760 research outputs found
Forecasting bus passenger flows by using a clustering-based support vector regression approach
As a significant component of the intelligent transportation system, forecasting bus passenger
flows plays a key role in resource allocation, network planning, and frequency setting. However, it remains
challenging to recognize high fluctuations, nonlinearity, and periodicity of bus passenger flows due to
varied destinations and departure times. For this reason, a novel forecasting model named as affinity
propagation-based support vector regression (AP-SVR) is proposed based on clustering and nonlinear
simulation. For the addressed approach, a clustering algorithm is first used to generate clustering-based
intervals. A support vector regression (SVR) is then exploited to forecast the passenger flow for each
cluster, with the use of particle swarm optimization (PSO) for obtaining the optimized parameters. Finally,
the prediction results of the SVR are rearranged by chronological order rearrangement. The proposed model
is tested using real bus passenger data from a bus line over four months. Experimental results demonstrate
that the proposed model performs better than other peer models in terms of absolute percentage error and
mean absolute percentage error. It is recommended that the deterministic clustering technique with stable
cluster results (AP) can improve the forecasting performance significantly.info:eu-repo/semantics/publishedVersio
Correction of "Cloud Removal By Fusing Multi-Source and Multi-Temporal Images"
Remote sensing images often suffer from cloud cover. Cloud removal is
required in many applications of remote sensing images. Multitemporal-based
methods are popular and effective to cope with thick clouds. This paper
contributes to a summarization and experimental comparation of the existing
multitemporal-based methods. Furthermore, we propose a spatiotemporal-fusion
with poisson-adjustment method to fuse multi-sensor and multi-temporal images
for cloud removal. The experimental results show that the proposed method has
potential to address the problem of accuracy reduction of cloud removal in
multi-temporal images with significant changes.Comment: This is a correction version of the accepted IGARSS 2017 conference
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Fabrication of a microresonator-fiber assembly maintaining a high-quality factor by CO2 laser welding
We demonstrate fabrication of a microtoroid resonator of a high-quality
(high-Q) factor using femtosecond laser three-dimensional (3D) micromachining.
A fiber taper is reliably assembled to the microtoroid using CO2 laser welding.
Specifically, we achieve a high Q-factor of 2.12*10^6 in the
microresonator-fiber assembly by optimizing the contact position between the
fiber taper and the microtoroid.Comment: 7 pages, 5 figure
Optimal rearrangement problem and normalized obstacle problem in the fractional setting
We consider an optimal rearrangement minimization problem involving the fractional Laplace operator (−∆) s , 0 0} , which happens to be the fractional analogue of the normalized obstacle problem ∆u = χ{u>0}
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