The invention refers to a rack module comprising a first plate on one side of the module and a second plate on the other side of the module. In the apparatus and method, a clock generator outputs the clock signal at every period, a PDR is included with each stage for outputting information about a processing speed of each stage, and a CCU controls the delay of the clock signal using the processing time of each stage received from the PDR and providing the clock signal with the controlled delay to a register between stages. The invention is useful for putty or film coatings prepared with this dispersion. The passageway is also curved along its length, with the open ends thereof being slightly lower than the center thereof. The authorization system can also traverse containment relationship types to grant objects permissions contained by other objects. The optical mixer is configured for deriving a plurality of polarization diverse signals from the input signal, each polarization diverse signal having a different state of polarization, and deriving a set of balanced quadrature signals for each polarization diverse signal by combining each polarization diverse signal with a signal derived from the local oscillator signal.