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황영우(Young woo Hwang),한광훈(Kwanghun Han),이해원(Hyewon Lee),김영수(Youngsoo Kim),최성현(Sunghyun Choi),장경훈(Kyunghun Jang) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Recently, Cognitive Radio (CR) techniques for effective usage of limited spectrum band have been researched. In this paper, we introduce two criterions, namely primary-user awareness and coordination, and hence classify CR into four categories based on their combinations. For each category, we describe the functionalities which should be supported by the network, and discuss the advantage/disadvantage expected in a sample scenario.