A fault-tolerant multiprocessor architecture for aircraft, volume 1

A fault-tolerant multiprocessor architecture is reported. This architecture, together with a comprehensive information system architecture, has important potential for future aircraft applications. A preliminary definition and assessment of a suitable multiprocessor architecture for such applications is developed

Studies of inspection algorithms and associated microprogrammable hardware implementations

This work is concerned with the design and development of real-time algorithms for industrial inspection applications. Rather than implement algorithms in dedicated hardware, microprogrammable machines were considered essential in order to maintain flexibility. After a survey of image pattern recognition where algorithms applicable to real-time use are cited, this thesis presents industrial inspection algorithms that locate and scrutinise actual manufactured products. These are fast and robust - a necessary requirement in industrial environments. The National Physical Laboratory have developed a Linear Array Processor (LAP) specifically designed for industrial recognition work. As with most array processors, the LAP has a greater performance than conventional processors, yet is strictly limited to parallel algorithms for optimum performance. It was therefore necessary to incorporate sequentialism into the design of a multiprocessor system. A microcoded bit-slice Sequential Image Processor (SIP) has been designed and built at RHBNC in conjunction with the NPL. This was primarily intended as a post-processor for the LAP based on the VMEbus but in fact has proved its usefulness as a stand-alone processor. This is described along with an assembler written for SIP which translates assembly language mnemonics to microcode. This work, which includes a review of current architectures, leads to the specification of a hybrid (SIMD/NIMD) architecture consisting of multiple autonomous sequential processors. This involves an analysis of various configurations and entails an investigation of the source of bottlenecks within each design. Such systems require a significant amount of interprocessor communication: methods for achieving this are discussed, some of which have only become practical with the decrease incost of electronic components. This eventually leads to a system for which algorithm execution speed increases approximately linearly with the number of processors. The algorithms described in earlier chapters are examined on the system and the practicalities of such a design are analysed in detail. Overall, this thesis has arrived at designs of programmable real-time inspection systems, and has obtained guidelines which will help with the implementation of future inspection systems.<p

Designing a high level microprogramming language

The purpose of this research is to design a high level language (HLL) suitable for microprogramming. A top down design technique has been adopted which makes the language design process simple and accurate. The primitive operations of a high level language for producing emulators is shown to include special purpose features specific to virtual machine implementations. A hierarchy of data types, short reliable language constructs, and control structures that minimize emulator complexity are suggested by a goal-directed, structural design methodology. In addition, structural clues generated by the language compiler assist in producing portable yet efficient horizontal microcode for partially encoded host architectures. Furthermore, software tools in the form of a simulator-compiler combination are presented which provide features for design, development, test and eventual certification of microprograms

Techniques for the realization of ultra- reliable spaceborne computer Final report

Bibliography and new techniques for use of error correction and redundancy to improve reliability of spaceborne computer

Measurements, Models, Systems and Design

531 s.

Advanced data management system analysis techniques study

The state of the art of system analysis is reviewed, emphasizing data management. Analytic, hardware, and software techniques are described