The proceedings contain 28 papers. The special focus in this conference is on Applied Formal Methods. The topics include: High level system design and analysis using abstract state machines;enriching the software deve...
ISBN:
(纸本)3540664629
The proceedings contain 28 papers. The special focus in this conference is on Applied Formal Methods. The topics include: High level system design and analysis using abstract state machines;enriching the software development process by formal methods;formal program development in geometric modeling;design of distributed multimedia applications;structured formal verification of a fragment of the IBM S/390 clock chip;automated test set generation for statecharts;rigorous compiler implementation correctness;a practical hierarchical design by timed simulation relations for real-time systems;a lightweight approach to formal methods;an open environment for the integration of heterogeneous modelling techniques and tools;integrating domain specific language design in the software life cycle;flexible and reliable process model properties;an integrated approach;a symbolic model checker for ACTL;critical systems validation and verification with CSP and FDR;uniform perspectives for formal methods;a higher order tool integration framework;two real formal verification experiences;formal methods in the specification of the emergency closing system of the eastern scheldt storm surge barrier;the new topicality of using formal models of security policy within the security engineering process;the ASM workbench tool environment and architecture;lightweight formal methods;KIV 3.0 for provably correct systems and an experience report.
Popular multicast applications that allow group communication using real-time audio and video have enabled a wide variety of online meetings, conferences and panel discussions. The ability to record and later replay t...
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ISBN:
(纸本)3540667822
Popular multicast applications that allow group communication using real-time audio and video have enabled a wide variety of online meetings, conferences and panel discussions. The ability to record and later replay these sessions is one of the key functionalities required for a complete collaboration system. One of the unsolved problems in archiving these interactive sessions is the lack of any method for recording sessions at the highest possible quality. Since audio and video transmissions are typically sent unreliably, there may be a wide variance in recorded quality depending on where the recorder is placed relative to the various sources. This is especially problematic if multiple sources are active in a single session. In addition, because of congestion control schemes that send high-quality, high-rate data to local receivers, and low-rate data in the wide area, different sets of data may be available in different areas of the network for any given session. In response to these challenges. we have developed a system that uses multiple distributed recorders placed at or near the sources of the session. These recorders serve as data caches that transmit data to archives. The archive systems collate the data from various recorders and create a high-quality recorded session, which is then available for playback. In this paper, we present the tradeoffs involved in architecting a distributed recording system, and present our design for a fault-tolerant, scalable system that also supports a wide range of heterogeneity in end-system connectivity and processor speed. This is achieved in our system through the use of decentralized, shared control protocols that allow simple and fast fault recovery, and decentralized, multicast data collection protocols that allow multiple systems to share data collection bandwidth. We describe and implementation of the system using the MASH multimedia toolkit, the libsrm reliable multicast protocol framework, and the AS1 active service
The paper examines the technology of composability in simulation systems. Composability refers to the ability of a simulation to be flexibly configured to adapt to a range of missions, scenarios, simulation models, ha...
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ISBN:
(纸本)0818685948
The paper examines the technology of composability in simulation systems. Composability refers to the ability of a simulation to be flexibly configured to adapt to a range of missions, scenarios, simulation models, hardware environments, and security configurations. Composability confers maximum flexibility to the usage of the simulation. simulation composability is a requirement of the Joint simulation System (JSIMS). JSIMS is currently being developed by the US Department of Defense and is intended To deliver commander and command staff training. The paper examines simulation composability from the JSIMS perspective and explores the overall technical approach and the related issues.
A new approach to handling battle simulation lethality is presented. In this approach a single server provides standard DIS damage states to entities fast enough for most realtimeapplications. Benefits include freei...
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ISBN:
(纸本)0818685948
A new approach to handling battle simulation lethality is presented. In this approach a single server provides standard DIS damage states to entities fast enough for most realtimeapplications. Benefits include freeing DIS simulations from the burden of maintaining damage state tables, lower DIS pre-exercise preparation, and Easier scenario configuration as a whole. These benefits are realized primarily because efforts to prepare and maintain the vulnerability data pertaining to the exercise are not duplicated.
