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정기현,김점식,박문기 한국화학공학회 1970 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.8 No.2
1. This study is mainly carried out southern sea of Korea to determine effect of antifouling agents composed of synthetic organic insecticides. 2. The experimental result shows the fact that toxic agents are selectively effective and organic chlorine and phosphate compounds are effective to Balanus, and Formate derived from dithiocarbamate is also effective to marine animal other than Balanus. 3. Simultaneously the relationship between effect of other organic insecticides and variety in composition of varnishes is also determined.
세 방향 자료 은닉이 가능한 이미지 스테가노그래픽기법 연구
정기현,김인택,김재철,Jung, Ki-Hyun,Kim, In-Taek,Kim, Jae-Cheol 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.2
A steganographic method using three directional data embedding for gray images is presented in this paper. Cover image is divided into non-overlapping $2\times2$ sub-blocks and the basis pixel is selected to calculate the three different values of each sub-block. Difference values are replaced by embedding the number of secret bits that is referenced by the range table. For the three pixel pairs in the sub-block, the optimal pixel adjustment is preceded to reduce the distortion of visual quality. The experimental results show that the proposed method achieves a good visual quality and high capacity.
A Data Hiding Method of Binary Images Using Pixel-value Weighting
정기현,Jung, Ki-Hyun The Korea Institute of Military Science and Techno 2008 한국군사과학기술학회지 Vol.11 No.4
This paper proposes a new data hiding method for binary images using the weighting value of pixel-value differencing. The binary cover image is partitioned into non-overlapping sub-blocks and find the most suitable position to embed a secret bit for each sub-block. The proposed method calculates the weighted value for a sub-block to pivot a pixel to be changed. This improves the image quality of the stego-image. The experimental results show that the proposed method achieves a good visual quality and high capacity.
Image Steganographic Method using Variable Length for Data Embedding
정기현,Jung, Ki-Hyun The Korea Institute of Military Science and Techno 2008 한국군사과학기술학회지 Vol.11 No.3
Wu and Tsai's pixel-value differencing method and Chang and Tseng's side-match method are based on the theory that the number of bits which can be embedded is determined by the degree of the pixel's smoothness, or its proximity to the edge of the image. If pixels are located in the edge area, they may tolerate larger changes than those in smooth areas. However, both methods are subject to the fall off the boundary problem(FOBP). This study proposes a new scheme that can solve the FOBP. The experimental results demonstrate that the proposed method resolves the problem, and achieves a higher image quality index value than other methods.
정기현,Jeong, Gi-Hyeon 한국방위산업진흥회 2002 國防과 技術 Vol.- No.277
무기체계가 국내개발로 생산되었다 하더라도 이 무기체계의 핵심이 되는 기술 및 부품을 외국에 의존하여 개발하였다면 완전한 우리의 무기라 할 수 없고, 외국이 기술에 대한 통제력을 행사 한다면 그것은 곧 기술종속을 의미한다고 볼 수 있으며 예측할 수 없는 국제안보 환경하에서 기술종속은 곧 안보종속이 될 수 있기 때문에 주요무기체계의 핵심기술 확보는 국가안보를 위해 중요한 것이다. 그러므로 향후 우리 나라의 경우 국제협력연구개발 필요성은 증대될 것으로 전망된다. 그것은 주요 무기체계 개발을 위한 국내의 국방과학기술 수준을 볼 때 핵심기술이 미흡한 분야가 상당하므로 외국과의 협력을 필요로 하기 때문이다.