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Inverse Continuous Wavelets Filter Bank System
Ig-hyun Cho,Seung-houn Lee,Dong-han Yoon 한국정보기술학회 2006 한국정보기술학회논문지 Vol.4 No.6
This paper is contributed to the inverse continuous wavelets filter bank system. The inverse continuous wavelets transform permits to reconstruct a signal if the admissibility condition is satisfactory. Then we can obtain the new time-scale plan which is composed by a real amplitude and the scale information of a signal. This plan can be considered as an analysis filter bank system. On the other hands the original signal can be reconstructed by the simple summation of the plan. This process can be considered as a synthesis filter bank system. In this work we have been tried to establish the inverse continuous wavelets filter bank system and applied to remove noise in Ultrasonic signal.
Inverse Continuous Wavelets Filter Banc System
Ig Hyun CHO,Seung Houn LEE,Dong Han YOON 한국정보기술학회 2006 Proceedings of KIIT Conference Vol.2006 No.-
This paper is contributed to the inverse continuous wavelets filter banc system. The inverse continuous wavelets transform permitsto reconstruct a signal if the admissibility condition is satisfactory. Then we can obtain the new time-scale plan which is composed by a real amplitude and the scale information of a signal. This plan can be considered as an analysis filter banc system. On the other hands the original signal can be reconstructed by the simple summation of the plan. This process can be considered as a synthesis filter banc system. In this work we have been tried to establish the inverse continuous wavelets filter nab system and applied toremove noise in Ultrasonic signal.
조익현(Ig-hyun Cho),전후동(Hoo-dong Jeon),김준대(Jun-dea Kim),백청택(Chung-taek Baik),박상우(Sang-woo Park),윤동한(Dong-han Yoon) 한국정보기술학회 2007 Proceedings of KIIT Conference Vol.2007 No.-
본 연구는 외부전극 형광램프를 구동하기 위한 인버터를 제작하였다. 인버터의 구동방식은 Half- Bridge 방식과 Full-Bridge 방식을 사용하여 단일램프 특성과 멀티램프 특성을 비교하였다. EEFL의 전기적 특성을, 전압, 선류, 주파수, 효율에 따라 분석하였고 전기적 실험 조건을 제시하였다. This research manufactured inverter to run external electrode fluorescent lamp. Drive method of inverter compared single lamp characteristic and multi lamp characteristic using Half-Bridge method and Full-Bridge method. Analyzed electrical special quality of EEFL by voltage, current, frequency, efficiency and presented electrical experiment condition.
조익현(Ig-hyun Cho),권창영(Chang-young Kwon),김정삼(Jung-sam Kim),이충호(Choong-ho Lee),윤동한(Dong-han Yoon) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.4
Many digital filters have been designed previously to eliminate powerline interface, broadband noise, baseline wondering and electromyogram interface in the electrocardiogram. This paper describes filtering methods which have been developed - notch, LMS(Least Mean Square) adaptive filter, and a nonlinear adaptive noise canceller using neural network proposed in this paper. The recurrent neural network(RNN) is used as nonlinear adaptive filter in the various fields. Experimental results shows that the neural network based noise canceller outperforms the linear one. And this paper describes nonlinear dynamics in ECG processing to verify that the neural network based adaptive filter performs best with respect to noise rejection and attractor pattern.
