• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.317-320
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• 2018

기업 간에서 정보를 전달할 때, 중요한 정보를 숨기는 정보 보안 방법으로는 크게 워터마킹, 크립토그래피, 스테가노그래피 3가지가 있다. 워터마킹은 텍스트, 이미지와 같은 컨텐츠에 소유주만이 아는 마크를 사람의 육안이나 귀로는 구별할 수 없게 삽입하여 추후 소유주가 삽입한 마크를 추출함으로써 저작권 행사의 중요한 증거로 사용되는 방법이며, 스테가노그래피와 크립토그래피는 비슷하면서 다른 정보 보안 방법인데, 크립토그래피는 암호화 알고리즘을 작성하여 상대방이 이해할 수 없게끔 메시지를 작성하고 그 안에 비밀을 숨겨놓는 방식이며, 스테가노그래피는 정상적으로 보이는 컨텐츠 안에 메시지를 숨김으로써 겉으로 보기에 무해해 보이는 객체에 비밀 메시지를 은닉해 전달하는 방법으로 앞서 말한 워터마킹과는 다르게 조금 더 보안 쪽으로 치중되어 있는 방법이다. 본 논문에서는 정보 보안 방법으로 워터마킹과 스테가노그래피를 이용하는 정보 보안 알고리즘을 설계한다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.145-147
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• 2005

인터넷의 사용이 나날이 증가됨으로써 않은 양의 데이터들이 서로 공유되어지고 있으며, 데이터의 양도 나날이 증가되고 있는 추세이다. 이렇게 많은 양의 데이터들이 공유되어짐에 따라 정보보호에 대해 인지를 해야만 한다. 최근 정보보호 시스템으로 전송 매체에 비일 데이터를 직접 삽입하는 스테가노그래피 알고리즘에 대한 연구가 활발히 이루어지고 있다. 스테가노그래피는 데이터를 텍스트, 이미지, 오디오등 커버 데이터라 불리는 전송 매체에 숨겨 전송하는 방법으로 제 3자는 데이터가 숨겨져 있다는 사실 자체를 알지 못하도록 하는 것이다. 본 논문에서는 정지영상에 스테가노그래피 기법을 사용하던 기존 방식에서 좀 더 발전된 움직이는 영상에서 프레임에 데이터를 삽입하여 전송하는 방법을 제시한다. 동영상에 영향을 미치지 않는 선에서 정보를 삽입하여 제 3자는 이를 전혀 눈치채지 못하도록 한다.

• The Journal of Society for e-Business Studies
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• v.8 no.4
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• pp.167-181
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• 2003

The contents for multimedia are very activated along to revolution of Internet. So this fact allows the contents for multimedia to be commercialized. These contents , however, included much vulnerability that it is difficult to be commercialized because attackers easily reproduce that. Many developers want to use watermarking method as the technique to protect the contents for multimedia, but it is very vulnerable to use only one method. This paper proposes the Secure DRM system which protects the contents for multimedia using Public Key Infrastructure and steganography methods. The SDRM system is more powerful than general DRM systems in that it has the special feature of watermarking and steganography techniques. We can prevent the attackers from reproducing and stealing the contents illegally, and authenticating users through SDRM systems.

• Journal of Digital Contents Society
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• v.17 no.5
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• pp.433-439
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• 2016

In this paper, we propose a optimized steganography how to improve the image degradation of the existing data hiding techniques. This method operates in the compressed domain(JPEG) of an image. Most of the current information concealment methods generally change the coefficients to hide information. And several methods have tried to improve the performance of a typical steganography method such as F5 including a matrix encoding. Those papers achieved the object of reducing the distortion which is generated as hiding data in coefficients of compressed domain. In the proposed paper we analyzed the effect of the quantization table for hiding the data in the compressed domain. As a result, it found that can decrease the distortion that occur in the application of steganography techniques. This paper provides a little (Maximum: approximately 6.5%) further improved results in terms of image quality in a data hiding on compressed domain. Developed algorithm help improve the data hiding performance of compressed image other than the JPEG.

• Journal of Internet Computing and Services
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• v.4 no.5
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• pp.21-29
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• 2003

Transferring the contents for multimedia shows recently very activity, So this fact ailows the contents for multimedia to be commercialized. These contents, however, included much vulnerability that it is difficult to be commercialized because attackers easily reproduce that. Many developers want to use watermarking method as the technique to protect the contents for multimedia, but it is very vulnerable to use only one method, This paper proposes the Secure DRM system which protects the contents for multimedia steganography methods. The DRM system is more powerful than general DRM systems in that it has the special feature of watermarking and steganography techniques, We can prevent the attackers from reproducing and stealing the contents illegally, and authenticating users through DRM systems.

