We propose an automatic and precise moving-object extraction method for use in video streams that can also be used for 3-D system applications. The method generates a statistical model for each pixel using several fra...
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We propose an automatic and precise moving-object extraction method for use in video streams that can also be used for 3-D system applications. The method generates a statistical model for each pixel using several frames, and then uses it to generate trimap images. After manually initializing a frame, unknown regions are automatically determined either background or foreground for the rest of frames. The key technology proposed is an adaptive training scheme, which estimates detection thresholds locally through the algorithm, followed by matting approaches using an iterative process and weighted statistical distance minimization. Experiments demonstrate outperformance of our method for both indoor and outdoor video streams, and also for 3-D modeling and representation.
An optical sub-sampling downconversion receiver for analog-to-digital conversion of narrowband high-frequency microwave signals is demonstrated. The measured SNDR in 2-MHz bandwidth at 40-GHz carrier frequency is 44 d...
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ISBN:
(纸本)9781557528599
An optical sub-sampling downconversion receiver for analog-to-digital conversion of narrowband high-frequency microwave signals is demonstrated. The measured SNDR in 2-MHz bandwidth at 40-GHz carrier frequency is 44 dB corresponding to 7-ENOB resolution.
Three-dimensional SiGe nanostructures grown on Si (SiGe/Si) using molecular beam epitaxy or low-pressure chemical vapor deposition exhibit photoluminescence and electroluminescence in the important spectral range of 1...
Inherent asymmetry in the tunneling barriers of few-electron quantum dots induces intrinsically different tunneling currents for forward and reverse source-drain biases in the nonlinear transport regime. We demonstrat...
Inherent asymmetry in the tunneling barriers of few-electron quantum dots induces intrinsically different tunneling currents for forward and reverse source-drain biases in the nonlinear transport regime. We demonstrate that in addition to spin selection rules, overlap matrix elements between many-body states are crucial for the correct description of tunneling transmission through quantum dots at large magnetic fields. Signatures of excited (N−1)-electron states in the transport process through the N-electron system are clearly identified in the measured transconductances. Overall, the computed current spectra are found to be in very good agreement with the experimental data.
The IEEE Transactions on Semiconductor Manufacturing awarded the 2006 Best Paper Award to T. Pfingsten and D.J.L. Herrmann for their paper, "Model-based design analysis and yield optmization."
The IEEE Transactions on Semiconductor Manufacturing awarded the 2006 Best Paper Award to T. Pfingsten and D.J.L. Herrmann for their paper, "Model-based design analysis and yield optmization."
This paper reports the performance of a fully-integrated planar electrospray thruster array. Electrospray thrusters work by electrostatically extracting and accelerating ions or charged droplets from a liquid surface ...
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ISBN:
(纸本)1563479036
This paper reports the performance of a fully-integrated planar electrospray thruster array. Electrospray thrusters work by electrostatically extracting and accelerating ions or charged droplets from a liquid surface to produce thrust. Emission occurs from sharp emitter tips, which enhance the electric field and constrain the emission location. Electrospray propulsion is desirable for its simplicity, high thrust efficiency and tunable specific impulse. However, the electrospray process limits the thrust from a single tip, so that achieving millinewton thrust levels would require an array with tens of thousands of emitters. We have used silicon batch microfabrication technology to make an array of 502 emitters in a 113 mm2 area. The thruster, weighing 5 g, was tested with the ionic liquid EMI-BF4. Time of night measurements show that the thruster operates in the ion-emission regime, which is most efficient for propulsion, with a specific impulse around 3000 s at a 1 kV extractor voltage. Emission starts as low as 500 V. Currents of 370 nA per emitter have been recorded at 1500 V, for an estimated thrust of 26 nN per emitter or 13 μN total, and a 275 mW power consumption. The thrust efficiency is estimated around 85%. In good operating conditions, the current intercepted on the extractor electrode is well below 1%, increasing to a few percent at the highest current levels.
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