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Clamp 및 Bleeder 回路를 가진 Source 時定數形 MOS Monostable MV
김강언 釜山工業大學校 1982 論文集 Vol.23 No.2
It makes the operation of the multivibrator stable and the metastable time not affected by change of the period of the trigger to add bleeder and clamp circuits to mono-stable mutivibrator in which time constant circuit is connected to source of MOSFET.
NYQ 및 Class ⅠⅡ PR 傳送에서 Digital FM 周波數 檢波方式에 對한 Error Rates 解析
김강언 釜山工業大學校 1983 論文集 Vol.24 No.2
It was found that in digital FM frequency detection, the characteristics of spectra and error rates were made good by implementing the baseband filter on a transmitter and a receiver separately. This paper analytically discassed the error rate of this method using Nyquist (NYQ) transmitting and classⅠ,Ⅱ partial response(PR) transmitting.
許萬鐸,金康彦 釜慶大學校 1996 釜慶大學校 論文集 Vol.1 No.2
In this paper, we improved analyzing method of a spectrum envelope¹ using the diffusion filter bank.???? We increased the number of channel of filter bank. By dividing analysis band into subbands, we decreased the number of diffusion process. And, by increasing the number of difference, we got higher selectivity. As a result of them, we reduced the total processing time, and got higher enhancement of discrimination. Through computer simulation, we showed that average recognition rate for single vowels of real voice is 88.3[%]. Hence We confirmed it to be useful for speech recognition which use spectrum analysis to analyze frequency components.⁴
金康彦 釜山工業大學校 1986 論文集 Vol.28 No.2
PIWM 통신방식에서 1차 PIWM파 전송시스템의 신호대 잡음비 해석을 중점적으로 고찰하여 다음과 같은 성과를 얻었다. 수신잡음해석에 있어서 등가잡음 펄스열을 상정하고 자기상관함수의 도출과정을 명확히 하여 잡음전력을 해석하였다. 이것에 의하여 전송주파수가 일정한 경우 변조도의 증가에 따라 신호대 잡음비는 향상되며 변조도가 일정한 경우 반송주파수는 높을 때 신호대 잡음비가 좋다. 동일한 신호대 잡음비를 얻으려면 변조도를 높게 하기보다는 반송주파수를 높게 하는 것이 비대역이 적다.
김강언 釜山工業大學校 1984 論文集 Vol.26 No.-
In this paper, the quantity of phase shift and insertion loss according to the resistance variation of the PIN diode in the microwave phase shifter which is formed by connecting PIN diode serially between source and drain of the GaAs single and dual FET, were discussed.
김강언 釜山工業大學校 1982 論文集 Vol.23 No.2
By method of clamping the not-inverting terminal of the differential operational amplifier with a zenerdiode and applying a trigger signal to inverting terminal which has constant voltage by use of bleeder circuit, we can operate the mono-stable multivibrator very stabley and can make the metastable time not affected by period of a trigger and very the metastable time continuously.
김강언 釜山工業大學校 1981 論文集 Vol.22 No.2
A simple circuit of sinusoldal wave oscillator using the negative-resistance characteristic of GTO thyristor was composed and investigated their characteristics. The results of as folow 1) The operating of this oscillator is stable. 2) The wave form of oscillation is a good sinusoldal wave. 3) The maximum frequency of oscillation is 420 kHz.
펄스화 아나로그 신호와 Digital 신호의 簡易 多重方式
김강언 釜山工業大學校 1988 論文集 Vol.30 No.-
서로 다른2가지 신호인 광대역의 아날로그신호와 디지털신호를 다중화시키는데 아날로그신호에 의한 발광소자의 非線形性을 피하기 위하여 먼저 아날로그 신호를 PIWM하였다.즉 펄스화 아날로그신호로 만들었다. 이 펄스화 아날로그신호의 진폭을 디지털신호에 따라 조시키는 새로운 다중 방식을 제안하였다. 또 이런 다중방식에 의하여 얻은 다중 신호를 수신할 수신기의 특성인 아날로그신호에 대한 S/N비 및 디지털신호의 오차율에 대한 이론식을 도출하였다.