--A new class of interconnection networks is proposed for processor to memory communication in multiprocessing systems. These networks allow a direct link between any processor to any memory module. The cost of these networks is considerably less than that of full crossbars. Moreover, the design and control of these networks is simple. The proposed networks and the full crossbars are analyzed with respect to the bandwidth and the cost.

Depression is one of the most important causes of morbidity and disability in developing countries.1 Zimbabwe, in common with other developing nations, has absolute poverty, economic reform programmes, limited public health services, widespread private and traditional healthcare services, civil unrest, cultural diversity, and sex inequality. We have conducted research on depression in Zimbabwe over the past 15 years, covering ethnographic and epidemiological studies in a range of populations. We compared our findings with research from other developing countries and with evidence from industrialised countries. In the context of developing countries we examined the validity of World Health Organization classifications and medical concepts of depression, the public health implications of depression, and the implications for clinical practice and research.

Background: Surgical mortality data are collected routinely in high-income countries, yet virtually no low-or middle-income countries have outcome surveillance in place. The aim was prospectively to collect worldwide mortality data following emergency abdominal surgery, comparing findings across countries with a low, middle or high Human Development Index (HDI).Methods: This was a prospective, multicentre, cohort study. Self-selected hospitals performing emergency surgery submitted prespecified data for consecutive patients from at least one 2-week interval during July to December 2014. Postoperative mortality was analysed by hierarchical multivariable logistic regression.

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