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이인환(I.H.Lee),장성현(S.H.Jang),오성택(S.T.Oh),김민경(M.K.Kim),김호찬(H.C.Kim),조해용(H.Y.Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Additive Manufacturing is being focused to apply for directfabrication of a product. In this paper, 3-Dimensional Circuit Device(3DCD) fabrication based on 3-D Printing technology was proposed. In contrast with general 2-Dimensional Printer Circuit Board(PCB), circuit elements of 3DCD are placed in 3-Dimensional configuration at multiple layers. Therefore, 3DCD technology had a design freedom of an electronic product.
이인환(I. H. Lee),최지순(J. S. Choi),이승표(S. P. Lee),고태조(T. J. Ko) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Micro-stereolithography technology is used for fabricating of 3-dimensional micro-structures. In some cases, this technology is more economical and simpler than MEMS and LIGA technologies based on semiconductor process. In this research, the micro-sterolithography apparatus that is more economical and simpler than current micro-stereolithography apparatus was developed. This apparatus uses UV lamp and optical fiber as a light source and light delivery system, respectively.
Development of Carbon Nanotubes-based Flexible Tactile Sensors Using Direct Ink Writing Process
I. H. Lee(이인환),C. Fekiri(챠이마 페키리),H. C. Kim(김호찬) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Additive fabrication technologies have been well established and they are starting to integrate the electronics field since they offer more freedom in the design. Nevertheless, the field of wearable electrochemical devices is in constant search of a new class of printable inks with properties that enable the devices to perform flawlessly in conditions commonly experienced by the human body. For example, the developed devices should be small, thin, light, flexible, and should adhere to the complex three-dimensional curvatures of the human body. Taking into consideration the mechanical flexibility of polymeric electronics, the development of flexible and stretchable electronics is becoming an alternative approach beyond conventional silicon-based devices. In this regard, this work presents the design and fabrication of piezoresistive flexible tactile sensors using additive fabrication methods. The sensing elements of the sensors are carbon nanotubes-based composites which have been prepared and extruded with direct ink writing to form 2-dimensional and 3-dimensional structures with different shapes and sizes. The extrusion of carbon nanotubes-based composites into 3-dimensional shapes is still in its infancy, therefore this work is a contribution to demonstrate successful printed 3-dimensional structures with good electrical and mechanical properties for sensors applications.