Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailEvolutionary Robustness Testing of Data Processing Systems using Models and Data Mutation
Di Nardo, Daniel UL; Pastore, Fabrizio UL; Arcuri, Andrea UL et al

in Proceedings of the 30th IEEE/ACM International Conference on Automated Software Engineering (2015, November)

System level testing of industrial data processing software poses several challenges. Input data can be very large, even in the order of gigabytes, and with complex constraints that define when an input ... [more ▼]

System level testing of industrial data processing software poses several challenges. Input data can be very large, even in the order of gigabytes, and with complex constraints that define when an input is valid. Generating the right input data to stress the system for robustness properties (e.g. to test how faulty data is handled) is hence very complex, tedious and error prone when done manually. Unfortunately, this is the current practice in industry. In previous work, we defined a methodology to model the structure and the constraints of input data by using UML class diagrams and OCL constraints. Tests were automatically derived to cover predefined fault types in a fault model. In this paper, to obtain more effective system level test cases, we developed a novel search-based test generation tool. Experiments on a real-world, large industrial data processing system show that our automated approach can not only achieve better code coverage, but also accomplishes this using significantly smaller test suites. [less ▲]

Detailed reference viewed: 304 (33 UL)
See detailEVOLVE - A Bridge between Probability, Set Oriented Numerics and Evolutionary Computation IV [EVOLVE 2013, Leiden The Netherlands, July 10-13, 2013]
Emmerich, Michael; Deutz, Andre; Schuetze, Oliver et al

Book published by Springer (2013)

Detailed reference viewed: 67 (7 UL)
See detailEVOLVE - A Bridge between Probability, Set Oriented Numerics, and Evolutionary Computation II
Schütze, O.; Coello, C. A. C.; Bouvry, Pascal UL et al

Book published by Springer (2012)

Detailed reference viewed: 85 (1 UL)
See detailThe Evolving Beta-Liquidity Relationship of Hedge Funds
Siegmann, Arjen; Stefanova, Denitsa UL

E-print/Working paper (2014)

Using an optimal changepoint approach, we find a structural change in the relation between hedge funds’ stock market exposure and aggregate stock market liquidity that takes place in the period 2000 to ... [more ▼]

Using an optimal changepoint approach, we find a structural change in the relation between hedge funds’ stock market exposure and aggregate stock market liquidity that takes place in the period 2000 to 2002. Before the structural break, market betas have no relation to liquidity and only a few style categories of hedge funds show increased market presence when liquidity is low. After the break, the relationship is inverted, pointing towards an increased liquidity timing ability of hedge funds, as users of liquidity. We relate our findings to best execution rules and decimalization in the US stock market that were introduced in that period and impacted aggregate liquidity conditions. Furthermore, the returns to a momentum strategy display a similar structural break and momentum-loading funds constitute a sizeable proportion of hedge funds that manifest a distinct beta-liquidity evolution with a structural break in that period. [less ▲]

Detailed reference viewed: 66 (3 UL)
Full Text
Peer Reviewed
See detailThe evolving beta-liquidity relationship of hedge funds
Stefanova, Denitsa UL; Siegmann, Arjen

in Journal of Empirical Finance (2017), 44

Hedge funds are known to have liquidity-timing capability, but this might be conditional on aggregate market conditions. To test this, we analyze changes in the relation between hedge funds' stock market ... [more ▼]

Hedge funds are known to have liquidity-timing capability, but this might be conditional on aggregate market conditions. To test this, we analyze changes in the relation between hedge funds' stock market exposure and aggregate stock market liquidity. Employing an optimal changepoint approach, we find that equity-oriented hedge funds display a significant shift in liquidity-timing behavior after the major market microstructure changes in the year 2000. The shift is from a negative relation between market beta and liquidity towards a positive relation. We rule out a mechanistic explanation of the results by computing the returns to several familiar risk arbitrage strategies, finding in them no evidence of a similar shift in liquidity timing. [less ▲]

Detailed reference viewed: 74 (5 UL)
Peer Reviewed
See detailEvolving Networks of Inventors
Cowan, Robin; Jonard, Nicolas UL; Zimmermann, Jean-Benoît

in Journal of Evolutionary Economics (2006), 16

Detailed reference viewed: 56 (2 UL)
Full Text
See detailEvolving Software - Introduction to the Special Theme
Mens, Tom; Klein, Jacques UL

in ERCIM News (2012), 88

Detailed reference viewed: 58 (1 UL)
Full Text
Peer Reviewed
See detailEvoMaster: Evolutionary Multi-context Automated System Test Generation
Arcuri, Andrea UL

in IEEE Conference on Software Testing, Validation and Verification (2018)

