| http://www.w3.org/ns/prov#value | - In order to determine a movement direction of the actuator resulting in an improvement of the red reflex, the controller may start to actuate the actuator 83 at first in one arbitrary direction, and determine whether the result is improving, i.e. whether, for example, a ratio I(red) over I(blue) increases relative to a ratio I(red) over I(green).
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