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Factor trees are relatively simple causal diagrams that indicate the many factors contributing to a phenomenon or effect at a snapshot in time. They consist of nodes and directional arcs (arrows) arranged in nearly hierarchical layers so that the effect can be seen as depending on a few high-level factors, but with those depending in turn on more detailed factors. This paper is a primer on building...
Telecommunication networks are evolving to become more reliable, but many networks remain vulnerable to widespread systemic failures. Reliability of individual components has improved and some networks can achieve availabilities on the order of 0.99999. However, the routing technologies used by these networks, like Open Shortest Path First and Border Gateway Protocol can create system-wide vulnerabilities...
This paper describes an industrial project aiming to enhance the existing simulation modeling suites used at a car engine factory in the UK. The company continues to enhance its simulation modeling capabilities towards so called the ‘total plant modeling’ which not only covers the production facilities but also key ancillary facilities. Tool delivery is one such ancillary process. The existing modeling...
The aim of this essay is to encourage the application of the hybrid simulation, combining the discrete and the continuous simulation methodologies. With a conceptual literature review of discrete (Discrete Event) and the continuous (System Dynamics) simulation methodologies that reveals their main features and potential of applicability, it is possible to define the potential of developing hybrid...
In general, it is quite difficult to describe and model operations and conveyance systems precisely in underground coal mines because of geological components, poor visibility, unreliable installed facilities, and difficult work conditions. In this study, a simulation model of an operations and materials handling system for an underground coal mine was built to investigate the relationship between...
This paper introduces a major new cross-disciplinary research project that looks at the UK health and social care system, as part of an ambitious, broader initiative to apply methods from complexity science to a range of key global challenges. This particular project aims to develop new, integrated models for the supply and demand of both health and social care, in the context of the societal change...
In recent years more focus has been placed on integrated health and social care services within most western countries. Despite the reported importance of this area, it has not been explored enough in simulation research. Current modeling methods of healthcare systems focus on compartmentalized and specific specialties, such as emergency room modeling. Integrated care services, on the other hand,...
In this paper we discuss verification and validation of simulation models. Four different approaches to deciding model validity are described, a graphical paradigm that relates verification and validation to the model development process is presented, and various validation techniques are defined. Conceptual model validity, model verification, operational validity, and data validity are discussed...
The use of simulation to study complex systems having both productivity and sustainability related performance measures seems to be growing at a rapid pace. This paper describes the recent developments and discusses potential future capabilities of a sustainability toolkit for simulation. The intent of the toolkit is to make sustainability related performance measures as easy to model and collect...
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