applications and recent developments in ad hoc networks

... communication to maintain the connectivity, in which case the networks are called as mobile ad hoc networks (MANET) Mobility is not, however, a requirement for nodes in ad hoc networks, in ad hoc networks ... Aspects Ad hoc networks may apply either hierarchical or flat infrastructure both in logical and physical layers independently As in some flat ad hoc networks the connectivity is main-tained directly ... calculation and radio transmission are constrained, as discussed e.g in [3] In addition, the available bandwidth and radio frequencies may be heavily restricted and may vary rapidly Finally, as

Ngày tải lên: 22/03/2014, 15:21

... multi-channel MAC protocols in ad hoc networks Jari Nieminen*and Riku Jäntti Abstract Since delay and throughput are important Quality of Service parameters in many wireless applications, we study ... jari.nieminen@aalto.fi Department of Communications and Networking, School of Electrical Engineering, Aalto University, P.O Box 13000, 00076 Aalto, Finland © 2011 Nieminen and Jäntti; licensee Springer ... ad hoc network [1] Furthermore, delay and throughput are important Quality of Service (QoS) parameters in many applications [2] and hence, the performance of multi-channel MAC schemes in ad hoc

Ngày tải lên: 20/06/2014, 22:20

... longitudinal effects over 5 years of running and ageing on the development of radiographic and clinical OA of the knees, hands and lumbar spine Running did not accelerate the development of radiographic ... breakdown, including bone loss, in adult periodontitis Brandt and colleagues [30] recently examined the effects of doxycycline on OA progression in a randomized, placebo-controlled, double-blind trial ... approaches are broader and include activating or increasing the level of factors able to inhibit proinflammatory cytokines or other catabolic factors Interleukin-1β For specific inhibition of the

Ngày tải lên: 09/08/2014, 07:20

... sustaining inhalation injury, a new standard of medical therapy has not emerged Renal failure as a contributor to adverse outcome in burns has been reinforced by recent data generated in Scandinavia ... objectives and fluids administered in the approach recommended by the Park-land group are frequently exceeded.[3] What is contempo-rary thinking about initial fluid administration in the setting of ... Survival in the overall study cohort has remained at approximately 95% Deaths from burn injury increased with advanced age and burn size and in the presence of inhalation injury The leading cause

Ngày tải lên: 13/08/2014, 23:20

... Trang 1MOBILITY-ADAPTIVE CLUSTERING AND NETWORK-LAYER MULTICASTING IN MOBILE AD HOC NETWORKS ER INN INN NATIONAL UNIVERSITY OF SINGAPORE 2006 Trang 2MOBILITY-ADAPTIVE CLUSTERING AND NETWORK-LAYER ... family: Dad, Mum, Chinchin, Chinming, Sinyee, Andy, and Chenhui for unconditionally supporting my decision to study PhD, for selflessly loving me, for tirelessly encouraging me whenever I am feeling ... perform clustering and must not involve network-wide flooding It should incur as minimum clustering overhead as possible in view of the scarce resources in MANETs Optimal clustering may not be

Ngày tải lên: 14/09/2015, 17:55

... and robustness of wireless mobile ad-hoc networks are limited due to many factors, such as the node resource and changing topologies We are therefore interested in investigating the outstanding ... the routing protocol has its own header, our coding header sits in between the routing and MAC layer headers Otherwise, it sits between the IP and MAC headers Only the shaded fields in Figure ... coding including two components of the opportunistic character, i.e opportunistic listening and opportunistic coding We also explain the packets coding and decoding algorithm implemented in this

Ngày tải lên: 16/10/2015, 11:59

... throughput due to inherent fading properties of wireless channels Transport Layer in ad-hoc and sensor Trang 9Problems in Wireless Networks Leads to OOO packets Trang 10Problems in Wireless Networks ... HTTP response FIN ACK FIN ACK Connection Termination Client Server Transport Layer in ad-hoc and sensor Trang 5TCP MechanismsSliding Window Slow Start  Is triggered at the beginning of connection ... Communications Magazine. Transport Protocol for Ad-hoc Networks", in Proc of MobiHoc, 2003.  Nitin H Vaidya, “TCP for Wireless and Mobile Hosts”. TCP over Wireless Links”. Networks”. Trang

