Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Hyun-Ho Seo"'
Publikováno v:
Acta Astronautica. 157:374-389
A Control Moment Gyro (CMG) cluster for an agile spacecraft usually suffers from a singularity problem where it does not meet a desired torque. To solve the problem, a proposed steering law consists of SR (singularity robustness) inverse and SR null
Publikováno v:
Journal of the Korean Society for Aeronautical & Space Sciences. 46:952-960
Publikováno v:
Journal of the Korean Ceramic Society. 53:511-520
Electrolyte-supported symmetric Ni-YSZ cermet electrodes of ca. 23 ㎛ were prepared by screenprinting and the impedance was measured as a function of humidity from 2% to 90% balanced in H₂ at a total flow rate of 50 sccm. The Ni felt current colle
Autor:
Ji Haeng Yu, Jong-Sook Lee, Hyun-Ho Seo, Sun-Dong Kim, Pyung-An Ahn, Sang-Kuk Woo, Eui-Chol Shin, Dang Thanh Nguyen
Publikováno v:
Solid State Ionics. 277:1-10
The impedance behavior of the archetypal Ni–YSZ/YSZ/LSM–YSZ solid oxide cells was investigated in reversible operation at different humidity conditions up to 90%. The major electrode polarizations of the full cell at 850 °C are identified with t
Publikováno v:
Solid State Ionics. 272:60-73
A high temperature van der Pauw method using a bulk disk sample was applied for a more reliable kinetic investigation in a protonic ceramic conductor, barium zirconate doped with 20 m/o yttrium. Similarly activated faster hydrogenation and slower oxy
Publikováno v:
Aerospace Science and Technology. 39:109-119
In this study, simple methods are presented to improve the agility performance of a spacecraft with four reaction wheels in the pyramid configuration. A new and simple method is proposed to determine the momentum and the torque envelopes, which are d
Autor:
Jaekook Kim, Vinod Mathew, Eui-Chol Shin, Jihyeon Gim, Jong-Sook Lee, Alok Kumar Rai, Hyun-Ho Seo, Om Parkash, K. D. Mandal
Publikováno v:
Ceramics International. 40:181-189
Effect of praseodymium (Pr 3+ ) substitution at Ca 2+ site in calcium copper titanate, CaCu 3 Ti 4 O 12 (CCTO), has been investigated. Compositions with x =0.10 and 0.20 were synthesized in the system Ca (1−3 x /2) Pr x Cu 3 Ti 4 O 12 by chemical r
Autor:
Chang Kook Hong, Jee-Hoon Kim, Suk Moon Park, Young Woo Lim, Jong-Sook Lee, Gon Seo, Sun Jung Kim, Pyung-An Ahn, Dong Jin Kim, Hyun-Ho Seo, Chang Hwan Kim, Eui-Chol Shin
Publikováno v:
Polymer. 54:999-1003
Percolating carbon conduction network is not only a long-time pursued scientific topic but also becomes more and more technologically important. Yet no established diagnostic tool is available. A simple two-wire transmission line (TL) model with symm
Autor:
Ji Haeng Yu, Hyun-Ho Seo, Sang-Kuk Woo, Eui-Chol Shin, Junichiro Mizusaki, Sun-Dong Kim, Pyung-An Ahn, Jong-Sook Lee, Jung-Mo Jo
Publikováno v:
Solid State Ionics. 232:80-96
Comprehensive modeling of the spectra of the state-of-the-art Ni–YSZ/YSZ/LSM solid oxide cells including the instrumental stray impedance allowed the systematic deconvolution of the four major polarization losses ranging over one order of impedance
Autor:
Eui-Chol Shin, Jee-Hoon Kim, Jeong-Oh Hong, Jong-Sook Lee, Dong-Kyu Shin, Hyun-Ho Seo, Pyung-An Ahn, Chang-Hoon Kim, Jung-Mo Jo, Kang-Heon Hur, Yong Kim, Ji-Young Park, Young-Hun Kim, Gye-Rok Kim
Publikováno v:
Journal of the Korean Ceramic Society. 49:475-483
High capacitance X5R MLCCs based on BaTiO₃ ceramic dielectric layers exhibit a single broad, asymmetric arc shape impedance and modulus response over the wide frequency range between 1 MHz to 0.01 Hz. Analysis according to the conventional brick-la