scholarly journals Accessible Spectrum Analyser

2016 ◽  
Author(s):  
Fiore Martin ◽  
Oussama Metatla ◽  
Nick Bryan-Kinns ◽  
Tony Stockman
Keyword(s):  
Spectral Analysis ◽  
Open Source ◽  
Design Patterns ◽  
Visually Impaired ◽  
Line Of Sight ◽  
Project Design ◽  
Frequency Spectra ◽  
Spectrum Analyser

This paper presents the Accessible Spectrum Analyser (ASA) developed as part of the DePic project (Design Patterns for Inclusive collaboration) at Queen Mary University of London. The ASA uses sonification to provide an accessible representation of frequency spectra to visually impaired audio engineers. The software is free and open source and is distributed as a VST plug-in under OSX and Windows. The aim of reporting this work at the ICAD 2016 conference is to solicit feedback about the design of the present tool and its more generalized counterpart, as well as to invite ideas for other possible applications where it is thought that auditory spectral analysis may be useful, for example in situations where line of sight is not always possible.

scholarly journals Compton-Thick AGN in the NuSTAR ERA VII. A joint NuSTAR, Chandra, and XMM-Newton Analysis of Two Nearby, Heavily Obscured Sources

2021 ◽  
Vol 922 (2) ◽  
pp. 159
Author(s):  
A. Traina ◽  
S. Marchesi ◽  
C. Vignali ◽  
N. Torres-Albà ◽  
M. Ajello ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Energy Range ◽  
Active Galactic Nuclei ◽  
Column Density ◽  
Galactic Nuclei ◽  
Seyfert Galaxies ◽  
Line Of Sight ◽  
Broad Energy Range ◽  
Larger Sample ◽  
Broad Energy

Abstract We present the joint Chandra, XMM-Newton, and NuSTAR analysis of two nearby Seyfert galaxies, NGC 3081 and ESO 565-G019. These are the only two having Chandra data in a larger sample of 10 low-redshift (z ≤ 0.05), candidates Compton-thick (CT) Active Galactic Nuclei selected in the 15–150 keV band with Swift-BAT that were still lacking NuSTAR data. Our spectral analysis, performed using physically motivated models, provides an estimate of both the line-of-sight (l.o.s.) and average (N H,S ) column densities of the two torii. NGC 3081 has a Compton-thin l.o.s. column density N H,z = [0.58–0.62] × 1024 cm−2, but the N H,S , beyond the CT threshold (N H,S = [1.41–1.78] × 1024 cm−2), suggests a “patchy” scenario for the distribution of the circumnuclear matter. ESO 565-G019 has both CT l.o.s. and N H,S column densities (N H,z > 2.31 × 1024 cm−2 and N H,S > 2.57 × 1024 cm−2, respectively). The use of physically motivated models, coupled with the broad energy range covered by the data (0.6–70 keV and 0.6–40 keV, for NGC 3081 and ESO 565-G019, respectively) allows us to constrain the covering factor of the obscuring material, which is C TOR = [0.63–0.82] for NGC 3081, and C TOR = [0.39–0.65] for ESO 565-G019.

scholarly journals Low-Cost Open Source Ultrasound-Sensing Based Navigational Support for the Visually Impaired

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3783 ◽  
Author(s):  
Petsiuk ◽  
Pearce
Keyword(s):  
Open Source ◽  
Visually Impaired ◽  
Vision Loss ◽  
Haptic Feedback ◽  
Low Cost ◽  
Poverty Line ◽  
Full Time ◽  
Distance Information ◽  
Point Distance ◽  
Navigational Support

Nineteen million Americans have significant vision loss. Over 70% of these are not employed full-time, and more than a quarter live below the poverty line. Globally, there are 36 million blind people, but less than half use white canes or more costly commercial sensory substitutions. The quality of life for visually impaired people is hampered by the resultant lack of independence. To help alleviate these challenges this study reports on the development of a low-cost, open-source ultrasound-based navigational support system in the form of a wearable bracelet to allow people with the lost vision to navigate, orient themselves in their surroundings and avoid obstacles when moving. The system can be largely made with digitally distributed manufacturing using low-cost 3-D printing/milling. It conveys point-distance information by utilizing the natural active sensing approach and modulates measurements into haptic feedback with various vibration patterns within the four-meter range. It does not require complex calibrations and training, consists of the small number of available and inexpensive components, and can be used as an independent addition to traditional tools. Sighted blindfolded participants successfully demonstrated the device for nine primary everyday navigation and guidance tasks including indoor and outdoor navigation and avoiding collisions with other pedestrians.

