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자율이동체의 위치인식을 위하여 적용된 자이로스코프의 오차보정에 관한 연구
정준영,김지현,김상권,김판돌,이홍원 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
Recently, the piezoelectric vibrating gyroscope, as more stable and accurate directional sensor, is attracting attention in the position pointering of car or robot navigation systems, but its output characteristics of sensitivity and linearity can be easily affected by ambient temperature or changed with time-going. This paper describes a simple and effective output calibration method of the piezoelectric vibrating gyroscope which is appiled to the autonomous vacuum cleaner for its direction pointering. Through experimental results, it is verified that proposed method reduces about 1.5% of accumulated angle error to below 0.1% when the robot drives on a floor. With this calibration method, it is possible to use the piezoelectric vibrating gyroscope in position recognition system with low cost and high accuracy.
정준영,김태균,배재휘,이재호,조용성,라상중,최동준,Jung, J.Y.,Kim, T.K.,Bae, J.H.,Lee, J.H.,Cho, Y.S.,La, S.J.,Choi, D.J. 한국전자통신연구원 2015 전자통신동향분석 Vol.30 No.3
케이블방송망은 광대역을 가진 유선망이라는 매체 특성으로 동일한 망을 이용하여 방송뿐만 아니라 통신까지 제공할 수 있는 양방향 방송서비스를 가능케 하는 방송통신 융합을 위한 최적의 망으로 거론되고 있다. 서비스 관점에서 케이블방송망은 도입초기 단순히 지상파 방송의 난시청 해소를 위한 수단이었으나 프로그램 공급업자와 종합 유선 방송국의 등장으로 독립적인 방송 매체로 발전하였으며, 북미 주도하에 1990년대 중반 통신법이 개정된 이후 양방향 고속 데이터서비스를 제공할 수 있는 방안으로 케이블 모뎀(CM: Cable Modem)을 개발하여 방송과 통신을 동시에 수용하는 통합망으로 발전시켜왔다. 최근 케이블방송은 전송 효율 고도화, 망 구조적 진화 및 대용량 콘텐츠 전송으로 크게 3개의 방향으로 발전을 거듭하고 있다. 본고에서는 각 발전 방향에서 제시하는 차세대 케이블방송의 기술개발 및 표준화 동향에 대해 살펴보고자 한다.
정준영,김교창,김도영,도대홍 충북대학교 농업과학기술연구소 1995 農業科學硏究 Vol.12 No.2
Derivation of reasonable design rainfall was attempted by comparative analysis of design rainfall derived by frequency analysis of Type I extremal distribution and probability plotting technique for annual maximum 1-day, 1-hour and 10-minute rainfalls observed at Cheong Ju. The results were analyzed and summarized as follows : 1. Basic statistics were calculated for the analysis of Type I extremal distribution with annual maximum 1-day, 1-hour and 10-minute rainfalls at Cheong Ju. 2. Necessary parameters were derived by frequency analysis of Type I extremal distribution for annual maximum 1-day, 1-hour and 10-minute rainfalls at Cheong Ju. 3. Design annual maximum 1-day, 1-hour and 10-minute rainfalls in mm were derived by frequency analysis of Type I extremal distribution and probability plotting technique respectively at Cheong Ju. 4. Design annual maximum 1-hour and 10-minute rainfalls were derived by frequency analysis of Type I extremal distribution and probability plotting technique are shown to be much closer to the observed data but design annual maximum 1-day rainfall is not to be closer to the observed data. 5. Design annual maximum rainfalls following the duration derived by Type I extremal distribution are seemed to be more reasonable than those of probability plotting technique owing to the difference of individual eyefitting.