Ngày tải lên: 24/05/2016, 22:34

... trapped in rubble, controlling unmanned vehicles and trans-portation systems, clearing mine-fields, and spreading military assets (e.g., robots, mini-submarines, etc.) under harsh and bandwidth ... FGA and the spatial game set up among it and the nodes in its neighborhood NSEG is a good candidate for the node spreading class of applications used in both military tasks and commercial applications ... University Production and hosting by Elsevier B.V All rights reserved. Introduction The main performance concerns of mobile ad hoc networks (MANETs) are topology control, spectrum sharing and power consumption,

Ngày tải lên: 13/01/2020, 02:41

... effluents containing a variety of contaminants (either organic or inorganic) and mi-croorganisms The common assembly of this cell is single-chamber and double single-chamber system In single-single-chamber ... nanocatalyst are also discussed Finally, challenges associated with platinum and carbon support platinum in improving electron and charge transfer between biocatalyst and air-cathode electrode are ... is, in general, a suitable mechanism that employed for the formation of different oxygen-containing intermediates (such as OH, O2
, O, H2O2 and HO2
) under both acidic and alkaline media [4] In

Ngày tải lên: 24/09/2020, 04:50

... effluents containing a variety of contaminants (either organic or inorganic) and mi-croorganisms The common assembly of this cell is single-chamber and double single-chamber system In single-single-chamber ... Finally, challenges associated with platinum and carbon support platinum in improving electron and charge transfer between biocatalyst and air-cathode electrode are summarized © 2019 Publishing ... is, in general, a suitable mechanism that employed for the formation of different oxygen-containing intermediates (such as OH, O2
, O, H2O2 and HO2
) under both acidic and alkaline media [4] In

Ngày tải lên: 17/03/2021, 20:21

... Long-Hop and Short-Hop Routing in Mobile Ad Hoc Networks: A Comprehensive Study M Tarique, A Hossain, R Islam and C Akram Hossain Dept of Electrical and Electronic Engineering, American International ... transmission power level was the main focus of this study The energy consumption pattern and energy model in ad hoc networks have been investigated in [20] and [21] According to these models, the energy ... throughput, shadowing effects, energy consumptions, MAC overhead, network connectivity, routing overhead, end-to-end delay, packet loss and mobility which are explained in the following sub sections

Ngày tải lên: 27/07/2022, 11:27

... antenna arrays in ad hoc networks is to use standard beamforming, that is, to point the main lobe of EURASIP Journal on Wireless Communications and Networking Interference Destination S Source ... Ramanathan, and N H Vaidya, “Using directional antennas for medium access control in ad hoc networks, ” in Proceedings of the 8th ACM Annual International Conference on Mobile Computing and Networking ... Ramanathan, “On the performance of ad hoc networks with beamforming antennas,” in Proceedings of the 2nd ACM International Symposium on Mobile Ad Hoc Networking & Computing (MobiHoc ’01), pp 95–105, Long...

Ngày tải lên: 21/06/2014, 22:20

... Analytical modeling The SIMM model uses two Markov chains with discrete parameters and states (0, 1, and 2), to represent movements in the x- and y-coordinate, with changes in coordinates x and y assumed ... representing not only patterns with only one increment in the x and y coordinates (e.g., the SIMM model), but also with several increment values in these coordinates, with a smooth variation in this increment ... [3] K H Wang and B Li, “Efficient and guaranteed service coverage in partitionable mobile ad hoc networks, ” in Proceedings of the 21st Annual Joint Conference of the IEEE Computer and Communications...

Ngày tải lên: 22/06/2014, 19:20

... grouping or clustering issues for reducing traffic overhead and broadcast storm problems of MANETs, reducing the rekeying costs in Figure 2: A elliptic curve with P + Q + R = O key updating and increasing ... Joining = O (1) Delete = O (log n) Joining = O(log n) Node joining/delete Node operations Max = 2h − Min = Fab(h + 2) − Max = 2h − Min = Fab(h + 2) − Max = n Min = Max = n Min = Max = 2h − Min ... efficient and scalable for numerous mobile nodes in ad hoc networks [13] [14] [15] [16] References [1] S M Das, H Pucha, and Y C Hu, “Distributed hashing for scalable multicast in wireless ad hoc networks, ”...

