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이영철,홍준표,이학주 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.8
Solidification analysis of shaped castings and prediction of shrinkage cavity formation by the finite difference method were demonstrated with several examples. Several actual castings of aluminum alloy in sand mold wore experimented and the results were compared with those obtained by computer simulation. The two prediction parameters, temperature gradient and critical fraction solid for fluid flow, and an auxiliary parameter shrinkage potential, were adopted for predicting the formation of shrinkage cavity or porosity in aluminum alloy castings. It was found that a quantitative design of shaped castings can be made by the computer aided solidification analysis.
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이영철 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.2
본 논문에서는 전력증폭기의 비선형 특성을 하모닉바란스법에 의하여 분석하였으며 비선형 특성을 개선하기 위하여 전력증폭기 전단에 감쇠기와 위상기에 의한 적응귀환 모델을 적용하였다. 분석결과 제안된 선형화 모델에 의하여 제3차 혼변조왜곡이 약 48㏈만큼 개선할 수 있음을 보였으며 입력신호가 28㏈m이하에서 매우 우수한 선형화 특성이 있음을 확인하였다. Nonlinear characteristics of Solid State Power Amplifier has been analysed by harmonic balance method. Adaptive Double Envelop Feedback linearization model which is composed attenuator and phase shifter at front of power amplifier is applied to improve the nonlinearity of the designed power amplifier. Modelled linearization is improved 48㏈ of the third order intermodulation distortion and is proved a good linearity under 28㏈m input signal by MDS simulation.
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動 : Emsemble for 2 Sopranos, D. Bass, & piano
이영철 淸州大學校 1983 論文集 Vol.16 No.2
DONG(動 : Movement) implies the meaning of inactivity. The value of inactivity may possibly be measured by the force of movement. Everything that exists in the world starts from the status of inactivity and the result of everything is the realization of such phenomena. First, I have made an attempt to use a method that enables any sounds which were optionally selected to continue without any variations and leads to another status in an inductive way so that it creates variations to inactive sounds. Secondly, I have tried to appreciate the value of movement in a complex feeling of unexpected revelation through accidental collision of tone intervals or rythms which are variable according to different situations rather than appreicating the meeting of exact value of sounds and exact rythms by almost fixed sound expressions to moving melodies. Finally, I have selected two sopronoes on the basis of the sound value of instrumental music rather than melodic structures by words in common senses and tried to express my own conviction on movement through the combination of sound colors and rythms of double bass and piano.
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선형계획에 의한 배합사료가 Broiler 에 대한 경제적 영양소요구량에 관한 연구
이영철,하서현 ( Young Chul Rhee,Su Hyun Ha ) 한국축산학회 1976 한국축산학회지 Vol.18 No.5
This experiment was conducted to seek the economic nutrient requirements of practical broiler diet under the circumstances of Korea where high energy ingreidents are scarcely available. Four different least cost diet were formulated using electric computer to contain 3200 ㎉ ME ㎉ per ㎏, 3000 ㎉, 2800 ㎉ and 2600 ㎉ respectively and 2600 ㎉ respectively and other required nutrient equivalent to each ME content. The grass income was the highest for lowest energy diet showing 419 won, 411 won, 382 won and 388 won respectively. This was accomplished by significantly lowered feed cost per ㎏ as the ME content of experimental diet lowered. Although they showed decreased body weight gains and greatly increased feed intakes. This results implies that highest nutrient requirements as showing NRC are not always return highest profit as long as the situations like this experiment are concerned.
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