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권영필(Y. P. Kwon),이동훈(D. H. Lee),방정환(J. H. Bang) 한국자동차공학회 1992 오토저널 Vol.14 No.6
This study is on the performance of the perforated tube muffler when it operates as an exhaust silencer with through-flow, steady or pulsating. Theoretical estimation of the insertion loss was made by means of transfer matrix and by using the impedance equation for the perforated tube obtained for the case of low-speed steady through-flow. Experiment was performed for the measurement of the insertion loss at two flow conditions. The one is a steady flow supplied by blow-down of a compressed air reservoir and the other is a pulsating flow from the exhaust pipe of an idling diesel engine.<br/> The effect of the through-flow velocity and steadiness on the muffler performance was obtained. By comparing the theoretical prediction with the experimental result, the validity of the impedance equation in the theoretical model was discussed. It has been found that steadiness as well as magnitude of the through-flow has a significant effect on the perlormance of the perforated tube muffler. Especially, the self-noise due to the pulsating flow in the engine exhaust system must be taken into account for the prediction of the muffler performance.
최상원,오남희,방정환,정관용,김은영,류비탈리 여수대학교 산업기술지역개발연구소 2000 産業基術硏究所 論文集 Vol.9 No.-
Amino acid mixtures containing waste protein resolved by sodium hydroxide hydorolyzing method were obtained. The composition and concentration of amino acid mixtures were analyzed by high performance liquid chromatography. The disinfectant with tetraminecopper(Ⅱ) sulfate monohydratercu[Cu(NH3)4SO4ㆍH2O] from amino acid mixtures was synthesized. Complexes of synthesized disinfectant(amino acid-copper(Ⅱ) complexes) received by using UV- spectrophotometer were confirmed. Sterilizing power on Escherichia coli, Staphycoccus aureus, Xanthomonas and campestris, Pseudomonas solanacearum was tested and compared to synthesized disinfectant and EG105, used generally. Also, we carried out the experiment of sterilizing ability for abseence of metal ions (Ca2+, PO43-, Mg2+). The sterilizing effect of synthesized disinfectant was better than other being not affected by metal ions (Ca2+, PO43-, Mg2+).
이상태,정관용,최상원,오남희,방정환,김정우 여수대학교 1999 論文集 Vol.14 No.2
For obtaining of disinfectant surfactant from amino acid mixtures, we treated the butchery wastes which contain much protein by sodium hydroxide hydrolyzing method. The composition and concentration of amino acid mixture were anaslyzed by high perfomance liquid chromatography. The disinfectant agent with Tetrammine copper(Ⅱ) sulfate monohydrate [Cu(NH₃)₄²+]SO₄·H₂O was synthesized by using amino acid. The sterilizing power of the new synthesized disinfectant agent (diammine aminato copper(Ⅱ) complexes) was compared with formaline(CH₂O) and different type copper complex(ET),which is used generally. The sterilizing effect to Edwardsilla sp, Escherichia coli, Salmonella typhi, Bacillus spp, Staphyloccus aureus. Pseudomonas anguilliseptica. Edwardsilla tarda, showed that the new synthesized disinfectants were better than others. The testing of ecological safety effect was applied to toxicity of Rotifer, Altimia and gold fish. The toxic result indicated of the new synthesized disinfectant agent is excellent safe in ecological field.