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Dong-Hyun Cho(조동현),Nam-Do BacK(백남도) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.1
In this study, the hole-cavity resonance technology and the micro pore stainless chip sintering technology were fused to develop silencers with excellent noise attenuation performance even at fluid pressures exceeding 30 bar for the first time at home and abroad. As a result of this study, the noise attenuation performance was greatly improved as reflection, loss, and resonance were made to occur thousands of times simultaneously when fluids pass through the sintered micro pore stainless steel chip sound absorber. The noise of the gas emitted from the bomb without the silencer was shown to be 125dB. And noise test conducted after installation of the silencer showed the noise of 67dB. Given the study results, the amount of noise was greatly reduced in the sintered silencer.
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白南渡 진주산업대학교 1975 論文集 Vol.13 No.-
Of the general prob1ems concerning teaching mathematics, first, I described the general features, second, the particulars, and this time I will describe such and such parents are disired to cooperate with the teaching students at school. A teacher should have good character, sufficient knowledge of his major field, and firm view-point of eduation, of course, and it is most important how the parents cooperate with teacher's teaching for their student's better 1earning. There are many technical problems. A teacher of mathematics should not evaluate his students with zero, and the most important point is the process from which a conclusion is drawn out. The teacher had better give some points to a student required some answers as far as he knows if he cannot solve a question completely. On the contrary a teacher should be strict in evaluating a student with fu1l marks. Parents must not be impatient and they are required to treat their sudent with Jong-sightedness, and they should desert the so-called parent's disposition. There is a famous psychologist's saying,“Praise first and b1ame second.”
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