An experiment intended to determine the influence of the input data on the performance improvements resulting from program restructuring is described. This influence is found to be non-significant for the particular p...
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This paper presents the design optimization of a micromachined ring-type fluxgate sensor with localized saturation core to obtain low power consumption. The design optimization has been performed for finding a model w...
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This paper presents a new polymer lab-on-a-chip for magnetic immunoassay with fully on-chip sampling and detection capabilities, which provides a smart platform of magnetic immunoassay-based lab-on-a-chip for point-of...
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Reliability is a crucial issue in modern power systems, being, in simple words, the ability to continuously and efficiently supply loads without neglecting the quality of service while keeping the power grid stable. I...
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作者：
Kozen, DexterComputer Science Division
Department of Electrical Engineering Computer Sciences and the Electronics Research Laboratory University of California Berkeley United States
A new spirally-rolled polymer microtube has been proposed, fabricated and characterized for the smart microcatheter and cardiovascular in vivo monitoring in this research work. With this new microfabrication method, s...
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In the past few years, research has bee actively carried out in an attempt to improve the quality and reliability of large scale software systems. Although progress has been made on the formal proof of program correct...
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Moving cast shadows are a major concern for foreground detection algorithms. Processing of foreground images in surveillance applications typically requires that such shadows have been identified and removed from the ...
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ISBN:
(纸本)0769523722
Moving cast shadows are a major concern for foreground detection algorithms. Processing of foreground images in surveillance applications typically requires that such shadows have been identified and removed from the detected foreground. This paper presents a novel pixel-based statistical approach to model moving cast shadows of non-uniform and varying intensity. This approach uses the Gaussian mixture model (GMM) learning ability to build statistical models describing moving cast shadows on surfaces. This statistical modeling can deal with scenes with complex and time-varying illumination, and prevent false detection in regions where shadows cannot be detected. Gaussian mixture shadow models (GMSM) are automatically constructed and updated over time, are easily added to a GMM architecture for foreground detection, and require only a small number of parameters. Results obtained with different scene types show the robustness of the approach.
This paper describes some important improvements to the FDTD method. First, a two-dimensional FDTD algorithm for hybrid mode analysis is described. By using a phase shift of *** z along the z-direction for the limitin...
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This paper describes some important improvements to the FDTD method. First, a two-dimensional FDTD algorithm for hybrid mode analysis is described. By using a phase shift of *** z along the z-direction for the limiting case of Delta z --> 0, the propagation constant of hybrid modes can be calculated with only a two-dimensional mesh and a truly two-dimensional grid size. Second, a continuously variable grading scheme is introduced in which the first order error term is eliminated and a second order accuracy is achieved without using additional wave equations at the boundary of neighbouring lattices. This grading scheme can be applied to the 2D as well as to the 3D FDTD algorithm, Both developments represent important improvements in terms of computational efficiency of the FDTD method.
This paper investigates the impact of wavelength-dependent erbium-doped fiber amplifier (EDFA) gain spectrum on multichannel direct-detection lightwave transmission systems employing multiple amplifiers, An analysis i...
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This paper investigates the impact of wavelength-dependent erbium-doped fiber amplifier (EDFA) gain spectrum on multichannel direct-detection lightwave transmission systems employing multiple amplifiers, An analysis is presented which quantifies the constraints imposed by received power imbalance, signal-to-noise ratio (SNR), and receiver sensitivity on an EDFA cascade, Expressions are derived which relate the system constraints to the EDFA gain imbalance, bit rate, number of channels, and receiver dynamic range, Results demonstrate that when four-wave mixing (FWM) is compensated in an 11-channel system, received power imbalance can impose a significant constraint on transmission distance when the EDFA gain imbalance is greater than 1 dB or when bit rate is less than 1.8 Gb/s. In addition, performance of the preemphasis gain equalization technique is studied for multichannel systems employing APD or p-i-n/FET direct-detection optical receivers, Simple expressions are derived which can be used to quantify the increase in transmission distance obtained when employing preemphasis equalization, Results indicate that equalization of the received power spectrum can provide a two-to four-fold increase in the transmission distance when using APD receivers, compared to a one-to two-fold improvement with p-i-n/FET receivers, Analytic results are compared with results obtained by proven simulation methods [1] and found to be in good agreement.
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