Modeling and validating distributed embedded real-time systems with VDM++

Question

1. What are the contributions in "Modeling and validating distributed embedded real-time systems with vdm++" ?

2. What are the future works in "Modeling and validating distributed embedded real-time systems with vdm++" ?

3. What is the aim of this paper?

4. What language is used to define a labeled transition system?

Accepted Answer

The limitations of the current notation are discussed and new language elements are introduced to overcome these deficiencies.. The impact of these changes is illustrated by a case study.. The associated abstract formal semantics, which is not specific to VDM, is presented in this paper.. The proposed language extensions significantly reduce the modeling effort when describing distributed real-time systems in VDM++ and the revised semantics provides a basis for improved tool support.

Accepted Answer

These language extensions allows us to experiment with different deployment strategies at a very early stage in the design.. The authors believe that important system properties can be validated in a very cost-effective way if these features are implemented in VDMTools.. The authors believe that this is not true.

Accepted Answer

The aim of this paper is to make VDM++ better suited for describing distributed embedded real-time systems and to enable the design space exploration as mentioned before.

Accepted Answer

In [13] a labeled transition system has been defined using the algebraic specification language CASL, whereas [12] uses the specification language of the theorem prover PVS to formulate the semantics.

Accepted Answer

TMC messages arrive at the HandleTMC task where they are checked and forwarded to the DecodeTMC task to be translated into human readable text which is displayed on the screen by the UpdateTMC task.

Accepted Answer

A constructive operational semantics was defined for a language subset to prototype and validate the required improvements in the semantics.

Accepted Answer

When deployment is considered, it is essential to also be able to express time penalties that are relative to the capacity of the computation resource.

Accepted Answer

– q : ObjectId → queue[Thread × Operation] records for each object a FIFOqueue of incoming calls, together with the calling thread (needed for synchronous operations only).

Accepted Answer

The dynamic semantics of an executable subset of VDM++ is provided as a constructive operational semantics specified in VDM-SL which is roughly 500 pages including informal explanation [8].

Accepted Answer

3. The operation handleEvent is called by the system at the end of the UpdateTMC operation (not shown here),indicating that the event was completely processed by the ProcessTMC application.

Accepted Answer

The authors use the skip statement for illustration purposes here, it can be replaced with an arbitrary complex statement to describe the actual system function that is performed, for example changing the amplifier volume set point.

Accepted Answer

the authors propose the following changes:1. The semantics of timed VDM++ is based on the assumption that at most one thread can push time forward in the model.

Accepted Answer

Validation of this semantics is discussed in Sect. 4.3.The authors abstract from many aspects and constructs in VDM++ and assume given definitions of classes, including explicit definitions of synchronous and asynchronous operations.

Modeling and validating distributed embedded real-time systems with VDM++

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Most frequently asked questions

1. What are the contributions in "Modeling and validating distributed embedded real-time systems with vdm++" ?

2. What are the future works in "Modeling and validating distributed embedded real-time systems with vdm++" ?

3. What is the aim of this paper?

4. What language is used to define a labeled transition system?

5. What is the common way to handle TMC messages?

6. What is the purpose of the constructive operational semantics?

7. What is the importance of a time penalty in timed VDM++?

8. What is the q of the ObjectId queue?

9. What is the semantics of an executable subset of VDM++?

10. What is the way to handle an event?

11. What is the purpose of the skip statement?

12. What is the semantics of timed VDM++?

13. What is the semantics of the VDM++ system model?

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Citations

Vienna Development Method

Formal Verification of Object-Oriented Software : International Conference, FoVeOOS 2010, Paris, France, June 28-30, 2010, Revised Selected Papers

Formal modeling and analysis of resource management for cloud architectures: an industrial case study using Real-Time ABS

Formal Verification of Object-Oriented Software

The ABS tool suite: modelling, executing and analysing distributed adaptable object-oriented systems

References

System architecture evaluation using modular performance analysis: a case study

System Architecture Evaluation Using Modular Performance Analysis - A Case Study.

Analysing UML Active Classes and Associated State Machines - A Lightweight Formal Approach

Timed automata based analysis of embedded system architectures

An Executable Subset of Meta-IV with Loose Specification

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