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Variability management in safety-critical systems design & dependability analysis (2019)
Journal Article
De Oliveira, A., Braga, R., Masiero, P., Parker, D., Papadopoulos, Y., Habli, I., & Kelly, T. (in press). Variability management in safety-critical systems design & dependability analysis. Journal of software : evolution and process,

Safety-critical systems are of paramount importance for many application domains where safety properties are a key driver to engineer critical aspects and avoid system failures. However, the integration of safety analyses in the development process i... Read More

Infinite Virtual Stoa (2018)
Conference Proceeding
Torrao, L., Papadopoulos, Y., & Mckie, D. (2018). Infinite Virtual Stoa. In XXI GENERATIVE ART 2018, proceedings of XXI Generative Art conference, 183-194

Stoicism is a philosophy that considers the object of life to be ataraxia (αταραξία), a state of psychological stability which is undisturbed by exposure to phenomena and circumstances that lie outside one's control. Such circumstances may include il... Read More

Timaeus: A digital art studio inspired by antiquity (2018)
Journal Article
Torrao, L., Papadopoulos, Y., & Mckie, D. (2018). Timaeus: A digital art studio inspired by antiquity. Generative art science and technology hard journal,

This project was motivated as an exploration of the capabilities provided by new digital media for creativity, art creation and art therapy. In the ancient Greek world, téchnē, the word for art, used to refer to both art and technology. The expressio... Read More

A Study of Automatic Allocation of Automotive Safety Requirements in Two Modes: Components and Failure Modes (2018)
Journal Article
Parker, D., Godof, A., Papadopoulos, Y., & Saintis, L. (2018). A Study of Automatic Allocation of Automotive Safety Requirements in Two Modes: Components and Failure Modes. SAE Technical Papers, 2018-April, https://doi.org/10.4271/2018-01-1076

ISO 26262 describes a safety engineering approach in which the safety of a system is considered from the early stages of design through a process of elicitation and allocation of system safety requirements. These are expressed as automotive safety in... Read More

A model-based extension to HiP-HOPS for dynamic fault propagation studies (2017)
Journal Article
Kabir, S., Papadopoulos, Y., Walker, M., Parker, D., Aizpurua, J. I., Lampe, J., & Rüde, E. (2017). A model-based extension to HiP-HOPS for dynamic fault propagation studies. Lecture notes in computer science, 10437 LNCS, 163-178. https://doi.org/10.1007/978-3-319-64119-5_11

HiP-HOPS is a model-based approach for assessing the dependability of safety-critical systems. The method combines models, logic, probabilities and nature-inspired algorithms to provide advanced capabilities for design optimisation, requirement alloc... Read More

Improved dynamic dependability assessment through integration with prognostics (2017)
Journal Article
Aizpurua, J. I., Catterson, V. M., Papadopoulos, Y., Chiacchio, F., & Manno, G. (2017). Improved dynamic dependability assessment through integration with prognostics. IEEE Transactions on Reliability, 66(3), 893-913. https://doi.org/10.1109/tr.2017.2693821

The use of average data for dependability assessments results in a outdated system-level dependability estimation which can lead to incorrect design decisions. With increasing availability of online data, there is room to improve traditional dependab... Read More

On cost-effective reuse of components in the design of complex reconfigurable systems (2017)
Journal Article
Aizpurua, J. I., Papadopoulos, Y., Muxika, E., Chiacchio, F., & Manno, G. (2017). On cost-effective reuse of components in the design of complex reconfigurable systems. Quality and Reliability Engineering International, 33(7), 1387-1406. https://doi.org/10.1002/qre.2112

Design strategies that benefit from the reuse of system components can reduce costs while maintaining or increasing dependability—we use the term dependability to tie together reliability and availability. D3H2 (aDaptive Dependable Design for systems... Read More

Fuzzy temporal fault tree analysis of dynamic systems (2016)
Journal Article
Kabir, S., Papadopoulos, Y., Walker, M., Rüde, E., & Securius, P. (2016). Fuzzy temporal fault tree analysis of dynamic systems. International Journal of Approximate Reasoning, 77, 20-37. https://doi.org/10.1016/j.ijar.2016.05.006

