There is provided an apparatus for a reduced mass balancer shaft that effectively balance first or second order imbalances in an internal combustion engine. Said generator comprises a waste heat boiler to which exhaust gas of a gas turbine can be supplied. The time invariant set is stored in persistent storage. This histogram serves mainly for modeling the signal distortions. Based on stored setting information, the controller 360 converts the control content received from the main unit into the control content suitable for the access method specific to the memories 321 to 324, and performs readwrite refresh. The system comprises an email server configured to receive email messages addressed to an email address allocated for a user.