Resource Aware Modeling & Simulation

Resource Aware Modeling and Simulation (RAMS) (PDF) creates a virtual prototype that allows you to visualize, and interact with, your system in action.  This powerful methodology enables you to analyze performance, verify behavior and perform trade studies on architecture very early in your design cycle.  While these pages will provide a good overview of RAMS, we've prepared a whitepaper that fully explores RAMS and provides additional examples.

Introduction

Every system has two components:  What it does, and what it's built on.  These are common to every kind of system, from naturally occurring biological systems to business processes to complex embedded systems.  These two facets work together to complete the system's mission.  While they are connected, and place requirements on one another, they are distinct and separable.  The systems engineering discipline works to develop both facets of the system in order to fulfill the requirements of the system.  The challenge of optimizing a system is employing minimal resources to fully meet the system requirements.

We can define these two facets of a system as follows:

Behavior:  The behavior of the system is what it does in order to accomplish its objectives and fulfill its functional requirements.  "Functionality" is another word for behavior in this context.  The behavior of the system often consists of a collection of interconnected functional components, each of which performs some aspect of the job.

Platform:  The platform is the collection of resources that the behavior is implemented on.  A resource is something that supplies a good, or service, required by the behavior.  The platform consists of a variety of potentially interdependent resource components.

Both the behavior and the platform can be decomposed hierarchically to manage complexity.

The behavior and platform are truly separable.  Different platforms can underlie a given behavior, while the same platform can serve multiple behaviors.  For example, either a police officer resource, or a traffic signal resource can implement a manage traffic flow behavior.  Likewise, a police officer resource can serve either the manage traffic flow function or the enforce speed limit function.  In some circumstances, the police officer resource might make use of a patrol car resource in order to accomplish the manage traffic flow function.

The behavior clearly places requirements on the platform for operations that must be performed.  In turn, the platform places resource constraints on the behavior that ultimately determine the performance of the system.

Of course, costs are always associated with resources.  The specific nature of the cost depends on the resource.  Some examples of costs include capital expenditures for equipment, maintenance expenses, wages, time, power consumption, weight, bandwidth and so on.  Understanding the performance drivers for the system and how they interrelate is absolutely necessary to meet our overriding objective of building an optimal system (minimizing cost while meeting all of the requirements).

RAMS is a powerful tool to help you design and build fully optimized systems.  Users have employed the software for performance analysis and design to achieve this objective across a wide variety of systems engineering applications including business processes, embedded systems, avionics, web services, and software development.

 

RAMS Modeling Page:  1 - 2 - 3 Foresight's Approach to RAMS