• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.340-341
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• 2005

Three different composition 130um thickness PZT were fabricated by extrusion method and burned out at $550^{\circ}C$ and sintered at $1260^{\circ}C$/2.5hrs. Actuator was fabricated using glass and Si(100) wafer by MEMS process. From XRD data, in case of DECH, perovskite phase peak strength is higher than others. We were able to obtain the information of grain growth and porosity by SEM images. Also DECH PZT on glass membrane(100um thickness) have larger displacement than others.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.10
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• pp.1982-1988
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• 2002

Micro-injection molding and microfluidic devices with the help of MEMS technologies including the LIGA process are expected to play important roles in micro-system industries, in particular the bio-application industry, in the near future. Understanding fluid flows in micro-channels is important since micro-channels are typical geometry in various microfluidic devices and mold inserts for micro-injection molding. In the present study, Part 1, an experimental investigation has been carried out to understand the detailed flow phenomena in micro-channel filling process. Three sets of micro-channels of different thickness (40um,30um and 2011m) were fabricated using SU-8 on silicon wafer substrate. And a flow visualization system was developed to observe the filling flow into the micro-channels. Experimental flow observations are extensively made to find the effects of pressure, inertia force, viscous force and surface tension. A dimensional analysis for experimental results was carried out and several relationships A dimensionless parameters are obtained.

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.1
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• pp.65-73
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• 1986

Experiment have been conducted about thin oxide characteristics according to O2/N2 ratio needed for EEPROM cell fabrication. As a result, we think that there is no problem even if we grow oxide layer with large O2/N2 ratio and short exidation time and when the water is implated by As before oxidation, the oxide breakdown field is about IMV/cm lower than that is not implanted. Especially, the thin oxide characteristic seems to be affected largely by wafer cleaning and oxidation in air. On the basis of these, tunnel type EEPROM cell is fabricated by 3um CMOS process and its characteristic is studied. Tunnel oxide thickness(100\ulcorner is chosen to allow Fowler-Nordheim tunneling to charge the floating gate at the desired programming voltage and tunnel area(2x2um\ulcorneris chosen to increase capacitive coupling ratio. For program operation, high voltage (20-22V) is applied to the control gate, while both drain and source are gdrounded. The drain voltage for erase is 16V. It is shown that charge retention characteristics is not limited by leakage in the oxide and program/erase endurance is over 10E4 cycles of program erase operation.

• The Journal of Korea CHUNA Manual Medicine
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• v.4 no.1
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• pp.129-140
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• 2003

Objectives : This study researched into clinical statistics for patients recieved oriental medicine treatments In the Um-sung Gun Dae-so Myun health care center during eight months from May 1 2002 to December 31 2002. The number of object was 246 cases of 234 persons. Results & Conclusions : Analyzing these 234 persons, the rate of males to females was 1 to 2.1. As for the distribution of age, the age of 61 to 70 occupied 44.02 % and the age of 61 to 90 occupied 76.5 % ih the Whole patients. Therefore female was very highly more than male and patients were for the most part, old ages (61 years old and over) Musculoskeletal disease of 202 cases occupied 82.13 %, were the highest rate. At the duration of disease 1 year to 5 years occupied 26.92 %, was the highest. The Grade II was the most of the sign of patients at first visit, it occupied 47.86 %, The Fair(+) and over effect of treatments occupied 96.84 %, the failure(-) Of effect treatments occupied 3.16 %. As for the duration of treatment, the case of 2 times to 5 times visit occupied 38.03 %, was the highest. By medication of treatment, O-juk-san(五積山) occupied 35.10 %, was the highest rate. The average 8.67 persons treated with oriental medicine a day, the average 1.36 person received the first medical examination a day.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.42 no.4 s.334
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• pp.61-68
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• 2005

A chip, which can fast encoder the audio data to AAC (Advanced Audio Coding) LC(Low Complexity) that is MPEG-2 audio standard, has been designed on the basis of a 32 bits DSP core and fabricated with 0.25um CMOS technology. At first, the various optimization methods for implementing the algerian are devised to reduce the memory size and calculation cycles. FFT(Fast Fourier Transform) hardware block is added to the DSP core to get the more reduction of the calculation cycles. The chips has the size of $7.20\times7.20 mm^2$ and about 830,000 equivalent gates, can carry out AAC encoding under 70MIPS(Million Instructions per Second).

