Abstract: An information processing apparatus that acquires familiarity information between a first person and a second person at each of a plurality of points in time in a temporal sequence, and determines a distance between a first node representing the first person and a second node representing the second person at each of the plurality of points in time in a temporal sequence based on a relationship of the familiarity information between the second person and the first person at neighboring points in time in the temporal sequence.

Abstract: An information processing apparatus that obtains intimacy degree information corresponding to identification information of a first person, specifies an extraction period based on the intimacy degree information, and extracts content in the extraction period.

Abstract: An electron beam generator for multiple columns includes: a plurality of cathodes, to which a single acceleration voltage supply applies a negative acceleration voltage, and which thus generates thermoelectrons; a grid for each of the plurality of cathodes, the grid converging the thermoelectrons emitted to form a beam of electrons; a grid voltage supply for giving the grid a potential which is negative relative to a potential of the cathode; and a control circuit for each cathode, for controlling the potential of the grid. The control circuit includes a current direction restricting element connected between a positive electrode of the grid voltage supply and the cathode, and a grid current supplied from the grid voltage supply is caused to flow to the cathode through the current direction restricting element.

Abstract: An electron beam generator for multiple columns includes: a plurality of cathodes, to which a single acceleration voltage supply applies a negative acceleration voltage, and which thus generates thermoelectrons; a grid for each of the plurality of cathodes, the grid converging the thermoelectrons emitted to form a beam of electrons; a grid voltage supply for giving the grid a potential which is negative relative to a potential of the cathode; and a control circuit for each cathode for controlling the potential of the grid. The control circuit includes a current direction restricting element connected between a positive electrode of the grid voltage supply and the cathode, and a grid current supplied from the grid voltage supply is caused to flow to the cathode through the current direction restricting element.