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116 results for “physical systems”
BRAIN Journal-Brain signal analysis using EEG and Entropy to study the effect of physical and mental tasks on cognitive performance-Figure 1. The 10-20 international system electrode placement showing the EEG electrode placement
<p>For the EEG analysis, the average power in the theta band (4 – 8 Hz), and alpha band (8 – 12<br> Hz) were computed at the frontal and parietal electrodes Fz and Pz respectively. Next, the ratio of<br> these two powers was determined, and named the ‘cognitive ratio’ as several researchers found that<br> the fronto-parietal network play important roles in cognitive activities.</p>
Data sets for "MELISSA: System description and spectral features of pre‐ and post‐midnight F‐region echoes. Journal of Geophysical Research: Space Physics" by Rodrigues et al.
<p>Observations used in the study "Rodrigues, F. S., Zhan, W., Milla, M. A., Fejer, B. G., de Paula, E. R., Neto, A. C., et al ( 2019). MELISSA: System description and spectral features of pre‐ and post‐midnight <em>F</em>‐region echoes. <em>Journal of Geophysical Research: Space Physics</em>, 124. <a href="https://doi.org/10.1029/2019JA027445">https://doi.org/10.1029/2019JA027445</a>."</p> <p>The uploaded files include the RTI maps measured by the MELISSA radar system between 2014 and 2018 (.tif files). They also include values of SNR versus local time and height and the spectra presented in the manuscript (.mat files).</p> <p>Please, see README.txt for additional details.</p>
Data set of paper Model-Driven System-Performance Engineering for Cyber-Physical Systems
<p>This data set contains the raw and processed data of the paper <em>Model-Driven System-Performance Engineering for Cyber-Physical Systems</em>, published in the proceedings of ESWEEK’21.</p>
DS4. Experimental evaluation of the TERAWAY physical layer system, implementing optical injection locking and optical beamforming, using bulk components
<p>This set comprises experimental results from the performance evaluation of the TERAWAY system in the physical layer, implementing bulk components. This performance evaluation focused on the optical generation of millimeter-wave signals implementing injection locking technique by means of inserting an optical frequency comb into the reference optical laser source, the fiber transmission of the optical signals, as well as the processing of this signal via an optical beamforming network.</p> <p>The data set consists of multiple waveforms that correspond to 16-QAM electrical signals of 500 MBaud symbol rate, at a central frequency of 60 GHz. These waveforms were obtained directly after the photodetection stage that consists of two high-speed photodetectors in order to emulate an optical beamforming scenario. The set is separated into different folders that correspond to the injection-locked and unlocked scenarios, both in back-to-back configuration and after a 25 km transmission of the signal through an optical fiber. Each folder contains the waveforms of the electrical signals, as they were generated at the photodetection stage, under various optical power values.</p>
philip928lin/Flood-Risks-of-Cyber-physical-Attacks-in-a-Smart-Storm-Water-System: Flood Risks of Cyber-physical Attacks in a Smart Storm Water System
<p>This is the code archive for the publication "Flood Risks of Cyber-physical Attacks in a Smart Storm Water System" in Water Resources Research.</p>
Inconsistency Situations in Engineering of Cyber-Physical Systems
<p>This dataset provided describes inconsistency situation descriptions in the Engineering of Cyber-Physical Systems found in industry environments. It includes 19 situations from 17 industry participants. The participants are mostly from automotive engineering, but also special machine construction and production automation are represented as industries. The 9 involved companies equaly represent Original Equipment Manufacturers (OEM) and Tier-1 suppliers. This dataset will be extended within our future work.</p>
[dataset] Runtime Equilibrium Verification for Resilient Cyber-physical Systems
<p>This package contains the <strong>raw data</strong> and <strong>scripts</strong> used to carry out the evaluation of the framework RUNE<sup>2</sup> (RUNtime Equilibrium verification and Enforcement).</p> <p>This package is paired with the following paper submitted for publication to the ACM Transactions on Autonomous and Adaptive Systems (TAAS). Invited contribution to the IEEE ACSOS 2021 Special Issue.</p> <p><strong>Title</strong>: Enforcing Resilience in Cyber-physical Systems via Equilibrium Verification at Runtime</p> <p><strong>Authors</strong>:<br> - Matteo Camilli, Free University of Bozen-Bolzano, Italy<br> - Raffaela Mirandola, Politecnico di Milano, Italy<br> - Patrizia Scandurra, University of Bergamo, Italy</p> <p>See README.md for further instructions.</p>
Physical Features for my study on Automatic Seismic Event Classification System in Pacific Northwest (Origin time - 50, +100)
