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이기종 디바이스를 이용한 인터렉티브 디지털 사이니지 시스템 연구
박대승,성열우,김정길,Park, Dae Seung,Sung, Yeol Woo,Kim, Cheong Ghil 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.3
In general, digital signage is a next-generation smart media that provides various information and advertisement services to many people indoors or outdoors using the Internet. Recently, digital signage is rapidly spreading in such a small indoor environment, that is, in an area closely related to daily life, for example, inside an elevator. However, in this kind of indoor environment where the stay time of persons is extremely limited, it would be not easy for them to keep advertisements in the user memory for a long time. In the digital signage display installed in an indoor environment, it is possible to think about the possibility for a function such as expanding the screen to a user's smartphone, which is now widely spread, to contain, store, and use the transmitted content. In this paper, we propose a method to extend the display of digital signage contents to personal smart phones with interaction function in such a limited environment. In order to make the system operation, the proposed system was verified by confirming the result of dual screen implementation in a smart phone through the prototype implementation of a digital signage system in an embedded Linux environment.
Transverse Vibration Analysis of Onboard 12-Cylinder Diesel Engine
Kim,Moon-Soo,Kim,Sa-Soo,Cho,Dae-Seung,Park,Jin-Hwa 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-
6기통 이상의 장행정·저속 선박용 디젤엔진은 엔진 본체와 이를 지지하는 선체구조가 엔진의 횡방향 기진력인 guide force moment에 의해 H- 또는 X-모드 형태의 진동문제가 유발될 가능성이 높으므로 엔진과 선체의 연성진동 특성을 사전에 예측할 필요가 있다. 본 논문에서는 대형 선박에 탑재된 엔진 구조의 횡방향 진동특성 및 선체구조와의 연성효과를 파악하기 위하여 선체 모델링을 달리 한 4개의 3차원 유한요소모델을 이용하여 5,000TEU급 콘테이너 운반선에 탑재된 74,500마력의 12K90MC-C 엔진에 대한 진동해석을 수행하였다. 아울러, 엔진 상부와 선체를 연결하는 지지대의 설치에 따른 엔진 본체의 진동특성변화 효과를 수치해석적 방법으로 평가하였다. 상기의 해석 결과는 실선 시운전시의 계측결과와 비교·검토하였다. Long stroke and low speed diesel engines having six or more cylinders are believed to undergo H- and X-mode vibration problems related to resonant response of the engine and its foundations due to guide force moments. But, it is still difficult to predict vibration characteristics of onboard engine frame precisely. In this paper, vibration analysis using the 3-dimensional finite element models for the 12K90MC-C engine built in the 5,000 TEU class container carrier has been performed in order to find out the dynamic characteristics of the onboard engine frame and their coupled effect with ship structures, especially in transverse mode. The natural frequency variation of the diesel engine frame due to the fitting of frictional or hydraulic stays were also investigated. The results are compared with the measured during the sea trials.