| Summary: | 博士 === 國立高雄第一科技大學 === 工程科技研究所 === 94 === Abstract
With the convenience, visiting website via mobile device is an increasing demand.
Due to the capabilities discrepancy between mobile device and desktop, content
presentation problem arose when existed content can not fit into the screen of mobile
device. This content presentation problem may impact on people’s reading and
comprehending ability. Content adaptation has shown significant benefits by enhancing
Web accessibility to meet users’ requirements in heterogeneous environments. However,
existing content adaptation servers do not supply mobile users with this facility due to
the discrepancies of screen and user context. To provide mobile users with a friendly
and comprehensible way in reading HTML contents, we present a new middleware
called Context-oriented Content Adaptation Framework (CCAF).
In CCAF, rule-based adaptation strategy is used to customize content presentation.
The adaptation strategies used in adaptation process are generated according to client’s
features. We refer clients’ features (or contexts in short) to the information that may
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affect their perceptions of browsing Web contents, such as clients’ preferences and
sensations, situated places, as well as devices and network connectivity. An adaptation
strategy is composed of selected adaptation rules based on client’s context. We used
Java Expert System Shell (JESS) to implement adaptation strategies for guiding the
transformation process. When a user’s context changed, new adaptation strategy will be
generated automatically by rearranging adaptation rules. For mobile screen display,
content is decomposed into object level. Original objects and transcoded objects are
stored in middleware and managed by a three-layered Content Structure Model, which
facilitates resource participation. Moreover, a dynamic template composition method is
also proposed to prevent from the necessary of complicated stylesheet management.
The experiment results indicate our Context-oriented Content Adaptation
Framework can successfully adapt Web contents into other versions satisfying mobile
users’ contexts and obtain superior performance.
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