조익현(Ig-hyun Cho),이충호(Choong-ho Lee),권창영(Chang-young Kwon),김준대(Jun-dea Kim),윤동한(Dong-han Yoon) 한국정보기술학회 2007 Proceedings of KIIT Conference Vol.2007 No.-
이 논문은 신호 f(t)의 실제적인 스케일 정보를 나타내는 웨이브렛 플랜을 중심으로 연속 웨이브렛 역변환의 특성에 대하여 논하였다. 웨이브렛 변환에 비해 역변환의 적용이 상대적으로 미비한 이유는 수치적인 연산의 복잡성에 기인한 것이며, 이 논문은 웨이브렛 역변환의 안정된 복원을 위한 방법에 대하여 연구하였다. 웨이브렛 역변환이 안정적으로 실현될 경우 신호 f(t)에 대한 실제적인 스케일 정보를 지니고있는 웨이브렛 플랜 이라는 새로운 “시간-스케일” 공간을 구할 수 있으며, 이는 완전한 멀티 필터 뱅크 시스템과 동일한 특성을 나타낸다. 즉 연속 웨이브렛 변환을 통해 신호 f(t)의 모든 스케일 성분을 독립적으로 주파수 전체 대역에 걸쳐 분산하고 다시 역변환을 통해 원래의 신호를 복원하는 과정은 필터뱅크이론의 분석(analysis)과 합성(synthesis) 과정과 일치한다. 이 논문에서는 연속 웨이브렛 역변환을 이용하여 “시간-스케일” 필터를 통한 신호 f(t)의 스케일 분해와 웨이브렛 멀티 필터 뱅크이론에 대하여 논하였다. This paper is contribute to Inverse continuous wavelets transform which permits to determine real “time-scale” plan. The application of Inverse wavelets transform is not yet represented because of the numerical difficulty. If the signal can be reconstructed stably by Inverse Continuous Wavelets Transform, the multi scale filter bank system which composed by analysis and synthesis process can be designed. In this work, we represent the Inverse Continuous Wavelets Transform which leads to nearly perfect reconstruction of signal and the multi-scale filter bank system.
웨이브렛 변환을 이용한 비정상 신호의 순간 주파수 결정
조익현(Cho, Ig-hyun),이인수(Lee, In-Soo),윤동한(Yoon, Dong-han) 한국정보전자통신기술학회 2009 한국정보전자통신기술학회논문지 Vol.2 No.2
비선형적인 위상 변화를 지닌 비정상(non-stationary)신호는 레이더(Radar), 통신(telecommunication), 생체공학, 지질탐사, 음향 등 여러 분야에서 쉽게 접하는 신호이다. 비정상신호는 일반적으로 시간에 따라 신호의 물리적 특성이 변화하는 신호를 의미하며, 순간 주파수는 신호의 특정시간에 해당하는 신호의 주파수를 의미한다. 이 논문에서는 순간 주파수를 결정하기 위한 연속 웨이브렛 변환의 적용에 대하여 논하였다. The analysis of Radar signal, telecommunication, bioengineering, seismic, and acoustic signal is consist of the Non-stationary signal which has non-linear phase variation. Non-stationary signal means that the physical properties of signal depend on time variation and the instantaneous frequency represents physical property of these type of signal. Thus estimation of the instantaneous frequency of non-stationary signal is important subject in signal processing. In this work, the instantaneous frequency analysis method utilizing continuous wavelets transform is represented and compared with Hilbert Transform method.
고명암비를 갖는 Full-HD AC PDP 구동파형 설계
조익현(Ig-hyun Cho),권창영(Chang-young Kwon),이충호(Choong-ho Lee),김정삼(Jung-sam Kim),윤동한(Dong-han Yoon) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.3
This paper proposes a driving waveform with high contrast ratio for Full-HD AC plasma display panel(PDP). The proposed driving waveform is based on the selective writing method for driving an AC PDP, and can drive an Full-HD(1920x1080pixels) AC PDP without physically modifying the panel structure. For the conventional driving waveform, all PDP cells are reset by the ramp waveform with positive dark discharge and negative dark discharge, during all sub-fields of one frame. For the proposed driving waveform, during the first sub-field of one frame, all PDP cells are reset by the conventional ramp waveform, during the other sub-fields, all cells is reset by negative dark discharge and a narrow weak discharge. The conventional driving waveform is difficult to drive Full-HD AC PDP within 1.2us scan width, otherwhile the proposed driving waveform can realize to drive Full-HD AC PDP using scan pulse width as narrow as 0.7㎲ with 5000:1 high contrast ratio.