All Outputs (71)

Model-based dependability analysis : state-of-the-art, challenges and future outlook (2015)
Book Chapter
Sharvia, S., Kabir, S., Walker, M., & Papadopoulos, Y. (2015). Model-based dependability analysis : state-of-the-art, challenges and future outlook. In I. Mistrik, N. Ali, B. Tekinerdogan, R. Soley, & J. Grundy (Eds.), Software Quality Assurance: In Large Scale and Complex Software-intensive Systems (251-278). Elsevier. https://doi.org/10.1016/B978-0-12-802301-3.00012-0

Abstract: Over the past two decades, the study of model-based dependability analysis has gathered significant research interest. Different approaches have been developed to automate and address various limitations of classical dependability technique... Read More about Model-based dependability analysis : state-of-the-art, challenges and future outlook.

Model transformation for multi-objective architecture optimisation of dependable systems (2015)
Journal Article
Mian, Z., Bottaci, L., Papadopoulos, Y., Sharvia, S., & Mahmud, N. (2015). Model transformation for multi-objective architecture optimisation of dependable systems. Advances in Intelligent Systems and Computing, 307, 91-110. https://doi.org/10.1007/978-3-319-08964-5_6

The promise of model-based engineering is that by use of an integrated and coherent system model both functional and non-functional requirements may be analysed, implemented and tested in a rigorous and cost-effective manner. An important part of mod... Read More about Model transformation for multi-objective architecture optimisation of dependable systems.

Reliability analysis of dynamic systems by translating temporal fault trees into Bayesian networks (2014)
Book Chapter
Kabir, S., Walker, M., & Papadopoulos, Y. (2014). Reliability analysis of dynamic systems by translating temporal fault trees into Bayesian networks. In Model-Based Safety and Assessment; Lecture Notes in Computer Science (96-109). Springer Verlag. https://doi.org/10.1007/978-3-319-12214-4_8

Classical combinatorial fault trees can be used to assess combinations of failures but are unable to capture sequences of faults, which are important in complex dynamic systems. A number of proposed techniques extend fault tree analysis for dynamic s... Read More about Reliability analysis of dynamic systems by translating temporal fault trees into Bayesian networks.

Integrating model checking with HiP-HOPS in model-based safety analysis (2014)
Journal Article
Sharvia, S., & Papadopoulos, Y. (2015). Integrating model checking with HiP-HOPS in model-based safety analysis. Reliability Engineering and System Safety, 135(March), 64-80. https://doi.org/10.1016/j.ress.2014.10.025

The ability to perform an effective and robust safety analysis on the design of modern safety–critical systems is crucial. Model-based safety analysis (MBSA) has been introduced in recent years to support the assessment of complex system design by fo... Read More about Integrating model checking with HiP-HOPS in model-based safety analysis.

An approach to safety analysis of clinical workflows (2014)
Journal Article
Al-Qora'n, L., Gordon, N., Sharvia, S., Walker, M., & Papadopoulos, Y. (2014). An approach to safety analysis of clinical workflows. Athens Journal of Health, 1(3), 201-216. https://doi.org/10.30958/ajh.1-3-4

A clinical workflow considers the information and processes that are involved in providing a clinical service. They are safety critical since even minor faults have the potential to propagate and consequently cause harm to a patient, or even for a pa... Read More about An approach to safety analysis of clinical workflows.

Enhancing the EAST-ADL error model with HiP-HOPS semantics (2014)
Journal Article
Sharvia, S., Papadopoulos, Y., Chen, D.-J., Walker, M., Yuan, W., & Lönn, H. (2014). Enhancing the EAST-ADL error model with HiP-HOPS semantics. Athens journal of technology & engineering, 1(2), 119-136

EAST-ADL is a domain-specific modelling language for the engineering of automotive embedded systems. The language has abstractions that enable engineers to capture a variety of information about design in the course of the lifecycle — from requiremen... Read More about Enhancing the EAST-ADL error model with HiP-HOPS semantics.

Using simulation to evaluate dynamic systems with weibull or lognormal distributions (2014)
Presentation / Conference Contribution
Edifor, E., Gordon, N., Walker, M., & Papadopoulos, Y. Using simulation to evaluate dynamic systems with weibull or lognormal distributions. Presented at Ninth International Conference on Dependability and Complex Systems DepCoS-RELCOMEX, Brunów, Poland

© Springer International Publishing Switzerland 2014. Most techniques for quantitatively analysing the temporal fault trees of safety-critical systems are used with the assumption that the systems under study have exponentially distributed component... Read More about Using simulation to evaluate dynamic systems with weibull or lognormal distributions.

