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Real-time video services are usually delay sensitive and have strict constraints on the transmission reliability, which poses challenges to live video streaming over multi-hop wireless networks, since the unpredictable packet losses and network congestions caused by time-varying wireless channels greatly degrade the received video quality. To address this, in this paper, we propose a reinforcement...
Caching is a technique to reduce the peak network load by pre-fetching some popular contents at the local caches of end users. Coded caching can facilitate and exploit the coded-multicasting opportunities for users with different demands, resulting in an additional and significant reduction of the peak traffic. However, most existing researches on coded caching are limited by the assumption that all...
In this paper, we propose a representation selection optimization problem for complexity constrained adaptive video streaming that properly takes into account the different complexity-rate-distortion (C-R-D) characteristics of the videos when implementing rate control for desired representations. Our objective is to maximize the expected video distortion reduction of users, subject not only to encoding...
In this paper, we extend the traditional rate-distortion optimization (RDO) for the end-to-end wireless video communication system and develop a novel delay-rate-distortion optimization (dRDO) based rate control (RC) algorithm, by investigating the allocation of end-to-end delay to different delay components. Tradeoffs regarding, respectively, source coding delay versus buffering delay and available...
In this paper, we consider the time-varying characteristics of practical wireless networks, and propose a joint dynamic rate allocation and transmission scheduling optimization scheme for scalable video multi-rate multicast based on opportunistic routing (OR) and network coding. With OR, the decision of optimal routes for scalable video coding (SVC) layered streaming is integrated into the joint optimization...
In a video encoding system, the encoding performance would be determined by not only the rate-distortion (R-D) behavior, but also the encoding time and power consumption. To analyze and control the R-D behavior of the video encoding system under the encoding delay and energy constraints, in this paper, we extend the traditional R-D model to a novel delay-power-rate-distortion (d-P-R-D) model by including...
Atmospheric water vapor plays a vital role in studying global climate change. It's very important to accurately determine water vapor amounts (WVA) for predicting rainfalls and weather disasters. Water vapor data are also used as an input parameter in applications of satellite remote sensing. In this paper, we improved an algorithm for water vapor derivation using the Moderate Resolution Imaging Spectroradiometer...
The Moderate Resolution Imaging Spectroradiometer (MODIS) sensor on NASA's Terra satellite provides high quality data for retrieval of aerosol optical depth (AOD). In this paper, a novel approach is proposed to retrieve AOD at 1000m resolution over Zhengzhou city. Then Correlation analysis of AOD derived from MODIS data and Air Pollution Index (API) measured at 3 monitoring sites affiliated to Zhengzhou...
This paper studies a joint coding/routing optimization between network lifetime and rate-distortion, by applying information theory to wireless visual sensor networks for correlated sources. Arbitrary coding (distributed source coding and network coding) from both combinatorial optimization and information theory could make significant progress towards the performance limit of information networks...
In the laser induced interstitial thermotherapy (LITT), real-timely detecting the temperature distribution of the cured tissue is a bottleneck. In this paper, a fully distributed chirped Fiber Bragg grating (FBG) sensor, which is of small size, immune from electromagnetic interference (EMI) and high sensitivity, is proposed to solve this problem. An experiment simulation of LITT is set up, and only...
In this paper a novel Surface-enhanced Raman Scattering (SERS) sensor combining with fused taper optical fiber (FBTF) and the film coating with silver sols is proposed. This structure is designed to obviously increase the SERS active surface when the radius is reduced and the length of the taper is increased, because the penetration depth is proportional to the taper length and inversely proportional...
A novel Surface-enhanced Raman Scattering (SERS) sensor combining with fused taper optical fiber and the film of the silver sols is proposed. We demonstrate the sensing principle and the feasibility of the SERS sensor. Accordingly, the Raman spectrum of R6G is obtained. The detecting concentration is up to 10−7M.
A fully distributed chirped Fiber Bragg grating (FBG) sensor is proposed to detect dynamic change of the temperature distribution of the tissue during laser induced interstitial thermotherapy (LITT). A simulated experiment of LITT is carried out, and the temperature distribution is acquired by the modified simulated annealing evolutionary (MSAE) algorithm.
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