There is considerable debate on the appropriate discrete choice framework for examining injury severity. Researchers in the safety field have employed ordered and unordered frameworks for examining the various factors influencing injury severity. The objective of the current study is to investigate the performance of the ordered and unordered response frameworks at a fundamental level. Towards ...

This paper studies a phase field model for the mixture of two immiscible and incompressible fluids. The model is described by a nonlinear parabolic system consisting of the nonstationary Stokes equations coupled with the Allen-Cahn equation through an extra phase induced stress term in the Stokes equations and a fluid induced transport term in the Allen-Cahn equation. Both semi-discrete and ful...

R. Verma G. R. Plaschka B. Hanlon A. Livingston K. Kalcher This paper presents an overview of the science and art of discrete choice modeling for service sector applications. With the ongoing momentum of service science, management, and engineering, the discrete choice modeling approach provides a sophisticated tool kit for assessing the needs and preferences of service customers. We provide di...

The minimum phase systems have ultimately been redefined for LTI discrete-time systems, at first SISO and later square MIMO ones, as those systems for which minimum variance control (MVC) is asymptotically stable, or in other words those systems who have ‘stable’ zeros, or at last as ‘stably invertible’ systems. The redefinition has soon been extended to nonsquare discrete-time LTI MIMO systems...

In the software reliability engineering literature, few attempts have been made to measure software reliability using discrete time modeling. One of the reasons can be attributed to the mathematical complexity involved in constructing such models. The proposed unified modelling approach provides a broad framework for developing NHPP type of discrete SRGMs. The framework adopts the number of tes...

A new algorithm for modeling radiative transfer in inhomogeneous three-dimensional media is described. The spherical harmonics discrete ordinate method uses a spherical harmonic angular representation to reduce memory use and time computing the source function. The radiative transfer equation is integrated along discrete ordinates through a spatial grid to model the streaming of radiation. An a...

Proposed in the paper is an approach to generate the PLC code from the Discrete Event System Specification (DEVS) model. DEVS have been widely accepted to model the real system for the discrete event system simulation. The objective of this paper is to generate PLC control code from the DEVS model. To achieve it, this paper proposes two steps. First step is to convert the real system into the v...

Block diagram languages are now commonly used to design and even implement embedded systems. In the design phase, they are used to model both plant and controller, typically with continuous and discrete modeling respectively. The semantics of these languages are often vague and/or complex, which is fine for some users but leaves others puzzled by the behaviors they observe. This paper presents ...

We introduce a discrete paradigm for developable surface modeling. Unlike previous attempts at interactive developable surface modeling, our system is able to enforce exact developability at every step, ensuring that users do not inadvertently suggest configurations that leave the manifold of admissible folds of a flat two-dimensional sheet. With methods for navigation of this highly nonlinear ...

Hybrid technical systems combine discrete-state event-driven and continuous-state time-driven behavior. In this contribution, a general modeling formalism for such systems is proposed. The discrete subsystem is represented by an interpreted Petri net. In addition to external continuous inputs, discrete variables dependent on the net marking aaect the continuous subsystem which is a time-driven ...