Fault tree analysis (FTA) is a powerful technique that is widely used for evaluating system safety and reliability. It can be used to assess the effects of combinations of failures on system behaviour but is unable to capture sequence dependent dynam... Read More

Quantitative evaluation of Pandora Temporal Fault Trees via Petri Nets (2015)
Journal Article
Kabir, S., Papadopoulos, Y., & Walker, M. (2015). Quantitative evaluation of Pandora Temporal Fault Trees via Petri Nets. IFAC postprint volumes IPPV / International Federation of Automatic Control, 48(21), 458-463. https://doi.org/10.1016/j.ifacol.2015.09.569

© 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved. Using classical combinatorial fault trees, analysts are able to assess the effects of combinations of failures on system behaviour but are unab... Read More

Automatic allocation of safety requirements to components of a software product line (2015)
Journal Article
De Oliveira, A. L., Papadopoulos, Y., Azevedo, L. S., Parker, D., Braga, R. T., Masiero, P. C., …Kelly, T. (2015). Automatic allocation of safety requirements to components of a software product line. IFAC postprint volumes IPPV / International Federation of Automatic Control, 48(21), 1309-1314. https://doi.org/10.1016/j.ifacol.2015.09.706

Safety critical systems developed as part of a product line must still comply with safety standards. Standards use the concept of Safety Integrity Levels (SILs) to drive the assignment of system safety requirements to components of a system under des... Read More

Automating allocation of development assurance levels: An extension to HiP-HOPS (2015)
Journal Article
Sorokos, I., Papadopoulos, Y., Azevedo, L., Parker, D., & Walker, M. (2015). Automating allocation of development assurance levels: An extension to HiP-HOPS. IFAC postprint volumes IPPV / International Federation of Automatic Control, 48(7), 9-14. https://doi.org/10.1016/j.ifacol.2015.06.466

Controlling the allocation of safety requirements across a system's architecture from the early stages of development is an aspiration embodied in numerous major safety standards. Manual approaches of applying this process in practice are ineffective... Read More

A synthesis of logic and biology in the design of dependable systems (2015)
Journal Article
Papadopoulos, Y. (2015). A synthesis of logic and biology in the design of dependable systems. IFAC postprint volumes IPPV / International Federation of Automatic Control, 28(7), 1-8. https://doi.org/10.1016/j.ifacol.2015.06.465

The technologies of model-based design and dependability analysis in the design of dependable systems, including software intensive systems, have advanced in recent years. Much of this development can be attributed to the application of advances in f... Read More

Supporting the automated generation of modular product line safety cases (2015)
Book Chapter
de Oliveira, A. L., Braga, R. T., Masiero, P. C., Papadopoulos, Y., Habli, I., & Kelly, T. (2015). Supporting the automated generation of modular product line safety cases. In W. Zamojski, J. Mazurkiewicz, J. Sugier, T. Walkowiak, & J. Kacprzyk (Eds.), Advances in Intelligent Systems and Computing; Theory and Engineering of Complex Systems and Dependability, 319-330. Springer Verlag. doi:10.1007/978-3-319-19216-1_30

Abstract The effective reuse of design assets in safety-critical Software Product Lines (SPL) would require the reuse of safety analyses of those assets in the variant contexts of certification of products derived from the SPL. This in turn requires... Read More

Model-based dependability analysis : state-of-the-art, challenges and future outlook (2015)
Book Chapter
Kabir, S., Papadopoulos, Y., Sharvia, S., & Walker, M. (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

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

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

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

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

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. doi: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

Integrated safety and architecture modeling for automotive embedded systems (2011)
Journal Article
Chen, D., Johansson, R., Lönn, H., Blom, H., Walker, M., Papadopoulos, Y., …Sandberg, A. (2011). Integrated safety and architecture modeling for automotive embedded systems. Elektrotechnik und Informationstechnik : E & I, 128(6), (196-202). doi:10.1007/s00502-011-0007-7. ISSN 0932-383X

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