• Advances in nano research
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• 제16권1호
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• pp.27-40
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• 2024

This work is the first of its kind to integrate Mindlin's theory with analytical methods in order to produce an exact solution to a specific vibration issue as well as a bending problem involving a nanoplate that is supported by a viscoelastic foundation. The plate is exposed to the simultaneous effects of a compressive load in the plate plane and a force operating perpendicular to the plane of the nanoplate. In addition, the flexoelecity effect is included into the plate. The strain gradient component is taken into consideration while calculating the plate equilibrium equation using the nonlocal theory and Hamilton's principle. The free vibration and static responses of the nanoplate seem to be both real and imaginary components because of the appearance of the viscoelastic drag coefficient of the viscoelastic foundation. This study also shows that when analyzing the mechanical response for nanostructure, taking into account the flexoelectricity effect and the influence of the nonlocal parameter, the results will be completely different from the case in which this parameter is ignored. This indicates that it is vital to take into consideration the effects of nonlocal parameters on the nanosheet structure while also taking into consideration the effect of flexoelectricity.

• 환경위생공학
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• 제22권4호
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• pp.1-9
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• 2007

A wastewater treatment plant, operating process is physico-chemical/biological activated sludge attached sand filtration, was selected to evaluate effluent quality and pollutants removal efficiencies consideration for deriving the technology-based effluent limitation for petroleum refining industry discharge. The results of influent and effluent analysis were as follows: Average effluent quality were 0.076mg/l of copper, 0.084mg/l of lead, 0.036mg/l of zinc, 0.005mg/l of nickel and 0.004mg/l of cadmium, and the range of coefficient of reliability from 0.007 of copper to 1.0 of lead. Also, 95% of reliability, 0.112, 0.15, 0.063, 0.015 and 0.009mg/l, respectively, were remarkably lower than their effluent limitations. And to reach 95% reliability of effluent limitation at cleanness area, designed effluent quality of copper, lead, zinc and cadmium should be 0.268, 0.099, 0.526 and 0.008mg/l, respectively.

• 환경영향평가
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• 제11권3호
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• pp.205-221
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• 2002

Environmental impact assessment (EIA) is a tool used in planning development strategies and projects, and its use has been adopted into planning regulations in a number of countries. EIA has progressed from the consideration of pollution assessment, through the wider range of ecological assessment. Now EIA is required to consider the textbook of university students. Students taking lesson on EIA textbook are generally majoring in a variety of subjects, including environmental engineering, environmental health, environmental science, city planning, civil engineering, public policy, economics, and applied earth sciences. However, substantiality program of teaching material on EIA textbook has not been studied at expert society in the meantime, though a number of EIA textbook have been published every year in Korea. In current study, we presented the point at issue and improvement method of teaching material of EIA for student using domestic and foreign teaching materials and papers.

• 한국환경보건학회지
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• 제44권4호
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• pp.397-407
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• 2018

Objectives: The purpose of this study is to investigate human health risk assessment of indoor air pollutants at small-sized public-use facilities (e.g., daycare centers, hospital and elderly care facilities) that the susceptible population is mainly used. Methods: To assess indoor air quality (IAQ), the concentrations of indoor air contaminants such as HCHO, benzene, toluene, ethylbenzene, xylene, styrene, PM-10, CO, $NO_2$ and $O_3$ in air samples were measured according to the Indoor Air Quality Standard Method. By conducting the questionnaire survey, the major factors influencing IAQ were identified. Human health risk assessment was carried out in the consideration of type of use (user and worker) at 75 daycare centers, 34 hospitals and 40 elderly care facilities. Results: As a result of measurement of indoor air contaminants, the average concentration of HCHO and TVOCs in hospitals was higher than daycare centers and elderly care facilities, about 8.8 and 23.5% of hospitals were exceeded by IAQ standard. In human health risk assessment, for the user of daycare centers and elderly care facilities, the mean carcinogenic risk of HCHO inhalation was higher than acceptable value. Except for HCHO, other values were determined under acceptable risk. Similarly, for the worker of hospitals, the mean carcinogenic risk of HCHO inhalation was higher than acceptable value and other values were evaluated under acceptable risk. In contrast, the risk levels of other contaminants measured in elderly care facilities were acceptable. In the determination of factors influencing IAQ, the construction year, building type, ventilation time, and the use of air cleaner were identified. Conclusions: This study provides the information for establishing the plans of public health management of IAQ at small-sized public-use facilities that have not yet been placed under the regulation. The findings suggest the consideration of human health risk assessment results for the IAQ standards.

