Provided is an epitaxial substrate for a semiconductor device, which has excellent schottky contact characteristics that are stable over time. The pallet content identification mechanism reads RFID tags on the pallet using an RFID portal scanner, converts the RFID information into corresponding barcode information, and displays the corresponding barcodes on a small display. The computer-assisted diagnostic hearing test further includes a speech reception threshold module configured to facilitate manual testing of a speech reception threshold test, and a speech discrimination module configured to facilitate manual testing of a speech discrimination test. Embodiments may further include computing an optimal resources configuration and computing at least one of an optimal completion time and an optimal cost corresponding to the optimal resources configuration.