In this paper, we suggest a general model for the fixed-valued impulse noise and propose a two-stage method for high density noise suppression while preserving the image details. In the first stage, we apply an iterative impulse detector, exploiting the image entropy, to identify the corrupted pixels and then employ an Adaptive Iterative Mean filter (AIM) to restore them. The filter is adaptive...

In order to make realistic simulations of the radio propagation mechanism in ultra-wide band channels, an appropriate model is usually needed. In this paper we give a new technique of modeling the impulse response of the 60 Ghz channel. This new approach is based on the spectral analysis of α-stable processes. Our new model present many advantages : firstly, the channel is characterized only by...

Liquid rocket engines with hydrogen peroxide and kerosene have the advantages of high density specific impulse, reliability, no ignition system. At present, cooling problem engines, especially regenerative cooling, has been little explored. In this study, a realizable k-epsilon turbulence model, discrete phase eddy dissipation concept 10-step 10-component reaction mechanism oxygen are used. The...

Moments of the impulse response are widely used for interconnect delay analysis, from the explicit Elmore delay (the first moment of the impulse response) expression, to moment matching methods which creates reduced order trans-impedance and transfer function approximations. However, the Elmore delay is fast becoming ineffective for deep submicron technologies, and reduced order transfer functi...

Balloon pops are convenient for probing the acoustics of a space, as they generate relatively uniform radiation patterns and consistent “N-wave” waveforms. However, the N-wave spectrum contains nulls which impart an undesired comb-filter-like quality when the recorded balloon pop is convolved with audio. Here, a method for converting recorded balloon pops into full audio bandwidth impulse respo...

Opposite to many other communication channels the powerline channel does not represent an additive white Gaussian noise (AWGN) environment; in the frequency range from some hundred kilohertz up to 20 MHz it is mostly dominated by narrow-band interference and impulsive noise. After a basic classification of the different types of noise the properties of background noise and narrow-band interfere...

In this paper, a morphological approach based on pixel connectivity is proposed for removing impulse noise in images. Impulse noise, also called the salt and pepper noise, usually occurs in dark and bright regions of the image and the presence of this noise degrades the visual quality of the image by affecting its texture and fine details. Our algorithm first identifies the noisy pixels in imag...

Exposing consumers to persuasive cues can cause them to make impulse purchases. Persuasive cues can be heuristic cue or systematic cue. Heuristic cue uses simple rules to process the information such as identity of the source or other non-content cues. Systematic cue emphasizes detailed processing of message content and uses messagerelevant content or arguments to assist in decision making. The...

A high specific impulse ion thruster (HiIsp-IT) operated at a voltage of 10 kV has been studied and the problems of direct ion impingement on the accelerating grid and of production and impingement of charge-exchange ions have been considered. In order to investigate these problems and to facilitate the design of HiIsp-IT grid systems, a three-dimensional particle simulation code (“igx”) that e...