| 1. |
- Beal, Jacob, et al.
(författare)
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Robust estimation of bacterial cell count from optical density
- 2020
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Ingår i: Communications Biology. - : Springer Science and Business Media LLC. - 2399-3642. ; 3:1
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Tidskriftsartikel (refereegranskat)abstract
- Optical density (OD) is widely used to estimate the density of cells in liquid culture, but cannot be compared between instruments without a standardized calibration protocol and is challenging to relate to actual cell count. We address this with an interlaboratory study comparing three simple, low-cost, and highly accessible OD calibration protocols across 244 laboratories, applied to eight strains of constitutive GFP-expressing E. coli. Based on our results, we recommend calibrating OD to estimated cell count using serial dilution of silica microspheres, which produces highly precise calibration (95.5% of residuals <1.2-fold), is easily assessed for quality control, also assesses instrument effective linear range, and can be combined with fluorescence calibration to obtain units of Molecules of Equivalent Fluorescein (MEFL) per cell, allowing direct comparison and data fusion with flow cytometry measurements: in our study, fluorescence per cell measurements showed only a 1.07-fold mean difference between plate reader and flow cytometry data.
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| 2. |
- Alégroth, Emil, et al.
(författare)
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Towards a mapping of software technical debt onto testware
- 2017
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Ingår i: Proceedings - 43rd Euromicro Conference on Software Engineering and Advanced Applications, SEAA 2017. - : Institute of Electrical and Electronics Engineers Inc.. - 9781538621400 ; , s. 404-411
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Konferensbidrag (refereegranskat)abstract
- Technical Debt (TD) is a metaphor used to explain the negative impacts that sub-optimal design decisions have in the long-term perspective of a software project. Although TD is acknowledged by both researchers and practitioners to have strong negative impact on Software development, its study on Testware has so far been very limited. A gap in knowledge that is important to address due to the growing popularity of Testware (scripted automated testing) in software development practice.In this paper we present a mapping analysis that connects 21 well-known, Software, object-oriented TD items to Testware, establishing them as Testware Technical Debt (TTD) items. The analysis indicates that most Software TD items are applicable or observable as TTD items, often in similar form and with roughly the same impact as for Software artifacts (e.g. reducing quality of the produced artifacts, lowering the effectiveness and efficiency of the development process whilst increasing costs). In the analysis, we also identify three types of connections between software TD and TTD items with varying levels of impact and criticality. Additionally, the study finds support for previous research results in which specific TTD items unique to Testware were identified. Finally, the paper outlines several areas of future research into TTD. © 2017 IEEE.
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| 3. |
- Aouachria, Moufida, et al.
(författare)
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Business Process Integration : How to Achieve Interoperability through Process Patterns
- 2017
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Ingår i: Proceedings - 14th IEEE International Conference on E-Business Engineering, ICEBE 2017 - Including 13th Workshop on Service-Oriented Applications, Integration and Collaboration, SOAIC 207. - : Institute of Electrical and Electronics Engineers Inc.. - 9781538614129 ; , s. 109-117
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Konferensbidrag (refereegranskat)abstract
- Business process integration (BPI) is a crucial technique for supporting inter-organizational business interoperability. BPI allows automation of business processes and the integration of systems across numerous organizations. The integration of organizations' process models is one of the most addressed and used approach to achieve BPI. However, this model integration is complex and requires that designers have extensive experience in particular when organizations' business processes are incompatible. This paper considers the issue of modeling cross-organization processes out of a collection of organizations' private process models. To this end, we propose six adaptation patterns to resolve incompatibilities when combining organizations' processes. Each pattern is formalized with workflow net. © 2017 IEEE.
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| 4. |
- Blal, Redouane, et al.
