다단 브랜치라인으로 구성된 광대역 결합기 설계 및 구현

양두영 한국지식정보기술학회 2020 한국지식정보기술학회 논문지 Vol.15 No.4

In designing the branch line coupler, it is very important to set the impedance of each line because the amount of signal coupling at the output port is determined by the impedance of each line constituting the branch line. Since the coupling coefficient between the input and output ports is determined by the impedance condition of the line in the multi-stage branch line structure, the impedance of each line to obtain the desired coupling coefficient can be obtained by applying even-odd mode circuit analysis. In this paper, the multi-stage microstrip branch line structure is constructed and a hybrid coupling structure is used to distribute the half-power type of circuit lines connected to each port for signal transmission. We also obtained the broadband characteristics by optimizing the width and length of the line impedance to reduce the phase error within the operating range. We also analyzed the influence of the output signal amplitude and phase error on the beam pattern and beam steering direction obtained from the wide band design results of the five-stage branch line coupler. The fabricated hybrid branch line coupler has the operating frequency band of 2.15 GHz to 3.4 GHz, with a relative bandwidth of about 47%. In the band, the transmission characteristic and phase difference between output ports are less than 3.3 ± 0.5 dB and 90±1°. It shows good insertion loss, a half power and wide band characteristics.

「미국의 필리핀에 대한 식민 교육 정책, 1898-1913」 : 자비와 폭력, 동화와 배제, 미국화와 필리핀화의 고차원적 함수 [강원대학교 박사학위논문, 2019]

양두영 역사교육연구소 2020 역사와교육 Vol.- No.19

衛星放送 受信感度 改善을 위한 遲延波構造物 및 電波吸收體 設計

梁斗榮 제주대학교 1993 논문집 Vol.37 No.-

. In this paper, characteristics of the slow wave structure and electromagnetic absorber are analyzed and the design parameter is presented. To improve the broadcasting signal gain and the efficiency, we insert a slow wave structure on the bottom of the upper waveguide which can suppress the grating lobes. Also, we design the slow wave structure to decrease the influence of reflection and analyze the characteristics of the termination absorber. The polystyrene slow wave structure has thickness of 4mm and the relative permittivity of 2.3. we minimize reflection effects using the termination absorber of 5㎝ radius with dielectric constant of 1.14.

자동차 워셔액 및 방향제 착화가능성에 관한 연구

양두영,안영동,정원섭,한상욱 한국화재감식학회 2019 한국화재감식학회 학회지 Vol.10 No.2

Flammability of windshield cleaning solutions and air fresheners is surveyed. Also, the amount of flammable vapor, ignition point and temperature are calculated by using the suggested experiments, which will be useful in the investigation of vehicle fire. When windshield fluid is leaked, source of ignition is applied to the air fresheners in a closed room. Eight experimental specimen are selected for the ignition test. Six thermocouples are applied to the engine compartments to acquire the data of the temperature variation. In addition, reproducible tests are conducted on source of ignition of washer fluid and air fresheners in a sealed room. The risk of washer fluid and air fresheners containing alcohol is reconsidered.

Czochralski 법으로 성장시킨 실리콘 단결정 Wafer에서의 Gettering에 관한 연구

양두영,김창은,한수갑,이희국 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.4

The effects of intrinsic and extrinsic gettering on the formation of microdefects in the wafer and on the electrical performance at near-surfaces of three different oxygen-bearing Czochralski silicon single crystal wafers were investigated by varying the combinations of the pre-heat treatments and the phosphorus diffusion through the back-surface of the wafers. The wafers which had less than 10.9 ppma of oxygen formed no gettering zones irrespective of any pre-heat treatments, while the wafers which had more than 14.1 ppma of oxygen and were treated by Low+High pre-heat treatments generated the gettering zone comprising oxygen precipitates, staking faults, and dislocation loops. The effects of extrinsic gettering by phosphorus diffusion were evident in all samples such that the minority carrier lifetimes were increased and junction leakage currents were decreased. However, the total gettering effects among the different pre-heat treatments did not necessarily correspond to the gettering structure revealed by synchrotron radiation section topograph.

온라인 사목의 미래를 위해 필요한 제도의 역할과 모델

양두영 우리신학연구소 2021 가톨릭 평론 Vol.31 No.-

구형 혼안테나에 인접된 전송선로에 유기되는 부하전류 및 EMI 특성 해석

양두영,채관수,이상설 한국통신학회 1991 韓國通信學會論文誌 Vol.16 No.4

We derive the radiation field equation at the naar field region to analyse EMI by the rectangular horn antenna. The EMI loadk current calculated from the load current induced on the transmission line being close to the rectangular horn antenna using the field theory and the transmission line theory. We find the conditions minimizing the EMI from the load current transfer function of distance, frequency and impedances at sending and receiving end. The smaller sending end impedance, the larger EMI load current and the larger sending impedance, the smaller EMI load current. 구형 혼안테나에 의한 EMI문제를 해결하기 위하여 근거리 영역에 대한 복사 전자계식을 세운다. 전자계 해석 방법과 전송선이론을 적용하여 인접한 전송선 부하에 흐르는 EMI 부하전류를 계산한다. 거리와 주파수 및 송, 수전단 임피던스에 따른 부하전류 전달함수로 부터 EMI의 최소화조건을 찾아낸다. 송전단 임피던스가 작아질수록 EMI 부하전류는 커지고 송전단 임피던스가 커질수록 EMI 부하전류는 작아진다.

