• 지질공학
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• 제30권2호
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• pp.119-129
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• 2020

Sand dam is a successful water harvesting method in mountainous areas with ephemeral rivers. The success is dependent on several factors including material type, hydrogeology, slope, riverbed thickness, groundwater recharge, and streamflow. In this study, the effect of a sand dam on the groundwater level in the Chuncheon area, South Korea was assessed using the MODFLOW model. Using the model, multiple scenarios were tested to understand the groundwater head before and after the construction of the sand dam. The effect of groundwater abstraction before and after sand dam construction and the sand material type were also assessed. The results show, the groundwater level increases substantially after the application of a sand dam. The comparison of model outputs, simulated groundwater head before and after sand dam application with and without pumping well, shows a clear difference in the head. The material type has also an effect on the groundwater head. As the conductivity of the material increases, the head showed a significant rise.

• 한국결정학회지
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• 제16권1호
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• pp.11-20
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• 2005

Two-dimensional lattice에 존재하는 6가지 기본대칭과 5개의 Bravais lattice를 유도하였고 10개의 two-dimensional point groups를 5개의 각 Bravais lattice에 따라 분류하였다. 마지막으로 10개 point groups에 속한 17 two-dimensional space groups를 고찰하였다.

• 대한안전경영과학회지
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• 제9권3호
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• pp.85-93
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• 2007

The purpose of this study is to examine the actual condition of environment conscious logistics system which is essential to make material recycling economic society. Environment conscious logistics management which means simple recycling tends to promote material reduction, reuse and recycling. We have made some case studies about advanced environment conscious logistics system. To examine Korean companies,' environment-conscious logistics practices we made a survey form which contains 81 questions and asked companies to respond. Thus we have the analysis from the survey responses. As a result of this study, we propose the way of constructing environment conscious logistics system in Korea.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2007년도 춘계학술대회
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• pp.81-95
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• 2007

The purpose of this study is to examine the actual condition of environment conscious logistics system which is essential to make material recycling economic society. Environment conscious logistics management which meant simply recycle is tend to promote material reduction, reuse and recycling. We have made case studies about advanced environment conscious logistics system. To examine korean companies' environment conscious logistics system, we made survey form which is consist of 81 questionnaires in Korea between 2003 and 2005. And we have analyzed the survey responses. As a result of this study, we propose the way of constructing environment conscious logistics system in Korea.

• KIEAE Journal
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• 제9권3호
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• pp.29-36
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• 2009

Interior material covering as the final process of house-building, critically influences not only aesthetic character but also air quality of indoor space. Wall covering today, however, caused a serious social problem because of chemicals contained in the industrial wallpaper and artificial glue. In this context, Korean traditional wall covering of Han-ji can be an alternative model due to it's ecological character. Recently 'Hanok' attracts public attention, since society and people become to appreciate the unique beauty and value of our traditional culture. The values include natural beauty, emotional character, and environment-friendliness. Recognizing this, this paper intended to scrutinize the operating process of Han-ji as an interior finish material. Historical research method was employed, tracing the related articles in old literature and interviewing with the witness of the experienced expert. Thereby, healthier and unique aesthetic indoor environment can be expected to be sustainable along with the rich cultural life of ancestors.

• 복식문화연구
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• 제7권1호
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• pp.13-26
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• 1999

The purpose of this study was to identify the origin of diversity of costume material caused by environmental difference. For this purpose, this research involved theoretical studies and studies based on historical data obtained from previous related studies. The common truth was proved that environmental including the geographical distribution of plants and animals determines costume material. Also, It was found that the unique traditional costume styles were developed through unique combination of costume material and their culture. The major results of this study are as follow : 1. The traditional costume of North American Indian was well-developed and closely related to geographical distribution of plants and animals. Also, their costume was so diverse that it could not be categorized. 2. The traditional costume of North American Indian showed ideal har mony between nature and human being surrounding environment into their costume. 3. The application of plants and animal materials into their costume was one of the environment-friendly human activity and it seems to give us an important message.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.1555-1558
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• 2008

In this paper, result of whole test, When the Transfer Distance is increasing, Strength of Backfilling Material of NATM Composite lining Tunnel due to increasing Gravity was increased, but that is higher the Air Flotation than increasing Strength. So, That was predicted a drop of Permeability. And Performing the placing Lightweight Foamed Mortar, we think that it's performance in drain material was lost. Therefore We conclude that Proper Transfer Distance that taking Permeability through minimizing of Air Flotation Loss and getting the Need Strength is 50m.

• 한국생산제조학회지
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• 제21권1호
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• pp.7-14
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• 2012

CFRP composite material has the superior specific strength and rigidity compared to metallic materials, and is widely adopted in the various fields. However, CFRP composite material has the weakness in hygrothermal and crash environment. Especially, moisture ingress into composite material under hygrothermal environment can change molecule arrangement and chemical properties. In addition, interface characteristics and material component properties can be degraded. A collapse experiment has been made to research the differences of absorbed energy and deformation mode between absorbed specimens of moisture and non-moisture. As a result of this study, the effect of moisture absorption and impact loads of about 30~50% reduction in strength are shown.

• Steel and Composite Structures
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• 제11권4호
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• pp.341-358
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• 2011

This paper presents the effects of thermal environment and temperature-dependence of the material properties on axisymmetric bending of functionally graded (FG) circular and annular plates. The material properties are assumed to be temperature-dependent and graded in the thickness direction. In order to accurately evaluate the effect of thermal environment, the initial thermal stresses are obtained by solving the thermoelastic equilibrium equations. Governing equations and the related boundary conditions, which include the effects of initial thermal stresses, are derived using the virtual work principle based on the elasticity theory. The differential quadrature method (DQM) as an efficient and robust numerical tool is used to obtain the initial thermal stresses and response of the plate. Comparison studies with some available results for FG plates are performed. The influences of temperature rise, temperature-dependence of material properties, material graded index and different geometrical parameters are carried out.

• Composites Research
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• 제36권3호
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• pp.193-198
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• 2023

선박 경량화와 관련하여 기존 복합재료 및 3D 프린트 복합재료를 적용하는 연구가 활발히 진행되고 있다. 염수 환경에 대한 내부식성과 경량화 특성이 있는 복합재료와 우수한 생산성을 가지는 3D 프린팅 기술을 연계한 3D 프린트 복합재료의 선박 및 해양구조물 적용 가능성을 확인하기 위해 시험을 진행하였다. 본 논문에 사용된 3D 프린트 복합재료를 선박 및 해양구조물에 적용하기 위해서는 해양환경에서 노출될 수 있는 온도 환경 영향을 고려해야 한다. 따라서 해양 환경에서 노출될 수 있는 온도인 저온(-50℃), 상온(20℃), 고온(50℃) 환경에서 Carbon + Onyx, Carbon + Nylon, HSHT glass + Onyx, HSHT glass + Nylon 소재의 시편으로 인장시험을 진행하였다. 인장시험 결과, Carbon + onyx 시편이 가장 높은 인장강도를 보였고 HSHT glass + onyx 시편이 가장 높은 인장 변형률을 보였다. 또한 인장 시험 결과 시편을 분석하여 다양한 온도 환경에 노출된 3D 프린트 복합재료 시편의 파손 형상에 대해 분석하였다.