Abstract: A tailgate opening and closing system, which includes a control device for controlling an opening and closing device that opens and closes tailgate placed in a rear side portion of a vehicle, and includes a measurement device that is placed in the rear side portion and obtains distance data to an object present behind the rear side portion, in which the control device executes, based on a plurality of the distance data which have been obtained by the measurement device, data processing of identifying an entry motion of the object to a trigger region set in a region apart from the rear side portion within a measurement range of the measurement device and an exit motion of the object from the trigger region, and the control device executes control processing of opening and closing the tailgate based on a combination of the identified entry motion and the exit motion.

Abstract: A method for producing a ceramic circuit board including a ceramic substrate and a metal layer formed on the ceramic substrate, includes a step of forming the metal layer on the ceramic substrate by spraying a metal powder after accelerating the metal powder to a velocity of from 250 to 1050 m/s as well as heating the metal powder to from 10° C. to 270° C. and a step of subjecting the ceramic substrate and the metal layer to a heat treatment in an inert gas atmosphere.