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EPS 엔드밀 가공 시 표면 거칠기에 미치는 가공조건에 관한 연구
서금희,손민규,윤길상,고영배,Seo, Keum-Hee,Son, Min-Kyu,Yoon, Gil-Sang,Ko, Young-Bae 한국금형공학회 2017 한국금형공학회지 Vol.11 No.2
EPS used in lost foam casting elastic modulus is extremely low. So it is necessary to derive machining conditions for effective cutting. Therefore this study were analyzed end-milling machining conditions to affecting the surface roughness of EPS foam. The machining conditions were set to depth, feed, and RPM at 3-level. And 18experimental conditions were derived using mixed orthogonal array. The most important condition for surface roughness is RPM. In addition, RPM machining condition range test that can realize surface roughness less than $10{\mu}m$ was performed. he range of RPM conditions is more than 15,000. However the range of RPM conditions is a condition that is difficult to use in actual field. In the future variance analysis and experiments are needed to derive the range of machining conditions available.
서금희 ( Kum Jee Seo ),김기영 ( Ki Young Kim ),문병문 ( Byung Moon Moon ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.3
A series of refractory mold coatings were applied to cast iron specimens, and their resistances to wear and spalling were investigated. Tests were carried out with own made measures, and also a calculation was tried for the comparison of a part of results like spalling. Worn width by scrubbing the indenter on the coating layer increased significantly at high temperature. Temperature increasing rate across the specimen when the coating side was exposed to 1,000oC was in the range of 14.5~75.8oC/sec·mm, and specimens with thicker coating layer showed lower temperature increase. Severe spalling of coated layer was observed after heating the specimen, and it was able to confirm by calculation using a commercial code.
단일 절삭을 이용한 미세금형의 구배각 구현에 관한 연구
서금희(Keum Hee Seo),우창기(Chang Ki Woo),서태일(Tae Il Seo),윤길상(Gil Sang Yoon) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Recently micro molds for plastic injection processes or micro stamping processes (hot embossing processes) were generally required for various micro-scaled products. In cases of micro molds various problems appears because relatively small tools have to be used. In our study, strongly concerned an approach which allows to machine suitable draft angles by only one pass cutting through adjustment of cutting conditions so that tool deflection effects should cause machining errors as much as required draft angles.
흑피흰개미버섯(Termitomyces albuminosus) 인공재배를 위한 균사배양 특성
장현유,서금희,조혜연,Chang, H.Y.,Seo, G.H.,Cho, H.Y. 국립한국농수산대학교 교육개발센터 2019 현장농업연구지 = Journal of practical agricultural resear Vol.21 No.1
The investigation of mycelial growth for artificial cultivation in T. albuminosus determined that within PDA, YM, MEA medium, both KNCAF 9001 and 9002 strains showed the highest mycelial growth in MEA media with 89, 81 mm, respectively, followed by YM, PDA in respected order. Furthermore, optimal mycelial growth of 89 and 77 mm in 9001 and 9002, respectively, at 25 ℃. Mycelial growth rapidly decreased at 30 ℃, but it was confirmed that it survived at 40 ℃. At pH 6, mycelial growth was fast with growth of 89 and 88 mm for both 9001 and 9002, respectively. In the case of 9001, the addition of with cotton seed hull(80%) and rice bran (20%) each other resulted in maximum productivity of 99 mm/10 days. The result differed in order of corn cob(97 mm), oak sawdust(96 mm) and poplar sawdust(93 mm). Ultimately, the result confirmed that addition of rice bran in comparison to bran resulted in higher yield. Even with identical medium component, 9002 showed the same tendency as 9001 but its growth was relatively slower than 9001. The effect of mycelial growth on the moisture content of the medium was best at 101. 94 mm/10 days when the moisture content of 9001 and 9002 was 65%. Mycelial growth rate tended to be slower when the moisture content was higher or lower than 65%.