• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2003년도 추계종합학술대회
• /
• pp.805-808
• /
• 2003

기존에 적용중인 유전가열 합성수지 접착기술의 경우 진공관 소자를 사용하여 10MHz 대역 이상의 스위칭 주파수를 사용하고, 유전손실이 비교적 높은 PVC 소재에 제한적으로 적용해 왔다. 다른 합성수지 소재에 비해서 유전손실이 낮은 친환경적인 소재에 대해서는 적용이 어려운 기술인 관계로 최근들어 부각되는 친환경적 소재의 적용 확대로 인하여 기존 유전가열 방식의 접착기술은 한계에 접하고 있다. 본 논문에서는 고주파 유도가열 관련 기술을 응용하여 친환경적인 합성소재의 직접가열의 문제점을 간접가열에 의한 온도제어를 적용하여 고주파 유도가열 접착기를 설계하였다.

• Journal of Advanced Marine Engineering and Technology
• /
• 제6권1호
• /
• pp.34-40
• /
• 1982

The characteristics of typical 17 kinds of fuel oils are studied to fine the calculation formulae for the required amount of air and the combustion gas amount. 1) The author's calculation formulae are as follows; (1) Theoretically required amount of air (2) Theoretical amount of combustion gas 2) Theoretical amount of the required air in combustion and combustion gas of fuel oils are always estimated less with Rosin's formula than with author's one. 3) Theoretical amount of the required air and the amount of combustion gas of fuel oils are more reasonable with author's formula than Rosin's one in comparison with results of actual analysis.

• 한국전기전자재료학회논문지
• /
• 제14권5호
• /
• pp.376-382
• /
• 2001

Magnetic and transport properties in the ceramic specimen of L $a_{0.7}$S $r_{0.3}$Fe $O_3$ with orthohombic structure has been investigated. Weak ferromagnetism has been observed in a ceramic sample of L $a_{0.7}$S $r_{0.3}$Fe $O_3$. Large dielectric relaxation of Debye type is observed in paramagnetic states within the temperature range of 130K~200K. From the temperature dependence of the characteristic frequency, we concluded that the elementary process of the dispersion is related to holes hopping between F $e^{3+}$ and F $e^{4+}$ ions. The temperature dependencies of thermoelectric power and Dc conductivity suggest that the charge carrier responsible for the conduction are strongly localized. These experimental results have been interpreted in terms of a hopping process involving small polaron.n.laron.n.

• 한국IT서비스학회:학술대회논문집
• /
• 한국IT서비스학회 2005년도 춘계학술대회
• /
• pp.489-494
• /
• 2005

오픈 소스 소프트웨어 사용에 대한 적극적인 관심과 정책이 지원되는 상황에서 리눅스 데스크탑 분야는 기업업무환경을 중심으로 사용이 점점 확대되고 있다. 기존 리눅스 데스크탑은 윈도우환경과 비호환 부분이 있고 윈도우대비 부족한 리눅스 기능이 있다. 따라서 윈도우 클라이언트를 위한 표준컴퓨팅환경의 요구 기능을 살펴볼 필요가 있다. 본 논문에서는 표준 컴퓨팅환경기반의 리눅스 데스크탑의 요구 기능을 제안한다. 향후, 리눅스 데스크탑은 표준 컴퓨팅환경을 고려하여 기업업무용에 적합한 사용 환경을 제공하고 일반사용자에게 시스템 설정과 부족한 응용 프로그램을 발굴하여 기존 윈도우와 유사한 환경을 지원할 것이다.

