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하태균,안병남,이득진,김진곤,정석민,Ha, T.,Ahn, B.,Lee, D.,Kim, J.,Chung, S. 한국진공학회 2006 Applied Science and Convergence Technology Vol.15 No.5
벌집형 양극 셀 구조를 가지는 스퍼터 이온펌프를 제작하여 그 성능을 측정하고 기존의 원통형 구조와 비교하였다. 원통형 구조는 원통과 원통 사이에 기체의 이온화에 크게 기여하지 못하는 공간(dead space)이 전체의 10 % 정도 존재하는데, 벌집형 구조에서는 이러한 공간이 없으므로 이론적으로는 배기성능 또한 최대 10 % 정도 향상될 것으로 예측된다. 이러한 점에 착안하여 본 연구에서는 원통형 및 벌집형 셀 구조의 스퍼터 이온펌프를 제작하여 배기성능을 측정하여 서로 비교하였다. 그 결과 벌집형 구조가 원통형 구조에 비해 압력 구간에 따라서 $5%{\sim}11%$ 정도 배기속도가 높은 것으로 나타났다. We measured pumping speed of a sputter ion pump with a honeycomb anode cell structure and compared the result with that of another sputter ion pump with a typical cylindrical anode cell structure. A cell module with a honeycomb structure has no dead space which is about 10 % of the entire horizontal area of the cell module with a cylindrical structure. This dead space makes a little contribution to the ionization of the gas, so the pumping performance of the pump with dead space is expected to be lowered by the amount. From the experimental data we concluded that the honeycomb cell structure is superior to the cylindrical structure by $5{\sim}10%$ in performance.
하태균,장인성,추윤식,정충기 대한토목학회 2014 KSCE Journal of Civil Engineering Vol.18 No.2
The interpretation method for dilatory dissipation, showing an initial temporary increase in pore pressure, in piezocone tests inoverconsolidated clayey soils was investigated in this study. Finite difference analyses on the dissipation after cone penetration wereperformed with various ground conditions. The spatial distribution of initial excess pore pressure induced by cone penetration wasdetermined from experimental estimations through in-situ tests and laboratory physical model tests and theoretical predictions by thecavity expansion theory and critical state soil mechanics. A method to evaluate the coefficient of consolidation from dilatorydissipation results was developed through the assessment of numerical simulation results. Comparing the application results with thelaboratory-determined values, it was verified that the proposed approach provided a reliable and consistent evaluation of thecoefficient of consolidation.