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.11
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• pp.12-17
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• 1999

In this paper, we proposed a novel CB-CPW(Conductor Backed CPW) for suppression of crosstalk caused by PPL(Parallel Plate Line) mode in the millimeter wave frequency. The proposed structure is formed by the GaAs main substrate attached on the Si lossy layer. The PPL mode can be suppressed by the Si lossy layer of conductivity ${\sigma}$, and it reduces the crostalk between the nearby transmission lines. Using 200 um thick Si substrate of ${\sigma}$ = 30S/m, as the lossy layer, the crosstalk can be suppressed below - 40 dB at 60 GHz. The proposed method is costly effective because inexpensive Si wafer is employed to suppress the PPL mode, and it can be used in the various types of millimeter wave applications.

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.2
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• pp.125-131
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• 2010

This paper presents the implementation of a EBCOT TIER-1 for JPEG2000 Encoder. JPEG2000 is new standard for the compression of still image for overcome the artifact of JPEG. JPEG2000 standard is based on DWT(Discrete Wavelet Transform) and EBCOT Entropy coding technology. EBCOT(Embedded block coding with optimized truncation) is the most important technology that is compressed the image data in the JPEG2000. However, EBCOT has the artifact because the operations are bit-level processing and occupy the harf of the computation time of JPEG2000 Compression. Therefore, in this paper, we present modified context extraction method for enhance EBCOT computational efficiency and implemented MQ- Coder as arithmetic coder. The proposed system is implemented by Verilog-HDL, under the condition of TSMC 0.25um ASIC library, gate counts are 30,511EA and satisfied the 50MHz operating condition.

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.27.1-27.1
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• 2008

KASI (Korea Astronomy and Space Science Institute) is developing a compact wide-field survey space telescope system, MIRIS (The Multi-purpose IR Imaging System) to be launched in 2010 as the main payload of the Korea Science and Technology Satellite 3. Through recent System Design Review (SDR) and Preliminary Design Review (PDR), most of the system design concept was reviewed and confirmed. The near IR imaging system adopted short F/2 optics for wide field low resolution observation at wavelength band 0.9~2.0 um minimizing the effect of attitude control system. The mechanical system is composed of a cover, baffle, optics, and detector system using a $256\times256$ Teledyne PICNIC FPA providing a $3.67\times3.67$ degree field of view with a pixel scale of 51.6 arcsec. We designed a support system to minimize heat transfer with Muti-Layer Insulation. The electronics of the MIRIS system is composed of 7 boards including DSP, control, SCIF. Particular attention is being paid to develop mission operation scenario for space observation to minimize IR background radiation from the Earth and Sun. The scientific purpose of MIRIS is to survey the Galactic plane in the emission line of Pa$\alpha$ ($1.88{\mu}m$) and to detect the cosmic infrared background (CIB) radiation. The CIB is being suspected to be originated from the first generation stars of the Universe and we will test this hypothesis by comparing the fluctuations in I (0.9~1.2 um) and H (1.2~2.0 um) bands to search the red shifted Lyman cutoff signature.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.40 no.2
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• pp.161-165
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• 2004

The main goal of this work is to study the effect of glass fiber volume fraction on the result of tensile test with respect to glass fiber/polypropylene(GF/PP) composites. The tensile test and failure mechanisms of GF/PP composites were investigated in the fiber volume fraction range from 10% to 30%. The tensile strength and the fracture strength increased with the increasing of the fiber volume fraction in the tested range. Fiber pull-out and debonding of this composites increased with the fiber volume fraction in thc tested range. The major failure mechanisms were classified into the debonding, the fiber pull out, the delamination and the matrix deformation.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1535_1536
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• 2009

본 논문에서는 1.5um 파장대에서 감쇄기를 이용한 유사단일광원을 이용하여 단일광자검출의 특성을 실험적으로 분석하였다. Gated Geiger 모드에서 APD를 동작 하여 열적 노이즈에 따른 양자효율을 측정하였다. 또한 APD를 이용하여 단일광자를 고속으로 검출시 문제가 되는 afterpulsing 노이즈의 온도별 특성을 분석하였다.