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한학수(Han Hag-Su),민경윤(Min Kyung-Yun),유기선(Ryu Ki-Son) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Electric Power cable is the apparatus that receives electric power from the Korea Electric Power Corporation and supplies electric power to electric train and annex facilities of each railway station. With substantial ripple effect during power blackout accidents, such power blackout accidents must be coped with by discriminating the status of insulation deterioration of electric power cable in advance. Discrimination of insulation deterioration of the electric power cable is normally executed while the power is disconnected and it is very difficult to discover, at early stage, the insulation deterioration of the power cable in operational state since the duration of inspection is limited. This research aims to consider method of diagnosing the insulation deterioration of electric power cable in On-Line state rather than diagnosis in Off-Line state in order to secure reliability of power supply by reducing duration of power blackout (accidental blackout and blackout during works) and by seeking reduction in equipment and manpower used in diagnosis of deterioration through prevention of the accident itself prior to occurrence through early restoration of accident due to insulation deterioration of the electric power cable and assessment of performance of the cable under operation.
개구결합을 이용한 H 형태 초전도 안테나의 제작 및 특성 해석
정동철,한병성,유기수,이종하,석중현,이은홍,Chung, Dong-Chul,Han, Byoung-Sung,Ryu, Ki-Su,Lee, Jong-Ha,Sok, Jung-Hyun,Lee, Eun-Hong 대한전자공학회 2000 電子工學會論文誌 IE (Industry electronics) Vol.37 No.1
"H" 형태의 공진기로서 이루어진 초전도 안테나는 비슷한 크기를 가진 마이크로스트립 안테나에 비하여 소형화에 유리하다. "H"형 초전도 안테나 제작을 위해 rf 마그네트론 스퍼터링을 이용하여 $YBa_2Cu_3O_{7-x}$ (YBCO)/MgO 고온초전도 박막을 제조하였으며 표준 식각법을 이용하여 안테나를 형상화 하였다. 일반 금속과의 특성을 비교하기 위해서 동일한 차원의 금 안테나가 제작되었다. 개구 결합 방식을 이용하여 초전도 안테나 패치와 $50{\Omega}$ 급전선을 임피던스 결합을 시켰다. 다양한 종류의 실험 결과가 반사손실, 공진주파수, 특성임피던스 등을 중심으로 보고되었다. H형 초전도 안테나는 금 안테나에 비하여 정재파비에서 0.36 효율에서 24% 반사손실에서 14.6bB 이상 더 우수한 성능을 보여주었다. The high-$T_c$ Superconducting (HTS) antenna which consists of "H" type resonator has the benefits for the miniaturization of antenna in comparison with the microstrip antenna of the similar dimension. To fabricate the "H" type antenna, HTS $YBa_2Cu_3O_{7-x}$ (YBCO) thin films were deposited on MgO substrates using rf-magnetron sputtering. Standard etching processes were performed for the patterning of the "H" type antenna. For comparison between normal conducting antennas and superconducting antennas, the gold antennas with the same dimension were also fabricated. An aperture coupling was used for impedance matching between $50{\Omega}$ feed line and HTS radiating patch. The diverse experimental results were reported in terms of the resonant frequency, the return loss and the characteristics impedance. The "H" type superconducting antenna showed the performance of 1.36 in SWR, 24% in efficiency, and 14.6 dB in the return loss superior of the normal conducting counterpart.
