A procedure for the description of power electronics circuit dynamics is proposed with the intention of control system design and discrete-time system simulation. The a,pproach is specially suited to be used along with computer-aided analysis and synthesis software packages such as MATLAB. The various modelling steps are illustrated by an application to a dcldc converter under different control...

Complexity and complex systems have been intriguing research objectives since the discovery of the well known Aristotelian paradox: the whole is more than the sum of its parts. While defining complexity remains elusive and “emergent”, studying complex systems may be the only way towards further conceptual insights. However, current day techniques of modelling and simulating are not subject to p...

The computer-based simulation of military tactics has largely involved the use of platform-dependent scripting resulting in behaviour that is limited, and difficult to debug and reuse. The Tactics Development Framework (TDF) addresses these shortcomings by providing design-level support for tactics modelling. Its integration with VBS3 is reported here.

We report here our research on the modelling of biological circadian rhythms (i.e. ∼ 24 h) in a unicellular green alga, Ostreococcus tauri. Such rhythms are the result of the regulation of genetic transcription. We present several models designed by physicians and computer scientists, in order to identify molecular actors of the circadian clock. We therefore compare biological assumptions, simu...

We contrast the concepts of computational simulation as practiced in computer assisted design with that of numerical modeling of geology and other observational sciences in which controlled experiments are not available. We highlight the role of the modeller in subjectively weighting observations, modelling and experience to find a preferred geological model.

The purpose of this study is to develop a formulation for a once-a-day peroral application with controlled release of nitrendipine. The second aim of the study is to define by the use of modelling and computer simulation those critical points in the development of the formulation, the knowledge and controlling of which brings a rationalisation in the sense of time and material.

Many healthcare organizations are now making good use of electronic health record (EHR) systems to record clinical information about their patients and the details of their healthcare. Electronic data in EHRs is generated by people engaged in complex processes within complex environments, and their human input, albeit shaped by computer systems, is compromised by many human factors. These data ...

Phase-type (PH) distributions are proven to be very powerful tools in modelling and analysis of a wide range of phenomena in computer systems. The use of these distributions in simulation studies requires efficient methods for generating PH-distributed random numbers. In this work, we consider the cost of PH-distributed random-number generation.

The SNE special issues on Object-oriented and Structural-dynamic Modelling and Simulation emphasize on recent developments in languages and tools for object-oriented modelling of complex systems and on approaches, languages and tools for structural-dynamic systems. Computer aided modelling and simulation of complex systems , using components from multiple application domains, have in recent yea...