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Slide Projector의 改良과 그 活用에 關한 硏究
鄭慶逸 건국대학교 1973 學術誌 Vol.15 No.1
A common automatic slide projector is designed such that its slide magazine moves only step by step and its slide film is projected on the screen whenever an operator pushes a change button attached in the remote control unit. And also it is designed such that its moving direction of slide magazine is reversed when ver an operator pushes a FWD-REV button attached in the remote control unit. In this reserch many efforts were made for a design of an automatic slide projector which would be capable of selecting any desired one from stored slides in a slide magazine in some simple mechanism as follows. (1) Improvement of rotary wheel gears. (2) Improvement of driving devices of motor. (3) Additional setting of a wiper of selecting tunner (4) Design of a driving electrical circuits using in a button switch of simple response analyzer Alpling above slide projector and simple response Analyzers to practical educational engineering fields, we expect some good educational gain as follows. (1) Optimization of instruction systems. (2) Sufficient exchange of educational informations (3) Exact observation of group learning responses.
Multi-Channel Amp System의 特性을 改善하기 위한 Channel Active Filter의 設計와 그 活用에 관한 硏究
鄭慶逸 건국대학교 1976 學術誌 Vol.20 No.2
The IC Op-Amplifier proves to be an extremeley usefull the 4 channel active filter for the multi-audio amplifier system in the realization of active RC networks. IC operationational amplifier have high imput impedance, low output impedance, large loop gain, small drift and high stable. The IC operational amplifier after circuit to be analyzed and which design procedures and sensitivity equations are given, are the inifinite-gain multiple feedback, voltage controlled voltage source realizations. In the paper on the design of multi-channel filter, we will be analyzed the usual summing type 18dB/oct 4 channel filter. (1) The R.C elements in the summing type channel filter are fewer than that in independent type channel filter (2) The channel Network Stage can be designed easily and independently. (3) The summing channel filter can be tuned easily. (4) The crossover frequencies are not changed. (5) Unity-gain band width as high as 100KHz are available in IC operational amplifier (6) The IC operational amplifier active filter have high stability. (7) Frequency as low as 10 Hz are possible.