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박준기(J. K. Park),한창수(C. S. Han) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This paper describes the fabrication method for atomic force microscopy(AFM) tip with multi-walled carbon nanotube(MWNT). For making a carbon nanotube (CNT) modified tips, AC electric field which cause the dielectrophoresis was used for alignment and deposition of CNTs in this research. By dropping the MWNT solution and applying an electric field between an AFM tip and an electrode, MWNTs which were dispersed into a diluted solution were directly assembled onto the apex of the AFM tips due to the attraction by the dielectrophoretic force. In this case, we investigate the effect of the angle between a tip axis and an electrode. Experimental setup were presented, and then CNT attached AFM tips are successfully shown in this paper.
탄소와 질소 함량에 따른 탄질소 복합첨가강의 내마열 특성 변화
박준기(J. K. Park),이슬기(S. K. Yi),김성준(S.-J. Kim),김용석(Y.-S. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Dry-sliding-wear behavior of Fe-18Cr-10Mn steel with various carbon and nitrogen contents was characterized, and the effect of carbon and nitrogen contents on the wear was investigated. Dry sliding wear tests of the steel were carried out at room temperature against an AISI 52100 bearing steel ball using a pin-on-disk wear tester. Applied wear loads were varied from 10 N to 100 N, and the sliding distance was fixed as 720 m. Worn surfaces and the wear debris of the steel were examined using an SEM to find out the wear mechanism. It was found that the Fe-18Cr-10Mn with both carbon and nitrogen exhibited superior wear resistance to the steel with only nitrogen. The wear resistance of the Fe-18Cr-10,m-xC-yN alloy was explained by the increased strain-hardening capability with the interstitial atoms.
선형운동가이드용 블록 연삭 공정 시뮬레이션 및 개선에 대한 연구
조명동,박준기,홍성욱 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
This paper presents a result of simulation and improvement of grinding process for linear motion guide blocks. A simulation software, which is based on cylindrical grinding process, is used to predict the grinding wheel wear during the grinding process for linear motion guide blocks. To validate the simulation, the simulation results is compared with the experimental one. Simulation study is extended to obtain an optimal grinding condition for minimizing the grinding wheel wear. The optimal condition is validated through an experiment. A multi-objective optimization is also performed by applying the desirability function and overlaid contour plot techniques. The optimal solution which is the result of optimization to the grinding condition, is applied to reduce the grinding wheel wear and surface roughness.