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이승준,신인동,최수창,김용우,이종렬,이득우,Lee, Seung-Jun,Shin, In-Dong,Cha, Sao-Chang,Kim, Yong-Woo,Lee, Jong-Ryul,Lee, Deug-Woo 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
The development of high-speed spindle have been studied extensively for micro machining in advanced industrial countries. The research of miniaturized high-speed air spindle is important part which needs for the micro machining process of high quality. So, This study was to carry out results about design characteristics of miniaturized high-speed air spindle. We had designed 4type turbines and shaft. They were simulated in use the computer simulation programs. We made them as products. They measured RPM (revolutions per minute). As a result of experiments, there was a contrast among 4type Turbines. it reached 384,000rpm in 4.5bar of air pressure. And, We tried to compare the results of measurement whit the results of computer simulation.
해양환경 하에서 Ni-Cr계 자용성 합금 코팅된 ALBC3 합금의 캐비테이션 특성 평가
이승준,김성종,Lee, Seung-Jun,Kim, Seong-Jong 해양환경안전학회 2013 海洋環境安全學會誌 Vol.19 No.5
본 연구에서는 ALBC3 합금에 Ni기 자용성 합금으로 내마모성 및 내캐비테이션 특성을 향상시키기 위하여 용사코팅 후 열처리를 실시하여 캐비테이션 특성을 평가하였다. 본 연구 결과, 자용성 합금 코팅층이 높은 경도를 나타내어 내마모성이 우수할 것으로 판단되나, 다공질의 조직으로 인해 열악한 내캐비테이션 특성을 나타냈다. 따라서 열처리 조건의 최적화가 중요하며, 본 조건에서는 열처리 온도를 높여 자용성 합금 내 B와 Si의 유동성을 증가시킴으로써 기공이나 결함을 제거하여 특성개선 효과를 기대할 수 있을 것으로 판단된다. In this study, cavitation characteristics of a thermal spray coating were evaluated in order to improve durability and cavitation resistance. For a coating material, a Ni-based self-fluxing alloy was thermal-sprayed over a ALBC3 alloy substrate and subsequently modified by heat treatment.The resulted self-fluxing coating layer had relatively high hardness compared to the base material, and thus would be expected to exhibit good durability. However, the cavitation characteristics were deteriorated due to the intrinsic porous structure of the coating. Therefore, it is essential to optimize heat treatment condition during thermal spraying coating process for self-fluxing alloy, and in this research the increase in heat treatment temperature is thought to increase the fluidity of B and Si in the self-fluxing alloy and to remove pores or defects, leading to the characteristics enhancement.
중심과 편심축력을 받는 중공 프리캐스트 콘크리트 합성기둥의 압축강도
이승준,서수연,김강수,Lee, Seung-Jun,Seo, Soo-Yeon,Kim, Kang-Su 大韓建築學會 2015 大韓建築學會論文集 : 構造系 Vol.31 No.2
In this paper, in order to evaluate the applicability of KBC formula in calculating the strength of hollow-precast concrete (HPC) column for design purpose, a compressive capacity was evaluated through the concentric and eccentric test for the columns with various material strength and hollow size, respectively. Based on the test result, the suitability of code formulae was checked and the lateral confining effect of HPC composite column was also evaluated by using Mander's stress-strain relationship. Also, nonlinear sectional analysis process was performed. As a result, it was found that the strength of the HPC composite column could be suitably predicted by using KBC code formulae for design purpose. In the calculation of the compressive strength of the column by using Mander model considering the lateral confining effect of hoop, the confining effect of it in HPC was less than that in reinforced concrete column and changed corresponding to the concrete strength ratio between PC and CIP (Cast-In-Place). The effect decreases when the concrete strength of CIP is not less than that of PC. The flexural-compression capacity of HPC composite column can be suitably evaluated by using the effective strength of concrete.
기획특집2 - 초정밀 광학부품 기술 동향 -Polymer and Hybrid Optics
이승준,Lee, Seung-Jun 한국광학기기산업협회 2011 光學世界 Vol.135 No.-
광학 속성을 가진 폴리머 소재는 새롭고 정교한 전자광학 장치를 가능하게 해주고, 커머셜 마켓과 의학 용품, 바코드 인식, 보안과 지문 추출기, 동작 인식 센서, CCD 카메라 및 레이저 collimation 장치들을 가능하게 한다. 현재의 발전된 폴리머 기술과 인젝션 몰딩 기술은 높은 생산성과 정밀도를 향상시켜 왔다. 본 고는 이러한 폴리머-하이브리드 옵틱 기술에 관한 최신 동향으로서 Optronics 340호에서 발췌, 정리한 것이다.