• 제목/요약/키워드: environmental degree

검색결과 2,747건 처리시간 0.026초

Variation of Pull-out Resistance of Geogrid with Degree of Saturation of Soil

  • Yoo, Chungsik;ALI, TABISH
    • 한국지반신소재학회논문집
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    • 제19권1호
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    • pp.1-9
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    • 2020
  • This paper presents the results of experimental investigation on the effect of degree of saturation of soil on the pullout behavior of a geogrid. Different test variables were taken into account while performing the experiment including the soil physical conditions based on water content and external loading applied. The soil used was locally available weathered granite soil. The tests included variations in saturation of about 90%, 80%, 70% and 45% (optimum moisture content). The pullout tests were performed according to ASTM standard D 6706-01. The results indicate that increasing the degree of saturation in the soil decreases the pull-out capacity, which in turn decreases the interface friction angle and interaction coefficient. The decrease in the pullout interface coefficient was observed to be around 12.50% to 33.33% depending on the normal load and degree of saturation of the soil. The test results demonstrated the detrimental effect of increasing the degree of saturation within the reinforce soil on the pullout behavior of reinforcement, thus on the internal stability. The practical inferences of the outcomes are analyzed in detail.

임상도와 위성영상자료를 이용한 산림지역의 녹지자연도 추정기법 개발 (Development of a Methodology to Estimate the Degree of Green Naturality in Forest Area using Remote Sensor Data)

  • 이규성;윤정숙
    • 환경영향평가
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    • 제8권3호
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    • pp.77-90
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    • 1999
  • The degree of green naturality (DGN) has played a key role for maintaining the environmental quality from inappropriate developments, although the quality and effectiveness of the mapping of DGN has been under debate. In this study, spatial distribution of degree of green naturality was initially estimated from forest stand maps that were produced from the aerial photo interpretation and extensive field survey. Once the boundary of initial classes of DGN were defined, it were overlaid with normalized difference vegetation index (NDVI) data that were derived from the recently obtained Landsat Thematic Mapper data. NDVI was calculated for each pixel from the radiometrically corrected satellite image. There were no significant differences in mean values of vegetation index among the initial DGN classes. However, the satellite derived vegetation index was very effective to delineate the developed and damaged forest lands and to adjust the initial value of DGN according to the distribution of NDVI within each class.

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화강 풍화암의 지반특성 및 풍화도 평가에 대한 사례 연구 (A Case Study on Geotechnical Properties and Weathering Degree of Weathered Granite Rock)

  • 이승환;유병수;정충기
    • 한국지반공학회논문집
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    • 제33권12호
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    • pp.127-139
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    • 2017
  • 고양 지역의 화강 풍화암 지층을 대상으로 시추조사 및 다양한 현장 시추공 시험(프레셔미터시험, 공내전단시험, Downhole test, Suspension PS 검층, 밀도검층)을 수행하였고, 채취한 풍화암 코어시료에 대한 X선 형광분석을 실시하여 풍화도를 평가하였다. 현장 시추공 시험 결과로부터 변형계수, 전단강도 정수, 전단파 속도 등을 평가하였고, 심도에 따라 각 지반특성 값이 증가하는 경향을 확인하였다. X선 형광분석을 통해 산정한 화학적 풍화지수는 심도에 따라 풍화도가 감소하는 일반적인 경향을 나타냈으며, 대표적 풍화지수인 VR과 풍화암의 지반특성과의 관계를 분석하였다.

식생지수를 이용한 환경영향평가 (Environmental Impact Assessment Using Vegetation Index)

  • 한의정;김명진;이재운;김상훈;홍준석;서창완
    • 환경영향평가
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    • 제6권1호
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    • pp.47-54
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    • 1997
  • Vegetation Index(VI) derived from remote sensing data is used to assess ecosystem factor in Environmental Impact Assessment(EIA) process. Ecosystem factor has been prepared by Degree of Green Naturality(DGN) mainly in Environmental Impact Statements. But DGN has room for improvement of assessing actual ecosystem situation. The objectives of this study are to define the relationship between field measure DGN and VI, and to develop methodologies to use VI for assessing the status and conditions of natural ecosystem. For verification of DGN and VI, 35 sites using global positioning system are selected and reviewed. Correlation coefficients of DGN and VI shows highly as 0.69. Also VI in EIA found it can be applied to assess ecosystem. It concluded that VI as well as DGN can be applied to assess ecosystem newly and largescale.

