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See detailMany Independent Objective (MIO) Algorithm for Test Suite Generation
Arcuri, Andrea UL

in Symposium on Search-Based Software Engineering (SSBSE) (in press)

Automatically generating test suites is intrinsically a multi- objective problem, as any of the testing targets (e.g, statements to exe- cute or mutants to kill) is an objective on its own. Test suite ... [more ▼]

Automatically generating test suites is intrinsically a multi- objective problem, as any of the testing targets (e.g, statements to exe- cute or mutants to kill) is an objective on its own. Test suite generation has peculiarities that are quite di erent from other more regular optimi- sation problems. For example, given an existing test suite, one can add more tests to cover the remaining objectives. One would like the smallest number of small tests to cover as many objectives as possible, but that is a secondary goal compared to covering those targets in the rst place. Furthermore, the amount of objectives in software testing can quickly become unmanageable, in the order of (tens/hundreds of) thousands, es- pecially for system testing of industrial size systems. Traditional multi- objective optimisation algorithms can already start to struggle with just four or ve objectives to optimize. To overcome these issues, di erent techniques have been proposed, like for example the Whole Test Suite (WTS) approach and the Many-Objective Sorting Algorithm (MOSA). However, those techniques might not scale well to very large numbers of objectives and limited search budgets (a typical case in system test- ing). In this paper, we propose a novel algorithm, called Many Indepen- dent Objective (MIO) algorithm. This algorithm is designed and tailored based on the speci c properties of test suite generation. An empirical study, on a set of arti cial and actual software, shows that the MIO al- gorithm can achieve higher coverage compared to WTS and MOSA, as it can better exploit the peculiarities of test suite generation. [less ▲]

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See detailAn Empirical Evaluation of Evolutionary Algorithms for Test Suite Generation
Campos, Jose; Ge, Yan; Fraser, Gordon et al

in Symposium on Search-Based Software Engineering (SSBSE) (in press)

Evolutionary algorithms have been shown to be effective at generating unit test suites optimised for code coverage. While many aspects of these algorithms have been evaluated in detail (e.g., test length ... [more ▼]

Evolutionary algorithms have been shown to be effective at generating unit test suites optimised for code coverage. While many aspects of these algorithms have been evaluated in detail (e.g., test length and different kinds of techniques aimed at improving performance, like seeding), the influence of the specific algorithms has to date seen less attention in the literature. As it is theoretically impossible to design an algorithm that is best on all possible problems, a common approach in software engineering problems is to first try a Genetic Algorithm, and only afterwards try to refine it or compare it with other algorithms to see if any of them is more suited for the addressed problem. This is particularly important in test generation, since recent work suggests that random search may in practice be equally effective, whereas the reformulation as a many-objective problem seems to be more effective. To shed light on the influence of the search algorithms, we empirically evaluate six different algorithms on a selection of non-trivial open source classes. Our study shows that the use of a test archive makes evolutionary algorithms clearly better than random testing, and it confirms that the many-objective search is the most effective. [less ▲]

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See detailRESTful API Automated Test Case Generation
Arcuri, Andrea UL

in IEEE International Conference on Software Quality, Reliability & Security (QRS) (in press)

Nowadays, web services play a major role in the development of enterprise applications. Many such applications are now developed using a service-oriented architecture (SOA), where microservices is one of ... [more ▼]

Nowadays, web services play a major role in the development of enterprise applications. Many such applications are now developed using a service-oriented architecture (SOA), where microservices is one of its most popular kind. A RESTful web service will provide data via an API over the network using HTTP, possibly interacting with databases and other web services. Testing a RESTful API poses challenges, as inputs/outputs are sequences of HTTP requests/responses to a remote server. Many approaches in the literature do black-box testing, as the tested API is a remote service whose code is not available. In this paper, we consider testing from the point of view of the developers, which do have full access to the code that they are writing. Therefore, we propose a fully automated white-box testing approach, where test cases are automatically generated using an evolutionary algorithm. Tests are rewarded based on code coverage and fault finding metrics. We implemented our technique in a tool called EVOMASTER, which is open-source. Experiments on two open-source, yet non-trivial RESTful services and an industrial one, do show that our novel technique did automatically find 38 real bugs in those applications. However, obtained code coverage is lower than the one achieved by the manually written test suites already existing in those services. Research directions on how to further improve such approach are therefore discussed. [less ▲]

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See detailAbsence of regulator of G-protein signaling 4 does not protect against dopamine neuron dysfunction and injury in the mouse 6-hydroxydopamine lesion model of Parkinson's disease
Ashrafi, Amer UL; Garcia, Pierre UL; Kollmus, Heike et al

in Neurobiology of Aging (in press)

Regulator of G-Protein Signaling 4 (RGS4), a member of the RGS family of proteins that inactivate G-proteins, has gained interest as a potential drug target for neurological disorders, such as epilepsy ... [more ▼]

