• 제목/요약/키워드: Permebility

검색결과 4건 처리시간 0.015초

선형구조방정식을 이용한 의복착용쾌적감 영향요인 분석 (An Analysis of Effective Variables on Clothing Wear Comfort Using Linear Structural Equation)

  • 이은주;조정숙;이정주;최종명;조길수
    • 한국감성과학회:학술대회논문집
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    • 한국감성과학회 1997년도 한국감성과학회 연차학술대회논문집
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    • pp.47-52
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    • 1997
  • This study was carried out to investigate effects of fabric properties and the changes of microclimates on comfort sensations and to identify effective varuables on clothing wear comfort sensations. A wied range of nontreated and functionally treated woven fabrics, knits, and nonwoven fabrics and test garments made of them were used as specimens. Linear structural equation was used to analyze causal relation among the variables on a path diagram. The results were as follows: 1. Almost of causal relations among variables were significant excdpt the effects of fabric properties including air permeability and water-vapor permebility on the changes of microclimate temperature. 2. Fabric properties were most effective variables on clothing wear comfort sensations including thermal sensation, subjeceive wettedness, and overall comfort and therefore comfort sensations and fabric properties were identified for improving clothing comfort.

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분열 프랙탈을 이용한 다짐 에너지의 영향 분석 - 입도, 다짐도 및 투수특성을 중심으로 - (Analysis of Effect of Compaction Energy on Characters of Grain Size Distribution, Compaction and Permeability Using Fragmentation Fractal)

  • 노수각;손영환;장병욱;김성필
    • 한국농공학회논문집
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    • 제48권6호
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    • pp.59-67
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    • 2006
  • Particles of soil are crushed when soil is compacted in the in-situ or lab. Among many factors that affect the crush of particles, compaction energy is a major factor. Because the crush of particles can change physical properties, the analysis of effect of compaction energy is very important. In this study, the fragmentation fractals were used for determining the change in grain size distribution and the effect due to change in grain size distribution was estimated. Compaction energy was increased by 50, 100, 200 and 300% based on the energy of standard A compaction test. As a result, grain size distribution curves were changed and fine particles increased as compaction energy were increased. Relative compaction were ranged between $93.38{\sim}107.67$. Fractal dimension of each site increased as compaction energy increased. Relative compaction is proportional to the fractal dimension but coefficients of permeability were in inverse proportional to the involution of fractal dimension.

열응력이 포천화강암의 투수성에 미치는 영향 (The Effect of the Thermal Stress on the Transport Property of Pocheon Granite)

  • 윤웅균
    • 터널과지하공간
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    • 제7권3호
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    • pp.238-245
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    • 1997
  • A transient pulse methos has been used to measure the permeability of Pocheon granite pre-heated from $25^{\circ}C$ to $600^{\circ}C$ at effective pressure up to 32MPa. The permeability of whole rock ranged from 0.72 $\mu$d at 10MPa to 0.20 $\mu$d at 32MPa. The permeability of rock heated to $600^{\circ}C$ ranged from 18.07$\mu$d at 10MPa to 6.39$\mu$d at 32MPa. Confining pressure has greater effects on the rocks thermally treated to lower thermal-cycle temperatures than on the higher thermally treated rocks. The increase of permeability is most pronounced between 40$0^{\circ}C$ and $600^{\circ}C$. Below 40$0^{\circ}C$, permeability increase is expected to be associated with the formation of new cracks and widening of preexisting cracks, whereas above 40$0^{\circ}C$, permeability increase is expected to reflect widening of cracks. Using the equivalent channel model, author shows that the exponent n in the relationship relating the permebility(k) to porosity($\phi$) by k∝$$\phi$^n$ falls in the range 2.7$\leq$n$\leq$3.0.

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증기발생기 전열관의 투자율 변화신호 분리를 위한 신형 탐촉자 개발 (Development of New ECT Probe Separating the Permebility Variation Signal in the SG Tube)

  • 박덕근;유권상;이정기;손대락
    • 비파괴검사학회지
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    • 제28권1호
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    • pp.9-15
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    • 2008
  • 증기발생기 전열관에 생성되는 투자율변화에 의해 야기되는 신호왜곡 문제를 해결하기 위한 새로운 탐촉자를 개발하였다. 고리 1 호기 폐전열관에 생성된 자성상을 분리하여 자기이력곡선을 측정하였으며, 자성상이 생성되는 원인을 규명하기 위하여 고온 인장 시험을 수행하였다. 전산모사를 이용하여 탐촉자의 자정상 탐지조건을 결정하였으며, 디지털 신호전송을 위하여 신호처리용 전자회로를 소형화하여 탐촉자 속에 삽입하였다. 본 연구에서 개발된 신형 탐촉자를 이용하여 PVC 신호와 니켈 슬리빙 부위의 결함을 측정하였다. 신형 탐촉자는 보빈 탐촉자와 같이 고속으로 결함을 측정 할 수 있으며, 증기발생기 전열관의 탐상속도와 결함 탐지의 신뢰성을 증진시킬 수 있다.