On localized application-driven topology control for energy-efficient wireless peer-to-peer file sharing

Wireless Peer-to-Peer (P2P) file sharing Is widely envisioned as one of the major applications of ad hoc networks in the near future. This trend is largely motivated by the recent advances in high-speed wireless communication technologies and high traffic demand for P2P file sharing applications. To achieve the ambitious goal of realizing a practical wireless P2P network, we need a scalable topology control protocol to solve the neighbor discovery problem and network organization problem. Indeed, we believe that the topology control mechanism should be application driven in that we should try to achieve an efficient connectivity among mobile devices in order to better serve the file sharing application. We propose a new protocol, which consists of two components, namely, Adjacency Set Construction (ASC) and Community-Based Asynchronous Wakeup (CAW). Our proposed protocol is shown to be able to enhance the fairness and provide an incentive mechanism in wireless P2P file sharing applications. It is also capable of increasing the energy efficiency. © 2008 IEEE.published_or_final_versio

On Topology Control of Wireless Peer-to-Peer File Sharing Networks: Energy Efficiency, Fairness and Incentive

Given the recent rapidly developing high speed wireless communication technologies and high traffic demand for P2P file sharing applications, wireless P2P file sharing is widely reckoned as a key component of the next generation communication network. However, running P2P applications in a wireless medium entails different constraints compared with those in the traditional wired Internet. One of the challenges is that portable wireless devices are energy-limited since they are battery-operated and the battery has inevitably limited life. Fairness and incentive are also important issues. Unfortunately, designing a protocol taking all these factors into account is still a relatively unexplored problem. We propose a topology control protocol called TCP2P for wireless P2P file sharing networks. TCP2P increases the fairness and provides incentive in wireless P2P file sharing applications and is energy-conserving.published_or_final_versio

Community-based asynchronous wakeup protocol for wireless peer-to-peer file sharing networks

Ubiquitous Peer-to-Peer (P2P) networking is widely expected to be manifested in a wireless environment in the near future. However, to realize such an interesting mobile computing platform, energy efficiency is one of the most critical resources management issues yet to be tackled. Unfortunately, energy efficient wireless P2P networking is still a relatively less explored topic as it is quite challenging to tackle the energy management problem without centralized control. In this paper, we meet this research challenge by proposing a new distributed protocol, called Community-Based Asynchronous Wakeup Protocol, CAWP, for energy conservation in wireless P2P file sharing networks. Simulation results show that our proposed CAWP is found to be highly effective in that it can remarkably increase the energy efficiency of the participants in a wireless P2P system. © 2005 IEEE.published_or_final_versio

Non-linear analysis and moment redistribution of prestressed concrete members

Most of the existing codes of practice allow moment redistribution to be applied to reinforced concrete design with upper limits of 20–30%. It is, however, questionable whether the same limits are valid for the design of prestressed concrete members. Research in this area dates back to the 1950s, but investigations have mainly focused on the behaviour at different servicing limits and the effects of various parameters. Work has seldom been done on the effects of moment redistribution on structural safety, as the load-carrying capacity can be compromised with increase in moment redistribution owing to the limited ductility of concrete sections. In the present study, a method for non-linear finite-element analysis is developed to examine the relationship between the reduction in load-carrying capacity and the moment redistribution applied to the design of prestressed concrete members, and how such a relationship is affected by section deformability and plastic hinge lengths. Results suggest that due care must be exercised when codified moment redistribution for prestressed concrete members is applied.published_or_final_versio

Collapse mechanism and robustness of precast segmental bridges

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HIGH-ENERGY EMISSIONS FROM THE GAMMA-RAY BINARY LS 5039

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Fermi-lat Detection Of Pulsed Gamma-rays Above 50 Gev From The Vela Pulsar

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MULTI-WAVELENGTH EMISSIONS FROM THE MILLISECOND PULSAR BINARY PSR J1023+0038 DURING AN ACCRETION ACTIVE STATE

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Controlled supramolecular assembly of gold (III) amphiphiles in aqueous media

202309 bcchAccepted ManuscriptRGCPublishe

Static-dynamic distribution factors method for tall building analysis

A new approximate method of analysing three-dimensional tall building structures is presented. The method is a further development of the distribution factors method developed by Leung. It is proposed, based on the observation that the pattern of the out-of-plane displacement and rotation of the joints of a particular floor generally follows the shape of its own natural modes, to include the eigenvectors of the floor out-of-plane deflection as distribution factors in the analysis. By using both static and dynamic distribution factors to reduce the number of DOF, an efficient and yet sufficiently accurate analysis method is developed. Numerical examples demonstrate that in general the addition of only a few number of eigenvectors can significantly improve the accuracy of the results. © 1993.link_to_subscribed_fulltex