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한.미.일 자동차기업의 환경경영전략에 관한 비교연구 -현대, GM, 도요타자동차 사례를 중심으로- (Comparison of Environmental Management Strategy in the Auto Company of Korea, America and Japan, -Focusing on Case Study in Hyundai, GM, Toyota Co.-)

  • 명창식
    • 경영과정보연구
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    • 제25권
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    • pp.297-319
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    • 2008
  • Dramatic increase of social concerns on the environments has led companies to take into account environmental issues in strategic decision-making. The strategic consideration on environmental management is essential to the modern companies. This study was initiated with a research purpose to explain the level and the characteristics of corporate environmental strategy through comparing the Hyundai, GM and Toyota Motor Company. The research method adopted by this research is a case analysis. The degree of environmental management strategy was evaluated in functional sectors or value chain including the production, research and development, procurement, logistic and recycling etc. Consequently, this study could find that Toyota is the most advanced company in the level of environmental management strategy. Also there are many differences among three companies in the level and degree of environmental management strategy. Hyundai and GM did not consider environmental management in foreign subsidiaries as much as Toyota. Motor Company. Also the study find out there are actual gaps between the rhetoric and reality in environmental management strategy in Hyundai Motor Co. All companies included in this study consider importantly ISO14001 as the tool to maintain the environmental management of their companies.

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오염토양의 효율적 조사기법과 측정불확도의 평가방법 (Cost-effective Investigation on Contaminated Land and Assessment of Measurement Uncertainty)

  • 이종천
    • 자원환경지질
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    • 제37권1호
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    • pp.49-59
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    • 2004
  • The concectration and distribution of contaminants obtained from a contaminated land investigation or an environmental geochemistry survey constitutes the basis of a decision-making process on environmental policies or of scientific researches. As the quality of data determines the reliability of the result, the investigation plan should be adjusted according to the purpose of the investigation. In general, the effort to improve the data quality had been focused mainly on the QA/QC procedures in laboratories. The rapid progress of analytical instrument has also contributed toward improving the analytical precision to a sacrificable degree. Nevertheless, in many cases, it is not the analytical precision that needs improvement for the better precision of overall measurement process: it is rather during the sampling process in the field that is responsible for the poor precision. To assess the data quality on a measured value, ISO recommends to provide information on "measurement uncertainty" along with the measured value. The measurement uncertainty in an environmental measurement context can be explained as the statistical number that expresses the degree of the uncertainty stemming from the sampling and analytical procedures. There is a cost involved in order to improve the precision of sampling and analytical methods so as to decrease the degree of measurement uncertainty. The economical point of compromise in an investigation planning can be achieved when the allowable degree of uncertainty has been set before-hand. The investigation can then be planned accordingly not to exceed the uncertainty limit. Furthermore, if the measurement uncertainty estimated from the preliminary investigation can be separated into sampling and analytical uncertainties, it can be used as a criterion where the resources for the investigation should be allotted cost-effectively to reinforce the weakest link of the whole investigation process. This paper aims to present a method of estimating the level of measurement uncertainty of a measured contamination concentration at a site used as an example and to show how the estimated uncertainty can be applied to serve the particular purpose of an investigation.

