A hydraulic damping device has a cylinder, a rod, a piston, a first biasing member, a seal and a second biasing member. The modifying component is thereby introduced onto andor into the catalyst support to form a protected modified catalyst support which is less soluble in the aqueous acid andor the neutral aqueous solution. The change process changes at least one of a value of a write start voltage and an increase amount in a write voltage in a second write process. In another aspect, multiple eNBs may coordinate transmission of DL resources to minimize collisions of control signaling resources.