mobility increases the capacity of ad hoc wireless networks pdf
the handbook of ad hoc wireless networks
... of them is eliminated by optimizing over the secondary metric (say delay), and so on. The mobility of mobile ad hoc networks adds another dimension of difficulty. Highly mobile hosts in the ad ... appear on the market. These technologies constitute the building blocks to construct small multi-hop ad hoc networks that extend the range of the ad hoc networks technologies over a few radio hops ... single-hop ad hoc wireless networks. The first part of this chapter presents the taxonomy of single-hop wireless technologies. Specifically, we introduce the concept of Body, Personal, and Local wireless...
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Báo cáo hóa học: " Research Article A Simulation Study: The Impact of Random and Realistic Mobility Models on the Performance of Bypass-AODV in Ad Hoc Wireless Networks" pdf
... K. Madsen, F. H. P. Fitzek, and R. Prasad, “Impact of different mobility models on connectivity probability of a wireless ad hoc network,” in Proceedings of the InternationalWorkshop on Wireless ... shows the values of all parametersused in the simulation. The following metrics are computedto evaluate the impact of each mobility model on the performance of the Bypass-AODV as well as the ... The routing overhead ratio is the ratio of the amountin bytes of control packets transmitted to the amountin bytes of data packets received. This measure isimportant to estimate the cost of...
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security & quality of service in ad hoc wireless networks
... an ad hoc network, as we shall see below. I address the general issue of routing inmobile ad hoc networks separately in the next section. The shared wireless environment of mobile ad hoc networks ... quality of service in ad hoc wireless networks. Starting with a review of the basic principles of ad hoc wireless networking,coverage progresses to the vulnerabilities these networks face and the ... toincorporate some of these schemes of wireless and wire-line networks. I devoteseveral chapters of this book to address incorporation of these schemes in ad hoc networks. In the following, I...
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báo cáo hóa học: " TCP NCE: A unified solution for non-congestion events to improve the performance of TCP over wireless networks" docx
... is the TCP’ s estimation of the end-to-endRTT delay at time tn,Ln the size of the data, tn-1 the arrival time of the previous ack, and tn the arrival time of nth packet at the receiver. The ... Recover, the sender sets the size of cwnd to the value of ssthreshand then goes to CA phase. On the other hand, if the current queue length is less than the threshold value at the time of receiving ... delay, the senderreceives add-dupacks and for each add- dupacks the sender sends new packet allowed by the value of cwnd.When the add-dupacks greater than or equal to the value of delay-thresh, the...
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Báo cáo hóa học: " Research Article Throughput Capacity of Ad Hoc Networks with Route Discovery" potx
... collect the pieces to obtain the main result of this paper: the scaling of the RDP limited throughput of a random ad hoc network. The next theorem covers the casewhere the RDP plays the role of the ... analyti-cal means. The subject of this paper is the effect of the route dis-covery process (RDP) on the throughput capacity of ad hoc networks. Previous results for the network capacity andthroughput, ... ex-pected value of Viwill be equal to half of the expected value of the number of nodes in the vertical strip formed by the “ column” of cells above and below the cell Ci.Theareaofthis strip...
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Báo cáo hóa học: " Research Article Channel MAC Protocol for Opportunistic Communication in Ad Hoc Wireless Networks'''' doc
... networks (WLANs).Although often used in practical implementations of mobile ad hoc networks, IEEE 802.11 presents several drawbacks in the context of ad hoc networks, one of them being its poorthroughput ... quantitatively estimated the degradation of the network throughput due to fading.Figure 1 shows the degradation of network throughputversus the probability of the channel being “bad” for different ... pair [2], independent of the number of nodes. However, the performance of ad hoc networks with MAC protocols such as IEEE 802.11 falls short of what is predicted by these theoretical models. This...
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Tài liệu Báo cáo khóa học: The C-terminal domain of Escherichia coli Hfq increases the stability of the hexamer ppt
... binding of the polyadenylated rpsO RNA.We have shown that the presence of the remainder of the acidic tail results in the thermodynamic stabilization of Hfqby 1.8 kcalặmol)1. A comparison of the ... destabilize the network of hydrogen bonds. The crystal structure of the first 71 amino acids of E. coliHfq indicates that the C-terminal domain is probablylocated at the top of the ring, because the ... another. The differencebetween the Hfqs results from the insertion of a fragment of variable length between the first 67 amino acids and the end of the acidic C-terminal domain. Determining the...
