The present invention provides a cement admixture that comprises at least one of a carboxylic acid based copolymer comprising a reactive surfactant as a monomer or a copolymer salt obtained by neutralizing the copolymer with an alkaline substance, a method for preparing the same, and a cement composition comprising the same. A policy data store contains security mode configuration data related to the computing devices. The gain-determination circuit generates a gain adjustment based on the sum of the first and second samples, the gain adjustment causing the amplifier to change the amplitude of the amplified information signal to or toward a predetermined amplitude.