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김호찬(H. C. Kim),최홍태(H. T. Choi),김준안(J. A. Kim),이석희(S. H. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Algorithms on modification of NURBS surface requires modeling history to change its boundary conditions. The history is stored when the surface is modeled and saved in the corresponding model file. But when the model is transferred to other systems the history generally cannot be recognized. So modification algorithms without history is highly required. Previous works on the field is concentrated in the point based modification without any restriction condition. Therefore this study is intended to develope a curved based modification algorithm with restriction conditions. A rapid modification algorithm is suggested, implemented and tested.
Multi-material Additive Fabrication of a Carbon Nanotubes-based Tactile Sensor
C. Fekiri(챠이마 페키리),H. C. Kim(김호찬),C. Kim(김지언),I. H. Lee(이인환) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Additive manufacturing has increased the ability to fabricate complex shapes and multi-material structures. Alongside the development of sensors fabrication techniques, there is a need for novel printable materials with mechanical flexibility and electrical stability. Carbon nanotubes (CNT) have outstanding properties that make them good candidates for flexible electronics. In this work, we demonstrate the development of printable multi-walled carbon nanotubes (MWCNT) - Polydimethylsiloxane (PDMS) nanocomposite. The MWCNT concentration of 8 wt% was found to be the optimum condition for enhanced printability and mechanical properties. The material was extruded using direct ink writing process to fabricate a flexible piezoresistive tactile sensor. Spectroscopic characterization of the composite revealed carbon-like behavior of the material after dispersion of the MWCNT in the PDMS polymer matrix. This indicates that the interaction between PDMS and MWCNT surfaces did not influence the structural properties of the MWCNT. Characterization of the tactile sensor under static and dynamic loading of pressure revealed high sensitivity and fast response-recovery time. The sensor was also able to withstand high pressure with no significant structural deformation which shows that it can operate in various applications.