A vertical position of a ram is directly detected by a ram position detector. First and second types of time slots selected from receiving and transmitting type time slots are allocated as the first and second time slots, respectively, in a current frame. , and useable products, such as distillate, coke, and oilare recovered. A list associated with the subset of data objects may then be created, wherein the list is at least partially ordered based on a degree of relevance between a data object in the list and the event.