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- 저자 : 김기범(Kibeom Kim) (검색결과 59 건)
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김기범,조영호,Kim, Kibeom,Cho, Youngho 한국인터넷정보학회 2022 인터넷정보학회논문지 Vol.23 No.5
Botnets have been exploited for a variety of purposes, ranging from monetary demands to national threats, and are one of the most threatening types of attacks in the field of cybersecurity. Botnets emerged as a centralized structure in the early days and then evolved to a P2P structure. Bitcoin is the first online cryptocurrency based on blockchain technology announced by Satoshi Nakamoto in 2008 and is the most widely used cryptocurrency in the world. As the number of Bitcoin users increases, the size of Bitcoin network is also expanding. As a result, a botnet using the Bitcoin network as a C&C channel has emerged, and related research has been recently reported. In this study, we propose an encrypted botnet C&C communication mechanism and technique in the Bitcoin network and validate the proposed method by conducting performance evaluation through various experiments after building it on the Bitcoin testnet. By this research, we want to inform the possibility of botnet threats in the Bitcoin network to researchers.
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인접 블록 움직임 벡터의 지역적 통계 특성을 이용한 고속 움직임 추정 기법
김기범(Kibeom Kim),정찬영(Chan-Young Jeong),홍민철(Min-Cheol Hong) 한국방송·미디어공학회 2008 방송공학회논문지 Vol.13 No.1
In this paper, we propose a variable step search fast motion estimation algorithm using local statistics of neighboring motion vectors. Using the degree of correlation between neighboring motion vectors, motion search range is adaptively adjusted to reduce unnecessary search points. Based on the adjusted search range, motion vector is obtained by variable search step. Experimental results show that the proposed algorithm has the capability to dramatically reduce the search points and computing cost for motion estimation, comparing to fast full spiral search motion estimation and other fast motion estimation.
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HEV차량 변속기 냉각용 전동식 오일펌프 IPMSM 고출력화 최적 설계
김기범(Kibeom Kim),김미정(Mijeong Kim),박제헌(Jeheon Park),김경엽(Kyungyub Kim),박종원(Jongwon Park) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In this paper, we design IPMSM to improve the EOP system for HEV transmission cooling. The improvements are miniaturization and high output. Pole · slot combination, shape of core, supply voltage, and demagnetization were considered in the design. Test bed was constructed to verify the performance of the designed IPMSM. It was confirmed that the IPMSM was designed as intended.
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