comparison of the maximal spatial throughput of aloha and csma in wireless ad hoc networks
Báo cáo hóa học: " A survey and taxonomy of distributed certificate authorities in mobile ad hoc networks" doc
... scalability and the throughput of these networks will decline rapidly with the increase of network nodes The solution for this problem is clustering The use of clustering in DCAs has two advantages ... 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 ... overhead At the beginning of sequential update, a coalition of t servers, instead of all servers, update their shares by applying the traditional proactive share update scheme The remaining nodes...
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Báo cáo hóa học: " A survey of performance enhancement of transmission control protocol (TCP) in wireless ad hoc networks" pptx
... improving the performance of TCP on wireless ad hoc networks, those readers who are interested in single-hop wireless networks are referred to [17] The readers interested in the surveys of TCP ... challenges TCP faces in wireless ad hoc networks Section presents a survey of the approaches available to improve the performance of TCP in wireless ad hoc networks and provides taxonomy of these approaches ... considering the complexity of wireless networks With the advent of wireless technology TCP was also employed in wireless environments In wireless technology, changes were made in the lower layers of the...
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Báo cáo hóa học: " Research Article Usability of Legacy p2p Multicast in Multihop Ad Hoc Networks: An Experimental Study Andrea Passarella and Franca Delmastro" pdf
... multihop ad hoc networks and understand how they could be developed in practice From this standpoint, GC applications are quite interesting They fit well the overall features of multihop ad hoc networks ... level also in ad hoc networks is the fact that in this way, the burden of managing the multicast structure falls exclusively on nodes that are actually interested in being part of the multicast ... likely in ad hoc networks, due to the intrinsic instability of wireless links As shown in the following, we have actually experienced such failures several times Scribe has been developed on top of...
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Báo cáo hóa học: " Research Article On the Throughput Capacity of Large Wireless Ad Hoc Networks Confined to a Region of Fixed Area" pptx
... critical, the further increase of the spatial node density (and hence the total node number) does not lead to the further increase of the SINR (since now interference dominates noise and grows at the ... power and the effect of the increasing SINR is able to overcome the effect of increasing number of relays thus leading to an overall increase of the achievable throughput When the spatial node density ... proportionally to the signal power resulting in constant SINR and hence, independence of the throughput √ the node density Thereof fore, the effect found in [1] (1/ n dependence due to the increase of the number...
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Báo cáo hóa học: " On the Geometrical Characteristics of Three-Dimensional Wireless Ad Hoc Networks and Their Applications" pptx
... represents the local topological status of the wireless ad hoc network To a certain extent, the node locations and their corresponding degrees would affect the configuration of the wireless ad hoc network ... value of the max-flow and the node number of a wireless ad hoc network when the covering radius keeps constant Another important observation is that, if the covering radius R is relatively small, the ... randomly chosen in each random graph, and the algorithm of the C++ program follows that in [12] The mean value of the max-flows is then normalized by (n − 1), where n is the number of nodes in...
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Báo cáo hóa học: "Research Article An Empirical Model for Probability of Packet Reception in Vehicular Ad Hoc Networks" pdf
... on the configuration parameters and assuming the differentiability of the probability of reception in the configuration parameters, we infer the differentiability of the fitting parameters in the ... (potentially) in nite retransmissions by a node The work in [6–8] incorporated a nonidealistic sensing of the radio channel and thus addressed the problem of hidden terminals The work in [9, 10] ... application’s constraints Typically, one of the constraints dominates the others, that is, the dominant constraint requires a certain (dominant) transmission power; however other constraints would likewise...
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Báo cáo hóa học: " Research Article Origins of Stochasticity and Burstiness in High-Dimensional Biochemical Networks" docx
... participating in the process, including individual molecules or their aggregates There is no unique way of representing the biochemical machinery in mathematical form: depending on the level of structural ... N, and the thermodynamic equilibrium expressed in the LMA in chemical kinetics [44] The latter assumes, in addition to the fact that the fixed point is the equilibrium point, existence of the ... to see that now the fixed point is located in the origin of coordinates and that the Jacobian matrix in the vicinity of this point is Jim = νi (pim − qim ) (B.10) C Derivation of The Autocorrelation...
