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Message-oriented middleware especially for message queue has been widely used in web applications and services. Performance and scalability are quite essential in these systems however they often become the bottleneck. Existing message queues are not able to scale out elastically very well. This paper presents a decentralized distributed architecture based on peer to peer model, in which we always...
Key-value data store has been widely used in e-commerce systems. The availability issue, which means no data loss and continuous service to users, is quite essential in such systems. This paper presents a lightweight, highly available architecture of key-value data store. This architecture uses a Paxos-based replication protocol to make synchronous replications among replicas. The replication protocol...
Recently, Wireless Mesh Network(WMN) has been used in constructing the city wireless networks. A fair charge scheme is critical for the widely application of the WMN. In this paper, we propose a charge scheme, which not only provides an undeniable bill for users and Wireless Internet Service Providers(WISPs), but also encourages users to forward packets. Furthermore, the least mean square error is...
Pure states are fundamental for the implementation of quantum technologies. Several methods for the purification of the state of a quantum system S have been developed in the past years. Considering two-level systems and assuming a particular interaction between the system S and probe P, we propose a control strategy that purifies an arbitrary mixed state to an eigenstate. An interaction control is...
Duty-cycle prolongs the lifetime of battery-powered wireless sensor networks (WSNs). However, it incurs additional delay because the nodes may be asleep. In addition to energy constraints, many applications have real-time constraints, which means the sink has to be informed before a deadline when an event occurs. Moreover, wireless links among low power radios are highly unreliable. These pose big...
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