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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.
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 ㏈.
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.
중국 운남성의 벼 재배 현황 및 자포니카 벼 품종 육성 방향
김명기,현웅조,이상복,정종민,안억근,양창인,백만기,장재기,정응기 한국국제농업개발학회 2016 韓國國際農業開發學會誌 Vol.28 No.3
The rice growing area in Yunnan province of China can be divided into six regions based on climate weather conditions, altitude, ecotype of rice varieties, eco-system, and so on as follows: the alpine and high elevation area of Japonica rice, the cold and warm area of Japonica rice, the Indica and Japonica rice area, the single and double cropping area, the paddy and upland rice area, and the single cropping area of Indica rice. In Yunnan, the annual acreage of rice cultivation has been maintained about 1 million hectares, only 3.8 percent of China’s paddy fields. Amounts of unhulled rice production in 2013 was estimated to be around 6.7 million tons. And average unhulled rice yield per ha was 5.79 tons to 6.70 tons during 2011 to 2013. The three major breeding stages commonly have been for rice breeding program: selection of purelines from native varieties by the first 1960s.: dissemination of introduced varieties from foreign countries in the mid 1960s through 1970s; and creation of new developed varieties by hybridization followed by selection after 1980s. In terms of developing Joponica rice variety, its breeding objectives has been set differently depending on altitude: high yielding, grain quality, cold tolerance, and adaptable to low nitrogen fertilizer varieties for growing in areas of 2,100 m to 2,600 m above the sea level; high yielding, grain quality, resistance to disease, and cold tolerance varieties for cultivating in areas of 1,800 m to 2,100 m; and high yielding, grain quality, resistance to disease, and lodging tolerance varieties for planting in areas of 1,450 m to 1,800 m. In addition, researchers are breeding Japonica hybrid varieties for improving yield potentials in Yunnan Agricultural University.