Population surveys of health and fertility are an important source of information about demographic trends and their likely impact on the HIV/AIDS epidemic. In contrast to groups sampled at health facilities they can provide nationally and regionally representative estimates of a range of variables. Data on HIV-sero-status were collected in the 2001 Zambia Demographic and Health Survey (ZDHS) a...

An algorithm for decomposition of highly multicomponent signals, with variable components energy, has been proposed. The algorithm combines the singular value decomposition with the suitable time-frequency analysis approach. The auto-correlation matrix is obtained by applying the inverse form of the cross-terms free time-frequency distribution. The decomposition of the time-frequency based auto...

This paper presents a new family of synchronisation sequences, Concatenated Extended Complementary (CEC) sequences. CEC-sequences have recently been adopted for Release 4 of UMTS TDD mode as inter-base station synchronisation codes. They provide perfect auto-correlation properties within a windo of adjustable size, excellent overall auto-correlation properties and allow the use of low-complexit...

In time-frequency analysis there are four bilinear domains commonly used: time-frequency, ambiguity, temporal auto-correlation, and spectral auto-correlation. This paper introduces four new domains that are quadralinear in the signal. These four domains are each a function of three of the four variables used in the bilinear domains. Properties of these quantities are developed and an applicatio...

SUMMARY Spreading sequences with appropriate negative auto-correlation can reduce average multiple access interference (MAI) in asyn-chronous DS/CDMA systems compared with the conventional Gold Sequences generated by linear feedback shift registers (LFSRs). We design spreading sequences with negative auto-correlation based on Gold sequences and the chaos theory for the Bernoulli map. By compute...

We use high-resolution hydrodynamical simulations to investigate the spatial correlation between weak (NHI < 10 cm) Lyα absorbers and gas–rich galaxies in the local universe. We confirm that Lyα absorbers are preferentially expected near gas–rich galaxies and that the degree of correlation increases with the column density of the absorber. The real–space galaxy auto–correlation is stronger than...

This paper presents a moving vehicle detection and tracking system, which comprising of Horizontal Edges method and Local Auto Correlation. Horizontal Edges characteristic can be strengthened and the influence of weather condition is reduced by using Local Auto Correlation, so the detection rate of extracting and tracking moving vehicles with horizontal edge can be raised. Local Auto Correlatio...

Motivated by complex phenomena embedded into time series, this paper proposes EHLAC (Exponential-Weighted Higher-Order Local Auto-Correlation), an approach to extract features from dynamic data based on polynomial relations over time. The main idea for this new approach is to preprocess data in order to improve modeling performance of different techniques. EHLAC extends the traditional HLAC (Hi...