• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.667-668
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• 2011

• 한국분말재료학회지
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• 제16권1호
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• pp.37-42
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• 2009

In this study, the feasible test for the mechanical property characterization of $BaTiO_3$ ceramics and multi-layer ceramic capacitor(MLCC) was performed with nanoindentation technique. In case of $BaTiO_3$ ceramics, hardness and elastic modulus are dependent on the densification of specimen showing the highest hardness and elastic modulus values of 12.3 GPa and 155 GPa, respectively at $1260^{\circ}C$. In case of MLCC chip, hardness of dielectric layer was lower than that of margin region. The nanoindentation method could be useful tool for the measurement of mechanical property within $BaTiO_3$ dielectric layer of very thin thickness in high capacitance MLCC.

• 한국화재소방학회논문지
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• 제18권4호
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• pp.1-15
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• 2004

한국 미국ㆍ일본 3국의 화재로 인한 재산피해 분석을 통해 아래 사항을 확인하였다. ① 3국의 화재로 인한 재산피해통계 중 우리나라의 통계가 가장 구체적이지 않으며, 우리나라의 통계는 화재로 인한 재산피해의 실태를 정확히 분석하는데 많은 한계를 안고 있다. ② GDP에서 화재로 인한 재산피해가 차지하는 비율은 미국과 일본은 감소추세에 있으나 우리나라는 증가추세에 있으며 1994년도부터는 미국ㆍ일본과 지의 같은 비율을 차지하고 있다. ③ 인플레이션(소비자물가지수 기준)을 고려한 경우, 화재로 인한 재산피해는 일본과 미국은 감소하고 있으나 우리나라는 최근 2년을 제외하고는 증가추세에 있었다.

• 한국정보통신학회논문지
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• 제15권6호
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• pp.1397-1403
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• 2011

본 논문에서는 W-Band(75 GHz~110 GHz) 주파수 대역에서 전파특성 분석을 위한 샘플홀더 제작을 위하여 수행되었다. 먼저 도파관 내에서 전파의 전파이론을 정립하고 재료정수 측정기법을 도출하였다. 그리고 밀리미터파 W-band에 알맞은 도파관형 샘플홀더를 설계 및 제작하고 RAM 샘플을 이용하여 재료정수 및 전파흡수능을 측정하여 분석하였다. 분석결과 샘플시료 특성을 정확하게 측정할 수 있음을 확인하였으며, 향후 이 측정 샘플홀더는 W-band 대역 전파특성 분석을 위해 매우 유용하게 쓰일 수 있을 것이다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1190-1193
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• 2004

The purpose of this study is to evaluate the possibility of identifying joint damping property through commercially available isokinetic ergometer (BIODEX). The proposed method is to estimate the damping torque of the knee joint from the difference between the external joint torque for maintaining isokinetic movement and the gravity torque of the lower leg. The damping torque was estimated at various joint angular velocities, from which the damping property would be derived. Measurement setup was composed of the BIODEX system with an external force sensor and Labview system. Matlab was used in the analysis of the damping property. The experimental result showed that the small variation in angular velocity due to acceleration and deceleration of the crank arm resulted in greater change of inertial torque than the damping torque, so that the estimation of damping property from the isokinetic movement is difficult.

• 한국정보통신학회논문지
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• 제6권6호
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• pp.805-811
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• 2002

정보통신기술이 발달함에 따라 무선 전자상거래가 활성화되고 있으나 이에 대한 정보가 논문, 보고서 등의 자료로 한정되고 있다. 그러나 최근 들어 전자상거래에 있어서 지적재산권의 중요성이 강조되는 시점에서 이에 대한 연구의 필요성이 크게 대두되고 있다. 이에 본 논문에서는 무선 전자상거래와 관련된 기술 동향 및 이에 관련된 지적재산권에 대해 분석하여 국내의 무선 전자상거래에 관련된 지적재산권 확보 방안 및 지적재산권에 대한 대응 방안을 도출하여 차세대 표준에서 지적재산권 확보를 위한 방향을 제시한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.535-536
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• 2006

Researches about micro technology travel lively in these days. Such many researches are concentrated in the field of materials and a process field. But properties of micro materials should be known to give results of research developed into still more. In these various material properties, reliability data such as mechanical, optical, thermal property, etc is the basic property. In this paper, it is measured that is material properties of main BLU(Back Light Unit) components in LCD(Liquid Crystal Display). The pattern shape of prism sheet, diffuser film and reflective plate are measured by variable 3D scanning equipments. It is researched which is the method to measure an optimal 3D pattern shape in each components.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2008년도 춘계학술논문발표회 논문집
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• pp.242-246
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• 2008

The culture property which is designated with the domestic national treasure and the treasure does not manage protection or preservation as value of culture property of national form. South Gate which is a national treasure class culture property (Soong le) put on the large calamity which is lost with this fire. This thesis intends to understand the aspects of security danger from the research on actual condition of safety supervision department in cultural properties of Korea and propose security plans against disasters to cultural properties through the comparative study with Japan which is advanced nation of culture property prevention of disaster.

• Transactions on Electrical and Electronic Materials
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• 제10권1호
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• pp.9-15
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• 2009

There is a growing demand for a high voltage silicone rubber composite with high mechanical property and high electrical property. The effect of modified cross-linking agent on the mechanical, electrical properties, and short-circuit test performance of silicone rubber insulators have been investigated. To use base polymer, the various silicone polymers were prepared by the equilibrium polymerization. Aluminum trihydrate surface was treated by vinyl silane. Liquid silicone rubber nanocomposite was prepared from the compounding of VPMPS, HPDMS, catalyst, and alumina trihydrate modified with 1,3,5-trivinyl-l,3,5-trimethylcyclotrisiloxane. The mechanical property and electrical property for insulation materials were measured, indicating the high tensile strength and the good short-circuit property.

• 한국전산유체공학회지
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• 제12권4호
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• pp.74-84
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• 2007

The flowfield characteristics in a straight rectangular channel have been investigated through a numerical model to analyze the regenerative cooling system that is used in rocket engine cooling. The supercritical hydrogen coolant introduces strong property variations that have a major influence on the developing flow and heat transfer characteristics. Of particular interest is the improved understanding of the physical characteristics of such flows through parametric studies. The approach used is a numerical solution of the full Navier-Stokes equations in the three dimensional form including the arbitrary equation of state and property variations. The present study compares constant and variable property solutions for both laminar and turbulent flow. For laminar flow, the variation of aspect ratio is examined, while for turbulent flow, the effects of variation of channel length and Reynolds number are discussed.