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유승영,손용하,정현도,윤병규,곽채수,이주형 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Electrically conductive inks for additive manufacturing or “3D printing” have received substantial attention in the past few years in various printed electronics applications. Here, we perform a formulation study on development of a light-weight electrically conductive copper (Cu)-bee pollen composite ink for 3D printing. Addition of naturally occurring bee pollen microparticles to an aqueous Cu suspension reduces the overall density of final extruded structure yet increases the suspension strength. Emulsification of the aqueous suspension ink with a fast evaporating oil phase significantly reduces the sample yield strength, by which the rheological ink processability is much improved while the particle percolation in the continuous phase is maintained. Furthermore, the final extruded structure of ink in the form of emulsion has much lower density due to the increased porosity as a consequence of oil evaporation.
Practical FHE parameters against lattice attacks
천정희,손용하,이동건 대한수학회 2022 대한수학회지 Vol.59 No.1
We give secure parameter suggestions to use sparse secret vectors in $\LWE$ based encryption schemes. This should replace existing security parameters, because homomorphic encryption (HE) schemes use quite different variables from the existing parameters. In particular, HE schemes using sparse secrets should be supported by experimental analysis, here we summarize existing attacks to be considered and security levels for each attacks. Based on the analysis and experiments, we compute optimal scaling factors for CKKS.