Regulator of G-Protein Signaling 4 (RGS4), a member of the RGS family of proteins that inactivate G-proteins, has gained interest as a potential drug target for neurological disorders, such as epilepsy and Parkinson’s disease (PD). In the case of PD, the main current option for alleviating motor symptoms are dopamine replacement therapies, which have limitations because of side effects, and reduced effectiveness over the long term. Research on new non-dopaminergic PD drug targets has indicated that inhibition of RGS4 could be an effective adjuvant treatment option. The effectiveness of RGS4 inhibition for an array of PD-linked functional and structural neuroprotection endpoints has not yet been demonstrated. Here, we use the 6-Hydroxydopamine (6-OHDA) lesioning model of the nigrostriatal pathway in mice to address this question. We observe, using a battery of behavioral and pathological measures, that mice deficient for RGS4 are not protected from 6-OHDA induced injury, and show enhanced susceptibility in some measures of motor function. Our results suggest that inhibition of RGS4 as a non-dopaminergic target for PD should be approached with caution. [less ▲]

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See detailA multifactorial and integrative approach to impulsivity in neuropsychology: Insights from the UPPS model of impulsivity
Rochat, Lucien; Billieux, Joël UL; Gagnon, Jean et al

in Journal of Clinical and Experimental Neuropsychology (in press)

Risky and excessive behaviors, such as aggressive and compulsive behaviors, are frequently described in patients with brain damage and have dramatic psychosocial consequences. Although there is strong ... [more ▼]

Risky and excessive behaviors, such as aggressive and compulsive behaviors, are frequently described in patients with brain damage and have dramatic psychosocial consequences. Although there is strong evidence that impulsivity constitutes a key factor at play in these behaviors, the literature about impulsivity in neuropsychology is to date scarce. In addition, examining and understanding these problematic behaviors requires the assumption that impulsivity is a multidimensional construct. Consequently, this article aims at shedding light on frequent risky and excessive behaviors in patients with brain damage by focusing on a unified, comprehensive, and well-validated model, namely, the UPPS model of impulsivity (Whiteside & Lynam, 2001). This model considers impulsivity as a multidimensional construct that includes four facets: urgency, (lack of) premeditation, (lack of) perseverance, and sensation seeking. Furthermore, we discuss the psychological mechanisms underlying the dimensions of impulsivity, as well as the laboratory tasks designed to assess each mechanism and their neural bases. We then present a scale specifically designed to assess these four dimensions of impulsivity in patients with brain damage and examine the data regarding this multidimensional approach to impulsivity in neuropsychology. This review supports the need to adopt a multifactorial and integrative approach toward impulsive behaviors, and the model presented provides a valuable rationale to disentangle the nature of brain systems and mechanisms underlying impulsive behaviors in patients with brain damage. It may also foster further relevant research in the field of impulsivity and improve assessment and rehabilitation of impulsive behaviors in clinical settings. [less ▲]

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See detail(Re)shaping Educational Research through ‘Programification’: Institutional Expansion, Change, and Translation in Norway
Zapp, Mike UL; Helgetun, Jo B.; Powell, Justin J W UL

in European Journal of Education (in press), 52

Educational research in Norway has experienced unprecedented structural expansion as well as cognitive shifts over the past two decades, especially due to increased state investments and the strategic use ... [more ▼]

Educational research in Norway has experienced unprecedented structural expansion as well as cognitive shifts over the past two decades, especially due to increased state investments and the strategic use of extensive and multi-year thematic programs to fund research projects. Applying a neo-institutionalist framework, we examine institutionalization dynamics in cultural-cognitive, normative, and regulative dimensions over the past two decades using interviews, research program calls, policy documents, and funding data. In the cultural-cognitive dimension, we find references to the knowledge society, the importance of evidence in policy-making, and ideas of quality, excellence, and relevance. In the normative dimension, we find the introduction of new professional and methodological standards, reflecting broader global patterns of academic and epistemic drift. In the regulative dimension, the strengthened role of both government and the Research Council of Norway is manifest in substantial growth in both funding and large-scale, long-term planning, including thematic choices—evidence of ‘programification’. The importance of external models has grown in an era of internationalization, yet translation occurs at every level of governance of educational research. This results in a specific Norwegian research model, guided by a mode of governance of programs, that maintains social values traditionally strong in Nordic societies. [less ▲]

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See detailAutomated Test Case Generation as a Many-Objective Optimisation Problem with Dynamic Selection of the Targets
Panichella, Annibale UL; Kifetew, Fitsum; Tonella, Paolo

in IEEE Transactions on Software Engineering (in press)

The test case generation is intrinsically a multi-objective problem, since the goal is covering multiple test targets (e.g., branches). Existing search-based approaches either consider one target at a ... [more ▼]

