To the Editor: Delusional parasitosis (DP) (Ekbom syndrome, psychogenic parasitosis, chronic tactile hallucinosis) is a false but unshakable conviction of personal infection by ‘bugs’ of some sort; that is, ectoor endoparasites or other pathogens. This condition may be increasing in frequency, but the subject is virtually absent from the South African medical literature. Failure to diagnose DP ...

This paper examines the effect of partial imaginary precursor cancelling on the performance of a system which uses a DFE and employs a one dimensional modulation. As opposed to QAM, BPSK or GMSK (after proper manipulations) require minimization of the mean square (MS) of the error real part only. Therefore, a lower MSE is achieved if the DFE coefficients are computed taking this fact into accou...

Expressions, as well as necessary and sufficient conditions are given for the existence of the real and pure imaginary solutions to the consistent quaternion matrix equation AXB+CY D = E. Formulas are established for the extreme ranks of real matrices Xi, Yi, i = 1, · · · , 4, in a solution pair X = X1 +X2i+X3j+X4k and Y = Y1+Y2i+Y3j+Y4k to this equation. Moreover, necessary and sufficient cond...