a simple protocol to detect wormhole attacks in wireless ad hoc networks
Báo cáo toán học: " A novel algorithm to form stable clusters in vehicular ad hoc networks on highways" doc
... cluster-head The cluster stability can also in uence the signaling overhead A frequently changing clustering structure results in an increase in maintenance messages and thus increasing the load on ... registers at a CH as a member node To cope with the VANET topology changes, nodes maintain a table containing a list of the neighboring nodes with which they can exchange information The protocol mainly ... real-time information about road conditions allowing them to react on time For example, warning messages sent by vehicles involved in an accident enhances traffic safety by helping the approaching...
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Báo cáo hóa học: " A survey of performance enhancement of transmission control protocol (TCP) in wireless ad hoc networks" pptx
... [60] Abbreviations AP: access point; ADSN: ACK duplication sequence number; ACKs: acknowledgements; AODV: ad hoc on-demand distance vector; ATCP: ad hoc TCP; ADV: adaptive distance vector; APS: adaptive ... However, only a single path is used for data transmission and the second one maintained as a backup path to minimise the chance of route unavailability To select a primary path and a backup path, two ... 7, which adds an extra data packet (DATA2) to the normal exchange procedure of RTS/CTS/DATA/ACK, where DATA2 is a packet moving in the opposite direction to that of packet DATA1 In addition,...
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A protocol to mitigate routing misbehaviour under mobile ad hoc networks
... path manager in turn adapts node behavior according to the reputation ratings and takes action against misbehaving nodes The reputation here in context refers to the proper routing and forwarding ... integrity and operation by attacking or falsifying routing information Protecting their own interest remain their top main priority Models to investigate such behavior in a distributed setting already ... isolating misbehaving nodes, thus making denying cooperation an unattractive thing to In this way, it is hoped that misbehavior can be mitigated leading to restoration of normal functioning of...
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Sprite: A Simple, Cheat-Proof, Credit-Based System for Mobile Ad-Hoc Networks potx
... security can be argued in a similar way as the unicast case As route-discovery broadcast can be viewed as a special case of multicast, this approach can also be applied to multicast if multicast is ... connection and has backup power A mobile node can also use a desktop computer as a proxy to report to the CCS In order to save bandwidth and storage, instead of requiring the whole message as a report, ... misbehaving nodes, and a pathrater, which selects routes that avoid the identified nodes Their simulations showed that these two tools can maintain the total throughput of an ad hoc network at an acceptable...
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Báo cáo hóa học: " Research Article Tree-Based Distributed Multicast Algorithms for Directional Communications and Lifetime Optimization in Wireless Ad Hoc Networks" pptx
... 2256–2261, Anchorage, Alaska, USA, May 2003 [5] A K Das, R J Marks, M El-Sharkawi, P Arabshahi, and A Gray, “MDLT: a polynomial time optimal algorithm for maximization of time -to- first-failure in energy ... omnidirectional antenna) uses search-and-grow cycles to discover a min-max tree Such feature is beneficial to implement it in a distributed fashion We have formulated a data structure to maintain locally ... similar in principle to DMMT-OA for the formation of min-max tree, in the sense that new nodes are added into the tree in search-and-grow cycles We must first incorporate the antenna beamwidth into...
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Topology Control in Wireless Ad Hoc Networks phần 1 pdf
... links Istituto di Inform atica e Telem atica Introduction: 5/7 5th ACM MobiHoc – Tokyo, May 24, 2004 An example (Point Graph) Comm graph Symmetric Comm graph Istituto di Inform atica e Telem atica ... detrimental for TC? – Multi-hop data traffic – Topology control in the protocol stack Towards and implementation of TC: the CLUSTERPOW and NTC-PL protocols – Istituto di Inform atica e Telem atica 5th ... node u a transmitting range RA(u) in (0,rmax], where rmax is the maximum transmitting range (common to all the nodes) Assuming β =1, the energy cost of a range assignment is defined as ∑u (RA(u))α...
