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research sensors machine learning filtering recommender systems recsys collaborative london ucl smartphones data mining monzo data skyscanner data-science smartphone mobile recommender systems collaboration android recommender system emotionsense personalization public transport oyster card minneapolis #ubicomp13 healthcare customer service fintech telefonica graphs trust birkbeck networks transport tube intelligent transport systems diversity pervasive phd collaborative filtering sybils vehicular attacks experts ijcai nlp tfl product python big data #research #mobile #mhealth #datascience #qs #quantifiedself #emotionsense mhealth health #mbiq14 apps open source science and technology quantified self mobile phone shared bicycles recsys2012 #mscss #mobisys2012 #per2012 data science location-based service geographic information system ubicomp2011 smart cities mobility privacy