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Cloud download service, as a new application which downloads the requested content offline and reserves it in cloud storage until users retrieve it, has recently become a trend attracting millions of users in China. In the face of the dilemma between the growth of download requests and the limitation of storage resource, the cloud servers have to design an efficient resource allocation scheme to enhance...
Due to the inefficient resource adjustment, the current P2P file sharing systems cannot achieve the balanced relationship between supply and demand over the resources. Especially after a popular content releasing, a burst of downloaders often can't find sufficient uploaders and their request may starve the upload capacity of server. Therefore the overall system QoS may be degraded. To tackle such...
With the increasing popularity of cloud computing, there is an increased demand for cloud resources in cloud. It has become even more urgent to find solutions to improve resource utilization. From the perspective of a cloud consumer, a cloud application processes a large information flow involving user actions that access resources, but little work has so far been devoted to research from the perspective...
A novel Internet content distribution service Offline downloading service has emerged recently and attracted a large number of users all over the world. Unlike traditional Internet content distribution systems such as Bittorrent (BT), Offline downloading service uses dedicated cloud unities (Cache cloud) to store files what users wish to download and provide uploading, in order to guarantee file availability...
As the multipath propagation delay in troposcatter is the key factor to work upon the communication quality, It is of the utmost importance to build the multipath delay power spectrum model and estimate the multipath delay spread for design and performance analysis of system. Complicated in scatter channel, no universal way to estimate the multipath delay has been found especially in short-range scatter...
The frequency selective fading in the troposcatter channel deforms the signal spectrum and may give rise to intersymbol interference, but if taking some measures, the effect of the diversity would be available by using the characteristic, that is implicit diversity. As yet, the performance of the implicit diversity has not been analytically measurable. In this paper, a model is built, and through...
As the spread of broadband Internet access, the online Internet video becomes popular in our daily life. The search engine is an important tool for users to access online video, resulting in considerable traffic on the video Websites. In this work, we statistically analyze the video access log provided by a large scale video search engine, and validate that the aggregated views of online video from...
Despite of the high connectivity of the Internet, border gateway protocol (BGP) often loses connectivity in the case of no alternate routes to destination. To ensure that Internet domains stay connected, this paper employs virtual ring routing scheme to provide a backup routing path for BGP. We evaluate the performance of virtual ring routing scheme by simulations on a BGP-connected topology with...
Sensor localization is a fundamental and crucial issue for wireless sensor networks operation and management. In this paper, we present a new localization scheme with mobile beacon for wireless sensor networks. The scheme relies on TDoA (time difference of arrival) of the mobile beacon RF signals measured locally at a sensor to detect range differences from the sensor to the different position of...
Incremental and decremental algorithms can reduce complexity greatly in antenna selection and maximize the capacity of MIMO systems. However, the computation complexity is still large in systems with large scale antenna array. Improved algorithms using the two methods simultaneously are proposed, which can further reduce the computation with a little loss in capacity
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