Research output: Contribution to journal › Article › peer-review
Deriving specifications of control programs for cyber physical systems. / Burns, Alan; Hayes, Ian; Jones, Cliff.
In: Computer journal, 30.04.2019.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Deriving specifications of control programs for cyber physical systems
AU - Burns, Alan
AU - Hayes, Ian
AU - Jones, Cliff
N1 - © The British Computer Society 2019. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.
PY - 2019/4/30
Y1 - 2019/4/30
N2 - Cyber Physical Systems (CPS) exist in a physical environment andcomprise both physical components and a control program.Physical components are inherentlyliable to failure and yet an overall CPS is required to operate safely, reliably and costeffectively. This paper proposes a framework for deriving the specificationof the software control component of a CPS from an understanding of the behaviour requiredof the overall system in its physical environment.The two key elements of thisframework are (i) an extension to the use of rely/guarantee conditions toallow specifications to be obtained systematicallyfrom requirements (as expressed in terms of the required behaviour in the environment)and nested assumptions (about the physical components of the CPS); and (ii) the use oftime bands to record the temporal properties required of the CPS at a number of differentgranularities.The key contribution is in combining these ideas;using time bands overcomes a significant drawback in earlier work.The paper also addresses the means by which the reliability ofa CPS can be addressed by challenging each rely condition in the derived specificationand, where appropriate, improve robustness and/or define weaker guarantees thatcan be delivered with respect to the corresponding weaker rely conditions.
AB - Cyber Physical Systems (CPS) exist in a physical environment andcomprise both physical components and a control program.Physical components are inherentlyliable to failure and yet an overall CPS is required to operate safely, reliably and costeffectively. This paper proposes a framework for deriving the specificationof the software control component of a CPS from an understanding of the behaviour requiredof the overall system in its physical environment.The two key elements of thisframework are (i) an extension to the use of rely/guarantee conditions toallow specifications to be obtained systematicallyfrom requirements (as expressed in terms of the required behaviour in the environment)and nested assumptions (about the physical components of the CPS); and (ii) the use oftime bands to record the temporal properties required of the CPS at a number of differentgranularities.The key contribution is in combining these ideas;using time bands overcomes a significant drawback in earlier work.The paper also addresses the means by which the reliability ofa CPS can be addressed by challenging each rely condition in the derived specificationand, where appropriate, improve robustness and/or define weaker guarantees thatcan be delivered with respect to the corresponding weaker rely conditions.
U2 - 10.1093/comjnl/bxz019
DO - 10.1093/comjnl/bxz019
M3 - Article
JO - Computer journal
JF - Computer journal
SN - 0010-4620
ER -