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| 2. |
- Bilic, Damir
(författare)
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Managing Variability in SysML Models of Automotive Systems
- 2020
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Organizations developing software-intensive systems inevitably face increasing complexity of developed products, mainly due to rapid advancements in all domains of technology. Many such organizations are considering model-based systems engineering (MBSE) practices to cope with the increasing complexity. The use of models, as a central role during product design, promises to provide benefits such as enhanced communication among system stakeholders, continuous verification, improved design integrity, traceability between requirements and system artifacts and many more. Additionally, products are often built in many variants. That is especially obvious in the automotive domain, where customers have the ability to configure vehicles with hundreds of configuration options. To deal with the variability, a product line engineering approach is often used. It allows the development of a family of similar software-intensive systems that share a common base while being adapted to individual customer requirements.In this thesis, the overall goal is to evaluate and facilitate the combination of the two mentioned approaches, model-based systems engineering and product line engineering, in an industrial environment. To achieve the main thesis goal, it was divided into three separate research goals.The first goal was to identify challenges when applying an annotation-based approach for variant management in SysML models on a use case provided by Volvo Construction Equipment. The aim was to identify and understand challenges when using existing tool support to manage variants in implementation artifacts of existing products. The second research goal was to identify reuse-related challenges in the ``clone-and-own'' based development process of Volvo CE. Moreover, we assess the effects of model-based product line engineering on the identified challenges. Lastly, the third research goal was to develop an approach for consistency checking between variability- and SysML system models. To achieve that, we develop an integrated tool chain for model-based product line engineering that allows the integration of variable artifacts, which are not documented in system models, into the development process. Secondly, we define and develop an approach for consistency checking between variability models that describe the system in terms of features and implementation models that describe how variability is implemented in the product itself, since such support does not exist in current state of the art tools.In conclusion, based on the results from the results of case studies at Volvo CE, it was shown that model-based product line engineering has the potential to improve communication and highlight implications of variability to stakeholders (e.g. to non-technical staff), improve traceability between variability in requirements and variability in design and implementation, improve consistency through constraints between variants and automate repetitive activities.In other words, it shows potential for improving product quality while reducing the development lead time. However, the evaluation and measurement of improvement will be left for future work as measuring the product quality and lead time requires an organizational roll out of model-based product-line engineering.
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| 3. |
- Bilic, Damir, et al.
(författare)
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Model-Based Product Line Engineering in an Industrial Automotive Context: An Exploratory Case Study
- 2018
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Ingår i: 1st Intl. Workshop on Variability and Evolution of Software-intensive Systems VariVolution'18. - New York, NY, USA : ACM. ; , s. 56-63
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Konferensbidrag (refereegranskat)abstract
- Product Line Engineering is an approach to reuse assets of complex systems by taking advantage of commonalities between product families. Reuse within complex systems usually means reuse of artifacts from different engineering domains such as mechanical, electronics and software engineering. Model-based systems engineering is becoming a standard for systems engineering and collaboration within different domains. This paper presents an exploratory case study on initial efforts of adopting Product Line Engineering practices within the model-based systems engineering process at Volvo Construction Equipment (Volvo CE), Sweden. We have used SysML to create overloaded models of the engine systems at Volvo CE. The variability within the engine systems was captured by using the Orthogonal Variability Modeling language. The case study has shown us that overloaded SysML models tend to become complex even on small scale systems, which in turn makes scalability of the approach a major challenge. For successful reuse and to, possibly, tackle scalability, it is necessary to have a database of reusable assets from which product variants can be derived.
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| 4. |
- Bilic, Damir, et al.
(författare)
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Towards a Model-Driven Product Line Engineering Process : An Industrial Case Study
- 2020
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Ingår i: Proceedings of the 13th Innovations in Software Engineering Conference on Formerly Known as India Software Engineering Conference. - New York, NY, USA : Association for Computing Machinery.
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Konferensbidrag (refereegranskat)abstract
- Many organizations developing software-intensive systems face challenges with high product complexity and large numbers of variants. In order to effectively maintain and develop these product variants, Product-Line Engineering methods are often considered, while Model-based Systems Engineering practices are commonly utilized to tackle product complexity. In this paper, we report on an industrial case study concerning the ongoing adoption of Product Line Engineering in the Model-based Systems Engineering environment at Volvo Construction Equipment (Volvo CE) in Sweden. In the study, we identify and define a Product Line Engineering process that is aligned with Model-based Systems Engineering activities at the engines control department of Volvo CE. Furthermore, we discuss the implications of the migration from the current development process to a Model-based Product Line Engineering-oriented process. This process, and its implications, are derived by conducting and analyzing interviews with Volvo CE employees, inspecting artifacts and documents, and by means of participant observation. Based on the results of a first system model iteration, we were able to document how Model-based Systems Engineering and variability modeling will affect development activities, work products and stakeholders of the work products.
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| 5. |
- Brahneborg, Daniel, et al.