• 환경영향평가
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• 제4권3호
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• pp.73-86
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• 1995

This paper demonstrates Environmental Impact Assessment (EIA) has to be applied for development projects with regard to the ecological, economical and social aspects before any decisions made in the project. Korea has confronted various environmental problems during the last fifteen years, even though EIA has been enacted since 1981. The role of impact assessment in planning and policy processes should be emphasized to investigate the magnitude and intensity of the adverse influences of economic development. In the Seoul Metropolitan Region, it is necessary to apply EIA all urban projects to reduce the adverse effects of urbanization. Special attention should be given to the climatological effects throughout the urbanization process in Korea to keep the urban area energy-efficient. This study intends not only to establish basic data for national-and regional-based land-use policy in the environmental aspects, but also to provide the basic data for the possible climate model (scenarios) that may provide spatial and temporal variability by analyzing the actual climatic record. There is a noticeable impact of urbanization on the atmospheric environment in the Seoul Metropolitan Region. In this sense, the climatic aspect must be taken into consideration in the process of EIA to mitigate the well-known climatic alterations of urbanization. Moreover, the techniques of assessment should be improved by developing geo-reference data sets to build models of the global climate in response to the man-made environmental change.

• 한국실내디자인학회논문집
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• 제22권4호
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• pp.15-22
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• 2013

The domestic industry of construction is requiring an application building concept which could be one of the solution to the environment problem sand to the sustainability of development. It means that the consideration of the housing from a environmental friendly point of view is importantly necessary all things and the housing should be planned or responding to the concept of a environmental friendly planing. For this reason, the purpose of this study is to derive the design elements for the environmental friendly housing and to choose the priority element and to bring the planning guideline for the environmental friendly housing. The purpose of this study is to identify pro-environmental attitude of environment-friendly apartment residents, to examine importance of environment-friendly planning features, and to examine environment-friendly planning features according to residents' environmental perception. and now i suggest that important improvement direction by housing estates be accessed and analyzed through environmental approach, because environmentally friendly paradigm is one of the most effective and fundamental methods for developing housing estates.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.854-857
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• 2000

This paper presents the experimental results of relationship between the machinability and environmental consciousness due to cutting fluid atomization in machining process. Even though cutting fluid improves the machined part quality through the cooling and lubracating effects, its environmental impact is also increased according to the cutting fluid usage. Cutting tool wear is one of criterion for deciding the machinability. A few turning operations were performed to know the qualitative effectiveness of cutting fluid to tool wear improvement. This research can be used as a basis for environmental impact analysis on the shop floor. It can be also facilitate the optimization of cutting fluid usage in achieving a balanced consideration of productivity and environmental consciousness.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.1-9
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• 2004

Repair of concrete structures has been a focus of attention in recent years not only in Japan but also worldwide. Concrete structures have fallen short of expectations at the time of construction-they should have been perpetual and maintenance-free. However, investigation into their premature deterioration reveals the primary causes: Concrete was made using inadequate materials and/or inadequate mixture proportions due to insufficient consideration and was placed inadequately under insufficient execution control. The secondary causes include insufficient consideration at the time of construction for the environmental conditions to which the structures were to be exposed. In any event, in the current economic climate, structures cannot be demolished and rebuilt as soon as they are damaged, but instead are expected to continue to be in service as long as possible with appropriate repair or retrofitting. This paper analyzes the causes of deterioration requiring repair and introduces relevant repair techniques. At the end, the repair project of the Sanyo Shinkansen Line in which the author was involved through committee activities is reported.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 2부
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• pp.111-114
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• 2011

Korea construction industry needs to secure its competitiveness in global construction markets and to urgently find out the proper approaches in consideration of the current situation of Korean construction enterprises and environmental changes in the international market. Korea has national plan to improve the competitive level of the construction industry. Expecially, Government is trying to build the global system in construction industry. But there are no the related national competitive date. Therefore, this paper suggested national competitive indicators and development direction in construction industry. And this research has presented the competitiveness analysis of construction industry with the consideration of condition of infrastructure, transparency and technological competitiveness.

• 한국농촌건축학회논문집
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• 제1권3호
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• pp.53-64
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• 1999

This is designed to find out the relations between traditional dwelling and its ecological concepts and factors in the natural environment. This also reveals how to design the dwelling under the full consideration of eco-system and its application possibility. Now, I have a conclusion that Modern architecture application would be possible if we design buildings under full-consideration of ecological environmental elements, inheriting the characteristics of the typical architecture items through more detailed and further advanced studies in traditional architecture methods.