Computer Science

Computer Science ›› 2019, Vol. 46 ›› Issue (8): 217-223.doi: 10.11896/j.issn.1002-137X.2019.08.036

• Software & Database Technology • Previous Articles     Next Articles

Embedded Software Reliability Model and Evaluation Method Combining AADL and Z

LI Mi, ZHUANG Yi, HU Xin-wen   

  1. (College of Computer Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
  • Received:2018-07-06 Online:2019-08-15 Published:2019-08-15

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Abstract: In the early stage of embedded software development,a reliability model is established for it to discover problems in software design as early as possible,thereby saving embedded software development costs.AADL establishes software reliability model from two aspects of software structure and fault propagation.However,the semi-formal nature of AADL makes it difficult to analyze and verify the non-functional attributes such as reliability and security.The formal specification language Z language has a strong logical description ability and can accurately express various constraints in the software,which makes the reliability model based on the Z language well rigorously analyzed and verified.Therefore,considering the characteristics of AADL and Z,an embedded software reliability model combined with Z and AADL (ZARM) was proposed.The modeling methods of ZARM fault model,structure model and behavior model were given,and the data constraints related to reliability were described in the predicate.Based on the ZARM model,a probabilistic DTMC-based reliability evaluation method was proposed to quantitatively evaluate and analyze the ZARM model.Finally,the process of reliability modeling using ZARM model was described by a flight management system (FMS),and the reliability evaluation was carried out by using the proposed evaluation method.The comparison between the evaluation results and the reference [19] results shows the correctness and effectiveness of the proposed method.

Key words: Embedded software, Reliability, AADL, Z language, DTMC

CLC Number: 

  • TP311.5
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