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STBC와 ARQ를 이용한 1-2-1 부호화 협력 통신
홍성욱(Seong-Wook Hong),공형윤(Hyung-Yun Kong) 한국전자파학회 2009 한국전자파학회논문지 Vol.20 No.5
본 논문에서 무선 센서 네트워크에 적용 가능한 시공간 블록 부호(Space-Time Block Coding: STBC)와 ARQ를 이용한 1-2-1 부호화 협력 통신 방식을 제안한다. 부호화 협력 통신은 협력 통신에 채널 부호화를 접목시킨 기술로 본 논문에서는 콘볼루션 부호화기를 사용한다. ARQ 방식은 소스 노드로부터 수신한 신호를 우선적으로 목적지 노드에서 평가하여 만족되어질 경우, ACK 메시지를 소스 노드와 릴레이 노드로 전송하고 수신한 신호를 복구하므로 기존의 협력 통신에 비해 주파수 효율을 높일 수 있다. 중계 노드 1과 2는 소스로부터 수신한 신호를 펑처링하여 목적지로 전송하는데, 이때 STBC 기술을 적용하여 프로토콜의 신뢰성을 높인다. 또한, 간단한 비교기를 통하여 우수한 BER 성능을 얻을 수 있다. 마지막으로 제안한 프로토콜을 레일리 페이딩과 AWGN를 고려한 Monte-Carlo 시뮬레이션을 통해 BER 성능을 검증하였다. This paper has proposed 1-2-1 coded cooperative communication that is a combination of STBC and ARQ. Coded cooperative communication is a protocol that integrates channel coding with cooperative communication. In this paper consider convolution encoder. ARQ method can increase the spectral efficiency than conventional cooperative communication because if the received signal from source node is satisfied by the destination preferentially, the destination transmits ACK message to both relay node and source node and then recovers the received signal. Where each relay 1, 2 forwards a punctured portion of receive data. When relay transmit to destination apply STBC the reliability to increase. Moreover this protocol can get better BER performance of receiver using simple comparator. We verified BER performance for the proposed protocol through Monte-Carlo simulation over Rayleigh fading plus AWGN.
국내 건설기업의 리스크 관리의 실태분석 및 개선방향에 관한 연구
홍성욱(Hong Seong-Wook),김형일(Kim Hyeung-Il),안용선(Ahn Yong-Sun) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.5
Even though the construction industry is an unstable field comparing with other industries, recognition and enforcement on this industry are not prepared well. Considering the specialty of construction and change of construction plan and social conditions, the study on risk management will be preceded to develop the construction industry in the future. In the real circumstances, the recognition of necessity and application are neglected in the domestic practical business aspect. For the investigation on cognitive standard of risk in the workers of the construction companies, surveys and visit consultation were executed to analyze risk management situation and the counter plan was found out to be helpful in proceeding of stable construction projects of companies. And I draw 5 items conclusion on an improvement plans of risk management in domestic construction.
건설폐기물로 배출되는 폐 콘크리트 재활용의 실태분석 및 효율화 방안에 관한 연구
홍성욱(Hong Seong-Wook),박신(Park Shin),안용선(Ahn Yong-Sun) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.2
Recently, construction earth, waste of concrete, asphalt and wood are getting increased due to demolishing aged apartments and expanding social facilities in not only capital city but local areas. In this country, disposal of the waste concrete has been highly relied on just burying into the ground, whilst it is reported that the waste has been illegally dealt with by some related companies, due to the problems such as high deportation and disposal cost and deficiency of the filled-in ground for the waste concrete. As a result, many of construction waste seem to be getting increased in the near future because of the time for reconstructing the buildings made in 60's and 70's. In this research, we try to figure out actual condition on recycling wastes of concrete which may create many demand and high value through the inquiry of question and interview. Based on problems in recycling construction waste, we suggest the efficient way of recycling waste concrete produced from reconstruction.