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Determination of Birefringence by Brillouin Spectroscopy
Chey, Tong-Chull,Lee, Suk-Mock Optical Society of Korea 1998 Current Optics and Photonics Vol.2 No.2
We have combined Brillouin scattering experiments and fucdamental optics theory to determine the birefringence of single crystals. Double refraction in anisotropic materials give rise to doublet peaks in Brillouin spectra. With the incident plane orthogonal to the optic axis, the birefrigence of the materials can be determined from one spectrum. We present the Brillouin spectra to confirm this fact for a single crystal $PbMoO_4$.
Chey, Min Ho 대한건축학회 2012 Architectural research Vol.14 No.3
An innovative multi-story Semi-Active Tuned Mass Damper (SATMD) building system is proposed to control seismic response of existing structures. The application of adding new stories as large tuned mass and semi-active (SA) resettable actuators as central features of the control scheme is derived. For the effective control of the structures, the optimal tuning parameters are considered for the large mass ratio, for which a previously proposed equation is used and the practical optimal stiffness is allocated to the actuator stiffness and rubber bearing stiffness. A two-degree-of freedom (2-DOF) model is adopted to verify the principal efficiency of the suggested structural control concept. The simulations for this study utilizes the three ground motions, from SAC project, having probability of exceedance of 50% in 50 years, 10% in 50 years, and 2% in 50 years for the Los Angeles region. 12-story moment resisting frames, which are modified as ‘12+2’ and ‘12+4’ story structures, are investigated to assess the viability and effectiveness of the system that aims to reduce the response of the buildings to earthquakes. The control ability of the SATMD scheme is compared to that of an uncontrolled and an ideal Passive Tuned Mass Damper (PTMD) building system. From the performance results of suggested ‘12+2’ and ‘12+4’ story retrofitting case studies, SATMD systems shows significant promise for application of structural control where extra stories might be added.
Metal-polymer Joining Method with Laser Structuring to Enhance Cross-tension Strength
S. Chey(최석영),J. Y. Choi(최준영),G. Y. Kim(김근영),J. Y. Kim(김지엽),J. Lee(이중혁),A. K. Han(한경원),D. H. Kim(김도회),J. Jeong(정준영),S. J. Hong(홍석주),N. R. Yoon(윤나래),J. H. Hwang(황준호),H. D. Kim(김현덕),Y. S. Gu(구윤식),J. W. C Korean Society for Precision Engineering 2023 한국정밀공학회 학술발표대회 논문집 Vol.2023 No.11