• Proceedings of the Korean Fiber Society Conference
• /
• 1988.06a
• /
• pp.23-23
• /
• 1988

• Proceedings of the Optical Society of Korea Conference
• /
• 2005.07a
• /
• pp.136-137
• /
• 2005

• Proceedings of the Optical Society of Korea Conference
• /
• 2005.07a
• /
• pp.142-143
• /
• 2005

• Polymer Science and Technology
• /
• v.2 no.6
• /
• pp.415-423
• /
• 1991

• Polymer Science and Technology
• /
• v.2 no.6
• /
• pp.424-437
• /
• 1991

• Proceedings of the Korean Fiber Society Conference
• /
• 1990.06b
• /
• pp.39-40
• /
• 1990

• Information Display
• /
• v.20 no.2
• /
• pp.28-37
• /
• 2019

• Korean Journal of Optics and Photonics
• /
• v.19 no.1
• /
• pp.48-53
• /
• 2008

We propose an optical configuration to compensate dispersion characteristics in the dark state of normally black twisted nematic (NB-TN) liquid crystal display (LCD). We employed a half-wave plate (HWP) and a +A plate to achieve the superior dark state. By using the parameter space diagram (PSD) method, we could obtain the optimum values of parameters and the high contrast-ratio over 500 : 1 could be obtained. Furthermore, excellent dispersion characteristics were also obtained in the bright state. We could confirm the performance of the proposed structure using both the numerical calculations and the experiments.

• Composites Research
• /
• v.34 no.3
• /
• pp.180-185
• /
• 2021

Due to the formation of random three dimensional network structure, which cause a lot of scattering of phonons, the thermal conductivity is low when the liquid crystalline epoxy is cured with amine-based curing agent. This problem is solved by using a cationic initiator that can make mesogen groups to be stacked structure. In this experiment, the thermal stability is compared by investigating the activation energy of isothermal decomposition through TGA of an epoxy using an amine-based curing agent and a cationic initiator. As a result, the energy of the activation of the epoxy using a cationic initiator is high. Compared with the previous experiments, the thermal stability is similar to the thermal conductivity.

• Analytical Science and Technology
• /
• v.20 no.1
• /
• pp.61-69
• /
• 2007

The geometrical parameters, total and relative energies, vibrational frequencies, the HOMO-LUMO energy gap, and reorganization energies for the neutral molecule, anion, and cation of $C_{16}H_{16}O_3$ have been determined using density functional method (DFT). The highest level of theory employed in this study is $B3LYP/6-311G^{**}$. Harmonic vibrational frequencies were determined at the $B3LYP/6-311G^{**}$ level of theory. All positive vibrational frequencies were obtained to confirm minimum structures. The HOMO-LUMO energy gap and reorganization energies were calculated to predict the charge transport property of liquid-crystal.