http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
무인이동체 및 지상국 컴퓨터 간의 시간 정보 동기화를 위한 시스템 연구
이원석,이운상,송형규,Lee, Won-Seok,Lee, Woon-Sang,Song, Hyoung-Kyu 한국반도체디스플레이기술학회 2020 반도체디스플레이기술학회지 Vol.19 No.1
In this paper, system that includes multiple unmanned aerial vehicles (UAVs) are considered. The vehicles are equipped with a mission computer for a specific mission and equipment. The mission equipment operates based on the time of mission computer. Also, data collected by flight computer and mission computer is saved with the time of each operating system. Generally, time offset between multiple computers always exists, though the computers are connected to the Internet. When the data collected by multiple computers is combined, the time offset causes damage on reliability of the combined data. Computers that connected to the Internet are synchronized by network time protocol (NTP). This paper proposes a system that the time of multiple mission computers are synchronized by the same NTP server to minimize the time offset. In the results of the measurement, the system time offset of multiple mission computer is maintained within 10ms from the system time of the server computer.
원위지골 내연골종에 이차적으로 발생한 심수지 굴곡건의 견열손상
문성훈(Sung Hoon Moon),홍철기(Chul Gie Hong),이운상(Woon Sang Lee),박진우(Jin Woo Park) 대한정형외과학회 2019 대한정형외과학회지 Vol.54 No.5
원위지골의 내연골종에 이차적으로 발생한 심수지 굴곡건의 견열 손상은 매우 드문 손상으로 아직 국내에 보고된 증례는 없다. 내연골종의 병적 골절에 대해서는 단순 소파술 후 주두돌기로부터 채취한 자가골을 이식하여 치료하였고, 견열 손상에 대해서는 끌어내기 봉합법을 통해 골편을 원위지골에 재부착하였다. 저자들은 이러한 치료를 통해 골 유합과 좋은 기능적 결과를 얻게 되어 이에 대해 보고하고자 한다. This case report describes the unusual occurrence of a flexor digitorum profundus avulsion secondary to an enchondroma of the distal phalanx of the middle finger. The enchondroma was treated by simple curettage with an autogenous bone graft harvested from the olecranon. The avulsed bone fragment was reattached to the distal phalanx using the pull-out suture technique. Bony union and full function of the digit were achieved.
하향링크 Massive MIMO 시스템에서 최적 오류 성능을 위한 GS 프리코딩의 반복횟수 도출 연구
노재현(Jae-Hyun Ro),이운상(Woon-Sang Lee),박찬엽(Chan-Yeob Park),김창환(Chang-Hwan Kim),송형규(Hyoung-Kyu Song) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
This paper proposes an estimation scheme of iteration number of Gauss-Seidel(GS) precoding in downlink massive multiple input multiple output(MIMO) system for optimal error performance. For estimating iteration number, the propose scheme calculates normalized Euclidean distance(NED) between the prior and updated GS precoding symbols using the property of decrease function of the GS precoding. The number of optimal iterations is estimated by comparing the NED with a threshold. The simulation results proves that an accuracy of estimation is very high when the number of transmit antennas is 2.5 times larger than the number of users, and the proposed scheme has optimal error performance.