<p>These features used the revised version of the feature extraction code. The revision involves changing the envelope filtering options and some minor modifications. </p>
Perspectives of Persons with Physical Impairments: Issues of Accessibility of Transportation Systems for Effective Inclusion in the English-Speaking Regions of Cameroon
<p>The paper investigated the adaptation for accessibility of transportation systems for effective inclusion of persons with physical disabilities in the English- speaking regions of Cameroon. Specifically, the article seeks to find out the impact of priority seating arrangement, the impact of audio-visual tactile information service, the impact of accessible parking and the provision of emergency evacuation plans on effective inclusion of persons with physical disabilities in the English-Speaking Regions of Cameroon. Literature was reviewed conceptually, theoretically and empirically. Using exploratory research design, the study sample 12 persons with physical disabilities, using an interview guide and observational check-list. Therefore, the study made use of qualitative data. The qualitative data was analyzed thematically, using themes and sample quotations. The findings showed that the current priority seating system in public transportation within the participants' community fails to provide an inclusive and accessible experience for individuals with physical, visual, and hearing impairments. Also, the findings from this research indicate that the lack of accessible and inclusive audio-visual tactile information in the public transportation systems of the English-Speaking Regions of Cameroon presents significant barriers to the full and equal participation of persons with physical disabilities. Moreover, the results of this study show that accessible parking impact effective inclusion of persons with physical disabilities in the English-Speaking Regions of Cameroon. Finally, the findings indicate a concerning lack of adequate emergency evacuation plans and procedures that consider the needs and safety of individuals with physical disabilities in the transportation infrastructure of the region. It was therefore, concluded that the adaptation for accessibility of transportation systems had a high effect on the inclusion of persons with physical disabilities in the English- speaking regions of Cameroon. Based on this, it is suggested thattransport providers should enhance the Priority Seating System; implement clear and visible markings for priority seating areas in public transportation vehicles, ensure that priority seating is designed with the specific needs of individuals with physical, visual, and hearing impairments in mind, such as providing adjustable and ergonomic seating options and develop and enforce policies that mandate the proper use of priority seating and promote a culture of respect and awareness among passengers.</p>
Online Package for the manuscript "Continuous Integration and Delivery for Cyber-Physical systems: A Grounded-Theory"
<p>This package contains the material of the (grounded theory) study related to the paper</p> <p>"Continuous Integration and Delivery for Cyber-Physical systems: A Grounded-Theory"</p> <p>The content of the various files and directories is detailed in the following.</p> <p>InterviewStructure.pdf: complete interview structure (the paper reports an overview in Table 1)</p> <p>open_coding/: this directory contains details from the open coding procedure. In particular:<br> - AllCodesUsedWhileCodingAndMapping.csv contains the list of all codes generated during the open coding, with a symbol near each one (first column) then used to compute the inter-rater agreement<br> - first_round.csv, second_round.csv, third_round.csv, fourth_round.csv: files used to compute the inter_rater agreement</p> <p><br> CodesContributingToMindMap.csv: final set of codes, that contributed to the taxonomy (see below)</p> <p>FinalCodingTraceability.csv: this file describes how the final set of codes is traced onto the ten interviews. Note that, at this stage, the transcripts have been redacted for confidentiality purposes.</p> <p>MindMap_Complete.pdf: complete taxonomy of codes, in the form of a mind map. The one reported in the paper (Figure 2) cuts leaves, unless (as for benefits, for example) they are necessary to properly describe and understand the category. Also, note that the complete mind map separates the benefits into "actual" and "expected" (based on what was collected from the interviews) whereas the summary mindmap shown in the paper (Figure 2) does not make this distinction.</p> <p>6C_Diagrams/ : This directory contains the detailed 6C diagrams (i.e., each box related to a "C" contains the list of codes pertaining to it) for the three dimensions investigated in the paper and addressed in RQ1, RQ2, and RQ3.</p>
The giant clam photosymbiosis is a physically optimized photoconversion system for the most intense sunlight on Earth
