296 Germanakos & Mourlas Copyright 2006, Idea
Adaptation and Personalization of Web-Based Multimedia Content 297 Copyright 2006, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. Perceptual User Requirements: This is the new element/dimension of the user profile. It contains all the visual attention and cognitive processes (cognitive and emotional processing parameters) that completes the user perception and fulfills the user profile. It is considered a vital element of the user profile since it identifies the aspects of the user that is very difficult to be revealed and measured but, however, might determine his/her exact preferences and lead to a more concrete, accurate, and optimized user segmentation. Traditional User Characteristics: This element is directly related to the Perceptual User Requirements element and provides the so-called t r a d i - tional characteristics of a user: knowledge, goals, background, experience, preferences, activities, demographic information (age, gender), socio-economic information (income, class, sector, etc.), and so forth. Both elements are completing the user profiling from the user s point of view. Device/Channel Characteristics: This element is referring to all the characteristics that referred to the device or channel that the user is using and contains information like: bandwidth, displays, text-writing, connectivity, size, power processing, interface and data entry, memory and storage space, latency (high/low), and battery lifetime. These characteristics are mostly referred to mobile users and are considered important for the formulation of a more integrated user profile, since it determines the technical aspects of it. Semantic Multimedia Content: This component is based on metadata describing the content (data) available from the Content Provider (back-end layer). In this way, a common understanding of the data, that is, semantic interoperability and openness is achieved. The data manipulated by the system/architecture is described using metadata that comprises of all needed information to unambiguously describe each piece of data and collections of data. This provides semantic interoperability and a human-friendly description of data. This component is directly related to the New User Profile component, providing together the most optimized personalized Web-based multimedia content result. It is consisted of three elements: Perceptual Provider Characteristics: It identifies the provider characteristics assigned to the Web-based multimedia content or multimedia based service. They are involving all these perceptual elements that the provider has been based upon for the design of the content (i.e., actual content/data of the service, layout preferences, content presentation, etc.) Semantic Content Properties: This element performs the identification and metadata description of Web-based multimedia content or multi-media-based service based on predetermined ontologies. It is implemented in a transparent manner, removing data duplication and the problem of data consistency. Streaming Media Properties: It contains data transition mechanisms and the databases. These databases contain the Web-based multimedia content or
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