Time synchronization plays a key role in the wireless sensor networks (WSNs). Time synchronization is realized by those messages that are time-stamped. But there are several delay times during transmission after time stamping. Most of them are uncertain and contribute directly to synchronization error. The uncertainties include send time, channel access time, transmission time, and receive time...

In the field of cultural evolution, cognitive agents are either seen as perfect imitators who reproduce cultural variants veridically (e.g. Boyd & Richerson 1985) or as imperfect imitators who transform the variants as they replicate them (e.g. Sperber 1996). In this poster, I explain how the transformative view of cognition applies to not only to the generation of variants, but also to the way...

In this paper, efficient solutions for requantization transcoding in H.264/AVC are presented. By requantizing residual coefficients in the bitstream, different error components can appear in the transcoded video stream. Firstly, a requantization error is present due to successive quantization in encoder and transcoder. In addition to the requantization error, the loss of information caused by c...

a total of 2519 blood samples were collected from five distinct populations of larestan, in fars province, in iran (lar, gerash, khour, latifi and berake) were examined for abo and rh blood groups. the gene frequencies obtained from these samples were compared with the hitherto reported corresponding data from other populations of fars province to determine the genetic structure of the larestan...

The requirement to operate aircrafts in GPS denied environments can be met by use of visual odometry. We study the case that the height of the aircraft above the ground can be measured by an altimeter. Even with a high quality INS that the orientation drift is neglectable, random noise exists in the INS orientation. The noise can lead to the error of position estimate, which accumulates over ti...

1. The polymer and sample preparation 2. Centroid localization 3. Chung-Kennedy (C-K) algorithm 4. Error estimation 5. Image drift 6. Experimental errors and check of the drift compensation 7. Notes on chain conformation recovery 8. Influence of the emission polarization on the localization accuracy 9. Fluorescence brightness of a single molecule 10. Estimation of NA in excitation 11. Movie sho...

Predictive video codecs such as MPEG and H.26x are very susceptible to prediction mismatch between encoder and decoder or “drift” when there are packet losses, leading to a significant reduction in the decoded quality. Targeting backward compatibility with standard predictive video codecs, we propose a method that is conceptually different from conventional error protection schemes and inspired...

Two problems occur when bundle adjustment (BA) is applied on long image sequences : the large calculation time and the drift (or error accumulation). In recent work, the calculation time is reduced by local BAs applied in an incremental scheme. The drift may be reduced by fusion of GPS and Structure-from-Motion. An existing fusion method is BA minimizing a weighted sum of image and GPS errors. ...

For the low bit-rate video communications, video contents have to be transcoded according to network bandwidth and the performance of clients. The heterogeneous low bit-rate transcoding, however, suffers from quality degradation caused by the drift error. In this paper, we propose a novel motion estimation refinement algorithm to compensate drift errors. Simulation results show that the propose...