(författare)
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A Black-Box Approach to Latency and Throughput Analysis
- 2017
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Ingår i: Proceedings - 2017 IEEE International Conference on Software Quality, Reliability and Security Companion, QRS-C 2017. - 9781538620724 ; , s. 603-604
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Konferensbidrag (refereegranskat)abstract
- To enable fast and reliable delivery of mobile text messages (SMS), special bidirectional protocols are often used. Measuring the achieved throughput and involved latency is however non-trivial, due to the complexity of these protocols. Modifying an existing system would incur too much of a risk, so instead a new tool was created to analyse the log files containing information about this traffic in a black-box fashion. When the produced raw data was converted into graphs, they gave new insights into the behaviour of both the protocols and the remote systems involved.
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| 6. |
- Brahneborg, Daniel, et al.
(författare)
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A Pragmatic Perspective on Regression Testing Challenges
- 2017
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Ingår i: Proceedings - 2017 IEEE International Conference on Software Quality, Reliability and Security Companion, QRS-C 2017. - Prague, Czech Republic. - 9781538620724 ; , s. 618-619
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Konferensbidrag (refereegranskat)abstract
- Regression testing research has received significant focus during the past decades, acknowledging the benefits it can provide to organisations in terms of reduced development and maintenance costs, as well as sustained end-user satisfaction. There are several challenges left to overcome before the industry can fully take advantage of the available research results in this area. To get a better overview of how current regression testing research fits in with today’s industrial practices, we read a selection of papers in the field and based on our experience, critically examined their content. As a result, we present and discuss a taxonomy of regression testing challenges, from the perspectives of both methods and organisations, that we believe will foster the industrial uptake of regression testing.
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| 8. |
- Brahneborg, Daniel, 1970-, et al.
(författare)
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Round-Trip Time Anomaly Detection
- 2018
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Ingår i: ICPE '18 Proceedings of the 2018 ACM/SPEC International Conference on Performance Engineering. - New York, NY, USA : ACM. - 9781450350952 ; , s. 107-114
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Konferensbidrag (refereegranskat)abstract
- Mobile text messages (SMS) are sometimes used for authentication, which requires short and reliable delivery times. The observed round-trip times when sending an SMS message provide valuable information on the quality of the connection. In this industry paper, we propose a method for detecting round-trip time anomalies, where the exact distribution is unknown, the variance is several orders of magnitude, and there are lots of shorter spikes that should be ignored. In particular, we show that using an adaption of Double Seasonal Exponential Smoothing to reduce the content dependent variations, followed by the Remedian to find short-term and long-term medians, successfully identifies larger groups of outliers. As training data for our method we use log files from a live SMS gateway. In order to verify the effectiveness of our approach, we utilize simulated data. Our contributions are a description on how to isolate content dependent variations, and the sequence of steps to find significant anomalies in big data.
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| 9. |
- Brahneborg, Daniel, 1970-, et al.
(författare)
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Superlinear and Bandwidth Friendly Geo-replication for Store-And-Forward Systems
- 2020
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Ingår i: ICSOFT 2020 - Proceedings of the 15th International Conference on Software Technologies. - : SciTePress. - 9789897584435 ; , s. 328-338
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Konferensbidrag (refereegranskat)abstract
- To keep internet based services available despite inevitable local internet and power outages, their data must be replicated to one or more other sites. For most systems using the store-and-forward architecture, data loss can also be prevented by using end-to-end acknowledgements. So far we have not found any sufficiently good solutions for replication of data in store-and-forward systems without acknowledgements and with geographically separated system nodes. We therefore designed a new replication protocol, which could take advantage of the lack of a global order between the messages and the acceptance of a slightly higher risk for duplicated deliveries than existing protocols. We tested a proof-of-concept implementation of the protocol for throughput and latency in a controlled experiment using 7 nodes in 4 geographically separated areas, and observed the throughput increasing superlinearly with the number of nodes up to almost 3500 messages per second. It is also, to the best of our knowledge, the first replication protocol with a bandwidth usage that scales according to the number of nodes allowed to fail and not the total number of nodes in the system.
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| 10. |
- Brahneborg, Daniel, et al.
(författare)
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Towards a more reliable store-and-forward protocol for mobile text messages
- 2018
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Ingår i: Proceedings of the Annual ACM Symposium on Principles of Distributed Computing. - New York, NY, USA : Association for Computing Machinery. - 9781450357753 ; , s. 13-20
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Konferensbidrag (refereegranskat)abstract
- Businesses often use mobile text messages (SMS) as a cost effective and universal way of communicating concise information to their customers. Today, these messages are usually sent via SMS brokers, which forward them further to the next stakeholder, typically the various mobile operators, and then the messages eventually reach the intended recipients. Infoflex Connect AB delivers an SMS gateway application to the brokers with the main responsibility of reliable message delivery within set quality thresholds. However, the protocols used for SMS communication are not designed for reliability and thus messages may be lost. In this position paper we deduce requirements for a new protocol for routing messages through the SMS gateway application running at a set of broker nodes, in order to increase the reliability. The requirements cover important topics for the required communication protocol such as event ordering, message handling and system membership. The specification of such requirements sets the foundation for the forthcoming design and implementation of such a protocol and its evaluation.
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