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Báo cáo hóa học: " Editorial Quality of Service in Mobile Ad Hoc Networks" ppt
... research interests are in the routing protocols and security in wireless internet and mobile ad hoc networks; algorithms, complexity, power connectivity and coverage in wireless sensor networks; adaptation, ... the IEEE International Conference of Wireless Networks, Communications, and Mobile Computing (IEEE WirelessCom 2005) He is the author of three books and in the process of writing another two ... Associate Professor in the Department of Electrical Engineering and Computer Science at the University of Toledo, USA He received his Ph.D degree from the Chinese Academy of Sciences in 1994 Dr...
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Báo cáo hóa học: " Research Article Intelligent Broadcasting in Mobile Ad Hoc Networks: Three Classes of Adaptive Protocols" pptx
... published broadcast algorithms in depth: the scalable broadcast algorithm and the ad hoc broadcasting protocol We modify these two algorithms in Sections and by incorporating machine learning, and we ... and T Camp, Comparison of broadcasting techniques for mobile ad hoc networks, ” in Proceedings of the 3rd ACM International Symposium on Mobile Ad Hoc Networking and Computing (MOBIHOC ’02), pp ... calculating connected dominating sets for efficient routing in ad hoc wireless networks, ” in Proceedings of the 3rd International Workshop on Discrete Algorithms and Methods for Mobile Computing and...
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Báo cáo hóa học: " Research Article Capacity of Wireless Ad Hoc Networks with Opportunistic Collaborative Communications" pptx
... is obtained by exploiting the results in [6] and by casting the optimal MH problem of [2] in a suitable framework (2) If spatial reuse is employed, the increased interference caused by the opportunistic ... where the minimum has to be taken with respect to both the pair index k and to the node index a2 The signal radiated by a2 cooperates for the decoding of the signal transmitted by sk but, on the ... transmitted by sk but, on the other hand, increases the interference for the reception of the signals of the remaining sources At this point, define A(2) = {s, a2 } and A(2) = A(2) for j = k If...
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Báo cáo hóa học: " Research Article Capacity of Wireless Ad Hoc Networks with Opportunistic Collaborative Communications" pdf
... is obtained by exploiting the results in [6] and by casting the optimal MH problem of [2] in a suitable framework (2) If spatial reuse is employed, the increased interference caused by the opportunistic ... where the minimum has to be taken with respect to both the pair index k and to the node index a2 The signal radiated by a2 cooperates for the decoding of the signal transmitted by sk but, on the ... transmitted by sk but, on the other hand, increases the interference for the reception of the signals of the remaining sources At this point, define A(2) = {s, a2 } and A(2) = A(2) for j = k If...
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On applying network coding to wireless ad hoc networks a study of robustness, efficiency and cross layer synergy
... approaches in the context of coding-aware routing [29] The benefits of network coding in multi-hop wireless networks have been further studied The main idea in this research theme is to exploit the natural ... Organization In Chapter 2, we give a thorough review of literatures in the domain of wireless ad hoc networks, network coding, and P2P content distribution systems The problem of coding-aware routing ... existing routing protocols Some of the routing protocols designed for general multi-hop wireless networks are also very useful for wireless ad hoc networks, so we will also include them in the investigation...
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Stochastic optimal control and performance analysis of wireless ad hoc networks
... ắ hmin ì ìểéỉ ểề ỉể ỉ ỉ ì ề ỉ ểề ắắ ề ậ ỉ ểề ắắ è S0 ỉ ầ ậễễểì ỉ ễểé í wmin ì ỉ ì ì wmin (s) = arg [c(s, a) + Pa hmin (s)] , s S ắẵ aA(s) ệ Pa hmin (s) := E {hmin (a ) | a = s} è ềá wmin ì ... ễỉ ệ Wireless Queueing Model for time-varying channel & topology Assumption: Channel State & Topology State Processes as Irreducible Aperiodic Markov Chain Wireless Queue Scheduling as Independent ... ắ é ệ ễểé í = h = hmin ặể ỉ ể ỉ ễệểể ể è ỉ ề ỉ ềể ỉ ỉ ỉ ề ỉ ề ề ỉ ỉ ì éí ì ểề ỉ ìểéỉ ểề ĩ ìỉìá ỉ ì ề ề ắ ề ĩỉ ì ỉ ểề ĩễé ề è ềì wmin ễểé í = (cwmin ) = J(wmin , s) w = wmin ề ỉ ỉ ề ểệ s S ểệ...