This paper discusses the development of a Generic Interface that will enable traditional non- object-oriented applications to become HLA compliant. By providing Sol both DIS and HLA, the proposed interface can support...
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ISBN:
(纸本)0818685948
This paper discusses the development of a Generic Interface that will enable traditional non- object-oriented applications to become HLA compliant. By providing Sol both DIS and HLA, the proposed interface can support not only new but existing or legacy software applications as well. in addition, the interface will make it easy for simulationapplications that today require a standard networking protocol as a backbone to use DIS components in place of corresponding HLA components as air interim solution. After a general overview of the concept of a Generic Interface, the paper then proceeds with a description of the interface components and how they can be used to harmonize the various applications involved in a simulation.
The High Level Architecture (HLA provides the specification of a common technical architecture for use across all classes of simulations in the US Department of Defense. It provides the structural basis for simulation...
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ISBN:
(纸本)0818685948
The High Level Architecture (HLA provides the specification of a common technical architecture for use across all classes of simulations in the US Department of Defense. It provides the structural basis for simulation interoperability. The baseline definition of the HLA includes the HLA Rules, The HLA Interface Specification, and the HLA Object Model Template. The HLA Rules are a set of 10 basic rules that define the responsibilities and relationships among the components of an HLA federation. The HLA Interface Specification provides a specification of the functional interfaces between HLA federates and the HLA Runtime Infrastructure. The HLA OMT provides a common presentation format for. HLA simulation and Federation Object Models. This paper provides a description of the development of the HLA, a technical description of the key elements of architecture, and a discussion of HLA implementation, including HLA supporting processes and software.
Simulator time-delays (latencies) are an important factor in the simulation world. In research and/or training, an), high-fidelity simulation is adversely affected by latencies. The simulation Network Analysis Project...
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ISBN:
(纸本)0818685948
Simulator time-delays (latencies) are an important factor in the simulation world. In research and/or training, an), high-fidelity simulation is adversely affected by latencies. The simulation Network Analysis Project ((SNAP) was developed to investigate these latencies. The SNAP system can measure latencies between vital points (stick input, state variables, visual displays, and the Network Interface Unit - or any other points of interest) in a stand-alone simulator and between networked simulators. Data correlation is accomplished via Global Positioning System (GPS) time-stamping. This paper will report on the findings from past latency measurements and key lessons learned. Factors affecting latency: such as network configuration (hardware and software), simulator modifications;and network loading will be discussed.
Embedded control systems are increasing in complexity. This paper describes a modelling and simulation environment which can efficiently handle the horizontal and vertical integration of both the hardware and the soft...
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ISBN:
(纸本)0818685948
Embedded control systems are increasing in complexity. This paper describes a modelling and simulation environment which can efficiently handle the horizontal and vertical integration of both the hardware and the software design process. The focus is on simulation and its control aspects, detailing the respective algorithms. The work is conducted within the OMI/TOOLS project funded by the European community.
We are developing a next generation multimedia server that provides fully interactive access to tremendous amounts and varieties of real-time and non real-time multimedia data by hundreds of simultaneous clients. Curr...
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ISBN:
(纸本)0818685948
We are developing a next generation multimedia server that provides fully interactive access to tremendous amounts and varieties of real-time and non real-time multimedia data by hundreds of simultaneous clients. Current multimedia servers are inadequate for this task given their support Of only basic multimedia data types, inherently), non-interactive access semantics and/or intrinsic scaling limitations. Our solution abandons the common use of striping and object replication, and implements a random data allocation scheme across a cluster of commodity computers. This scheme provides implicit load balancing both within and among storage nodes of the cluster while supporting virtually any multimedia data type and application access pattern. This paper presents the essential background, design and implementation, and simulation studies of the storage server component of our system. Our results show that Mie can guarantee with high probability that all arbitrary I/O requests can be satisfied within a small delay bound while obtaining high system utilization. Although our specific application is a real-time multimedia storage server, techniques developed here can be applied to scalability in distributed systems in general.
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