A melt assembly that includes a drip plate; and a self regulating heating device thermally connected to the drip plate, wherein the heating device is a positive temperature coefficient material. Selected inorganic or polymeric materials are applied on the insulating material surface, and stable superhydrophobic coatings can be fabricated. If desired, the prosthesis replacement may also replace the natural pedicles. A matched filter filters the spread-spectrum signal with a common filter having characteristics matched to the synthesis filter bank in the transmitter by filtering each frequency to generate a sequence of narrow pulses. A route topology data structure is formed using the plurality of movement paths and the durations of the plurality of movement paths, the data structure comprising for a plurality of cells an estimated time to reach an elevator location.