The era of digital avionics is opening a fabulous opportunity to improve aircraft operational functions, airline dispatch and service continuity. But arising vulnerabilities could be an open door to malicious attacks. Necessity for security protection on airborne systems has been officially recognized and new standards are actually under construction. In order to provide development assurance a...

The Dynamic Trust-based Resources (DyTR) system applies a dynamic notion of trust to ad hoc network resources. DyTR continuously assesses the trustworthiness of entities over time based on system events and controls network resources according to current levels of trust. For dynamic trust assessment, DyTR utilizes a socio-cognitive model of trust, a formal model of the essential concepts and ch...

pushover analysis is a simplified nonlinear analysis technique that can be used to estimate the dynamic demands imposed on a structure under earthquake excitations. one of the first steps taken in this approximate solution is to assess the maximum roof displacement, known as target displacement, using the base shear versus roof displacement diagram. that could be done by the so-called dynamic p...

A spark gap at pressures from 100 kPa to 7 MPa with various gases is fired by overvolting the electodes. The recovery of the gap is studied using a second identical pulse to test the voltage holdoff during the recovery period. A TV camera, interferometer and a spinning mirror camera are also used to record arc locations and density profiles. The gas is stationary during the recovery. Breakdown ...

An extension of the coupled criterion (CC) finite fracture mechanics is established in order to assess dynamic crack initiation. The main change compared classical quasi-static approach consists considering velocity profile during initiation instead assuming an instantaneous proposed enables study under either or loading. It illustrated on several examples including transverse cracking laminate...