• 인문언어
• /
• 제5권
• /
• pp.93-106
• /
• 2003

Professor Daihyun Chung has recently presented an intriguing view of Ban-mal(non-honorific expressions) in Korean. He criticizes uses of Ban-mal, on the grounds that they presuppose the existence of hierarchical structures in human beings. Professor Chung also advocates ″a relational theory of Ban-mal″ according to which ascriptions of 'n-mal' should be relativized to the speaker-hearer relationship. He employs this view in showing that uses of Ban-mal indeed presuppose the existence of hierarchical structures in human beings I claim that Professor Chung has not shown the credibility of his relational theory of Ban-mal, and that this very view leads to an unintended and undesirable consequence. Moreover, 1 show that even if we assume that this view is true for the sake of an argument, he is not able to show that uses of Ban-mal indeed presuppose the existence of hierarchical structures. All he can show is rather that uses of 'Ban-mal'(a meta-linguistic expression) presuppose the existence of hierarchical structures. Finally, 1 conclude that what really presupposes the existence of hierarchical structures is the asymmetrical uses of Ban-mal and honorific expressions.

• 한국세라믹학회지
• /
• 제44권11호
• /
• pp.627-632
• /
• 2007

We have studied the ac conductivity of insulating $La_{0.7}Sr_{0.3}FeO_3$ in the frequency range 20 Hz-l MHz and in the temperature range 80-300 K. We have analyzed experimental results in the frame works of the quantum-mechanical tunneling mechanism (QMT) and the hopping of barrier mechanism (HOB). We observed that small polaron QMT model is the most suitable mechanism for the low temperature ac conductivity of $La_{0.7}Sr_{0.3}FeO_3$.

• Maxillofacial Plastic and Reconstructive Surgery
• /
• 제14권1_2호
• /
• pp.169-173
• /
• 1992

This is a report of two rare cases, that authors have experienced, one being four sialoliths within a wharton's duct, which is a relatively frequent site of sialolith, and the other a multiple occurrance of 16 sialoliths at the orifice of stensen's duct, which has very low frequency of sialolith occurance. Both pathosis were removed using transoral sialolithotomy.

• 한국재료학회지
• /
• 제18권4호
• /
• pp.175-180
• /
• 2008

In this study, the thermoelectric power and resistivity of the perovskite manganite $La_{0.75}Ba_{0.25}MnO_3$ were investigated in the temperature range 300K-1200K. The electrical resistivity and thermoelectric power indicate a transport mechanism dominated by adiabatic small-polaron hopping. The power factor increases from $2{\times}10^{-6}W/mK^2$ to $1{\times}10^{-5}W/mK^2$ as to the temperature increases from 400K to 1200K, which indicates that the compound is highly feasible as a thermoelectric material at high temperatures.

• E2M - 전기 전자와 첨단 소재
• /
• 제5권1호
• /
• pp.111-121
• /
• 1992

본 연구는 Pb( $Co_{1}$3/Nb$_{2}$3/) $O_{3}$-PbTi $O_{3}$-PbZr $O_{3}$계 압전세라믹스의 조성에 따른 착화소자특성과 기계적응력 인가시의 압전열화현상에 대하여 조사하였다. 그 결과 상경계 조성에서 소결밀도, $K_{33}$ 및 출력전압이 최고치를 나타내었으며 능방정계조성에서는 조성의 변화에 따른 소결 및 전기적특성의 변화는 정방정계조성에 비하여 작았다. 기계적 응력 인가시의 압전퇴화현상은 분역의 재배열로 설명할 수 있었다.

• 한국세라믹학회지
• /
• 제35권8호
• /
• pp.885-889
• /
• 1998

The temperature dependence of dc conductivity and magnetic properties of cation deficient {{{{ { {(LaMn) }_{1-λ }O }_{3 } }} systems has been investigated,. Above 160K the magnetic susceptibility of all samples followed the Curie-Weiss law. The Curie temperature decreased as the cation deficiency increased. This is due to a strong Jahn-Teller effect originated from electrons of {{{{ { Mn}^{3+ } }} In the case of samples annealed in air and oxygen at-mosphere the charge carriers responsible for conduction in the ferromagnetic regime below the Curie tem-perature are believed to have both magnetic and lattice characteristics. However the conduction carriers in the paramagnetic regime above the Curie temperature are though to be formed by hopping process of small polarons which were generated by assistance of the Jahn-Teller effect.