scholarly journals Asynchronous non-invasive high-speed BCI speller with robust non-control state detection

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Sebastian Nagel ◽  
Martin Spüler
Keyword(s):  
High Speed ◽  
Non Invasive ◽  
State Detection ◽  
Control State

scholarly journals Asynchronous non-invasive high-speed BCI speller with robust non-control state detection

2018 ◽  
Author(s):  
Sebastian Nagel ◽  
Martin Spüler
Keyword(s):  
Information Transfer ◽  
High Speed ◽  
Brain Activity ◽  
Real Life ◽  
Fixed Time ◽  
Intentional Control ◽  
Non Invasive ◽  
Information Transfer Rate ◽  
State Detection ◽  
Control State

Brain-Computer Interfaces (BCIs) enable users to control a computer by using pure brain activity. Recent BCIs based on visual evoked potentials (VEPs) have shown to be suitable for high-speed communication. However, all recent high-speed BCIs are synchronous, which means that the system works with fixed time slots so that the user is not able to select a command at his own convenience, which poses a problem in real-world applications. In this paper, we present the first asynchronous high-speed BCI with robust distinction between intentional control (IC) and non-control (NC), with a nearly perfect NC state detection of only 0.075 erroneous classifications per minute. The resulting asynchronous speller achieved an average information transfer rate (ITR) of 122.7 bit/min using a 32 target matrix-keyboard. Since the method is based on random stimulation patterns it allows to use an arbitrary number of targets for any application purpose, which was shown by using an 55 target German QWERTZ-keyboard layout which allowed the participants to write an average of 16.1 (up to 30.7) correct case-sensitive letters per minute. As the presented system is the first asynchronous high-speed BCI speller with a robust non-control state detection, it is an important step for moving BCI applications out of the lab and into real-life.

High-speed non-invasive measurement of tibial rotation during the impact phase of running

Ergonomics ◽  
2005 ◽  
Vol 48 (11-14) ◽  
pp. 1623-1637 ◽  
Author(s):  
C. J. Digby ◽  
M. J. Lake ◽  
A. Lees
Keyword(s):  
High Speed ◽  
Tibial Rotation ◽  
Non Invasive ◽  
Impact Phase ◽  
The Impact ◽  
Invasive Measurement

Non-invasive pre-lens tear film assessment with high speed videokeratoscopy

2018 ◽  
Vol 41 ◽  
pp. S77
Author(s):  
Clara Llorens-Quintana ◽  
D. Robert Iskander
Keyword(s):  
High Speed ◽  
Tear Film ◽  
Non Invasive

scholarly journals Preventing myocardial infarction: use and limitation of non-invasive imaging modalities

2020 ◽  
Vol 22 (Supplement_E) ◽  
pp. E110-E112
Author(s):  
Gian Piero Perna
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Cardiovascular Prevention ◽  
Additional Contribution ◽  
Essential Information ◽  
Non Invasive ◽  
Asymptomatic Patients ◽  
Coronary Events ◽  
Artery Disease ◽  
Definition Of

Abstract Identifying patients at high risk of coronary events is the main focus of cardiovascular prevention. For primary prevention score and risk cards are very low cost solutions, but only of limited efficacy, thus justifying the use of non-invasive imaging testing for the purpose of increasing the ‘diagnostic gain’. Considering all the diagnostic tests employed, only few demonstrated significant additional contribution to the risk score stratification. Coronary imaging with high speed volumetric computed tomography can provide essential information in ruling out and/or definition of coronary artery disease but also has limitations as far as the biological risk, the costs, and the difficulties of putting into perspective the results obtained in asymptomatic patients.

Future Trends in Coronary CT Angiography

2011 ◽  
pp. 360-366
Author(s):  
George D. Giannoglou ◽  
Sotirios A. Katranas
Keyword(s):  
High Speed ◽  
Coronary Ct Angiography ◽  
Multislice Ct ◽  
Calcium Score ◽  
Non Invasive ◽  
Coronary Ct ◽  
Endothelial Shear Stress ◽  
Artery Disease ◽  
Anomalous Coronary ◽  
Anomalous Coronary Arteries

Coronary computed tomography angiography (CCTA) is surrounded by the safety non-invasive methods offer and the advantages of high speed that multislice CT is associated with. While calcium score and recognition of anomalous coronary arteries are acceptable applications, CCTA reveals new fields of research on coronary artery disease, including lumen, bypass grafts, and stents patency, as well as endothelial shear stress and coronary stiffness measurements.

