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115 results for “data compression”
Data from Bremmer et al. (2017) Heading representations in primates are compressed by saccades. Nature Communications
<p>1. Electrophysiology</p> <p>Experiments had previously been performed in three trained male macaque monkeys (C, H and R). Data, i.e. neural activity, come from the medial superior temporal area (area MST) in two hemispheres of monkeys R (Dataset #-1) and H (Dataset #-2) and from the ventral intraparietal area (area VIP) in two hemispheres of monkeys H (Dataset #-3) and C (Dataset #-4). Eye position was recorded at 500 Hz.</p> <p>Optic flow stimuli consisted of large-field computer generated sequences that were back projected via a video projector (Electrohome) onto a tangent screen, 48 cm in front of the monkey. The size of the projection covered the central 90° x 90° of the visual field. Optic flow sequences (15s – 20s) simulated self-motion of a virtual observer over an extended horizontal plane covered with a texture pattern, located 37cm below eye–level. Trials simulated self–motion in one of three directions: 30° to the left, straight-ahead, and 30° to the right. Data come from 71 neurons with a significant tuning for heading.</p> <p>In primates, self-motion stimuli induce reflexive, optokinetic like eye movements. For further data analysis, we determined periods of slow tracking and saccades. Tracking phases were temporally aligned to the onset of the preceding saccade (termed <strong>Trial</strong> in the following). Trial duration was 700 ms: from -200ms (i.e. 200 ms before the saccade) to 500 ms (i.e. 50 ms after the saccade. Eye-movement data are stored in the data files <strong>GrandAna1Data.mat</strong> (horizontal eye position) and <strong>GrandAna2Data.mat</strong> (vertical eye position). Neural activity in 20 ms bins was determined across these tracking phases for each trial for each of the three self-motion directions. Data come from single- or multi-electrode recordings. Activity from up to seven neurons could be recorded simultaneously. This data is stored in the data file <strong>PSTH.mat</strong>.</p> <p>2. Psychophysics</p> <p><strong>Data on perisaccadic perception of heading.</strong></p> <p>Files:</p> <p><strong>main_exp.zip</strong>, main experiment in which all subjects performed a vertical saccade in the center of the screen (x=0°)</p> <p><strong>head_15.zip</strong>, control using the same vertical saccade as main_exp.zip but with head turned 15 degrees to the left (-15°)</p> <p><strong>eye_15.zip</strong>, control using the vertical saccade at a position 15 degrees to the left (-15°) while the head is directed straight ahead (0°)</p> <p>Content of the files:</p> <p>Each subject is represented by one .mat file. In each file two variables are stored:</p> <p>Fix_Antwort: Control - heading perception during fixation. Column 1 presented heading, column 2 perceived heading</p> <p>Sacc_Antwort: Cell array containing data on perisaccadic perception.</p> <p>{1} presented heading = -30° (left)</p> <p>{2} presented heading = -15°</p> <p>{3} presented heading = 0°</p> <p>{4} presented heading = 15°</p> <p>{5} presented heading = 30° (right)</p> <p>In each cell, each line represents one single trial:</p> <p>Column 1: time of the onset of the heading stimulus relative to saccade onset (in ms)</p> <p>Column 2: perceived heading</p>
Data for: Seasonally mediated niche partitioning in a vertically compressed pelagic predator guild
<p>Niche partitioning among closely related, sympatric species is a fundamental concept in ecology, and its mechanisms are of broad interest for understanding ecosystem functioning and predicting the impacts of human-driven environmental change. However, identifying mechanisms by which top marine predators partition available resources has been especially challenging given the difficulty of quantifying resource use of large pelagic animals. In the eastern tropical Pacific (ETP), three large, highly mobile and ecologically similar pelagic predators (blue marlin (<em>Makaira</em> <em>nigricans</em>), black marlin (<em>Istiompax</em> <em>indica</em>) and sailfish (<em>Istiophorus platypterus))</em> coexist in a vertically compressed habitat. To evaluate each species' ecological niche, we leveraged a decade of recreational fisheries data, multi-year satellite tracking with high-resolution dive data, and stable isotope analysis. Fishery interaction and telemetry-based three-dimensional seasonal utilization distributions suggested high spatial and temporal overlap among species; however, seasonal and diel variability in diving behaviour produced spatial partitioning, leading to low trophic overlap among species. Expanding oxygen minimum zones will reduce the available vertical habitat within predator guilds, likely leading to increases in interspecific competition. Thus, understanding the mechanisms of habitat partitioning among predators in the vertically compressed ETP can provide insight into how predators in other ocean regions may respond to vertically limited habitats.</p>
