2,466 research outputs found
Time-varying Clock Offset Estimation in Two-way Timing Message Exchange in Wireless Sensor Networks Using Factor Graphs
The problem of clock offset estimation in a two-way timing exchange regime is
considered when the likelihood function of the observation time stamps is
exponentially distributed. In order to capture the imperfections in node
oscillators, which render a time-varying nature to the clock offset, a novel
Bayesian approach to the clock offset estimation is proposed using a factor
graph representation of the posterior density. Message passing using the
max-product algorithm yields a closed form expression for the Bayesian
inference problem.Comment: 4 pages, 2 figures, ICASSP 201
Study of the Validity of K. Bane's Formulae for the CLIC Accelerator Structure
The comprehension of short range wakefields is essential for the design of CLIC. Useful tools are the Karl Bane's formulae which provide geometrical parameterization of the short range wake for periodic rotational-symmetric structures. The comparison of 2D computations based on ABCI with predicted results and the study of the range of validity of these formulae are the subjects of this paper. An extended model for rounded iris structures is also proposed
On-line Certification for All: The PINVOX Algorithm
A protoype algorithm: PINVOX ("Personal
Identification Number by Voice") for on-line certification is
introduced to guarantee that scholars have followed, i.e.,
listened and watched, a complete recorded lecture with the
option of earning a certificate or diploma of completion
after remotely attending courses. It is based on the injection
of unique, randomly selected and pre-recorded integer
numbers (or single letters or words) within the audio trace
of a video stream at places where silence is automatically
detected. The certificate of completion or "virtual
attendance" is generated on-the-fly after the successful
identification of the embedded PINVOX code by a video
viewer student
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