Transcript Intergenic Data Warehousing

A Web-based Distributed
Simulation System
Christopher Taewan Ryu
Computer Science Department
California State University, Fullerton
Overview
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Project background
HLA
A web-based distributed simulation
Implementation approach
Future work
Project Background
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Telecommunication Forecaster Predictor (TFP)
– Performs analysis on communications between DSN sites
and spacecrafts
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Web-TFP (Web version of TFP)
– No program installation or upgrade
– No data updating and reconfiguration
– No license
– TFP anywhere and anytime with a browser
Architecture of Web-TFP
Linux or Solaris Server
Web
Browser
PHP/
JAVA
Matlab
CGI or
DWR
Matlab
Server
TFP
Client
Apache
Matlab
5
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Input
 Parameters, data files, and program
files
Operation
 Select a mission  Interface  Run
 Receive output
6
7
Computer Simulation
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Importance of Computer Simulation
– For significant cost saving, better control and understanding of
given objects and phenomenon
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Defense, medical, entertainment, etc.
– Important in building many mission-critical systems such as space
mission and defense applications--high cost and reliability.
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Challenges
– Developing a realistic complex simulation system requires
tremendous amount of time and effort
– Many simulation systems in different organizations (e.g., DoD,
NASA have developed various simulation systems in the past).
– Interoperability among different systems
– Reusability
High Level Architecture (HLA)
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First developed by the DoD
– To support interoperability and reuse
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HLA has been standardized for distributed computer
simulations under IEEE Standard 1516.
– Any system that conform to the standard can work with any HLA
implementation based on the same standard
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Several open-source implementations of HLA such as
Open HLA (OHLA) and Portico are available (in Java,
C++).
– Portico fully conform to IEEE Standard 1516.
HLA Framework
…
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RTI is the fundamental component of HLA
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Provides a set of software services that are necessary to support federates to
coordinate their operations and data exchange during a runtime execution.
Simulations don’t communicate with each other directly. All
communications among simulations are managed by RTI
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providing high scalability, interoperability, and reusability of components.
USE Case Diagram for Our Project
Architecture
GUI (Java Web Start)
Simulation
Monitor
(Java 3D)
HLA
Web
Service
Proxy
Federate
RTI
Simulation
Controller
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Federate
Proxy federate is to support Web service (implementation of SOA)
Web service and HLA provides different levels of interoperability
– Scalability and performance
Deployment Environment
Environment Setup
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Portico for RTI
– Can run on Windows, Linux, or Mac platforms.
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Apache Tomcat
 Apache Axis
 Java 3D
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Target simulations, Internet, Browser
Detailed Deployment
Interfaces
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Simulation objects are be added using the console
Simulation in Operation
Advantages and Disadvantages of
Web Services in HLA
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Advantages
– Substantially larger set of development environment and
languages (that can be supported by HLA)
– Easier to deploy HLA federates in WAN environment using
HTTP protocol (stateless)
– Larger scale of interoperability
– Can you web browser as interface (all advantages of web
browser)—particularly important to our project
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Disadvantages
– Lower performance than C++ or Java API
– May require additional knowledge on Web service and HTTP
Future Work
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Migrate the Web-TFP or other related
systems to the HLA-based platform
 Provide 3D interfaces for users for better
interaction
Thank you.