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Brandt, John (author), Goyal, N. (author), Moroney, Matthew (author), Janaskie, Sophie (author), Hsu, Angel (author)Research on the economic burden of air pollution has focused primarily on its macroeconomic impact. However, as some studies have found that air pollution can lead to avoidance behavior–for example, reducing the time spent outdoors–we hypothesize that it can also influence consumer spending activity. We combine high frequency data on ozone and...journal article 2024
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Brandt, R. K. (author), Haustein, S. (author), Hagenzieker, Marjan (author), Møller, M. (author)Cyclists’ phone use can cause distractions and impose risks towards traffic safety. To prevent phone-related distractions, the Netherlands introduced a ban on handheld (HH) phone use for cyclists in July 2019. The effects of traffic rules on phone use and their underlying mechanisms are, however, uncertain. Comparing survey results from the...journal article 2023
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Brandt, C.E. (author), Wang, D. (author), Zaidman, A.E. (author)Test amplification generates new tests by mutating existing, developer-written tests and keeping those tests that improve the coverage of the test suite. Current amplification tools focus on starting from a specific test and propose coverage improvements all over a software project, requiring considerable effort from the software engineer to...conference paper 2023
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Brandt, Rebecca Karstens (author), Haustein, Sonja (author), Hagenzieker, Marjan (author), Møller, Mette (author)Phone use is likely to distract cyclists and possibly increase crash risk. Therefore, handheld phone use among cyclists is forbidden by law in some countries, even though cyclists use compensatory strategies to attempt to mitigate distractions and related effects. Both demographic, environmental, and psychological factors have been associated...journal article 2022
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Boone, Casper (author), Brandt, C.E. (author), Zaidman, A.E. (author)The most common reason for Continuous Integration (CI) builds to break is failing tests. When a build breaks, a developer often has to scroll through hundreds to thousands of log lines to find which test is failing and why. Finding the issue is a tedious process that relies on a developer's experience and increases the cost of software testing....conference paper 2022
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Brandt, C.E. (author), Zaidman, A.E. (author)Automatically generating test cases for software has been an active research topic for many years. While current tools can generate powerful regression or crash-reproducing test cases, these are often kept separately from the maintained test suite. In this paper, we leverage the developer’s familiarity with test cases amplified from existing,...journal article 2022
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Brandt, C.E. (author), Zaidman, A.E. (author)Developer testing, the practice of software engineers programmatically checking that their own components behave as they expect, has become the norm in today's software projects. With the constantly growing size and complexity of software projects and with the rise of automated test generation tools, understanding a test case is becoming more...conference paper 2022
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Oosterbroek, W. (author), Brandt, C.E. (author), Zaidman, A.E. (author)Test amplification generates new tests by modifying existing, manually written tests.<br/>Up until now, this process preserves statements that were relevant for the original test case but are no longer needed for the behavior of the new test case.<br/>These unnecessary statements impact the readability of the tests in question.<br/>As a part of...conference paper 2021
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Nijkamp, N. (author), Brandt, C.E. (author), Zaidman, A.E. (author)Test amplification generates new test cases that improve the coverage of an existing test suite. To convince developers to integrate these new test cases into their test suite, it is crucial to convey the behavior and the improvement in coverage that the amplified test case provides. In this paper, we present NATIC, an approach to generate names...conference paper 2021
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Brandt, C.E. (author), Panichella, A. (author), Zaidman, A.E. (author), Beller, M.M. (author)Build logs are textual by-products that a software build process creates, often as part of its Continuous Integration (CI) pipeline. Build logs are a paramount source of information for developers when debugging into and understanding a build failure. Recently, attempts to partly automate this time-consuming, purely manual activity have come up,...conference paper 2020
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Nasikun, A. (author), Brandt, C. (author), Hildebrandt, K.A. (author)We introduce a construction of subspaces of the spaces of tangential vector, n-vector, and tensor fields on surfaces. The resulting subspaces can be used as the basis of fast approximation algorithms for design and processing problems that involve tangential fields. Important features of our construction are that it is based on a general...journal article 2020
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Brandt, C. (author)The research field of geometry processing is concerned with the representation, analysis, modeling, simulation and optimization of geometric data. In this thesis, we introduce novel techniques and efficient algorithms for problems in geometry processing, such as the modeling and simulation of elastic deformable objects, the design of tangential...doctoral thesis 2019
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Brandt, C. (author), Scandolo, L. (author), Eisemann, E. (author), Hildebrandt, K.A. (author)We introduce the Reduced Immersed Method (RIM) for the real-time simulation of two-way coupled incompressible fluids and elastic solids and the interaction of multiple deformables with (self-)collisions. Our framework is based on a novel discretization of the immersed boundary equations of motion, which model fluid and deformables as a single...journal article 2019
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Taş, Neslihan (author), Brandt, Bernd W. (author), Braster, Martin (author), van Breukelen, B.M. (author), Röling, Wilfred F.M. (author)Microbial communities in groundwater ecosystems can develop the capacity to degrade complex mixtures of chemicals resulting from pollution by landfill leachate. Monitoring this natural attenuation requires insight into the metabolic potential and activity of microbial communities. We contrasted the metagenomes and metatranscriptomes from a...journal article 2018
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Nasikun, A. (author), Brandt, C. (author), Hildebrandt, K.A. (author)The spectrum and eigenfunctions of the Laplace-Beltrami operator are at the heart of effective schemes for a variety of problems in geometry processing. A burden attached to these spectral methods is that they need to numerically solve a large-scale eigenvalue problem, which results in costly precomputation. In this paper, we address this...journal article 2018
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Brandt, C. (author), Scandolo, L. (author), Eisemann, E. (author), Hildebrandt, K.A. (author)We introduce a variational approach for modeling n-symmetry vector and direction fields on surfaces that supports interpolation and alignment constraints, placing singularities and local editing, while providing real-time responses. The approach is based on novel biharmonic and m-harmonic energies for n-fields on surface meshes and the...journal article 2018
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Brandt, C. (author), Hildebrandt, K.A. (author)The natural vibration modes of deformable objects are a fundamental physical phenomenon. In this paper, we introduce <em>compressed vibration modes</em>, which, in contrast to the natural vibration modes, are localized (“sparse”) deformations. The localization is achieved by augmenting the objective which has the vibration modes as minima by a...journal article 2017
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Picano, Francesco (author), Simões Costa, P. (author), Breugem, W.P. (author), Brandt, Luca (author)Dense suspensions are usually investigated in the laminar limit where inertial effects are insignificant. In this regime, the main effect of the suspended phase is to alter the rheological behavior of the flow which always displays higher effective viscosity with respect to the carrier fluid. When the flow rate is high enough, i.e. at high...conference paper 2017
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Simões Costa, P. (author), Picano, Francesco (author), Brandt, Luca (author), Breugem, W.P. (author)The macroscopic behavior of dense suspensions of neutrally buoyant spheres in turbulent plane channel flow is examined. We show that particles larger than the smallest turbulence scales cause the suspension to deviate from the continuum limit in which its dynamics is well described by an effective suspension viscosity. This deviation is...journal article 2016
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Picano, F. (author), Costa, P. (author), Breugem, W.P. (author), Brandt, L. (author)Dense suspensions are usually investigated in the laminar limit where inertial effects are insignificant. When the flow rate is high enough, i.e. at high Reynolds number, the flow may become turbulent and the interaction between solid and liquid phases modifies the turbulence we know in single-phase fluids. In the present work, we study...conference paper 2015