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Mach-Zehnder형 진행파 Ti:$LiNbO_3$ 광변조기의 제작 및 변조응답 추정
한영탁,이우진,고병국,이병권,김창민,Han, Yeong-Tak,Lee, U-Jin,Go, Byeong-Guk,Lee, Byeong-Gwon,Kim, Chang-Min 대한전자공학회 2001 電子工學會論文誌-SD (Semiconductor and devices) Vol.38 No.11
Mach-Zehnder type traveling-wave Ti:LiNb $O_3$ optical modulators were designed and fabricated. Optimum parameters of optical waveguides were calculated by means of the FDM. Design of CPW traveling-wave electrodes were performed by the FEM in the active region and by the CMM in the input/output section to obtain the conditions of MW effective index and impedance matching. From the measured S parameters, MW characteristics of the traveling-wane electrodes were extracted to be ${\alpha}_m$=0.05426 $\sqrt{f}$, $N_{eff}$=2.2025, and $Z_{c}$=39 ${\Omega}$. The calculated optical response R($\omega$) showed the 3 dB bandwidth of 10 GHz.z.. Mach-Zehnder 간섭기를 이용한 Ti:$LiNbO_3$ 진행파 광변조기를 설계 및 제작하였다. FDM을 이용하여 광도파로의 최적 설계치를 추출하였다. CPW 진행파전극의 MW 유효굴절률 및 특성임피던스를 정합시키기 위하여 taper 영역의 입·출력단에서는 CMM을, 변조영역에서는 FEM으로 설계를 수행하였다. 제작된 소자의 MW 특성으로는, S 파라미터로부터 감쇠상수 ${\alpha}_m$=0.05426 $\sqrt{f}$, MW 유효굴절률 $N_{eff}$=2.2025, 특성임피던스 $Z_c$=39 ${\Omega}$이 추출되었다. MW 특성으로부터 계산한 주파수응답 $R({\omega})$의 3 dB 변조대역폭은 ~10GHz으로 예측되었다.
다변량분석에 의한 한국 서남해안 신안 김양식장의 환경해석
정희석(Hee-Suk JUNG),신봉균(Bong-Kyun SHIN),배종일(Jong-Il BAE),한영탁(Yeong-Tak HAN),전병현(Byeong-Hyeon JEON),김유진(Yu-Jin KIM),신종암(Jong-Ahm SHIN),황성일(Sung-Il HWANG) 한국수산해양교육학회 2021 水産海洋敎育硏究 Vol.33 No.2
For the data-based Pyropia cultivation further, we analysed the environmental data using a multivariate analysis of a Pyropia aquaculture farm off Imja island in Shinan, Jeollanam-do, Korea, from September 2019 to March 2020 for the first time. The pairwise simple correlation matrix among 13 seawater environmental variables was shown. The first three principal components explained 76% of the total sample variance. The first principal component(z1) showed the freshwater inflow and/or precipitation, the z2 related to nutrients, and the z3 eutrophication.
다변량분석에 의한 한국 서해중부 서천 김양식장의 환경평가
신봉균(Bong Kyun SHIN),정희석(Hee Suk JUNG),배종일(Jong Il BAE),한영탁(Yeong Tak HAN),김동욱(Dong Uk KIM),신종암(Jong-Ahm SHIN),황성일(Sung Il HWANG) 한국수산해양교육학회 2021 水産海洋敎育硏究 Vol.33 No.1
We evaluated the water quality(13 variables) in a Pyropia cultivation farm in Seocheon, Chungcheongnam-do, Korea, using a multivariate analysis from September 2019 to March 2020. The pairwise simple correlation matrix among variables was shown. The first four principal components explained 79% of the total sample variance. The first principal component(z₁) showed the freshwater inflow and precipitation, the z₂ related to seasonal influence, the z₃ related to season and/or freshwater, and the z₄ related to transparency. The present study is the first step for the data-base and future-oriented Pyropia cultivation