$. The mass composition of $PM_{2.5}$ was as follows: 31.1% of ionic species, 2.2% of metallic species, and 26.7% of carbonic species (EC and OC). Ionic species, especially sulfate, ammonium, and nitrate, were the most abundant in the $PM_{2.5}$ and exhibited a high correlation coefficient with the mass concentration of $PM_{2.5}$. Seasonal variations of $PM_{2.5}$ showed a similar pattern to those of ionic and metallic species, with high concentrations during winter and spring. $PM_{2.5}$ also had a high correlation with the ionic species $NO_3{^-}$ and $NH_4{^+}$. In addition, $NH_4{^+}$ was highly correlated with $NO_3{^-}$. Through factor analysis, we identified four controlling factors, and determined the pollution sources using the United States Environmental Protection Agency(U.S. EPA) pollution profile. The first factor, accounting for 19.1% of $PM_{2.5}$ was attributed to motor vehicles and heating-related sources: the second factor indicated industry-related sources and secondary particles, and the other factors indicated soil, industry-related and marine sources. However, the pollution profile used in this study may be somewhat different from the actual situation in Korea, since it was obtained from US EPA. Therefore, to more accurately estimate the pollutants present in the air, a pollution profile for Korea should be produced.

• 산업융합연구
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• 제19권6호
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• pp.155-164
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• 2021

본 연구는 다문화청소년의 개인·정서·부모·사회·환경적 요인이 진로미결정에 미치는 영향 요인을 파악하는 것을 목적으로 한다. 조사대상자는 현재 고등학교에 재학 중이며 아버지가 한국인인 다문화청소년 1,146명을 다문화청소년패널(MAPS) 7차 자료에서 추출해 다중회귀분석으로 검증했다. 연구결과는 첫째, 다문화청소년의 개인 요인인 자아존중감과 사회·환경적 요인인 학교생활적응 및 다문화 수용이 진로미결정에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 정서적 요인으로 우울증과 부모요인인 방임이 진로미결정에 부적인 영향을 미치는 것을 확인하였다. 하지만 부모-자녀 의사소통은 진로미결정에 영향을 미치지 않는 것으로 확인되었다. 이와같은 연구결과를 토대로 다문화청소년의 진로 미결정을 사전에 예방하고 진로미결정을 위한 기초자료를 제공했다는 점에서 의의가 있다.

• 환경영향평가
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• 제14권6호
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• pp.443-453
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• 2005

For the purpose of the comparative environmental estimation of the incineration processes for domestic wastes, environmental impacts for several incineration processes for one ton of domestic wastes have been estimated by employing life cycle assessment as the environmental impact assessment method. The scheme of minimum production of environmental pollutants has been considered for three different incineration processes. The evaluation for latent influence on environment was carried out by using CML(Center of Environmental Science) method which was developed by University of Leyden in Netherlands based on the equivalency factor suggested by Korea Accreditation Board. The result of life cycle assessment has showed that the total cost analysis according to the amount of incinerating waste was dependent on the operating conditions of incineration process. In addition, the annual running cost for the incineration of one ton of wastes was estimated to be negatively dependent on the amount of wastes. The degree of environmental pollution was mainly due to the kinds of the wastes rather than by the amount of wastes.

• 대한기계학회논문집A
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• 제33권10호
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• pp.1151-1157
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• 2009

Nuclear power plants applying for the continued operation over design life are required to address the effects of reactor water environment in fatigue design requirement of the ASME Code. Reactor water environmental effects are generally evaluated by calculating fatigue correction factors on fatigue usage. This paper describes the application for pressurizer surge line of environmental fatigue correction factors and the strain rate impact in the application. From this paper, the environmental fatigue correction factors resulted from the assumption of a step change in temperature are especially compared with those calculated from the data measured during plant startup. As a conclusion of this paper, the design transient conditions applied to the fatigue design may be conservative in case of the environmental fatigue evaluation.

• 품질경영학회지
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• 제27권2호
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• pp.183-200
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• 1999

ndustrial development began to cause serious pollution problems. Most of the environmental problems are related with operations of industrial companies. Environmental problems should be considered at all the stages of business activities or processes, from product design to new forms of packaging, from marketing to disposal. This paper suggests that how to cope with environmental issues is an important factor in the global market, and environmental management has become one of the key success factor. Through the survey of P&G's environmental management, it is intended to provide a chance to benchmark or give a cue on how to conduct the environmental management.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2001년도 추계학술발표회
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• pp.115-119
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• 2001

Contaminant retardation factor is derived from the colloidal and contaminant transport equations for a four-phase porous medium: an aqueous phase, two mobile colloidal phases, and a solid matrix. It is assumed that the contaminant sorption to solid matrix and colloidal particles and the colloidal deposition on solid matrix follow the linear isotherms. The behavior of the contaminant retardation factor in response to the change of model parameters is examined employing the experimental data of Magee et al. (1991) and Jenkins and Lion (1993). In the four-phase system, the contaminant retardation factor is determined by both the contaminant association with solid matrix and colloidal particles and the colloidal deposition on solid matrix. The contaminant mobility is enhanced when the affinity of contaminants to mobile colloids increases. In addition, as the affinity of colloids to solid matrix decreases, the contaminant mobility increases.

• 한국환경과학회지
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• 제7권5호
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• pp.591-598
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• 1998

This study was conducted to evaluate water quality in the Keum River estuary using principal component analysis. The results was summarized as follow; Water quality in the Keum River estuary could be explained up to 70.40% by three factors which were included in the inffluent loading by the Keum River and Kyungpo cheon(38.99%), seasonal variation and organic matter pollution(19.05%), sediment resuspension and internal metabolism(12.35%). For spatial variation of factor score, artificial pollutant loading is highest at st.1, below Keum River barrage, and decreases toward the outer sea. For annual variation of factor score, factor 1 was highly related to artificial pollutant leading, and it was gently increased in 1994. Also, organic matter pollution, sediment resuspension and internal metabolism were increased to every year. It is necessary to control the nutrient leading by Keum river and Kyongpo cheon for Water quality management of estuary.