• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1993.05a
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• pp.113-116
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• 1993

A guided - wave electro - optical modulatored directional coupler $2{\times}2$ was fabricated on X-cut $LiNbO_3$ by proton exchange wi th self-aligned method. The Electode pattern was formed by the four extra gap electrode separtion within self-aligned electrode mask. Initial cross over state turned that by controlling the anneal ing process and self-aligned electrodes are used in fabricating the electro-optical modulatored directional coupler $2{\times}2$. The modulatored directional coupler $2{\times}2$ has very good figures of merits: the measured crosstalk was -28.2 dB and the modulating valtage of 3.2[V].

• Journal of the Korean institute of surface engineering
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• v.9 no.3
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• pp.1-4
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• 1976

In order to get high wear-resistant gold alloy plating on electronic parts, on attempt has been made, in which Cu, Ni, and Zn EDTA salts were added in gold palting solution. The results obtained on the wear resistance are as follows: 1. The addition of 0.5g/ι or over Cu in plating solution, showed 1.5 times more wear resistance than in case of no addition. 2. The addition of 1.5g/ι or over Ni, showed 3.5 times more wear-resistance . 3. The addition of 1.5g/ι and 4.0g/ι Zn , showed 3.5 times and 6.8 times more wear resistance , respectively. 4. The addition of 1.5g/ι Ni and 1.0g/ι Zn simultaneously , showed about 10 times more wear resistance than in case of no addition.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1991.10a
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• pp.29-32
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• 1991

Non-volatile SNOSFET memory devices using CMOS 1Mbit design rule(1.2$\mu\textrm{m}$), whose channel width and length are 15${\times}$1.5$\mu\textrm{m}$, 15${\times}$1.5$\mu\textrm{m}$, 2.0${\times}$15$\mu\textrm{m}$ and length are 15${\times}$1.7$\mu\textrm{m}$, respectivley, were fabricated. And the transfer, Id-Vd and switching characteristics of the devices were investigated. As a result, the 15${\times}$1.5$\mu\textrm{m}$ device was good in the transfer characteristics and the switching characteristics were favourable, which had $\Delta$V$\sub$TH/=6.3V by appling pulse voltage of V$\sub$w/=+34V, Tw=50msec.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.825-827
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• 2010

본 논문에서는 여러 스테레오 매칭 알고리즘에서 차이값 생성에 사용되는 SAD(Sum of Absolute Differences)의 윈도우 기반 하에서 효율적인 수행에 관해 제시한다. 본 $8{\times}8$ 윈도우 기반의 SAD는 데이터 입력 상태와 데이터 쉬프트 상태로 나뉜다. 데이터 쉬프트 상태에서 디스패리티가 $8{\times}8$ 개의 데이터가 한 클럭에 한번에 생성이 되며 쉬프트 동작으로 데이터 코스트의 연속적인 생성이 가능하다. 본 논문에서는 $8{\times}8$ 윈도우 기반의 SAD를 설계하고 검증한다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.19-20
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• 2005

고속 동작 다이오드를 제작하기 위해 Non punch trough 형 실리콘 pn 다이오드에 다양한 조건으로 양성자를 주입하고 조건에 따른 소자의 전류-전압 특성을 분석했다. 양성자 주입은 에너지를 2.32Mev, 2.55Mev, 2.97Mev 로 또, 각 에너지 조건에서 도즈를 $1\times10^{11}cm^{-2}$, $1\times10^{12}cm^{-2}$, $1\times10^{13}cm^{-2}$로 변화 시키며 수행했다. 분석 결과, 순방향 전류 5A에서 전압 강하는 1.1V로 주입하지 않은 최초 소자의 122%로 증가하였으며 역방향 항복전압은 양성자를 주입하지 않은 소자와 비슷한 값을 보였다. 소자의 역방향 회복시간은 50nsec로써 최초 소자의 20% 수준으로 감소했다.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.6
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• pp.1049-1056
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• 2017

In this paper, a microstrip-fed dual-band monopole antenna with two arc-shaped lines for WLAN(: Wireless Local Area Networks) applications was designed, fabricated and measured. The proposed antenna is based on a microstrip-fed structure, and composed of two arc-shaped lines and then designed in order to get dual band characteristics. We used the simulator, Ansoft's High Frequency Structure Simulator(: HFSS) and carried out simulation about parameters L2, L5, and with/without slit to get the optimized parameters. The proposed antenna is made of $13.0{\times}34.0{\times}1.0 mm^3$ and is fabricated on the permittivity 4.4 FR-4 substrate($12.0{\times}34.0{\times}1.0mm^3$). The experiment results are shown that the proposed antenna obtained the -10 dB impedance bandwidth 360 MHz (2.29~2.65 GHz) and 1,245 MHz (4.705~5.95 GHz) covering the WLAN bands. Also, the measured gain and radiation patterns characteristics of the proposed antenna are presented at required dual-band(2.4 GHz band/5.0 GHz band), respectively.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.9
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• pp.1058-1064
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• 2012

