Herbert Chan

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OBJECTIVES Determine the prevalence of drug use in injured drivers and identify associated demographic factors and crash characteristics. DESIGN Prospective cross-sectional study. SETTING Seven trauma centres in British Columbia, Canada (2010-2012). PARTICIPANTS Automobile drivers who had blood obtained within 6 h of a crash. MAIN OUTCOME MEASURES(More)
BACKGROUND British Columbia, Canada is a geographically large jurisdiction with varied environmental and socio-cultural contexts. This cross-sectional study examined variation in motor vehicle crash rates across 100 police patrols to investigate the association of crashes with key explanatory factors. METHODS Eleven crash outcomes (total crashes, injury(More)
The February 2013 issue of the IJE included our study which used culpability analysis to examine the association of cellphone use with motor vehicle crashes. 1 In a commentary in the same issue, Sanghavi stated that 'culpability analysis won't help us understand crash risk due to cellphones'. 2 Sanghavi's categorical rejection of culpability analysis is(More)
The conventional channel-optimized vector quantization (COVQ) is very powerful in the protection of vector quantization (VQ) data over noisy channels. However, it suffers from the time consuming training process. A soft decoding self-organizing map (SOM) approach for VQ over noisy channels is presented. Compared with the COVQ approach, it does not require a(More)
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