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이혜주,최범석,홍진우,석종원,Lee Hyejoo,Choi BumSeok,Hong Jinwoo,Seo Jongwon 한국정보처리학회 2004 정보처리학회논문지 C : 정보통신,정보보안 Vol.11 No.6
디지털 콘텐츠의 이용 증가와 함께 디지털 콘텐츠의 저작권 보호 및 유통이 점점 부각되고 있으며 이를 위한 디지털 저작권 관리(DRM, digital rights management) 기술은 다양한 종류의 디지털 콘텐츠 뿐만 아니라 저작권 권리를 보호하기 위해 적용 가능하다. 뿐만 아니라, 디지털 방송 기술 도입과 개인용 비디오 녹화기와 같은 저장 장치의 등장으로 저장되는 디지털 방송 콘텐츠에 대한 보호 기술도 요구되어 지고 있다. 현재 방송 콘텐cm에 대한 보호 방법은 특정 채널에 대한 시청자의 접근을 제어하는 제한 수신 시스템(CAS, conditional access system)으로, 이것은 디지털 방송 콘텐츠의 자유로운 콘텐츠 2차배포를 제한시킨다. 본 논문에서는 불특정 다수를 대상으로 방송되는 방송 콘텐츠에 대한 저장과 사용을 제어하고 자유로운 2차배포(superdistribution)를 허용하기 위해 암호화와 라이센스를 이용하는 DRM의 개념을 적용하고 각 부분들의 기능 검증을 위한 구현 결과를 보인다. 본 논문의 구현 시스템은 시청자의 STB(Set-top box)에 방송콘텐츠의 녹화를 허용하고, 사용자에 의한 2차배포가 가능하다는 장점이 있다. 따라서, 콘텐츠 제공자와 소비자 모두에게 신뢰성 있는 콘텐츠 보호 및 유통환경을 제공가능하다. With the increase of digital content usages, the protection for digital content and intellectual property becomes more important. The DRM(digital rights management) technologies are applicable to protect not only any kind of digital contents but also intellectual property. Besides such techniques are required for recorded digital broadcasting contents due to introduction of digital broadcasting techniques and storage devices such as personal video recorder. The conventional protection scheme for broadcasting content is the CAS(conditional access system) by which the access of viewer is controlled on the specific channels or programs. The CAS prohibits the viewer from delivering the digital broadcasting content to other person, so it results in restriction of superdistribution on the digital broadcasting content. In this paper, for broadcast targeting unspecfic many people, we will design the service model of the protection and distribution of digital broadcasting content using encryption and license by employing the concept of DRM. The results of implementation are also shown to verify some functions of each component. An implemented system of this paper has some advantages that the recording of broadcast content is allowed on set-top-box and superdistribution is available by consumer. Hence it provides content providers and consumers with trustworthy environment for content protection and distribution.
박준영(JunYoung Park),최범석(BumSeok Choi),한상조(SangJo Han),고희환(HeHan Ko),정철영 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, the performance of a reversible fan according to the stacking method was studied by the numerical analysis method. The accuracy of numerical results were confirmed by comparison with experimental results. The original blade was stacked on the point which located a little far from center of gravity toward leading edge on the camber line. The stacking methods based on the leading edge and center of gravity were tried in this study. The performance maps and flow fields of three cases are compared.
김수용(SooYong Kim),김대승(DaeSeung Kim),최범석(BumSeok Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In most of the cases, the size of gas turbine unit depends on flow rate through it. It is generally known that, with a cooling air of 1%, gas turbine cycle efficiency drops about 1.2% and therefore determination of cooling mass flow rate and its properties is very important to both economy and performance of the gas turbine unit. The maximum efficiency of gas turbine unit occurs at turbine inlet gas temperature around T<SUB>c</SUB>=1600℃ and further increasing the temperature only leads to lowering the thermal efficiency due to significant increase of loss caused by cooling. Therefore, effective description of temperature distribution around the blade and disk will help in selecting the optimum amount of cooling flow rate and is important for practical engine design. Particulars related to heat exchange between cooling air and materials surface is considered in this report.