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짧은 정수해 문제들 사이의 관계를 통한 암호시스템의 공격 가능성
구자현(Zahyun Koo),노종선(Jong-Seon No) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문은 환 상에서 정의된 짧은 정수해 문제 (RSIS)와 모듈상에서 정의된 짧은 정수해 문제 (MSIS)의 관계를 소개하고 이를 통해 암호 시스템의 공격 가능성에 대해 살펴본다. 두 문제 사이의 관계는 특정 매개변수들에 의해 성립되기에 암호시스템이 특정 매개변수들 사이의 관계를 만족하는지 확인하였다.
단일 키와 다중 키를 갖는 동형암호의 차이에 대한 연구
구자현(ZaHyun Koo),노종선(Jong-Seon No) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문은 단일 키를 갖는 동형암호와 다중 키를 갖는 동형암호의 차이에 대해 살펴본다. 특히 실수간 연산을 지원하는 동형암호인 RNS-CKKS와 다중 키를 갖는 RNS-CKKS에 대해 어떤 차이점이 있는지 살펴본다.
Oh Kim, Jun,Ku, Zahyun,Krishna, Sanjay,Kang, Sang-Woo,Jun Lee, Sang,Chul Jun, Young,Urbas, Augustine American Institute of Physics 2014 Journal of Applied Physics Vol.115 No.16
<P>We propose and analyze a novel detector structure for pixel-level multispectral infrared imaging. More specifically, we investigate the device performance of a grating-integrated quantum dots-in-a-well photodetector under backside illumination. Our design uses 1-dimensional grating patterns fabricated directly on a semiconductor contact layer and, thus, adds a minimal amount of additional effort to conventional detector fabrication flows. We show that we can gain wide-range control of spectral response as well as large overall detection enhancement by adjusting grating parameters. For small grating periods, the spectral responsivity gradually changes with parameters. We explain this spectral tuning using the Fabry-Perot resonance and effective medium theory. For larger grating periods, the responsivity spectra get complicated due to increased diffraction into the active region, but we find that we can obtain large enhancement of the overall detector performance. In our design, the spectral tuning range can be larger than 1 mu m, and, compared to the unpatterned detector, the detection enhancement can be greater than 92% and 148% for parallel and perpendicular polarizations. Our work can pave the way for practical, easy-to-fabricate detectors, which are highly useful for many infrared imaging applications. (C) 2014 AIP Publishing LLC.</P>
Low temperature metal organic chemical vapor deposition grown MoS₂ nanoflowers
Jaese Park,Jun Oh Kim,Jun Oh Kim,Jihun Mun,Zahyun Ku,Sang-Woo Kang 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
MoS<sub>2</sub> NFs have received considerable attention due to their inherently distinctive structure and extraordinary properties<sup>1</sup>. We report a simple MOCVD method that can grow high crystal quality MoS<sub>2</sub> NFs through controlling the partial pressure ratio (P<sub>SR</sub>/P<sub>MoP</sub>) of the H<sub>2</sub>S gas to the No(CO)<sub>6</sub> precursor. We investigate microscopically and spectroscopically that the fundamental properties of the grown MoS<sub>2</sub> NFs can be controlled by adjusting the PSR/PMoP from 1.15 to 1.9. It is also shown that the LT-MOCVD can regulate the petal size of MoS<sub>2</sub> NFs through the growth time, thereby controlling PL intensity.