In this paper, an absorber based on metamaterial is proposed to improve the isolation of conventional WCDMA indoor repeater antenna. The proposed absorber is composed of Double Split Ring Resonators(DSRRs) and Complementary Spiral(CS) structure. The proposed absorber based on metamaterial is $9.6mm{\times}9.6mm{\times}1.2mm$ and absorption is about 94 % at 2.2875 GHz. The proposed antenna, which proposed absorber is applied to conventional WCDMA indoor repeater antenna, has isolation over 85 dB. Isolation is improved more than 10 dB compared with the conventional antenna. The VSWR is lower than 2 at WCDMA band from 1.92 GHz to 2.17 GHz. The radiation patterns are $60^{\circ}{\pm}10^{\circ}$ E-plane and H-plane, respectively. And, the gain is more than 6 dBi. The volume of proposed antenna with absorber based on metamaterial is $90mm{\times}90mm{\times}44.8mm$.

• Archives of design research
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• v.15 no.1
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• pp.327-338
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• 2002

Nowadays, in accordance with our information-oriented society, industries based on digital Technology have been quickly developing all over the world. This industryhas been playing an important role in improving the quality of peoples'lives so far and will continue to do so, both culturally and socially through industrial and economic aspects. Particularly, the electronic game, on e of the representatives, is providing an intensive value-added segment to the entertainment industry. Games are deeply rooted in people's lives and have a big influence on the industry, society and culture, even our life styles. Consequently, this study is investigating change the electronic game by the times and analyzing the game entity. It is based on the research and analysis of the transition of electronic games in each era. From now on, we will look forward, using previous material in an attempt to forecast the right direction of electronic game design in the future.

• Korean Chemical Engineering Research
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• v.50 no.4
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• pp.614-620
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• 2012

Polyurethane prepolymers were prepared from poly (carbonate diol), isophrone diisocyanate and dimethylol propionic acid. Then, aniline terminated waterborne polyurethane dispersion (ATPUD) was synthesized by capping the NCO group of the prepolymer with aniline monomer. Subsequently, ATPUD and waterborne polyurethane dispersion (PUD), respectively, were blended with conducting polymer, poly (3,4-ethylenedioxythiophene)/polystyrene sulfonate [PEDOT/PSS], to yield antistatic coating solutions, and the mixture was coated on the polycarbonate substrates. At adequate addition amounts of PEDOT/PSS less than or equal to 2.5 g, the surface resistances ($1.0{\times}10^{11}{\sim}2.5{\times}10^8{\Omega}/cm^2$) of coating films from ATPUD showed better electronic conductivities than those ($5.0{\times}10^{11}{\sim}6.3{\times}10^9{\Omega}/cm^2$) from PUD. However, at excess amount of PEDOT/PSS of 3.0 g, the surface resistance from ATPUD showed similar electronic conductivity with that from PUD.

• Proceedings of the KIEE Conference
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• 1991.07a
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• pp.194-197
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• 1991

In this study, $(Pb_{0.99}La_{0.01})[(Sb_{1/2}Sn_{1/2})_{0.10}Ti_{0.25}Zr_{0.65}]O_3$, added $MnO_2$ (0-0.30[mol%]) ceramics were fabricated by the mixed oxide method. The sintering temperature and time were $1250[^{\circ}C]$, 2[hr], respectively. In the $(Pb_{0.99}La_{0.01})[(Sb_{1/2}Sn_{1/2})_{0.10}Ti_{0.25}Zr_{0.65}]O_3$ added $MnO_2$ (0.24[mol%]) specimens, relative dielectric constant and dielectric loss were minimum values 3.52, 0.003, respectively, and Curie temperature were highest values $256[^{\circ}C]$. Pyroelectric coefficient and voltage responsivity of the $(Pb_{0.99}La_{0.01})[(Sb_{1/2}Sn_{1/2})_{0.10}Ti_{0.25}Zr_{0.65}]O_3$, and added $MnO_2$ (0.24[mol%]) specimen were good values, $6.73{\times}10^{-8}[C/cm^2K],\;125[v/W]$, respectively. Figure of merit of pyroelectric current, voltage and detectivity of the specimen, $(Pb_{0.99}La_{0.01})[(Sb_{1/2}Sn_{1/2})_{0.10}Ti_{0.25}Zr_{0.65}]O_3$ added $MnO_2$ (0.24[mol%]) were good values $2.714{\times}10^{-8}[Ccm/J],\;7.706{\times}10^{-11}[Ccm/J],\;2.640{\times}10^{-8}[Ccm/J]$, respectively. Voltage responsivity of the $(Pb_{0.99}La_{0.01})[(Sb_{1/2}Sn_{1/2})_{0.10}Ti_{0.25}Zr_{0.65}]O_3$ added $MnO_2$ (0.24[mol%]) specimens were decreased with increasing the chopper frequency.