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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) 한국정보전자통신기술학회 2024 한국정보전자통신기술학회논문지 Vol.17 No.2
본 논문에서는 근거리에 존재하는 타겟의 거리 정보를 탐지할 수 있는 간단한 구조를 제안하고 직관적으로 시영역에서 초광대역 신호를 추출하는 방법에 대해 기술하였다. 제안된 임펄스 레이더 시스템은 임펄스 발생회로, 초광대역 송수신 안테나 및 함수 발생기, 디지털 오실로스코프로 구성된다. 10MHz의 정현파를 입력 신호로 인가하였을 때 발생되는 신호의 펄스폭은 200ps 및 주파수영역에서 0.3GHz에서 4.7GHz의 대역을 점유하는 일차 미분된 가우시안 펄스임을 측정을 통해 확인하였다. 동일한 초광대역 송수신 안테나를 활용하여 수신하였을 때 신호는 펄스폭이 328ps 및 스펙트럼은 0.9GHz에서 4.4GHz의 대역을 점유하는 가우시안 더블릿의 형태의 초광대역 신호로 측정되었다. 반경 4cm 정도의 원형 금속 물질과 코너 리플렉터를 타겟으로하여 일정 거리 만큼 이격하였을 때 실 타겟의 위치정보를 추출함을 실험을 통해 확인하였다. This paper presents the method to extract the ultrawide-band (UWB) signal and proposes the simple impulse radar system for sensing real-based target within close-range area. The proposed impulse radar system consists of impulse generator, ultrawide-band antennas, function generator, and digital oscilloscope. It is verified by experiment that a differentiated Gaussian pulse is generated with 200ps of pulse width and corresponding spectrum from 0.3 to 4.7 GHz once a sinusoidal wave with 10MHz is excited. The Gaussian doublet is received by identical antennas and it is shown that the UWB pule width of 328ps and its spectrum is from 0.9 to 4.4 GHz. It is confirmed that the UWB pulse is extracted when the real-based targets such as circular target with 4cm radius and corner reflector are placed at the close-range area.