Investigation on the Structural, Optical, and Vibrational Properties of Lead-Free (1-$x$)Na$_{0.5}$Bi$_{0.5}$TiO$_{3-x}$BiMnO$_3$ Ceramics
Muniyandi Muneeswaran1, Dong Hun Kim2, Beon Sung Jung2, Jung Hyun Jeong2, Jae-Won Jang2, Byung Chun Choi2
1Mechanical Engineering, University of Chile, Beauchef 851, Santiago, Chile 
2Department of Physics, Pukyong National University, Busan 48513, Korea
In order to control physical properties of Na$_{0.5}$Bi$_{0.5}$TiO$_3$ (NBT) perovskites, BiMnO$_3$ (BMO) was used as additive to form the (1-$x$)NBT-$x$BMO ($x$ = 0.01, 0.02, 0.03, and 0.04) powder samples with a solid-state method. As the BMO concentration increases, the regularly shaped grains are shown and the band-gap energy decreases from 3.28 to 3.17 eV. In addition, Raman spectra measured in the range from 100 to 1000 nm for the NBT-BMO powder samples showed new phonon modes and shifts to lower frequencies, which may be attributed to the incorporation of BMO into the NBT lattice.
J. Korean Phys. Soc. 2019; 75: 229-235  https://doi.org/10.3938/jkps.75.229
Image Scanning Method for Vascular Pattern Recognition
Jihoon Choi, Heeso Noh
Department of Physics, Kookmin University, Seoul 02707, Korea
Vascular pattern is unique to individuals and impossible to counterfeit because vessels are underneath of human skin. Therefore, vascular pattern imaging has been studied for biometric identification. However, it is not easy without additional lens system due to light scattering at human dermis. We propose that the scanning method for imaging vascular pattern can give clear image without using additional lens system. According to simulation results, correlation G between scanned image and reference image confirms that our method indeed gives the high quality image of the vascular pattern. At 2 $\mu$m of scan pixel size, G is about 0.74.
J. Korean Phys. Soc. 2019; 75: 218-222  https://doi.org/10.3938/jkps.75.218
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