한구택 ( Ku Taek Han ),이형근 ( Hyung Kun Lee ),유순원 ( Sun Won Yoo ),송영훈 ( Young Hun Song ),최원영 ( Won Young Choi ),유기성 ( Ki Sung Ryu ),나종구 ( Jong Gu Rha ),송승규 ( Seung Kyu Song ),이헌영 ( Hun Young Lee ),김수평 ( S 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.12
Expression of four biologic markers known as p53, proliferating cell nuclear antigen(PCNA), c-myc, and epidermal growth factor receptor(EGFR), was studied immunohistochemically in 121 cases of cervical tissues, which included 15 cases of normal cervical tissues, 50 cases of squamous intraepithelial lesions(SIL), and 56 cases of invasive carcinomas. This study was designed to elucidate the roles of these factors in the genesis and progression of cervical neoplasia and to identify their association with clinical parameters such as cell type, tumor size, lymph node involvement, squamous cell carcinoma(SCC) antigen level, and prognosis. In additon, this study evaluates the differences of coexpression rates in normal cervical tissues, SILs, and invasive carcinomas. (1) The intensities of p53, c-myc, and EGFR expression and the rates of PCNA, c-myc, and EGFR expression in cervical SILs and invasive carcinomas were significantly higher than those in normal tissues (p<0.05 and p<0.01). But there were no significant differences between SILs and invasive carcinomas in both of intensities and rates of p53, PCNA, c-myc, and EGFR expression. (2) The intensities and rates of p53, PCNA, and c-myc expression in the invasive carcinomas did not correlate with clinical parameters including cell types, tumor sizes, lymph node involvements, see antigen, and prognosis. But only the intensity and rate of EGFR expression were significantly higher in cases with tumor size larger than 3 cm when it was compared with cases with tumor sizes smaller than 3 cm(p<0.01), in cases with lymph node involvement when it was compared with cases without lymph node involvement(p<0.05), and in cases with SCC antigen levels more than 2.5 ng/ml when it was compared with cases with SCC antigen levels less than 2.5 ng/ml(p<0.05). (3) C-myc immunoreactivity was significantly correlated with EGFR overexpression(p<0.01). (4) The rates of simultaneous expression of four factors were decreased significantly in normal tissues and significantly increased in invasive carcinomas(p<0.01). The coexpression rate of two factors or more was 6.7% in normal tissues, 62.7% in SILs, and 70.0% in invasive carcinomas and the simultaneous expression rate of three factors or more was none in normal tissues, 34.0% in SILs, and 47.5 % in invasive carcinomas. These results show that the immunohistochemical detection of p53, PCNA, c-myc, and EGFR expression will be useful in differentiating the normal tissues and cervical neoplasia. The results of simultaneous immunohistochemical detection of these four factor expression also suggest to contribute a better understanding of the genesis of cervical carcinoma and that coexpression of more factors indicate more aggressiveness in cervical neoplasia, and show that simultaneous detection of these factors can be used in the early detection of cervical neoplasia and to predict malignant transformation of cervical lesions.
직접삽입 급전 방식을 이용한 고온초전도 마이크로스트립 안테나의 제작 및 특성 해석
정동철,한병성,김진,유기수,홍석용,이종하,Chung, Dong-Chul,Han, Byoung-Sung,Kim, Jin,Ryu, Ki-Su,Hong, Suck-Yong,Lee, Jong-Ha 대한전자공학회 2000 電子工學會論文誌 IE (Industry electronics) Vol.37 No.1
초전도체를 초고주파 소자에 응용하려고 할 경우, 초전도 전자기학의 불확실함이나 초전도 기판의 돈도 의존성은 산업 응용을 위한 안테나를 제작하는데 있어 어려움을 준다. 따라서 실제 응용을 위해서는 일반 안테나와 비교하여 정확하고 자세한 특성이 알려져야만 한다. 본 논문에서는 금 안테나와 초전도 안테나의 비교 연구를 수행하였으며 반사 손실, 특성임피던스, 효율 및 다른 다양한 특성들을 보고하였다. 본 연구에 사용된 고온초전도 박막은 $YBa_2Cu_3O_{7-x}$ (YBCO)/MgO 이며 초전도 안테나는 마이크로스트립 급전선을 방사 패치의 50 ${\Omega}$ 영역에 결합시키는 형태로 만들어졌다. 금 안테나와 초전도 안테나의 측정 결과는 이러한 구조를 이용하여 유용한 안테나가 제작될 수 있음을 보여주었다. In applying high-${\underline{T_c}}$ superconducting material to microwave devices, Uncertainty of electromagnetics of high-${\underline{T_c}}$ superconductor(HTS) and the temperature dependence of the substrate fits with HTS thin film cause difficulty in realization of such antenna for industrial applications. It must be noted to characteristic the HTS antenna in contrast with normal conducting counterpart for this real application. In this paper, a comparative study between HTS microstrip antennas and gold antennas was reported in terms of the return loss, the characteristic impedance, efficiency, and other various characteristics. HTS thin films were $YBa_2Cu_3O_{7-x}$ (YBCO) on MgO substrates. Superconducting microstrip antennas used in this work were to directly inset a microstrip transmission line into the 50 ${\Omega}$ region of the radiating patch. Measurement results of HTS antennas and gold antennas showed that usable antennas can be made using this architecture.