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Optimizing Reversible Data Hiding using Sparsity-informed Bit-plane Encryption
Rajeev Kumar(쿠마르 라지브),Ki-Hyun Jung(정기현) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
The advent of digital technology has contributed to an increase in data security challenges. Data hiding plays a crucial role in ensuring the protection, security, and authenticity of information exchanged between various users. In this paper, a novel reversible data hiding technique is introduced for encrypted images, which utilizes blocks of different sizes based on the sparsity of the bit-plane. The proposed method employs difference-preserving encryption after block rotation and bit shuffling within blocks. The high correlation among different block sizes allows the identification and embedding of a large number of embeddable bits. Experimental results reveal that the proposed technique significantly enhances the embedding capacity in comparison to existing methods.
이종네트워크에서 펨토셀의 스펙트럼 공유할당 비용 최적화 알고리즘
박상혁 ( Sang Hyuk Park ),맹세영 ( Seayoung Myeong ),라지브 ( Rajeev ),쿠마 ( Cuma ),원종호 ( Jongho Won ),바트 ( Bate ),김경호 ( Gyeongho Kim ),이연우 ( Yeonwoo Lee ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
본 논문에서는 최근 주파수 자원에 대한 수요가 급증하면서 효율적으로 주파수를 이용하기 위해 주파수 공유를 하면서 생길 수 있는 비용문제의 최고의 이득을 발생시킬 수 있도록 하기 위하여 이종 네크워크(Heterogeneous Network)에서 매크로셀과 펨토셀 환경에서 스펙트럼 공유에 있어서 매크로셀이 사용하지 않는 스펙트럼을 펨토셀에 공유해줌으로써 이득을 취할 수 있는데 이러한 이득에 있어서 최고의 이득을 발생시킬 수 있도록 하기 위하여 펨토셀의 스펙트럼 공유당 비용 최적화 알고리즘을 제안 하였다.
Kyungwon Min(민경원),Liu Bing(리우 빙),Sang-Ryong Lee(이상용),Rajeev Arora(라지브 아로라) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Supplemental calcium (Ca2+)fertilization has been reported to enhance plant tolerance against various abiotic stresses, however, its effect on freezing tolerance has not been well studied. We investigated the effect of Ca2+supplementation on freezing tolerance of spinach (Spinacia oleracea L.) at whole-plant as well as excised-leaf level. Seedlings supplemented with 20 and 25 mM Ca2+ through sub-irrigation efficiently assimilated Ca2+, evident by higher leaf-Ca2+ content. Supplemental Ca2+ did not impede leaf-growth(leaf-area) but slightly increased dry weight / fresh weight ratio compared to the control. Supplemental Ca2+ significantly improved freezing tolerance as evident by reducing K+/Mg2+/total ion-leakage (i.e. indicative of less membrane damage), alleviating oxidative stress (less accumulation of O2 and H2O2), and enhancing PSII potential quantum yield /energy trapping efficiency (Fv/Fm) following a relatively moderate or severe freeze-thaw stress, i.e., -5.5 and -6.5 ˚C. Improved freezing tolerance by Ca2+ supplementation was paralleled by enhanced activities of antioxidant enzymes, super oxide dismutase (SOD), catalase(CAT), and ascorbate peroxidase (APX). Our data further suggests that, besides abolstered antioxidant status, improved freezing tolerance of Ca2+-fed seedlings may also be associated with reduced loss of Ca2+ from plasma membrane (due to lower abundance of leaked K+ in extra cellular spaces) as well as due to increased mechanical strength of cell wall as evident by cell wall augmentation.