Computer-mediated connections between human motor cortical neurons and assistive devices promise to improve or restore lost function in people with paralysis. Recently, a pilot clinical study of an intracortical neural interface system demonstrated that a tetraplegic human was able to obtain continuous two-dimensional control of a computer cursor using ...
PubMed Central
NASA Astrophysics Data System (ADS)
This study aims to explore whether human intentions to move or cease to move right and left hands can provide four spatiotemporal patterns in single-trial non-invasive EEG signals to achieve a two-dimensional cursor control. Subjects performed motor tasks by either physical movement or motor imagery. Spatial filtering, temporal filtering, feature selection and classification ...
PubMed
possible to display scalar, vector, and second-rank tensor quantities in ...... cursor are displayed in a Cartesian, cylindrical, or spherical coordinate system . ...... two-dimensional line equations for each edge of a triangle. ..... coordinates of the element centroids. If an element centroid is within ...
NASA Website
The patent application relates generally to a means for converting two-dimensional mechanical motion into control signals in digital form, and relates more specifically to a cursor control for use in conjunction with a cathode ray tube (CRT) display devic...
National Technical Information Service (NTIS)
The purpose of the current study was to evaluate the current and two alternative cursors for B-2 Synthetic Aperture Radar (SAR) imagery application and to recommend an alternative design. This study was conducted in response to problems crewmembers are experiencing with the current cursor on the B-2 SAR display. In particular, the design of the current ...
... order transitions. Our method gives accurate results for the two dimensional Ising model. (Author). Descriptors : *Transitions ...
DTIC Science & Technology
Aug 27, 1991 ... PROS had a problem with coordinates. If the image was blocked, the coordinates generated by cursor read-back appeared to be accurate to ...
Historically, two-dimensional airfoil or hydrofoil section characteristics have been obtained by measuring individually the lift, drag and pitching moment by the most accurate technique available. The use of force balances to measure the three quantities ...
Two-dimensional cursor control is an important and challenging issue in EEG-based brain-computer interfaces (BCIs). To address this issue, here we propose a new approach by combining two brain signals including Mu/Beta rhythm during motor imagery and P300 potential. In particular, a motor imagery detection mechanism and a P300 potential detection mechanism ...
... high resolution two-dimensional calculations of flatpack response to more accurately determine the mechanical state of the ytterbium foil inside the ...
The current study was performed to test two electronic cursor control devices (a Touchpad and a MicroJoystick) for use in an articulating powered laparoscopic tool. A simple target acquisition test was conducted to test how well the cursor control devices could be manipulated and how accurate they were (including endpoint and movement ...
To control a cursor on a monitor screen, a user generally needs to perform two tasks sequentially. The first task is to move the cursor to a target on the monitor screen (termed a two dimensional or 2-D cursor movement), and the second task is either to select a target of interest by clicking ...
Wind turbine performance and load predictions depend on accurate airfoil performance data. Wind tunnel test data are typically used which accurately describe two-dimensional airfoil performance characteristics. Usually these data are only available for a ...
This report combines two ideas from the basis of finite volume and finite element numerical methods to form a accurate discontinuous finite element solution for the two dimensional Euler equations.
Energy Citations Database
This study aims to explore whether human intentions to move or cease to move right and left hands can be decoded from spatiotemporal features in non-invasive EEG in order to control a discrete two-dimensional cursor movement for a potential multidimensional brain-computer interface (BCI). Five na�ve subjects performed either sustaining or stopping a ...
Brain-computer interface (BCI) systems are allowing humans and non-human primates to drive prosthetic devices such as computer cursors and artificial arms with just their thoughts. Invasive BCI systems acquire neural signals with intracranial or subdural electrodes, while noninvasive BCI systems typically acquire neural signals with scalp electroencephalography (EEG). Some ...
Brain�computer interface (BCI) systems are allowing humans and non-human primates to drive prosthetic devices such as computer cursors and artificial arms with just their thoughts. Invasive BCI systems acquire neural signals with intracranial or subdural electrodes, while noninvasive BCI systems typically acquire neural signals with scalp electroencephalography (EEG). Some ...
