스위치 커패시터 位相固定回路를 利用한 周波數合成方式의 텔레비젼 選局回路

文光碩,李健一 경북대학교 공과대학 1984 工大硏究誌 Vol.13 No.-

In this paper, a television-channel selection circuits using SC-PLL was designed and interface circuits for the microprocessor was provided. The circuit has employed one-touch channel selection method and sequential channel selection method. The tuning speeds of the system in FCC normal channels were about 0.3 sec. Overall experimental circuits of this paper can be implemented one-chip IC.

우차직교 계열 기준신호를 이용한 문자다중방송신호의 고스트 제거 ( ghost Cancelling of Teletext Signal Using Even-Shift Orthogonal Sequences as A Reference Signal )

문광석,Mitsutoshi Hatori,박남천,이건일 대한전자공학회 1989 대한전자공학회 학술대회 Vol.1989 No.7

트랜스버셜형 적응필터를 이용한 고스트제거에 관한 연구

문광석 부산수산대학교 1990 부산수산대학교 연구보고(자연과학편) Vol.30 No.1-2

복소적응필터를 이용한 텔레비젼 고스트제거 특성 개선

문광석 부경대학교 수산과학연구소 1994 硏究業績集 Vol.18 No.-

복소적응필터를 이용한 텔레비젼 고스트제거 특성 개선

문광석 부산수산대학교 산업기술연구소 1993 産業技術硏究所 硏究報告 Vol.4 No.2

트랜스버셜형 적응필터를 이용한 고스트제거에 관한 연구

文光碩 釜山水産大學校 1990 釜山水産大學 硏究報告 Vol.30 No.1-2

In this paper, a method to cancel ghost of television using adaptive transversial filter in baseband is studied. The characteristics of various reference signals of adaptive transversial filter for ghost cancelling are described and ghost cancelling characteristics of reference signals are compared by computer simulation. It was found that an even-shift orthogonal sequences as a reference signal is best considering in ghost cancelling performance.

中樞를 通한 Neostigmine 이 家兎 腎臟機能에 미치는 影響에 關한 硏究

文光錫 충남대학교 의과대학 지역사회의학연구소 1977 충남의대잡지 Vol.4 No.2

1 In this study, central role of neostigmine administered intracerebro-ventricularly on the renal function of the rabbit was investigated. 100㎍ of intraventricular neostigmine produced diuretic effect following antidiuresis, concomitant with changes of renal blood flow, glomerular filtration rate and urinary electrolytes excretion. Intraventricular atropine-pretreatment inhibited the diuretic effect of intraventricular neostigmine and potentiated the antidiuretic effect of the drug. Changes of the parameters of renal function by intraventricular neostigmine after the blocker were similar to the urine flow respectively. Intraventricular regitine potentiated the diuretic effect of intraventricular neostigmine and inhibited the antidiuretic effect of the drug. Renal blood flow and glomerular filtration rate by the intraventricular neostigmine were decreased in the presence of regitine while excessive urinary excretion of electrolytes was observed. From the above results, it is suggested that central cholinergic mechanism and other factors play important role of diuretic effect of intraventricular neostigmine and the antidiuretic effect of the drug is not due to the central adrenergic mechanism.