This paper presents EVOMASTER, an open-source tool that is able to automatically generate system level test cases using evolutionary algorithms. Currently, EVOMASTER targets RESTful web services running ... [more ▼]

This paper presents EVOMASTER, an open-source tool that is able to automatically generate system level test cases using evolutionary algorithms. Currently, EVOMASTER targets RESTful web services running on JVM technology, and has been used to find several faults in existing open-source projects. We discuss some of the architectural decisions made for its implementation, and future work. [less ▲]

Detailed reference viewed: 134 (1 UL)
Full Text
Peer Reviewed
See detailEvoSuite at the SBST 2015 Tool Competition
Fraser, Gordon; Arcuri, Andrea UL

in 8th International Workshop on Search-Based Software Testing (SBST) 2015 (2015)

EVOSUITE is a mature research prototype that automatically generates unit tests for Java code. This paper summarizes the results and experiences of EVOSUITE’s participation at the third unit testing ... [more ▼]

EVOSUITE is a mature research prototype that automatically generates unit tests for Java code. This paper summarizes the results and experiences of EVOSUITE’s participation at the third unit testing competition at SBST 2015. An unfortunate issue of conflicting dependency versions in two out of the nine benchmark projects reduced EVOSUITE’s overall score to 190:6, leading to the overall second rank. [less ▲]

Detailed reference viewed: 88 (5 UL)
Full Text
Peer Reviewed
See detailEvoSuite at the SBST 2016 Tool Competition
Gordon, Fraser; Arcuri, Andrea UL

in The 9th International Workshop on SEARCH-BASED SOFTWARE TESTING (SBST) (2016)

EVOSUITE is a search-based tool that automatically generates unit tests for Java code. This paper summarizes the results and experiences of EVOSUITE’s participation at the fourth unit testing competition ... [more ▼]

EVOSUITE is a search-based tool that automatically generates unit tests for Java code. This paper summarizes the results and experiences of EVOSUITE’s participation at the fourth unit testing competition at SBST 2016, where EVOSUITE achieved the highest overall score. [less ▲]

Detailed reference viewed: 95 (3 UL)
Full Text
Peer Reviewed
See detailEVOSUITE at the SBST 2017 Tool Competition
Fraser, Gordon; Rojas, José Miguel; Campos, José et al

in IEEE/ACM International Workshop on Search-Based Software Testing (SBST) (2017)

EVOSUITE is a search-based tool that automatically generates unit tests for Java code. This paper summarises the results and experiences of EVOSUITE’s participation at the fifth unit testing competition ... [more ▼]

EVOSUITE is a search-based tool that automatically generates unit tests for Java code. This paper summarises the results and experiences of EVOSUITE’s participation at the fifth unit testing competition at SBST 2017, where EVOSUITE achieved the highest overall score. [less ▲]

Detailed reference viewed: 99 (7 UL)
Full Text
Peer Reviewed
See detailEvoSuite at the SBST 2018 Tool Competition
Fraser, Gordon; Rojas, Jose; Arcuri, Andrea UL

in 2018 ACM/IEEE 11th International Workshop on Search-Based Software Testing (2018)

EvoSuite is a search-based tool that automatically generates executable unit tests for Java code (JUnit tests). This paper summarises the results and experiences of EvoSuite’s participation at the sixth ... [more ▼]

EvoSuite is a search-based tool that automatically generates executable unit tests for Java code (JUnit tests). This paper summarises the results and experiences of EvoSuite’s participation at the sixth unit testing competition at SBST 2018, where EvoSuite achieved the highest overall score (687 points) for the fifth time in six editions of the competition. [less ▲]

Detailed reference viewed: 66 (6 UL)
See detailDer ewige Hunger des Gefühls Säkularreligiöse Aspekte in Sprangers Kulturpäd­agogik und Kulturpsychologie
Priem, Karin UL

in Meyer-Willner, Gerhard (Ed.) Eduard Spranger. Aspekte seines Werks aus heutiger Sicht (2001)

Detailed reference viewed: 33 (0 UL)
See detailThe ex officio doctrine in European consumer law. A procedural tool reinvigorating individual consumer litigation
Beka, Anthi UL

Doctoral thesis (2015)

