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정종혁,최병진 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(B)
기존의 비상구 표시등은 20-30[W] 정도의 많은 전력 소모와 2천시간 정도의 짧은 램프 수명 등으로 인해 전기에너지의 소모가 많으며, 부피가 커 시공 및 설치가 어렵다. 따라서, 본 논문에서는 도광판을 사용한 비상등의 개발에 관하여 연구하기 위하여 가시광선 투과율이 94%이상으로 높고 가공이 용이한 투명 PMMA(Poly Methyl Meth Acrylate)판에 광반사면을 광학적 시뮬레이션에 의해 설계된 V자형 홈선을 가공하여 비상등의 도광판(導光板)으로 사용한다. 이 구조는 기존의 비상등에 비해 광이용 효율이 높고, 설계의 자유도가 높아질 것으로 기대된다. 또한, CCFT(Cold Cathode Fluorecent Tube) 램프, 광확산필름, 프리즘필름, 몰드프레임 등을 이용하여 광이용 효율을 극대화하는 구조를 고안하고, 인버터 구동을 위한 주변회로 시스템을 개발하여 초절전형 평판 비상등 시스템의 양산 기술을 확보함을 목적으로 한다.
정종혁,강상욱,윤정오 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(C)
This paper develops a High Power RF Amplifier circuit which can produces Low Temperature Plasma. The input signal which has the frequency 13.56[MHz] was forced in the RF circuit designed by the high efficency class C amplifier. Above all the date tested by the trial network, which were close to the computed results on the theory. In order to avoid the overload and impedance mismatching of the Plasma Facilities due to changing factors, this paper shows that this pheonomena could be eleminated by a inserting impedance matching box between RF amplifier and Dummy load. This performance of Impedance matching box(SWR=1.05) were good specified.
정종혁,조영창 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(B)
WRC-2000 adopted the Regions 1 and 3 BSS and associated feeder-link Plans as well as the Regions 1 and 3 BSS and associated feeder-link Lists. These Regions 1 and 3 BSS and associated feeder-link Plans provide, in general, each country of Region 1 with 10 digital channels of 27 MHz bandwidth and each country of Region 3 with 12 digital channels of 27 MHz bandwidth. In this study, we summarize the results of associated meetings and analyze the effects of BSS replanning in Korea. We study the effective interference analysis through the review of Radio Regulations and associate Resolution. Furthermore, interference analysis of inter-broadcasting satellite systems will be done with MSPACEG S/W.
우수한 고조파 왜곡 특성을 가진 피드포워드 증폭기에 관한 연구
정종혁,강상욱,윤정오 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)
Generally, the distortion of the negative feedback amplifier is reduced by a factor equal to the return difference (1 + β_1A_1), but the proposed feedforward amplifier is reduced by a factor equal to square of the return difference (1 + β_1A_1). In this paper, a feedforward amplifier with error correction is designed and implemented. So as to evaluate the characteristics of the harmonic distortion that the inverting feedforward amplifier is compared with that of the reference amplifier without feedforward error correction. It is confirmed that the proposed method should be able to improve much greater than compared with a conventional negative feedback amplifier. Therefore it should be noted that the proposed feedforward amplifier network is also acceptable for wide-band amplifiers and all of the network for the needless of harmonic distortion.