Ngày tải lên: 21/06/2014, 11:20

... beamforming consists of two stages, local broadcasting and cooperative transmission In particular, in local broadcasting, each source node broadcasts its databearing signal to the other ones in the ... Journal on Advances in Signal Processing which is essentially equivalent to SINRi It should be notified that the SINRi based analysis and optimization are quite involved in cooperative ad hoc networks, ... multiple beamforming in wireless ad hoc networks: two concurrent beams are formed; K = 10 nodes in the source/destination cluster; M = source/destination nodes; K − M = unintended destination nodes...

Ngày tải lên: 22/06/2014, 19:20

... concern and are increasingly important Ad hoc networks cannot be used in practice if they are not secure, because ad hoc networks are subject to various attacks Wireless communication links can be intercepted ... used in the DCA (namely, Ch(v) and Join(v, u)) [3] In the following we use Cluster(v) and ClusterHead to indicate the set of nodes in the cluster whose ClusterHead is v and the ClusterHead of ... “Securing Ad Hoc networks, ” IEEE Network, vol 13, no 6, pp 24–30, 1999 [8] M Steenstrup, “Cluster-based networks, ” in Ad Hoc Networking, C E Perkins, Ed., chapter 4, pp 75–138, Addison-Wesley, Reading,...

Ngày tải lên: 23/06/2014, 00:20

... Chen and K Nahrstedt, “Distributed quality-of-service routing in ad hoc networks, ” IEEE J Select Areas Commun., vol 17, no 8, pp 1488–1505, 1999 [4] B Das and V Bharghavan, “Routing in ad- hoc networks ... routing (AQOR) in mobile ad hoc networks, ” Journal of Parallel and Distributed Computing, vol 63, no 2, pp 154–165, 2003 [11] C Zhu and M S Corson, “QoS routing for mobile ad hoc networks, ” in Proc ... and S K Tripathi, “Signal stability-based adaptive routing (SSA) for ad hoc mobile networks, ” IEEE Pers Commun., vol 4, no 1, pp 36–45, 1997 [10] Q Xue and A Ganz, Ad hoc QoS on-demand routing...

Ngày tải lên: 23/06/2014, 00:20

... should be evenly spread in the network 2.3.2.1 Creating a dominating set In [26], a dominating set is created to handle the discovery of services A dominating set is defined as a set that nodes ... as ring head The ring heads can then create level rings, and so on Each ring head caches the summary of the services hosted in its ring A query for a service then travels up and down in the hierarchy ... scheme could be only efficient in almost static networks, but it has the advantage of combining routing and resource discovery 2.3.2.2 Backbone and selective forwarding In order to make the service...

Ngày tải lên: 05/10/2015, 21:22

... Introduction 1.1 Introduction to Ad Hoc Networks 1.1.1 Advantages & Applications of Ad Hoc Networks 1.1.2 Challenges Faced by Ad Hoc Networks 1.1.3 Routing ... key joint mobile nodes Hidden-terminal and exposed-terminal problems are also faced by mobile ad hoc networks In a mobile ad hoc network, mobile nodes have both power and bandwidth constraints, ... N1, N2, N3, N4 and N5 then act as routers while establishing the connection between N0 and N6 1.1.1 Advantages & Applications of Ad Hoc Networks The major advantage of a mobile ad hoc network is...

Ngày tải lên: 10/11/2015, 11:07

... can handle mobility of nodes It minimizes routing loads and enhances expandability of network by allowing participating nodes to authenticate each other without being interrupted by joining the ... bootstrapping, applying a DCA private key, joining a new CH, evicting an existing CH, refreshing CH shares In Bootstrapping operation, to construct the shared key and establish a (k,n) threshold sharing ... even in the destination cluster or position Also, we can consider two kind of client nodes mobility, nodes mobility inside the nodes administrative domain and between the administrative domains...

Ngày tải lên: 20/06/2014, 22:20