Results 271 to 280 of about 822,192 (311)

Analyses of Sampling Disturbance of the Lunar Surface in Direct Push Sampling Method

IEEE Access, 2018
The study of direct push sampling characteristics forms the theoretical basis for deep sampling tool design. In this paper, a ground test of the direct push sampling was carried out to analyze three influencing factors: tube diameter; friction ...
Xingwen Gao, Deming Zhao
exaly   +3 more sources

Negative result of multi-frequency direct sampling method in microwave imaging

Results in Physics, 2019
A negative result of multi-frequency direct sampling method (DSM) for imaging small anomaly from scattering parameters in microwave imaging was exhibited.
Won-Kwang Park
exaly   +3 more sources

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Line Sampling for Direct Illumination

Computer Graphics Forum, 2016
Computing direct illumination efficiently is still a problem of major significance in computer graphics. The evaluation involves an integral over the surface areas of the light sources in the scene. Because this integral typically features many discontinuities, introduced by the visibility term and complex material functions, Monte Carlo integration is
Niels Billen, Philip Dutré
openaire   +1 more source

Adaptive direct illumination sampling

SIGGRAPH ASIA 2016 Posters, 2016
We present a new method for sampling direct illumination in scenes containing a large number of light sources. We divide a scene into cells and find a suitable clustering of the light sources for each of the cells. The clusters are then importance sampled based on their estimated contribution.
Petr Vévoda, Jaroslav Krivánek
openaire   +2 more sources

Sampling Jitter Cancellation in Direct-Sampling Radio

2010 IEEE Wireless Communication and Networking Conference, 2010
This paper addresses the sampling jitter estimation and cancellation task in direct RF sub-sampling type radios. The proposed jitter estimation method is based on carefully injecting or superimposing an additional known reference signal to the received signal at the sampler input. Proper digital signal processing methods are then devised and applied to
Ville Syrjälä, Mikko Valkama
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Imprecise sampling and direct decision making

Annals of Operations Research, 1998
In decision theory, uncertainty is generally modeled through probabilities or probabilityintervals. Data however, when collected by sampling, do not provide probabilities (resp.,lower/upper probabilities) but frequencies (resp., lower/upper frequencies).
Gonzales, Christophe, Jaffray, Jean-Yves
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Acoustic source direction by hemisphere sampling

2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002
A method for estimating the direction to a sound source, using a compact array of microphones, is presented. For each pair of microphones, the signals are prefiltered and correlated. Rather than taking the peak of the correlation vectors as estimates for the time delay between the microphones, all the correlation vectors are accumulated in a common ...
Stanley T. Birchfield, Daniel Kahn Gillmor   +1 more
openaire   +1 more source

Direct coarse sampling of electronic holograms

Optics Letters, 2003
We describe a series of experiments in order to test a new sampling criterion for wavefront reconstruction from a carrier-frequency signal as obtained in electronic holography. Both a Fourier-transform configuration and a Fresnel-zone form of a digital holographic microscope are described.
Kedar, Khare, Nicholas, George
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Behavioral modeling of direct sampling mixer

2011 IEEE International Symposium of Circuits and Systems (ISCAS), 2011
This paper presents a behavioral model of the direct sampling mixer (DSM) using MATLAB SIMULINK environment. The proposed model is integrated into a SIMULINK block with tunable parameters, which allows fast and convenient time domain simulations. Nonidealities, including transconductance nonlinearity, jitter effects and on-resistance thermal noise were
Huan Wang, Yun Pan, Xiaolang Yan, Ruohong Huan   +3 more
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Correlated visibility sampling for direct illumination

The Visual Computer, 2005
State-of-the-art importance sampling strategies for direct illumination take into account the importance of the incident illumination, as well as the surface BRDF. Hence, these techniques achieve low variance in unoccluded regions. However, the resulting images still have noise in partially occluded regions as these techniques do not take visibility ...
Abhijeet Ghosh, Wolfgang Heidrich
openaire   +1 more source