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A method for separating and accurately estimating ADC noise, aperture jitter, and clock jitter is presented for ADC testing and characterization. This significantly relaxes clock jitter requirements and removes the need for high precision test instruments, but still allows ADC specifications like SNR, SNDR and ENOB to be accurately estimated.
An overview of ASKAP phased array feed (PAF) development is presented. New analytical and experimental techniques devised for ASKAP are described. Dedicated engineering test facilities are shown to be invaluable for system verification. Experience gained from PAF manufacture is compared with forecasts, and the importance of routine engineering demonstrated.
There is always noise inside the digital images. Noise is an unwanted component of the image. The existence of noise in a face image can degrade the accuracy of a face recognition. Therefore, we need a proper method that can cope noise or restore the quality of the image. The best method to overcome noise in the image is to use smoothing (filter). In this research, we discuss some techniques to overcome...
During a fault on the power grid, earthing systems operate to contain the energy keeping people and equipment safe. Unfortunately, these systems can fail and create hazards when the resistance is too high, as a result of improper design, installation or maintenance. Regular on-site testing of earthing grids is essential to prevent these situations. The most commonly used method to test earthing grids...
Testing analog and mixed-signal circuits is a costly task due to the required test time targets and high end technical resources. Indirect testing methods partially address these issues providing an efficient solution using easy to measure CUT information. In this work, the pass/fail test regions are encoded using octrees in the measure space. These octrees, generated in the training phase, will serve...
Multipactor, known as secondary electron resonant effect, is a high power RF breakdown phenomenon occurring in vacuum or near vacuum. A novel method for detecting multipactor in pulse mode is presented in this paper. This novel detecting method is implemented by adding an assistant carrier to create man-made intermodulation between the assistant carrier and modulation pulse in the same system. Theory...
Increased interest towards direct Device-to-Device (D2D) radio communication has led to questions about the validity of standardised Geometry-based Stochastic Channel Models (GSCMs). D2D sets new requirements to channel models due to the different usage scenarios and different propagation environments. This paper discusses extensions to GSCMs for fulfilling the new requirements such as dual-mobility,...
FID is the original fuzzy decision tree, first introduced almost twenty years ago, that sparked a huge variety of hybrid algorithms merging approximate reasoning, fuzzy systems, and mainstream classification algorithms. With the continued interest, this paper describes a newly released update 3.5. One important new addition is a module that can be used to study the effect of noise and missing values...
A method based on sparse denoising autoencoder for denoising hybrid noises in image is proposed in this paper. The method is experimented on natural images and the performance is evaluated in terms of peak signal to noise ratio (PSNR). By specifically designing the training process of sparse denoising autoencoder, our model not only achieves good performance on single kind of noises, but also is relatively...
A face recognition algorithm based on a newly developed Transform Domain Mutual Principal Component Analysis (TD-2D-MuPCA) approach is proposed. In this approach, the spatial facial two-dimensional images (2D) and their division into horizontal, vertical and diagonal sub-images halves are generated. The sub-image halves are processed using non-overlapping and overlapping windows. Each face and its...
Towards meeting the continued demand for higher performance in analog/RF ICs, the semiconductor industry has resorted to aggressive design styles. In conjunction with the increased variation of modern processes, aggressive design jeopardizes yield and, by extension, profitability of the design. In an effort to facilitate aggressive high-performance design without compromising production yield, modern...
EEG based biometric system can be used for authentication, with advantages like confidentiality retention and forgery prevention. Signals which are taken from maximum brain regions show some sort of unique information that can be used for extracting the subject dependent pattern. This paper presents an approach to find the relationships among signals generated in different brain regions which give...
As a promising automatic fault localization technique, Spectrum-Based Fault Localization (SBFL) has been proposed and widely studied for years, in which the effectiveness of risk evaluation formula is one of the most popular research topics. We have developed a framework to support the theoretical analysis of risk evaluation formulas, via subset relations. In this paper, we would like to further justify...
Improvement of classification accuracy is importance in data analysis problems. Enhancement of techniques have been proposed previously to address the problems as regard to classification performance, however, the issues of misclassification and noise elimination in the early stage of processing have been ignored by many researchers. If these problems were addressed, the performance of the classification...
In this paper, we proposed a region-based approach for indoor localization based on the fingerprint of radio signal strength (RSS). Unlike conventional fingerprint-based methods that based on point information to infer user's location, we used region information for indoor localization. Our results show that the proposed system has better positioning accuracy and more robustness to signal noise and...
Testing of image processing applications is a challenging job especially, when evaluating the correctness of output image. Generally, output images are evaluated manually by visual inspection carried out by an expert tester, which is the main hindrance in automation of testing process. Recently, statistical and metamorphic testing approaches are presented to automate output evaluation of image processing...
There have been considerable advances in multimedia recognition recently as powerful computing capabilities and large, representative datasets become ubiquitous. A fundamental assumption of traditional recognition techniques is that the data available for training are accurately labelled. Given the scale and diversity of web data, it takes considerable annotation effort to reduce label noise to acceptable...
We consider a search problem in which multiple targets are uniformly placed on the unit interval. An agent, who might not know the number of targets in advance, is interested in acquiring all targets to within some resolution δ as quickly as possible. To that end, at each time unit, the agent can probe any region of the unit interval for the presence of targets but the associated measurement noise...
An improved method of testing ADCs with a sine wave histogram is combined with an improved compression algorithm to accurately test the INL and DNL of ADCs. The accuracy of the compression algorithm is demonstrated with actual and simulated results. The role of THD and noise in the accuracy of the measurements is demonstrated. A previously reported method for reducing THD in an ac source is introduced...
Frequency drift is an important issue and is difficult to be avoided in ADC testing. The power leakage caused by frequency drift in the ADC output spectrum cannot be removed by conventional methods. This paper proposes a new algorithm which can estimate the ADC specifications accurately when there is frequency drift. The output of the ADC is collected as Ks segments. Phase correction is applied to...
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