여성 노인입원 환자의 연령에 따른 수면장애 요인과 수면 양상 (Factors of Sleep Disturbance and Sleep Patterns According to Age in Older Hospitalized Women Patients)

  • 이혜순
    • 기본간호학회지
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    • 제18권2호
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    • pp.186-194
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    • 2011
  • Purpose: The purpose of this study was to investigate factors of sleep disturbance and sleep patterns of elderly hospitalized women patients between young-old (65-74 years), old (76-84 years) and old-old (85 years and above). Methods: The questionnaire included the environmental disturbance factors (Paik, 2000), degree of pain (Wang & Kim,1995), disease symptoms (Paik, 2000), depression (Kee, 1996) and sleep patterns (Oh, Song, & Kim, 1998). Data were analyzed using frequencies, means, ${\chi}^2$-test, t-test, ANOVA, Scheffe, Pearson correlation coefficients and multiple regression (SPSS 14.0). Results: The middle, and oldest group's environmental disturbance factors of degree of pain, disease symptoms, depression and sleep patterns were higher than those of the younger group. The younger, middle, and oldest group's sleep pattern had a significant negative correlation with environmental disturbance factors, degree of pain, disease symptoms and depression. The model including variables related to environmental, physical and psychological disturbance factors, explained the following variances in sleep pattern: 26.8% for the youngest group, 27.6% for the middle group and 40.7% for the oldest group. Conclusion: The result of this study offer basic data for the development of nursing intervention programs to improve sleep patterns for hospitalized women patients according to age differences.

성인 여성들의 스트레스와 소화불량 및 수면장애와의 관련성 (A Study on Relationship between Degree of Stress and Dyspepsia, Sleeping, Satisfaction of Adult Women in Rural Area)

  • 김영희;조수열;강복수;이경수;김석범;김상규;강영아;황영록
    • 농촌의학ㆍ지역보건
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    • 제25권1호
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    • pp.51-63
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    • 2000
  • 경상북도 고령군 동 단위를 계통적 집락 표본추출에 의해 10개 동을 선정하여, 30-69세 여성 571명을 대상으로 설문조사를 실시하였다. 1차 조사는 1999년 8월 27일부터 9월 1일까지 6일간 실시하였고 조사율은 60.3%였으며, 2차 조사는 11월에 실시하였으며 조사 완료율은 91.8%였다. 조사내용은 대상자의 인구사회학적 특성, 건강행위, 소화불량증상, 수면유도시간 및 수면만족도, 스트레스 정도 등이다. 스트레스는 Cohen이 개발한 Perceived Stress Scale을 이용하였으며, 소화불량 증상 정도의 설문은 ulcer-like 4문항, reflux-like 2문항, motility-like 4문항, non-specific 1문항으로 총 11개 문항으로 측정하였다. 수면유도 시간은 분으로, 수면만족도는 10점 척도로 측정하였다. 연령별 소화불량 정도, 수면유도시간, 수면 만족도, 스트레스 정도에서 소화불량 정도는 44점 만점에 평균 13.4점이었으며, 수면유도시간은 평균 35분이었고, 수면만족도는 평균 7.9점이었으며, 50-59세 연령군에서 소화불량 정도가 가장 높고, 수면유도시간이 가장 길고, 수면만족도는 가장 낮았다. 스트레스 정도는 평균 18.3점이었으며, 40대와 50대가 18.7점으로 가장 높았다. 수면유도시간과 수면만족도는 연령군에 따라 통계적으로 유의한 차이가 있었으나(p<0.05), 소화불량 정도와 스트레스 정도는 연령에 따라 차이가 없었다. 스트레스 정도를 3분위 구분하여 소화불량 정도, 수면유도시간, 수면만족도를 비료하여 보았을 때, 50대에서 소화불량 정도와 수면유도시간이 가장 높고 길게 나타났으며, 수면 만족도는 가장 낮았다. 또한 스트레스 3분위 군간에 통계적으로 유의한 차이가 있었다(p<0.01). 스트레스 정도와 수면만족도, 소화불량 정도간의 상관관계를 분석한 결과 스트레스와 수면만족도는 음의 상관관계가 있었고(p<0.01), 스트레스와 소화불량 정도간에는 양의 상관관계가 있었다(p<0.01). 또한 수면만족도와 소화불량 정도간에는 음의 상관관계가 있었다(p<0.01). 연령군별로 보면, 40대 이상에서 40대 미만보다 스트레스 정도와 소화불량 정도, 수면만족도간에 유의한 상관관계가 있었다. 교육수준별로는 중졸이하가 고졸이상에 비하여 스트레스 정도와 수면만족도, 소화불량과의 상관관계가 높았다. 소화불량 정도에 영향을 미치는 요인을 다중회귀분석을 이용하여 분석한 결과 스트레스 정도와 만성질환이 유의한 변수로 채택되었으며, 수면만족도에 영향을 미치는 요인을 분석한 결과 수면유도시간, 만성질환 보유 여부, 스트레스가 유의한 변수로 채택되었다. 농촌지역 성인 여성들은 50대에서 스트레스 수준이 가장 높으며, 수면 만족도는 가장 낮고, 소화불량을 많이 겪고 있는 것으로 나타나 이들 연령층에 대한 스트레스 관리가 필요한 것으로 판단되며, 또한 스트레스가 소화불량이나 수면만족도에 영향을 미치는 유의한 변수로 나타나 스트레스 관리를 통한 건강증진이 가능하다고 판단된다. 향후 스트레스에 대한 대응을 강화할 수 있는 대응자원에 대한 연구는 추가적으로 시행되어야 할 과제이며, 지역주민을 대상으로 한 스트레스 및 관련요인에 대한 연구가 시행되어 지역주민의 정신건강증진을 위한 방안들이 개발되어야 할 것이다.

