Ka-밴드 Fin-line 필터의 설계 및 제작에 관한 연구

유기한(Ki-Han Ryu),이용민(Yong-Min Lee),최진일(Jin-Il Choi),박종화(Chong-Wha Park),강준길(June-Gill Kang),나극환(Keuk-Whan Ra) 한국방송·미디어공학회 1998 방송공학회논문지 Vol.3 No.1

Fin-line 구조를 이용한 밀리미터파 필터의 설계 및 제작

유기한(Ki-Han Ryu),이용민(Yong-Min Lee),김재원(Jae-Won Kim),나극환(Keuk-Whan Ra) 한국통신학회 1998 한국통신학회 학술대회논문집 Vol.1998 No.7

전력케이블 열화 감시방안에 관한 연구

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.

자궁경부 종양에서 p53, Proliferating Cell Nuclear Antigen(PCNA), c-myc 및 Epidermal Growth Factor Receptor(EGFR)의 발현

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.

미생물 혼합처리가 토양의 미생물상과 이화학적 특성 및 시설 채소 생육에 미치는 영향

류일환 ( Il Hwan Ryu ),유기용 ( Ki Yong Yoo ),노석초 ( Seog Cho Lo ),한성수 ( Seong Soo Han ) 한국환경농학회 2008 한국환경농학회 학술대회집 Vol.2008 No.2

홀로그래피의 기술을 이용한 3차원 TV 시스템에 관한 연구

형창희(Chang-Hee Hyoung),유기한(Ki-Han Ryu),김규태(Kyu-Tae Kim),이상이(Sang-Yi Yi),김은수(Eun-Soo Kim) 한국통신학회 1994 한국통신학회 학술대회논문집 Vol.1994 No.11

운동강도의 차이가 초등학생의 뇌파와 학습능력에 미치는 영향

이동규 ( Dong Kyu Lee ),한은상 ( Eun Sang Han ),유기범 ( Ki Bum Ryu ) 서울敎育大學校 初等敎育硏究所 2016 한국초등교육 Vol.27 No.1

본 연구는 운동강도에 따라 초등학생의 뇌파와 학습능력에 어떠한 차이가 있는지를 밝혀 초등학생 뇌 활성화 연구의 기초자료로 활용하고자 한다. 연구의 목적을 달성하기 위해 S초등학교 초등학생 4~5학년 42명을 대상으로 남녀 7명씩 고강도 운동군, 중강도 운동군, 비활동 대조군으로 실험을 진행하였다. 피험자는 안정 상태에서 학습능력과 뇌파를 측정하고 운동 처치 후같은 조건(체온, 심박수)에서 재측정 하였다. 측정된 데이터는 사전 측정값을 공변량으로 하여 SPSS 18.0을 이용하여 ANCOVA를 실시하였다. 연구결과 고강도 운동군의 뇌파 활동은 좌뇌의 Alpha파(2.845a±0.88, p<.01), SMR파(3.474a±0.22, p<.01), M-Beta파(3.746a±0.12, p<.01), H-Beta파(3.431a±0.17, p<.05), Gamma파(5.065a±0.20, p<.01)에서 유의한 차이가 나타났다. 우뇌는 M-Beta파(2.649a±0.32, p<.01), H-Beta파(2.344a±0.31, p<.01), Gamma파(2.247a±0.26, p<.05)에서 유의한 차이가 나타났다. 중강도 운동군의 뇌파 활동은 모든 영역에서 비활동 대조군과 유의한 차이가 나타나지 않았다. 고강도 운동군은 인지강도(58.255a±1.71, p<.01), 집중력(84.640a±2.05, p<.05), 학습종합능력(49.839a±1.80, p<.05)과 작업부하도(48.945a±1.03, p<.05)에서 유의한 차이가 나타났다. 결과적으로 고강도 운동의 뇌파는 좌뇌의 Alpha파, SMR파, M-Beta파, H-Beta파, Gamma파의 활동에서 유의한 차이가 나타났다. 우뇌는 M-Beta파, H-Beta파, Gamma파에서 유의한 차이가 나타났다. 중강도 운동군은 모든 영역에서 비활동 대조군과 유의한 차이가 없었다. 고강도 운동군 학습능력에서는 인지강도, 집중력, 학습종합능력, 작업부하도에서 유의한 차이를 보였다. 따라서 고강도 운동은 뇌파를 활성화 시키고 학습능력을 향상시키는 것으로 사료된다. The purpose of this study was to provide the basic data to the elementary students’ brain activation study through the result of different intensity affects elementary school students’ EEG and learning ability. To accomplish the purpose of this study, 4th~5th grade 42 students in S elementary school are divided into high-intensity group, moderate-intensity group and control group by 7 boys and girls. Students are measured their learning ability and EEG in a stable state and after exercise they are remeasured in a same condition(temperature, heart rate). Measured data is done through ANCOVA using SPSS 18.0 advanced measurement covariance. High-intensity group’s cognition strength(58.255a±1.71, p<.01), concentration(84.640a±2.05, p<.05), learning capability(49.839a±1.80, p<.05) are improved and workload(48.945a±1.03, p<.05) is lowered. High-intensity group’s α-wave(2.845a±0.88, p<.01), SMR-wave(3.474a±0.22, p<.01), Mid β-wave(3.746a±0.12, p<.01), Highβ-wave(3.431a±0.17, p<.05) and γ-wave(5.065a±0.20, p<.01) in left-brain increased and Midβ-wave(2.649a±0.32, p<.01), Highβ-wave(2.344a±0.31, p<.01) and γ -wave(2.247a±0.26, p<.05) in right-brain increased. Moderate-intensity group and control group’s results are almost the same in all areas, so there’s no exercise effect. As a result, there was a significant difference among α-wave, SMR-wave, Midβ-wave, Highβ-wave and γ-wave in left-brain and Midβ-wave, Highβ-wave and γ-wave in right-brain after exercise with a high intensity. There was no significant difference between moderate-intensity group and control group. There was a significant difference in cognition strength, concentration, learning capability, workload in high-intensity group. Consequently it is considered that high-intensity exercise affect activation of EEG and improvement of learning ability.

