二重歸還方式을 理用한 廣帶域 增幅回路의 設計

田炳實,趙正萬,김종교 全北大學校 1978 論文集 Vol.20 No.-

Many advantages are to be obtained from the use of negative feedback, at the cost of gain. These are as follows; the increase of frequency band-width, the improvement of amplification stability, the decrease of nonlinear distortion and noise, and the simplicity of impedance matching, etc. Many of electronic devices require wide frequency bands. For example, a cathode-ray oscilloscope, in order to cover the frequency range of 0 to 20 MHZ, requires an amplifier with the frequency band over 20 MHZ. Moreover, communication devices require the very wide frequency bands of several hundreds MHZ. A negative feedback is used widely in order to obtain the devices with wide frequency bands. This paper describes the analysis and the practical synthesis procedure of the design of shaped gain, wide-band, impedance matched, dual loop feedback amplifier that uses a cascade of two common emitter transistor stages. An amplifier is designed to have the lower cut-off frequency of 50MHZ. Experimental results are coincident to the specified characteristics as well.

마이크로 컴퓨터를 이용한 차량의 엔진점화시기 제어에 관한 기초 연구

전병실,김영수 全北大學校 1985 論文集 Vol.27 No.-

A system using ZDS, to control the ignition advance angle according to engine speeds, is designed and tested. The following conclusion is obtained by its experimental results; 1. Microcomputer aided advance angle control is successfully performed(according to engine speeds and usual advance angle characteristics). 2. It is possible to design the microcomputer-aided control system on one board and accordingly to install it on domestic automobiles. 3. The developed software can be put in ROM and alternated if necessary. Further study is desirable to be followed in order to develop other systems able to control any other parameters as well as ignition advance angle of domestic automobile engines.

Binary-Decision방식을 이용한 프로그래머블 콘트롤러의 개발에 관한 연구

田炳實,李俊煥,嚴景培 全北大學校 1987 論文集 Vol.29 No.-

The binary decision method can evalutate any switching function in the number of steps not exceeding the number of input variables. A programmable controller module is designed using this method so as to improve scan speed. A compiler system is also developed to relieve the memory problem which the binary decision method entails. A communication channel between MDS and PC modules is also constructed to load the compiled PC object program in to the memory of BD machine.

왈쉬 급수를 이용한 새로운 PWM 인버터의 구현

趙俊翼,田炳實 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-

This paper describes a new method to eliminate some selected harmonics(5, 7, 11th) is in PWM waveforms using Walsh and related orthogonal equations rquiting iterative solution methods which are not parctical real-time systems. In addition, synthesis of ow harmonic waveforms at high power system in not easy to implement with power electronic hardware. The goal of this paper is to achieve the hardware elimination in a PWM waveform by replacing the nonlinear equations in Fourier analysis with linear algebraic equations resulting from the use of orthogonal Walsh equation. This paper also describes how to synthesize low ordered harmonic waveform with practical power electronic hardware. Walsh and Radmacher functions are easioy manipulated by Harmuth's array generator, and those algorithms are accurate, computationally efficient and faster than algorithms based on Fourier analysis. In addition, this method is simulated to synthesize periodic PWM waveforms. Form experi-mental results, it is shown that a single-phase PWM waveforms are identified with the proposed method. And these methods are also extended to three-phase PWM waveform in this pa-per.

車輛用 無接点式 点火裝置에 關한 硏究

姜錤文,田炳實,김종교,金煥溶 全北大學校 1979 論文集 Vol.21 No.-

We choose the magnet detecting system of many that a ignition signal voltage can be induced in a pick-up coil by the rotation of timing rotor in distributor. As the timing rotor rotates with cam gear, the magnetic flux alternating rate changes through timing rotor-magnet-bracket-pick up coil. At this time, a detecting transistor detects the ignition signal on the pick-up coil and makes it a switching signal. This switching signal is amplified by transistors and applied to the primary of ignition coil in transistor ignition system without break point. In CDI ignition system without break point, the amplified switching signal is applied to the gate of SCR, a switching element. When a signal triggers the gate, a very high voltage appeared instantaneously in the secondary of ignition coil. A transistor and a CDI ignition circuit without point are designed respectively in fig. 6 & fig. 12. As a result of practical test on road, the CDI ignition system without break point among them presented the best running characteristics as fig. 14.