(författare)
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From inter-organizational business process models to service-oriented architecture models
- 2018
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Ingår i: Service Oriented Computing and Applications. - : Springer London. - 1863-2386 .- 1863-2394. ; 12:3-4, s. 227-245
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Tidskriftsartikel (refereegranskat)abstract
- Today’s business processes become increasingly complex and often cross the boundaries of the organizations. On the one hand, to support their business processes, modern organizations use enterprise information systems that need to be aware of the organizations’ processes and contexts. Such systems are called Process-Aware Information System (PAIS). On the other hand, the service-oriented architecture (SOA) is a fast emerging architectural style that has been widely adopted by modern organizations to design and implement PAIS that support their business processes. This paper aims to bridge the gap between inter-organizational business processes and SOA-based PAISs that support them. It proposes a novel model-driven design method that generates SOA models expressed in SoaML taking the specification of collaborative business processes expressed in BPMN as input. We present the principles underlying the approach, the state of an ongoing implementation, and the results of two studies conducted to empirically validate the method in the context of ERP key processes. © 2018, Springer-Verlag London Ltd., part of Springer Nature.
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| 5. |
- Chatzipetrou, Panagiota, 1984-, et al.
(författare)
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Approaching the Relative Estimation Concept with Planning Poker
- 2018
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Ingår i: CSERC '18 The 7th Computer Science Education Research Conference, Saint Petersburg, Russian Federation, October 10 - 12, 2018. - New York, NY, USA : ACM Digital Library. - 9781450366243 ; , s. 21-25
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Konferensbidrag (refereegranskat)abstract
- Simulation is a powerful instrument in the education process that can help students experience a reality context and understand complex concepts required to accomplish practitioners’ tasks. The present study aims to investigate the software engineering students’ perception about the usefulness of the Planning Poker technique in relation to their understanding of the relative estimation concept. We conducted a simulation exercise where students first estimated tasks applying the concepts of relative estimation based on the concepts explained in the lecture, and then to estimate tasks applying the Agile Planning Poker technique. To investigate the students’ perception, we used a survey at the end of each exercise. The preliminary results did not show statistical significance on the students’ confidence to estimate relatively the user stories. However, from the students’ comments and feedback, there are indications that students are more confident in using Agile Planning Poker when they are asked to estimate user stories. The study will be replicated in the near future to a different group of students with a different background, to have a better understanding and also identify possible flaws of the exercise.
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| 6. |
- de Carvalho, Renata M., et al.
(författare)
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On the analysis of CMMN expressiveness : revisiting workflow patterns
- 2016
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Ingår i: 2016 IEEE 20TH INTERNATIONAL ENTERPRISE DISTRIBUTED OBJECT COMPUTING WORKSHOP (EDOCW). - 9781467399333 ; , s. 54-61
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Konferensbidrag (refereegranskat)abstract
- Traditional business process modeling languages use an imperative style to specify all possible execution flows, leaving little flexibility to process operators. Such languages are appropriate for low-complexity, high-volume, mostly automated processes. However, they are inadequate for case management, which involves low-volume, high-complexity, knowledge-intensive work processes of today's knowledge workers. OMG's Case Management Model and Notation (CMMN), which uses a declarative style to specify constraints placed at a process execution, aims at addressing this need. To the extent that typical case management situations do include at least some measure of imperative control, it is legitimate to ask whether an analyst working exclusively in CMMN can comfortably model the range of behaviors s/he is likely to encounter. This paper aims at answering this question by trying to express the extensive collection of Workflow Patterns in CMMN. Unsurprisingly, our study shows that the workflow patterns fall into three categories: 1) the ones that are handled by CMMN basic constructs, 2) those that rely on CMMN's engine capabilities and 3) the ones that cannot be handled by current CMMN specification. A CMMN tool builder can propose patterns of the second category as companion modeling idioms, which can be translated behind the scenes into standard CMMN. The third category is problematic, however, since its support in CMMN tools will break model interoperability.
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| 7. |
- Frattini, Julian, 1995-, et al.
