Godfrey (1996, Journal of Econometrics 72, 275}299) has shown that the Glejser test for heteroskedasticity is valid only under conditional symmetry. Here, modi"cations of the Glejser test are suggested. The proposed test statistics are asymptotically valid even when the disturbances are not symmetrically distributed and can be used to test for heteroskedasticity when conditional location functi...

In this paper, new state of the art analog-to-digital converters (ADCs) testing techniques both static and dynamic are revised and discussed. Regarding the static test it is shown that a new technique based on the use of small triangular waves superimposed with a variable offset value as input signal, reduces dramatically the test duration. This histogram based technique can be implemented by u...

Background/Aim: Papillary neoplasia encompasses both malignant and benign lesions, core needle biopsy (CNB) is crucial in their diagnosis. Histological findings determine management. Here we compare volumetric apparent diffusion coefficient (ADC) histogram analysis of carcinomas pathologies identified by histopathology from excisional biopsies. Methods: This retrospective study included 524 pat...

Abstract. Applications for video data recorded with a setup of several cameras are currently attracting increasing interest. For such multi-view sequences, efficient coding is crucial to handle the enormous amount of data. However, significant luminance and chrominance variations between the different views, which often originate from imperfect camera calibration, are able to reduce the coding ...

One of the most practical routine tests for convergence of a positive series makes use of the ratio test. If this test fails, we can use Rabbe's test. When Rabbe's test fails the next sharper criteria which may sometimes be used is the Bertrand's test. If this test fails, we can use a generalization of Bertrand's test and such tests can be continued innitely. For simplicity, we call ratio test,...

The embedding capacity of a histogram-based reversible data hiding technique is primarily determined by the peak height of the histogram. Recently, some studies have tried to embed data in the histogram of prediction errors by modifying the error values and have better embedding efficiency. However, these methods offer no selective embedment mechanism to exclude the positions where the modifica...

chest radiography is a common diagnostic imaging test, which contains an enormous amount of information about a patient. however,its interpretation is highly challenging. the accuracy of the diagnostic process is greatly influenced by image processing algorithms;hence enhancement of the images is indispensable in order to improve visibility of the details. this paper aims at improving radiograp...

Previous approaches for modulation spectrum equalization were evaluated only for the Aurora 2 small vocabulary task. We further apply these approaches on the Aurora 4 large vocabulary task. In the spectral histogram equalization (SHE) approach, we equalize the histogram of the modulation spectrum for each utterance to a reference histogram obtained from clean training data. In the magnitude rat...