The test case generation is intrinsically a multi-objective problem, since the goal is covering multiple test targets (e.g., branches). Existing search-based approaches either consider one target at a time or aggregate all targets into a single fitness function (whole-suite approach). Multi and many-objective optimisation algorithms (MOAs) have never been applied to this problem, because existing algorithms do not scale to the number of coverage objectives that are typically found in real-world software. In addition, the final goal for MOAs is to find alternative trade-off solutions in the objective space, while in test generation the interesting solutions are only those test cases covering one or more uncovered targets. In this paper, we present DynaMOSA (Dynamic Many-Objective Sorting Algorithm), a novel many-objective solver specifically designed to address the test case generation problem in the context of coverage testing. DynaMOSA extends our previous many-objective technique MOSA (Many-Objective Sorting Algorithm) with dynamic selection of the coverage targets based on the control dependency hierarchy. Such extension makes the approach more effective and efficient in case of limited search budget. We carried out an empirical study on 346 Java classes using three coverage criteria (i.e., statement, branch, and strong mutation coverage) to assess the performance of DynaMOSA with respect to the whole-suite approach (WS), its archive-based variant (WSA) and MOSA. The results show that DynaMOSA outperforms WSA in 28% of the classes for branch coverage (+8% more coverage on average) and in 27% of the classes for mutation coverage (+11% more killed mutants on average). It outperforms WS in 51% of the classes for statement coverage, leading to +11% more coverage on average. Moreover, DynaMOSA outperforms its predecessor MOSA for all the three coverage criteria in 19% of the classes with +8% more code coverage on average. [less ▲]

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See detailAutobiografia ed emigrazione. Ricordare, raccontare, costruire
Cicotti, Claudio UL

Book published by Lang (in press)

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See detailKünstliche Sprachen (Plansprachen / Welthilfssprachen)
Sieburg, Heinz UL

in Dembeck, Till; Parr, Rolf (Eds.) Literatur und Mehrsprachigkeit. Ein Handbuch (in press)

Detailed reference viewed: 22 (0 UL)
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See detailChapter 4:A Survey on The Polytopic Takagi-Sugeno Approach: Application to the Inverted Pendulum
Bezzaoucha, Souad UL; Voos, Holger UL; Darouach, Mohamed

in The Inverted Pendulum: From Theory to New Innovations in Control and Robotics (in press)

This book chapter gives a general scope, states the main results obtained and methods used for the Polytopic Takagi-Sugeno approach with a detailed application to the inverted pendulum. Modeling, observer ... [more ▼]

This book chapter gives a general scope, states the main results obtained and methods used for the Polytopic Takagi-Sugeno approach with a detailed application to the inverted pendulum. Modeling, observer and controller design will be considered. [less ▲]

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See detailEbenen der Sprachstandardisierung
Sieburg, Heinz UL

in Dembeck, Till; Parr, Rolf (Eds.) Literatur und Mehrsprachigkeit. Ein Handbuch (in press)

Detailed reference viewed: 6 (0 UL)
See detail'Heilige Sprachen', Weltsprachen. Lingua Franca
Sieburg, Heinz UL

in Dembeck, Till; Parr, Rolf (Eds.) Literatur und Mehrsprachigkeit. Ein Handbuch (in press)

Detailed reference viewed: 10 (0 UL)
See detailSprachkontakt: Pidgins und Kreolsprachen
Sieburg, Heinz UL

in Dembeck, Till; Parr, Rolf (Eds.) Literatur und Mehrsprachigkeit. Ein Handbuch (in press)

Detailed reference viewed: 26 (1 UL)
See detailSpezialsprachen: Fachsprachen, Wissenschaftssprachen
Sieburg, Heinz UL

in Dembeck, Till; Parr, Rolf (Eds.) Literatur und Mehrsprachigkeit. Ein Handbuch (in press)

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See detailThe Century of Science: The Global Triumph of the Research University
Powell, Justin J W UL; Baker, David P.; Fernandez, Frank

in International Perspectives on Education & Society (in press), 33

In The Century of Science, a multicultural, international team of authors examines the global rise of scholarly research in science, technology, engineering, mathematics, and health (STEM+) fields. At the ... [more ▼]

