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Piezoresponse Force Microscopy를 이용한 Pb(Zr,Ti)O<sub>3</sub> 세라믹의 단계적 Poling에 의한 강유전체 도메인 진화 과정 관찰
김관래,Kim, Kwanlae 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.1
Ferroelectric material properties are strongly governed by domain structures and their evolution processes, but the evolution processes of complex domain patterns during a macroscopic electrical poling process are still elusive. In the present work, domain-evolution processes in a PZT ceramic near the morphotropic phase-boundary composition were studied during a step-wise electrical poling using piezoresponse force microscopy (PFM). Electron backscatter diffraction was used with the PFM data to identify the grain boundaries in the region of interest. In response to an externally the applied electric field, growth and retreat of non-$180^{\circ}$ domain boundaries wasere observed. The results indicate that ferroelectric polarization-switching nucleates and evolves in concordance with the pattern of the pre-existing domains.
TV Anytime 및 MPEG-21 DIA 기반 콘텐츠 이동성을 이용한 디지털 홈 환경에서의 유비쿼터스 TV 콘텐츠 소비
김문조(Munjo Kim),양찬석(Chanseok Yang),임정연(Jeongyeon Lim),김문철(Munchurl Kim),박성진(Sungjin Park),김관래(Kwanlae Kim),오윤제(Yunje Oh) 한국방송·미디어공학회 2005 방송공학회논문지 Vol.10 No.4
Much research in core technologies has been done to make it possible the ubiquitous video services over various kinds of user information terminals anytime anywhere in the way the users want to consume. In this paper, we design prototypesystem architecture for the ubiquitous TV program content consumption based on user preference via various kinds of intelligent information terminals in digital home environment, and present an implementation and testing resultsfor the prototype system. For the system design, we utilize the TV Anytime specification for the consumption of TV program contents based on user preference in TV programs, and also use the MPEG-21 DIA (Digital Item Adaptation) tools which are the representation schema formats in order to describe the context information for user environments, user terminal characteristics, user characteristics for universal access and consumption of the preferred TV program contents. The proposed ubiquitous content mobility prototype system is designed to make it possible to seamlessly consume contents by a single user or multiple users via various kinds of user terminals for the TV program contents they watch together. The proposed ubiquitous content mobility prototype system in digital home environment consists of a home server, a display TV terminal, and an intelligent information terminal. We use 42 TV programs contents in eight different genres from four different TV channels in order to test our prototype system.