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Silicon-on-insulator devices designed for optimum operation at 0.3 V promise longer operational life than conventional application-specific integrated circuits.

We describe a system that locates the position of knocks and taps atop a large sheet of glass. Our INTRODUCTIONGlass is now a very common construction material, often used as clear walls for room dividers or large windows bordering urban buildings. The techniques described in this paper aim at enabling these surfaces to become interactive. For example, information displayed on a projection or monitor on the inside of the glass can be determined by knocking appropriately on the outside. A straightforward application of this niche is an interactive storefront, where passers-by can navigate through information on the store's merchandise or explore special offers by knocking appropriately, even when the store is closed.

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