Fuel properties estimating apparatus for an internal combustion engine includes a controller to determine an estimated component concentration of a component in a fuel. The present invention provides a laser irradiation apparatus that can suppress the aberration due to the imaging optical system typified by a cylindrical lens, that can enlarge the square measure of the beam spot in which the intensity distribution is homogenous, and that can anneal the irradiated surface homogeneously efficiently. The method includes: obtaining information from first devices currently connected to the first network, the information including device information; obtaining information from second devices via the interface device, about the services of second devices connected to the second network; generating a user interface description in one or more of the first devices based on the obtained information. Failures in the primary controller memory or execution will activate the safety core pacemaker. Other embodiments are disclosed. The controller is configured to receive signals from the first and second flow sensors and to produce control signals for the first and second pumps and the mixer.