Exploring the impact of different cost heuristics in the allocation of safety integrity levels (2014)
Journal Article
Azevedo, L. S., Parker, D., Papadopoulos, Y., Walker, M., Sorokos, I., & Araújo, R. E. (2014). Exploring the impact of different cost heuristics in the allocation of safety integrity levels. Lecture notes in computer science, 8822, 70-81. https://doi.org/10.1007/978-3-319-12214-4_6

Contemporary safety standards prescribe processes in which system safety requirements, captured early and expressed in the form of Safety Integrity Levels (SILs), are iteratively allocated to architectural elements. Different SILs reflect different r... Read More about Exploring the impact of different cost heuristics in the allocation of safety integrity levels.

Automatic optimisation of system architectures using EAST-ADL (2013)
Journal Article
Walker, M., Reiser, M.-O., Tucci-Piergiovanni, S., Papadopoulos, Y., Lönn, H., Mraidha, C., Parker, D., Chen, D., & Servat, D. (2013). Automatic optimisation of system architectures using EAST-ADL. Journal of Systems and Software, 86(10), 2467-2487. https://doi.org/10.1016/j.jss.2013.04.001

There are many challenges which face designers of complex system architectures, particularly safety-critical or real-time systems. The introduction of Architecture Description Languages (ADLs) has helped to meet these challenges by consolidating info... Read More about Automatic optimisation of system architectures using EAST-ADL.

Assisted assignment of automotive safety requirements (2013)
Journal Article
Azevedo, L. D. S., Parker, D., Walker, M., Papadopoulos, Y., & Araújo, R. E. (2014). Assisted assignment of automotive safety requirements. IEEE Software, 31(1), 62-68. https://doi.org/10.1109/ms.2013.118

ISO 26262, a functional-safety standard, uses Automotive Safety Integrity Levels (ASILs) to assign safety requirements to automotive-system elements. System designers initially assign ASILs to system-level hazards and then allocate them to elements o... Read More about Assisted assignment of automotive safety requirements.

Safety Analysis of a Remote Patient Monitoring System with a Guideline Based Decision Support (2013)
Book Chapter
Al-Qora'n, L., Sharvia, S., Papadopoulos, Y., & Gordon, N. (2013). Safety Analysis of a Remote Patient Monitoring System with a Guideline Based Decision Support. In Global Telemedicine and eHealth Updates: Knowledge Resources (527 - 531). International Society for Telemedicine & eHealth

Home Telehealth systems are used to help in the management of chronic conditions by patients themselves. Effective safety analysis tools are needed to ensure reliability and safety of these high risk systems. We hereby explain how Hierarchically-Perf... Read More about Safety Analysis of a Remote Patient Monitoring System with a Guideline Based Decision Support.

System dependability modelling and analysis using AADL and HiP-HOPS (2012)
Presentation / Conference Contribution
Mian, Z., Bottaci, L., Papadopoulos, Y., & Biehl, M. (2012). System dependability modelling and analysis using AADL and HiP-HOPS. IFAC Proceedings Volumes/ International Federation of Automatic Control, 45(6), 1647-1652. https://doi.org/10.3182/20120523-3-RO-2023.00334

The Architecture Analysis and Design Language (AADL) is gaining widespread acceptance in aerospace, automobile and avionics industries for designing dependability-critical systems. The design process of dependable systems must address both cost and d... Read More about System dependability modelling and analysis using AADL and HiP-HOPS.

Compositional synthesis of temporal fault trees from state machines (2012)
Journal Article
Papadopoulos, Y., Walker, M., & Mahmud, N. (2012). Compositional synthesis of temporal fault trees from state machines. Performance Evaluation Review, 39(4), 79-88. https://doi.org/10.1145/2185395.2185444

Dependability analysis of a dynamic system which is embedded with several complex interrelated components raises two main problems. First, it is difficult to represent in a single coherent and complete picture how the system and its constituent parts... Read More about Compositional synthesis of temporal fault trees from state machines.

