We present a method to construct real-time systems using as components anytime algorithms whose quality of results degrades gracefully as computation time decreases. Introducing computation time as a degree of freedom defines a scheduling problem involving the activation and interruption of the anytime components. This scheduling problem is especially complicated when trying to construct inter-...

A goal of the Iligl)t Sys(cm ‘[ ’cs(bd (1 ’S’1 ’ ) is 10 gcmrdlim and opt im im system-level spacecraft in[crfaccs in suppor( of mpid prototypit~g a n d intcgta[ion testins [ l;S’l’, [’194]. Using software 10 simulate the spacccrdft and environment al arbitrary levels of abstraction is lhc Illcmc oftbis paper. A snapshot of a spacccmfi under clcvclopmmt includes a combination o f barciwarc cagi...

Managing power consumption while simultaneously delivering acceptable levels of performance is becoming a critical issue in several application domains such as wireless computing. We integrate compiler-assisted techniques with poweraware operating system services and present scheduling techniques to reduce energy consumption of applications that have deadlines. We show by simulation that our dy...

Both visualization and simulation tasks make high demands on accuracy and interactivity. The former is an evident requisite of any tool focusing on quality, the latter stands for a responsive system in which the user has real-time control. A permanent trade-off between both demands can be observed, since high accuracy is usually time-consuming. The graphics processing unit (GPU), which evolved ...

Real-time database systems can have security constraints in addition to timing constraints. Such real-time systems are typically contained in environments that exhibit hierarchical propagation of information, where mandatory access control for security is required. Conventional multi-level secure database models that implement mandatory access control are inadequate for time-critical applicatio...

base class<>Towable TrolleyTrailerVehicle Implementing an interface 13.7 Interobject messaging UML represents the various different types of communication that can takeplace between objects with a single message generalization. So an abstractUML message could be implemented by a straightforward call to a method,a remote procedure call (rpc), a piped messag...

ion The hiding operator P n A makes the events in the set A internal to the process, thus removing them from the control of the environment. The only participants will then be the components of P. From the maximal progress assumption, the internal events will occur as soon as P is ready to perform them. In general, internal events occur as soon as they are ready, unless they are pre-empted beca...

The journal Real-Time Systems publishes papers, short papers and correspondence articles that concentrate on real-time computing principles and applications. The contents include research papers, invited papers, project reports and case studies, standards and corresponding proposals for general discussion, and a partitioned tutorial on real-time systems as a continuing series. The range of cov...