Zachariah C. Alex

Learn More
This paper presents a multi-fractal antenna operating in ultra wide band range for WLAN and WiMAX applications. The novel idea of multi-fractal geometry is introduced into the conventional triangular patch antenna with microstrip feed. The addition of Koch and Sierpinski fractal techniques gives rise to better impedance bandwidth and return loss(More)
This review paper focuses on the neonatal brain segmentation algorithms in the literature. It provides an overview of clinical magnetic resonance imaging (MRI) of the newborn brain and the challenges in automated tissue classification of neonatal brain MRI. It presents a complete survey of the existing segmentation methods and their salient features. The(More)
This paper provides an overview of magnetic resonance imaging of the neonatal brain, presents the challenges involved in segmenting the neonatal brain images and reviews the existing techniques for automatic segmentation, including atlas-based probabilistic segmentations and morphology based brain segmentation. It compares the various methods in practice(More)
— The paper presents the design and performance measures of a printed stepped patch monopole antenna with semi-elliptical ground plane and band notch for ultra wideband applications. The proposed antenna operates in the frequency range 3.15 ~ 12.2 GHz with average gain of 4.27 dBi. Inverted U-shaped slot is introduced in the feed line for WLAN band(More)
This paper presents an automatic method for segmenting pediatric brain MR images without using atlas priors. The proposed approach comprises of skull stripping, extraction of the cerebrospinal fluid, removal of extraneous portions and final brain segmentation. The method is tested on pediatric images in the age range 1 to 1430 days and the results are(More)
A multi-fractal monopole antenna for Ultra wide band applications is presented in this paper. The proposed antenna consists of a combination of Koch and Sierpinski fractals within a ring. Use of multi-fractal technique leads to improved bandwidth, radiation efficiency and reduced size. The proposed antenna size is 19.5&#x00D7;19.5&#x00D7;1 mm<sup>3</sup>(More)
It is widely known that Control Area Networks (CAN) are used in real-time, distributed and parallel processing which cover manufacture plants, humanoid robots, networking fields, etc., In applications where wireless conditions are encountered it is convenient to continue the exchange of CAN frames within the Wireless CAN (WCAN). The WCAN considered in this(More)
—An ultra wideband (UWB) monopole antenna with dual band-notch characteristic is proposed. Dual arm spiral resonators (DASR) are placed on both sides of the feed line to create band notches at 5.25 and 5.8 GHz for the upper and lower WLAN bands respectively. First the antenna is optimized individually for both upper and lower WLAN band-notch behaviors then(More)