In ubiquitous computing environment, smart objects get environmental data from sensors, and combine various sensor data. After processing these data, smart object can provide intelligent service to user. To do this, smart object should be compatible with sensors and service provider. In this paper, we propose a middleware for smart object in ubiquitous computing. A middleware uses metadata for interoperability between sensor and middleware and between service and middleware. This middleware could be used in u-healthcare, smart home, etc.
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