• Title, Summary, Keyword: 물리적 현저성 강도

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An empirical study on the roles of attitudes and attitude strength in stimulus-based decision-making (자극기반 의사결정과정에서 태도와 태도강도의 역할에 관한 실증연구)

  • Beom, Sang-Kyu;Song, Kyun-Suk
    • Journal of the Korean Data and Information Science Society
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    • v.20 no.3
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    • pp.563-575
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    • 2009
  • This research has found logical data directly influencing forming consideration set and attitude and attitude strength under the choosing situation based on memory-base proposed by Priester et. al (2004). We've examined the possibility of model extension through physical salient strength according to the location of product display as an external stimulate factor and attitude and attitude strength, consideration set and role on variable choice. Especially, this research practically proposed the method measuring directly the attitude on behavior instead of seeing the intension of behavior or behavior by measuring the behavior itself based on existing experiment methods and applied logistics regression analysis. In conclusion, this research confirmed the possibility of generalization of this model by verifying appropriateness through logical background and actual analysis based on stimulus-base proposed model characters as an integrated model relation between attitude in stimulus-based relation and decision-making.

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유.무기 복합 성형체의 난연특성 연구

  • 서동수;강영구
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • pp.55-60
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    • 2001
  • 1970년대 이후 석유화학공업의 발전과 더불어 플라스틱 공업도 현저하게 발전하여 6대 범용수지로 사용되고 있는 PE, PP, PS, PVC, PET, ABS등은 매년 14%이상씩 발생량이 늘어가고 있는 실정이다. 그러나, 폐플라스틱은 종류나 물리적 특성, 용도 등과 관계없이 매립 및 소각에 의해 처리되고 있어 환경오염원으로서 이들의 사용후 처리 문제가 심각한 사회문제로 대두되고 있다. 그리고 PE 및 PP는 6대 범용수지 중 65%이상의 생산 및 수요량을 가진 플라스틱이지만 난연특성 결여, 높은 화재발생빈도, 분말상일 경우 분진폭발의 위험성 등을 지니고 있어 고부가가치 용도로 사용하기 어렵다.(중략)

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Enhanced Transdermal Permeation Effects of Lidocaine Gel by Low Frequency Ultrasound (저주파수 초음파를 이용한 Lidocaine Gel의 피부투과 촉진 효과)

  • Jung, Dae-In;Lee, Jung-Woo;Ahn, Hyo-Cho;Yang, Jae-Heon;Kim, Tae-Youl;Cho, Seong-Wan;Kim, Young-Il
    • Korean Chemical Engineering Research
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    • v.46 no.2
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    • pp.217-221
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    • 2008
  • To investigate the enhancing effects in transdermal permeation of drug using newly designed ultrasound apparatus of 500 kHz, the transdermal permeation studies through the hairless mouse skin were conducted with lidocaine. The ultrasound apparatus of 500 kHz frequency and transducer were newly developed. The drug permeation studies were performed according to the ultrasound frequencies such as 1 MHz and 500 kHz at $1W/cm^2$ in intensity in continuous mode or pulsed mode, respectively. The results on transdermal permeation of lidocaine according to ultrasound intensity showed that the drug permeation increased as the intensity was higher.

An Experimental Study on the Physical Properties of Concrete Spread with Liquefied Organic and Inorganic Complex Antibiotics (액상 유·무기 복합 항균제를 도포한 콘크리트의 물리적 특성에 관한 실험적 연구)

  • Kim, Mu-Han;Kim, Jae-Hwan;Jo, Bong-Suk;Lee, Eui-Bae
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.2
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    • pp.67-75
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    • 2006
  • Recently sewage facilities mainly consisted of concrete structures are being deteriorated seriously by biodeterioration originated from sulfur-oxidizing bacteria. In this study, to prevent biochemical corrosion of the sewer concrete, antibiotics which prevent growth of sulfur-oxidizing bacteria were developed and antimicrobial performance of it was investigated. After that, to consider applicability of antibiotics to concrete, physical properties of concrete spread with antibiotics were investigated. As a results of the study, it was proved that the antimicrobial performance of antibiotics was available. Also compressive strength and bond strength of concrete didn't closely connected with antibiotics, and resistance to abrasion, water absorption and air permeability of concrete was improved remarkably by spraying with it.

