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This SpringerBrief presents key enabling technologies and
state-of-the-art research on delivering efficient content
distribution services to fast moving vehicles. It describes recent
research developments and proposals towards the efficient,
resilient and scalable content distribution to vehicles through
both infrastructure-based and infrastructure-less vehicular
networks. The authors focus on the rich multimedia services
provided by vehicular environment content distribution including
vehicular communications and media playback, giving passengers many
infotainment applications. Common problems of vehicular network
research are addressed, including network design and optimization,
standardization, and the adaptive playout from a user's
perspective.
The development of ontologies which aims at capturing knowledge as
a formal structural framework, is an important foundation for a
wide range of applications. Since ontology development is usually a
collaborative activity which may span a long period of time, it is
critical to provide developers with a suitable development
environment that supports collaboration in a flexible manner and
that facilitates the building of robust and accurate ontologies. In
this dissertation, the author focusses his effort on providing an
easy-to-use collaborative ontology development environment that
supports both synchronous and asynchronous collaborative
activities. Two prototype systems were developed to reach the goal
based on an extensive requirement study. The first prototype system
servers numerous functions in supporting synchronized cooperation.
A Java based application provides developers with several
functions. For example, with the help of group-awareness and a
locking mechanism, involved developers become aware of actions from
other users, which enables them to work without conflict in terms
of editing the same ontology resources. Based on the experiences
gathered from implementing the first prototype system, the
requirement of supporting asynchronous cooperation was studied. A
version control system especially in the fields of coping with
ontology data structure is a central component to satisfy the
requirement. This second approach primarily supports local
workspaces that can be synchronized with a central server-based
ontology store and is capable of controlling versions on the level
of individual ontology resources. Although working in their own
workspace ontology developers can achieve a consensual shared
ontology through committing, updating and merging activities. Each
version of an ontology resource will be preserved in the form of a
snapshot. The evolution of either a single ontology resource or the
entire ontology can further be illustrated to developers in a
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