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CO_2 초임계 유체/전도성 에멀젼용액을 이용한 구리판에 대한 니켈 나노도금에 관한 연구
홍교민,홍성철,김문선,정재관 한국공업화학회 2002 응용화학 Vol.6 No.2
In this study, experiments of a nickel elecroplating were performed by a conductive emulsion solution of CO_2/electrolyte/surfactant/entrainer in the supercritical nanoplating system to investigate the effect of the resistivity on plating properties. Resistivity values decreased 60, 35, and 22 Ω at 20, 30, and 50 wt% electrolyte, respectively, and over 60 wt%, the resistivity value was kept constant at 20 Ω. Surface properties of nickel film electroplated by the emulsion solution with 60 wt% electrolyte at 8 MPa was better than that at atmospheric pressure.
Supercritical nano-plating 시스템에서 전해질/계면활성제 조성이 니켈 전기도금에 미치는 영향에 관한 연구
홍교민,김문선,정재관 한국공업화학회 2003 응용화학 Vol.7 No.1
In this study, experiments of a nikel elecroplating were performed in a supercritical nano-plating system using CO_2 as a supercritical fluid. Electrolyte and surfactant were important parameters on the nickel plating proces. Resistivity values decreased 60, 35, and 22 at 20, 30, and 50 wt% electrolyte, respectively, and over 60 wt%, the resistivity value was kept constant at 20. Surface properties of nickel film electroplated by the 60 wt% electrolyte solution with 2 wt% surfactant. The weight ratio of CO_2 and electrolyte as 1:9 was better then any other ratio in the plating properties.
수용액에서 γ형 알루미나 표면에 대한 니켈이온(Ⅱ)의 흡착특성
홍교민,김문선,정재관 한국공업화학회 2003 공업화학 Vol.14 No.3
γ형 알루미나의 흡착특성을 구명하기 위하여 본 실험에서는 수용액에서 γ형 알루미나를 흡착제로 이용하여 온도와 pH가 니켈이온(Ⅱ)의 흡착능에 미치는 영향을 관찰하고 알루미나 표면과 니켈이온(Ⅱ) 간의 Langmuir와 Freundlich 흡착등온식과 Lagergren 흡착속도식을 결정했다. 5 g Al_2O_3/L의 조건에서 니켈이온은 10 h에 흡착평형상태에 도달했다. PH 2~6의 범위에서 pH가 증가할 때 흡착량은 급격히 증가하다가 PH 6에서 최대 흡착량을 나타냈으며 pH 6~9의 범위에서는 pH가 증가하여도 흡착량은 일정했다. 온도 20℃에서는 흡착량이 적었으나 30℃에서 급격히 흡착량이 증가하였으며 30~50 ℃의 범위에서는 온도 증가에 따라 흡착량이 완만하게 증가했다. Freundlich 흡착등온식의 결정계수는 0.9489로 Langmuir식의 0.9265보다 높았으며 Lagersen 흡착속도식에서의 k_ad값은 0.0023 h^-1으로 결정계수는 0.9497이였다. In this paper, Langmuir and Freundlich adsorption isotherms, and Lagergen adsorption rate were determined and the effect of temperature and pH on the adsorptivity of Ni(Ⅱ) ions were investigated in order t() stud)'the adsorption characteristics of γ-type alumina. For 5 g Al_2O_3/L, the adsorption equilibrium was obtained in 10 h. The adsorption amount increased rapidly when pH incrteased from 2 to 6, and the maximum adsorption amount was observed at pH 6. For pH 6 to 9, however, the adsorption amount remained constant. The adsorption amount was low at 20℃. However, The adsorption amount increased with increased in temperature; the amount increased rapidly at 30℃ and increased linearly with temperature from 30 to 50℃. The correlation coefficient (R_2) for Freundlich adsorption isotherm was 039489%, and this was higher than that for Langmuir adsorption isotherm of 0.9268%. The adsorption coefficient (k_ad) of lagergen equation was 0.0023h^-1, and the correlation coefficient (R^2) was 0.9497.
홍교의(Gyo-Eui Hong) 산업기술교육훈련학회 2017 산업기술연구논문지 (JITR) Vol.22 No.3
In this paper, the control of the steam boiler has improved by the room thermostat, and the system was constructed of ICT-based sensors. The room controller and the sensor system was applied to wireless data transmission. The sensor system was a sensor module and the sensor platform. Experiments were performed to verify the performance of the climate control system and sensor. The experimental system was implemented for this purpose. Through the combination of the sensor system and the room thermostat, it could be improved more than about 80% of the error in accordance with the conventional temperature control. The system was designed to transfer data to the climate control system by the sensor, and controlled in the main controller. The performance of the ICT-based climate control was verified by this experiment.
홍교영,윤경호,김유창,김원후 한국항행학회 1998 韓國航行學會論文誌 Vol.2 No.1
대기권 전파에 따른 심각한 다중파 페이딩 채널인 HF 대역을 사용하는 장거리 항공이동 통신의 페이딩 영향을 극복하는 방안으로 RZ-SSB 방식을 도입하였다. RZ-SSB의 전송대역은 ARINC 규정에 기술되어 있는 AME 즉, 반송파를 삽입한 단측파대 통신방식과 유사하기 때문에 이러한 설계 파라미터를 활용한 송, 수신기를 설계하였다. 또한 설계 시에는 32비트 부동소수점 연산 DSP를 이용함으로써 신호의 질과 신뢰도를 향상시켰고, 이로 인하여 성능이 향상된 저증량, 저가격의 송, 수신기를 설계하였다. 리미터의 사용과 복조시 변조방식과 상이한 위상 복조의 개념을 도입하여 다중파 진폭 페이딩을 제거하였고, 또한 항공전자 시스템의 특성으로 RZ-SSB 방식의 근원적인 단점 또한 극복되고 항공통신에의 적용이 가능함을 실험 결과로 제시한다. This paper descries some design concepts and design parameters of RZ-SSB which allows full carrier insertion into the single side band to overcome the severe fading in aeronautical telecommunication, and it is described in ARINC Spec. in the name of AME(AM Equivalent), and the necessary transmission bandwidth of RZ-SSB is similar to that of a aeronautical telecommunication. As an amplitude limiter manage to remove the amplitude fading without degrading the quality of output signal, the receiver acts like the FM demodulators. Using the digital Signal Processing (DSP) techniques in the design of transceiver systems has become a performance enhancement of the signal quality and reliability, and making use of DSP, it's able to design low cost, compact transceiver and reduce its weight. For avionics systems is able to eliminate the inherent disadvantages in RZ-SSB, the results of experimental tests suggest that the adoption of RZ concepts is suitable for aeronautical telecommunication transceiver systems use in HF band.