Integrated application of compositional and behavioural safety analysis (2011)
Book Chapter
Sharvia, S., & Papadopoulos, Y. (2011). Integrated application of compositional and behavioural safety analysis. In W. Zamojski, J. Kacprzyk, J. Mazurkiewicz, J. Sugier, & T. Walkowiak (Eds.), Dependable Computer Systems (179-192). Springer. https://doi.org/10.1007/978-3-642-21393-9_14

The design complexity of modern safety critical systems presents various challenges for its safety assessment process. In recent years, Model-Based Safety Analysis (MBSA) has been proposed to achieve more-robust and effective safety assessment techni... Read More about Integrated application of compositional and behavioural safety analysis.

Integrated safety and architecture modeling for automotive embedded systems (2011)
Journal Article
Chen, D., Johansson, R., Lönn, H., Blom, H., Walker, M., Papadopoulos, Y., Torchiaro, S., Tagliabo, F., & Sandberg, A. (2011). Integrated safety and architecture modeling for automotive embedded systems. Elektrotechnik und Informationstechnik : E & I, 128(6), 196-202. https://doi.org/10.1007/s00502-011-0007-7

EAST-ADL is an architecture description language (ADL) for model-based development of automotive embedded systems. The formalization of domain-specific engineering information and methodology brings a potential for a wide range of benefits for inform... Read More about Integrated safety and architecture modeling for automotive embedded systems.

An approach to optimization of fault tolerant architectures using HiP-HOPS (2011)
Journal Article
Adachi, M., Papadopoulos, Y., Sharvia, S., Parker, D., & Tohdo, T. (2011). An approach to optimization of fault tolerant architectures using HiP-HOPS. Software: Practice and Experience, 41(11), 1303-1327. https://doi.org/10.1002/spe.1044

New processes for the design of dependable systems must address both cost and dependability concerns. They should also maximize the potential for automation to address the problem of increasing technological complexity and the potentially immense des... Read More about An approach to optimization of fault tolerant architectures using HiP-HOPS.

A hierarchical method for the reduction of temporal expressions in Pandora (2010)
Presentation / Conference Contribution
Papadopoulos, Y., & Walker, M. A hierarchical method for the reduction of temporal expressions in Pandora. Presented at Proceedings of the First Workshop on DYnamic Aspects in DEpendability Models for Fault-Tolerant Systems - DYADEM-FTS '10

Fault Tree Analysis (FTA) is a popular safety analysis technique used to determine the logical combination of events needed to cause a particular system failure. However, FTA is purely combinatorial and cannot analyse the effects of sequences of even... Read More about A hierarchical method for the reduction of temporal expressions in Pandora.

Automatic allocation of safety integrity levels (2010)
Presentation / Conference Contribution
Papadopoulos, Y., Walker, M., Reiser, M.-O., Weber, M., Chen, D., Törngren, M., Servat, D., Abele, A., Stappert, F., Lonn, H., Berntsson, L., Johansson, R., Tagliabo, F., Torchiaro, S., & Sandberg, A. (2010, April). Automatic allocation of safety integrity levels. Presented at Proceedings of the 1st Workshop on Critical Automotive applications Robustness & Safety - CARS '10

In this paper, we describe a concept for the automatic allocationof general Safety Integrity Levels (SILs) to subsystems andcomponents of complex hierarchical networked architectures thatdeliver sets of safety critical functions. The concept is gener... Read More about Automatic allocation of safety integrity levels.

Dynamic effect of perfect preventive maintenance on system reliability and cost using HiP-HOPS (2010)
Presentation / Conference Contribution
Nggada, S. H., Parker, D. J., & Papadopoulos, Y. I. Dynamic effect of perfect preventive maintenance on system reliability and cost using HiP-HOPS

The occurrence of failure in a safety critical engineering system can be reduced through the use of preventive maintenance (PM). Each time a component of the system is maintained its effective age is reduced; the extent of this age reduction depends... Read More about Dynamic effect of perfect preventive maintenance on system reliability and cost using HiP-HOPS.

Capture and reuse of composable failure patterns (2010)
Journal Article
Wolforth, I., Walker, M., Papadopoulos, Y., & Grunske, L. (2010). Capture and reuse of composable failure patterns. International Journal of Critical Computer-Based Systems, 1(1/2/3), 128-147. https://doi.org/10.1504/IJCCBS.2010.031710

Emerging safety analysis techniques use composition of failure models or fault simulation in formal models of a system to determine relationships between the causes and effects of failure. Most recent work has focused on developing system modelling a... Read More about Capture and reuse of composable failure patterns.