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순차 프로그램내의 루프구조를 병렬수행하기 위한 변환 알고리즘에 대한 연구
유계성(Gae-Seong You),홍만표(Man-Pyo Hong) 한국정보과학회 1990 한국정보과학회 학술발표논문집 Vol.17 No.2
루프 구조를 병렬 처리하는 것이 컴퓨터 시스템의 성능을 크게 향상시킨다는 것은 잘 알려진 사실이다. 그러므로 순차 프로그램-특히 루프구조-내에 내재된 병렬성을 탐지해 내고, 병렬 처리를 위해 재구성하는 것은 매우 바람직하고, 또한 까다로운 작업이다. 본 논문에서는 이러한 점에 촛점을 맞추고, CRAY-Ⅱ 시스템에서 수행되어 지는 FORTRAN 프로그램에 대한 병렬성 탐지와 벡터와 방식에 대해서 설명하고, 루프 구조를 병렬화 하기 위해 필요한 데이타 종속성 분석 알고리즘을 설계하였고, 분석된 자료로 부터 루프 구조가 갖는 종속성을 변환하거나 제거하기 위한 알고리즘을 소개한다.
Low-Temperature Synthesis of Near-Monodisperse Globular MoS2 Nanoparticles with Sulphur Powders
Hui Wang,Xuequan Li,Kai Yan,유계성,Weixing Song,Ting Shen,Dechun Zou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.8
Nanoparticles (NPs) with high uniformity have been extensively investigated for their excellent chemical stability. Near-monodisperse globular MoS2 NPs were prepared with sulphur powders (SPs) as a sulphur source by a one-pot polyol-mediated process without surfactants, transfer agents and toxic agents at 170–190 ℃. The as-processed SPs greatly affected the formation of the MoS2 NPs after low-activity sulphur (S8)n was reassembled from common SPs (S8). The average size of MoS2 NPs can be reduced remarkably from 100–200 nm to 50 nm by introducing low amounts of MnCl2. A preliminary four-step growth mechanism based on the aggregation-coalescence model was also proposed. This green and simple method may be an alternative to the common hot-injection and heating-up methods for the preparation of monodisperse NPs, particularly transition metal dichalogenides.
A novel flexible micro-ratchet/ZnO nano-rods surface with rapid recovery icephobic performance
왕만상,Wenbo Yu,Yupei Zhang,우재영,Yucheng Du,Bo Wang,Yanbin Yun,유계성,이중기,Lei Wang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
In this communication, we present a significant method to fabricate a robust icephobic surface on a flexible polymer substrate. The flexible functional surface is obtained by integrating both soft-lithography and crystal growth methods. Modified by the materials with low surface free energy, the composite surface exhibits a robust superhydrophobicity at not only room temperature but also low temperature. After freezing test, the surface can recover to its original function quickly, which has achieved the level for industrial application, and also performed significant role for enhancing the icephobic theories.