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송종현,B.-G. Park,박재훈,정윤희 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
We grew double-perovskite Sr2FeMoO6 thin lms by using pulsed laser deposition (PLD) and systematically investigated the effects of the deposition temperature (TD) variation on their crystal structure, electronic valence state, electrical transport, and magnetic properties. The B-site double-perovskite Fe/Mo ion ordering and the saturated magnetization (Ms) were optimized at TD = 850 ℃ while their suppressions were observed at above 900 ℃. For the samples with TD ≥ 900 ℃, the grain structure should be included in considerations to understand the behavior of the resistivity. The valence states of the Fe and Mo ions also depended on TD; mixed (singly)-valence Fe states were exhibited for the B-site ordered (disordered) film. These observations indicate that the TD plays a crucial role in the growth of double-perovskite Sr2FeMoO6 thin films and determines their physical properties.
Expansion of ATSC 3.0-Based Disaster Broadcasting Service for the Visually and Hearing Impaired
송종현 한국멀티미디어학회 2022 The journal of multimedia information system Vol.9 No.3
Disasters are now becoming commonplace and especially the vulnerable group such as the disabled, the elderly, children and foreigners are in a state of overlapping disasters. In this situation, ATSC 3.0-based UHDTV disaster information service for the visually and hearing impaired has been developing. This study focuses on the demand data collected through in-depth interview with the impaired. The demand analysis data is very important to development process of technology. The results of the interview show that it is essential to link the UHDTV disaster signals with home-network, IoT, wearable devices, and various assistive devices for the impaired (hearing aid, smart light bulbs, warning light, etc.). In outdoor space, UHDTV disaster information must be connected to public display media, digital signage, kiosk, screens in bus or taxi. If communication aids for the visually and hearing impaired are equipped with a function that can transmit and receive disaster information, it will help to minimize disaster damage.