179,536 research outputs found
Link stability estimation based on link connectivity changes in mobile ad-hoc networks
No full textDear Wang,
Re: Link Stability Estimation Based on Link Connectivity Changes in Mobile Ad-hoc Networks
I have not been able to assess if this is an author version peer-reviewed or is it an author version non peer reviewed. Could you please clarify this so I can proceed to add your paper to Spiral. Spiral digital repository only accept peer-reviewed papers.
30/11/12 author has confirmed peer reviewe
Título: De synodo dioecesana libri tredecim ... ; tomus primus
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Título: Opera omnia
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Energy efficiency in ad-hoc wireless networks
No full textIn ad-hoc wireless networks, nodes are typically battery-powered, therefore energy limitations are among the critical constraints in ad-hoc wireless networks' development. The approaches investigated in this thesis to achieve energy efficient performance in wireless networks
can be grouped into three main categories.
1. Each wireless network node has four energy consumption states: transmitting, receiving, listening and sleeping states. The power consumed in the listening state is less than the power consumed in the transmitting and receiving states, but significantly greater than that in the sleeping state. Energy efficiency is achieved if as many nodes as possible are put into the sleeping states.
2) Since energy is consumed for transmission nonlinearly in terms of the transmission range, transmission range adjustment is another energy saving approach. In this work, the optimal transmission range is derived and applied to achieve energy efficient performance in a number of scenerios.
3) Since energy can be saved properly arranging the communication algorithms, network topology management or network routing is the third approach which can be utilised in combination with the above two approaches. In this work, Geographical Adaptive Fidelity (GAF) algorithms, clustering algorithms and Geographic Routing (GR) algorithms are all utilised to reduce the energy consumption of wireless networks, such as Sensor Networks and Vehicular Networks.
These three approaches are used in this work to reduce the energy consumption of wireless networks. With the GAF algorithm. We derived the optimal transmission range and optimal grid size in both linear and rectangular networks and as a result we show how the network energy consumptions can be reduced and how the network lifetime can be prolonged. With Geographic Routing algorithms the author
proposed the Optimal Range Forward (ORF) algorithm and Optimal Forward with Energy Balance (OFEB) algorithm to reduce the energy consumption and to prolong the network lifetime. The results show that compared to the traditional GR algorithms (Most Forward within Radius, Nearest Forward Progress), the network lifetime is prolonged. Other approaches have also been considered to improve the networks's energy efficient operation utilising Genetic Algorithms to find the optimal size of the grid or cluster. Furthermore realistic physical layer models, Rayleigh fading and LogNormal fading, are considered in evaluating energy efficiency in a realistic network environment
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A Fair and Secure Cluster Formation Process for Ad Hoc Networks
No full textAn efficient approach for organizing large ad hoc networks is to divide the nodes
into multiple clusters and designate, for each cluster, a clusterhead which is responsible for
holding intercluster control information. The role of a clusterhead entails rights and duties.
On the one hand, it has a dominant position in front of the others because it manages the
connectivity and has access to other node¿s sensitive information. But on the other hand, the
clusterhead role also has some associated costs. Hence, in order to prevent malicious nodes
from taking control of the group in a fraudulent way and avoid selfish attacks from suitable
nodes, the clusterhead needs to be elected in a secure way. In this paper we present a novel
solution that guarantees the clusterhead is elected in a cheat-proof manner
A multi-protocol framework for ad-hoc service discovery
No full textDiscovering the appropriate services in ad-hoc computing environments where a great number of devices and software components collaborate discreetly and provide numerous services is an important challenge. Service discovery protocols make it possible for participating nodes in a network to locate and advertise services with minimum user intervention. However, because it is not possible to predict at design time which protocols will be used to advertise services in a given context/environment, it is now becoming clear that dynamic discovery mechanisms are required by mobile nodes to cope with the heterogeneity of discovery platforms. Existing adaptive mobile middleware solutions such as ReMMoC and INDISS have investigated this style of dynamic discovery. However, these have yet to consider the emerging suite of protocols for discovery in ad-hoc networks. In this paper we present a component-based service discovery framework for the development of an adaptive multi-personality service discovery middleware, which will operate in diverse environments e.g. fixed and ad-hoc networks. This supports a common architecture for individual discovery protocols to enhance configurability and re-configurability of the framework, and minimize resource usage through component reuse. Finally, to evaluate this framework we investigate the development of four existing ad-hoc service discovery protocols using our approach
Corrective Ad Valorem and Unit Taxes: A Welfare Comparison
No full textThe ad valorem versus unit taxes debate has traditionally emphasized tax yield. For this criterion, ad valorem taxes outperform unit taxes in terms of welfare for a wide range of imperfect competition settings, including Dixit-Stiglitz monopolistic competition. Yet, in a number of policy fields, such as environmental, health or trade economics, policy makers apply taxes to target the production/consumption volume in an industry, i.e. aim at a certain corrective effect rather than tax yield. This paper compares the two tax instruments with respect to equal corrective-effect in a Dixit-Stiglitz setting with love of variety, entry, exit, and redistribution of tax revenues. We find that unit taxes lead to more firms in the industry, less output per firm, less tax revenue, but higher welfare compared to ad valorem taxes.Externalities; Monopolistic competition; Taxes; Specific taxes; Welfare
Título: De synodo dioecesana libri tredecim ... ; tomus secundus
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Un vettore NON-virale contenente un elemento S-MAR (Scafold/Matrix Attachment)consente un'espressione persistente nel tessuto epatico nel modello murino.
No full textUn vettore ideale dovrebbe consentire l'espressione di un transgene senza
alcuna limitazione di sicurezza e di riproducibilità. Qui riportiamo lo sviluppo di un nuovo vettore NON-virale basato su DNA episomale plasmidico (pDNA) che sembra soddisfare al pieno le caratteristiche del vettore ideale nel tessuto epatico. Questo pDNA deriva dalla combinazione tra un promotore epatospecifico (AAT promoter) posto a monte del transgene e un elemento
S-MAR (Scafold/Matrix Attachment) posto a valle, mentre il reporter è gene della luciferasi. L'applicazione nel tessuto epatico è stata effettuata mediante iniezione ad alta pressione per via vena caudale del modello murino (hydrodynamic delivery). L'espressione a lungo termine è stata dimostrata attraverso diverse metodiche in vivo ed in vitro. In vivo, mediante l'utilizzo del Xenogen in vivo bio-imaging ai tempi
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