• 한국정보통신학회논문지
• /
• 제21권12호
• /
• pp.2394-2402
• /
• 2017

수심이 얕은 연안에서는 다중경로에 의한 주파수 선택적인 페이딩이 수중음향통신시스템의 성능을 결정한다. 본 연구에서는 수심 약 50m이고 유효파고 0.5m, 사니질 저질인 부산인근 해역의 수중음향통신 채널의 특성과 다중반송파 음향통신시스템의 성능을 평가하였다. 송수신기 수평거리에 따른 다중경로 지연 확산과 시간영역 및 주파수 영역 페이딩 특성을 제시하고 전송률 1kbps인 5ch-4FSK 시스템의 비트 오류율을 평가하였다. 시간영역 페이딩 오류를 제거하기 위해 리드 솔로몬 코드를 적용하였다. 다중경로는 4개 이하로 구성되며 송수신기 거리가 증가하면 시간 및 주파수 영역 페이딩은 작아지며 시스템의 비트 오류율은 감소하고 600m 이상의 거리에서 비트 오류율은 약 10-4 이었다.

• 한국환경과학회지
• /
• 제6권3호
• /
• pp.267-276
• /
• 1997

It has been studded that combustion and the production of air pollution of anthracite - bituminous coal blend In a fluidized bed coal combustor, The objects of thIns study were to investigate mixing characteristics of the particles as well as the combustibility of the low grade domestic anthracite coal and Imported h19h calorific bltununous coal in the fluidized bed coal combustor. They were used as coal samples ; the domestic low grade anthracite coal with heating value of 2,010kca1/kg and the Imported high grade bituminous coal with beating value of 6,520kca1/kg. Also, the effects of air flow rate and anthracite fraction on the reaching time of steady state condition have been studied. The experimental results are presented as follows. The time of reaching to steady state was affected by the temperature variation. The steady state time was about 120 minute at 300sc1h which was the fastest. It has been found that $O^2$ and $CO^2$ concentration were reached steady state at about 100 minute. It has been found that $O^2$ concentration decreased and $CO^2$ concentration increased as the height of fluidlzed bed Increased. It was found that splash zone was mainly located from 25cm to 35cm above distributor. Also, as anthracite traction Increased, the mass of elutrlatlon particles Increased, and $CO^2$ concentration decreased. As gk flow rate Increased,$O^2$ concentration decreased and $CO^2$ concentration increased. Regardless of anthracite fraction and flow rate, the uncombustible weight percentage according to average diameter of elutriation particles were approldmately high In the case of One Particles. As anthracite traction and k now rate Increased, elutriation ratio Increased. As anthracite fraction was increased, exit combustible content over feeding combustible content was Increased. Regardless of anthracite fraction, size distribution of Ued material from discharge was almost constant. Over bed temperature 85$0^{\circ}C$ and excess air 20% , the difference of combution efficiencies were little. It is estimate that the combustion condition In anthracite-bituminous coal blend combustion is suitable at the velocity 0.3m/s, bed temperature 85$0^{\circ}C$, the excess air 20%.