In multihop wireless networks, hop-by-hop reliability is generally achieved through positive acknowledgments at the MAC layer. However, positive acknowledgments introduce significant energy inefficiencies on battery-constrained devices. This inefficiency becomes particularly significant on high error rate channels. We propose to reduce the energy consumption during retransmissions using a novel...

Manipulating probability distributions is central to data compression, so it is natural to ask how well we can compress probability distributions themselves. For example, this is useful for probabilistic reasoning [2] and query optimization [6]. Our interest in it stems from designing single-round asymmetric communication protocols [1,4]. Suppose a server with high bandwidth wants to help a cli...

Access to different and remote sources with heterogeneous formats is one of the most important challenges in Enterprise Information Integration. Even though there exists an increasing number of solutions which obtain information from structured and semistructured sources such as web sites, lack of Quality of Service in HTTP connections makes it very difficult to measure the mediated query perfo...

For the four-state protocol of quantum key distribution, optimum sets of probe parameters are calculated for the most general unitary probe in which each individual transmitted photon is made to interact with the probe so that the signal and the probe are left in an entangled state, and projective measurement by the probe, made subsequent to projective measurement by the legitimate receiver, yi...

For the four-state protocol of quantum key distribution, optimum sets of probe parameters are calculated for the most general unitary probe in which each individual transmitted photon is made to interact with the probe so that the signal and the probe are left in an entangled state, and projective measurement by the probe, made subsequent to projective measurement by the legitimate receiver, yi...

To support the quality of service (QoS) requirements of embedded multimedia applications, such as real-time audio and video, electronic mail and fax, and Internet telephony, off-theshelf middleware like CORBA must be flexible, efficient, and predictable. Moreover, stringent memory constraints imposed by embedded system hardware necessitates a minimal footprint for middleware that supports multi...

Route optimization enables mobile nodes to directly communicate with one another. This is an important efficiency benefit of modern mobility protocols like Mobile IPv6 or the Host Identity Protocol. However, route optimization can introduce the possibility for a new type of amplified flooding attacks if designed without care: An attacker may misuse the protocol to trick its peer into redirectin...

This paper proposes a robust privacy-preserving secure anonymous zone routing protocol for military tactical networks. Since much of works have been focused on secure anonymous communications in either reactive protocols or proactive protocols, no research has been dedicated to the secure anonymous hybrid routing protocol. In particular, we propose the hybrid routing location-centric communicat...

Abstract— CSMA/CA protocols such as IEEE 802.11b are considered to be attractive MAC protocols for wireless LANs. In this paper, we extend a saturation throughput model for the IEEE 802.11 Distributed Coordination Function (DCF) MAC protocol to finite loads. The analytical model can help in the optimization of the protocol parameters as well as leading to the performance modeling of multi-hop a...

The NASA Technical Report Server (NTRS), a World Wide Web report distribution NASA technical publications service, is modified for performance enhancement, greater protocol support, and human interface optimization. Results include: Parallel database queries, significantly decreasing user access times by an average factor of 2.3; access from clients behind firewalls and/ or proxies which trunca...