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용탕단조법에 의하여 제조한 $SiC_p$/Al 복합재료의 2차 성형공정이 기계적 성질에 미치는 영향
서영호,강충길,Seo, Y.H,Kang, C.G 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
A metal matrix composites(MMCs) for A16061 reinforced with silicon carbide particles is fabricated by melt-stirring method. The primary products of MMCs billets are prepared by volume fractions 5 vol% to 20 vol% and particle size $13\mu m$ to $22\mu m$.This paper will be made to examine the microstructure and mechanical properties of fabricated $SiC_p$/Al 6061 composite by melt-stirring and squeeze casting method. The MMC billets is extruded at $500^{\circ}C$ under the constant extrusion velocity $V_e$=2mm/min using curved shape die. Extrusion force, particle rearrangement, micro structure and mechanical properties of extruded composites will be investigated. The mechanical properties of primary billets manufactured by melt-stirring and squeeze casting method will be compared with extrusion specimen. The effect of volume fraction and size of the reinforcements will be studied. The increase in uniformity of particle dispersion is the major reason for an improvement in reliability due to hot extrusion with optimal shape die. Experimental Young's modulus and 0.2% offset yield strength for the extruded MMCs will be compared with theretical values calculated by the Eshelby method. A method will be proposed for the prediction of Young's modulus and yield strength in $SiC_p$ reinforced MMCs.
서영호(Y.H.Seo),조행묵(H.M.Cho),김현정(H.J.Kim),이창식(C.S.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
In order to decrease fuel comsumption rate and emissions, lean burn engine which has equipped swirl control valve, is investigated experimentally on the test bench. Single cylinder engine was used to test the combustion and emission preformance with 4 kinds of swirl valve. Decrease in the carbon manoxide, hydrocarbon and specific fuel consumption was shown at the lean condition, which means that a good choice of swirl valve on the given intake port geometry can be used to increase the combustion efficiency.
고랭지감자 재배지 양분 과다 및 불균형 해소를 위한 제언
서영호 ( Y. H. Seo ),안문섭 ( M. S. Ahn ),강안석 ( A. S. Kang ),정영상 ( Y. S. Jung ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2011 강원 농업생명환경연구 Vol.23 No.3
The use of complex fertilizer for potato containing relatively high content of phosphate compared with nitrogen and potassium may attribute to high content of available phosphate of soil cultivating potato in mountainous highland. This experiment was conducted at two sites of a farm in Pyeongchang, one of the major potato cultivating county in Korea, in order to examine the effect of recommended fertilization on yield and quality of potato and soil chemical characteristics. Significant difference in growth and yield characteristics of potato was not observed between fertilization based on soil testing and conventional fertilization of potato cultivating farms. Recommended fertilization resulted in relatively low content of available phosphate and exchangeable potassium in soil in comparison with conventional fertilization. Solid and starch contents of potato for recommended fertilization were not significantly different from those for conventional fertilization. The results obtained from the study imply that fertilization based on soil testing or customized fertilization may improve soil characteristics and ensure yield and quality of potato.