The proceedings contain 60 papers. The topics discussed include: a mobile guide system for visually disabled persons;dynamic power saving strategy and data system for future shinkansen traffic control;elementary versu...
ISBN:
(纸本)0769501370
The proceedings contain 60 papers. The topics discussed include: a mobile guide system for visually disabled persons;dynamic power saving strategy and data system for future shinkansen traffic control;elementary versus composite interfaces in distributedreal-time systems;real-time communication in autonomous robot systems;adaptable real-timedistributedobject management for command and control systems;an object model of autonomous control processor and the message selection method;object-based protocol for replicated objects;flexible and robust cim architecture using distributedobjects;flow oriented approach for human-centered agile manufacturing systems;modeling manufacturing resources based on agent model;and atomicity of transaction processing in heterogeneous autonomous decentralized system.
The following fundamental issues in establishing sound architectures for objectoriented (OO) realtime (RT) distributedcomputing systems (DCSs) are briefly discussed: (1) How much is the fixed priority assignment re...
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The following fundamental issues in establishing sound architectures for objectoriented (OO) realtime (RT) distributedcomputing systems (DCSs) are briefly discussed: (1) How much is the fixed priority assignment relevant to the activities of distributedobject designers? (2) Can the event-triggered architecture and the time-triggered architecture be combined into a unified architecture?.
distributedobjects (DO) as defined by OMG's CORBA architecture provide a model for object-oriented parallel distributedcomputing. The parallelism in this model however is limited in that the distribution refers ...
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objectoriented techniques have been along the last decade one of the most useful programming paradigms. However, for distributed embedded systems, the semantic gap between the object orientation layer and the underly...
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objectoriented techniques have been along the last decade one of the most useful programming paradigms. However, for distributed embedded systems, the semantic gap between the object orientation layer and the underlying infrastructure is extremely large. This gap can be narrowed, should the embedded system platform provide semantically rich communication and management services. The paper outlines our research effort in the provision of such services by CAN based (Controller Area Network) systems.
The paper presents a quantitative evaluation of the temporal behavior of objectoriented programs implemented using different programming environments. The main focus of the evaluation is the realtime properties and ...
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The paper presents a quantitative evaluation of the temporal behavior of objectoriented programs implemented using different programming environments. The main focus of the evaluation is the realtime properties and the overhead caused by each layer of the underlying communication architecture, in order to verify the suitability of those environments for developing distributedrealtimeobjectoriented systems. In the current state of the work, Java/RMI running over Windows 95 and AO/C++ running over QNX OS are compared. An extension of the comparison to include DCOM/Windows95, DCOM/Windows NT and objectime/Windows NT is under development.
realtimedistributed applications based on objectoriented technology raise many complex issues, most of them still open. We elaborate on the reasons why traditional paradigms, found adequate for tackling simple prob...
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realtimedistributed applications based on objectoriented technology raise many complex issues, most of them still open. We elaborate on the reasons why traditional paradigms, found adequate for tackling simple problems, cannot help in addressing these complex issues. A detailed illustration is given with a problem in modular avionics, which has been addressed by resorting to proof based system engineering, an emerging discipline aimed at coping with real world problems complexity. Drawing from our experience with partners in industry, we report on why such paradigms and technologies as object orientation, distributed transactions, distributed architectures, transactional monitors, can be contemplated for the construction of realtimedistributed systems, provided that appropriate online decision making algorithms and protocols are resorted to.
This paper deals with large, distributedreal-time systems that have execution times and resource utilizations which cannot be characterized a priori. (The motivation for our work is provided in part by the characteri...
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The commonly recognized weakness of modern objectoriented design and implementation methodologies lies in their superficial treatment of inter-object dynamics. The paper describes a software toolbox called ODYMOT tha...
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The commonly recognized weakness of modern objectoriented design and implementation methodologies lies in their superficial treatment of inter-object dynamics. The paper describes a software toolbox called ODYMOT that integrates a number of approaches to the problem of behavior modeling. In order to achieve design flexibility, a two-layer object design architecture is used that blends together objectoriented design concepts with those of high level Petri nets. The Petri net representation creates an additional access layer of object architecture, providing meta level object control with the sequencing of method execution. This modeling approach allows one, both mathematically and pragmatically, to achieve a more precise and flexible description and implementation of realtime and distributed models.
The automotive industry has been late in introducing objectoriented (OO) analysis, design, and programming, compared to many other businesses. This is partly due to the fact that OO programming has been considered to...
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The automotive industry has been late in introducing objectoriented (OO) analysis, design, and programming, compared to many other businesses. This is partly due to the fact that OO programming has been considered too expensive in terms of computational resources, but also because there are elements in the application functions for which OO methods do not give sufficient support. Nevertheless, OO techniques provide many advantages, and we discuss how they can be used for automotive realtime control applications. The suggested approach is holistic in the following respects: it treats functionality on the vehicle level rather than on individual control units; it includes both the embedded system and its environment; and it considers both hardware and software.
The paper describes the tools and techniques being applied in the TINA Open Service Creation Architecture (TOSCA) project to develop objectoriented models of distributed telecommunication services in SDL. The paper a...
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The paper describes the tools and techniques being applied in the TINA Open Service Creation Architecture (TOSCA) project to develop objectoriented models of distributed telecommunication services in SDL. The paper also describes the way in which Tree and Tabular Combined Notation (TTCN) test cases are derived from these models and subsequently executed against the CORBA based implementations of these services through a TTCN/CORBA gateway.
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