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김명기,임영도 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.1
A method on the hardware implementation of the Finite Impulse Response (FIR) digital filter using Digital Quarter Square Multiphcation (DQSM) algorithm is proposed. ROM requirement can be reduced by using the double precision algorithm and the absolute value circuit, and also execution speed can be improved by reducing logic level steps of absolute value circuit. The frequency response of FIR digital filter implemented by the above method is quite agreeable with the frequency response simulated by Remez exchange algorithm. If coefficients should be stored in the RAM instead of the ROM, this method is especially useful in the case of FIR digital filter with time varying coefficients.
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웨이브 디지탈 필터의 체계적인 스케일링 절차에 관한 연구
金明起,權熙勳 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.1
In implementing a digital filter with fixed-point arithemetic, additions may cause overflows to occur. In order to avoid overflows, the input signal may be attenuated suitably so that no overflows occur at any point in the filter. But this results in a low output signal-to-noise ratio. Lp Norm is the theoretical basis for scaling the signal level at different node in a digital filter to avoid overflows. The purpose of this paper is to describe a systematic procedure for scaling wave digital filter to avoid overflow problems while maintaining a signal-to-noise ratio as large as possible. The scaled WDF have an improved signal-to-noise ratio over unscaled WDF without overflow.
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金明起 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.1
Recently, it is required to develop OCR(Optical Character Reader) along with the progress of the information processing system for Hangeul. Characters have to be recognized clearly so that OCR can be applied. Structure analysis method and lump method are used for the recognition of characters, and OCR using these two methods is now available for the recognition of printed characters and handwritten alphanumeric characters having simple structure. However, it is known that there should be much more study on the development of handwritten Hangeul's OCR. This paper proposed a new method for the recognition of Hangeul character. The proposed method is that the character units of Hangeul are separated and then recognized from the utilization of the position-information of Hangeul's units obtained from the normalized patterns.
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스펙트럼 擴散 多重接續(SSMA) 受信 方式의 채널간 干涉 除去에 관한 硏究
金明起,邊健植 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2
It is known that conventional spread spectrum communication systems have a characteristics of nonsynchronous multiple access. However, because the system has a mutual interference the number of channels that can communicate at the same time is small as compared with TDM. This paper presents a new spread spectrum multiple access communication system without mutual interference. The system was constructed and through experiment we confirmed that a improved amount of interference power when interference canceller be used increased to 24 ㏈ from 14 ㏈.
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