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디지털 지상파 TV 8-VSB 방식의 채널등화기 성능 개선에 관한 연구
김철민,박성우,김대진 전남대학교 전자통신기술연구소 2001 전자통신기술논문지 Vol.4 No.1
In this paper, we proposes the structure of decision feedback equalizer doing update of coefficient substituted LMS algorithm for kalman algorithm for channel equalizer on 8-VSB transmission system. The convergence speed of LMS algorithm is slow for portable, pedestrian, mobile reception where exist multipath, in fact, it is insufficient that LMS algorithm solves the problem of current 8-LMS system. On the contrary, kalman algorithm will show the very strong performance in multipath channel because convergence is realized theoretically at repetition in two times of tap numbers, convergence speed is fast and residual error is smaller than that of LMS algorithm.
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고출력밀도 모터 설계를 위한 헤어핀 권선의 권선법과 Skew Effect 전자기적 특성 연구
김철민,김기찬 한국콘텐츠학회 2023 한국콘텐츠학회논문지 Vol.23 No.10
In this paper, a comparative model with an expanded distribution coefficient based on an electric vehicle driving motor with hairpin winding applied and a Skew stacked structure model were compared and analyzed. When the distribution coefficient is increased by expanding the number of slots per pole of the hairpin winding, the THD reduction of no-load counter-electromotive force due to the increase in the number of slots per pole is greater than the THD reduction through the increase of Skew Angle. At load, Skew Angle tends to increase torque ripple above a certain angle, but torque ripple decreased with a significant increase in the number of slots per pole. However, in the case of the analysis model of this paper, when the number of slots per pole was increased by more than 6, the phase current for torque generation increased by more than 20%. Therefore, the hairpin winding can expand the winding design width of an electric vehicle driving motor with a high power density compared to the round type winding method. In addition, it can be applied together with the Skew stacking structure to make a detailed design to reduce current consumption and harmonics.
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두 대의 압축기를 적용한 에어컨의 오일분배 특성에 관한 실험적 연구
김철민,황윤제,정백영 대한설비공학회 2003 설비공학 논문집 Vol.15 No.2
The common accumulator was designed for solving the maldistribution problem of oil at the air conditioning system with two compressors. The oil level inside two compressors was visualized by using a common accumulator on the various operating conditions. As a result of the visualization, oil distribution inside two compressors was achieved appropriately according to the capacity of each compressor. Uniform distribution of oil was also accomplished at on and off operation condition.
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코로나19 회복패턴의 국제적 비교:개발도상국과 선진국의 차이점 분석
김철민 한국지역개발학회 2023 韓國地域開發學會誌 Vol.35 No.3
This study examines how shock and recovery patterns from COVID-19 across 130 countries. To investigate the patterns, we used Google’s Community Mobility Report. The patterns were classified into three categories: First, developed countries in North America and Europe saw a Z-shaped pattern. Second, developing countries in Asia and Latin America showed a slow recovery with a mix of V-shaped and U-shaped patterns. Finally, many underdeveloped countries in Africa and the Middle East were analyzed as exhibiting a W-shaped pattern of repeated shocks and recoveries. The results of this study may contribute to future international policy development.
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