Developing Automated Spectral Analysis Tools for Interstellar Features Extractionto Support Construction of the 3D ISM Map

2017 ◽  
Vol 12 (S330) ◽  
pp. 243-244
Author(s):  
L. Puspitarini ◽  
R. Lallement ◽  
A. Monreal-Ibero ◽  
H.-C. Chen ◽  
H. L. Malasan ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Spatial Distribution ◽  
Spatial Resolution ◽  
Environmental Conditions ◽  
Equivalent Width ◽  
Global Analysis ◽  
Line Of Sight ◽  
Absorption Data ◽  
Diffuse Interstellar Bands ◽  
Automated Spectral Analysis

AbstractOne of the ways to obtain a detailed 3D ISM map is by gathering interstellar (IS) absorption data toward widely distributed background target stars at known distances (line-of-sight/LOS data). The radial and angular evolution of the LOS measurements allow the inference of the ISM spatial distribution. For a better spatial resolution, one needs a large number of the LOS data. It requires building fast tools to measure IS absorption. One of the tools is a global analysis that fit two different diffuse interstellar bands (DIBs) simultaneously. We derived the equivalent width (EW) ratio of the two DIBs recorded in each spectrum of target stars. The ratio variability can be used to study IS environmental conditions or to detect DIB family.

CONDUCTIVITY SPECTRA OF ROCKS FROM THE CRAIGMONT ORE ENVIRONMENT

Geophysics ◽  
1964 ◽  
Vol 29 (5) ◽  
pp. 832-847 ◽  
Author(s):  
D. C. Fraser ◽  
N. B. Keevil ◽  
S. H. Ward
Keyword(s):  
Spectral Analysis ◽  
Induced Polarization ◽  
Frequency Spectra ◽  
Specular Hematite ◽  
Conductivity Spectra

The conductivities of rocks of a suite from the Craigmont ore environment were studied as functions of frequency over the four decades 1,000 to 0.1 cps. The following were observed on a plot of linear conductivity vs log frequency. (1) Rocks mineralized with disseminated sulfides and magnetite yield low‐to‐moderate induced polarization (I.P.) and have conductivity‐frequency spectra which are concave‐up. (2) As veining increases, the spectra tend to straighten, and become sensibly straight when much of the metallics are interconnected; such rocks are characterized by low to large I.P. (3) Massive specular hematite cores yield a large I.P. and have spectra which are markedly concave‐up. For comparison, (4) clay‐containing sandstones yield low to moderate I.P. and have spectra which are slightly convex‐up. Consequently, the combination of I.P. magnitude and spectral analysis permits distinction of the various mineralization types.

scholarly journals MSBE Analysis with Frequency Spectra for Automated Identification of Epileptic Seizure

2019 ◽  
Vol 8 (12) ◽  
pp. 5869-5874
Keyword(s):  
Spectral Analysis ◽  
Seizure Detection ◽  
Detection Technique ◽  
Discriminative Power ◽  
Entropy Analysis ◽  
Analysis Method ◽  
Automated Identification ◽  
Frequency Spectra ◽  
Multi Scale ◽  
Spectral Analysis Method

Objective-This study introduces a reliable automated seizure detection technique based on MSBE (Multi scale bubble entropy) and frequency spectral analysis. Method- This paper aims to develop a novel seizure detection technique that incorporates AM FM model for decomposition of EEG into different sub bands. In our approach, integrated feature set is constructed using multi scale bubble entropy analysis at each sub band and frequency spectral analysis at each electrode. Result-In this paper, an application of bubble entropy with different frequency parameter such as PPF and PSD is provided in order to access its stable and outstanding performance on epileptic seizer detection. The experimental results show that classification accuracy is improved with this algorithm. These finding suggest that extracted features can be used for treatment of epilepsy. Significance- This method provides greater stability and discriminative power, so this technique could be used to detect wider range of seizures.

A General Framework to Detect Design Patterns by Combining Static and Dynamic Analysis Techniques

2021 ◽  
Vol 31 (01) ◽  
pp. 21-54
Author(s):  
Cong Liu
Keyword(s):  
Dynamic Analysis ◽  
Open Source ◽  
Design Pattern ◽  
Design Patterns ◽  
General Framework ◽  
Process Mining ◽  
Pattern Detection ◽  
Software Systems ◽  
Static And Dynamic Analysis ◽  
Analysis Techniques

Design pattern detection can provide useful insights to support software comprehension. Accurate and complete detection of pattern instances are extremely important to enable software usability improvements. However, existing design pattern detection approaches and tools suffer from the following problems: incomplete description of design pattern instances, inaccurate behavioral constraint checking, and inability to support novel design patterns. This paper presents a general framework to detect design patterns while solving these issues by combining static and dynamic analysis techniques. The framework has been instantiated for typical behavioral and creational patterns, such as the observer pattern, state pattern, strategy pattern, and singleton pattern to demonstrate the applicability. Based on the open-source process mining toolkit ProM, we have developed an integrated tool that supports the whole detection process for these patterns. We applied and evaluated the framework using software execution data containing around 1,000,000 method calls generated from eight synthetic software systems and three open-source software systems. The evaluation results show that our approach can guarantee a higher precision and recall than existing approaches and can distinguish state and strategy patterns that are indistinguishable by the state-of-the-art.

An open source tool for heart rate variability spectral analysis

2011 ◽  
Vol 103 (1) ◽  
pp. 39-50 ◽  
Author(s):  
L. Rodríguez-Liñares ◽  
A.J. Méndez ◽  
M.J. Lado ◽  
D.N. Olivieri ◽  
X.A. Vila ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Analysis ◽  
Open Source ◽  
Open Source Tool
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