• The Journal of Internal Korean Medicine
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• v.15 no.1
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• pp.128-137
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• 1994

• Journal of Conservation Science
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• v.33 no.4
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• pp.241-254
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• 2017

The Stone Guardian and Memorial Tablets from the Muryeong Royal Tomb are composed of the same kind of plutonic igneous rocks, the so-called hornblendite. Color of the rocks show greenish gray, and both of them occurred with medium-grained granular texture. The rock-forming minerals composed mainly of amphibole and plagioclase. Magnetic susceptibility of the Stone Guardian is 0.15 to 0.63 (mean $0.42{\times}10^{-3}SI\;unit$), the King's Stone Memorial Tablet is 0.11 to 0.38 (mean $0.24{\times}10^{-3}SI\;unit$) and the Queen's Stone Memorial Tablet ranges from 0.10 to 0.33 (mean $0.18{\times}10^{-3}SI\;unit$). The rocks of the artifacts are hard to find in the Gongju area. Large scaled out crop of hornblendite is not distributed, but found in many places that the form of dike. The lithology and occurrences indicate that the artifacts are made of plutonic rock rather than dike. Reddish brown and pale brown contaminants, are also distributed on the surface of the Stone Guardian and Memorial Tablets. The reddish brown color is due to Fe oxide, and the pale brown color occurs due to the elution of Ca. The reddish brown contaminants are influenced by the internal components of the rock and oxidation of burial iron accessories. In contrast, the pale brown contaminants are considered to have flown from the carbonate materials used in the Royal Tomb, with a little added Fe oxide. Physical and chemical deterioration operate intricately in the Stone Guardian and Memorial Tablets. Physical deterioration is extremely rare and chemical deterioration is stable except for a part of the Stone Guardian and the front of the Queen Stone Memorial Tablet.

• Magazine of the Korea Concrete Institute
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• v.21 no.1
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• pp.48-54
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• 2009

• 전기의세계
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• v.43 no.5
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• pp.24-29
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• 1994

조선조 제 4대 세종(재위 1418-1450)이 재위했던 32년은 조선조 과학기술의 눈부신 발전기였다. 특히 천문 관측기와 자격루를 위시한 각종 계시기의 발명, 인쇄기술의 개선, 도량형 통일, 화포를 위시한 무기으 ㅣ개량, 측우기의 발명 등 당시로서는 첨단을 달리는 과학기술의 황금시대를 연출하였다. 소위 첨단기술의 시대라는 오늘 우리는 세종시대의 과학과 기술을 직접 재현하여 이용할 수는 없지만 당시의 과학기술의 실체와 이것의 발달을 가능하게 했던 사회적 분위기와 배경을 알아 봄으로서 그것을 타산지석으로 삼을 수는 있을 것이다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.11 no.1
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• pp.20-25
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• 2012

A Crankshaft multi grinding machine is developed for manufacturing of high precision crankshaft. The grinding head part of the developed machine should be moved precisely during grinding of work materials. In this paper, structural and modal analysis for the crankshaft multi grinding machine is carried out to check the design criteria of the machine. The analysis is carried out by FEM simulation using the commercial software. The machine is modeled by placing proper shell and solid finite elements. The results of structural and modal analysis confirmed that the structural characteristics of grinding machine and the structural safety are considered secure.

• Journal of the Korean Society for Precision Engineering
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• v.30 no.11
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• pp.1147-1151
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• 2013

A Crankshaft Multi Grinding Machine is developed for manufacturing of high precision crankshaft. The grinding head part of the developed machine should be moved precisely during grinding of work materials. In this paper, structural and modal analysis for the crankshaft multi grinding machine is carried out to check the design criteria of the machine.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.169-171
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• 2000

전자메일이 현대 정보시스템에서 가장 필수적인 도구 중 한가지라는 것은 이제 더 이상 말할 필요가 없을 정도다. 전자메일은 그것을 잘 활용함으로써 생산 효율을 몇 배로 향상시킬 수 있는 반면, 능숙하게 사용하지 못할 경우 수신인과 발신인 상호간의 커뮤니케이션을 혼란시켜 생산성을 저하시킬 위험성을 내포하고 있다. 본 논문에서는 대량의 전자메일을 가입자에게 발송해야 하는 기업환경에서 대량의 메일 전송시에 메일 서버에 걸리는 부하를 3-tier 방식을 적용하여 효율적으로 관리하는 방법에 대하여 고찰하고, 이의 구현에 대하여 논의한다.

• The Journal of the Korea Contents Association
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• v.16 no.8
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• pp.377-386
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• 2016

This study analyzed symbolically the win-win cooperation(or win-win growth) policies and laws of large and small business to Roland Barthes and Greimas's semiotics model, and suggested that the company win-win ecosystem(cooperation) and sanggeuk(competition) shoule from a mutual harmony and balance rather than being separated from eace other like yin(-) and yang(+) theory. The results of these studies, unlike the coexistence cooperation Promotion Law of large and small business is the original intent in the ecosystem of companies, there will also be acting as a regulatory rather to officials of large and small business. In this study, because it is limited to the analysis of large and small business win-win cooperation policies and laws, it must be supported in the future of the specific empirical research.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.37 no.2
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• pp.419-425
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• 2017

Managing mega construction project is a very challenging task due to its large scale and complexity. To deal with the challenge, progress measurement must be estimated reliably and effectively. Many researchers have presented progress measurement methods, but previous studies are limited to single or several types of facilities. Thus, they have difficulties to being applied to mega construction projects that covers multiple facilities. To overcome the limitations, this paper proposes a progress measurement framework considering characteristics of mega construction projects. The framework consists of four phases : development of Work Breakdown Structure, determination of weights of main facilities and sub facilities, and calculation of the integrated progress rate. To validate the proposed approach, a case study of Sejong city in Korea was performed. The results of the case study showed the applicability of the proposed framework and confirmed that it enables to reliably measure progress rate of mega construction projects.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.11a
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• pp.422-425
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• 2011

건물의 고도화, 복합화 되고 있는 현시대에 화재시의 인명안전을 위하여 피난 및 소화기술의 발전은 더욱 강조되어 재해대책의 기술의 발전이 필요하다. 또한 소방법의 개정으로 인하여 스프링클러를 비롯한 소방설비의 수요가 늘어날 것으로 전망되어진다. 그러나 기존의 소방설비는 많은 공간을 차지하게 되어 층간높이에 영향을 크게 미치는 단점을 가지고 있었다. 본 논문에서는 화재진압설비를 기존의 공조시스템과의 결합을 통해 설치비용의 감소와 함께 공간 절감을 꾀하기 위한 적절한 공조설비의 선택을 위한 연구를 진행하고자 한다.