An Experimental Study on the Improvement of Early Strength and Chloride Attack Resistance for Marine Concrete (해양용콘크리트의 초기강도 및 내염해 저항성 향상에 관한 실험적 연구)

  • Lee, Keon-Ho;Kim, Jong-Back;Bae, Jun-Young;Seo, Shin-Seok;Jo, Sung-Hyun;Roh, Hyeon-Seung
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.661-664
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    • 2008
  • The structure which is located in special surroundings like ocean-environment is physically and chemically eroded by seawater or salt damage, and then concrete-structure becomes deteriorated by iron corrosion and swelling pressure which leads to remarkably decline durability due to cracks and exploitation. As a measure against salt damage, it is actively being examined to use the blended cement that controls salt damage and fix chloride in the process of hydration. In this study, therefore, to examine the property of marine concrete added admixture, marine concrete is manufactured by adding high-strength admixture(omega2000) by 0, 5, 10, and 15% to low heat-blended cement. Then it shows that the compressive strength of manufactured marine cement tends to increase and chloride penetration resistance improves.

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Technical Trend of Inverse Analysis to Identify the Strength Parameters of Rock Mass in Underground Excavation (지하굴착에서 암반의 강도정수 추정을 위한 역해석 기술동향)

  • Park, Dohyun;Park, Eui-Seob
    • Journal of the Korean Society of Mineral and Energy Resources Engineers
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    • v.54 no.4
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    • pp.437-446
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    • 2017
  • Underground excavation necessarily involves geological materials whose physical properties vary in space. Because of limited site investigation in the design phase, the geotechnical behaviors of rock mass predicted in the design phase may differ from those observed during construction. In case of a significant difference, it is necessary to reexamine the adequacy of excavation design. The material properties of rock mass, which simulates the ground behavior in the field, should be improved. Inverse analysis can be used to reassess the rock mass properties based on field measurements. One of the main purposes of the inverse analysis is to ensure ground stability during construction and operation, and thus it requires an inverse analysis which evaluates the strength characteristics of rock mass. This paper introduced previous approaches for identifying the strength parameters of the surrounding rock mass and the associated optimization techniques, and also described limitations and improvements of the conventional approaches.

The Physical Properties Variation of Grout Materials and Improvement of Grouting Effects on Application of High Performance Injection Equipment (고성능 주입장비의 적용에 따른 주입재의 물성변화 및 주입효과 증진에 관한 연구)

  • 천병식;김진춘;김백영
    • Journal of the Korean Geotechnical Society
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    • v.19 no.4
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    • pp.179-190
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    • 2003
  • The grout based on solution type makes it difficult to get the improvement of ground strength and the effefct of water curtain because it has lower strength and durability than suspension type. Nowadays, the technology of particle acceleration, that enhance the material permeability, such as grout based on solution type, and inexpensive grout, is being required. For these reasons, in this study, using wet milling system, we evaluated physical properties of manufactured factors such as water-cement ratio of particles before being milled, optimum milling capacity by controlling milling time and rpm, viscosity of materials, permeation coefficient, and unconfined compressive strength. Also, using micro wet milling apparatus which could manufacture ordinary Portland cement and high speed shear mix which could forcefully separate conglomerate particles in situ, we performed electrical resistivity investigation and falling head permeability tests to analyze differences of grouting effects. From these results, we found that the permeability of the applied equipment was much superior, and in the case of using high speed shear mixer, particles of grout material were well separated.

Experimental Study on the Development and Application of High-Performance Composite Utilizing Industrial Wasts Products for Construction Works -Carbon Fiber Reinforced Fly Ash.Cement Composites- (산업폐기물을 이용한 건재용 고성능복합체의 개발 및 응용에 관한 실험적 연구 -탄소섬유 보강 플라이애쉬.시멘트 복합체-)

  • 박승범;이보성;윤의식
    • Magazine of the Korea Concrete Institute
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    • v.3 no.3
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    • pp.101-110
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    • 1991
  • Results of an experimental study on the manufacture, the mechanical properties and watertightness of pitch - based carbon fiber reinforced fly ash. cement composites are presented in this paper. The carbon fiber reinforced fly ash. cement composites using early strength cement silica powder and a small amount of stylene butadiene rubber latex are prepared with carbon fiber, foaming agents and mixing conditions. As a result, the mechanical and physical properties such as compressive , tensile and flexural strengths, watertightness and drying shrinkage of lightweight carbon fiber reinforced fly ash cement composites are Improved by using a samll amount of stylene butadiene rubber latex. Also, the manufacturing pnx:ess technology of carbon fiber reinforced fly ash . cement composItes is developed. The development and applications of precast products of lightweight carbon fiber remforced cement composites are expected in the near future.