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Implementation and performance study of opportunistic network coding in 802 11 based wireless ad hoc networks using qualnet
... and the back-off mechanism The link layer destination field of the encoded packet is set to the MAC address of one of the intended recipients However, an extra header after the link layer header ... 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 4, is required in every coding header (called the ... infoArray[MAX_INFO_FIELDS]; int packetSize; char *packet; NodeAddress originatingNodeId; int sequenceNumber; int originatingProtocol; int numberOfHeaders; int headerProtocols[MAX_HEADERS]; int headerSizes[MAX_HEADERS];...
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Tài liệu A Comparison of Conventional and Organic Milk Production Systems in the U.S. potx
... labor; other costs; and operating interest Capital ownership costs include the annualized cost of maintaining the capital investment (economic depreciation and interest) in the dairy operation, and ... However, the prior research is limited in terms of the scope and the depth of data supporting the analyses This study addresses these limitations, taking advantage of a unique nationwide data set of ... to the organic approach with the hope of improving farm profitability Despite the growing number of organic dairy operations there is little information about the relative costs and returns of...
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Báo cáo khóa học: Structural and functional comparison of 15S- and 15R-specific cyclooxygenases from the coral Plexaura homomalla potx
... site and mostly on the surface of the catalytic globular domain of the COX protein Protein expression and product analysis The cDNA was cloned into the pFASTBAC1 vector for expression in Sf9 insect ... gave similar conversion of the radiolabelled substrate The Val349Ile mutant of the 15S-COX formed 65% PGF2a and 35% of the 15R-epimer of PGF2a In the case of the 15R-COX, the Ile349Val mutation ... Tris/HCl pH 8.0 containing lM hematin, mM adrenalin, and in some cases 0.5 mM SnCl2 was added The reaction was initiated by addition of 50 lM [1-14C]arachidonic acid and incubations were performed...
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Báo cáo Y học: NMR structure of the HIV-1 regulatory protein Vpr in H2O/trifluoroethanol Comparison with the Vpr N-terminal (1–51) and C-terminal (52–96) domains pot
... nucleic acids and NCp7 Thus, during the early stages of HIV-1 replication, binding of NCp7 to the C-terminal domain (80–96)Vpr [8] may expose the N-terminal (1–39) portion of the protein and allow ... of the a-helices in the 3D structure of the protein The backbone is represented in blue and the hydrophobic amino acid side chain coloured pink Ó FEBS 2002 NMR Structure of the HIV-1 protein ... protein targets The importance of Vpr protein–protein interactions has been clearly demonstrated by the loss of activity of Vpr following certain point mutations [16,38,39] This is one of the main...
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báo cáo hóa học: " Maximal COX-2 and ppRb expression in neurons occurs during early Braak stages prior to the maximal activation of astrocytes and microglia in Alzheimer''''s disease" pdf
... emerging data on the early role of oligomeric and protofibrilic forms of Aβ in AD is very interesting [25,26] Whether COX-2 and cell cycle proteins are part of the molecular mechanisms involved in ... have investigated whether activation/occurrence of microglia and astrocytes in AD brain can be correlated with the neuronal expression of COX-2 and ppRb during AD pathogenesis Staging of AD was ... and quantification of the immunohistochemical data RV has been involved in the collection of the human post mortem brain material TA, WS, PE and AJMR participated in the design of the study and...
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Báo cáo hóa học: " Comparison of p53 and the PDZ domain containing protein MAGI-3 regulation by the E6 protein from high-risk human papillomaviruses" pdf
... target of HPV is the family of PDZ domain-containing cellular proteins PDZ domains consist of 80–90 amino acids and are amongst the most common protein-protein interaction domains found in human cells ... others at degrading p53 It is clear that E6 proteins from high-risk HPV types mediate the degradation of both p53 and several PDZ domaincontaining proteins, including MAGI-3 However, since these ... E6APdependent and E6AP-independent mechanisms, to mediate the degradation of different PDZ domain-containing proteins [7,25] Regardless of whether E6AP is involved, Since p53 and MAGI-3 represent distinct...
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Báo cáo hóa học: "Research Article Comparison of Channel Estimation Protocols for Coherent AF Relaying Networks in the Presence of Additive Noise and LO Phase Noise Stefan Berger and Armin Wittneben" pptx
... this point is a function of the destination index m Increasing the NSD while keeping NR constant is therefore in favor of protocol A1 If the number of relays increases, the relation between l and ... complex baseband, sample them, and store the samples until the end of the first phase In the second phase, they retransmit scaled and rotated version of their received samples to the destinations ... is defined in (7) In order to compute the MSE given in (8) by averaging over the perturbing noise (additive estimation noise and phase noise), the dependence of the gain factors on the channel...
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