본 논문에서는 시간지연이 있는 경우에도 안정적으로 동작할 수 있는 텔레오퍼레이션 시스템을 설계하고자 한다. 텔레오퍼레이션 시스템은 마스터와 슬래이브 장치 그리고 통신채널로 구성한다. 안정적으로 전체 털레오퍼레이션 시스템이 동작하기 위해서는 장치들의 안정성뿐만 아니라 통신채널의 안정성도 보장해야 한다. 즉 통신채널 상의 시간지연 문제를 해결해야 한다. 시간지연은 원격제어시스템상에서 필수적으로 발생하며 이는 시스템을 불안정하게 할 수 있기 때문이다. 따라서 본 논문에서는 수동성 기반의 파동변수 알고리즘을 적용하여 텔레오퍼레이션 시스템을 설계하였다. 파동변수는 에너지 측면에 기반을 둔 방법으로 불안정성으로 인해 발생한 에너지를 강제로 소비하여 전체 시스템의 안정성을 도모하는 방법이다. 간단한 마스터와 슬래이브 장치 그리고 무선시리얼기반의 통신채널을 이용하여 텔레오퍼레이션 시스템을 구성하였으며 실험을 통해 제안한 시스템의 성능을 검증하였다.
원전에서 원자로트립 이후의 사건진단은 발전소 안전성에 매우 중요하지만 현재의 인적신뢰도 분석에서는 발전소 안전성에 대한 진단실패의 영향을 적절하게 평가하고 있지 않다. 본 논문에서는 모의실험을 통해 진단실패의 영향이 예상보다 매우 큰 것을 확인하였다. 원자로트립을 야기시키는 사건의 진단실패 가능성을 확인하기 위해 6개의 시나리오로 약 100회의 모의실험을 실시하였다. 진단시간과 진단오류확률을 추정하였으며 이 실험결과의 분석 결과 사건 시나리오의 대표성이나 모집단 크기의 제약을 감안 하더라도 발전소 안전성에 미치는 진단실패의 영향을 배제할 수 없음이 판명되었다.
Ferroelectric $Pb(Zr_{0.52}Ti_{0.48})O_3$ (PZT(52/48)) thick films were fabricated by the screen-Printing method on the alumina substrates, and $PbTiO_3$ (PT) Precursor solution, which prepared by sol-gel method, was spin-coated on the PZT(52/48) thick films to obtain a densification. Its structural and electrical properties of the PZT(52/48) thick films with the treatment of PT precursor solution coating were investigated. The particle size of the thick films was increased with increasing the number of coatings and the thickness of the PZT-6 (6: number of coatings) films was about $60{\mu}m$. The relative dielectric constant increased and the dielectric loss decreased with increasing the number of PT sol coatings. The relative dielectric constant and dielectric loss of the PZT-6 thick film were 475 and 2 %, respectively. The remanent polarization, coercive field and breakdown strength of the PZT-6 film were $32.6{\mu}C/cm^2$, 15 kV/cm and 60 kV/cm, respectively.
Master Jeungsan understood a general view of Pungsu but actually he used the theory of Pungsu in his own religious perspective, transcending it. The theory of Pungsu is different. But the fact that it is premised on the principle of ‘in and yang’, the five-element principle, the Book of Changes, energy thought, and To chugi piyung, etc. is generally recognized. The three important elements of Pungsu are mountain, water, and direction or man. Pungsu has formal principles such as Gallyongbeop, Jangpungbeop, Deuksubeop, Jeonghyeolbeop, Jwahyangbeop, and Hyeongukron. etc. In the late of Joseon, Jeungsan established a new traditional thought, understanding Bibopungsu, Gukdopungsu, Minganpungsu, etc. However, he reinterpreted them to be suitable to his religious ideal and let his followers understand them as well. In particular, Jeungsan overcame the previous view on earth and expressed a new perspective to enhance earth up to the level of heaven. In the perspective of the traditional world, earth is lower than heaven, but Jeungsan made it a status equal to heaven. He mentioned that in the past, the culture and history of man was influenced by earth
Lymphoepithelial cyst is a rare benign cystic tumor that is composed of a squamous epithelial cyst surrounded by lymphoid tissue, and this type of cyst is histologically similar to the branchial cleft cysts of the lateral neck. It is most often found in the head and neck and it is only rarely found in the pancreas, mediastinum and hypopharynx. Lymphoepithelial cysts of the esophagus have been described in Japan by Kataoka and Asami. We report here on a case of esophageal lymphoepithelial cyst that was removed endoscopically without serious complications.
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