Jang Yong Lee

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The Ground-based Radio Navigation System (GRNS) is an alternative/backup navigation system based on time synchronized pseudolites. It has been studied for some years due to the potential vulnerability issue of satellite navigation systems (e.g., GPS or Galileo). In the framework of our study, a periodic pulsed sequence was used instead of the randomized(More)
In this paper, we discuss some conditions for LPI signals, and propose a system with multiple users requiring these LPI properties using the optimal families of polyphase sequences recently discovered by Park et. al. We discuss and prove the bound on the key space for candidates, and conclude that our system is more secure than those employing encrypted(More)
In this paper, we show that the cross-correlation of two properly chosen column sequences from the array structure of two different Sidelnikov sequences of periods q<sup>e</sup>-1 and q<sup>f</sup> - 1, where e &#x2260; f, is bounded by (e+f-1)&#x221A;q+1. From this result, we construct new sequence families by combining sequence families from the array(More)
A conjugated copolymer based on 9,9-dioctyl-fluorene and 2,3-bis(4-(hexyloxy)phenyl) quinoxaline has been synthesized by the palladium-catalyzed Suzuki coupling reaction. The synthesized polymer was soluble in common organic solvents such as chloroform, THF, and toluene and had good film properties. The polymer was analyzed by 1H-NMR spectroscopy, UV-vis(More)
We present cross-linkable precursor-type gel polymer electrolytes (GPEs) that have large ionic liquid uptake capability, can easily penetrate electrodes, have high ion conductivity, and are mechanically strong as high-performance, flexible all-solid-state supercapacitors (SC). Our polymer precursors feature a hydrophilic-hydrophobic poly(ethylene(More)
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