뇌 기반 운동 프로그램 참여가 초등학생의 융합인재소양에 미치는 영향

이동규 ( Lee Dong Kyu ),한은상 ( Han Eun Sang ),유기범 ( Ryu Ki Bum ) 서울敎育大學校 初等敎育硏究所 2017 한국초등교육 Vol.28 No.1

이 연구는 뇌 기반 학습이론에 기초한 초등학생 운동 프로그램을 ADDIE 모형(Seels & Richey, 1994)에 따라 개발하여 서울의 K구 S초등학교 40명의 학생에게 적용하였다. 최유현 등(2013)이 개발한 융합인재소양 검사지를 이용하여 효과를 검증하였으며 주요 연구 결과는 다음과 같다. 첫째, 뇌 기반 운동프로그램에 참여한 학생들의 융합인재소양 수준이 높아지는 것으로 나타났다. 뇌 기반 운동 프로그램에 참여한 실험집단과 참여하지 않은 통제집단의 융합인재소양의 변화를 알아보기 위해 집단별로 대응 t-test를 한 결과 실험집단의 사후검사에서 융합인재소양의 평균값이 통계적으로 유의한 수준(t=-3.60, p<.01)으로 증가하였고 하위요인들은 창의성(t=-2.46, p<.05)과 소통(t=-3.16, p<.01)요인에서 유의하게 증가하였다. 둘째, 뇌 기반 학습 이론에 기초한 운동프로그램의 융합인재소양 수준은 참여 학생과 미참여 학생간의 유의한 차이를 보였다. 실험집단과 통제 집단을 대상으로 융합인재소양 값과 각 하위요인별 사후 값을 독립 t-test한 결과 뇌 기반 운동프로그램은 융합인재소양을 유의미한 수준에서 변화시키는데 효과가 있는 것으로 나타났으며(t=2.45, p<.05), 하위 요인에서는 소통(t=2.67, p<.05)과 융합(t=2.09, p<.05)요인에서 유의하게 높았다. In this study, the elementary school students` exercise program based on the brain-based learning theory was developed and applied using the ADDIE model (Seels & Richey, 1994), and then the effect was verified by using the STEAM literacy test paper developed by Choi Yoo Hyun et al. (2013). The main results are as follows. First, it showed that students who participated in the brain-based exercise program had improved the level of the STEAM literacy. The paired sample t-test was performed to see the change of the STEAM literacy in the experimental group participating in the brain-based exercise program and the non-participating control group. The control group showed a slight increase in the mean value of the STEAM literacy acquisition in the post-test, but there was no statistically significant difference. On the other hand, in the case of the experimental group, the mean value of the STEAM literacy acquisition was increased to a statistically significant level(t =-3.60, p<.01) in the post test. The mean value of all the sub factors was increased, but only Creativity(t =-2.46, p<.05) and Communication(t =-3.160, p<.01) were statistically significant. Second, the STEAM literacy level of the exercise program based on the brain-based learning theory showed a significant difference between participating and non-participating students. Independent t-test of the Convergence value and the Communication value of each sub-factor for the experimental group and the control group showed that the brain-based exercise program was effective in changing the level of the STEAM literacy at a meaningful level(t =2.45, p<.05). The sub -factors of convergent the STEAM literacy were found to be effective in increasing communication(t =2.67, p<.05) and convergence(t =2.09, p<.05).