The thesis delves into the theoretical underpinnings of the establishment of the powers of national courts to raise pleas of Union consumer law of their own motion and examines the novel dimensions this ... [more ▼]

The thesis delves into the theoretical underpinnings of the establishment of the powers of national courts to raise pleas of Union consumer law of their own motion and examines the novel dimensions this opens for individual consumer litigation. In an extensive line of case-law the Court of Justice has built the principle of an active court in individual consumer litigation around the concepts of effectiveness of mandatory rules of consumer law and weaker party protection. Such understanding of judicial powers has been formulated, in certain circumstances, independently from the respective national procedural rules. The thesis analyses the question in terms of a Union consumer ex officio doctrine, presents its implications from a civil justice perspective and its important contribution for the effective judicial protection of consumers and Union citizens. [less ▲]

Detailed reference viewed: 491 (43 UL)
Full Text
Peer Reviewed
See detailThe ex-ante effects of non-contributory pensions in Colombia and Peru
Olivera Angulo, Javier UL; Zuluaga, Blanca

in Journal of International Development (2014), 26(7), 949-973

This paper studies the ex-ante effects of the implementation of a Non-Contributory Pension (NCP) program in Colombia and Peru. Relying on household survey data, we simulate the transfer’s potential impact ... [more ▼]

This paper studies the ex-ante effects of the implementation of a Non-Contributory Pension (NCP) program in Colombia and Peru. Relying on household survey data, we simulate the transfer’s potential impact on poverty, inequality, fiscal cost, and the probability of affiliation to contributory pensions. Our results show that a NCP reduces poverty and inequality among the elderly, particularly in rural areas, at an arguably limited fiscal cost. Regarding behavioural effects, there is not a large impact on the probability of affiliation to contributory pensions when the program is targeted to the poor, with the exception of Peruvian women. Finally, we also compute some potential effects on the recipient’s labour supply. [less ▲]

Detailed reference viewed: 63 (9 UL)
Full Text
Peer Reviewed
See detailAn ex-post View of Inequality of Opportunity in France and its Regions
Carpantier, Jean-Francois UL; Sapata, Christelle

in Journal of Labor Research (2013), 34(3), 281-311

Detailed reference viewed: 198 (120 UL)
Full Text
Peer Reviewed
See detailExact and approximate route set generation for resilient partial observability in sensor location problems
Rinaldi, Marco UL; Viti, Francesco UL

in Transportation Research. Part B : Methodological (2017), 105

Sensor positioning is a fundamental problem in transportation networks, as the location of sensors strongly determines how traffic flows are observable and hence manageable. This paper aims to develop a ... [more ▼]

Sensor positioning is a fundamental problem in transportation networks, as the location of sensors strongly determines how traffic flows are observable and hence manageable. This paper aims to develop a methodology to determine sensor locations on a network such that an optimal trade-off solution is found between the amount of sensors installed and the resilience of the sensor set. In particular, we propose exact and heuristic solutions for identifying the optimal route sets such that no other route would include any additional information for finding optimal full and partial observability solutions. This is an important contribution to sensor location problems, as route-based link flow inference problems have non-unique solutions, strongly depending on the used link-route information. The properties of the new methodology are analyzed and illustrated through different case studies, and the advantages of the algorithms are quantified both for full and for partial observability solutions. Due to the route sets found by our approach, we are able to find full observability solutions characterized by a small number of sensors, while yet being efficient also in terms of partial observability. We perform validation tests on both small and real-life sized network instances. © 2017 Elsevier Ltd [less ▲]

Detailed reference viewed: 86 (3 UL)
Full Text
Peer Reviewed
See detailExact and heuristic approaches to solve the Internet shopping optimization problem with delivery costs
Lopez Loces, Mario; Musial, Jedrzej; Pecero, Johnatan UL et al

in International Journal of Applied Mathematics and Computer Science (2016), 26

Internet shopping has been one of the most common online activities, carried out by millions of users every day. As the number of available offers grows, the difficulty in getting the best one among all ... [more ▼]

Internet shopping has been one of the most common online activities, carried out by millions of users every day. As the number of available offers grows, the difficulty in getting the best one among all the shops increases as well. In this paper we propose an integer linear programming (ILP) model and two heuristic solutions, the MinMin algorithm and the cellular processing algorithm, to tackle the Internet shopping optimization problem with delivery costs. The obtained results improve those achieved by the state-of-the-art heuristics, and for small real case scenarios ILP delivers exact solutions in a reasonable amount of time. [less ▲]

Detailed reference viewed: 79 (5 UL)