• Journal of Korea Society of Industrial Information Systems
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• v.18 no.5
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• pp.51-58
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• 2013

A clock duty-cycle corrector (DCC) which is an essential device of clocking circuits for high-speed system-on-chip (SoC) design is introduced in this paper. The architectures and operation of conventional analog feedback DCCs and digital feedback DCCs are compared and analyzed. A new mixed-mode feedback DCC that combines the advantages of analog DCCs and digital DCCs to achieve a wider duty-cycle correction range, higher operating frequency, and higher duty-cycle correction accuracy is presented. Especially, the architectures and design of a mixed-mode duty-cycle amplifier (DCA) which is a core unit circuit of a mixed-mode DCC is presented in detail. Two mixed-mode DCCs based on a single-stage DCA and a two-stage DCA were designed in a 0.18-${\mu}m$ CMOS process, and it is proven that the two-stage DCA-based DCC has a wider duty-cycler correction range and smaller duty-cycle correction error.

• Korean Institute of Interior Design Journal
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• no.40
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• pp.68-75
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• 2003

The purpose of this study is to find out the expression style of space in Rietveld's early works in comparison with Mondrian's paintings. Through investigating the development of their works and analyzing the composition and disposition type of elements such as point, line, plane, color in the selected works, we can draw the following conclusions. .First, Rietveld pursues the dissolution of traditional volume and the de-composition of elements as Mondrian does. Second, the painterly property of plane is emphasized by the projection of separately floating elements on the picture plane. Third, the separating the layer of lines from the layer of planes and the re-combination of these two layers present the superimpositional image of three-dimensional objects. This leads into new conception of architectural space and develops the transparency and the extension of plan in modem architecture.

• Journal of The Korean Digital Architecture Interior Association
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• v.9 no.3
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• pp.77-83
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• 2009

Van Doesburg founded the magazine De Stijl with Mondrian in 1917. De Stijl movement was influenced by Cubist painting as well as by the mysticism and the ideas about ideal geometric forms in the neoplatonic philosophy. De Stijl proposed ultimate simplicity and abstraction by using only straight horizontal and vertical lines and rectangular forms. Furthermore, their formal vocabulary was limited to the primary colours, red, yellow, and blue, and the three primary values, black, white, and grey. The works avoided symmetry and attained aesthetic balance by the use of opposition. Vertical and horizontal lines are positioned in layers or planes that do not intersect, thereby allowing each element to exist independently and unobstructed by other elements In 1924 their different concepts about space and time were split between Van Doesburg and Mondrian. Van Doesburg launched a new concept for his art, Elementarism, which was characterized by the diagonal lines and rivaled with Mondrian's Neo-Plasticism. The works of De Stijl would influence the Bauhaus style and the international style of architecture.

• Journal of The Korean Digital Architecture Interior Association
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• v.3 no.1
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• pp.9-14
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• 2003

The purpose of this study is to find out organizing strategy of de-composition works in modern plastic arts. Through investigating the development process of De Stijl painters and Rietveld's early works and analyzing the composition and disposition type of elements such as point, line, plane, color in the selected works, we can draw some conclusions. First, Rietveld pursues the dissolution of traditional volume and the de-composition of elements as Mondrian does through crossing-connection of three listels with quadrangular section. Second, Rietveld reorganized de-composition elements with detached lines and color planes. Third, Rietveld experimented possibility of new plastic space through displacing elements, opening space, making anti-gravity space.

• Food Science of Animal Resources
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• v.30 no.5
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• pp.842-850
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• 2010

Sex steroids are known to be involved in skeletal muscle development (anabolic effect) and are frequently used in medicines. It has been known that pork contains a variety of steroids that are mainly synthesized in the gonads (testis and ovary). Thus, the present study was conducted to evaluate the effects of anabolic steroids of pork on the proliferation and differentiation of myogenic satellite cells (MSC). Three different methods (M1, M2, and M3) were developed for the isolation and purification of steroids from porcine tissues. Among three extraction methods that we developed, M3 was the best method with respect to the quantities of steroids and the induction of MSC proliferation. Hormonal analysis showed that the steroid hormone levels were the highest in muscle and fat of intact male than those of castrated males and females. In addition, the highest serum levels of nandrolone and testosterone were detected in intact males, whereas estrone and $17{\beta}$-estradiol levels were similar in the entire experimental serum samples. Expression of androgen receptor (AR), myoD, desmin, and myogenin in bovine muscle cells were significantly up-regulated by the treatment of steroid extracts. The highest increas of myogenin and AR mRNA abundance were observed in the MSCs treated with M3 extract (p<0.001). Altogether, the present research showed the positive effect of steroids on MSC proliferation and differentiation in vitro. These results would certainly imply a beneficial effect of pork consumption on human muscle development.