Non-invasive high-speed blinking kinematics characterization

2020 ◽  
Vol 258 (12) ◽  
pp. 2701-2714 ◽  
Author(s):  
V. Sanchis-Jurado ◽  
Cristian Talens-Estarelles ◽  
J. J. Esteve-Taboada ◽  
Á. M. Pons ◽  
S. García-Lázaro
Keyword(s):  
High Speed ◽  
Non Invasive

scholarly journals Assessing the Influence of Buried Archaeology on Equine Locomotion Comparison with Ground Penetrating Radar Results

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2938
Author(s):  
Neil Linford ◽  
Russell MacKechnie-Guire ◽  
May Cassar
Keyword(s):  
Ground Penetrating Radar ◽  
High Speed ◽  
Geophysical Survey ◽  
Archaeological Remains ◽  
Video Capture ◽  
Diverse Range ◽  
Non Invasive ◽  
Artificial Surface ◽  
Measurement Units ◽  
Ground Penetrating

The aim of this trial project was to identify whether buried archaeological remains may have an influence on equine locomotion, through comparison with a non-invasive Ground Penetrating Radar (GPR) survey. This study was conducted at the world-renowned Burghley Horse Trials site, near Stamford, City of Peterborough, U.K. that has a diverse range of heritage assets throughout the wider park land centred on the Grade 1 listed Elizabethan Burghley House. The initial aim of the research was to first use geophysical survey to identify and characterise archaeological remains, and then to determine a suitable location to conduct an equine locomotion study. This trial was conducted with five event type horses with their gaits recorded through the use of three axis, wireless, Inertial Measurement Units, and high speed video capture. It was hoped that this study might indicate an association between the presence of well preserved archaeological remains and changes in the gait of the horses, similar to those shown by studies of dressage horses over different riding surfaces. The results from the equine locomotion study did demonstrate a correlation between the presence of surviving archaeological remains and the alteration in the horses’ gait and, although this is only a preliminary study, the results may well be of interest during the design and construction of equine event facilities. Geophysical survey could, for example, be considered during the design of new or alteration to existing equine courses to allow some mitigation in the location of the course with respect to any archaeological remains, or through the appropriate use of a protective artificial surface.

scholarly journals Non-Invasive Detection of Vortex Street Cavitation

2017 ◽  
Vol 21 (2) ◽  
Author(s):  
Francisco  Botero ◽  
Adriana Milena Castro Peralta
Keyword(s):  
High Speed ◽  
Vortex Street ◽  
High Speed Photography ◽  
Laser Vibrometer ◽  
Angle Of Incidence ◽  
Vortex Generation ◽  
Non Invasive ◽  
Statistical Indicator ◽  
Cavitation Tunnel ◽  
Airborne Noise

<p><strong><em>Objective:</em></strong> This paper introduces a methodology for the non-intrusive detection of von Kármán vortex street cavitation. It is based on the cyclostationary analysis of the airborne noise radiated by the collapsing bubbles.</p><p><strong><em>Materials and methods:</em></strong> A hydrodynamic profile is mounted in the test section of a high-speed cavitation tunnel and the phenomenon is reproduced under controlled conditions of flow and pressure. The angle of incidence is kept constant. Flow velocity is varied to regulate the vortex generation frequency and pressure is adjusted to control the cavitation onset. High-speed photography is used to confirm the occurrence of cavitation in the core of the vortices. A laser vibrometer pointing to the upper surface of the profile validates the fluid-structure interaction due to the vortex shedding. A microphone is used to sense the sound produced by the phenomenon and transmitted to the environment.</p><p><strong><em>Results and discussion:</em></strong> The cyclic coherence showed out uncoupled evidence of the periodic detachment of vortices and the presence or absence of cavitation in their cores, reaching values close to 0.7 for specific frequencies.</p><p><strong><em>Conclusion:</em></strong> A non-intrusive monitoring approach along with a statistical indicator were implemented to allow the diagnosis of such phenomena.</p>

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