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Huang, Y.L.,Chen, H.J.,Rosowsky, D.V.,Kao, Y.G. Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.10 No.1
This paper proposes a simple numerical model for use in a finite analysis (FEA) of scaffold-shoring systems. The structural model consists of a single set of multiple-story scaffolds with constraints in the out-of-plane direction at every connection joint between stories. Although this model has only two dimensions (termed the 2-D model), it is derived from the analysis of a complete scaffold-shoring system and represents the structural behavior of a complete three-dimensional system. Experimental testing of scaffolds up to three stories in height conducted in the laboratory, along with an outdoor test of a five-story scaffold system, were used to validate the 2-D model. Both failure modes and critical loads were compared. In the comparison of failure modes, the computational results agree very well with the test results. However, in the comparison of critical loads, computational results were consistently somewhat greater than test results. The decreasing trends of critical loads with number of stories in both the test and simulation results were similar. After investigations to explain the differences between the computationally and experimentally determined critical loads, it was recommended that the 2-D model be used as the numerical model in subsequent analysis. In addition, the computational critical loads were calibrated and revised in accordance with the experimental critical loads, and the revised critical loads were then used as load-carrying capacities for scaffold-shoring systems for any number of stories. Finally, a simple procedure is suggested for determining load-carrying capacities of scaffold-shoring systems of heights other than those considered in this study.
Two-stage densification of ultrafine transition alumina seeded with a-phase particulates
W.J.Wei,H.C.Kao,C.Y.Huang 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.1
Highly densified Al2O3 was prepared from a transition (mainly q-phase) Al2O3 powder doped with a-seeds. Two thermal processing steps resulted in the densification and the q- to a-phase transformation were characterized by thermomechanical analysis (TMA), porosimetry, scanning and transmission electron microscopies (SEM and TEM). The evolution of the grain growth and porosity were observed. The results showed that the first-stage densification in association with the q- to a-phase transformation could be controlled to form ultrafine and uniform microstructures, and that would benefit the second-stage densification. The additional a-seeds do not only enhance the transformation rate and give a narrower pore size, but also allow the growth of uniform a-grains to sizes ca. 60 nm. The final densification properties of two seeded samples by thermal treatments were investigated revealing the effects of the transformation in the first stage and the influence of two sintering parameters, e.g. temperature and soaking time on the sintered microstructure.
Qi, W.,Park, J.H.,Cheng, J.,Kao, Y.,Gao, X. Elsevier Science B. V., Amsterdam 2017 NONLINEAR ANALYSIS HYBRID SYSTEMS Vol.26 No.-
This paper treats the problem of anti-windup design for stochastic Markovian switching systems with mode-dependent time-varying delays and saturation nonlinearity. The anti-windup compensator is designed such that the resulting system with mode-dependent time-varying delays and saturating actuator is stochastically stable and the domain of attraction is maximized. Sufficient conditions for the corresponding problem are proposed in terms of linear matrix inequalities. Finally, an example about RLC serial circuit demonstrates the validity of the proposed results.
H. Huang,H. Jang,B.Y. Kang,B.K. Cho,C.-C. Kao,Y.-J. Liu,J.-S. Lee 한국물리학회 2018 Current Applied Physics Vol.18 No.11
The frustrated magnet has been regarded as a system that could be a promising host material for the quantum spin liquid (QSL). However, it is difficult to determine the spin configuration and the corresponding mechanism in this system, because of its geometrical frustration (i.e., crystal structure and symmetry). Herein, we systematically investigate one of the geometrically frustrated magnets, the TbB4 compound. Using resonant soft x-ray scattering (RSXS), we explored its spin configuration, as well as Tb's quadrupole. Comprehensive evaluations of the temperature and photon energy/polarization dependences of the RSXS signals reveal the mechanism of spin reorientation upon cooling down, which is the sophisticated interplay between the Tb spin and the crystal symmetry rather than its orbit (quadrupole). Our results and their implications would further shed a light on the search for possible realization of QSL.