• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.18 no.3
• /
• pp.48-54
• /
• 2004

We have developed a new experimental driving system in order to make an easier drive experiment of PDP. By using the system, we can design and simulate the timing of the pulse in computer environment. As a result of the designed timing, we are able to program at PLD(Programmable Logic Device) and control high-voltage FET switches. The new system can reduce the time of the pulse compared with the previous logic gate ICs that realizes switching logic through hardware. In addition, it is a much easier way of changing the timing of the pulse due to the change of the driving method. By using the developed driving system we experimented on two different things- First, the realization of ADS Driving Method that run commonly; Second, gray scale realization on the three electrodes AC PDP.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.14 no.4
• /
• pp.269-273
• /
• 2001

W fabricated thin film using Na$_{0.5}$K$_{0.5}$NbO$_3$ volatile material by pulsed laser deposition (PLD) and studied characterization from EM, XRD, P-E. The density and scale of droplet, which is the defect of PLD, was investigated by SEM but large droplet was not found. The degree of assemble oriented C-axis measured with X-ray diffraction suggests that this film oriented C-axis achieved by $\theta$-2$\theta$ scan and rocking curves shows good self-assemble phenomenon, finally $\phi$-scan does that all of the four directions of the lattice in film equals to those of substrate. P-E hysteresis loop shows residual remnant polarization or saturation polarization value, but it is applicable to memories.ies.

• Nuclear Engineering and Technology
• /
• v.44 no.6
• /
• pp.697-708
• /
• 2012

The majority of instrumentation and control (I&C) systems in today's nuclear power plants (NPPs) are based on analog technology. Thus, most existing I&C systems now face obsolescence problems. Existing NPPs have difficulty in repairing and replacing devices and boards during maintenance because manufacturers no longer produce the analog devices and boards used in the implemented I&C systems. Therefore, existing NPPs are replacing the obsolete analog I&C systems with advanced digital systems. New NPPs are also adopting digital I&C systems because the economic efficiencies and usability of the systems are higher than the analog I&C systems. Digital I&C systems are based on two technologies: a microprocessor based system in which software programs manage the required functions and a programmable logic device (PLD) based system in which programmable logic devices, such as field programmable gate arrays, manage the required functions. PLD based systems provide higher levels of performance compared with microprocessor based systems because PLD systems can process the data in parallel while microprocessor based systems process the data sequentially. In this research, a bistable trip logic in a reactor protection system (RPS) was developed using very high speed integrated circuits hardware description language (VHDL), which is a hardware description language used in electronic design to describe the behavior of the digital system. Functional verifications were also performed in order to verify that the bistable trip logic was designed correctly and satisfied the required specifications. For the functional verification, a random testing technique was adopted to generate test inputs for the bistable trip logic.

• Toxicological Research
• /
• v.22 no.1
• /
• pp.9-13
• /
• 2006

Diesel exhausted particles (DEP), a kind of fine particles with aerodynamic diameters less than $2.5{\mu}m$ (PM2.5), is of great concern to human health because they remain in atmosphere for long periods, invade an indoor air environment, and can be breathed most deeply into lung and reached the alveoli because of their small size ($0.1{\sim}0.4\;{\mu}m$ in diameter). Epidemiological and experimental studies suggested that DEP may play an active role in the increased respiratory mortality and morbidity. In addition to their physical characteristics, the chemical components including polyaromatic hydrocarbon (PAH) are regarded as a carcinogen causing pulmonary tumors. PLD plays an important role in cell proliferation with various physiological phenomena and affects other enzymes by activating signal transduction pathway. We investigated the cytotoxic mechanism of DEP on RAW 264.7 cells focusing on the role in activation of PLD. Our results suggested DEP induced PLD activity through a specific signaling pathway involving phospholipase $A_2$, PLC, PKC and $Ca^{2+}$ mobilization.

• Progress in Superconductivity and Cryogenics
• /
• v.6 no.4
• /
• pp.1-4
• /
• 2004

Three group samples with difference thickness of $CeO_2$ capping layer deposited by PLD were studied. Among them, one group $CeO_2$ films were deposited on stainless steel tape coated with IBAD- YSZ and $CeO_2$ buffer layer ($CeO_2$/IBAD-YSZ/SS); other two groups of $CeO_2 YSZ Y_2O_3$multi-layer were deposited on NiW substrates for fabrication of YBCO coated conductor through RABiTS approach. The pulsed laser deposition (PLD) and DC magnetron sputtering were employed to deposit these buffer layers. On the top of buffer layer, YBCO film was deposited by PLD. The effect of thickness of $CeO_2$ film on the texture of $CeO_2$ film and critical current density ($J_c$) of YBCO film were analyzed. For the case $CeO_2$ on $CeO_2$/IBAD-YSZ/SS, there was a self-epitaxy effect with the increase of $CeO_2$ film. For $YSZ/Y_2O_3$ NiW which was deposited by PLD or DC magnetron sputtering, there is not self-epitaxy effect. However, the capping layer of $CeO_2$ film deposited by PLD improved the quality of buffer layer for $YSZ/Y_2O_3$ which was deposited by DC magnetron sputtering, therefore increased the $J_c$ of YBCO film.