The CURSOR procedure is used to read the position of the interactive graphics cursor from the current graphics device. Note that not all graphics devices ...
A vectorized two dimensional beam breakup code, TDBBU, is used to simulate bunch dynamics in recirculating accelerators. First, the code is briefly described, including effects needed to accurately model the CEBAF accelerator. Next, various code test are sketched. Finally, the multipass beam breakup threshold current is determined to ...
DOE Information Bridge
The justification for three-dimensional versus two-dimensional simulations of non-symmetric armor penetration problems has been a topic of discussion for many years. Two-dimensional plane-strain approximations are generally not quantitatively accurate, es...
The latest research adopting software technology to improve pointing performance is through an Automatic Target Acquisition Program (ATAP), where the user can click on the mouse button when a dashed line is aimed at the desired target, instead of moving the cursor to the target. However, ATAP has one limitation--it cannot benefit from Mouseover effects because they only work ...
ERIC Educational Resources Information Center
A time-accurate potential-flow calculation method has been developed for unsteady incompressible flows through two-dimensional multi-blade-row linear cascades. The method represents the boundary surfaces by distributing piecewise linear-vortex and constan...
An accurate and efficient numerical method for the steady, two dimensional Euler equations is applied to study steady shock waves perpendicular to smooth, convex surfaces. The main subject of study is the flow near both ends of the shock waves. Some doubt...
Careful selection of the best diffraction geometry matched to the sample, with use of high resolution two-dimensional detectors and a mask integration procedure will allow the collection of statistically accurate data for many proteins and crystals with a...
Two-dimensional Boussinesq convection is studied numerically using two different methods: a filtered pseudospectral method and a high order accurate ENO scheme. The issue whether finite time singularity occurs for initially smooth flows is investigated. T...
This study assesses the capability of the planned NAVSTAR Global Positioning System (GPS) to meet civil navigation requirements. When it becomes operational in about 1983, NAVSTAR GPS will provide accurate two-dimensional and three-dimensional service to ...
The study assesses the capability of the planned NAVSTAR Global Positioning System (GPS) to meet civil navigation requirements. When it becomes operational in about 1988, NAVSTAR GPS will provide accurate two-dimensional and three-dimensional service to a...
2D measurement of human joint motion involves analysis of 3D displacements in an observer selected measurement plane. Accurate marker placement and alignment of joint motion plane with the observer plane are difficult. Alignment of the two planes is essen...
An accurate determination of the electromagnetic scattering cross section of many realistic targets must account for their being multi-dimensional and penetrable by the incident EM wave. An existing volume integral equation formulation of EM fields within...
Computer control of two-dimensional optical-imaging instrumentation and the collection, manipulation and storage of data from these devices provides an accurate means of rapidly characterizing spectroscopic emission sources. Spectrometric apparatus can be...
A time-accurate two-dimensional fluid code is used to compute test times in shock tubes operated at supersonic speeds. Unlike previous studies, this investigation resolves the finer temporal details of the shock-tube flow by making use of modern supercomp...
To deepen understanding and hasten the development of treatments, cancer needs to be modelled more accurately in vitro; applying tissue-engineering concepts and approaches in this field could bridge the gap between two-dimensional studies and in vivo animal models.
... function specified: Deletes the character before the cursor. Deletes the character the cursor is on.
We show here that a brain-computer interface (BCI) using electrocorticographic activity (ECoG) and imagined or overt motor tasks enables humans to control a computer cursor in two dimensions. Over a brief training period of 12-36 min, each of five human subjects acquired substantial control of particular ECoG features recorded from several locations over the same hemisphere, ...
We show here that a brain-computer interface (BCI) using electrocorticographic activity (ECoG) and imagined or overt motor tasks enable humans to control a computer cursor in two dimensions. Over a brief training period of 12-36 min, each of five human subjects acquired substantial control of particular ECoG features recorded from several locations over the same hemisphere, ...
