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남부희(Boo Hee Nam),강성귀(Sung-Gui Kang),유태우(Tae-U Yu),방병렬(Byeong Ryeol Bang),지규인(Gyu-In Jee) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
We design a multi-element photo-detector to measure the size of particles using the diffracted light energy distribution. The scattered profile measured by the photodetector is sampled by a 32 channel analog-to-digital converter. A nonnegative least squares analysis translates the light energy distribution into the corresponding unique particle size distribution. The responses of the particle sizing system are studied theoretically and experimentally.
Transmission of Moving Image on the Internet Using Wavelet Transform and Neural Network
김정하,이학노,남부희,Kim, Jeong-Ha,Lee, Hak-No,Nam, Boo-Hee Institute of Control 2004 제어·로봇·시스템학회 논문지 Vol.10 No.11
In this Paper we discuss an algorithm for a real-time transmission of moving color image on the TCP/IP network using wavelet transform and neural network. The Image frames received from the camera are two-level wavelet-transformed in the server, and are transmitted to the client on the network. Then, the client performs the inverse wavelet-transform using only the received pieces of each image frame within the prescribed time limit to display the moving images. When the TCP/IP network is busy, only a fraction of each image frame will be delivered. When the line is free, the whole frame of each image will be transferred to the client. The receiver warns the sender of the condition of traffic congestion in the network by sending a special short frame for this specific purpose. The sender can respond to this information of warning by simply reducing the data rate which is adjusted with a neural network or fuzzy logic. In this way we can send a stream of moving images adaptively adjusting to the network traffic condition.