scholarly journals Measurements, modeling and simulations of the UWB propagation channel based on direct-sequence channel sounding

2005 ◽  
Vol 5 (5) ◽  
pp. 513-523 ◽  
Author(s):  
Dajana Cassioli ◽  
Annalisa Durantini
Keyword(s):  
Direct Sequence ◽  
Modeling And Simulations ◽  
Propagation Channel ◽  
Channel Sounding

Hybrid single frequency network propagation channel sounding and antenna diversity measurements

2010 ◽  
Vol 29 (1) ◽  
pp. 7-21 ◽  
Author(s):  
Frédéric Lacoste ◽  
Gaël Scot ◽  
Benjamin Ros ◽  
Patrice Pajusco ◽  
Jean Marc Conrat ◽  
...  
Keyword(s):  
Single Frequency ◽  
Antenna Diversity ◽  
Propagation Channel ◽  
Channel Sounding ◽  
Single Frequency Network ◽  
Network Propagation

Memory Processes, Aging, Cognitive Decline, and Neurodegenerative Diseases

2006 ◽  
Vol 11 (4) ◽  
pp. 304-311 ◽  
Author(s):  
Lars-Göran Nilsson
Keyword(s):  
Cognitive Impairment ◽  
Cognitive Decline ◽  
Neurodegenerative Disease ◽  
Genetic Markers ◽  
Brain Activity ◽  
Memory Performance ◽  
Modeling And Simulations ◽  
Aging And Health ◽  
Explained Variance ◽  
Different Levels

This paper presents four domains of markers that have been found to predict later cognitive impairment and neurodegenerative disease. These four domains are (1) data patterns of memory performance, (2) cardiovascular factors, (3) genetic markers, and (4) brain activity. The critical features of each domain are illustrated with data from the longitudinal Betula Study on memory, aging, and health ( Nilsson et al., 1997 ; Nilsson et al., 2004 ). Up to now, early signs regarding these domains have been examined one by one and it has been found that they are associated with later cognitive impairment and neurodegenerative disease. However, it was also found that each marker accounts for only a very small part of the total variance, implying that single markers should not be used as predictors for cognitive decline or neurodegenerative disease. It is discussed whether modeling and simulations should be used as tools to combine markers at different levels to increase the amount of explained variance.

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