Data for Accelerating Quantum Computations of Chemistry Through Regularized Compressed Double Factorization
<p>Dataset substantiating the claims in <a href="https://arxiv.org/abs/2212.07957">[2212.07957] Accelerating Quantum Computations of Chemistry Through Regularized Compressed Double Factorization (arxiv.org)</a></p>
Supporting data for "Rigidity transition of a highly compressible granular medium"
<p>This repertory contains the supporting data for the article "Rigidity transition of a highly compressible granular medium"</p> <p>Content:<br>- supplementary_videos<br>The seven supplementary videos associated with the article.<br>- assembly <br>The experimental raw force data and data processed by image analysis of the ring assemblies, for all the parameters explored.<br>- single_ring<br>The FEM data and processed experimental data for the single ring compression and interactions. <br>- COMSOL <br>Contains the COMSOL files to run the FEM simulations and the associated Neo-Hookean material law. <br>- image_analysis<br>Raw images of the five first cycles for gamma_0=0.40 and \Phi=1.00, with a MATLAB code to process the images and extract the relevant quantities. </p> <p>Each category comes with a dedicated README.txt that details its content. </p>
Compression-driven viscous fingering: Experimental and numerical data
<p>These data are from experiments and numerical simulations of viscous fingering in a rigid, radial, oil-filled Hele-Shaw cell driven by the compression of a connected air reservoir. The methods and data are presented in the authors' joint-submissions and their supporting information:</p> <ul> <li>L. C. Morrow, C. Cuttle, and C. W. MacMinn, Gas compression systematically delays the onset of viscous fingering, Physical Review Letters 131, 224002 (2023).</li> <li>C. Cuttle, L. C. Morrow, and C. W. MacMinn, Compression-driven viscous fingering in a radial Hele-Shaw cell, Physical Review Fluids 8, 113904 (2023).</li> </ul> <p>We here provide all raw data for 2 experimental repetitions and 5 numerical repetitions, over the full range of parameters reported.</p> <p>See README file for full details.</p> <p>VERSION 2: The pressure data are now given in the correct units of Pa. Note that the pressure data in Version 1 are identical, except for the fact that they are mistakenly given in units of PSI.</p>
NuSHRED - Compressed Data
<p>Compressed Data for the <a href="https://github.com/ERMETE-Lab/NuSHRED" target="_blank" rel="noopener">Github repository</a> on the application of the Shallow Recurrent Decoder (SHRED) to Nuclear Reactor systems.</p> <p>The simulation data (compressed) available are:</p> <ul> <li>[D1] Molten Salt Fast Reactor (MSFR) in the accidental scenario Unprotected Loss Of Fuel Flow (ULOFF) - Single Transient (Reconstruction mode)</li> <li>[D2] Molten Salt Fast Reactor (MSFR) in the accidental scenario Unprotected Loss Of Fuel Flow (ULOFF) - Parametric Transients</li> <li>[D3] DYNASTY Experimental Facility - Single Transient (Reconstruction & Prediction mode) and Parametric Transients</li> </ul>
InSAR data for "Transcrustal compressible fluid flow explains the Altiplano-Puna deformation anomaly"
<p>InSAR data presented in the paper "Transcrustal compressible fluid flow explains the Altiplano-Puna deformation anomaly". See file "README" for detailed descriptions of each item.</p>
Data from: Compression principle and Zipf's law of brevity in infochemical communication
<p>Compression has been presented as a general principle of animal communication. Zipf's law of brevity is a manifestation of this postulate and can be generalised as the tendency of more frequent communicative elements to be shorter. Previous works supported this claim, showing evidence of Zipf's law of brevity in animal acoustical communication and human language. However, a significant part of the communicative effort in biological systems is carried out in other transmission channels, such as those based on infochemicals. To fill this gap, we seek, for the first time, shreds of evidence of this principle in infochemical communication by analysing the statistical tendency of more frequent infochemicals to be chemically shorter and lighter. We analyse data from the largest and most comprehensive open-access infochemical database known as Pherobase, recovering Zipf's law of brevity in interspecific communication (allelochemicals) but not in intraspecific communication (pheromones). Moreover, these results are robust even when addressing different magnitudes of study or mathematical approaches. Therefore, different dynamics from the compression principle would dominate intraspecific chemical communication, defying the universality of Zipf's law of brevity. To conclude, we discuss the exception found for pheromones in the light of other potential communicative paradigms such as pressures on successful communication or the Handicap principle.</p>
