Verification and validation of complex system simulations are generally considered to be independent concepts. We consider the system model verified if there is a proof of the properties in question. We demonstrate that validation is a contravariant form of verification. We do this by considering the refutation tree produced by a resolution proof of the system properties. We indicate areas requ...

In this technical report, the proof of equivalence of a program with the code generated from it using symbolic execution based data flow analysis is presented. 1. Definitions Control Flow Graph (CFG): A directed graph whose nodes are primitive statements such as arithmetic, load, store, two-way branch, and two-way join. Its edges represent transitions from a statement to another statement as a ...

This paper describes the development on RASSP Benchmark 1 and 2 of the synthetic aperture radar (SAR) image processor using the RASSP design environment. The overall process flow developed by Lockheed Martin’s Advanced Technology Laboratories, as applied on the SAR processor, is illustrated. Results from using executable specifications; parametric cost estimating tools and VHDL-based performanc...

Humanitarian demining still is a highly labor-intensive and high-risk operation. Advanced sensors and mechanical aids can significantly reduce the demining time. In this context, it is the aim to develop a humanitarian demining mobile robot which is able to scan a minefield semi-automatically. This paper discusses the development of a control scheme for such a semi-autonomous mobile robot for h...

The project envisions a real-time video transmission between two points using GNU Radio and Universal Software Radio Peripheral (USRP). In our project, a video signal which could be a realtime signal from a camera or simply a video file is modulated and processed by GNU radio and transmitted using a USRP. There is a USRP receiver node which receives the signal and GNU radio demodulates and re-p...

The ESA Earth Observation TerraSAR-L system features a L-band Synthetic Aperture Radar and strives for very high radiometric performance for spatial resolutions of 5 meters and swaths up to 200 km, in strip-map and ScanSAR operations, full-polarimetric capabilities, repeat-pass ScanSAR interferometry and a Wave Mode. Such levels of radiometric performance require the use of instrument calibrati...

Clusters of CdS in the quantum confinement regime C5O-A diameter are prepared in a rational technique whereby the cluster size and its distribution are controlled by chemical means. Competitive reaction chemistry between CdS core cluster growth and surface capping by thiophenolate leads to clusters whose core is essentially sphalerite CdS but whose reactive surface has been passivated by covale...

Interconnect (CI) bus. All Digital's decision stations were to be dual to implement the fiber attachment stations (DASs) distributed data interface and the interconnections (FDDI) physical topology between the stations were with a dual ring of to be wired directly, trees, as opposed to a without patch panels or dual ring only, resulted similar structured wiring in the development of schemes. th...

execution proceeds. We write (M, I) −→T (M̂, Î) to mean that executing instruction I in machine state M results in machine state M̂ with Î poised to execute next in thread T . We write (M, I) −→T (M̂, Î) to indicate several steps of execution (transitive closure of above). Fence instructions behave as no-ops: (M, HFENCE) −→T (M, I), where I is the next instruction in program order in T and similar...

In the last 12 months 10Gb/s serial data transmission in copper backplane has moved from being a good possibility to a practical reality. Advancements both in active signal conditioning and passive interconnect technologies have made this happen. Today it is feasible to build, in volume production, a long reach multiple channel copper backplane that can deliver an aggregate bandwidth of hundred...