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Video streaming with HDTV or UHDV quality will be provided and widely demanded in the future. However, the transmission bit-rate of high-quality video streaming is quite large, so generated traffic flows will cause link congestion. Therefore, when providing streaming services of rich content, it is important to flatten the link utilization, i.e., reduce the maximum link utilization. To achieve this...
It is known that there exist Triangle Inequality Violations (TIVs) with respect to network Quality of Service (QoS) metrics such as latency between nodes in the Internet. This motivates the exploitation of QoS-aware routing overlays. To find an optimal overlay route, we would usually need to examine all the possible overlay routes. However, this requires both measuring QoS between all node pairs and...
When a link or node failure occurs in a network, flows are detoured and therefore the hop counts of the flows increase. This increase could drastically deteriorate the quality of a network. The flow hop length stability as well as network connectivity is important for network reliability. We investigate a network design method that improves stability and connectivity of a network during a failure...
As a promising solution to manage the huge workload of large-scale VoD services, managed peer-assisted CDN systems, such as P4P has attracted attention. Although the approach works well in theory or in a controlled environment, to our best knowledge, there have been no general studies that address how actual peers can be incentivized in the wild Internet; thus, deployablity of the system with respect...
The transmission bandwidth consumed by delivering rich content, such as movie files, is enormous, so it is urgent for ISPs to design an efficient delivery system minimizing the amount of network resources consumed. To efficiently deliver web content, a content delivery networks (CDNs) have been widely used. CDN providers collocate a huge number of servers within multiple ISPs without being informed...
We propose novel dynamic network control algorithms that reduce the blocking probability for dynamic bandwidth service provisioning. The expected network services include on-demand broad bandwidth provisioning services and layer one VPN. The important service attribute of fairness in terms of path length is effectively achieved by introducing a simple weighting function that considers path length...
We propose a method of identifying anomalous traffic sources using flow statistics. We have investigated a way of detecting whether or not anomalies occur by observing the behavior of several time-series of flow statistics such as the number of flows. After detecting the occurrences of network anomalies, we need to identify the source of the anomalies. In this paper, we describe a method of identifying...
In the Internet, video streaming services in which users can enjoy videos at home are becoming popular. In particular, video streaming with HDTV or UHDV class quality is expected to attract many users in the future. However, the transmission bit rate of HDTV or UHDV is quite large, so traffic flows generated by this service will severely affect other flows. To alleviate the impact caused by this bandwidth-demanded...
In this paper, we propose a Wavelet-based prediction method of the Internet traffic volume. By introducing maximal overlap formulation of the Haar wavelet, the proposed method is free from so-called boundary condition, which arises from processing delay of analysis filters of the wavelet transform and refrains from full utilization of information on recent input signals. The proposed method is based...
As an example to evaluate algorithms and computing environments, and to provide a free Internet service on the ITBL portal, we developed the TIS system, which is an evaluation system of linear iterative solvers and preconditioners for a system of simultaneous linear equations Ax = b. The TIS system can be used to determine an appropriate iterative solver and preconditioner for a matrix A with no programming...
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