The Effect of Mean Brightness and Contrast of Digital Image on Detection of Watermark Noise (워터 마크 잡음 탐지에 미치는 디지털 영상의 밝기와 대비의 효과)

  • Kham Keetaek;Moon Ho-Seok;Yoo Hun-Woo;Chung Chan-Sup
    • Korean Journal of Cognitive Science
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    • v.16 no.4
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    • pp.305-322
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    • 2005
  • Watermarking is a widely employed method tn protecting copyright of a digital image, the owner's unique image is embedded into the original image. Strengthened level of watermark insertion would help enhance its resilience in the process of extraction even from various distortions of transformation on the image size or resolution. However, its level, at the same time, should be moderated enough not to reach human visibility. Finding a balance between these two is crucial in watermarking. For the algorithm for watermarking, the predefined strength of a watermark, computed from the physical difference between the original and embedded images, is applied to all images uniformal. The mean brightness or contrast of the surrounding images, other than the absolute brightness of an object, could affect human sensitivity for object detection. In the present study, we examined whether the detectability for watermark noise might be attired by image statistics: mean brightness and contrast of the image. As the first step to examine their effect, we made rune fundamental images with varied brightness and control of the original image. For each fundamental image, detectability for watermark noise was measured. The results showed that the strength ot watermark node for detection increased as tile brightness and contrast of the fundamental image were increased. We have fitted the data to a regression line which can be used to estimate the strength of watermark of a given image with a certain brightness and contrast. Although we need to take other required factors into consideration in directly applying this formula to actual watermarking algorithm, an adaptive watermarking algorithm could be built on this formula with image statistics, such as brightness and contrast.

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Effects of pH Adjustment and Sodium Chloride Addition on Quality Characteristics of Surimi Using Pork Leg (pH 조절 및 소금 첨가가 돼지 뒷다리부위를 이용한 수리미의 품질특성에 미치는 영향)

  • Jin, Sang-Keun;Kim, Il-Suk;Chung, Hyun-Jung;Cho, Ju-Hyun;Choi, Yeung-Joon;Lee, Jae-Ryong
    • Food Science of Animal Resources
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    • v.27 no.1
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    • pp.35-41
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    • 2007
  • This study was conducted to determine the effect of pH adjustment and addition of sodium chloride (NaCl) on quality characteristics of pork leg surimi. The pork leg surimi was manufactured with one of following pH 3.0 or pH 11.0 adjustment and contained 2% NaCl or not; C (Alaska pollack surimi, two times washing, 0% NaCl), T1 (pork leg surimi pH 3.0 adjustment, 0% NaCl), T2 (pork leg surimi, pH 3.0 adjustment, 2% NaCl), T3 (pork leg surimi, pH 11.0 adjustment 0% NaCl), T4 (pork leg surimi, pH 11.0 adjustment, 2% NaCl). The $L^*$ and W values was increased with increasing of pH value, but the $a^*$ and $b^*$ values lower. The W values were higher (p<0.05) as addition of NaCl, but $a^*$ and $b^*$ values were lower. In textural properties, the cohesiveness was increased with increasing of pH value, however with the exception of springiness all traits were higher (p<0.05) as addition of NaCl. The breaking force and gel strength was increased with increasing of pH value. The breaking force, gel strength and breaking force u deformation were higher as addition of NaCl, but shear force lower. In sensory evaluation, the tenderness was increased with increasing of pH value and all traits of sensory evaluation also were higher (p<0.05) as addition of NaCl. There were no differences in interaction of pH adjustment and without or with NaCl on color, textural properties, breaking force, deformation, gel strength, shear force and sensory evaluation of pork leg surimi. The color, textural and physical characteristics and sensory evaluation ot T2 and T4 were similar to treatment C. Therefore, the pH 11.0 and 2% NaCl addition on process of manufacture of pork leg surimi would be recommended.