ppOpen-HPC: Open Source Infrastructure for Development and Execution of Large-Scale Scientific Applications on Post-Peta-Scale Supercomputers with Automatic Tuning (AT)

2015 ◽  
pp. 15-35 ◽  
Author(s):  
Kengo Nakajima ◽  
Masaki Satoh ◽  
Takashi Furumura ◽  
Hiroshi Okuda ◽  
Takeshi Iwashita ◽  
...  
Keyword(s):  
Open Source ◽  
Large Scale ◽  
Automatic Tuning ◽  
Scientific Applications

scholarly journals A standardized framework for testing the performance of sleep-tracking technology: step-by-step guidelines and open-source code

SLEEP ◽  
2020 ◽  
Author(s):  
Luca Menghini ◽  
Nicola Cellini ◽  
Aimee Goldstone ◽  
Fiona C Baker ◽  
Massimiliano de Zambotti
Keyword(s):  
Open Source ◽  
Validation Studies ◽  
Large Scale ◽  
Analytical Framework ◽  
Clinical Settings ◽  
Large Scale Data ◽  
Fast Pace ◽  
Epoch Analysis ◽  
Tracking Devices

Abstract Sleep-tracking devices, particularly within the consumer sleep technology (CST) space, are increasingly used in both research and clinical settings, providing new opportunities for large-scale data collection in highly ecological conditions. Due to the fast pace of the CST industry combined with the lack of a standardized framework to evaluate the performance of sleep trackers, their accuracy and reliability in measuring sleep remains largely unknown. Here, we provide a step-by-step analytical framework for evaluating the performance of sleep trackers (including standard actigraphy), as compared with gold-standard polysomnography (PSG) or other reference methods. The analytical guidelines are based on recent recommendations for evaluating and using CST from our group and others (de Zambotti and colleagues; Depner and colleagues), and include raw data organization as well as critical analytical procedures, including discrepancy analysis, Bland–Altman plots, and epoch-by-epoch analysis. Analytical steps are accompanied by open-source R functions (depicted at https://sri-human-sleep.github.io/sleep-trackers-performance/AnalyticalPipeline_v1.0.0.html). In addition, an empirical sample dataset is used to describe and discuss the main outcomes of the proposed pipeline. The guidelines and the accompanying functions are aimed at standardizing the testing of CSTs performance, to not only increase the replicability of validation studies, but also to provide ready-to-use tools to researchers and clinicians. All in all, this work can help to increase the efficiency, interpretation, and quality of validation studies, and to improve the informed adoption of CST in research and clinical settings.

scholarly journals PRISMS-Fatigue computational framework for fatigue analysis in polycrystalline metals and alloys

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Mohammadreza Yaghoobi ◽  
Krzysztof S. Stopka ◽  
Aaditya Lakshmanan ◽  
Veera Sundararaghavan ◽  
John E. Allison ◽  
...  
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Large Scale ◽  
Metals And Alloys ◽  
Analysis Tool ◽  
Computational Framework ◽  
Crystal Plasticity Finite Element ◽  
Polycrystalline Metals ◽  
Simulation Based ◽  
Open Source Framework

AbstractThe PRISMS-Fatigue open-source framework for simulation-based analysis of microstructural influences on fatigue resistance for polycrystalline metals and alloys is presented here. The framework uses the crystal plasticity finite element method as its microstructure analysis tool and provides a highly efficient, scalable, flexible, and easy-to-use ICME community platform. The PRISMS-Fatigue framework is linked to different open-source software to instantiate microstructures, compute the material response, and assess fatigue indicator parameters. The performance of PRISMS-Fatigue is benchmarked against a similar framework implemented using ABAQUS. Results indicate that the multilevel parallelism scheme of PRISMS-Fatigue is more efficient and scalable than ABAQUS for large-scale fatigue simulations. The performance and flexibility of this framework is demonstrated with various examples that assess the driving force for fatigue crack formation of microstructures with different crystallographic textures, grain morphologies, and grain numbers, and under different multiaxial strain states, strain magnitudes, and boundary conditions.

scholarly journals Open-Source Tools and Containers for the Production of Large-Scale S/TEM Datasets

2021 ◽  
Vol 27 (S1) ◽  
pp. 62-63
Author(s):  
Alexander M Rakowski ◽  
Joydeep Munshi ◽  
Benjamin Savitzky ◽  
Shreyas Cholia ◽  
Matthew L Henderson ◽  
...  
Keyword(s):  
Open Source ◽  
Large Scale

Social Status in an Open-Source Community

2005 ◽  
Vol 70 (5) ◽  
pp. 823-842 ◽  
Author(s):  
Daniel Stewart
Keyword(s):  
Open Source ◽  
Online Community ◽  
Large Scale ◽  
Social Cues ◽  
Natural Setting ◽  
Laboratory Setting ◽  
Community Members ◽  
Software Developers ◽  
Status Mobility ◽  
The Status

Despite a fair amount of conjecture regarding the circumstances that lead to the generation of status orders, most of the previous literature in this area typically has studied the effects of social cues within a laboratory setting. This article analyzes the evolution of the status hierarchy within a large-scale, natural setting. The results of empirical analyses assessing a large online community of software developers show that in the process of status attainment, community members tend to evaluate a focal actor's reputation according to publicly available social references. Ironically, these same social references also work to constrain an actor's status mobility.

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