Goal-directed movements performed in a virtual environment pose serious challenges to the central nervous system because the visual and proprioceptive representations of one's hand position are not perfectly congruent. The aim of the present study was to determine whether the vision of one's hand or upper arm, compared with that of a cursor representing the tips of one's index ...
The advection scheme developed in this study is a fully two-dimensional and nonoscillatory extension of the one-dimensional Crowley-type mass-conserving schemes. The fully two-dimensional scheme includes new cell-to-cell fluxes directed along the local flow direction, which explicitly treat the exchange of the transported variable between all neighboring ...
We propose and investigate a technique for generating smooth two-dimensional potentials for ultra-cold atoms based on the rapid scanning of a far-detuned laser beam using a two-dimensional acousto-optical modulator (AOM). We demonstrate the implementation of a feed-forward mechanism for fast and accurate control of the spatial intensity of the laser beam, ...
An accurate approach for reconstructing a time-dependent two-dimensional signal from non-synchronized time series recorded at points located on a grid is discussed. The method, denoted as correlation sampling, improves the standard conditional sampling approach commonly employed in the study of turbulence in magnetoplasma devices. Its implementation is ...
A pseudo two-dimensional collision probability method for calculating plate and pin cell flux distributions has been developed, tested against Monte Carlo calculations, and has been found to yield collision probabilities which are in error less than 2%. In both the plate and pin cell cases, the pseudo 2-D collision probability methods have been shown to be as ...
The ignition and growth concept of reactive flow in heterogeneous solid explosives is incorporated into a two-dimensional, finite element, Lagrangian code and used to model shock initiation and detonation wave propagation experiments on PBX 9404 and LX-17. The failure radii and corner turning abilities of detonating PBX 9404 and LX-17 are calculated. Two-dimensional shock ...
The quadrupolar and chemical shift tensors, as well as the relative orientation of the two principle axis systems, are accurately determined using a two-dimensional nuclear magnetic resonance technique. Good agreement between experimental and simulated two-dimensional spectra is obtained for a series of rubidium and sodium compounds at multiple magnetic ...
We present a method to solve the Helmholtz equation for a non-homogeneous membrane with Dirichlet boundary conditions at the border of arbitrary two-dimensional domains. The method uses a collocation approach based on a set of localized functions, called �little sinc functions�, which are used to discretize two-dimensional regions. We have performed ...
This report details the research and findings related to the Scanning Cursor Adaptability Study. The data herein pertains to the review of automated cartographic and scanning cursor programs, digitizing device vendors, the analysis of interface requiremen...
... this thesis was to evaluate the use of four-cursor buttons versus a ... based systems when technicians used a joystick or four-cursor button to display ...
Set the size of the frame. protected void, updateCursor() Update the World Window's cursor to the current resize cursor. ...
Neuroprosthetic devices such as a computer cursor can be controlled by the activity of cortical neurons when an appropriate algorithm is used to decode motor intention. Algorithms which have been proposed for this purpose range from the simple population vector algorithm (PVA) and optimal linear estimator (OLE) to various versions of Bayesian decoders. Although Bayesian ...
Digital radiographs obtained with a CT scanner were evaluated as an alternative to conventional pelvimetry. Dosimetry studies demonstrated an absorbed radiation dose of 22 mrad for each digital radiograph, approximately 3% of the dose for comparable standard radiographs. Distance measurements were accurately made on digital radiographs and axial CT sections by ...
... Title : GEOMETRIC DISTRIBUTION IN SOME TWO DIMENSIONAL QUEUING SYSTEMS. ... Abstract : The state of the system is a two dimensional ...
For the computation of nonlinear solutions of Hamilton-Jacobi scalar equations in two space dimensions, we develop high order accurate numerical schemes that can be applied to complicated geometries. Previously, the recently developed essentially nonoscillatory (ENO) technology has been applied in simple domains like squares or rectangles using dimension-by-dimension ...
