The expressiveness and complexity of several active database prototypes are formally studied. First, a generic framework for the spec-iication of active databases is developed. This factors out the common aspects of the prototypes considered, and allows studying various active database features independently of any speciic prototype. Furthermore, each of the prototypes can be speciied by specia...

We present a model of categorization based on prototypes. A prototype is an image or template of an idealized member of the category. Once a set of prototypes is defined, entities are sorted into categories on the basis of the prototypes they are closest to. We provide a characterization of those categorizations that are generated by prototypes. School of Mathematical Sciences, Tel Aviv Univers...

Molecular communication is an emerging paradigm that exploits the characteristics of information particles for message exchange. It can be served as alternative scenarios where propagation conventional signal carriers, e.g., electromagnetic waves, inapplicable. Current research molecular focuses on theoretical analysis, while it lacks prototype experiments validating theory well advancing pract...