We present results from a data set comprised of five months of RADIUS authentication data taken from a large national dial-up Internet Service Provider (ISP). The data, recorded from May 2000 through September 2000, contains activity from over 600,000 unique user accounts. Over the five months of data collection, the number of sessions per week grew from 13.6 million to 14.4 million. We analyze...

STUDY OBJECTIVE The aim was to examine whether baseline characteristics from a cross sectional survey provided sufficient information regarding non-response bias in a follow up study when compared with information on hospital admissions in the intervening years. DESIGN This was an 11 year follow up study of a cohort selected in 1974 with register information on hospital admissions during foll...

As technology designers, we often inadvertently inscribe values and concepts in systems beyond what we intended. Further, while we aim to work from a userand use-centred perspective, we often miss the perspectives of other critical stakeholders and the broader context in which technology systems are to be used. Reflecting on issues of responsible innovation from the bottom up, this paper explor...

The notion of $f$-derivations of UP-algebras is introduced, some useful examples are discussed, and related properties are investigated. Moreover, we show that the fixed set and the kernel of $f$-derivations are UP-subalgebras of UP-algebras,and also give examples to show that the two sets are not UP-ideals of UP-algebras in general.