CS231n comnet 컴퓨터네트워크 BOJ 백준 udp c++ cnn Generative Hints KnowledgeDistillation Food-detection dh key exchange network security 25206 CutMix yolov5 LSTM R-CNN 계층화 loss function 2108 activation function Object Detection rnn circuit switching ResNet image classification backpropagation socket programming checksum video streaming GBN multiplexing Packet Switching TLS Transport layer KD SR localization tcp RSA DNS p2p http OTT Optimization Email