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Wireless Multimedia Sensor Networks (WMSNs) is a novel information acquiring and processing technology which is more competent than traditional sensor networks in transferring and processing of huge amount of multimedia information data, such as audio, video, images and so on. It plays critical role in application in civil, military and commercial fields. In this paper, a Non-control sorting method...
We deduce key design features behind the YouTube video delivery system by building a distributed active measurement infrastructure, and collecting and analyzing a large volume of video playback logs, DNS mappings and latency data. We find that the design of YouTube video delivery system consists of three major components: a “flat” video id space, multiple DNS namespaces reflecting a multi-layered...
Motivated by live streaming applications using peer assistance, we study burst erasure correction codes with optimal decoding delay for parallel-link networks. We consider a new model for network error correction, where each source symbol is decoded at the sink on-the-fly with a strict decoding deadline. We distinguish two types of errors which have very different implications on the code design --...
Effective risk management is essential to the success of real estate projects. However, in fact most of statistics emerging in the process of risk management are either ambiguous or unquantifiable, which makes it very hard to fathom. Fuzzy mathematics, to the contrary, is superior and feasible in the way to enable assessment by means of expressive variables. This article constructs a risk index system...
In this paper, we propose a priority (or progressive) linear coding based opportunistic routing mechanism (OR-PLC) for H.264 video streaming over multi-hop ad hoc networks. OR-PLC assigns different error protection priorities to video packets according to their perceptual importance to mitigate error propagation problem so that the video quality is enhanced in receiver. Furthermore, OR-PLC exploits...
We study different forward error correction (FEC) codes for packet video streaming over erasure channels with strict delay constraints. Our study includes traditional maximum distance separable (MDS) codes and streaming burst erasure codes with optimal delay performance. We develop a continuous-times model to calculate burst error correction capabilities of these codes with a delay constraint. Our...
Ultrahigh spatiotemporal resolved pump-probe signal on a metal nanostructure is detected by femtosecond-SNOM. By using two-color pump-probe configuration, ultrafast hot electron transportation is clearly observed on a time scale of a few hundred femtoseconds.
This paper proposes a distributed haptic control architecture whose coordination gain at each user site is independent of the number of cooperating peers. In the proposed architecture, users interact through manipulating a shared virtual object (SVO) together. The distributed copies of the SVO are controlled through virtual couplers. At each peer, the gain of the force feedback loop is maintained...
Rapid advancement in wireless communication has made it possible to develop vehicular ad hoc networks, in which a vehicle can communicate with other vehicles via a wireless, multi-hop fashion. A variety of appealing real-world applications can be enabled by VANETs, such as driving safety and urban monitoring. Many location based routing algorithms have been proposed for data delivery in VANETs. Most...
This paper investigates through experiments the performance of two recent control architectures for networked haptic cooperation. The two architectures can render direct haptic interaction between networked users in addition to cooperative manipulation of virtual objects. This is because both architectures employ remote dynamic proxies to represent users at their networked peer sites. The remote dynamic...
Emerging IPTV deployments combine Forward Error Correction (FEC) and packet retransmissions to resist the impulse noise of the Digital Subscriber Line (DSL) links. In this work, we re-engineer such a solution to improve its robustness against impulse noise while keeping it backward-compatible with the current network infrastructure. We propose forward and retransmitted Systematic Lossy Error Protection...
This paper introduces a distributed haptic control architecture that can render direct interaction between users in addition to cooperative manipulation of virtual objects. The proposed architecture integrates remote dynamic proxies and peer-to-peer wave-based communications. Remote dynamic proxies are avatars of users at peer sites with motion governed by second order dynamics laws. They render physically-based...
Networked haptic cooperation entails direct interaction among users as well as joint manipulation of virtual objects. To increase the realism of both types of interactions, this paper introduces remote dynamic proxies. Remote dynamic proxies are second order dynamic representations of users at the remote peer sites. They are generated according to dynamics laws and are controlled by the user whom...
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