<p>Giant clams are photosymbiotic with unicellular algae ("zooxanthellae") organized in the clam's mantle tissue. This tissue has an especially low albedo for a photosynthetic system, generally less than 10\% at all visible wavelengths. This efficient absorbance of light occurs in the ecological context of the high solar irradiances in intertidal habitats near the equator. At these light levels, photosynthetic systems typically adapt to absorb less light in order to prevent radiative damage to chloroplasts. Giant clams are therefore unusual. If the giant clam photosymbiosis proves to be simultaneously efficient at absorption and at phototransduction at these irradiances, they are potentially remarkably productive and an important source of bioinspiration. We showed previously that the clams organize algae into vertical pillars in the mantle tissue. The clams' iridocytes, or optically structured skin cells on the surface of the tissue, then function to evenly distribute incoming solar irradiance along the vertical faces of the pillars. The result is that zooxanthellae in the system absorb solar power at lower rates than that of incoming solar flux. The overall energetic performance of this phtooconversion scheme has, however, been difficult to characterize given the complex three-dimensional structure and the fact that it is coupled to a much more voluminous, respiring animal. Here we use a combination of photochemical characterization and new quantitative modeling of data from the literature to estimate the photochemical efficiency as a function of incoming irradiance of the initial electron-transfer events. Our approach is to consider the clam mantle tissue in isolation as a meta-material for photoconversion. To do this, we developed a method to directly measure the system's photochemical efficiency with spatial resolution of 10's of microns using optical microprobes threaded through the tissue. These experimental efficiency data then serve as ground-truthing for a subsequent reanalysis of photosynthesis-irradiance curves of clams taken from the literature. For this quantitative re-analysis, we incorporated the clam system's quantum efficiency as a function of irradiance per cell into a Monte Carlo model of radiative transfer among cells to find the tissue's area-specific oxygen evolution apart from any sinks. We found that cells located within the dense clam system had fluorescence transients (i.e., Kautsky curves), a direct measure of the efficiency of PS II) that were very slow and of low intensity, particularly for a dense system, consistent with photochemical efficiencies generally greater than 50\% and often greater than 90\%. When incorporated into a larger computational model, we found that mature Tridacnid clams can efficiently perform photoconversion of light energy into chemical energy at light intensities many times more intense than the maximum time-averaged environmental radiance, or even the solar constant. The intensities to which the clam is adapted, however, can be found in strong wave-lensed pulses of irradiance that are characteristic of the clams' habitats. This surprising result makes sense if the system has evolved to both avoid damage from and utilize the power in the intense pulses of light that result from wave-lensing. Our model predicts that by evolving to compensate for the intense pulses of solar energy produced by wave-lensing, the clam system can perform photochemical conversion of radiation at intensities many times greater than the solar constant at around 90\% quantum efficiency. This result in turn suggests a strategy for organic, engineered materials performing photoconversion under solar concentration.</p>
Data from: Highlighting potential physical and chemical cues involved in conspecific recognition system in a predator nematode, Seinura caverna
<p class="MsoNormal"><span>Conspecific recognition is the ability to distinguish and respond to individuals of the same species. In nematodes, this behavior can mediate aggregation, feeding behavior, or mating. Here, we investigated whether and how the predatory nematode <em>Seinura caverna</em> recognizes and avoids conspecifics to prey on. In predation assays, <em>S. caverna</em> did not kill conspecifics, but killed nematodes of three heterospecific species. Interestingly, <em>S. caverna</em> did not kill <em>Ektaphelenchoides</em> <em>spondylis</em> nematodes. <em>S. caverna</em> did not eject its stylet when encountering conspecifics or <em>E. spondylis</em>. The characterization of the internal cuticle structure of 13 nematode species suggested that the cuticle may play a role in the preying decision, as <em>E. spondylis</em> and <em>S. caverna</em> exhibited similar, type III, cuticle layers. Chemical extracts from <em>S.</em> <em>caverna</em> further repelled conspecifics. We discuss the potential hierarchical use of physical and chemical cues in <em>S. caverna</em> predation behavior and provide insights into the evolutionary adaptations and behavior of this organism. </span></p>
