Award Data

OPERATION OF A JAMMER TRANSMITTER FROM A SMALL PLATFORM (RPV OR JEEP) NECESSITATES THE USE OF ELECTRICALLY SHORT ANTENNAS SUCH AS SHORT WHIPS AND SMALL LOOPS. THE CONVENTIONAL APPROACH USES A POWER AMPLIFIER DESIGNED FOR A 50-OHM LOAD AND AN ANTENNA TUNER THAT MATCHES THE ANTENNA-INPUT IMPEDANCE TO OHMS. HOWEVER, THE RAPID FREQUENCY CHANGES REQUIRED BY JAMMERS PRECLUDE THE USE OF ANTENNA TUNING. T ...

THE DEVELOPMENT OF SIMULATION MODELS OF A DISTRIBUTED SYSTEMS AND THEIR MAPPING INTO A PARALLEL SYSTEM, IS A HIGHLY COMPLEX TECHNICAL TASK BECAUSE OF THE GREAT INFLUENCE ITS VARIOUS ELEMENTS WILL HAVE ON ITS PERFORMANCE. THERE ARE MAJOR TECHNICAL ISSUES INVOLVED IN PERFORMING SUCH COMPLEX SIMULATION EFFORT, INCLUDING UNIQUE REQUIREMENTS SIMULATION MODELS, VARIED ARCHITECTURAL CONCEPTS OF DISTRIBUT ...

An intelligent nonlinear control methodology, based on an innovative combination of feedback linearization and artificial neural networks, is to be adapted to control remotely piloted helicopters. A mapping is derived which transforms a nonlinear dynamic model of the plant into a linear, time invariant space. A single point linear controller design is then carried out in this linear space. The der ...

We propose to develop compact, high-speed, highly-functional III-V semiconductor optoelectronic modules optimized for implementation into optical signal processing (OSP) systems under development at government and university laboratories. The modules will be based on vertical-cavity surface-emmitting lasers integrated discretely or monolithically with other optoelectronic or electronic circuitry. ...

THE PURPOSE OF THIS EFFORT IS TO STUDY THE FEASIBILITY OF AND, HOPEFULLY, VALIDATE THE USE OF TASK NETWORK MODELING TOSTUDY HUMAN FACTORS IN THE CONTROL ROOM. TASK NETWORK MODELING EXTENDS A HUMAN ENGINEERING TASK ANALYSIS INTO A COMPUTER MODEL. WE PROPOSE THAT PERTURBING THE INDIVIDUAL TASKS IN A TASK NETWORK MODEL IN A MANNER PREDICTED FROM CONTROL ROOM DESIGN CHANGES, TASK AUTOMATION, OR THE CO ...

RESIDUAL LIFETIME EVALUATION OF EXISTING NUCLEAR FACILITIES REQUIRES DETAILED INFORMATION REGARDING CONDITION OF CONTAINMENT AND SUPPORT STRUCTURES. CURRENT NONDESTRUCTIVE METHODS FOR SUBSURFACE EVALUATION OF REINFORCED CONCRETE USE COMPLEX EQUIPMENT AND RELY HEAVILY ON INTERPRETATION BY THE OPERATOR. A RESEARCH EFFORT IS PROPOSED TO EXAMINE THE USE OF COMPUTERIZED TOMOGRAPHIC IMAGING FOR LOCATING ...

IMPLEMENTATION OF AN INTEGRATED DETECTION SYSTEM FOR CONTAMINATION MONITORING OF RESPIRATORS HAS BEEN PROBLEMATIC. BECAUSE OF THE COMPLEX SURFACES, HAND MONITORING USING PORTABLE SURVEY INSTRUMENTATION HAS BEEN THE PREFERRED METHOD. HAND MONITORING IS COSTLY IN TIME AND OFTEN FAILS TO RELIABLY ACHIEVE A GIVEN DETECTION LIMIT BECAUSE OF VARIABLES SUCH AS SURVEY SPEED ANDDISTANCE FROM THE PROBE. THE ...

SIGNIFICANT CONSERVATISM IN MODERN SEISMIC PRA DERIVES FROM SIMPLIFICATIONS IN GROUND-MOTION CHARACTERIZATION AT THE INTERFACE OF SEISMIC HAZARD AND FRAGILITY METHODOLOGIES. THIS CONSERVATISM ARISES BECAUSE A SINGLE COMPOSITE-MAGNITUDE, BROAD-BAND, GROUND-MOTION SPECTRUM IS USED TO DERIVE FRAGILITY FUNCTIONS, WHEREAS THE MAJORITY OF MOTIONS CONTRIBUTING TO SITE HAZARD HAVE (LESS-DAMAGING) NARROW-B ...

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