http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
결함허용 양자 컴퓨팅을 위한 양자 오류 복호기 연구 동향
조은영,온진호,김재열,차규일,E.Y. Cho,J.H. On,C.Y. Kim,G. Cha 한국전자통신연구원 2023 전자통신동향분석 Vol.38 No.5
Quantum error correction is a key technology for achieving fault-tolerant quantum computation. Finding the best decoding solution to a single error syndrome pattern counteracting multiple errors is an NP-hard problem. Consequently, error decoding is one of the most expensive processes to protect the information in a logical qubit. Recent research on quantum error decoding has been focused on developing conventional and neural-network-based decoding algorithms to satisfy accuracy, speed, and scalability requirements. Although conventional decoding methods have notably improved accuracy in short codes, they face many challenges regarding speed and scalability in long codes. To overcome such problems, machine learning has been extensively applied to neural-network-based error decoding with meaningful results. Nevertheless, when using neural-network-based decoders alone, the learning cost grows exponentially with the code size. To prevent this problem, hierarchical error decoding has been devised by combining conventional and neural-network-based decoders. In addition, research on quantum error decoding is aimed at reducing the spacetime decoding cost and solving the backlog problem caused by decoding delays when using hardware-implemented decoders in cryogenic environments. We review the latest research trends in decoders for quantum error correction with high accuracy, neural-network-based quantum error decoders with high speed and scalability, and hardware-based quantum error decoders implemented in real qubit operating environments.
장수민,안백송,온진호,이병규,전성익,Jang, S.M.,An, B.S.,On, J.H.,Lee, B.G.,Jun, S.I. 한국전자통신연구원 2015 전자통신동향분석 Vol.30 No.4
최근 서버 관련 에너지 소비가 꾸준히 증가함에 따라 IT부문의 에너지 효율성을 높이기 위한 IT기술의 요구가 급증하고 있다. 이러한 요구에 따라 IT시스템 운용 시 사용자로 하여금 에너지 사용 상태를 정확히 인지 및 식별 가능하도록 함으로써 이를 토대로 에너지 제어를 통한 결과를 예상할 수 있도록 하며 에너지절감 유도까지 가능하게 하는 에너지 효율성 컴퓨팅 기술이 활발히 연구되고 있다. 향후에 엑사스케일 컴퓨터나 대규모 매니코어 컴퓨터 개발에 있어서 이러한 핵심기술은 선택이 아니라 필수 요소가 될 것이다.
재활용 APT를 이용한 WO<sub>3</sub> 제조와 WC-Co 의 용사코팅
정준기,김성진,온진호,문흥수,피재환,하태권,박상엽,Chung, J. K.,Kim, S. J.,On, J. H.,Moon, H. S.,Pee, J. H.,Ha, T. K.,Park, S. Y. 한국소성가공학회 2015 소성가공 : 한국소성가공학회지 Vol.24 No.4
The possibility of chemical precipitation for recycled ammonium paratungstate (APT) was studied. WO<sub>3</sub> particles were synthesized by chemical precipitation method using a 1:2 weight ratio of APT:DI-water. At the 500℃ sintering temperature, the X-ray diffraction results showed that APT completely decomposed to WO<sub>3</sub>. For the granulated powder WC-Co, vacuum heat treatment at proper temperatures increases tap density and flow-ability. Hardness of the WC-Co thermal spray coating layer was measured in the range HV 831~1266. Spray conditions for the best characteristic values were an oxygen flow rate=1500 scfh, a fuel flow rate = 5.25gph and a gun distance = 320mm.