Predicting and Evaluating Software Model Growth in the Automotive Industry

The size of a software artifact influences the software quality and impacts the development process. In industry, when software size exceeds certain thresholds, memory errors accumulate and development tools might not be able to cope anymore, resulting in a lengthy program start up times, failing builds, or memory problems at unpredictable times. Thus, foreseeing critical growth in software modules meets a high demand in industrial practice. Predicting the time when the size grows to the level where maintenance is needed prevents unexpected efforts and helps to spot problematic artifacts before they become critical. Although the amount of prediction approaches in literature is vast, it is unclear how well they fit with prerequisites and expectations from practice. In this paper, we perform an industrial case study at an automotive manufacturer to explore applicability and usability of prediction approaches in practice. In a first step, we collect the most relevant prediction approaches from literature, including both, approaches using statistics and machine learning. Furthermore, we elicit expectations towards predictions from practitioners using a survey and stakeholder workshops. At the same time, we measure software size of 48 software artifacts by mining four years of revision history, resulting in 4,547 data points. In the last step, we assess the applicability of state-of-the-art prediction approaches using the collected data by systematically analyzing how well they fulfill the practitioners' expectations. Our main contribution is a comparison of commonly used prediction approaches in a real world industrial setting while considering stakeholder expectations. We show that the approaches provide significantly different results regarding prediction accuracy and that the statistical approaches fit our data best

Endothelin stimulates PDGF secretion in cultured human mesangial cells

Endothelin stimulates PDGF secretion in cultured human mesangial cells. Endothelin, a 17-DKa peptide originally described as a potent vasoconstrictor, also stimulates the release of important regulators of glomerular hemodynamics such as atrial natriuretic factor and renin. In the present study we investigated the role of endothelin in the release of another potent vasoconstrictor and mitogen of human mesangial cells, the platelet-derived growth factor. Endothelin stimulated PDGF release at 12 hours and the effect was sustained for 36 hours. This effect was associated with the enhanced induction of mRNAs encoding PDGF A-and B-chain. Endothelin also induced mitogenesis in human mesangial cells which was accompanied by activation of phospholipase C with increased inositol phosphate turnover. These data suggest a mechanism by which endothelin may regulate mesangial cell function in disease states

Architecture evaluation in continuous development

Context: In automotive, stage-gate processes have previously been the norm, with architecture created mainly during an early phase and then used to guide subsequent development phases. Current iterative and Agile development methods, where the implementation evolves continuously, changes the role of architecture. Objective: We investigate how architecture evaluation can provide useful feedback during development of continuously evolving systems. Method: Starting from the Architecture Tradeoff Analysis Method (ATAM), we performed architecture evaluation, both in a national research project led by an automotive Original Equipment Manufacturer (OEM), and at the OEM, in the context of continuous development. This allows us to include the experience of several architects from different organizations over several years. Using data produced during the evaluations we perform a post-hoc analysis to derive initial findings. We then validate and refine these findings through a series of focus groups with architects and industry experts. Findings: We propose principles of continuous evaluation and evolution of architecture, and based on these discuss a roadmap for future research. Conclusion: In iterative development settings, the needs are different from what typical architecture evaluation methods provide. Our principles show the importance of dedicated feedback-loops for continuous evolution of systems and their architecture