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Báo cáo khoa học: Limited mutagenesis increases the stability of human carboxypeptidase U (TAFIa) and demonstrates the importance of CPU stability over proCPU concentration in down-regulating fibrinolysis doc
... above.Determination of the half-life (T1/2) of CPU’sactivity The T1 ⁄ 2 of the activity of the best mutants secreted in the supernatant of the cells in both screens was thendetermined as follows: Activated ... interact favourably with the hydrophobic clus-ter made up of I316, F318, A337 and V341. Anothercontribution to the low stability of the WT proCPU is the close spatial proximity of the three His residues ... concentration of the inhibitor, A is locked to 0%, B to 100%, C is the IC50value and D is the slope of the curve. The IC50valueis the concentration x, where y ẳ 50%.Kmwas measured using the HPLC...
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Báo cáo khoa học: The pharmacological chaperone isofagomine increases the activity of the Gaucher disease L444P mutant form of b-glucosidase docx
... (Fig. 6), and support the long half-life of the enzyme. The inability to detectIFG in the brain of L444P GCase mice is most prob-ably a result of the dose of IFG tartrate administered(20 mgặkg)1ặday)1) ... andmeasurement of tissue enzyme activityMice were administered either IFG HCl or IFG tartrate indrinking water (ad libitum). The dosing solutions wereprepared on the basis of the daily water ... Journal compilation ê 2010 FEBS ages further evaluation of this molecule for the treat-ment of neuronopathic forms of Gaucher disease. The administration of IFG to L444P GCase micefor up to 24...
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Báo cáo toán học: " Performance of the audio signals transmission over wireless networks with the channel interleaving considerations" pot
... improves the quality of the received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction. Keywords: wireless networks; Bluetooth; fading ... devoted for studying the effects of the mobility of the wireless ad hoc network device (Vc) on the transmitted packets and the received audio signals. In this computer simulation, the v is 1 up ... show the variation of the Cr and the MSE of the received audio signals with the channel SNR, respectively. These figures reveal that the proposed chaotic interleaver improves the quality of the...
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Báo cáo hóa học: " The impact of spatial correlation on the statistical properties of the capacity of nakagami-m channels with MRC and EGC" pdf
... branches of an MRC system increases the variance as well as the LCR of the channel capacity, while the ADF of the channel capacity decreases. On the other hand, for the case of EGC, anincrease in the ... correlation decreases the mean channel capacity, whereas the ADF of the channel capacity increases. Moreover, an increase in the spatialcorrelation increases the LCR of the channel capacity atonly ... decreases the meanchannel capacity, while the ADF of the instantaneous channel capacity increases. The presented results are veryhelpful to optimize the design of the receiver of wireless communication...
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báo cáo hóa học:" Performance of the audio signals transmission over wireless networks with the channel interleaving " potx
... effects on the audio transmission performance This section is devoted for studying the effects of the mobility of the wireless ad hoc network device (Vc) on the transmitted packets and the received ... 16 gives the throughput variation with the different velocity of the mobility. So, these results indicate the mobility effects on the different metric of the perfromance evaluation. The previous ... improves the quality of the received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction. Keywords: wireless networks; Bluetooth; fading...
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Báo cáo hóa học: " Research Article A New Achievable Rate and the Capacity of Some Classes of Multilevel Relay Network" potx
... same frequency band are shown by the lineswith the same type. The capacity is given by the followingtheorem.Theorem 4 (see [5, Theorem]). The capacity of the relaychannel with orthogonal ... part of the message is directly decoded by the sink, while the otherparts are decoded by the next relay. In the next blocks, the sender and the relays cooperate with each other to remove the ... such that the relaydecodes part of the message transmitted in the previousblock and cooperates with the sender to transmit the decodedpart of the message to the sink in current block. The following...
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Báo cáo hóa học: " Research Article Cross-Layer Resource Scheduling for Video Traffic in the Downlink of OFDMA-Based Wireless 4G Networks" docx
... requirements of the scheduler in 4G networks into the original scheme. Insuch networks, the utilization of the resources and hence the performance of the network can be enhanced by makinguse of the ... the CDF plot of the normalizedthroughput given by (7) for 20 UTs per sector with an AF of 0.7. By normalizing the throughput, the performance of the cell edge users represented by the tail of ... Basedon these parameters, the second-level scheduler assignsresources to the selected users in an adaptive manner thatexploits the frequency selectivity of the OFDMA air inter-face. The modified...
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Báo cáo hóa học: " Research Article Development of Long-Range and High-Speed Wireless LAN for the Transmission of Telemedicine from Disaster Areas" pdf
... City,Nagano). The wireless networks made up of these wireless LANunits are shown in Figure 5. The wireless LAN in 2.4 GHz band should be operated inline of sight. The area between the main drill ... video images of victims being sent over the wireless LAN network from the devastated areas, administeraid to patients.In the case of Japan, paramedics are limited to the degreethat they can treat ... successfully in the main drill site area.These systems consisted of IEEE802.11b wireless LAN unitswe had already developed. The networks that we established and successfully oper-ated consisted of only...
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