• Korean Journal of Materials Research
• /
• v.11 no.4
• /
• pp.319-323
• /
• 2001

In order to investigate the effect of thickness on the properties of ZnO thin films, a series of films having different thickness were deposited on (0001) sapphire by using pulsed laser deposition(PLD). SEM and XRD analyses showed that, as the film thickness increases, the grain size increased and the crystallinity improved. Room-temperature PL spectra also exhibited that the intensities of both ultraviolet and deep level emission Peaks increased as the film thickness increased. Hall measurements at room- temperature revealed that, as the film thickness changes from 400 to 4000 , the carrier concentration of the film showed sharp decrease, which that of thicker film gradually saturated. Therefore, it is concluded that the strain due to the lattice mismatch between substrate and film is fully relaxed around the thickness of 4000 .

• Journal of fish pathology
• /
• v.17 no.2
• /
• pp.131-137
• /
• 2004

In the present study, phosphatidylcholine (PC) hydrolyzing enzyme had been isolated from membrane of flounder liver. PC hydrolyzing enzyme solubilized in 1% Triton X -100 from membrane was partially purified by sequential chromatography on Heparin Sepharose CL-6B and Heparin-5PW columns. The products by membrane-bound hydrolyzing enzyme were identified as phosphatidic acid and choline, but in the presence of primary alcohol, phosphatidylethanol was produced at the expense of phosphatidic acid. These data suggest that membrane-bound enzyme may be a PC-phosphoipase D (PLD) type. The enzyme had pH optimum at below 6.0 and temperature optimum at $37^\circ{C}$. The activity of PC-PLD was dose-dependently increased by $Ca^{2+}$ but not $Mg^{2+}$. The activity of PC-PLD was stimulate by PC, PIP2 and PE.

• Journal of the Institute of Convergence Signal Processing
• /
• v.8 no.4
• /
• pp.285-292
• /
• 2007

SoC which deploys software modules as well as hardware IPs on a single chip is a major revolution taking place in the implementation of a system design, and high-level synthesis is an important process of SoC design methodology. Recently, SPARK parallelizing high-level synthesis software tool has been developed. It takes a behavioral ANSI-C code as an input, schedules it using code motion and various code transformations, and then finally generates synthesizable RTL VHDL code. Although SPARK employs various loop transformation algorithms, the synthesis results generated by SPARK are not acceptable for basic signal and image processing algorithms with nested loop. In this paper we propose a SoC platform with an application-specific PLD targeting local operations which are feature of many loop algorithms used in signal and image processing, and demonstrate design process which maps behavioral specification with nested loops written in a high-level language (ANSI-C) onto 2D systolic array. Finally the derived systolic array is implemented on the proposed application-specific PLD of SoC platform.

• Proceedings of the KIEE Conference
• /
• 2005.07c
• /
• pp.1841-1843
• /
• 2005

냉간 압연과 열처리 공정을 통해 2축 배향성을 가지는 금속 기판 위에 산화물 박막을 중착 시켜 같은 정도의 2축 배향성을 갖도록 제조된 RABiTS template 위에 YBCO 초전도체를 PLD 방법으로 증착하여 YBCO coated conductor 선재를 제조하였다. RABiTS template은 $NiW/Y_2O_3/YSZ/CeO_2$ 구조로 DC reactive sputtering와 PLD 방법에 의해 증착되었다. 모든 공정은 reel-to-reel 방식의 연속 공정으로 이루어졌다. 1m와 10m급의 장선 고온초전도선재를 제조하고, 이에 대한 전기적 특성과 초전도 및 다층 산화물 완충층에 대한 결정성, 표면 특성에 대한 분석을 수행하였다. 그 결과 1m 길이에서 end-to-end 107A와 10.6m 길이에서 end-to-end 51A의 임계 전류를 획득하였다. 제조된 박막형 선재의 초전도 층과 다층의 산화물 완충층 모두 금속 기판의 결정성을 그대로 유지하면서, epitaxial하게 성장하였으며, 최종 YBCO의 in-plane FWHM 값은 > $9^{\circ}$를 유지하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2005.07a
• /
• pp.50-51
• /
• 2005

냉간 압연과 열처리 공정을 통해 2축 배향성을 가지는 금속 기판 위에 산화물 박막을 증착 시켜 같은 정도의 2축 배향성을 갖도록 제조된 RABiTS template 위에 YBCO 초전도체를 PLD 방법으로 증착하여 YBCO coated conductor 선재를 제조하였다. RABiTS template은 NiW/$Y_2O_3$/NSZ/$CeO_2$ 구조로 DC reactive sputtering와 PLD 방법에 의해 증착되었다. 모든 공정은 reel-to-reel 방식의 연속 공정으로 이루어졌다. 1m와 10m급의 장선 고온초전도선재를 제조하고, 이에 대한 전기적 특성과 초전도 및 다층 산화물 완충층에 대한 결정성, 표면 특성에 대한 분석을 수행하였다. 그 결과 1m 길이에서 end-to-end 107 A와 10.6m 길이에서 end-to-end 51A의 임계 전류를 획득하였다. 제조된 박막형 선재의 초전도 층과 다층의 산화물 완충층 모두 금속 기판의 결정성을 그대로 유지하면서, epitaxial하게 성장하였으며, 최종 YBCO의 in-plane FWHM 값은 > $9^{\circ}$를 유지 하였다.