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이두진(Doojin Lee),이수민(Sumin Lee),김남균(Namgyun Kim),진종학(Jonghak Jin),김성규(Seongkyu Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Redundant steering is a key technology for automated driving. The Electric Power Steering(EPS) system with fail-operational function enables either a driver or auto pilot system to make a safe stop in the rare case of a single failure. Mando developed a dual invertor system equipped with one actuator as the redundant steering system. In the case of single inverter, only 3 bus bars are needed. But the actuator needs 6 bus bars to connect the dual invertor. This means that when designing system, not only the distance from bus bar to magnetically sensitive Integrated Circuit (IC) but also the arrangement of bus bars are taken in account. In this paper, the optimized arrangement of 6 bus bars is proposed through static magnetic analysis to minimize the influence of the magnetic-sensitive IC Motor Position Sensor(MPS)bus. Frist define the design process, then analyze the magnetic field distribution based on the bus bar array combination table.
“주변적” 존재로의 회귀 - 에밀리 디킨슨의 생태학적 상상력
이두진(Doojin Lee) 19세기영어권문학회 2010 19세기 영어권 문학 Vol.14 No.1
The purpose of this essay is to elucidate the ecological traits of Emily Dickinson's nature poetry, and to show that her creative mind in the nature poems is activated through her ecological imagination. In most of her nature poems she draws the picture of diverse natural things, and her imagination moves to recognize their diversity, equality, and spontaneity. The humanistic view of nature has long been so reason-oriented that it is considered as having the hierarchial order in it and its diversity is overlooked by man. Dickinson refutes the established view of nature, and her ecological imagination in her nature poems starts to praise the diversity of nature and leads to the recognition of the “circumferential” beings in the natural world. In the process, she also finds the equality of all existences residing in nature, including man who has considered it as the object to be conquered, and, furthermore, cherishes the spontaneity of nature in which all natural beings are in the state of self-sufficiency. In that respect, her ecological imagination can be qualified as a return to the circumferential beings.
이두진(Doojin Lee),고봉진(Bong Jin Ko) 한국정보전자통신기술학회 2024 한국정보전자통신기술학회논문지 Vol.17 No.1
본 논문에서는 임펄스 유사 신호 복사를 위한 안테나 설계 방법에 대하여 기술하였다. 임펄스 유사 신호의 스펙트럼은 수GHz의 대역을 가지는 파형으로 안테나의 설계도 광대역에 걸쳐 동작할 수 있도록 설계됨과 동시에 근거리 임펄스 레이더 응용에 활용되기 위해서는 시영역에서의 복사 펄스를 반영한 설계가 필요하다. 시영역에서의 복사 펄스 특성을 반영한 비발디 안테나를 설계하였고 안테나의 특성을 주파수 영역 및 시영역에서 검증하였다. 설계된 안테나는 약 1.8GHz에서 10GHz 이상의 광대역을 거쳐 동작함을 확인할 수 있으며 안테나의 입력임피던스는 1GHz 이후부터 10GHz까지 광대역에 걸쳐 100 Ω에 유사한 값으로 안정적으로 수렴함을 측정 및 시뮬레이션을 통해 확인할 수 있다. 전방향으로 복사되는 파형의 특성을 시영역에서 30도 간격으로 확인하였으며 안테나로부터 복사되는 파형은 지향성을 가짐을 확인하였다. 본 연구의 결과는 근거리 탐지 응용분야와 같은 지표투과레이더 설계에 활용 가능할 것으로 보인다. In this paper, the method to design the antenna, which is suitable for an impulse-like waveform radiation, is presented. In general, the impulse-like waveform has its spectrum of around sub GHz bandwidth and the antenna should be properly designed for not only operating wide-bandwidth also reflecting the time domain characteristics for near-zone impulse radar applications. In this regard, Vivaldi antenna has been designed and characterized in terms of short-pulse radiating aspects in the time domain and verified by measured results. The designed antenna has shown to be operating within wide-bandwidth and to be stable for the input impedance from 1.8 to more than 10GHz. The far-zone radiating waveform has been investigated on each plane at the interval of 30degree and the designed antenna has shown to be a directive characteristic. It can be seen that those results proposed are widely applicable to the near area sensing applications such as ground-penetrating radar.