• The Science & Technology
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• v.29 no.6 s.325
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• pp.82-83
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• 1996

컴퓨터로 무장한 초현대식 장비 앞에서 돼지머리랑 시루떡을 쌓아놓고 절을 하며 고사를 지낸다. 기계한테 잘 봐 달라고 비는 것이다. 기계를 두려워 하는 일은 마침내 기계에 익숙한 사람들을 존경하게 만들었다. 과학하는 정신, 기술을 숭상하는 정신이 무엇인가를 다시 한번 생각해 본다.

• The Journal of the Convergence on Culture Technology
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• v.6 no.2
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• pp.553-560
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• 2020

In the existing research paper, we developed Mechanical Pressurizing Equipment(MPE) that can apply a certain amount of pressure and found out about improving the bonding strength of repair materials constructed in the repair section, and if pressurized, the bonding strength could be increased. In this study, the pressure of Mechanical Pressurizing Equipment(MPE) was changed to 0, 10, 30, 50, and 80 kPa, and the test was conducted to select effective pressure by measuring the flexural, compressive, and bonding strength of the specimens and deformation of the pressure plate at the age of 3 and 28th days. As a result of the test, 30 kPa was the most efficient pressure for the MPE. After producing the specimen with three types of repair materials with different main components, the bonding strength was measured according to dry and wet conditions, construction site (ceiling, wall and floor), and whether or not pressurized, on the 3rd, 7th, 14th, and 28th, indicating that the repair materials mixed with cellulose fiber was most effective for the MPE.

• 기계와재료
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• v.12 no.2 s.44
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• pp.70-78
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• 2000

• 기계와재료
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• v.17 no.2 s.64
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• pp.94-107
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• 2005

• 기계와재료
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• v.17 no.4 s.66
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• pp.95-100
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• 2005

• 기계와재료
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• v.12 no.4 s.46
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• pp.14-25
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• 2000

• 기계와재료
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• v.11 no.2 s.40
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• pp.30-36
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• 1999

• 기계와재료
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• v.17 no.1 s.63
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• pp.72-85
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• 2005

• The Safety technology
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• no.117
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• pp.64-69
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• 2007

• Design & Manufacturing
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• v.16 no.3
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• pp.58-65
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• 2022

Micro-fluidic chip has been fabricated by lithography process on silicon or glass wafer, casting using PDMS, injection molding of thermoplastics or 3D printing, etc. Among these processes, 3D printing can fabricate micro-fluidic chip directly from the design without master or template for fluidic channel fabricated previously. Due to this direct printing, 3D printing provides very fast and economical method for prototyping micro-fluidic chip comparing to conventional fabrication process such as lithography, PDMS casting or injection molding. Although 3D printing is now used more extensively due to this fast and cheap process done automatically by single printing machine, there are some issues on accuracy or surface characteristics, etc. The accuracy of the shape and size of the micro-channel is limited by the resolution of the printing and printing direction or layering direction in case of SLM type of 3D printing using UV curable resin. In this study, the printing direction and thickness of each printing layer are investigated to see the effect on the size, shape and surface of the micro-channel. A set of micro-channels with different size was designed and arrayed orthogonal. Micro-fluidic chips are 3D printed in different directions to the micro-channel, orthogonal, parallel, or skewed. The shape of the cross-section of the micro-channel and the surface of the micro-channel are photographed using optical microscopy. From a series of experiments, an optimal printing direction and process conditions are investigated for 3D printing of micro-fluidic chip.