445 research outputs found
Distributed simulation optimization and parameter exploration framework for the cloud
Simulation models are becoming an increasingly popular tool for the analysis and optimization of complex real systems in different fields. Finding an optimal system design requires performing a large sweep over the parameter space in an organized way. Hence, the model optimization process is extremely demanding from a computational point of view, as it requires careful, time-consuming, complex orchestration of coordinated executions. In this paper, we present the design of SOF (Simulation Optimization and exploration Framework in the cloud), a framework which exploits the computing power of a cloud computational environment in order to carry out effective and efficient simulation optimization strategies. SOF offers several attractive features. Firstly, SOF requires “zero configuration” as it does not require any additional software installed on the remote node; only standard Apache Hadoop and SSH access are sufficient. Secondly, SOF is transparent to the user, since the user is totally unaware that the system operates on a distributed environment. Finally, SOF is highly customizable and programmable, since it enables the running of different simulation optimization scenarios using diverse programming languages – provided that the hosting platform supports them – and different simulation toolkits, as developed by the modeler. The tool has been fully developed and is available on a public repository1 under the terms of the open source Apache License. It has been tested and validated on several private platforms, such as a dedicated cluster of workstations, as well as on public platforms, including the Hortonworks Data Platform and Amazon Web Services Elastic MapReduce solution
Performance Analysis of Live-Virtual-Constructive and Distributed Virtual Simulations: Defining Requirements in Terms of Temporal Consistency
This research extends the knowledge of live-virtual-constructive (LVC) and distributed virtual simulations (DVS) through a detailed analysis and characterization of their underlying computing architecture. LVCs are characterized as a set of asynchronous simulation applications each serving as both producers and consumers of shared state data. In terms of data aging characteristics, LVCs are found to be first-order linear systems. System performance is quantified via two opposing factors; the consistency of the distributed state space, and the response time or interaction quality of the autonomous simulation applications. A framework is developed that defines temporal data consistency requirements such that the objectives of the simulation are satisfied. Additionally, to develop simulations that reliably execute in real-time and accurately model hierarchical systems, two real-time design patterns are developed: a tailored version of the model-view-controller architecture pattern along with a companion Component pattern. Together they provide a basis for hierarchical simulation models, graphical displays, and network I/O in a real-time environment. For both LVCs and DVSs the relationship between consistency and interactivity is established by mapping threads created by a simulation application to factors that control both interactivity and shared state consistency throughout a distributed environment
Center For Distributed Interactive Simulation Testing: Volume I Technical Proposal
Proposal for creating a Center for distributed interactive simulation testing which would provide facilities and capabilities for conducting conformance, interoperability and performance testing for the evolving Department of Defense-sponsored Military Standard for Distributed Interactive Simulation
PRODUCT LINE ARCHITECTURE FOR HADRONTHERAPY CONTROL SYSTEM: APPLICATIONS DEVELOPMENT AND CERTIFICATION
Hadrontherapy is the treatment of cancer with charged ion beams. As the
charged ion beams used in hadrontherapy are required to be accelerated to
very large energies, the particle accelerators used in this treatment are
complex and composed of several sub-systems. As a result, control systems
are employed for the supervision and control of these accelerators.
Currently, The Italian National Hadrontherapy Facility (CNAO) has the
objective of modernizing one of the software environments of its control
system. Such a project would allow for the integration of new types of
devices into the control system, such as mobile devices, as well as
introducing newer technologies into the environment.
In order to achieve this, this work began with the requirement analysis
and definition of a product line architecture for applications of the upgraded
control system environment. The product line architecture focuses on
reliability, maintainability, and ease of compliance with medical software
certification directives. This was followed by the design and development of
several software services aimed at allowing the communication of the
environments applications and other components of the control system, such
as remote file access, relational data access, and OPC-UA. In addition,
several libraries and tools have been developed to support the development
of future control system applications, following the defined product line
architecture.
Lastly, a pilot application was created using the tools developed during
this work, as well as the preliminary results of a cross-environment
integration project. The approach followed in this work is later evaluated by
comparing the developed tools to their legacy counterparts, as well as
estimating the impact of future applications following the defined product
line architecture.Hadrontherapy is the treatment of cancer with charged ion beams. As the
charged ion beams used in hadrontherapy are required to be accelerated to
very large energies, the particle accelerators used in this treatment are
complex and composed of several sub-systems. As a result, control systems
are employed for the supervision and control of these accelerators.
Currently, The Italian National Hadrontherapy Facility (CNAO) has the
objective of modernizing one of the software environments of its control
system. Such a project would allow for the integration of new types of
devices into the control system, such as mobile devices, as well as
introducing newer technologies into the environment.
In order to achieve this, this work began with the requirement analysis
and definition of a product line architecture for applications of the upgraded
control system environment. The product line architecture focuses on
reliability, maintainability, and ease of compliance with medical software
certification directives. This was followed by the design and development of
several software services aimed at allowing the communication of the
environments applications and other components of the control system, such
as remote file access, relational data access, and OPC-UA. In addition,
several libraries and tools have been developed to support the development
of future control system applications, following the defined product line
architecture.
Lastly, a pilot application was created using the tools developed during
this work, as well as the preliminary results of a cross-environment
integration project. The approach followed in this work is later evaluated by
comparing the developed tools to their legacy counterparts, as well as
estimating the impact of future applications following the defined product
line architecture
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