Data from: Remnant salmon life history diversity rediscovered in a highly compressed habitat
<p>Chinook salmon (<em>Oncorhynchus tshawytscha</em>) display remarkable life history diversity underpinning their ability to adapt to environmental change. Maintaining life history diversity is vital to the resilience and stability of Chinook salmon metapopulations, particularly under rapidly changing climates. However, the conditions that promote life history diversity are rapidly disappearing, as anthropogenic forces promote homogenization of habitats and genetic lineages. In this study, we use the highly modified Yuba River in California to understand if distinct genetic lineages and life history still exist, despite reductions in spawning habitat and hatchery practices that have promoted introgression. There currently is a concerted effort to protect federally listed spring run populations, given that few wild populations still exist. Despite this, we lack a comprehensive understanding of the genetic and life history diversity of Chinook salmon present in the Yuba River system. To understand this diversity, we collected migration timing data and GREB1L genotypes from hook-and-line, acoustic tagging, and carcass surveys of Chinook salmon in the Yuba River between 2009-2011. Variation in the GREB1L region of the genome is tightly linked with run timing in Chinook salmon throughout the range, but the relationship between this variation and entry on spawning grounds is little explored in the Central Valley. We found that the date Chinook salmon crossed the lowest barrier to Yuba River spawning habitat (Daguerre Point Dam) was tightly correlated with their GREB1L genotype. Importantly, our study confirms that ESA-listed spring run Chinook salmon are spawning in the Yuba River, promoting a portfolio of life history and genetic diversity, despite spawning in a compressed habitat. This work highlights the need to identify and protect this life history diversity in heavily impacted systems to maintain healthy Chinook salmon metapopulations in those systems. Without this, we run the risk of losing the last vestiges of important variation.</p>
High-Level and Efficient Stream Parallelism on Multi-core Systems with SPar for Data Compression Applications
<p>The stream processing domain is present in several real-world applications that are running on multi-core systems. In this paper, we focus on data compression applications that are an important sub-set of this domain. Our main goal is to assess the programmability and efficiency of domain-specific language called SPar. It was specially designed for expressing stream parallelism and it promises higher-level parallelism abstractions without significant performance losses. Therefore, we parallelized Lzip and Bzip2 compressors<br> with SPar and compared with state-of-the-art frameworks. The results revealed that SPar is able to efficiently exploit stream parallelism as well as provide suitable abstractions with less code intrusion and code re-factoring.</p>
Pressure-based algorithm for compressible interfacial flows with acoustically-conservative interface discretisation (Supporting data)
<p>The dataset contains sample numerical results associated with the manuscript under the same title, "Pressure-based algorithm for compressible interfacial flows with acoustically-conservative interface discretisation", published in Journal of Computational Physics (2018), https://doi.org/10.1016/j.jcp.2018.04.028.</p>
Data presented in "Deep laser cooling and efficient magnetic compression of molecules"
<p>Experimental data presented in our paper "Deep laser cooling and efficient magnetic compression of molecules"</p>
Experimental and theoretical data generated to study effect of crystallite size on the flexibility and negative compressibility of ZIF-8
<p><span>Open access to experimental data generated by the project </span><a href="https://www.electro-intrusion.eu/en"><span>Electro-Intrusion</span></a><span> (101017858, Horizon 2020, European Union) along with the research on the thermal behaviour of hydrophobic porous materials to be used in intrusion-extrusion applications. Research pertaining to Task 2.1 (WP2).</span></p> <p><span>Underlying data for the publication Johnson, L. J. W. et al. Effect of Crystallite Size on the Flexibility and Negative Compressibility of Hydrophobic Metal–Organic Frameworks. Nano Letters 2023, 23, 10682-10686. <a title="DOI URL" href="https://doi.org/10.1021/acs.nanolett.3c02431">https://doi.org/10.1021/acs.nanolett.3c02431</a> Data related to Figures 1, 2, and 3 in the article.</span></p>
Model output data for compressible EULAG dynamical core in COSMO: convective-scale Alpine weather forecasts
