Abstract: A device and method for testing a patient's sensitivity to a plurality of potential allergens is disclosed using the galvanometric skin response of the patient's body to determine the same. A pair of electrodes are attached at separate locations of the body and are connected to a signal amplification unit and A/D converter, which is in turn connected to the bus of a personal computer. An allergen sampling tray is also connected to the computer bus and also a third electrode adapted to deliver the allergen samples in sequence transcutaneously. The skin response changes according to severity of the allergen reaction, and the signal amplification means and A/D converter allow these changes to be viewed graphically in a real time mode on the computer screen and also to be stored within the computer and to be printed out to allow the physician and the patient a hard copy of the test data.

Abstract: A central control system includes a method for monitoring a plurality of trains throughout a transit system having computer for maintaining a train location table tracking the location of the trains throughout the system and for detecting and recording false train occupancy indications. The system is designed to handle a large number of false occupancy designations and to associate each train with a physical track circuit location.

Abstract: A microprocessor controlled automatic door opener including means for detecting the velocity and direction of travel of the door. The microcontroller evaluates detected changes in either the velocity or direction of travel to determine the cause, and either reverses door travel direction or ignores the detection.