منابع مشابه
Chronological Sampling for Email Filtering
User models for email filtering should be developed from appropriate training and test sets. A k-fold cross-validation is commonly presented in the literature as a method of mixing old and new messages to produce these data sets. We show that this results in overly optimistic estimates of the email filter’s accuracy in classifying future messages because the test set has a higher probability of...
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The recent sophistications in areas of mobile systems and sensor networks demand more and more processing resources. In order to maintain the system autonomy, energy saving is becoming one of the most difficult industrial challenges, in mobile computing. Most of efforts to achieve this goal are focused on improving the embedded systems design and the battery technology, but very few studies tar...
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The term FFT is used to signify a specific method to compute the DFT in an efficient manner. While a transform in its own right, the DFT/FFT can be interpreted in terms of the CT-Fourier transform for a sampled signal x(t). Let us consider a signal x(t), sampled at the time instants nT, n = 0,1,...N-1, and suppose that the signal is 0 outside the sampled interval [0, (N-1)T]. The Fourier transf...
متن کاملOptimization-based Sampling in Ensemble Kalman Filtering
In the ensemble Kalman filter (EnKF), uncertainty in the state of a dynamical model is represented as samples of the state vector. The samples are propagated forward using the evolution model, and the forecast (prior) mean and covariance matrix are estimated from the ensemble. Data assimilation is carried out by using these estimates in the Kalman filter formulas. The prior is given in the subs...
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We describe several new sampling strategies for Rao-Blackwellized particle filtering SLAM. Two of the strategies, called fixed-lag roughening and the block proposal distribution, attempt to exploit “future” information, when it becomes available, to improve the filter’s estimation for previous time steps. Fixed-lag roughening perturbs trajectory samples over a fixed lag time according to a Mark...
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ژورنال
عنوان ژورنال: Sampling Theory, Signal Processing, and Data Analysis
سال: 2012
ISSN: 2730-5716,2730-5724
DOI: 10.1007/bf03549548