• Korean Management Science Review
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• v.22 no.2
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• pp.99-107
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• 2005

Recently, Tang and Chanson proposed a minimum cost distribution model for replicated Web contents subject to an expiration-based consistency management. Their model is a progress in that it can consider multiple replicas via the network of servers located on the Web. The proposed greedy heuristic, however, has an undesirable feature that the solution tends to converge a local optimum at an early stage of the algorithm. in this paper, we propose an algorithm based on a simple idea of preventing the early local convergence. The new algorithm provides solutions whose cost are, on the average, 27$\%$ lower than in the previous algorithm.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2008.10b
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• pp.87-90
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• 2008

디지털 워터마킹은 디지털 콘텐츠에 워터마크를 삽입함으로써 불법적인 복제를 방지하고, 지적재산권 및 저작권을 보호하며, 소유권을 주장할 수 있는 근거를 제시하는 기술이다. 기존의 워터마킹 기법에서는 워터마크를 삽입함으로써 데이터 왜곡과 품질 저하가 불가피하다는 단점이 있다. 이를 극복하기 위하여 원래 데이터를 변경하지 않는 제로-워터마킹 기법들이 제시되고 있다. 이 논문에서는 VQ(Vector Quantization) 방식의 블록 효과를 줄이고, 압축 비율과 품질을 향상시킨 SMVQ(Side Match Vector quantization) 방식에 대한 제로-워터마킹 체계인 CSMVQ(Chaotic SMVQ)를 제안한다. SMVQ 이미지 압축에서는 동일하게 두 이웃 블록의 접면 정보를 이용하기 위하여 좌측 상단에서 우측 하단으로 진행되므로, 임의의 순서로 블록을 선택하여 워터마크를 삽입하기 어렵다. CSMVQ에서는 이전에 부호화된 이웃 블록들의 접면 정보의 일치성을 동적으로 고려하여 부호화를 진행한다. 그러므로 무질서한 방식으로 워터마크가 삽입되도록 지원할 수 있다.

• Review of KIISC
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• v.11 no.5
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• pp.1-17
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• 2001

인터넷의 발전과 대량의 디지털 정보를 활용할 수 있는 기반이 성숙됨에 따라 디지털 정보가 인터넷 환경에서 이용 가능한 디지털 형태로 제작되어 활발하게 유통되고 있다. 향후 디지털 컨텐츠의 유통 및 사용이 일반화 될 것이며, 컨텐츠 유통시스템 구축이 매우 중요하게 될 것이다. 그러나 현재의 디지털 컨텐츠 유통 체계는 저작권 및 컨텐츠 사용권, 불법재생 및 복제에 대해 무방비 상태에 있다고 해도 과언이 아니다. 그런 현재의 디지털 컨텐츠 유통에 있어서, 개별적인 컨텐츠를 보호할 수 있는 기술이 필수적으로 요구되고, 디지털 컨텐츠 저작권 보호기술의 개발을 위하여 국내외 여러 단체들이 활발히 활동중이다. 본 논문에서는 이러한 배경으로부터 디지털 컨텐츠의 개념, 저작권 보호기술의 목적 및 분류체계에 대하여 검토하고, 컨텐츠 보호기술 및 표준화 동향을 살펴본다. 또한 저작권 보호서비스 사례를 분석함으로서 저작권 보호기술의 응용 분야와 향후 전망에 대해 논한다.

• The KIPS Transactions:PartC
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• v.11C no.5
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• pp.697-702
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• 2004

As for the digital content, a reproduction is easy and manuscript is identical with original copy. Because of these characteristics, there are difficulties on prevention of an illegal reproduction and an illegal currency. In recent days various digital content service systems based on a web are commercialized. An appropriate copyright protection technology is required so that these systems develop as a profit model. Generally we use encrypted digital content transmission method for the copyright protection on a web base system. At the time of this, it is increased sire of encrypted digital content. As for this, it be increased time required on an execution process. Therefore, a design of the system that considered a execution time and a security is required. In this study, we designed the digital content transmission system that considered execution time and a security through a partial encryption based on a digital content copyright management technique. Also we evaluated performance of a proposed system through analysis.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.9
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• pp.1941-1948
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• 1997

