• Proceedings of the Korea Association of Crystal Growth Conference
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• 1997.10a
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• pp.81-85
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• 1997

철질화물 및 Mo-Si계 규화물을 합성하기 위하여 실온 메카노케미칼 공정을 적용하였다. 메카노케미칼 처리는 고에너지 유성형 볼밀장치를 사용하였고 용기는 진공배기 후 암모니아 혹은 아르곤 가스로 충전시킨 후 벌밀처리를 행하였다. 분말의 특성평가는 XRD, DTA/DSC, SEM 및 EPMA 등에 의하여 행하였다. 철질화물의 경우 실온에서 최대 23.3 at.%N의 $\varepsilon$상 질화물을 얻을 수 있었다. 또한 Mo-SirP의 경우 100시간 메카노케미칼 처리시킴으로서 MiSi$_2$규화물을 합성할 수 있었으며 얻어진 분말의 결정립은 25cm로 매우 미세한 결정립의 분말재료임이 확인되었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.175-178
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• 2003

In this paper, proposed system use real-time MPEG-2 compression, and retrieve video from the storage using efficient indexed algorithm. System survey wide military range, diffuse situation to adjacent units, and transmit images long distance.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.335-336
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• 2003

최근 가스센서는 인간의 오감 중에 후각기능을 대신하는 것으로 그 응용범위가 점차 확대되고 있다. 이러한 센서 제작 시 센서의 성능에 영향을 주는 요인 및 사용되어지는 금속산화물, 그리고 촉매물질의 종류는 무수히 많이 발견되었으며 또한 사용되고 있다. 그러나 현재까지의 센서를 개발하는 방법은 다양한 실험인자들에 대해 시행착오적 실험을 통하여 적용되고 있는 실정으로, 최적조건을 찾아내기 위해 많은 시간과 경비가 요구되고 있다. (중략)

• Proceedings of the Korean Society of Crop Science Conference
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• 1992.05a
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• pp.54-55
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• 1992

• KEPCO Journal on Electric Power and Energy
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• v.7 no.1
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• pp.179-194
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• 2021

We introduced EPRI overview and recent R&D portfolio such as Low Carbon Resource Initiative (LCRI) and electrification, and proposed how to maximize the membership value.

• Journal of the Korean Chemical Society
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• v.42 no.3
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• pp.251-265
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• 1998

Punch'ong and whiteware sherds excavated from four kilns located in Ch'unghyodong, Kwangju, Chollanamdo were analyzed for their body and glaze composition. They are classified into eight different groups by the site and layer from which they were collected. In principal component analysis of major composition, the punch'ong body separates out into several different groups. CHE2, made in early fifteenth century, has a higher aluminum and lower iron content compared to the later groups of lower grade. Whiteware body has a very high aluminum content of around 30 wt. in both soft type and hard type. Punch'ong glaze was determined to be lime type and whiteware alkali-lime type.

• The Journal of Korean Philosophical History
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• no.50
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• pp.333-361
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• 2016

The purpose of this study is to delve into reinterpretation and categorization of normative meaning of tradition. The normative meaning of tradition which plays a key role of the action-guiding power is the main source of morality. According to ecological cultural approach to diachronic transition of traditional value, traditional value leads its dynamic life: its origin, acculturation, transformation, distortion of traditional value depending upon periodic social change. It is necessary for traditional value to be reinterpreted and categorized, with a view to contributing to attribute & competency of democratic citizen in future society. The normative meaning of traditional value applicable for Korea's future society can be reinterpreted from its origin revealed in the classic. The order of discussion in this paper runs as follows. Firstly, we will investigate into dynamic change of the traditional value on the basis of the ecological cultural perspective and seek the possibility of modern reinterpretation of loyalty & filial piety as representative traditional value. Finally, we will treat the categorization and its significance of traditional value in the frame of Korean value including both western value and Korean traditional value.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.439-439
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• 2009

Nowadays, source of MEMS, USN, Hybrid parts pay attention to energy harvesting. On this paper, energy harvesting was studied using piezoelectric effect. And, piezoelectric generator was designed and fabricated. Generators were designed by FEM simulation program and generators were made by attaching cymbal type metal plates on upper and bottom sides of a disc type piezoelectric ceramic. Output AC power was rectified to DC power by full bridge circuit and converted to regular voltage power by DC-DC converter. The final output power was charged to Ni-Cd battery. Using fabricated generators, output voltages dependant on thickness of ceramic, displacement of vibration, frequency of vibration were measured.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.392-393
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• 2011

본 논문에서는 원격검침시스템의 기반기술이 되는 광대역 전력선 통신인프라에 필요한 보안요구사항을 도출하고 국내외 표준에 반영된 보안기술을 연구하였다. 전력선 통신망에서 자원의 가용성을 확보하기위해 사용자 및 기기의 인증기능과 접근 제어기능을 검토하였으며 전력선통신 표준에 반영된 보안기술은 제각기 다른 방향으로 접근하는 것을 알수있었다. 특히 한국표준에 기술된 보안은 셀단위의 동일한 키를 사용하고 칩?의 하위계층에서 58비트 DES알고리즘만으로 보안대책이 미흡하고 다른 보안솔루션이 적용이 필요한 것으로 사료 된다.

• Journal of Powder Materials
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• v.10 no.5
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• pp.310-317
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• 2003

Two-component ceramic (alumina-zirconia) composites were fabricated by a soft-solution process in which polyethylene glycol (PEG) was used as a polymeric carrier. Metal salts and PEG were dissolved in ethyl alcohol without any precipitation in 1:1 volume ratio of alumina and zirconia. In the non-aqueous system, the flammable solvent made explosive, exothermic reaction during drying process. The reaction resulted in formation of volume expanded, porous precursor powders by a vigorous decomposition of organic components in the precursor sol. The PEG content affected the grain size of sintered composites as well as the morphology of precursor powders. The difference of microstructure in sintered composite was attribute to the solubility and homogeneity of metal cations in precursor sol. At the optimum amount of the PEG polymer, the metal ions were dispersed effectively in solution and a homogeneous polymeric network was formed. It made less agglomerated particles in the precursor sol and affected on uniform grain size in sintered composite.