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여러길 환경에 알맞은 평균 조종 벡터를 바탕으로 한 적응 빔 만들기
김석찬,윤석호,송익호,박소령,이주식,Kim, Suk-Chan,Yoon, Seok-Ho,Song, Iick-Ho,Park, So-Ryoung,Lee, Joo-Shik 대한전자공학회 2000 電子工學會論文誌-SP (Signal processing) Vol.37 No.1
기지국에서 안테나 배열을 쓰면 간섭효과가 줄어들어 공간적으로 선택적인 정보를 보내고 받을 수 있다 이 논문에서는 이동국 근처에서 국소적으로 산란된 신화의 새로운 모형을 제시하고, 이 모형에서 빔형성기의 가중값을 얻는다. 모의실험결과는 제안한 방법의 성능이 매우 뛰어나고, 따라서 각 퍼짐이 넓고 여러길 전파가 심한 도시 환경에 제안한 방법이 알맞음을 보여준다. Antenna arrays at base-stations can be used to transmit and receive information selectively in space by reducing the interference effects. In this paper, a new model of locally scattered signals in the vicinity of mobiles is proposed, and under this model the weights of the beamformer are obtained. Computer simulation results demonstrate that the proposed scheme shows an excellent performance and works well even in the urban environment where there exist many multipath propagations with wide angular spread.
A finite element method dealing the singular points with a cut-off function
김석찬,공수련 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.21 No.1-2
We consider an elliptic partial differential equation with input function in H−1. We assume that the type of singular part of solution is known and the solution is expressed as a sum of regular and singular term. We use a cut-off function to isolate the singular part and pose a variational problem to find the regular part of the solution. Then we have the solution by adding the regular solution and singular part. Error analysis and some example with computation will be given.
CLASSIFICATION OF SINGULAR SOLUTIONS FOR THE POISSON PROBLEM WITH VARIOUS BOUNDARY CONDITIONS
김석찬,우경수,공수련 호남수학회 2009 호남수학학술지 Vol.31 No.4
The precise form of singular functions, singular function representation and the extraction form for the stress intensity factor play an important role in the singular function methods to deal with the domain singularities for the Poisson problems with most common boundary conditions, e.q. Dirichlet or Mixed boundary condition [2, 4]. In this paper we give an elementary step to get the singular functions of the solution for Poisson problem with Neumann boundary condition or Robin boundary condition. We also give singular function representation and the extraction form for the stress intensity with a result showing the number of singular functions depending on the boundary conditions.