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DRM 기반의 콘텐츠 보호를 위한 패키징 알고리즘 설계
김상언 ( Sang Eun Kim ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.4
In late 1990s as the internet-based digital content distribution industry emerged as a new business model, a plethora of DRM technologies were released to prevent copyright infringement due to illegal copies. However, as digital music and e-Books, which formed the early market for the DRM technologies, got stagnant; complaints of DRM product users, mostly copyright holders, increased; and disparate DRM technologies lacked in compatibility, the DRM technology has been used to a very limited extent and the DRM packaging technology currently in use mainly focuses on either security or user-friendliness. As a consequence, both security and user-friendliness are not met concurrently. In that sense, this study is to suggest a packaging mechanism for DRM systems that meets both features.
냉간가공된 TP304 스테인리스강 모재와 용접재를 이용한 반복 변형 및 손상 거동에 미치는 중성자조사 영향 모사
김상언,김진원,Kim, Sang Eun,Kim, Jin Weon 한국압력기기공학회 2020 한국압력기기공학회 논문집 Vol.16 No.2
This study presents cyclic stress-strain and tensile test results at room temperature (RT) and 316℃ using cold-worked TP304 stainless steel base and weld metals. By comparing the cyclic hardening/softening behavior and failure cycle of cold-worked materials with those of irradiated austenitic stainless steels, the feasibility of simulating the irradiation effect on cyclic deformation and failure behaviors of TP304 stainless steel base and weld metals was investigated. It was found that, in the absence of strain-induced martensite trasformation, cold-working could properly simulate the change in cyclic hardening/softening behavior of TP304 stainless steel base and weld metals due to neutron irradiation. It was also recognized that cold-working could adequately simulate the reduction in failure cycles of TP304 stainless steel base and weld metals due to neutron irradition in the low-cycle fatigue region.