30,733 research outputs found
Performance Analysis of Classification Algorithms for Activity Recognition using Micro-Doppler Feature
Classification of different human activities using micro-Doppler data and features is considered in this study, focusing on the distinction between walking and running. 240 recordings from 2 different human subjects were collected in a series of simulations performed in the real motion data from the Carnegie Mellon University Motion Capture Database. The maximum the micro-Doppler frequency shift and the period duration are utilized as two classification criterions. Numerical results are compared against several classification techniques including the Linear Discriminant Analysis (LDA), NaĂŻve Bayes (NB), K-nearest neighbors (KNN), Support Vector Machine(SVM) algorithms. The performance of different classifiers is discussed aiming at identifying the most appropriate features for the walking and running classification
Router deployment of Streetside Parking Sensor Networks in Urban Areas
The deployment of urban infrastructure is very important for urban sensor
applications. In this paper, we studied and introduced the deployment strategy
of wireless on-street parking sensor networks. We defined a multiple-objective
problem with four objectives, and solved them with real street parking map. The
results show two sets of Pareto Front with the minimum energy consumption,
sensing information delay and the amount of deployed routers and gateways. The
result can be considered to provide urban service roadside unit or be taken
into account while designing a deployment algorithm.Comment: UM - Urban Modelling Symposium, Oct 2014, Lyon, France.
\<http://urbanmodelling.sciencesconf.org/\&g
Retrieval of interatomic separations of molecules from laser-induced high-order harmonic spectra
We illustrate an iterative method for retrieving the internuclear separations
of N, O and CO molecules using the high-order harmonics generated
from these molecules by intense infrared laser pulses. We show that accurate
results can be retrieved with a small set of harmonics and with one or few
alignment angles of the molecules. For linear molecules the internuclear
separations can also be retrieved from harmonics generated using isotropically
distributed molecules. By extracting the transition dipole moment from the
high-order harmonic spectra, we further demonstrated that it is preferable to
retrieve the interatomic separation iteratively by fitting the extracted dipole
moment. Our results show that time-resolved chemical imaging of molecules using
infrared laser pulses with femtosecond temporal resolutions is possible.Comment: 14 pages, 9 figure
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