Papers by Mohammed Shadeed
International Agrophysics, 2000
... PICHE EVAPORIMETERS. II. ACCURACIES OBTAINED IN SOME AFRICAN CASE STUDIES CJ Stigter 1 , RMR ... more ... PICHE EVAPORIMETERS. II. ACCURACIES OBTAINED IN SOME AFRICAN CASE STUDIES CJ Stigter 1 , RMR Kainkwa 2 , SBB Oteng'i 3 , LOZ Onyewotu 4 , AEMohammed 5 , AA Ibrahim 6 , MGM Rashidi 2 TTMI-Project ...
In this paper, we present a novel algorithm for adaptive fuzzy segmentation of MRI data and estim... more In this paper, we present a novel algorithm for adaptive fuzzy segmentation of MRI data and estimation of intensity inhomogeneities using fuzzy logic. MRI intensity inhomogeneities can be attributed to imperfections in the RF coils or some problems associated with the acquisition sequences. The result is a slowly-varying shading artifact over the image that can produce errors with conventional intensity-based classification. Our algorithm is formulated by modifying the objective function of the standard fuzzy c-means (FCM) algorithm to compensate for such inhomogeneities and to allow the labeling of a pixel (voxel) to be influenced by the labels in its immediate neighborhood. The neighborhood effect acts as a regularizer and biases the solution towards piecewise-homogeneous labeling. Such a regularization is useful in segmenting scans corrupted by salt and pepper noise. Experimental results on both synthetic images and MR data are given to demonstrate the effectiveness and efficiency of the proposed algorithm.
Long Term Evolution (LTE) is the next step forward in cellular 3G services. Expected in the 2008 ... more Long Term Evolution (LTE) is the next step forward in cellular 3G services. Expected in the 2008 time frame, LTE is a 3GPP standard that provides for an uplink speed of up to 50 megabits per second (Mbps) and a downlink speed of up to 100 Mbps. LTE will bring many technical benefits to cellular networks. Bandwidth will be scalable from 1.25 MHz to 20 MHz. This will suit the needs of different network operators that have different bandwidth allocations, and also allow operators to provide different services based on spectrum. LTE is also expected to improve spectral efficiency in 3G networks, allowing carriers to provide more data and voice services over a given bandwidth. This technical white paper provides an overview of the LTE physical layer (PHY), including technologies that are new to cellular such as Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) data transmission.
Uploads
Papers by Mohammed Shadeed