• The KIPS Transactions:PartC
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• v.11C no.1
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• pp.55-62
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• 2004

The web-based technology allows anybody who has access to the Internet to get all kinds of information from the World Wide Web. It brings about issues regarding intellectual property and copyright threats. After content is downloaded, no further protection is provided on the content that has been accessed. DRM (Digital Right Management) technologies came out to ensure the protection of copyrighted content and information. In this paper, we propose architecture of license-based digital rights management system for protection of contents and principles' rights such as contents creators, providers, distributors, and uses in contents distribution value-chain over Internet. This system makes on-line processing of all value-chain from creator to purchaser possible, compared with existing DRM products only supporting only limited distribution between distributor and purchaser.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1107-1110
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• 2002

본 논문에서는 현재 컨텐츠에 대한 저작권보호 기술로 활발히 연구되고 있는 워터마킹 기술과 핑거프린팅 기술에 대해 알아보고 핑거프린팅 기술의 구현시 문제시 되고 있는 공모공격의 유형을 분석한다. 워터마킹 기술은 소유권주장이 목표인 반면 핑거프린팅 기술은 사용자인증을 목표로 하는 것이 다르다. 즉, 판매되는 컨텐츠에 구매자(사용자)의 정보를 워터마크로 삽입한 후 배포하고 후에 불법복제가 의심되는 컨텐츠에 대해 적법구매자의 워터마크를 추출하여 불법재분배를 증명한다. 이는 불법복제가 어느 구매자로부터 이루어졌는지의 추적이 가능하게 한다. 하지만 핑거프린팅 기술은 워터마킹 기술과는 다르게 구매자 정보를 워터마크로 사용하기 때문에 마크가 삽입된 컨텐츠마다 서로 다르다는 특징을 갖는다. 의도적인 공격자는 이 특성을 이용하여 여러개의 핑거프린팅된 컨텐츠를 공모(collusion)하여 워터마크를 제거하기 위한 다양한 공격(attack)을 가할 수 있다. 평균화(averaging)공격과 모자익(mosaiking)공격이 공모공격의 대표적인 방법으로, 본 논문에서는 이러한 공격유형을 분석하고 공모공격에 강인한 핑거프린팅 삽입/추출방법을 고찰한다.

• The KIPS Transactions:PartD
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• v.11D no.6
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• pp.1335-1340
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• 2004

This study introduces a technology utilizing digital images as electronic money by inserting watermark into the images. Watermarking technology assign contents ID to images and inserts the contents ID into the images in an unnoticeable way. The server that manages the issue and the usage of mage electronic money (called ‘WaterCash’ hereafter) stores issued contents ID to database and manage them as electronic money. WaterCash guarantees anonymity and prevents the forgery and modification of WaterCash based on semi-fragile watermarking technique. In addition, WaterCash is transferable and the illegal use of WaterCash can be prevented based on the watermarking technology. The watermarking .technology used in this paper was designed to be robust to image compression but vulnerable to intentional or non-intentional Image processing.

• Journal of the Korean Society for Heat Treatment
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• v.29 no.5
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• pp.209-215
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• 2016

In this study, the effect of Nb contents and processing parameters on dynamic recrystallization behaviour of 0.15C-0.2Si-0.5Mn low-carbon steels was investigated. Three kinds of steel specimens with different Nb contents were fabricated and then high-temperature compressive deformation test was conducted by varying reheating temperature (RT), deformation temperature (DT), and strain rate (SR). The Nb2 and Nb4 specimens containing Nb had smaller prior austenite grain size than the Nb0 specimens, presumably due to pinning effect by the formation of carbides and carbonitrides precipitates at austenite grain boundaries. The high-temperature compressive deformation test results showed that dynamic recrystallization behavior was suppressed in the specimens containing Nb as the strain rate increased and deformation temperature decreased because of pinning effect by precipitates, grain boundary dragging effects by solute atoms, although the compressive stress increased with increasing strain rate and decreasing deformation temperature.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1711-1714
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• 2015

스마트 디바이스가 사회와 소통할 수 있는 도구가 되었음에도 불구하고 아직까지 노인들이 사용하기에는 어려움이 있다. 여기에 음성인식 기술을 이용한 음성인터페이스를 활용함으로써 노인들의 스마트 디바이스에 대한 사용성을 높일 수 있다. 하지만 일반적인 음성인식 시스템은 청장년의 발성 스타일에 맞춰져 있기 때문에, 노화된 노인의 발성이 그대로 입력될 경우 음성인식률이 하락한다. 본 연구에서는 노인의 음절 별 발화속도가 일반적인 음성인식 시스템의 성능을 보증할 수 있는 범위를 벗어나는 경우가 많다는 분석 결과를 토대로 노인의 음절 별 발화속도를 조정한 결과 노인남녀 평균 음성인식률이 15.3% 상승하였다. 이처럼 노인의 음성인식 오류 원인들 중 하나인 발화속도의 재조정으로 음성 인식률을 높일 수 있는 토대를 마련하였다. 이는 노인들이 스마트 디바이스를 이용하여 쉽고 정확한 작업을 수행할 수 있게 됨으로써, 노인들의 사회 참여와 정보 획득이 용이해 지고 더 나아가 세대 간의 소통에도 이바지할 것으로 기대한다.