우리나라 中部 農村地域住民 死亡樣相에 關한 調査硏究

文光錫,沈雲澤 충남대학교 의과대학 지역사회의학연구소 1986 충남의대잡지 Vol.13 No.1

For the purpose of analizings the causes and the trends of deaths, and to know the actual states of death certification, we analyzed the records of total 10,415 deaths from 15 Myons of Chung cheong Province during past 10 years, from the January 1, 1975 to the December 31, 1984. Followings are the conclusions therfrom: 1. Of the total deaths, the rate of notification of death with medical certificate was 16.0%, and that with other certificate occupied 76.0%. The rate of notification of death with medical certificate was the highest in the plain area, but that with other's certificate was the highest in the seaside area. 2. 90.6% of deaths in hospital of clinic were reported with medical certificate, but 82.1% of home death was reported with other certificate. The rate of that reported with Medical Certificate become gradual increased in incidence with years. 3. 82.0% of total deaths were reported within one month, the rate become gradual increased in incidence with years. 4. Of the total deaths, below 10 years of age group occupied 8.1%, in the twenties the rates were 5 to 6%. After the forties the rate was increased by ageing, that is 10.2% in the forties, 18.5% to 13.1% in the fifties, 18.5% in the sixties and 32.5% in after the seventies age group, respectively. 5. The proportional mortality indicator was below 60 in time during 1975-1979, 62-63 in 1980-1982, but above 70 in 1983 and 1984. 6. The proportion of hospital or clinical deaths was slightly increased with 3.3% in 1975, 5.0% in 1980 and 6.6% in 1984. 7. Sex ratio of the deaths was higher in male children up to the sixties. Home deaths occupied 90.1% and hospital or clinic deaths occupied only 5.6%. 8. The proportion of deaths was higher, but lower in Summer in seasonal difference. The rate of below thirties was high in Spring and Summer, but the rate of over fifties was high in Autumn and Winter. 9. In the past 10 years from 1975 to 1984, the main causes of death were of Unknown cause, Disease of circulatory system, Symptoms·signs and ill-difind conditions, Neoplasms, and Injuly and poisoning in that order. But those that were of Unknown cause, Disease of circulatory system, Symptoms·signs and ill-defined conditions, Neoplasms, Injury and poisoning, Disease of digestive system, Infection and parasitic disease in that order in 1975-1979, and Unknown cause, Disease of circulatory systems, Symptoms·signs and ill-defined conditions, Injury and poisoning, Neoplasms, Disease of circulatory system and Infection and parasitic disease, in that order in the year 1980-1984. 10. The rate that we could have analized the cause of death was 87.1% only by the Medical Certificate, but the rate of that was 55.3% by the Medical Certificate and Neighbour's Certificate. 11. The cause of death in male were Unknown and others, Disease of the circulatory system, Symptoms·signs and ill-defined conditions, Injury and poisoning, in that order, but those in female were Unknown and others, symptoms·signs and ill-difined conditions, Disease of circulatory system, Neoplasms, Injury and poisoning, in that order. 12. For age specific causes of death, the highest rate was Unknown and others in all age group, without that the main causes were Disease of respiratory system, Infection and parasites, Injury and poisoning, Disease of nervous system and sense organ in the below ten age group; Injury and poisoning, Infection and parasites, Neoplasms, and Disease of the respiratory system in tens and thirties age group; Disease of the respiratory system, Disease of the digestive system, and Infection and poisoning fifties group, but Disease of the respiratory system, Symptoms·signs and ill-defined conditions, Neoplasms, and Disease of the digestive system in after sixties age group, respectively. 13. The frequent causes of death were different by the season, mainly, Unknown and others, Disease of the circulatory system, Symptoms·signs and ill-defined conditions, Injury and poisoning, and Neoplasems in that order in Autumn; but Unknown and others, Disease of the circulatory systems, Symptoms·sign and ill-defined conditions, Neoplasms and Injury and poisoning in that order in other seasons.

웨이브릿 변환에 기반한 적응 음향반향제거

류권열,안주원,문광석 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1

In this paper, an adaptive acoustic echo canceller based on the wavelet transform filter banks is proposed. The proposed algorithm improves the performance of AEC with a realtime process. The conjugate quadrature filter by Daubechies D4 wavelet is used for proposed wavelet subband filter banks. Adaptive filter coefficients of each subband are updated using LMS algorithm. Subband output signal vectors of adaptive filter are synthesized by synthesis filter banks. The output of adaptive filter is obtained a widband characteristics. As a result of computer simulation using the practical speech signal, the proposed method reduces noise level about l6dB.

우차직교계열의 자기상관계수를 이용한 다중경로인식에 의한 부호화 전송방식 문자방송신호의 적응등화

문광석 釜山水産大學校 1994 釜山水産大學 硏究報告 Vol.34 No.1

Coded transmission teletext using〔272, 190〕 shorted difference set cyclic code with error correcting code is strong for noise and ghost. In spite of that, strong near ghosts and noise are one of the most serious problems, causing deteriorating transmission quality. In this paper, an adaptive equalization method in the coded transmission teletext signal by mult-path identification using the sum of autocorrelation of even shift orthogonal sequences is proposed. The characteristics of the proposed adaptive equalization method is investigated by computer simulation. As a result, when the SN ratio is 30dB and the carrier phase difference of the ghost is 0 degree, the bit error rate is less than ?? even for a strong near ghost of about 0dB. and when the carrier phase difference of the ghost is 180 degree, the bit error rate is less than ?? for the case of a single near ghost of 2dB. Even for multi-ghost, the bit error rate is less than ?? if the level of the strongest ghost is less than 2dB.