This paper describes important features of JAPROSIM, a free and open source simulation library implemented in Java programming language. It provides a framework for building discrete event simulation models. The process interaction world view adopted by JAPROSIM is discussed. We present the architecture and major components of the simulation library. A pedagogical example is given in order to i...

In this paper we investigate an intelligent discrete event method suitable for modeling, simulation and control of hybrid systems. More in detail, a Fuzzy logic approach based on Discrete Event System Specification (DEVS), which is a main part of Intelligent-DEVS (I-DEVS), is emphasized in the present work. We show that the resulting Discrete Event Fuzzy Logic (DEFuL) is faster than conventiona...

SONET is a standard for fiber-optics equipment. At Bellcore we have developed PHOTON, a research prototype software system for simulating a subset of SONET. PHOTON is intended to analyze interoperability, i.e. the ability of SONET equipment from different manufacturers to work with one another. This paper describes the implementation of PHOTON. The implementation was done using DMOD, a formaliz...

There are two general approaches to computer-based statistical modeling that are used by business managers. (In essence, there are two mathematical approaches to creating the underlying "engines" that execute the models.) One approach is referred to as Systems Dynamics and the other is termed Discrete Event Simulation. Either can be effective in analyzing business problems, though as a generali...

The DEVS formalism was defined as a method for modeling and discrete event systems. DEVS theory evolved and it was recently upgraded in order to permit modeling of continuous and hybrid systems. We have built a compiler of a subset of Modelica, and built a translator into DEVS models. We show how to model these dynamic systems under the discrete event abstraction. Examples of model simulations ...

The DEVS framework of discrete event modeling is known to be compatible with the object-oriented (OO) world view. This paper proposes a methodology for the OO development of war game models within the framework. The methodology develops war game models at two layers: a discrete event system (DES) layer and an object model (OM) layer. Within the methodology the DES layer represents abstract beha...

Discrete event simulation is used to model, study, plan, and improve systems in which random events play a dominant role. These systems are often driven by complicated mathematical and logical relationships, making it impossible to derive an analytical solution. The journal OR/MS Today cites simulation software as one of the most widely used tools in operations research, due in part to its appl...

Research on travel demand modeling has primarily focused on weekday activity-travel patterns. However, weekend activities and travel constitute a major component of individuals’ overall weekly activity-travel participation. This paper describes a modeling effort that focuses on discretionary-event weekend activity-travel demand. This study bridges the gap in the literature by modeling discretio...

The unique features of the object-oriented modeling language Modelica to model combined continuous time and discrete event systems are discussed. A hybrid Modelica model is described by a set of synchronous differential, algebraic and discrete equations leading to deterministic behaviour and automatic synchronization of the continuous and discrete parts of a model. The consequences of this view...

So far there have been several efforts for developing software process simulators. However, the approaches for developing the simulators seem to have been adhoc and no systematic methodology exists. Since modeling and simulation in support of software development should become more popular (and there are signs that it does), there is a need for migrating modeling from craft to engineering. This...