data set for Design of architectural environment integration of cyber-physical systems based on image segmentation and retrieval technology
<p>This data set is used to implement the project Design of architectural environment integration of cyber-physical systems based on image segmentation and retrieval technology</p>
Generalised Kerr Microcomb Physics in Synchronously Driven Systems: Thesis Simulation Programs
<p>This depot inludes Matlab programs and functions for many of the figures and examples presented in the 2023 thesis of Miles H. Anderson from EPFL. Every script file is intended to be runable as is. The programs are tested with Matlab 2020b, and some of them make use of the Signal Processing package.</p> <p>A guide on the program structure is given in the Appendix chapter of the thesis, which accompanies the example programs found in the Appendix Demos folder.</p> <p>Each main folder corresponds to a chapter in the thesis.</p> <p>Some of the programs might contain errors and unexplained sections. Earnest inquiries about the programs might be answered by Miles at his email: miles.anderson@epfl.ch.</p> <p>Supervisor: Prof. Tobias J. Kippenberg, Laboratory of Photonic and Quantum Measurements (LPQM) at EPFL.</p>
Dataset for the SIAM MPI23 project "Model inversion for complex physical systems using low-dimensional surrogates"
<p>This dataset contains 20,000 synthetic simulations of a simplified two-dimensional confined aquifer model of the Hanford Site. The inputs are the Kosambi-Karhunen-Loève expansion (KKLE) coefficients of the input log-transmissivity field. The outputs are the corresponding stationary pressure responses observed at 323 observation wells. Also included are the arrays necessary to reconstruct the log-transmissivity inputs from the KKLE coefficients.</p>
Replication package of "How Do Deep Learning Faults Affect AI-Enabled Cyber-Physical Systems in Operation? A Preliminary Study Based on DeepCrime Mutation Operators"
<p>Cyber-Physical Systems (CPSs) combine digital cyber technologies with physical processes. As in any other software system, in the case of CPSs, the use of Artificial Intelligence (AI) techniques in general, and Deep Neural Networks (DNNs) in particular, is contantly increasing. While recent studies have considerably advanced the field of testing AI-enabled systems, it has not yet been investigated how different Deep Learning (DL) bugs affect AI-enabled CPSs in operation. This work-in-progress paper presents a preliminary evaluation on how such bugs can affect CPSs in operation by using a mobile robot as a case study system. For that, we generated DL mutants by using operators proposed by Humbatova et al., which are operators based on real-world DL faults. Our preliminary investigation suggests that such bugs are more difficult to detect when they are deployed in operation rather than when testing their DNN in an off-line setup, which contrast with related studies.</p> <p> </p> <p>This repository provides the replication data employed in our study.</p>
Artifact Demonstration Video for Negotiating Autonomy in Cyber-Physical Systems at Run Time
<p>This artifact demonstration video shows a novel approach to dynamically negotiate autonomy in Cyber-Physical Systems (CPS). As CPS become increasingly integrated into our daily lives, sharing autonomy between human operators and autonomous agents within these systems becomes a critical issue. Business case developers also face the design and integration of CPS. Our research presents a novel architecture and methodology that seamlessly enables this sharing of autonomy. We aim to encourage business case developers to consider autonomic CPS. The video provides an insightful overview of our approach and highlights its practicality. It illustrates how our system enables business case developers to back CPS with a mechanism to negotiate and share autonomy at runtime. Our artifact demonstration video is not only a good opportunity to visually grasp the concept of negotiating autonomy in CPS, but also to experience the practical implementation of this approach. It serves as a valuable resource for researchers, engineers, and anyone interested in understanding the future of sharing autonomy in the context of cyber-physical systems.</p>
The JustWalk JITAI Study: A System Identification Experiment to Understand Just-in-Time States of Physical Activity
ClinicalTrials.gov study NCT05273437. IPD Sharing: Not stated. Countries: 1. Publications: 4.
Data from: Highlighting potential physical and chemical cues involved in conspecific recognition system in a predator nematode, Seinura caverna
Open the record for dataset details and reuse information.
The giant clam photosymbiosis is a physically optimized photoconversion system for the most intense sunlight on Earth
Open the record for dataset details and reuse information.
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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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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.