• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.11a
• /
• pp.80-83
• /
• 2003

We have investigated the generation of pretilt angle for a nematic liquid crystal (NLC) alignment with in-situ photoalignment method on polyimide (PI) surfaces using thin plastic substrates. The LC aligning capabilities and pretilt angle of the thin plastic substrates by in-situ photoalignment method were better than that of the glass substrate by general photoalignment. Also, the LC pretilt angle increased with increasing healing temperature and exposure time.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2004.07a
• /
• pp.340-343
• /
• 2004

The phase transition between amorphous and crystalline states in chalcogenide semiconductor films can controlled by electric pulses or pulsed laser hem: hence some chalcogenide semiconductor films can be applied to electrically write/erase nonvolatile memory devices, where the low conductive amorphous state and the high conductive crystalline state are assigned to binary states. This letters researched into the characteristic of phase change transition in differential Chalcogenide thin films materials. The electrode used Al and experimented on 100nm, 300nm, 500nm respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2005.07a
• /
• pp.611-612
• /
• 2005

Fuel cells is proved that potential energy is greater than the existing power generation. In this paper, we describe a principle of fuel cell which is used for next generation portable battery and brief characteristic of direct methanol fuel cells (DMFCs) that used for portable appliances by miniaturization of polymer electrolyte fuel cell. Lastly we describe about research investment for fuel cells.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2006.06a
• /
• pp.426-427
• /
• 2006

In this paper, the neural network model of the pretilt angle in the nematic liquid crystal on the homogeneous polyimide surface with different surface treatments is investigated. The pretilt angle is one of the main factors to determine the alignment of the liquid crystal display. The pretilt angle is measured to analyze the variation of the characteristics on the various process conditions. The rubbing strength and the hard baking temperature are considered as input factors. Latin hypercube sampling was used to generate initial weights and biases.

• International Journal of Computer Science & Network Security
• /
• v.23 no.1
• /
• pp.103-111
• /
• 2023

Implementing conventional DFT solution for arrays of DNN accelerators having large number of processing elements (PEs), without considering architectural characteristics of PEs may incur overwhelming test overheads. Recent DFT based techniques have utilized the homogeneity and dataflow of arrays at PE-level and Core-level for obtaining reduction in; test pattern volume, test time, test power and ATPG runtime. This paper reviews these contemporary test solutions for ASIC based DNN accelerators. Mainly, the proposed test architectures, pattern application method with their objectives are reviewed. It is observed that exploitation of architectural characteristic such as homogeneity and dataflow of PEs/ arrays results in reduced test overheads.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2005.07b
• /
• pp.1191-1194
• /
• 2005

The effects of addition of $D_2$ to conventional gases on the discharge characteristics were investigated in this work with the aim of improving the voltage margin, the wall charge and the jitter. The addition of an extremely small gas-inlet amounts of $D_2$ increased the number of electrons which improves the $Xe^{\ast}$ density and $Xe_2^{\ast}$ density. As a result, the voltage margin, the jitter and the wall charge increased.

• Transactions on Electrical and Electronic Materials
• /
• v.15 no.1
• /
• pp.28-31
• /
• 2014

This study aims to develop an electronic moxibustion device for the quantification of moxibustion, which progresses a critical role in traditional oriental medicine as well as to assess the characteristics of heating. The assessment revealed that the proposed electronic moxibustion treatment device can reduce the time required for reaching the desired heat level and continue to provide heat consistently. Moreover, heat transmitted to the treated area was found to correspond to a heating pattern of the proposed electronic moxibustion device. It proved both quantitative control and safe treatment for the proposed electronic moxibustion device.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.30 no.8
• /
• pp.501-507
• /
• 2017

A unimorph piezoelectric cantilever generator with an interdigitated electrode (IDE) was developed for vibration energy harvester applications driven in the longitudinal mode. Hard lead zirconate titanate (PZT) ceramic with a high $Q_m$ of 1,280 was used as the piezoelectric active material. Ten PZT sheets produced by tape casting were laminated and co-fired with an Ag/Pd IDE at $1,050^{\circ}C$ for 2 h. The approximately $280{\mu}m$-thick co-fired PZT laminate with the IDE was attached to a stainless steel substrate with an adhesive epoxy for the fabrication of an IDE unimorph cantilever. Its energy harvesting characteristics were evaluated: an output power of $1.1{\mu}W$ at 120 Hz across the resistive load of $700k{\Omega}$ was obtained, corresponding to a normalized power factor of $4.1{\mu}W/(G^2{\cdot}cm^3)$.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
• /
• 2005.11a
• /
• pp.329-334
• /
• 2005

In this paper, the characteristics of linealy bent wire antennas are first analyzed for shortening straight wire antennas. The results are appropriately applied to the design of the integrated zigzag dipole antenna. Since the integration give rise to discontinuities due to line width, the integrated parasitics are properly attached to both sides of substrate for improving the antenna gain and return loss. The design results are verified with experiments.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.11a
• /
• pp.7-8
• /
• 2008

The memory characteristics of charge trap flash (CTF) with $HfO_2$ charge trap layer were investigated. Especially, we focused on the effects of tunnel barrier engineering consisted of $SiO_2/Si_3N_4/SiO_2$ (ONO) stack or $Si_3N_4/SiO_2/Si_3N_4$ (NON) stack. The programming and erasing characteristics were significantly enhanced by using ONO or NON tunnel barrier. These improvement are due to the increase of tunneling current by using engineered tunnel barrier. As a result, the engineered tunnel barrier is a promising technique for non-volatile flash memory applications.