• Electrical & Electronic Materials
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• v.10 no.2
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• pp.119-125
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• 1997

In this study, piezoelectric transducers were designed and manufactured using PZT-5A which had relatively high electromechanical coefficient, nondestructive testing system was developed which was able to inspect automatically using stepping motors, PC-Lab, and PC-Scope. The optimum design conditions for NDT were presented and verified comparing PZT-5A probes with comercial probes. It was proved by simulation and experiments that Epoxy is a good material as matching and backing layers. The envelope was reduced 60% with matching layer and 76% with matching and backing layer. NDT was successfully carried out for aluminum test pieces. Distance error of PZT-5A probe was 2.8%.

• Journal of the Korean Home Economics Association
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• v.38 no.12
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• pp.101-110
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• 2000

The purpose of this study were to investigate the influences of fashion leadership on consumers'evaluation of domestic and imported perfume product, and perfume purchasing behaviors and to find out the demographics and consumer value on fashion leadership. The data were collected from 369 female college students using questionnaire. The results were as follows: First, there were significant differences on consumers'evaluation of domestic and imported perfume product between the groups on fashion leadership. The higher the fashion leadership, the much positive consumers'evaluation of imported perfume product. Second, Fashion leaders'the frequency of perfume usage and the pieces of perfume product were higher than fashion followers. The most important perfume attribute of all groups was scent, and fashion leader took the much significant view of brand name than fashion followers. Third, Fashion leaders'economical level and pleasure oriented value was higher than fashion followers.

• Structural Engineering and Mechanics
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• v.51 no.5
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• pp.823-845
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• 2014

Success in the excavation of foundations is commonly known as being very important in asserting stability. Furthermore, when the subjected formation is rocky and the use of explores is required, the demands of successful blasting are multiplied. The quick and correct estimation of excavation's characteristics may help the design of building structures, increasing their safety. The present paper proposes a new classification system which connects blastability and rock mass quality. This new system primarily concerns poor and friable rock mass, heavily broken with mixture of angular and rounded rock pieces. However, it should concern medium and good quality rock mass. The Blastability Quality System (BQS) can be an easy and widely - used tool as it is a quick calculator for blastability index (BI) and rock mass quality. Taking into account the research calculations and the parameters of BQS, what has been at question in this paper is the effect of BI magnitude on a geological structure.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.1
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• pp.39-45
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• 2006

본 연구는 웹기반 3차원 패션몰 구축에서 의류에 대한 정보를 보다 세부적이고 전문적인 정보로 제공하기 위하여 의상 정보를 2차원 재단 패턴의 피스(piece) 정보로 구분한다. 구분된 피스는 의상에 따라 상하종속관계에 해당하는 피스정보별 상세정보를 가중치에 따라 검색하여 SVG(Scalable Vector Graphics) 파일 형태로 제공하도록 설계하였다. 이러한 의상 상세정보를 통해 디자이너가 의상구조의 다양한 조합으로 새로운 제품 디자인이 용이해지고 유사한 형태의 의상 표현이 가능해진다. 이를 통해 패션몰 상품에 대한 전문가적인 의상 분석도 가능해진다. 또한 SVG 형식의 파일을 이용하기 때문에 부하가 많은 쇼핑몰의 정보 표현에도 용이하다. 이를 위해 구축된 정보는 XML로 표준화 할 수 있도록 DTD(Document Type Definition)를 정의하여 검색 시스템을 설계하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.2
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• pp.835-840
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• 2011

In this study, a disk-type piezoelectric transformer was fabricated. Its diameter was 50 mm and thickness was 4.5 mm. The driving and generating electrode with their gap of 1mm were fabricated on the top surface. But the common electrode was fabricated on the whole bottom surface. The electrode surface of driving and generating part on the top surface was divided into 2, 4 and 8 pieces. The electrical characteristics with its electrode variation was measured in the range of load resistance of $100{\Omega}{\sim}10_{K\Omega}$. We investigated quantitively the influence of the set-up voltage ratio.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.53 no.8
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• pp.472-476
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• 2004

Standby power is the electricity consumed in an electrical equipment when it is switched-off or not performing its main function. Due to the acceleration of digital electronics and home networking, standby power use tends to increase rapidly year by year. In this paper, standby power consumption in residential sector in Korea has been surveyed and reported for the first time. Totally 825 pieces of electrical equipments that consume standby power in 53 households were investigated. The average standby power per equipment and total standby power per household were 3.66W and 57.0W, respectively. Annual standby power consumption per household was estimated 306kWh; which means the standby power consumption in residential sector in Korea can be estimated 4.6TWh a year representing 1.67 percent of total electrical consumption (274TWh).

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.52 no.12
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• pp.586-591
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• 2003

We have developed the radio frequency excited slab waveguide $CO_2$ laser, The dimension of active area is $2{\times}40{\times}400$ mm to get a laser gain. Two pieces of concave mirror are used to make the unstable resonator of negative branch. The radio frequency is 123 MHz and RF input power is from 100 to 900 W. The laser gas is set to a pressure of 10 ∼ 60 torr and the mixing ration is $CO_2$:$N_2$:He=1:1:3. The laser output power of 50.9 W was obtained with laser power to RF power efficiency of 6.5 %.

• Proceedings of the KIEE Conference
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• summer
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• pp.1531-1533
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• 2004

Standby power is progressively important in the developed countries including Korea. The status of standby power of korean home electronic wares has been unknown. In this paper, standby power consumption of home electronics in Korea has been firstly surveyed and reported. Over 800 pieces of electrical equipments that consume standby power in 53 households were investigated. The average standby power per equipment and total standby power per household were 3.66W and 57.0W, respectively. It was revealed that Audio systems and network appliances such as xDSL modem, set-top box generally consume high standby power.

• Journal of Powder Materials
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• v.15 no.2
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• pp.142-147
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• 2008

The hypereutectic Al-20 wt%Si powders including some amount of Cu, Fe, Mg, Mn were prepared by a gas atomization process. In order to get highly densified Al-Si bulk specimens, the as-atomized and sieved powders were extruded at $500^{\circ}C$, Microstructure and tensile properties of the extruded Al-Si alloys were investigated in this study. Relative density of the extruded samples was over 98%. Ultimate tensile strength (UTS) in stress-strain curves of the extruded powders increased after T6 heat treatments. Elongation of the samples was also increased from 1.4% to 3.2%. The fracture surfaces of the tested pieces showed a fine microstructure and the average grain size was about $1{\mu}m$.

• Journal of the Korea Furniture Society
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• v.17 no.4
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• pp.27-48
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• 2006

Most of us spend the greater part of our lives in the kitchen, but of all the man environments it maybe the least well-explored share commitment to a cleaner and healthier environment. It has long been kitchen system belief that the environment is a precious gift. In case of built in kitchen system, because it depend upon the earth's resources to design and manufacture steel hardware products, human beings feel an abiding responsibility to act wisely in the environmental choices we make, large and small, every day. Built in kitchen system, designed and coordinated by study of designer, represents an open, complete, free and 'focused' way of conceiving, furnishing and organizing one's own kitchen. A space rich in technical values and home warmth, where few, simple and carefully designed components distinguish and characterize the various work spaces, from the area, intended for preparing and washing food, to the cooking area, and to a wide range of multivalent pieces of furniture, wood paneled wall units and shelves.