This article discusses the methods of making 3D network model library suitable for long-distance education using VRML together with 3D SMAX, it also introduces the techniqu of programming and modifying with VRML langu...
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This article discusses the methods of making 3D network model library suitable for long-distance education using VRML together with 3D SMAX, it also introduces the techniqu of programming and modifying with VRML language.
Current software development tools let developers model a software system and generate program code from the models to run the system. However, generating code and installing a non-trivial system induces a time delay ...
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ISBN:
(纸本)1581133359
Current software development tools let developers model a software system and generate program code from the models to run the system. However, generating code and installing a non-trivial system induces a time delay between changing the model and executing it that makes rapid model prototyping awkard if not impossible. This paper presents the architecture of a virtual machine for UML that interprets UML models without any intermediate code-generation step. The paper shows how to embed UML in a metalevel architecture so that a key property of model-based systems, the casual connection between models and model instances, is guaranteed. With this architecture, changes to a model have immediate effects on its execution, providing users with rapid feedback about the model's structure and behavior. This approach supports model innovation better than today's code-generation approaches.
Modern pacemakers can be programmed to change their operating parameters even after implantation. The trend is towards custom microprocessor-based all digital, and fully programmable devices. In view of the present an...
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Modern pacemakers can be programmed to change their operating parameters even after implantation. The trend is towards custom microprocessor-based all digital, and fully programmable devices. In view of the present and anticipated future complexity and diversity of the pacemakers, a versatile programming technique was developed. The program code consists of 1 byte of check-sum or pacemaker ID. One or more bytes of op-code (mode of operation), 1 or more bytes of operand (data or parameters), and 1 byte for synchronization. The full range of program parameters such as the width and the rate, and all modes of operation such as asynchronous and demand. Due to the flexibility of this programming technique it is suitable for all present and possible future generations of programmable pacemakers.
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