Facing Forward, Looking Back: Religion and Film Studies in the Last Decade

On November 17, 2012, at the American Academy of Religion’s National Meeting, the Religion, Film, and Visual Culture Group sponsored a session entitled, “Facing Forward, Looking Back: Religion and Film Studies in the Last Decade.” The session focused on four recent books in the field of Religion and Film: John Lyden’s Film as Religion: Myths, Morals and Rituals (NYU, 2003); S. Brent Plate’s Religion and Film: Cinema and the Re-Creation of the World (Wallflower Press, 2009); Antonio Sison’s World Cinema, Theology, and the Human: Humanity in Deep Focus (Routledge, 2012); and Sheila Nayar’s The Sacred and the Cinema: Reconfiguring the ‘Genuinely’ Religious Film (Continuum, 2012). Each author was present to make remarks on his or her book, and then three respondents made remarks on each of the books as well. The respondents were Stefanie Knauss, Rachel Wagner, and Jolyon Thomas. Joe Kickasola introduced the session, and moderated the discussion that followed. This session represented a rare opportunity for scholars of the field of Religion and Film to reflect on the past, present, and future directions of the field, and the Journal of Religion and Film is happy to be able to include the remarks of all the presenters here

How do practitioners perceive the relevance of requirements engineering research? An ongoing study

The relevance of Requirements Engineering (RE) research to practitioners is a prerequisite for problem-driven research in the area and key for a long-term dissemination of research results to everyday practice. To understand better how industry practitioners perceive the practical relevance of RE research, we have initiated the RE-Pract project, an international collaboration conducting an empirical study. This project opts for a replication of previous work done in two different domains and relies on survey research. To this end, we have designed a survey to be sent to several hundred industry practitioners at various companies around the world and ask them to rate their perceived practical relevance of the research described in a sample of 418 RE papers published between 2010 and 2015 at the RE, ICSE, FSE, ESEC/FSE, ESEM and REFSQ conferences. In this paper, we summarize our research protocol and present the current status of our study and the planned future steps.Peer ReviewedPostprint (author's final draft

GaMin’11 – an International Inter-laboratory Comparison for Geochemical CO2 - Saline Fluid - Mineral Interaction Experiments

Due to the strong interest in geochemical CO2-fluid-rock interaction in the context of geological storage of CO2 a growing number of research groups have used a variety of different experimental ways to identify important geochemical dissolution or precipitation reactions and – if possible – quantify the rates and extent of mineral or rock alteration. In this inter-laboratory comparison the gas-fluid-mineral reactions of three samples of rock-forming minerals have been investigated by 11 experimental labs. The reported results point to robust identification of the major processes in the experiments by most groups. The dissolution rates derived from the changes in composition of the aqueous phase are consistent overall, but the variation could be reduced by using similar corrections for changing parameters in the reaction cells over time. The comparison of experimental setups and procedures as well as of data corrections identified potential improvements for future gas-fluid-rock studies

A Collaborative Requirement Mining Framework to Support OEMs

With the fastidiously ever-increasing complexity of systems, the relentless, massive customisation of products and the mushrooming accumulation of legal documents (standards, policies and laws), we can observe a significant increase in requirements. We consider the tremendous volume of requirements as big data with which companies struggle to make strategic decisions early on. This paper proposes a collaborative requirement mining framework to enable the decision-makers of an Original Equipment Manufacturer (OEM) to gain insight and discover opportunities in a massive set of requirements so as to make early effective strategic decisions. The framework supports OEMs willing to uncover a subset of key requirements by distilling large unstructured and semistructured specifications.Keonys, Toulouse, Franc

Archaeology, Hydrogeology and Geomythology in the Stymphalos Valley

This paper uses the results of recent excavations of the city of Stymphalos and environmental studies on the floor of the Stymphalos polje to examine the role of both the lake and springs in the history of the classical city. Associated with Artemis and famed for Herakles' sixth labour (killing of the Stymphalian birds), the city has a rich (geo)mythology. While this narrative has been associated solely with the lake, it is argued here that this geomythology was part of the city's relationship to environmental unpredictability and the relationship between water supply and water loss. Seen in this context, the construction of the fountain-house above the contemporary lakeshore is symbolic of the importance of springs to the foundation and sustainability of the classical city during both the Greek and Roman Periods. Through these archaeological and environmental analyses, we seek to illustrate the complimentary, but complex nature of archaeological, hydrogeological and palaeoenvironmental data that intersect in the geomythological landscapes of Mediterranean antiquity