Entity

Time filter

Source Type

Longjiang, China

Feng Y.,Hechi University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

Abnormal value that in the predictive model of Ad Hoc networks may affecting the whole system’s working efficiency. We proposed a new detect method to dealing with this problem, constructed a forwarding model firstly, and then constructed a suitable model function through smoothing and modeling the time series. By using the mean shift model, we calculated the time series posterior probabilities and abnormal perturbation values, and then adjusted them, so as to weakening the influence of time series abnormal value. To verifying the efficiency of this forwarding method, we selected a time series with 300 observation points as the numerical example, statistics and analysis results indicate that it will be helpful to improve the efficiency of prediction models if we using this method. © Springer International Publishing Switzerland 2016. Source


Wen F.,Guangxi Institute of Botany | Qin G.-L.,Hechi University | Wei Y.-G.,Guangxi Institute of Botany | Liang G.-Y.,Guangxi Institute of Botany | Gao B.,Guangxi University of Technology
Phytotaxa | Year: 2012

Primulina hochiensis var. rosulata, a new endemic variety from Guangxi, China, is described and illustrated. It is similar to P. hochiensis sensu stricto, but differs in lacking stolons, the different indumentum of peduncle, corolla, filament and anthers, leaf blades elliptical to slightly ovate, calyx purple, corolla white or pink, filaments geniculate close to the base, staminodes 3, and stigmas translucent to white, obtrapeziform, 2-lobed. © 2012 Magnolia Press. Source


Su A.,Hechi University
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

To design new-style effectively optical devices such as filters, amplifiers, attenuators and switches, the transmission characteristics of one-dimension photonic crystal(AB)m(AABAABAABAA)n(BA)m were studied by the transfer matrix method theory. The results show that with the real or complex dielectric constant, (AB)m(AABAABAABAA)n(BA)m will be formed into quantum-well structure photonic crystal which presents an apparent quantized effect. The number and frequency location of the transmission peaks of the thus-formed photonic crystal are closely related to the value of n. When nB is a complex dielectric constant with a negative imaginary part, the transmission peaks in the well present transmission gains and amplification at various levels. The transmission gains even reach as high as 103, and at some transmission peaks, strong stimulated radiation up to 104 orders of magnitude are found. When n≥3, both the multiple of the transmission gain and the maximum of stimulated radiation decrease with increasing n. And when nB is of a complex dielectric constant, peaks obviously show attenuated in the transmission. These characteristics offer theoretical guidance for preparation photonic crystals. Source


Su A.,Hechi University
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

To design high-quality optical devices, such as filters and switches, the effect of lattice constant on the transmission spectra of one-dimensional optical crystal quantum well(AB)5(CD)2(BA)5 was studied with transfer matrix method. The result shows that when the lattice constants of layer A and layer B separately increase with even times, the narrow transmission peaks at center frequency of band gap turns into wide transmission band, both sides of which are symmetrically distributed with two narrow transmission peaks of 100% transmittance; when lattice constants of layer A increases with odd times, a single transmission peak of 100% transmittance appears at the center frequency; when the lattice constants of layer B increases with odd times or that of layer D increases with integral multiple, three transmission peaks of 100% transmittance constantly turn up at the center frequency of band gap, and the three ones draw closer to the center of band gap as lattice constants of layer B and D are increasing; when lattice constant of layer D increases with integral multiple, three transmission peaks of 100% transmittance constantly present at the center frequency of band gap, besides, double-transmission-peak structure, which is closely related to the lattice constants, symmetrically appears on its two sides. Meanwhile, the transmittances of each double-transmission-peak enlarge with the integral multiple of lattice constants increasing. All these features can be applied to adjustable-channel optical filtering and switching, and can offer theoretical direction for experiment preparation. Source


The transmission spectra of one-dimensional photonic crystal (ABD)m (CBA)n (ABD)m (CBA)n is studied by transfer matrix method. The result shows that when the number of period m or the thickness dD of layer D is increased, the two resonant tunneling modes in the transmission spectra become narrower, but their frequencies remain unchanged; with the increase of the number of period n or the thickness dC of layer C, the two resonant tunneling modes get close to the middle and tend to degenerate; then the structure and the location of the di-resonant tunneling modes stay the same along with the increase of the thickness dA of layer A; while as the thickness dB of layer B is increased, the structure of the tri-resonant tunneling modes shift to low frequency then gradually disappear; and with the increase of the incident angle θ, the two resonant tunneling modes get close to the middle of the band gap. These transmission spectra characteristics can make the single-channel and double-channel filters both adjustable and quality. Source

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