<p>The archive contains model output data for article "Compressible EULAG dynamical core in COSMO: convective-scale Alpine weather forecasts" to be published in Monthly Weather Review.</p> <p>The article presents the semi-implicit compressible EULAGas a newdynamical core for convective-scale<br> numerical weather prediction. The core is implemented within the infrastructure of the<br> operational model of the Consortium for Small Scale Modeling (COSMO), forming the NWP<br> COSMO-EULAG model (CE). This regional high-resolution implementation of the dynamical<br> core complements its global implementation in the Finite-Volume Module of ECMWF’s Integrated<br> Forecasting System. The paper documents the first operational-like application of the dynamical<br> core for realistic weather forecasts. After discussing the formulation of the core and its coupling<br> with the host model, the paper considers several high-resolution prognostic experiments over<br> complex Alpine orography. Standard verification experiments examine the sensitivity of the CE<br> forecast to the choice of the advection routine and assess the forecast skills against those of the<br> default COSMO Runge-Kutta dynamical core at the 2.2 km grid showing a general improvement.<br> The skills are also compared using satellite observations for a weak-flow convective Alpine weather<br> case-study, showing favorable results. Additional validation of the new CE framework for partly<br> convection-resolving forecasts using 1.1 km, 0.55 km, 0.22 km, and 0.1 km grids, designed to<br> challenge its numerics and test the dynamics-physics coupling, demonstrates its high robustness in<br> simulating multi-phase flows over complex mountain terrain, with slopes reaching 85 degrees, and<br> the flow’s realistic representation.</p>
MX Raster Data For Compression
<p>This data set, contains 6 raster experiment data sets, performed on and around a large lysozyme crystal sample using various beam intensities. These data are used to investigate several compressions (ratio and speed). </p> <p> </p>
Data for GECCO2023 Paper "Pareto Local Optimal Solutions Networks with Compression, Enhanced Visualization and Expressiveness"
<p><strong>Data for Paper "Pareto Local Optimal Solutions Networks with Compression, Enhanced Visualization and Expressiveness"</strong></p> <ul> <li><strong>instances.tar.xz</strong> contains 𝜌mnk-landscape instances</li> <li><strong>metrics.csv</strong> contains the (C)PLOS-net metric-values</li> <li><strong>performance.csv</strong> contains the performance of the different algorithms on each instance</li> <li><strong>merged.csv</strong> contains the merged data from the 2 csv files above</li> </ul> <p><strong>Reference</strong></p> <p>Arnaud Liefooghe, Gabriela Ochoa, Sébastien Verel, and Bilel Derbel. 2023. <strong>Pareto Local Optimal Solutions Networks with Compression, Enhanced Visualization and Expressiveness</strong>. In Genetic and Evolutionary Computation Conference (GECCO ’23), July 15–19, 2023, Lisbon, Portugal. ACM, New York, NY, USA, 9 pages. <a href="https://doi.org/10.1145/3583131.3590474">https://doi.org/10.1145/3583131.3590474</a></p> <p><strong>Abstract</strong></p> <p>The structure of local optima in multi-objective combinatorial optimization and their impact on algorithm performance are not yet properly understood. In this paper, we are interested in the representation of multi-objective landscapes and their multi-modality. More specifically, we revise and extend the network of Pareto local optimal solutions (PLOS-net), inspired by the well-established local optima network from single-objective optimization. We first define a compressed PLOS-net which allows us to enhance its perception while preserving the important notion of connectedness between local optima. We then study an alternative visualization of the (compressed) PLOS-net that focuses on good-quality solutions, improves the distinction between connected components in the network, and generalizes well to landscapes with more than 2 objectives. We finally define a number of network metrics that characterize the PLOS-net, some of them being strongly correlated with search performance. We visualize and experiment with small-size multi-objective nk-landscapes, and we disclose the effect of PLOS-net metrics against well-established multi-objective local search and evolutionary algorithms.</p>
Nanopore signal compression benchmark data in BLOW5 format
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Less is more: on-board lossy compression of accelerometer data increases biologging capacity
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Data from: Compression principle and Zipf’s law of brevity in infochemical communication
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Data from: Remnant salmon life history diversity rediscovered in a highly compressed habitat
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.