Integrating HLA with Scilab

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Integrating HLA with Scilab

• Thitima Theppaya, Pichaya Tandayya, Chatchai
  Jantaraprim
• Department of Computer Engineering,
• Faculty of Engineering,
• Prince of Songkla University,Thailand

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Integrating HLA with Scilab 05F-SIW-010
Outline

• Motivation
• Aims
• HLA Introduction
• HLA Background
• Scilab and its Interface
• The HLA Integration
• Test Simulation Model
• Conclusions and Future Works

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Motivation

• Most simulation developers are not computer
  engineers or
• computer scientists, so do not have detailed
  programming knowledge.
• As a consequence, this group usually prefers to
  use mathematical and engineering tools,
  ready-made functions, that do not require
  programming.
• Scilab can help create complex graphical and
  mathematical models or objects used in virtual
  environments.

Integrating HLA with Scilab 05F-SIW-010
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Integrating HLA with Scilab 05F-SIW-010
Outline

• Motivation
• Aims
• HLA Introduction
• HLA Background
• Scilab and its Interface
• The HLA Integration
• Test Simulation Model
• Conclusions and Future Works

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Aims

• The integration enables Scilab users to apply
  simulation techniques to larger and more complex
  interactive models using networked computers.
• This work will allow developments of low cost
  distributed interactive applications with Scilab.

Integrating HLA with Scilab 05F-SIW-010
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Integrating HLA with Scilab 05F-SIW-010
Outline

• Motivation
• Aims
• HLA Introduction
• HLA Background
• Scilab and its Interface
• The HLA Integration
• Test Simulation Model
• Conclusions and Future Works

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HLA Introduction

• The Standard HLA has capability to implement
  distributed interactive simulations
• - enables developer to reuse current
  simulation to new simulation
• - allows interoperability between different
  system or
• programming language

Integrating HLA with Scilab 05F-SIW-010
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Integrating HLA with Scilab 05F-SIW-010
Outline

• Motivation
• Aims
• HLA Introduction
• HLA Background
• Scilab and its Interface
• The HLA Integration
• Test Simulation Model
• Conclusions and Future Works

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HLA Background
The HLA consists of simulation rules, Object
Model Template (OMT) and interface specification.

• The local RTI component consists of RTI library
  (libRTI).
• The central RTI components are RTIExec and
  FedExec.

Integrating HLA with Scilab 05F-SIW-010
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Integrating HLA with Scilab 05F-SIW-010
Outline

• Motivation
• Aims
• HLA Introduction
• HLA Background
• Scilab and its Interface
• The HLA Integration
• Test Simulation Model
• Conclusions and Future Works

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Scilab and its Interface
The structure of Scilab. Developers can add
libraries from external programs.
Integrating HLA with Scilab 05F-SIW-010
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Scilab and its Interface (cont)
The interaction between Scilab and an external
program via a gateway file.

• The intersci tool in Scilab was used to
• create a gateway file for transferring input and
  output between the Scilab and the external
  program.
• create a dynamic library for loading functions
  from the external program into Scilab.

Integrating HLA with Scilab 05F-SIW-010
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Integrating HLA with Scilab 05F-SIW-010
Outline

• Motivation
• Aims
• HLA Introduction
• HLA Background
• Scilab and its Interface
• The HLA Integration
• Test Simulation Model
• Conclusions and Future Works

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The HLA Integration

• Scilab and RTI

• The HLA module composes of
• gateway file for calling the HLA module in
  Scilab.
• - The gateway function receives and checks
  parameters, then creates variables for Scilab.
• operation file for calling the RTI via
  RTIambassador.
• callback file for the RTI to call the Scilab
  functions, via FederateAmbassador.

Integrating HLA with Scilab 05F-SIW-010
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The HLA Integration (cont)

• The interface sequence between Scilab and RTI

The Gateway file checks parameters received from
Scilab before passing them to the operation file.
Integrating HLA with Scilab 05F-SIW-010
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The HLA Integration (cont)

• The languages interface used in the system

The C program receives the callback return
value reflected from the RTI via
FederateAmbassador, and wraps it in a call to a C
interface.
Integrating HLA with Scilab 05F-SIW-010
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Integrating HLA with Scilab 05F-SIW-010
Outline

• Motivation
• Aims
• HLA Introduction
• HLA Background
• Scilab and its Interface
• The HLA Integration
• Test Simulation Model
• Conclusions and Future Works

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Test Simulation Model
The HLA module interface in Scilab.
Integrating HLA with Scilab 05F-SIW-010
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Test Simulation Model (cont)

• Scenario of the test federation
• The testing problem is to find routes across
  city maps.
• The federates represent city tourist offices for
  travellers.
• Each federate has its own city map, represented
  by a graph, and provides a collection of maps for
  nearby cities.
• Each federate must subscribe to map updates from
  the
• other cities since maps can be dynamically
  updated.
• The distributed graphs consist of nodes and
  connecting routes.
• Each graph represents a city map running on a
  Scilab federate.

Integrating HLA with Scilab 05F-SIW-010
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Test Simulation Model (cont)
Each graph is composed of - nodes
representing places in the city - routes
connection nodes, which represent roads.
Integrating HLA with Scilab 05F-SIW-010
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Test Simulation Model (cont)

• The objects are the map, and the attributes are
  the nodes and routes.
• The interaction is made by sharing the attributes
  of objects running in the federation.

Integrating HLA with Scilab 05F-SIW-010
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Test Simulation Model (cont)

• Interaction in the test simulation model

Data exchange amongst federates
Integrating HLA with Scilab 05F-SIW-010
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Test Simulation Model (cont)

• Collaboration of the distributed Scilab models
  using
• HLA Join and leave

Some functions have been combined, e.g.,
rtiAmb.createFederationExecution(),
rtiAmb.joinFederationExecution() replaced by
gen_and_join()
Integrating HLA with Scilab 05F-SIW-010
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Test Simulation Model (cont)

• Collaboration of the distributed Scilab models
  using
• HLA Update

Sequence diagram of the update process.
Integrating HLA with Scilab 05F-SIW-010
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Integrating HLA with Scilab 05F-SIW-010
Outline

• Motivation
• Aims
• HLA Introduction
• HLA Background
• Scilab and its Interface
• The HLA Integration
• Test Simulation Model
• Conclusions and Future Works

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Conclusions

• HLA module from integration of the HLA with
  Scilab can enable Scilab to carry out distributed
  interactive simulation.
• Necessary RTI library services have been
  implemented
• and tested.
• Scilab can participate in distributed
  interactive simulations using HLA through the
  RTI, and publish object attributes over the
  network.
• Our Scilab HLA module does not affect the
  standard Scilab functions.

Integrating HLA with Scilab 05F-SIW-010
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Future Work

• There are more HLA services to be tested,
  including data distribution management, time
  management and ownership management.

Integrating HLA with Scilab 05F-SIW-010