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Cognitive radar is a recently proposed approach in which a radar system may adaptively and intelligently interrogate a propagation channel using all available knowledge including previous measurements, task priorities, and external databases. A distinguishing characteristic of cognitive radar is that it operates in a closed loop, which enables constant(More)
In an ancient keyword-search system over XML information, a user composes a keyword question, submits it to the system, and retrieves relevant answers. Within the case wherever the user has restricted data regarding the info, usually the user feels “left within the dark” once issue queries, and must use a try-and-see approach for locating data. During this(More)
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