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이용태(Y.T. Lee),남현욱(H.W. Nam),송정일(J.I. Song) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Residual strength of fiber metal laminates after impact was studied. 3/4 lay up FML was fabricated by<br/> using 4 ply prepreg, 2 ply aluminum sheets, and 1 ply steel sheet. Quasi isotropic ([0/45/90/-45]s) and<br/> orthotropic ([0/90/0/90]s) FRP were also fabricated to compare with FML. Impact test were conducted by<br/> using instrumented drop weight impact machine (Dynatup, Model 8250). Penetration load and absorbed<br/> energy of FML were excellent than those of FRPs. Tensile test were conducted to evaluate the residual<br/> strength after impact. Strength degradation of FML was smaller than that of FRP. This means that the damage<br/> tolerance of FML is excellent than that of FRP. Residual strength of each specimen was predicted by using<br/> Whitney and Nuismer Model. Average stress criterion and point stress criterion were used to calculate the<br/> characteristic length. The characteristic length is assumed as constant. The distribution of characteristic length<br/> shows that the assumption is reasonable. Prediction was well matched with experiment.
박성익,이용태,김흥묵,음호민,서재현,김승원,Park, S.I.,Lee, Y.T.,Kim, H.M.,Eum, H.M.,Seo, J.H.,Kim, S.W. 한국전자통신연구원 2004 전자통신동향분석 Vol.19 No.4
본 고에서는 미국식(ATSC) 지상파 디지털 TV 방송을 단일 주파수 망(SFN)을 통해 서비스하기 위해 필요한 기술적인 사항에 대하여 고찰하고, ATSC 방송 방식에서 SFN을 구성하기 위한 방법을 제안한다. SFN구성은 방송 주파수의 이용 효율을 높이고, 방송 구역 내에서 안정적인 전파 세기를 보장한다. 이러한 SFN 구성을 위한 기술은 복수 개의 송신기를 이용하는 방법(DTX)과 복수 개의 디지털 동일 채널 중계기(DOCR)를 이용하는 방법으로 나뉘어진다. ATSC 방식에서는 두 가지 방법 모두 사용하여 SFN 구성이 가능하나, 복수 개의 송신기를 이용하는 방법은 현재의 기술 기준을 변경해야 한다는 제약이 따른다. 반면 다수 개의 DOCR를 이용하는 방법은 기존의 송신기와 함께 SFN 구성이 가능하여 망 구성이 용이하다.
조경섭,김건,이용태,류원,Cho, K.S.,Kim, G.,Lee, Y.T.,Ryu, W. 한국전자통신연구원 2014 전자통신동향분석 Vol.29 No.3
최근 세계적으로 지구온난화로 인한 이상기후로 수해나 지진 등의 자연재난이 증가하고 그 피해도 대형화되며 종류도 다양화 되는 추세로, 선진 각국은 국민의 생명과 재산을 보호하기 위해 다양한 매체를 활용하여 신속한 재난예보와 경보 전달을 위해 노력하고 있다. 본고에서는 국내외 재난경보 방송동향과 국외 통합경보시스템에 대해 소개하고, 지능 맞춤형 통합경보시스템의 필요성과 연구개발 사례와 연구개발 중인 지능 맞춤형 통합경보시스템을 살펴보고자 한다.
방준성,박원주,윤상연,신지호,이용태,Bang, J.S.,Park, W.J.,Yoon, S.Y.,Sin, J.H.,Lee, Y.T. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.1
As society develops, the demand for safety and security services increases. Developed nations such as the United States use advanced technology to lower crime rate and promote intelligent security services. First, this article examines intelligent systems that are used for monitoring and detecting crimes and dangerous situations. Recently, we have been studying technologies that enable preemptive responses through prediction of crime and hazardous situations. In this paper, we examine the cases of security services based on a crime/risk prediction model and explain the structure and major technologies of an intelligent security system. In addition, we propose a direction for technological development for achieving future security services.
박영수,김승희,박원주,백명선,이용태,Park, Y.S.,Kim, S.H.,Park, W.J.,Baek, M.S.,Lee, Y.T. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.5
Based on data provided by the science and technology knowledge infrastructure (ScienceON, 2017-2021), this paper reviews the research trends of domestic police services and related technologies, and describes the research and development direction of policing technology. For this purpose, the research was searched using the keywords science policing, smart policing, predictive policing, and policing. Policing technology is used for crime investigation (prevention), such as crime analysis and crime prediction. The collection of related data use urban infrastructure, the processing of data collected using technologies, such as artificial intelligence, and the utilization of data in police services (system) were summarized. In future, on-site support technology and crime investigation (prevention) technology for a preemptive correspondence to social threats and effective police activities must be developed. In addition, the quality of police services should be improved, a system to use police-related data should be developed, and the capabilities of police experts need to be strengthened.