(författare)
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An initial theory to understand and manage requirements engineering debt in practice
- 2023
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Ingår i: Information and Software Technology. - : Elsevier. - 0950-5849 .- 1873-6025. ; 159
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Tidskriftsartikel (refereegranskat)abstract
- Context: Advances in technical debt research demonstrate the benefits of applying the financial debt metaphor to support decision-making in software development activities. Although decision-making during requirements engineering has significant consequences, the debt metaphor in requirements engineering is inadequately explored. Objective: We aim to conceptualize how the debt metaphor applies to requirements engineering by organizing concepts related to practitioners’ understanding and managing of requirements engineering debt (RED). Method: We conducted two in-depth expert interviews to identify key requirements engineering debt concepts and construct a survey instrument. We surveyed 69 practitioners worldwide regarding their perception of the concepts and developed an initial analytical theory. Results: We propose a RED theory that aligns key concepts from technical debt research but emphasizes the specific nature of requirements engineering. In particular, the theory consists of 23 falsifiable propositions derived from the literature, the interviews, and survey results. Conclusions: The concepts of requirements engineering debt are perceived to be similar to their technical debt counterpart. Nevertheless, measuring and tracking requirements engineering debt are immature in practice. Our proposed theory serves as the first guide toward further research in this area.
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| 8. |
- Gonzalez-Huerta, Javier, et al.
(författare)
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A Business Process Re-Engineering Approach to Transform BPMN Models to Software Artifacts
- 2017
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Ingår i: E-TECHNOLOGIES. - Cham : SPRINGER-VERLAG BERLIN. - 9783319590417 ; , s. 170-184
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Konferensbidrag (refereegranskat)abstract
- Business Process Model and Notation (BPMN) is becoming a de-facto standard for the specification of organizational business processes. In most cases, business processes are modeled in order to build software that may support or automate specific parts of those processes. In this work, we aim at refining BPMN models in order to automatically derive software analysis and design artifacts (e.g., UML Class Diagrams or Use Cases) from a given BPMN. These artifacts will be later on used to develop the software components (not necessarily services) automating or supporting business process activities. Our envisioned approach is based on a three-steps model transformation chain: (1) we refine the BPMN as-is model; (2) we apply process re-engineering and automation patterns to generate the BPMN to-be model; and (3) we use the resulting to-be BPMN model to derive analysis and design software artifacts. In this paper, we focus on the first two steps of the approach.
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| 9. |
- Ickin, Selim, et al.
(författare)
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Why do users install and delete apps? : A survey study
- 2017
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Ingår i: Lecture Notes in Business Information Processing. - Cham : Springer Verlag. - 9783319691909 ; , s. 186-191
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Konferensbidrag (refereegranskat)abstract
- Practitioners on the area of mobile application development usually rely on set of app-related success factors, the majority of which are directly related to their economical/business profit (e.g., number of downloads, or the in-app purchases revenue). However, gathering also the user-related success factors, that explain the reasons why users choose, download, and install apps as well as the user-related failure factors that explain the reasons why users delete apps, might help practitioners understand how to improve the market impact of their apps. The objectives were to: identify (i) the reasons why users choose and installing mobile apps from app stores; (ii) the reasons why users uninstall the apps. A questionnaire-based survey involving 121 users from 26 different countries was conducted. © Springer International Publishing AG 2017.
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| 10. |
- Leshob, Abderrahmane, et al.
(författare)
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A value-oriented approach to business process specialization : Principles, proof-of-concept, and validation
- 2017
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Ingår i: Journal of Systems and Software. - : Elsevier. - 0164-1212 .- 1873-1228. ; 127, s. 120-149
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Tidskriftsartikel (refereegranskat)abstract
- Organizations build information systems to support their business processes. Precise modeling of an organization's processes is a prerequisite for building information systems that support those processes. Our goal is to help business analysts produce detailed models of the business processes that best reflect the needs of their organizations. To this end, we propose to a) leverage the best practices in terms of a kernel of generic business processes, and b) provide analysts with tools to customize those processes by generating new process variants. We use business patterns from the Resource Event Agent ontology to identify variation points, and to codify the transformations inherent in the generation of the process variants. We developed a prototype process specialization tool using the Eclipse modeling ecosystem. We tested our approach on a set of processes from the Enterprise Resource Planning literature, and a set of variation points to assess the extent to which: 1) the identified variation points made sense, and 2) whether the generated variants made sense, from a business point of view. The results showed that 94.12% of the variation points made sense, and that 80.6% of the generated process variants corresponded to what the business process management specialists expected.
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