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and user interface issues.
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Conclusions
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Ubiquitous computing is a compelling vision for the future that is moving closer to
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realization at an accelerating pace. The combination of global wireless and wired
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connectivity along with increasingly small and powerful devices enables a wide array
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of new applications that will change the nature of computing. Beyond new devices
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and communications mechanisms, however, the key technology that is required to
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make ubiquitous computing a reality is data management. Data lies at the heart of all
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ubiquitous computing applications, but these applications and environments impose
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new and challenging requirements for data management technology.
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In this short paper, I have tried to outline the key aspects of ubiquitous computing
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from a data management perspective. These aspects were organized into three
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categories: 1) support for mobility, 2) context-awareness, and 3) support for
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collaboration. I then examined each of these to determine a set of requirements that
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they impose on data management. The over-riding issue that stems from all of these
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is the need for adaptivity. Thus, traditional data management techniques, which tend
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to be static and fairly rigid, must be rethought in light of this emerging computing
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environment.
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I also described two on-going projects that are re-examining key aspects of data
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management techniques: the DataRecharging project, which aims to provide data
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synchronization and dissemination of highly relevant data for mobile users based on
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the processing of sophisticated user profiles; and the Telegraph project, which is
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developing a dynamic dataflow processing engine to efficiently and adaptively
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process streams of data from a host of sources ranging from web sources to networks
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of sensors.
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Of course, there are a number of very important data management issues that have
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not been touched upon in this short paper. First of all, the ability to interoperate
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among multiple applications and types of data will depend on standards for data-
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interchange, resource discovery, and inter-object communication. Great strides are
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being made in these areas, and the research issues are only a small part of the effort
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involved in the standardization process. Another important area, in which on-going
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research plays a central role, is the development of global-scale, secure and archival
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information storage utilities. An example of such a system is the OceanStore utility,
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currently under development at UC Berkeley [KBCC+00].
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