• Journal of Ceramic Processing Research
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• v.19 no.5
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• pp.407-412
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• 2018

In this study, we have made a cement based inorganic insulation material and added CSA (Hauyne Clinker) to reduce the demolding time and enhance the handling workability. CSA contents were varied by 0%, 1%, 3%, 5% and the atmospheric steam curing was tried for enhancing the compressive strength. As the CSA contents are increased to 5%, a rapid reaction of hydration caused the sinking of the slurry. So, the setting-retarder was added to control the reaction of hydration. By this, the sinking of the slurry was controlled but the height of the green body after expansions was a little bit lowered. In the CSA-added slurry, it was possible to demold within 24 hours and in case of CSA 5%-added, the sufficient workability was secured. Atmospheric steam curing (temperatures $-40{\sim}80^{\circ}C$, for 6~10 hrs.) was attempted to improve the compressive strength and found that an excellent strength of 0.25 MPa was achieved at $80^{\circ}C$ for 8 hrs. Specific gravity was about $0.12{\sim}0.13g/cm^3$ and heat conductivity was about 0.045 W/mK in all specimens. This strategy significantly improves the compressive strength of CSA 5%-added specimen up to 25% compared to without CSA added specimen.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.55 no.3
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• pp.278-283
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• 2022

To develop a value-added anchovy Engraulis japonicus sauce, we examined processing conditions and quality characteristics of rapidly fermented, high purity anchovy sauce (RPAS) by adding 30% (w/w) intermediate salt-fermented anchovy material. RPAS had higher total nitrogen and amino nitrogen contents, and lower salinity than traditional anchovy sauce (TAS). The total amino acid contents of RPAS and TAS were 17,626.8 and 12,808.2 mg/100 g, respectively, and the major amino acids were alanine, glutamic acid, lysine, cystine, valine, and leucine. The histamine contents of RPAS and TAS were 12.6 and 25.2 mg/100 g, respectively, and the protease activity levels were 0.851 and 0.595 unit/mg, respectively. These results demonstrate that RPAS was more flavorful, and could shorten the salt-fermentation period by more than half compared to TAS, and can serve as a high-end fish sauce.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.55 no.4
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• pp.417-424
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• 2022

To develop a value-added anchovy Engraulis japonicus sauce, the processing conditions and quality characteristics of a rapidly fermented and high-purity anchovy sauce (RRAS) were examined by adding 5-10% (w/w) radish Raphanus sativus L. RRAS exhibited higher yield, total nitrogen content, and amino nitrogen and calcium contents as well as lower salinity than those of conventional anchovy sauce (control). The salinity, yield, and total amino acid contents of RRAS and control were 17.2-17.7% and 19.6%, 81.2-88.7% and 61.0%, and 13,117.8-14,174.9 mg/100 g and 10,041.1 mg/100 g, respectively. The major amino acids recorded were aspartic acid, glutamic acid, alanine, valine, isoleucine, leucine, phenylalanine, ornithine, lysine, and histidine. The histamine contents of RRAS and control were 8.3-8.6 mg/100 g and 19.2 mg/100 g, respectively, while the protease activity levels were 0.901-0.958 unit/mg and 0.695 unit/mg, respectively. Overall, this study establishes that RRAS can not only significantly shorten the salt fermentation period, but can also serve as an anchovy sauce with superior nutritional quality and higher levels of amino acid and calcium.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.917-920
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• 2010

Web 2.0 시대를 대표하는 핵심적인 컨텐츠는 단연 UCC이다. 사용자가 직접 만드는 컨텐츠를 의미하는 UCC는 유투브, 아프리카TV 등을 통하여 많은 수익을 거두며 관련 업계의 주목을 받고 있으나 복제와 수정, 전송이 쉬운 인터넷 환경에서 많은 저작권 문제를 내포하고 있다. 최근에는 웹을 중심으로 CCL을 통해 자신의 저작물에 대한 허용조건을 명시하여 다른 사용자에게 명시된 조건하에서 자유롭게 저작물을 이용할 수 있게 하는 방법이 널리 이용되고 있다. 그러나 CCL로 허용된 컨텐츠를 이용함에 있어서 CCL의 누락 및 위변조를 통해 저작물을 불법으로 이용하는 행위가 증가하고 있어 CCL 활성화의 장애물이 되고 있다. 또한 다양한 응용프로그램에 CCL을 적용하고 검증하기 위한 SW 플랫폼이 부재한 상태이다. 이에 본 논문에서는 효과적으로 컨텐츠에 CCL을 적용하고 CCL로 사용허가된 컨텐츠를 검증 할 수 있는 SW 플랫폼을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.05a
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• pp.346-348
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• 2022

Media Contents Recommendation Web Service (service name 'mobodra') is a web service that analyzes media types and genre tastes for each user and recommends content accordingly. Users select some of the works randomly provided on the web when signing up for membership and analyze their tastes based on this. Based on this analysis, preferred content for each user is recommended. In this paper, we implement a content recommendation algorithm through item-based collaborative filtering. When the user's activity data or preference is re-examined, the above process is executed again to update the user's taste.