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Topology Control in Wireless Ad Hoc Networks phần 2 ppsx
... 9/12 5th ACM MobiHoc – Tokyo, May 24, 2004 The COMPOW protocol In [Narayanaswamy et al.02], the authors introduce COMPOW, a protocol that attempts to determine the CTR for connectivity in a distributed ... Istituto di Inform atica e Telem atica the CTR: 3/12 5th ACM MobiHoc – Tokyo, May 24, 2004 CTR: probabilistic approaches In many realistic scenarios, node positions are not known in advance ... distributed way Nodes maintain a routing table for each power level, and set as the common transmit power the minimum level such that the corresponding routing table contains all the nodes in the...
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Topology Control in Wireless Ad Hoc Networks phần 3 potx
... unidirectional links really useful? – Recent experimental [MarinaDas02] as well as theoretical [Blough et al 0 2a] results seem to say: no Having a connected backbone of symmetric links would ease the integration ... the minimum-power path in G’ and in G In words, the power stretch factor is a measure of the increase in the energy cost due to the fact that we communicate using the routing graph G’ instead ... 5th ACM MobiHoc – Tokyo, May 24, 2004 The Range Assignment problem So far, all the nodes have the same transmitting range What happens in the more general case in which nodes may have different...
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Topology Control in Wireless Ad Hoc Networks phần 4 pot
... of broadcast stretch factor of a subgraph G’ of G can be defined Also in this case, the goal is to find sparse broadcast spanners that can be computed in a distributed and localized fashion ... Existing TC protocols RodopluMeng99: – – RamanathanRosales-Hain00: – – Goal: minimize the maximum of nodes transmitting ranges while maintaining connectivity Drawback: centralized approach ... quality” information – Generate a connected topology free of unidirectional links Istituto di Inform atica e Telem atica TC protocols: 2/12 5th ACM MobiHoc – Tokyo, May 24, 2004 TC protocols: information...
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Topology Control in Wireless Ad Hoc Networks phần 5 ppsx
... Istituto di Inform atica e Telem atica TC protocols: 9/12 5th ACM MobiHoc – Tokyo, May 24, 2004 The optimal value of k Optimal value of k for increasing n 10 k Optimal value 10 100 1000 n Optimal ... neighbor-based TC protocol: the LINT protocol of [RamanathanRosalesHain00]: – – – Basic idea: try to keep the number of neighbors of every node within a low and high threshold centered around an “optimal ... [Blough et al 03]) Istituto di Inform atica e Telem atica TC protocols: 11/12 5th ACM MobiHoc – Tokyo, May 24, 2004 The XTC protocol XTC is a very recent protocol by the same author of CBTC [WattenhoferZollinger04]...
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Topology Control in Wireless Ad Hoc Networks phần 6 potx
... and LINT [RamanathanRosales-Hain00] k-neighbors based protocols are explicitly designed to deal with mobility Istituto di Inform atica e Telem atica Mobility: 9/10 5th ACM MobiHoc – Tokyo, May ... In realistic scenarios: radio coverage area influenced by many factors (obstacles, buildings, existing infrastructure, weather conditions, etc.), and it is hardly regular Including too many ... assume that the link probability is a non-increasing function of the distance – With this model, the radio coverage area in general is not regular A similar model has been proposed in [Farago02]...
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Topology Control in Wireless Ad Hoc Networks phần 7 ppt
... ACM MobiHoc – Tokyo, May 24, 2004 The CLUSTERPOW protocol The protocol is an extension of the COMPOW protocol of [Narayanaswamy et al.02] The goal of the CLUSTERPOW [KawadiaKumar03] is to overcome ... routing table for level i, RTi, is updated by a routing daemon (one for each level), and contains all the nodes that are reachable by u using power at most i Istituto di Inform atica e Telem atica ... Istituto di Inform atica e Telem atica Open issues: 8/11 5th ACM MobiHoc – Tokyo, May 24, 2004 TC in the protocol stack Where should TC be positioned in the protocol stack? No clear answer in...
