231 research outputs found
Two-path succussive relaying with hybrid demodulate and forward
This paper proposes a novel demodulation-and-forward (DMF) scheme for the two-path succussive relay system. While the two-path relaying avoids the data rate loss that occurs in many one-relay cooperative systems, its performance is severely limited by interrelay interference. In this paper, we propose a hybrid DMF scheme for the two-path relay system so that the relays can switch between direct and differential demodulation modes according to channel conditions. The hybrid DMF scheme not only performs better than existing two-path approaches but is easy to achieve synchronization at the relays as well, which is particularly important as a relay receives signals from both the source and the other relay. The proposed hybrid DMF scheme provides an innovative way to implement the two-path relaying scheme
ΠΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π΄ΠΈΠ·Π°ΠΉΠ½ ΠΊΠ°ΠΊ Π²ΠΈΠ·ΡΠ°Π»ΡΠ½ΡΠΉ ΡΠ·ΡΠΊ ΠΌΠ΅ΠΆΠΊΡΠ»ΡΡΡΡΠ½ΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ
This article describes how visual graphics language as a sign system can be in contact with the audience, overcoming the language barrier. In terms of graphic design it can be available to transfer information, and even affect the viewer, causing artistic and emotional reflection.ΠΡΠ° ΡΡΠ°ΡΡΡ ΠΎ ΡΠΎΠΌ, ΠΊΠ°ΠΊ Π²ΠΈΠ·ΡΠ°Π»ΡΠ½ΡΠΉ ΡΠ·ΡΠΊ Π³ΡΠ°ΡΠΈΠΊΠΈ Π² Π²ΠΈΠ΄Π΅ Π·Π½Π°ΠΊΠΎΠ²ΠΎΠΉ ΡΠΈΠΌΠ²ΠΎΠ»ΠΈΠΊΠΈ ΠΌΠΎΠΆΠ΅Ρ Π²Ρ
ΠΎΠ΄ΠΈΡΡ Π² ΠΊΠΎΠ½ΡΠ°ΠΊΡ ΡΠΎ Π·ΡΠΈΡΠ΅Π»Π΅ΠΌ, ΠΏΡΠ΅ΠΎΠ΄ΠΎΠ»Π΅Π²Π°Ρ ΡΠ·ΡΠΊΠΎΠ²ΡΠΉ Π±Π°ΡΡΠ΅Ρ. ΠΠ° ΡΠ·ΡΠΊΠ΅ Π³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π΄ΠΈΠ·Π°ΠΉΠ½Π° ΠΌΠΎΠΆΠ½ΠΎ Π΄ΠΎΡΡΡΠΏΠ½ΠΎ ΠΏΠ΅ΡΠ΅Π΄Π°ΡΡ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΡ ΠΈ Π΄Π°ΠΆΠ΅ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΎΠ²Π°ΡΡ Π½Π° Π·ΡΠΈΡΠ΅Π»Ρ, Π²ΡΠ·ΡΠ²Π°Ρ ΠΏΡΠΈ ΡΡΠΎΠΌ Ρ
ΡΠ΄ΠΎΠΆΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ-ΡΠΌΠΎΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΠ΅ ΠΎΠ±ΡΠ°Π·Ρ
Air quality modeling for effective environmental management in the mining region
<p>Air quality in the mining sector is a serious environmental concern and associated with many health issues. Air quality management in mining regions has been facing many challenges due to lack of understanding of atmospheric factors and physical removal mechanisms. A modeling approach called the mining air dispersion model (MADM) is developed to predict air pollutants concentration in the mining region while considering the deposition effect. The model takes into account the planetβs boundary conditions and assumes that the eddy diffusivity depends on the downwind distance. The developed MADM is applied to a mining site in Canada. The model provides values for the predicted concentrations of PM<sub>10</sub>, PM<sub>2.5</sub>, TSP, NO<sub>2</sub>, and six heavy metals (As, Pb, Hg, Cd, Zn, Cr) at various receptor locations. The model shows that neutral stability conditions are dominant for the study site. The maximum mixing height is achieved (1280Β m) during the evening in summer, and the minimum mixing height (380Β m) is attained during the evening in winter. The dust fall (PM coarse) deposition flux is maximum during February and March with a deposition velocity of 4.67Β cm/sec. The results are evaluated with the monitoring field values, revealing a good agreement for the target air pollutants with <i>R</i>-squared ranging from 0.72 to 0.96 for PM<sub>2.5</sub>, from 0.71 to 0.82 for PM<sub>10</sub>, and from 0.71 to 0.89 for NO<sub>2</sub>. The analyses illustrate that the presented algorithm in this model can be used to assess air quality for the mining site in a systematic way. Comparisons of MADM and CALPUFF modeling values are made for four different pollutants (PM<sub>2.5</sub>, PM<sub>10</sub>, TSP, and NO<sub>2</sub>) under three different atmospheric stability classes (stable, neutral, and unstable). Further, MADM results are statistically tested against CALPUFF for the air pollutants and model performance is found satisfactory.</p> <p><i>Implications</i>: The mathematical model (MADM) is developed by extending the Gaussian equation particularly when examining the settling process of important pollutants for the industrial region. Physical removal effects of air pollutants with field data have been considerred for the MADM development and for an extensive field case study. The model is well validated in the field of an open pit mine to assess the regional air quality. The MADA model helps to facilitate the management of the mining industry in doing estimation of emission rate around mining activities and predicting the resulted concentration of air pollutants together in one integrated approach.</p