타원 여파기를 이용한 마이크로파 집적 광대역 증폭기 설계 ( A Design of the Microwave Integrated Circuit for Broadband Amplifier Using the Elliptic Filter )

양두영,손태호,박병우,이상설 대한전자공학회 1988 대한전자공학회 학술대회 Vol.1988 No.11

구면사각패치 마이크로스트립 공진기 해석

양두영,이상설,Yang, Doo-Young,Lee, Sang-Seol 대한전자공학회 1990 전자공학회논문지 Vol. No.

공진기(cavity)이론을 적용하여 등각면을 이루는 구면사각패치 마이크로스트립 공진기를 해석한다. 후린징전자계(fringing field) 때문에 발생되는 공진주파수의 오차를 줄이기 위하여 실효유전상수를 고려하여 공진주파수를 계산한다. 해석된 결과식에 따라 Epsilam 10기판으로 3GHz에서 동작하는 전송형 구면사각패치 마이크로스트립 공진기를 설계 제작하였다. 측정 결과는 공진주파수 2.985GHz, 반사손실 -44.4dB로써 이론값과 거의 일치하였다. We analyze the spherical-rectangular patch microstrip resonator with conformal surface by the cavity model and derive the formulas to calculate resonant frequency in the consideration of effective dielectric constant in order to minimize the errors of resonant frequency due to the fringing fields. A transmission type spherical-rectangular patch microstrip resonator operating at 3GHz, for example, is designed and fabricated on Epsilam-10 substate. Measuring data of resonant frequency and return loss are 2.985 GHz and -44.4dB respectively. Those well agreed with theoretical values.

미국 식민 체제 정착 과정과 필리핀 초등교육 정책수행의 정치적 함의, 1902-1907

양두영 강원사학회 2019 江原史學 Vol.0 No.33

This paper attempts to clarify the characteristics of the U.S. colonial education policy by analyzing primary education policy in the second phase of the Philippine-American War(1902-1907). To this end, I first analyzed the policy performance of the Americans and the response of the Filipinos over the political issues in the second phase as the background of the policy. After that, I examined the process in which main indexes of primary education at that time expanded, investigated the changes of primary education and their causes, and revealed the political implications contained in it. The precedent researches are based on dichotomous perspectives as part of the Benevolent Assimilation policy or as a tool for military occupation. Beyond that, this paper tries to prove that the colonial education policy was a composite made by the active interaction of different levels of multi-subjects. The U.S. colonial policy could have been a “Benevolent Assimilation” policy for Filipino Federalists who recognized U.S. sovereignty, but the forces struggling for independence were thoroughly ruled out by military repression and legal measures such as Sedetion Law(Violent Elimination). Also, while the colonial authorities did not provide enough support to improve the ability of Filipinos’ autonomy, they succeeded politically with the image of trying to assimilate the Philippines to the United States. Assimilation, in this context, was making the Philippines not a sovereign nation equal to the United States, but a nation subordinated to the United States and American culture spread in it(Violent Americanization). Nevertheless, Filipinos actively embraced, participated in, and supported English education. English was able to play the role of the Filipino as a common language that united all Filipinos over tribes in the Philippines, which was divided into various tribes. In this respect, English education was a part of the “Benevolent Filipinization” policy. After all, the U.S. colonial education policy was a complex product created by the dual interaction of antinomic purposes and personalities. 본 논문은 미국-필리핀 전쟁 제2국면(1902-1907)에서 추진된 초등교육 정책 분석을 통해 미국 식민 교육 정책의 성격을 밝혀 보고자 하였다. 이를 위해 먼저 제2국면의 주요 정치적 이슈를 둘러싸고 나타난 미국인들의 정책 수행과 필리핀인들의대응을 배경적 측면에서 분석하였다. 이어서 본격적으로 해당 시기 초등교육의 주요초등교육 지수가 확대되는 과정을 고찰하고, 초등교육 변화 양상과 원인, 그 속에담겨있는 정치적 함의를 규명하고자 하였다. 본 논문은 식민 교육 정책을 ‘자비로운동화’(Benevolent Assimilation) 정책의 일환으로 보거나 군사 점령의 도구로 보는등 이분법적 관점에 머물러 있는 기존 연구를 넘어, 층위가 다른 다중 주체의 능동적상호작용이 만들어내는 복합물이었음을 증명하고자 하였다. 미국의 식민 정책은 미국의 주권을 인정하는 필리핀 연방당 인사들에게는 자비로운 동화 정책일 수 있었지만, 독립을 위해 투쟁하는 세력에게는 군사적 진압과선동법 등의 법적 조치를 통한 ‘폭력적인 배제’(Violent Elimination) 정책이었다. 또한 식민 당국은 필리핀인들의 자치 능력 향상을 위해 충분한 지원을 하지 않았지만, 필리핀을 미국에 동화시키려고 노력한다는 이미지를 획득하며 정치적으로성공하였다. 여기서 동화란 미국과 동등한 주권 국가로 민주주의를 향유하는 것이아니라 미국식 문화가 확산되고 미국에 종속되는 ‘폭력적인 미국화’(ViolentAmericanization)를 말하는 것이었다. 그럼에도 불구하고 필리핀인들은 미국의 영어교육과 학교교육을 적극 수용하고 참여하며 지원하였다. 영어는 다양한 부족어로분리되어 있던 필리핀의 특수한 상황에서 부족을 넘어 전체 필리핀인들을 하나로묶어주는 공용어로서의 ‘필리핀어’의 역할을 수행할 수 있었다. 이런 면에서는 영어교육이 ‘자비로운 필리핀화’(Benevolent Filipinization) 정책의 일환이었다. 결국 미국의 식민 교육 정책은 다중주체와 결합하여 이율배반적 목적과 성격의 이중적상호작용으로 만들어낸 복합적인 생산물이라고 할 수 있다.