Managing contextual preferences

Abstract

a b s t r a c tTo handle the overwhelming amount of information currently available, personalization systems allow users to specify through preferences which pieces of data interest them. Most often, users have different preferences depending on context. In this paper, we introduce a model for expressing such contextual preferences. Context is modeled using a set of hierarchical attributes, thus allowing context specification at various levels of detail. We formulate the context resolution problem as the problem of selecting appropriate preferences based on context for personalizing a query. We also propose algorithms for context resolution based on data structures that index preferences by exploiting the hierarchical nature of the context attributes. Finally, we evaluate our approach from two perspectives: usability and performance. Usability evaluates the overheads imposed on users for specifying context-dependent preferences, as well as their satisfaction from the quality of the results. Our performance results focus on the context resolution using the proposed indexes.

A Framework for Time-Aware Recommendations

“…Time is modeled here as a multidimensional attribute. The dimensions of time have a hierarchical structure, that is, time values are organized at different levels of granularity (similar to [16,18]). In particular, we consider three different levels over time: time of day, day of week and time of week with domain values {"morning", "afternoon", "evening", "night"}, {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"} and {"Weekday", "Weekend"}, respectively.…”

“…The selection of the appropriate preferences can be made more efficient by deploying indexes on the context of the preferences. Such a data structure that exploits the hierarchical nature of context, termed profile tree, is introduced in [18].…”

A Fuzzy-Rule-Based Model for Handling Contextual Preference Queries

“…Our initial work 18 was somewhat inspired by the approach proposed by Stefanidis et al 9,10,19 . Hereafter, we review this approach in a more detailed way and highlight some of its basic shortcomings.…”

“…Contextual preferences (i.e., preferences that depend on context) have recently attracted considerable attention in many research fields 2,3,4,5,6,7,8,9 . In the database field, one of the most interesting works about contextual preferences is that by Stefanidis et al 9,10,11 .…”

“…In the database field, one of the most interesting works about contextual preferences is that by Stefanidis et al 9,10,11 . In this work, the context is represented as a set of multidimensional parameters.…”