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In most existing cloud services, a centralized controller is used for resource management and coordination. However, such infrastructure is gradually not sufficient to meet the rapid growth of mega data centers. In recent literature, a new approach named devolved controller was proposed for scalability concern. This approach splits the whole network into several regions, each with one controller to...
The capacity of data management and the query performance are two main metrics for today's cloud storage system. In this paper, we design a two-layer indexing scheme of distributed secondary index on switch-centric data center network (DCN) topologies. We take advantage of the desirable features of switch-centric topologies, such as stability, scalability, and fault tolerance, and successfully improve...
In wireless sensor networks, barrier coverage is a fundamental category of coverage problems and its surveillance capability can be reinforced when utilizing camera sensors. In this paper, we propose a distributed algorithm to solve the problem of Full-View Barrier Coverage with rotatable camera sensors (FBR). Our goal is to minimize the active sensor number when guaranteeing the surveillance capabilities...
In the big data era, the principal traffic bottleneck in a data center is the communication between hosts. Moreover, the redundant packet contents indeed take a major part of the bottleneck. In this paper, we propose a distributed and efficient cache sharing protocol, named DCP, to eliminate redundant traffic in data center with Fat-Tree topology. In DCP, each switch holds packet caches, which are...
To overcome the inherent lossy property of wireless links and increase network throughput, many multi-path routing protocols have been proposed to improve the reliability and latency of packet delivery in wireless networks. Multi-path routing protocols, however, do not take advantage of existing coding opportunities to maximize network throughput. In this paper, we propose a novel coding-aware multi-path...
In this paper we consider gossip-based peer-to-peer streaming applications where multiple sources exist and they work serially. More specifically, we tackle the problem of fast source switching to minimize the startup delay of the new source. We model the source switch process and formulate it into an optimization problem. Then we propose a practical greedy algorithm that can approximate the optimal...
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