The rising tide of dementia worldwide

Group Health Center for Health Studies, Seattle, WA 98101, USA.
The Lancet (Impact Factor: 45.22). 09/2008; 372(9637):430-2. DOI: 10.1016/S0140-6736(08)61003-X
Source: PubMed
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Available from: Kenneth Langa,
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    • "The dementing disorders represent a major burden for societies and the magnitude of this burden is likely to increase with the rising tide of dementia worldwide (Larson and Langa, 2008) Vascular factors like hypertension, ischemic heart disease, diabetes mellitus and obesity are associated with increased risk of dementia and can be targeted for preventive strategies (Skoog et al., 1999). Anthropometric measurements have featured prominently in many studies for the diagnosis of obesity. "
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    ABSTRACT: In this paper, we introduce a Roundrobin Arbiter Generator (RAG) tool. The RAG tool can generate a design for a Bus Arbiter (BA). The BA is able to handle the exact number of bus masters for both on-chip and off-chip buses specified by the user of RAG. RAG can also generate a distributed and parallel hierarchical Switch Arbiter (SA). The first contribution of this paper is the automated generation of a round-robin token passing BA to reduce time spent on arbiter design. The generated arbiter is fair, fast, and has a low and predictable worst-case wait time. The second contribution of this paper is the design and integration of a distributed fast arbiter, e.g., for a terabit switch, based on 4x4 and 2x2 switch arbiters (SAs). Using a .25 TSMC standard cell library from LEDA Systems [11, 15], we show the arbitration time of a 256x256 SA for a terabit switch and demonstrate that the SA generated by RAG meets the time constraint to achieve approximately six terabits of throughput in a typical network switch design. Furthermore, our generated SA performs better than the Ping-Pong Arbiter and Programmable Priority Encoder by a factor of 1.9X and 2.4X, respectively.
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    ABSTRACT: The aim of this paper is to investigate the effect of atmospheric ducts on modern OFDM-based broadcasting systems in VHF, UHF and L bands. Full-wave parabolic equation method will be used for calculation of electromagnetic field strength in time domain. It will be shown that the effect of atmospheric duct on the delay of electromagnetic field is negligible in comparison with the guard interval of OFDM signal. However, the duct amplifies the strength of EM signal which causes interference effects on adjacent services and because of brick-wall properties of OFDM-based signals; it may cause harmful effects on adjacent services and reduce the frequency reuse distance. Finally, it will be shown that the duct affects the field at far distances. Consequently, the usages of low distributed power transmitters are recommended for radio coverage in the presence of ducts.
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