Real-time collision-free path planning and tracking control of a nonholonomic mobile robot in a dynamic environment is investigated using a neural dynamics based approach. The real-time robot path is generated through a dynamic neural activity landscape of a topologically organized neural network that represents the changing environment. The dynamics of each neuron is characterized by an additi...

Landscape structure results from complex interactions between geomorphology, climate, disturbance and succession. SELES is a tool for building spatially explicit simulations to model the role of disturbance in creating and maintaining landscape structure. Models built with SELES are raster-based, semi-Markov, whole landscape models (sensu Baker 1989) which use probabilistic disturbance spread. ...

The paper presents the formal modeling and simulation framework for mobile agent systems . A Mobile Discrete Event System Specification (MDEVS) formalism is proposed to represent the dynamics of mobile agent systems . The MDEVS formalism supports the structural changes of systems that include creation, addition, deletion, and migration of models and the dynamic changes of couplings between mode...

We consider it a great privilege to introduce this two-part issue on Hybrid Systems to Discrete Event Dynamic Systems: Theory and Applications. Hybrid dynamical systems constitute an abstract modeling framework for systems with bi-layer dynamics: time-driven dynamics at the lower layer, and discrete-event dynamics at the upper layer. This framework provides useful analysis techniques and simula...

The usefulness of simulation and enactment in business process modelling is explored by means of studying a simple process. Two roles with interactions (contacts), rework and choices collaborate in the production of a document (loan, policies, etc.) From its Role Activity Diagram (RADs), we construct models for Discrete Event (DE) and System Dynamics (SD) simulation and Process Enactment (PE) i...

System dynamics models have been used to address strategic questions in many hundreds of companies and government agencies around the world over the past 40 years, including a broad range of organizations in the transport sector. However, this technique remains less well known than other approaches among potential client organizations and within the simulation community. This paper provides a p...

This paper presents the development of a simulation test bed for a command, control, computer, communication, intelligence, surveillance and reconnaissance (CISR) system. The test bed features coordination of a rotorcraft unmanned aerial vehicle (RUAV) and multiple unmanned ground vehicles (UGVs) by integrating a high-fidelity rotorcraft model with actual ground-based robots that emulate UGVs. ...

The aim of the PhD research was to contribute to improving fisheries management. The overall purpose was to select applicable modeling techniques, develop models and simulate the dynamics of fisheries management with the aim of comparing different management strategies by looking at their impact on selected indicators. The indicators are biological, economic or social. The main contribution of ...

Analysis of large, complex systems requires simulations of hybrid-system dynamics, i.e., dynamics which are best described by a combination of continuous-time and discrete-event models, and their interactions. To serve as valuable research tools, such simulations need also be computationally efficient, readily modifiable, and open to a wide range of component modules. This paper describes the d...