Binary-Decision 방식을 이용한 프로그래머블 콘트롤러의 개발에 관한 연구

전병실,이준환,엄경배 한국통신학회 1987 韓國通信學會論文誌 Vol.12 No.5

Binary Decision방법은 출력을 얻는데 요구되는 결정스텝이 최대 입력변수의 수를 넘지 않도록 한다. BD-PC모듈은 스캔 스피드를 개선하기 위해 이 방법을 이용하여 설계제작되었다. Binary Decision방식에 수반되는 메모리문제를 개선하기 위해 컴파일러 시스템을 개발하였다. 또한, 컴파일된 BD-PC목적프로그램을 BD머신의 메모리에 로디하기 위해 MDS와 BD-PC모듈간에 통신채널을 구성하였다. The Binary Decision method can evaluate any switching function in the number of steps not exceeding the number of input variables. A Binary Decision 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 BD-PC modules is also constructed to load the compiled BD-PC object program into the memory of BD machine.

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.

학사전산업무의 Total System과 인사행정 전산화에 관한 연구

전병실,이중열,이태준 全北大學校 1986 論文集 Vol.28 No.-

Total data base management system to manage the student and personnel administration is designed by proposed SCHEMA. This SCHEMA is constructed by 77 data sets with 206 items to avoid data repetition. The developed program which can be easily used in searching and modifying the data of total data base, is used with password technique for security. Total data base management system can successfully reduce the redundancy of data. Also it can improve the reliability of data.

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.

재전송 제어 알고리즘을 이용한 상호연결 LAN 의 특성 및 성능평가

田炳實,鄭景澤 전북대학교 공업기술연구소 1988 工學硏究 Vol.19 No.-

Communications between LANs are being needed by users of each LAN for distribution of jobs and resources sharing e.t.c.. We use the FDM method to interconnect two CSMA and a class of retransmission controls based on stochastic approximation techniques is applied to the infinite population, slotted, nonpersistent CSMA channels. Simulation results demonstrate the effectiveness of the controls in providing delay versus maximum throughput performance that closely approximates that of tn idealized channel in which terminal has perfect knowledge of the number of collided terminals. We compare characteristics and performance of a system with and without retransmission control algorithm. We showed the improved simulation results of performance and delay characteristics in the network which is applied retransmission control algorithm, and these results are more improved about 15 percent than not applied.

L 負荷의 Swiching時 Transistor의 二次Breakdown에 關한 硏究

田炳實 全北大學校 1975 論文集 Vol.17 No.-

Although second breakdown of power transistors has been routinely observed during the turn off of inductive loads, no satisfactory physical explanation has been developed which quantitatively describes this behavior. In this paper a mechanism based on avalanche injection. During turn off, current is localized to the center of the emitten stripe of a transistor. Depending on the magnitude of reverse base current and device parameters, the current density can reach levels which trigger avalanche injection.

自動 電話機의 Push-Button式 Dial Pulse 送出機의 設計

田炳實,趙正萬,金種皎 전북대학교 공업기술연구소 1978 工學硏究 Vol.8 No.-

The existing automatic telephone causes many troubles in dialling because its structure is mechanical. In this paper, a design example of pushbutton type dial pulse transmitter of the automatic telephone which has no mechanical trouble, is presented and discussed. It reduces dialling time, normalizes dial pulse, decreases dial troubles, increases the life of telephone dial and automatic telephone exchange, and prevents us from wasting the fee for a telephone call.

차량용 센서 개발을 위한 기초연구

전병실 全北大學校 1983 論文集 Vol.25 No.-

Recently the automotive engine control sensor art is the placing factor in the introduction of microcomputer-based engine controls. We need excellent sensors for engine controls. However, the field remains in a transient state, with multiple engine control law philosophies, a wide variety of control parameters in use or proposed for use, and proliferation of sensing concepts for those parameters. This paper shows engine control sensors for automobiles, and refers to various transactions on requirement summarized in table 1. and 2. The more important engine control sensor and function served by measurement are temperature sensor, position sensor, air flow sensor, oxygen sensor, and so on. Typical characteristics for each sensor are as follows. 1. Temperature sensor We should consider its stability, linearity, noise characteristics, and other environmental factors for the use of engine control sensor. For the sensing of coolant water temperature, manifold air temperature, we usually use the linear thermistor, semiconductor resistor or wire wound resistor, etc. A summary for these is shown in Table 4. 2. Pressure Sensor The pressure sensor, which is usually larger than others in scale, is easily aged and influenced by noise because of diaphragm vibration, Therefore a new sensor for semiconductor strain gauge is developed by morden IC technology. Although it is complex in structure large in scale, the LVDT (Linear Variable Differential Transformer) is very useful for pressure sensor. Typical pressure sensors for automotive control are shown in Table 5. 3. position sensor Classical reluctance sensor, capacitive position sensor, Wiegend type sensor, permanent magnent type sensor, and optical sensor are usually used for the position sensing. For the position sensing of crankshsft, we expect to develop a Hall effect position sensor. Typical position sensors are listed in Table 6. 4. Air-flow sensor Air-flow-rate-based control providers earlier information on fuel demand than a speed/density control. The sensor can be positioned upstream of the throttle. The combination of accuracy, dynamic range, and the state of art of flow calibration standards in such that the absolute calibration of mass air flow meter presents significant. Air-flow sensors for automotive control are listed in Table 7. 5. Oxygen sensor The zirconia oxygen cell was originally developed in Europe, but it is widely used throughout the world. It is the only oxygen sensor that is recently producted for automotive use. We classify oxygen sensors to zirconia oxygen sensor and titania oxygen sensor. This sensor operates as a switching element for the air/fuel value. The automotive engine control sensor field continue to evolve. Sensors for some of the older parameters are now mature, in use by many OEM_s, and not easily displaced. We should improve the following sensors. (1) Linear thermistor sensor, silicon sensor by LSI technology or wire wound resisters are necessary to develop for the temperature sensing. (2) The LVDT sensor and the potentiometer are widely used for the pressure sensing. If the semiconductor strain gauge is developed, it will be small in scale and have much better performance characteristics in the pressure sensing. (3) Sensors of permanent magnet type, reluctance type and optical type are used for position sensing. We should develop the Hall-effect or Wiegend type sensors in future. (4) Hot wire sensors, which do not use high pressure, are available for air-flow sensing, but we should develop vane sensors and air velocity sensors of vertex shelding type.

미분-동적프로그래밍에 의한 최적설계에 관한 연구

田炳實,李斗秀 全北大學校 1984 論文集 Vol.26 No.-

제약조건이 있는 최적제어문제를 해결하기 위하여 미분-동적프로그래밍을 적용하는 알고리즘을 확장한다. 이 방법은 벨만의 편미분방정식의 해를 구하기 위해 급수로 전개한 다음 반복법에 의해 해를 얻는다. 제어 신호를 구분적 선형함수로 근사화시킴으로써 비선형문제의 해를 얻었다. In order to solve the nonlinear optimal problem with constraints, the differential dynamic programming technique is employed. The power series expansion method and then the iterative method are applied to obtain the solution of Bellmans partial differential equation. An example shows that this technique is the rapidly convergent one as the solution comes close to the optimal point.

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.