Longjiang, China
Longjiang, China

Time filter

Source Type

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.

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.

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.

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.

Yang F.,Hechi University
Procedia Engineering | Year: 2011

In the paper, how to meet the users' need plays a very important role in the study on the query-oriented automatic summarization. Combining with the influence of text granularities and query information, we construct a model to explain the relationship between text granularities, point out the way based on the semantic relation to test text similarity, adopt a strategy to sentence dynamically allocation to produce summarization. Experimental results show that there is less redundant but more comprehensive information in the summarization. It confirms that the model and the strategy are effective and feasible for faster query speed and better results. © 2011 Published by Elsevier Ltd.

It is very important how to ensure the network connectivity of the RFID reader in a qualified Campus-Vehicle Early Warning System. In this paper, the intelligent communication terminal is presented and will be used to connect the RFID reader and Campus-Vehicle Early Warning network. The terminal automatically choose one of communication channels such as LAN and WLAN or 3G Network, to make RFID reader connected with the Campus-Vehicle Early Warning network. If a communications link in use failed for some reason, the terminal should automatically choose one from other communication channels to repair a network connection, thus ensuring connectivity of the network. © 2011 Published by Elsevier Ltd.

Li D.,Hechi University
Advanced Materials Research | Year: 2012

Bootstrap method is a statistical method proposed by the American Stanford University professor of Statistics Efron, which belongs to the parameters of statistical methods. According to a given sub-sample, we do not need its distributional assumptions or increase the sample information which can be described the overall distribution characteristics of statistical inference. The basic idea of the Bootstrap statistics is unknown and can not repeat the sampling distribution function instead of using a repeat sampling of the distribution function estimates. The independent identically distributed random variable series X1,...,Xn,have the common probability density function, with 1 μ = EX1.In the paper, combining with multidimensional density function, we discuss the convergence rate with Bootstrap method for the kernel estimation fn (X̄) of the density functional θ = f(μ). © (2012) Trans Tech Publications, Switzerland.

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.

Su A.,Hechi University
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2011

To design new high-performance optical filters and amplifiers, the optical transmission characteristic of one-dimensional photonic crystal ((AB)5C2(BA)5)m was studied based on transfer matrix method. The result shows that as the dielectric constant is the real number, there appear m narrow-band transmission resonance peaks in the transmission spectrum, which can realize the function of adjustable multi-channel optical filtering. When the layer C is the complex dielectric constant containing negative imaginary part (added with active matter), there only appears one super-narrow-band resonance peak at the normalized center frequency of 1.0ω/ω0, and the resonance peak strongly gains with a multiple of up to 104 orders of magnitude. The functions of high-performance optical filters and optical amplifiers are realized. Meanwhile, an extremely strong stimulated radiation appears at the normalized center frequency of 1.0ω/ω0. The transmission gain and the intensities of stimulated radiation closely relate to repetition period m and the size of the negative imaginary part of the complex dielectric constant in layer C. The features all above provide theoretical basis for preparation work of the experiment.

Su A.,Hechi University | Gao Y.-J.,Guangxi University
Wuli Xuebao/Acta Physica Sinica | Year: 2012

The light transfer characteristics of one-dimensional photonic crystal with single and double-barrier quantum well are studied by transfer matrix method. The results show that when the refractive index of the barrier layer is high, the transmission peaks in single-barrier quantum well of photonic crystal will be narrower and the inner localized field will be stronger, that the peak in the double-barrier is narrower than the one in the single-barrier, and also the inner localized field is stronger in the double-barrier, that with the number of period layer in the photonic crystal increasing, the inner localized field in the double-barrier well is enhanced, furthermore, the bigger the refractive index ratio between barrier and dielectric layers of well, the stronger the inner localized field in the photonic crystal quantum well is. In addition, when the periodicity of the barrier layer in the photonic crystal with a thicker refractive index increases, the inner localized field will strengthen faster, and accordingly, the transmittance of the transmission peak will decrease more quickly. Both of the strengthening and decreasing will work at the top speed when all periods in different barriers increase at the same time. While the period number of the photonic crystal in well layers increases, the inner localized fields in both single and double-barrier will increase, but their transmittances of the transmission peak will keep the same. The characteristics above can provide guidance for designing new high-quality quantum optical devices. © 2012 Chinese Physical Society.

Loading Hechi University collaborators
Loading Hechi University collaborators