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영구자석 진동에 기인한 HEV용 구동모터 이상 전자기 소음의 실험적 규명
김명규(Myunggyu Kim),하재원(Jaewon Ha),김대운(Daewoon Kim),김삼균(SamKyun Kim),김연호(Yeonho Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper investigates the abnormal electromagnetic noise of HEV traction motor due to Vibration of Permanent Magnet. In the paper, we introduce the mechanical and electromagnetical cause of magnetic unbalance of the HEV tranction motor and analyze the frequency of abnormal electromagnetic noise due to magnetic unbalance. We determine the abnormal electromagnetic noise is caused by the vibration of permanent magnet. And we develop the novel magnet insert method of HEV traction motor and improve the abnormal electromagnetic noise of HEV traction motor.
기판 집적 도파관을 이용한 아날로그 페라이트 위상 천이기
임명규(Myunggyu Yim),변진도(Jindo Byun),이해영(Hai-Young Lee) 한국전자파학회 2011 한국전자파학회논문지 Vol.22 No.4
기존의 수동 위상 배열 시스템에 사용되는 구형 도파관(rectangular waveguide)을 이용한 아날로그 페라이트 위상 천위기는 높은 전력 취급 능력을 갖는 반면에 무겁고 높은 제작 비용을 갖는다. 본 논문에서는 PCB 제작공정을 이용하여 낮은 제작 비용으로 쉽게 제작이 가능한 기판 집적 도파관(SIW)을 이용한 아날로그 페라이트 위상 천위기를 제안한다. 본 제안 구조는 페라이트를 삽입할 부분의 유전체를 제거하고, 그 부분에 페라이트를 삽입하여 제작하였다. 측정 결과, 중심 주파수 14.05 ㎓에서 최대 5.1° / ㎜ 위상 변화를 관찰하였으며, 12.9 ㏈ 이하의 반사 손실의 변화를 관찰하였다. 본 제안 위상 천이기는 위상 배열 시스템의 경량화 및 저가격화에 중요한 역할을 할 수 있을 것으로 기대한다. Analog ferrite phase shifters based on rectangular waveguides which are used as component of passive phased array system have high power handling capability, but it is heavy and has high cost to fabricate. In this paper, we propose an analog ferrite phase shifter using substrate integrated waveguide(SIW), which has low cost and is easy to fabricate because it uses printed circuit board(PCB) process. The proposed structure is fabricated by using centeral dielectric material removal for inserting a ferrite bar. The measured results show that the proposed structure has not only 5.1° / ㎜ phase variation but also return loss variation under 12.9 ㏈. Therefore, it is expected that the proposed phase shifter can plays an role to reduce weight and to has low cost on the phased array system.
송명규(MyungGyu Song),김병량(ByungRyang Kim) 한국지역개발학회 2001 韓國地域開發學會誌 Vol.13 No.1
So many ecovillages are springing up like mushrooms after a rainfall all over the world. Generally, they are oriented to ecocentrism and holism eco-philosophically, and accept bioregionalism as their ideological base, explicitly or implicitly. This study examines bioregionalism. Bioregion is a geographical area whose rough boundaries are determined by non-human, rather than human, forces. Bioregions are distinguished from another by the characteristic flora, fauna, climate, soils, landforms and the human settlements and cultures to which these features give rise. Bioregionalism seeks to repair the torn fabric of life and to re-connect broken relations among people, ecosystem, and place. Bioregionalism is based on Aldo Leopold`s ecocentric and holistic land ethic and attempts to practice it on a bioregion. The bioregionalistic way of life is expected to be best carried on in an ecovillage.
김명규(Myunggyu Kim),양일식(Ilsik Yang),손지연(Ji-Yeon Son),박준석(Jun Seok Park) 한국정보기술학회 2005 한국정보기술학회논문지 Vol.3 No.1
Today the digital multimedia technology results in the broad use of the portable media renderers such as MP3 player. In this paper, we present the technology of sharing the local audio contents over multiple users. Here the local audio contents are located at an user player storage. In order to share the single audio source over multiple sink devices, we use the Bluetooth stereo audio streaming technology. We propose and implement the extended A2DP (eA2DP) from the standard Bluetooth Advanced Audio Distribution Profile (A2DP) in order to support the mechanism of sharing single stereo audio over multiple users.