Kenji Kurata

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According to the past researches, a TCP Ve-gas version is able to achieve higher throughput than TCP Tahoe and Reno versions, which are widely used in the current Internet. However, we need to consider a migration path for TCP Vegas to be deployed in the Internet. By fo-cusing on the situation where TCP Reno and Vegas connections share the bottleneck link,(More)
TCP Vegas version is expected to achieve higher throughput than TCP Tahoe and Reno versions, which are currently used in the Internet. However, we need to consider a migration path of TCP Vegas when it is deployed in the Internet. In this paper, we focus on the situation where multiple TCP Reno and Vegas connections coexist at the bottleneck router, by(More)
In this paper, we first investigate the fairness between TCP Reno and TCP Vegas by focus-ing on the situation where Reno and Vegas connections share the bottleneck link. From the analysis and the simulation results, we find that the performance of TCP Vegas is much smaller than that of TCP Reno as opposed to an expectation on TCP Vegas. The RED algorithm(More)
After a natural disaster and during the post-disaster reconstruction time, on-line newspapers, social networks and blogs become very active describing many events interrelated. This work proposes several unsupervised models to extract main features and patterns from high dimensional text data generated during natural disasters. The main idea is to provide(More)
In recent years, the number of the Internet population is exploding and various kinds of applications are injected into the Internet. A rapid increase of the network traffic brings many problems, since the traditional Internet was not assumed to accommodate such applications. Unfairness among TCP connections is one of most important problems in the current(More)
TCP Vegas version is expected to achieve higher throughput than TCP Tahoe and Reno versions, which are currently used in the Internet. However, we have revealed that when the traditional TCP Reno connections and TCP Vegas connections co-exist in the network, the throughput of TCP Vegas connections degrades significantly. In this paper, we propose ZL-RED(More)
In this paper, we propose ZL-RED (Zombie Listed RED) algorithm, which ehhances SRED algorithm to provide better fairness among many flows at the router buffer. ZL-RED uses the Zombie List, which is also used by SRED, to detect misbehaving flows which send packets to the router at higher rate than the other flows, and sets larger packet discarding(More)
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