Abstract: An object is to provide a wave power generator which can convert wave energy to electric energy with high efficiency and supply electric power of a large capacity at low cost and has a simple structure and is low in construction cost. The wave power generator includes a heavy body 3 elastically supported by air springs 4 as elastic members in an enclosing wall 2 on a floating body 1 and an electromagnetic damper as a generating means 7 provided between the heavy body 3 and the floating body 1. The spring constant of the air springs 4 is adjustable by providing auxiliary tanks in the piston 6 and the floating body 1 so that the undamped natural frequency of the air spring is equal to or close to the frequency of waves within a predetermined frequency ratio ?/?0. Thus, the frequency of the spring system resonates with the frequency of waves, so that the relative movement of the power generating means 7 increases to a maximum and power generation is carried out with maximum efficiency.

Abstract: The present invention provides a video distribution system and a video distribution method that can update video data to be distributed after distributing a distribution list to a user terminal. A distribution list generating processing unit 22 generates a distribution list that includes the link name linked to the video data as a distribution request destination. The link list generating processing unit 23 generates a link list that is a correspondence list between the link name and the video data file name corresponding to the link name. The link list updating processing unit 24 updates the video data file name corresponding to the link name in the link list to another video data file name depending on the distribution conditions.