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This paper studies the distributed containment control problem for networked multiple quadrotors with multiple stationary leaders under a directed graph which is the communication topology between the leaders and the followers for arbitrary initial states. Necessary and sufficient conditions on the communication topology are shown. The model of a quadrotor is divided into two subsystems, one is under-actuated...
Video telephony has recently gained its momentum and is widely adopted by end-consumers. But there have been very few studies on the network impacts of video calls and the user Quality-of-Experience (QoE) under different network conditions. In this paper, we study the rate control and video quality of Skype video calls. We first measure the behaviors of Skype video calls on a controlled network testbed...
This paper investigates the consensus problems in directed networks under communication constraints. Each agent has a real-valued state but can only exchange finitely many bits information with its neighbors at each time step. Based on dynamic difference encoding and decoding, a distributed algorithm is proposed to achieve quantized consensus asymptotically with as few as only one bit information...
Based on the analysis of the characteristic of HLA and Web Services, this paper advances a distributed simulation based on web enabling HLA and gives two development methods of the web enabling HLA. This method gives a good solution on building good opening and high model scalability distributed simulation environment and supports the interoperability among heterogeneous simulations and enabling reusability...
In this paper, we investigated the impact of spatial resolution and quantization on the perceptual quality of a compressed video coded from the SVC reference software - JSVM. Two subjective quality tests have been carried out on the TI Zoom2 mobile development platform (MDP). 5 different spatial resolutions (i.e., from QCIF to 4CIF) and 4 different quantization levels (i.e., QP 22, 28, 36, 44) are...
Video multicast over wireless local area networks (WLANs) faces many challenges due to varying channel conditions and limited bandwidth. A promising solution to this problem is the use of packet level forward error correction (FEC) mechanisms. However, the adjustment of the FEC rate is not a trivial issue due to the dynamic wireless environment. This decision becomes more complicated if we consider...
SIP (session initial protocol) is a signaling protocol widely used in IP-based multimedia communication. Recently, P2PSIP reduces the deployment and maintenance cost, as well as improves the robustness and scalability of SIP-based system. SIP, P2PSIP network will coexist in the forthcoming future. This paper focuses on the P2PSIPand its relationship with SIP. We design and implement a P2PSIP adaptor,...
Many asynchronous distributed atomic commit protocols use a coordinator, either an application server or an elected database server, to handle the progress of a transaction. When the coordinator fails or the network becomes partitioned, the transaction may block or may suffer from a split brain syndrome. In this paper we propose a decentralized, collaborative, non-blocking atomic protocol, which piggybacks...
We consider the design of an open P2P live-video streaming system. When designing a live video system that is both open and P2P, the system must include mechanisms that incentivize peers to contribute upload capacity. We advocate an incentive principle for live P2P streaming: a peerpsilas video quality is commensurate with its upload rate. We propose substream trading, a new P2P streaming design which...
Many asynchronous distributed transactional systems use a coordinator, either an application server or an elected database server, to handle the progress of a transaction. When the coordinator fails or the network becomes partitioned, the transaction may block. In this paper we propose a ring-based transactional architecture for distributed database systems. The transaction can progress even if the...
In this paper, we consider applying multiple description coding in mesh-pull P2P live streaming networks to provide incentives for redistribution. In our system, a video is encoded into multiple descriptions with each description having equal importance. We consider a heterogeneous system with peers having different uplink bandwidths. We design a distributed protocol in which a peer contributing more...
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