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This paper studies a receive directional beam control method in vehicle-to-everything (V2X) wireless communication system. First, we reveal that for a given receive beam, the channel coherence time of fast varying vehicle channels decreases as time goes by. Then, we propose a novel adaptive receive beam control method termed dynamic beam management (DBM), tailored to this channel characteristic, which adaptively selects one of two predefined actions, i.e., channel estimation and beam alignment. The channel estimation is a process of reacquiring channel state information using known pilot signals for coherent detection toward a given receive beam direction. The beam alignment is a kind of analog beam selection method, which steers the direction of the receive beam to attain higher communication performance. Since the beam alignment must search through large dimension, it costs more time …