3Wilson T D.Human information behavior. Journal of Information Science . 2000
4HAASE A,STEPTOE A, SALLIS J F, et al. Leisure time physical activity in university students from 23 coun- tries: Associations with health beliefs, risk awareness, and national economic development[J]. Preventive Medi- cine,2004,39(1) 182 190.
5DRAIJER G, KALFS N, PERDOK J. GPS as data collection method for travel research[J]. Journal of Transpor- tation Research Board. 2001,1719 = 147-153.
6GLEAVE S, GEOSTATS. The use of GPS to improve travel data[R]. London:the London Department for Trans- port, 2003.
7AMPT E, STOPHER P, WUNDKE J. Households on the move-experience of a new approach to voluntary travel behaviour change[R]. Sydney:the 28th Australasian Transport Research Forum,2005.
8WU J, JIANG C, LIU Z, et al. Performances of different global positioning system devices for time-location track- ing in air pollution epidemiological studies[J]. Environmental Health Insights, 2010(4) 93-108.
9OHMORI N, NAKAZATO M, SASAKI K, et al. Activity diary surveys using GPS mobile phones and PDA[R]. Washington D C:Transportation Research Board 85th Annual Meeting,2006.