In this paper, the power efficient linear upconversion mixer which is a functional circuit in transmit path of intermediate frequency(IF) part of Code Division Multiple (CDMA) cellular phone was explained. In generally, the low CMOS devices limits the implementation of upconversion mixer especially for lower loads. Using replica transconductor, the linear range is extended up to the limit. Thiscircuit was imprlemented using $0.8{\mu}\textrm{m}$ N-well CMOS technology with 2-poly/2-metal. The active area of chip is $0.53mm{\times}0.92mm$. The power consumption is 30mW with 3.3V suply voltage. The 1dB conpression characteristics is -27.3dB with $25{\Omega}$. load and being applied by 2-tone input signal. The mixer operates properly above 200MHz.

• 보존과학연구
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• s.32
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• pp.171-183
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• 2011

In this study molecular genetic analysis was carried out on 4 human skeletal remains from Osuri, Buyeo. We showed that real-time PCR is the method of the choice to assess the initial number of genuine ancient DNA molecules. Human mitochondrial DNA quantification was accomplished by the real-time PCR for the cytochrome b gene of the mitochondria. Histological results proved to be a good potentiality for biochemical analysis using biomolecule. The level of specimen's preservation state was proved that level of quantitative result was BO-04, BO-01, BO-03, BO-02. Continually, we showed that biochemical and biomolecule results for the level of preservation state were similar. This study will be useful to important material for predicting biochemistry and biology analysis of the ancient bone.

• Journal of Science and Technology Studies
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• v.5 no.2 s.10
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• pp.23-47
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• 2005

This study explores the way of prescribing the ethic of science in korean society in the 2004 ethical debates about 'Hwang woo-suk' embryo stem-cell study. It is the process of ethical communication. The debate includes very sensitive problem such as ovum and embryo, which is related directly with life. Particularly, this issue has many implications as there was a wild enthusiasm of patriotism in Korean society after had published Prof. Hwang's paper. This case shows dramatically the formation of ethical attitude in our society. There were included many actor's desire, interest, and conflicts. This study analyzes the process of competition to seize the initiative of the definition of ethics. It includes patriotic discourse, competition of rhetorics. This ethical communication involves the making of 'star scientist', Hwang woo-suk. In consequence, the ethics has been marginalized and stigmatized as anti-science on the stage of star scientist. This study argues ethics is not a fixed thing, it is construction of competition.

• Journal of the Korean Society for information Management
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• v.19 no.2
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• pp.181-201
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• 2002

As Information Technology has developed, digital library has an opportunity to change the paradigm of role of library to adjust in digital environment. Digital library has promote information services with digitization of materials. In library fare use is allowed to the public for information services. However, digital copy and transmission is simple in digital environment, to balance between owner and user is not easy but important things. Therefor, current copyright act is revised to adjust these environment but the act restrict the users'accessing digital library through interned, not complied with the motive of revision. Moreover, proposed act which is proposed to facilitate digital library services also extremely limits information services. In this monograph, I will review the copyright act related library and seek for the improved means.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.7
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• pp.563-572
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• 2013

Based on this paper, in case of the on-line account system in finance industry temporarily stops working because of the on-line data change from 00:00 to 00:30, it conducts in extra placement server and the director update is carried out via center cut or on-line server to make the service possible through customer director reproduction revision. So, from the simulation result in financial operating system, We retain the batch director & backup director securely about the important time data in each account classes on-line director without even one second interruption.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.4
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• pp.177-186
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• 2003

DRM(Digital Rights Management) is a technology that manages secure distributions and copyrights of digital contents on the Internet. It is general giving the rights to use the encrypted contents that are downloaded by a simple authorization process in the existing DRM system. Once this is done you are allowed to access. In this paper, we use RTP(Real-time Transport Protocol) for end-to-end real-time data transmission. And the system is designed to make it Possible to Protect copyrights and to distribute contents with safety through periodic authentication. We implemented DRM system to stand this basis. The proposed system vests only authorized users with authority to access the license. Hence it prevents contents to be distributed and copied illegally on networks.