Dynamically Coupled 3D Pollutant Dispersion Model for Assessing Produced Water Discharges in the Canadian Offshore Area
Produced water is the contaminated water that is brought
to the
surface in the process of recovering oil and gas. On the basis of
discharge volume, this type of contaminated water is the largest contributor
to the offshore waste stream. Modeling studies of large amounts of
wastewater discharge into offshore areas have helped in the understanding
of pollutant dispersion behaviors in marine environments and in further
evaluating the potential environmental effects resulting from produced
water discharges. This study presents an integrated three-dimensional
(3D) approach for the simulation of produced water discharges in offshore
areas. Specifically, an explicit second-order finite difference method
was used to model the far-field pollutant dispersion behavior, and
this method was coupled with the jet-plume model JETLAG with an extension
of the 3D cross-flow conditions to simulate the near-field mixing
processes. A dynamic coupling technique with full consideration of
the interaction between the discharged fluids and receiving waters
was employed in the model. A case study was conducted on the Grand
Banks of Newfoundland, Canada. The field validation of the modeling
results was conducted for both the near-field and far-field dispersion
processes, and the modeling results were in good agreement with the
field observations. This study provides an integrated system tool
for the simulation of complex transport processes in offshore areas,
and the results from such modeling systems can be further used for
the risk assessment analysis of the surface water environment
The salient region.
<p>The salient region.</p
Buffer-aided max-link relay selection in amplify-and-forward cooperative networks
This paper investigates the outage performance of an amplify-and-forward (AF) relay system that exploits buffer-aided max-link relay selection. Both asymmetric and symmetric source-to-relay and relay-to-destination channel configurations are considered. We derive the closed-form expressions for the outage probability and analyze the average packet delays. We prove that the diversity order is between N and 2N (where N is the relay number) , corresponding to a relay buffer size between 1 and β, respectively. We also analytically show the coding gain. Numerical results are given to verify the theoretical analyses
Meta-analysis of effect of TNF-Ξ± promoter polymorphisms on the risk of HBV persistence.
<p>*-308 A/A and -238 A/A were rare genotypes. Therefore, some studies had to be excluded because they contained no individuals carrying these genotypes. In the study on -308 AA <i>vs</i>. GA +GG, the report by Kummee <i>et al</i><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0019606#pone.0019606-Kummee1" target="_blank">[20]</a> was excluded; in -238 GG <i>vs</i>. AA and -238 AA <i>vs</i>. GA +GG, Cheong <i>et al</i><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0019606#pone.0019606-Cheong1" target="_blank">[10]</a> and Li <i>et al</i><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0019606#pone.0019606-Li1" target="_blank">[17]</a> were excluded.</p><p>Abbreviations: CHB, chronic HBV infection; HC, HBV clearance; OR, odds ratio; CI, confidence interval; df, degree of freedom.</p
Average F-measures obtained from different settings of <i>m</i>.
<p>Average F-measures obtained from different settings of <i>m</i>.</p
Wilcoxon pairwise test result of our method vs. method in reference [19].
<p>Wilcoxon pairwise test result of our method vs. method in reference [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0188118#pone.0188118.ref019" target="_blank">19</a>].</p
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