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오늘 본 자료
보간법과 개선된 JPEG 예측을 통한 스테가노그래픽 기법 연구
전병현,이길제,정기현,유기영,Jeon, Byoung-Hyun,Lee, Gil-Jae,Jung, Ki-Hyun,Yoo, Kee-Young 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.2
The previous steganographic methods by using the interpolation were difficult to estimate the distortion because the size of cover image is extended by interpolation algorithms. In this paper, to solve the problems of previous methods proposed the improved steganographic method based on the pixel replacement algorithms. In our method, we cannot extend a cover image, but also can estimate exactly the distortion of the stego-images. In the experimental results, the estimated distortion and embedding capacity of stego-image are shown on three pixel replacement methods.
Momentum crashes and the 52-week high
Suk-Joon Byun(변석준),Byoung-Hyun Jeon(전병현) 한국경영과학회 2016 한국경영과학회 학술대회논문집 Vol.2016 No.10
Despite their strong performance, momentum strategies suffer from occasional large drawdowns referred to as momentum crashes. In this paper we address the question of why momentum crashes by identifying its cross-sectional determinant: nearness to 52-week high. We provide robust empirical finding that stocks far from their 52-week highs outperform stocks near their 52-week highs during the momentum crash periods, and the momentum crash is just a manifestation of such outperformance. We consider several explanation for the outperformance and find that inflow of anchoring susceptible investors is the most consistent explanation. Furthermore, we provide a revised momentum strategy that is neutral on nearness to 52-week high. The strategy is free of crashes and exhibits a normal-like distribution without sacrificing its profitability.