容量放電式 사이리스터 点火裝置의 特性改善에 關한 硏究

姜錤文,田炳實 全北大學校 1977 論文集 Vol.19 No.-

The ignition device for an automobile is a kind of high pulse voltage generator and it has conventionally been constructed by using mechanical elements. However it is apt to miss-fire when the automobile runs at high speed. In order to get rid of the inherent fault on those mechanical ignition systems, semiconductor elements are used in designing ignition device. There appears, at present, many kinds of ignition systems employed semiconductor elements. But the particular attention in this study is devoted to the analysis and design of capacitive discharge thyristor ignition system. The output voltage of the designed ignition system is up to 63KV when the primary voltage is 10 to 14 volts. The output pulse duration of the proposed design is within 600 microseconds and the peak impulse power of the device is 532 to 1000 watts. The charging time is long but the discharging time is short enough compared with the switching time of automobile system. Therefore this ignition system does not miss-fire at any speed of engine because of the high impulse output energy of this device. Furthermore the constant voltage source is applied to the converter circuit and to the thyristor gate, the stability of the capacitive discharge thyristor ignition device is improved. When this ignition system is applied to automobile system, it can be expected that the power of automobile engine is increased. the pollution exhausted from the automobile is decreased, and the life time of the electrical devices constructed in an automobile is extended.

비연결형테이타 서비스를 위한 B-ISDN구조

신영석,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-

With the emergence of high-spped LAN/MAN/WAN's a major data application of broadband ISDN(B-ISDN) is the interconnection of LAN's over a wide area, by using ATM transfer networks. In this paper, We consider two approaches which is supported connectionaless service in Boradband ISDN. First scenario is 'Case A' which supported by network indirectly and second scenario is 'Case B' which network directly. We show that connectionless service should be supplied by the Broadband ISDN itself using message handlers which support message routing and addressing, i.e., connectionless service function(CLSF), as described by the CCITT. We proposed a network topology and techinique of message handler, which reduces the routing database and avoids transit message handler overload. We show an example of system configuration and gateway architecture of LAN to LAN connetion for connection service.

X.25 패킷망 접속기능 설계 및 구현

신영석,김종교,전병실 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-

This paper presents the design and implementation of packet function for X.25 network. Packet access modules which we developed, is considered layered and modular architecture in UNIX Enviornment host of VMEbus system. In the performance of data transfer, It is capability of 120-150 DPPS(Data Packet Per Second) and can be able to portable any computer as partial modified these software and hardware.

신경회로망을 이용한 Kinematic 제어에 관한 연구

김정태,이창기,전병실 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-

In this paper we employ feed-forward multi-layered perceptron model with back-propagation for the robot manipulator position control. We obtain accurate dat from manipulator Kinematics solution give and effector trajectory and train neural network for generation of fairly accurate desired output values. We show that relation between the actual angle and desired angle are linear through the simula-tion.

필기체 문자 인식을 위한 신경회로 시뮬레이션

이창기,이완규,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-

This paper proposed a neural computer architecture for the learning of character pattern recognition categories. The architecture of self-organizations and self-stabilizations is recognition codes in response to arbitrary orderings of many and complex binary input patterns. Top-down attentional and matching mechanisms are critical in self-stabilizing of the code learning process. The architecture embodies a parallel search scheme which update itself adaptively as the learning process unfolds. After learning self-stabilizes, the search process in automatically disengaged. Thereafter input patterns have directly access to their recognition codes without any search. Thus recognition time does not grow as a funtion of code complexity. A novel input pattern can directly access a category if it shares invariant properties with the set of familiar exemplars of that category in the form of learned critical feature patterns, or prototype. Attentional vigilance determines how fine the learned categories will be. If vigilance increases due to an environmental disconfirmation, then the system automatically searches for and learns finer recognition categories. The simulation of this system shows satisfied result in the recognition of the hand written character of hangul.