In The Century of Science, a multicultural, international team of authors examines the global rise of scholarly research in science, technology, engineering, mathematics, and health (STEM+) fields. At the beginning of the 20th century, the global center-point of scientific productivity was about half way between Western Europe and the U.S., in the North Atlantic. Then, the center moved steadily westward and slightly southward—reflecting the burgeoning science capacity of the U.S. supported by America’s thriving public and private universities, technological innovation, and overall economic growth. After WWII, this began to change as the course of the world’s scientific center of gravity turned and for the next 70 years traveled eastward, the direction it still travels, especially due to the rise of China and other prolific East Asian countries, such as Japan, Taiwan, and South Korea. Europe continues to be the center of global science. Focusing on these developments, this volume provides historical and sociological understandings of the ways that higher education has become an institution that, more than ever before, shapes science and society. Case studies, supported by the most historically and spatially extensive database on STEM+ publications available, of selected countries in Europe, North America, East Asia, and the Middle East, emphasize recurring themes: the institutionalization and differentiation of higher education systems to the proliferation of university-based scientific research fostered by research policies that support continued university expansion leading to the knowledge society. Growing worldwide, research universities appear to be the most legitimate sites for knowledge production. Countries like France, Germany, the United Kingdom, the United States, and Japan began the 20th century with prerequisites in place to realize the emerging model of university-based research. Over the past several decades, China, South Korea, and Taiwan, with different historical legacies and conflicts in education and research policy, have witnessed explosive growth, sustained by public and private funds. Qatar recently embarked on an ambitious government-driven effort to develop a world-class university sector and cultivate academic STEM+ research from scratch. These more recent entrants to the global scientific enterprise pose the question whether it is possible to leapfrog across decades, or even centuries, of cultivating university systems, to compete globally. Simultaneously with international and regional competition, world-leading science increasingly implies collaboration across cultural and political borders as global scientific production and networking continue to rise exponentially. This volume’s case studies offer new insights into how countries develop the university-based knowledge thought fundamental to meeting social needs and economic demands. Despite repeated warnings that universities would lose in relevance to other organizational forms in the production of knowledge, our findings demonstrate incontrovertibly that universities have become more—not less—important actors in the world of knowledge. The past hundred years have seen the global triumph of the research university. [less ▲]

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See detailThe European Center of Science Productivity: Research Universities and Institutes in France, Germany, and the United Kingdom
Powell, Justin J W UL; Dusdal, Jennifer UL

in International Perspectives on Education & Society (in press), 33

Growth in scientific productivity over the 20th century resulted significantly from three major countries in European science—France, Germany, and the United Kingdom. We chart the development of ... [more ▼]

Growth in scientific productivity over the 20th century resulted significantly from three major countries in European science—France, Germany, and the United Kingdom. We chart the development of universities and research institutes that bolster Europe’s key position in global science. We uncover both stable and dynamic patterns of productivity in the fields of STEM, including health, over the twentieth century. On-going internationalization of higher education and science has been accompanied by increasing competition and collaboration. Despite policy goals to foster innovation and expand research capacity, policies cannot fully account for the differential growth of scientific productivity we chart from 1975 to 2010. Our neoinstitutional framework facilitates explanation of differences in institutional settings, organizational forms, and organizations that produce the most European research. We measure growth of published peer-reviewed articles indexed in Thomson Reuters’ Science Citation Index Expanded (SCIE). Organizational forms vary in their contributions, with universities accounting for nearly half but rising in France; ultrastable in Germany at four-fifths, and growing at around two-thirds in the UK. Differing institutionalization pathways created the conditions necessary for continuous, but varying growth in scientific productivity in the European center of global science. The research university is central in all three countries, and we identify organizations leading in research output. Few analyses explicitly compare across time, space, and different levels of analysis. We show how important European science has been to overall global science productivity. In-depth comparisons, especially the organizational fields and forms in which science is produced, are crucial if policy is to support research and development. [less ▲]

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See detailThe Worldwide Triumph of the Research University and Globalizing Science
Powell, Justin J W UL; Fernandez, Frank; Crist, John T. et al

in International Perspectives on Education & Society (in press), 33

This chapter provides an overview of the findings and chapters of volume 33 in the International Perspectives on Education and Society (IPES) series. It describes the common dataset and methods used by an ... [more ▼]

This chapter provides an overview of the findings and chapters of volume 33 in the International Perspectives on Education and Society (IPES) series. It describes the common dataset and methods used by an international research team. The chapter synthesizes the results of a series of country-level case studies and cross-national and regional comparisons on the growth of scientific research from 1900 until 2011. Additionally, the chapter provides a quantitative analysis of global trends in scientific, peer-reviewed publishing over the same period. The introduction identifies common themes that emerged across the case studies examined in-depth during the multi-year research project Science Productivity, Higher Education, Research Development and the Knowledge Society (SPHERE). First, universities have long been and increasingly are the primary organizations in science production around the globe. Second, the chapters describe in-country and cross-country patterns of competition and collaboration in scientific publications. Third, the chapters describe the national policy environments and institutionalized organizational forms that fostered scientific research. The introduction reviews selected findings and limitations of previous bibliometric studies and explains that the chapters in the volume overcome these limitations by applying neo-institutional theoretical frameworks to analyze bibliometric data over an extensive period. [less ▲]

Detailed reference viewed: 28 (12 UL)