Abstract: Hybrid ventilation apparatuses, systems and methods are provided. Some example mechanical ventilation apparatuses include a gas delivery system, at least one oxygen concentrator for generating oxygen enriched gas for delivery to a patient, at least one pressurized oxygen source for providing oxygen for delivery to the patient, and a controller. Based at least in part on an FIO2 setting for the gas to be delivered to the patient, the controller may determine an oxygen enriched gas flow rate of the oxygen enriched gas and a pressurized oxygen source flow rate of the oxygen from the at least one pressurized oxygen source, for the gas to be delivered to the patient. The controller may control the gas delivery system to deliver the gas to the patient in accordance with the FIO2 setting, the determined oxygen enriched gas flow rate, and the determined pressurized oxygen source flow rate.

Abstract: An amplifier system having an amplifier for amplifying a communications signal, a scanning receiver for monitoring a signal strength of the communications signal, a microprocessor for determining, based on the signal strength of the communications signal, whether the communications signal should be amplified, and a switch, controlled by the microprocessor, for allowing the communications signal to pass through the amplifier or be terminated.

Abstract: Wireless telephone networks, such as cellular, PCS networks, and other mobile radio services networks provide 911 or similar emergency calling services between mobile stations and a public safety answering point (PSAP). In emergency situations, the caller often will not be satisfied with the quality of the link to the PSAP, for any of a variety of subjective reasons. In such a case, the caller ends the first emergency call and initiates another emergency call. In accord with the invention, if the caller initiates the second emergency call within a predetermined interval from the first call, the mobile station will select an alternate operating system of the network for the second call. For example, if the first call utilized the A-side cellular carrier, the handset will select a B-side or PCS carrier for the second call. The handset also may select a different technology, e.g. analog instead of the normally preferred digital, for the second emergency call.

Abstract: Testing a CDMA cellular communication system involves placing stationary load box test units about a selected cell and transmitting predetermined signals from the test units. The signals include voice signals or audio test sequences, such that the transmissions simulate traffic loading in the cell. The effective radiated power from the stationary test units is varied in a predetermined manner to simulate fading, multi-path, and motion. A mobile test unit traverses the cell along a predetermined path. The mobile test unit makes, a CDMA telephone call to at least one of the stationary test units during transit. The mobile test unit includes a data recorder, which records test data regarding the call(s), including a recording of the voice or specialized audio test sequences. One or more of the stationary test units that receives a call from the mobile unlit also records pertinent data regarding the test call.