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양이온성 지방산아민 벌키화제를 이용한 저밀도 종이 제조 (3) - 펄프 고해도 및 벌키화제 처리 농도에 따른 영향 - (Manufacture of Low Density Paper by Cationic Fatty Acid Amine Bulky Promotor Treatment (3) - Effect of Pulp Beating Degree and Bulky Promotor Concentration -)

  • 남윤석;최경화;김해란;조준형
    • 펄프종이기술
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    • 제48권1호
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    • pp.111-118
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    • 2016
  • The effects of pulp beating degree and bulky promotor concentration on the properties of handsheet including a bulk and strength have been investigated during manufacturing of low density paper (high bulk paper) with cationic fatty acid bulky promotor. It was found that paper bulk increased with increasing cationic fatty acid bulky agent concentration, while tensile strength decreased. On the other hand the opacity of handseets also increased with increasing cationic fatty acid bulky agent concentration, while brightness decreased slightly. With increasing pulp beating degree, paper bulk as well as tensile strength increased, while opacity decreased. Brightness did not show a significant difference with increasing pulp beating degree. The highest bulk and strength values were observed when 1.5% (SwBKP) and 2% (HwBKP) of bulky promotor was treated into the 450 mL CSF pulp slurry.

청소년의 부모폭력에 관한 연구 - 가정환경과 관련하여 - (A Study on Adolescents' Violence against Parents - With Home Environment -)

  • 전희정;지영숙
    • 대한가정학회지
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    • 제37권6호
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    • pp.123-138
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    • 1999
  • The purpose of this study was to find out whether home environmental variables had a greater effect on adolescents' violence against parents. The results of self-reporting questionnaires are as follows ; The victims of violence are mainly mothers. The socio-economic status didn't influence on the degree of violence against parents. The adolescents of the extreme family type used more serious violent behavior. The higher the degree of observed and experienced violence is, the higher the degree of violence against parents. Also, the higher the degree of home education is, the lower the degree of violence against parents. Of all variables, the observed violence and structure-environmental variables account for 37.6% of adolescents' violence against parents. The results of in-depth interview showed that birth-order didn't affect violence against parents. The victims of violence were mainly stepmothers and stepfathers. These parents' educational attitudes were disagreement in parents, seriously inflicted corporal punishment and were indifferent to adolescent. Also, interviewed adolescents were observed and experienced violence in home and used violence against others.

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