To date, computers have altered the way in which information is accessed and made available. The links between person and person, and organization have been radically changed. One possible outcome is that the Computer Revolution might effectively reverse the pull to the towns of the earlier evolution. This paper outlines the contribution of LEO in the development of computers.
The basic ideas of quantum computation are introduced by a brief discussion of Bennett and Fredkin's ideas of reversible computation. After some remarks about Deutsch's pioneering work on quantum complexity and Shor's factorisation algorithm, quantum logic gates, qubits and registers are discussed. The role of quantum entanglement is stressed and Grover's quantum search algorithm described in detail. The paper ends with a review of the current experimental status of quantum computers.
The Controller Area Network is a well-established networking system specifically designed with real-time requirements in mind. Developed in the 1980s by Robert Bosch, its ease of use and low cost has led to its wide adoption throughout the automotive and automation industries. However, for the beginner using CAN may seem somewhat bewildering. This article goes some way into explaining how CAN is used both at the hardware and the software levels.
Automotive electronic systems are piggybacking on the exponential growth of the computer industry. This article takes a look at the progressive innovations which have shaped the electrical architecture of today's vehicles and which will mould tomorrow's. It discusses: why networks are necessary in vehicles; special attributes of these networks; examples of automotive control network protocols; importance of software in modern vehicles; and future automotive system trends.
Currently it is estimated that more than 80% of all innovations within vehicles are derived from electronic systems! The cost of electronics in executive vehicles can amount to over 23% of the vehicle production cost. One wireless technology that may help to re-write the affordability equation for advanced electronic systems is known as Bluetooth. This article discusses the potential of Bluetooth within the automotive industry.
The constructive design of dependable distributed real-time systems out of prevalidated components requires precise interface specifications of the components in the temporal domain and in the value domain. This paper focuses on the temporal specification of interfaces in composable distributed real-time systems and establishes four principles of composability, It presents the temporal firewall interface that forms a fully specified operational interface of a component. The paper explains how the temporal firewall interface supports the four principles of composability. It then classifies interfaces from the point of view of composability and shows how these interfaces correspond to the time-triggered and event-triggered communication paradigms.
Predicting the reliability of military vehicles has traditionally concentrated on estimation using failure data gathered during trials or use. However, it is increasingly recognised that predicting reliability earlier in the life cycle, using design and process capability evidence, is one way of improving predictions and positively influencing reliability. This article presents the use of Bayesian belief networks (BBNs) as a decision support tool to achieve these twin goals. The BBN models presented are built into the TRACS software tool, which is in daily use within DERA Land Systems.