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A designed, fabricated and tested electromagnetic bandgap (EBG) structure is proposed for resolving the problem of the lower cut-off frequency of conventional planar-type EBGs. Bandwidth enhancement is achieved by incorporating edge termination along the edges of the whole EBG-patterned power plane. Measurement results show that the lower cutoff frequency is shifted downwards from 800 to 13 MHz. This...
To analyse and compare physical unclonable function (PUF) concepts, a set of parameters should be defined to measure performance. The Hamming distance (HD) is a parameter to measure the number of different elements of two strings of the same length. In this reported research, weighted HD is proposed to evaluate and compare the performance of PUFs. The proposed parameter uses weights for calculating...
We studied the parameters that affect terahertz wave generation via optical rectification in nonlinear crystals. We used simulations based on one-dimensional propagation equations of Maxwell in GaAs to consider the effect of these parameters on conversion efficiency. In order to study the effect of nonlinear absorption, we used Drude-model.
Blood cell segmentation is a crucial part of many medical and laboratory procedures such as cell counting and blood cell disorder diagnosis. Among different types of blood cells, white blood cells are the most important clinically, as they suffer greatest from blood disorders. In this paper we propose a method for automatic segmentation of white blood cells nucleus. A distinctive function is used...
This paper describes the evolution of an especially designed sub sea Remotely Operated Vehicle (ROV) with dedicated electromagnetic flux leakage searching arm as a part of associated intelligent Non Destructive Testing arrangement, which is intended for inspecting the outer surface of large ship hull and floating production storage offloading (FPSO) platforms with complex shaped structures. Current...
Many methods are used for analyzing ECG signal to predict cardiac events. The most recent suggested method is T-wave alternans. TWA refers to beat-to-beat variations of T-wave. This alternans is used as a predictor of mortal arrhythmia and sudden cardiac death (SCD). In this paper, we presented a new time domain approach based on searching local maxima after S location. Using an adaptive threshold,...
ECG signal processing is one of the earliest challenges for scientists as a tool for cardiovascular assessment. T-wave, as a part of ECG signal, is produced by ventricular repolarisation and its orientation usually corresponds with that of the QRS complex. Inverted T-wave in some leads can be a sign of abnormality. In this work we proposed a real-time algorithm to detect the polarity and symmetry...
In this paper, we propose a novel method for detection and clustering of defects in ultrasound images based on rosette pattern and image processing techniques. The method employs rosette pattern to extract main features of the image and then according to rosette pattern properties, the extracted samples are mapped to a linear plane. In this step, by the use of image processing techniques, all of the...
Random number generators represent basic cryptographic primitives. They are widely used in modern security schemes including security protocols, computer security and password sources. In some algorithms (e.g. DSA) or protocols (e.g. zero-knowledge), random numbers are intrinsic to the computation [3]. In all these applications, strength of security depends greatly on the quality of randomness of...
Body surface potential mapping (BSPM) is a non-invasive functional imaging method for reconstructing electrophysiological information about the surface of the heart. BSPM provides more diagnostic information than the 12-lead ECG. De-noising body surface potential (BSP) signals would lead to more accurate BSPM patterns therefore better diagnosis for heart problems. For de-noising of body surface potential...
Unsupervised clustering is a powerful technique that can be used for distinguishing the real target from the false targets such as flares in the images formed by infrared sensors in missiles. The ISODATA is such an algorithm that could be used in infrared guided missiles detectors, since the algorithm itself computes the number of clusters or in other words the number of flares. Although the only...
In this paper an optimum wavelet for denoising applications based on signal to noise ratio (SNR) improvement is designed. The approach is based on searching for a wavelet basis that provides the best non linear approximation of a given signal. It is shown that such a basis will have the best wavelet denoising performance in the sense of signal estimation error. The performance of this method is studied...
In this paper an optimum wavelet for denoising and detection applications is designed. The approach is based on searching for a wavelet basis that provides the best non linear approximation of a given signal. It is shown that such a basis will have the best wavelet denoising performance in the sense of signal estimation error. In addition, such a wavelet can represent the signal more compactly with...
Watermark detection can be considered as an estimation problem in which the watermark sequence has to be estimated from a possibly distorted image. In this paper, we use wavelet threshold estimation for extraction of watermark sequence. The correlation matching is then used for checking for the presence of the watermark. It is shown that the performance of this method is superior to that of correlation...
The ever-growing demand to high-speed transmission of data has forced the designers to make faster and much more reliable circuits and systems for users. Among many of methodologies for data formats to be transmitted, the binary data is of great interest. There are various pulse code modulations (PCM) for transmission of binary data among which, non return to zero (NRZ) and return to zero (RZ) are...
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