Human Computer Interaction

Delay-tolerant networks can complement cellular networks to address today's growth in demand for wireless data. We are interested in delay-tolerant networks for reaching out into underserved regions in growing economies, when distributing media and videos from cities to rural areas.

Measurements of the magnetoquasistatic fields generated from a magnetic dipole (an electrically small current loop) located above the earth are presented and compared with calculations using complex image theory.

Magnetoquasistatic position tracking has been shown to be an excellent technique to measure distances between an emitting and receiving loop for distances up to 50 m along a direction perpendicular to the surface normal of the loops [1].

In this poster we present a wireless position tracking approach using magnetoquasistatic fields and show that it is an excellent technique for locating an active RFID tag.

Two-dimensional (2-D) measurements of the magnetoquasistatic fields generated from a magnetic dipole (an electrically small current loop) located above the earth are compared to calculations using complex image theory.

In this paper we report on a magnetoquasistatic orientation sensor that uses the magnetoquasistatic coupling between an electrically small emitting loop (magnetic dipole) and seven vertical receiving loops located on a circle of radius 12.19 m to determine the orientation of an object.

In this paper, we present measurements using the magnetoquasistatic technique to show that the presence of a large group of 25 people introduces a peak distance error of less than 4.5 cm for an emitter-receiver distance of 10 m.

Measurements of the emitted magnetoquasistatic fields generated by a vertical emitting loop and detected at the terminals of seven fixed vertical receiving loops, all located above earth, are used to solve for position and orientation of the emitter.

We implement CAESAR on commodity hardware and conduct extensive experiments both in controlled network conditions and dynamic radio environments.

In this work we examine a software module that helps network operators to prevent third parties from aggregating wireless base station identifiers by making the identifiers dynamic.