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Topology Control in Wireless Ad Hoc Networks phần 8 ppt
... http://www.imc.pi.cnr.it/~santi A survey paper on TC: P Santi, “Topology Control in Wireless Ad Hoc and Sensor Networks , Tech Rep IIT-TR-04/2003, Istituto di Informatica e Telematica, Pisa Italy, March 2003 Available ... technological problems with per-packet TC will be solved, a combination of periodical TC (to adjust the maximum transmit power and send broadcast messages) and per-packet TC (to send point-topoint messages) ... best choice Istituto di Inform atica e Telem atica Level-based TC: 16/16 5th ACM MobiHoc – Tokyo, May 24, 2004 Bibliography A bibliography on TC is available on-line at the following URL: http://www.imc.pi.cnr.it/~santi...
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Báo cáo hóa học: " Research Article A Novel Approach to Detect Network Attacks Using G-HMM-Based Temporal Relations between Internet Protocol Packets" pot
... training data and two weeks of test data Among these datasets, we used attack-free training data for normal behavior modeling, and attack data was used to the construction of anomaly score in ... constraints are linear in w and b This has the advantage that parameters in a quadratic programming (QP) a ect only the training time and not the quality of the solution This problem is tractable, ... nonseparable, forcing zero training error will lead to poor generalization To take into account the fact that some data points may be misclassified, we introduce soft margin SVM using a vector of...
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Báo cáo khoa học: A simple protocol to study blue copper proteins by NMR pot
... NMR protocol is an important tool to study paramagnetic proteins Plastocyanin is a good model system to address features of paramagnetic copper proteins in terms of assignment strategy Indeed, ... four belong to Cas peaks 1–4 in Table and to Cbs peaks 5–11 in Table They are also highlighted in Fig 3A and 3B Detection of fast relaxing signals: tailored CBCA(CO)NH and CBCANH A 3D version ... recycle and polarization transfer delays allows to identify 11 resonances that clearly experience a substantial gain in signal intensity when comparing a diamagnetic HSQC experiment with a tailored...
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Báo cáo sinh học: " A simple algorithm to estimate genetic variance in an animal threshold model using Bayesian inference" docx
... software package All authors took part in discussions, made input to the writing and read and approved the final manuscript Submit your next manuscript to BioMed Central and take full advantage ... as an option in the Gibbs sampling module of the DMU statistical software package [9], where it is adapted to handle multivariate genetic analyses including binary, ordered categorical and Gaussian ... (AnimA) applied to the same data sets resulted in samples of genetic variance drifting towards infinity Given that the data sets could be appropriately analyzed (no parental phenotypes) with a...
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Báo cáo hóa học: " A New Strategy to Improve Proactive Route Updates in Mobile Ad Hoc Networks" ppt
... forward each data packet towards the destination The advantage of this strategy is that routes are adaptable to the dynamically changing environment of MANETs, since each node can update its routing ... during data transmission The disadvantage of this strategy is that each intermediate node must store and maintain routing information for each active route and each node may require to be aware ... Therefore, each intermediate node forwards these packets according to the information kept in the header of each packet This means that the intermediate nodes not need to maintain up -to- date routing information...
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Báo cáo hóa học: " A survey and taxonomy of distributed certificate authorities in mobile ad hoc networks" doc
... communication overhead and increases the efficiency of certificate management, as certificates are always available to each node at a local repository, few hops away Chaddoud et al [2] proposed a DCA ... regular nodes In addition, the administrator and CHs have directories to save the certificates Each CH is a central CA for its cluster members It is initialized by the administrator or by a coalition ... mobile wireless ad hoc networks, Technical Report, Sandia National Laboratories, (2003) G Chaddoud, K Martin, Distributed certificate authority in cluster-based ad hoc networks Wireless Communications...
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Báo cáo hóa học: "Review Article Multicast Routing Protocols in Mobile Ad Hoc Networks: A Comparative Survey and Taxonomy Osamah S. Badarneh and Michel Kadoch" pdf
... established and maintained, multicast routing protocols are classified into the following two approaches (a) The Source-Initiated approach, in which a multicast group is initiated and maintained by ... (very scalable) Fireworks: An Adaptive Multicast/Broadcast Protocol Protocol Description Fireworks [64] is a hybrid 2-tier multicast/broadcast protocol that adapts to maintain performance, given ... be incurred to maintain Adaptive Demand Driven Multicast Routing (ADMR) Protocol Discussion ADMR adapts well to the network load, and also avoids unnecessary redundancy One of its shortcomings...
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