Cognitive science emphasizes the strength of visual formalisms for human learning and problem solving. In software engineering, a clear, visual presentation of a system’s architecture can significantly reduce the effort of comprehension. Yet, all too often the documentation of complex software systems lacks clear identification of the architectural constituents and insufficiently relates them t...

Vehicular traffic simulations are useful in applications such as emergency planning and traffic management, for rapid response and resilience. Here, a parallel traffic simulation approach is presented that reduces the time for simulating emergency vehicular traffic scenarios. We use a reverse computation-based optimistic execution approach to parallel execution of microscopic, vehicular-level m...

This project is exploring the use of parallel discrete event simulation techniques to perform instructionlevel simulations of large-scale multiprocessor systems. The large memory and computational requirements of such simulations and the inherent parallelism of the problem domain suggest the use of parallel simulation techniques. However, a critical challenge lies in ensuring proper synchroniza...

Despite their potential applications in software comprehension, it appears that dynamic visualisation tools are seldom used outside the research laboratory. This paper presents an empirical evaluation of five dynamic visualisation tools AVID, Jinsight, jRMTool, Together ControlCenter diagrams and Together ControlCenter debugger. The tools were evaluated on a number of general software comprehen...

Pressures are mounting for the adoption of a Global Biodiversity Framework that transforms conservation and sustainable use efforts worldwide. Underlying this challenge is biodiversity paradox: biological diversity predominantly concentrates in tropics, while human, institutional, financial resources primarily located at higher latitudes both north south. Addressing paradox requires expansion m...

Environmental concern and consumer rights have entailed e-tailers to adopt better strategies to facilitate product returns from customers. As the demand for reverse logistics (RL) continues to grow, little is known about what motivates e-tailers to enhance their RL capabilities and about the role RL capabilities plays in enabling e-tailers to achieve better customer satisfaction and economic pe...

Current deadlock control approaches for WSPR (Weighted Systems of Simple Sequential Processes with Resources Requirement) suffer from incorrect liveness characterization based on the concept of deadly marked siphons (DMS). We discover that nonlive transitions may exist even though there are no DMS. That is, the net model may be weakly live or in livelock states under no DMS. It is live under a ...

This paper proposes a generalized WS/PS model studying the impact of public spending on employment, in the presence of imperfect competition in labour and product markets. Public spending is shown to a¤ect …rms pro…t margins and …rms labour demand schedules. The model highlights a new channel by which …scal policy can improve employment. By reducing …rms’mark-up, public spending helps counterin...

In this letter, a new addressing scheme for hexagonal networks is proposed. Using the new addressing scheme, many routing algorithms designed for networks using square-based topologies such as mesh and torus can also be applied to hexagonal networks. Methods of applying the turn model to hexagonal networks are derived, with some new minimal and partial adaptive routing algorithms obtained. Simu...