• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.185-186
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• 2006

우리나라는 리아스식 해안으로 지형이 복잡하고, 특히 강하구에는 사주의 영향으로 선박의 통항로가 수시로 변화되고 있어, 어선들의 좌초사고가 빈번하게 발생하고 있으나, 수심이 옅고, 굴곡이 많아 등부표 등 항로표지의 설치가 불가능한 실정이므로, 이러한 지형 환경에 맞고, 비용이 저렴한 새로운 항로표지인 등주를 설치하기 위한 연구와 설치 후 효과분석을 기술한다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1045-1046
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• 2011

본 논문에서는 굴곡면 커버내에 전기회로를 구현시 그 동안 포토리소그라피 공정으로 제작된 PCB를 휴대기 등 내부 케이스에 부착하여 전기회로를 구현하였으나 본 논문에서는 PCB없이 직접 케이스인 복합 폴리머소재에 레이저조사에 의해 패턴과 무전해도금으로 전기회로를 직접구현하는 기술이다. 이러한 방법은 제안한 3단계 공정기법에 의해 가능하며, 즉 사출형 복합폴리머소재제작, 소재의 레이저조사에 의한 시드패턴 구현 및 형성시드의 무전해도금에 의한 전도성패턴구현 공정을 통하여 곡면커버의 전기회로구현이 가능하다. 이에 따라 기존의 복잡한 10 단계 이상의 포토리소그라피 공정을 레이저조사에 의한 3단계 공정으로 간소화함으로서 제품의 생산성향상, 다량장비 구입절감, 작업공간축소 및 기타 소재절감 등의 경제적 효과를 얻을 수 있다. 응용분야는 2차원 평면 전기회로 외에 3차원 곡면형상의 제품인 자동차, 휴대폰, 의료기, 센서, 오토바이 등의 커버에 직접회로 응용이 가능하다. 이에 대한 타당성은 실험결과를 통하여 입증하였다.

• Elastomers and Composites
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• v.46 no.2
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• pp.125-131
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• 2011

The effects of chopped kenaf fiber concentration on mechanical property of polypropylene (PP) composite are investigated. The addition of kenaf increased the tensile strength, flexural modulus, impact strength, specific gravity, and HDT, while decreased the elongation%, flexural strength, and melt flow index. The increase of mechanical properties is due to increased surface area contacting between fiber and polymer matrix and fiber-fiber interaction. Volatile extractives in the kenaf seemed to decrease the interfacial adhesion between kenaf surface and PP.

• Journal of Korean Tunnelling and Underground Space Association
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• v.3 no.1
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• pp.11-19
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• 2001

The purpose of this study is to improve the problems in Umbrella Arch Method, such as the oxidation, the difficulties in installation and cutting of the steel pipe. The applicability of the high strength FRP (Fiber-Reinforced-Plastic) materials composed of glass fiber as a substitute of steel pipe was investigated in this study. The results of this study show that FRP material is better than steel pipe in work performance and the durability of material except for its price. From the numerical analysis with various types of FRP, it was evaluated that the equiangular curve type is more efficient than the flat type developed abroad, and the supporting effect of FRP-grout mixture is similar to that of steel-grout mixture in results of bending strength test.

• The Journal of Churna Manual Medicine for Spine and Nerves
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• v.1 no.2
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• pp.73-80
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• 2006

This study is designed to evaluate the effect of flexion-distraction technique for the patient with thoracic & lumbar disc and scoliosis. After flexion-distraction technique the. results of VAS of lumbago, orthopedics tests, cobb's angle were improved significantly. It is suggested that flexion-distraction technique might be effective for the patient with Thoracic & Lumbar Disc and Scoliosis.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.853-856
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• 2004

This study presents a prediction method for sound insulation of sandwich plate which consists of orthotropic plates as skin and mineral wool as core. Prediction by classic theory, which considers orthotropic effects, requires considerably complex and cumbersome process and moreover many assumption. However, experimental results of the sandwich plate with orthotropic plates as skin show that the orthotropic effects are disappeared or fade out. Hence, predictions by using sandwich model are conducted by a simple modelling that substitutes an orthotropic plate into an equivalent flat plate. Comparative results show that sandwich model gives a good agreements with theoretical prediction.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.12
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• pp.5677-5683
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• 2011

The purpose of this study was to determine the effects of hip flexion angles and Kinesio-taping on lumbar extension strength. Forty healthy participants(male=20, female=20) were volunteered for this study. It was used to measure lumbar extension strength with the back strength dynamometer in five angles($0^{\circ}$, $20^{\circ}$, $40^{\circ}$, $60^{\circ}$ & $80^{\circ}$ hip flexion). It was used to estimate and compare back extension strength with independent t-test, paired t-test, correlation analysis and ANOVA. The results of this study were as follows; First, lumbar extension strength was the most achieved at $40^{\circ}$ hip flexion in male and female(p<0.05). Second, lumbar extension strength was showed a statically increase(p<0.05) in $0^{\circ}$, $20^{\circ}$, $40^{\circ}$, $60^{\circ}$ and $80^{\circ}$(except male) after appling taping. These results proposed to us the conclusion that back muscle strength was influenced by hip flexion angles and Kinesio-taping in the lifting work.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11a
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• pp.335-338
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• 2003

본 논문에서는 실시간 클레이메이션 스타일 렌더링 기법을 구현하였다. 클레이메이션의 특징은 완만한 모서리와 표면 자국 효과 그리고 색상별로 점토를 덧붙여 만들었다는 데 있다. 색상영역 별로 메쉬의 정보를 변화시키기 위하여 색상영역을 계산하여 디스플레이스먼트 맵을 생성하고 적용하였으며, 모서리 부분을 굴곡화시키고 디스플레이스먼트 맵을 적용하기 위하여 텍셀레이션을 적용하였다. 표면 자국 효과를 위하여 Perlin 노이즈 기법을 사용하여 범프 맵을 생성하고 적용하였다. 다른 비사실적 렌더링 기법과 마찬가지로 클레이메이션 스타일 렌더링 기법은 게임이나 광고 등에 적용가능하다.

• Journal of the Korean Magnetics Society
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• v.4 no.2
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• pp.168-172
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• 1994

This paper reports a method measuring magnetostriction, Young's moduli of a substrate and film and ${\Delta}\;E$-effect with one apparatus. A substrate deposited with a thin magnetic film is parallely cantilevered paraIled to a metal plate electrode, forming a capacitive cell. The cantilever deflects due to own weight, applied electric and magnetic filed. The smaIl change of the capacitance caused by this deflection is measured by a sensitive capaci-tance bridge. Young's modulus, magnetostriction and ${\Delta}\;E$ effect can be calculated by theoretical analysis with the weight, applied field and deflection data.

• Polymer(Korea)
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• v.37 no.1
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• pp.113-120
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• 2013

The melt intercalation to commercialize nanocomposites in a pilot scale was applied and the water absorption characteristics for polyamide/MMT nanocomposites manufactured by twin screw extruder was studied. As a result, water absorption decreased with the introduction of MMT and dimensional stability was improved. However, as water absorption increased, flexural strength and modulus were reduced. Therefore, the effect of MMT introduction on mechanical properties of nanocomposites was clearly observed, which may increase the level of strength by maintaining anti-water absorption property of nanocomposite.