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Kim Jeongeun Kim Sukwha Kim Seongheui Lee Euehun Heo Yoonjeong Hwang Cheol-Yong Choi Yun-Young Kong Hyoun-Joong Ryu Hyeongju Lee Hyeongsuk 《Intelligent Service Robotics》2021,14(5):729-739
Intelligent Service Robotics - This study aims to analyze the concept of companion robots for older adults from the perspective of nursing. This study employed a concept analysis. The literature... 相似文献
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Heung-Gyoon Ryu Yun-Young Kim Hyeong-Man Yu 《Electronics letters》2001,37(8):482-484
A new design method for a triple-tunable type DDFS-driven PLL frequency synthesiser is presented. Since only a phase accumulator is used in the DDFS (direct digital frequency synthesiser), the other parts of the DDFS such as ROM and a D/A converter can be excluded using the proposed method. Therefore, performance improvements are achieved such as circuit simplicity, reduced power consumption and switching time. In addition, the output of the designed DDFS is processed to provide a jitter-free input reference to the PLL. Simulation results show the validity and performance improvements of the proposed system, compared with the conventional system 相似文献
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