denial of service attacks in wireless networks the case of jammers abstract
ON APPLICATION-PERCEIVED QUALITY OF SERVICE IN WIRELESS NETWORKS
... research in the field application-perceived Quality of Service The work was done at the School of Engineering at Blekinge Institute of Technology (BTH) in the context of the Personal Information for Intelligent ... ≥ min) The time scale is also of interest in the context of demand modeling and provisioning For instance, [27] is using a ΔT = interval when measuring the point-to-point traffic matrix in the ... Quality of Service from the viewpoints of the application and user The focus of the thesis is on the in uence of the network on the applicationperceived Quality of Service and thus the user perceived...
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Báo cáo hóa học: " Research Article Centroid Localization of Uncooperative Nodes in Wireless Networks Using a Relative Span Weighting Method" pot
... solution The original incarnation of CL is described by Bulusu et al [17] and localizes the transmitting source of a message to the (x, y) coordinates obtained from averaging the coordinates of all ... space, or in closed-form, where the coordinates of a single point are determined Open-form solutions may be constructed as the intersection of rings, or annuli, around the receivers of a particular ... values In addition, rather than increasing the weighting factor exponent by one for each observation in time, we correlate the exponent with the relative position of each receiver’s RSS value within...
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Design and analysis of optimal resource allocation policies in wireless networks
... Transmission scheduling From a single user’s point of view, transmission scheduling determines the times for transmitting the head of line packet in the (sorted) buffer Transmission scheduling can be used ... apply a modelling technique in the case when a single user has to consider its self-optimization in the presence of other users (interference) The characteristic and the property of the optimal ... packet At the beginning of a frame, the sender first decides to transmit or not based on the observation of the number of residual file packets in the buffer and also the delay constraint Furthermore,...
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Cooperative communications in wireless networks novel approaches in the mac layer
... promising method for improving the performance of wireless networks The diversity gain provided by the cooperation among the wireless nodes can be utilized to mitigate the effects of fading in the ... in AF scheme, the relay node sends a magnified copy of the received signal from S without determining the actual contents of the signal In contrast, in the DF method the relay first decodes the ... used in the relay nodes for achieving diversity gain Other approaches are proposed for exploiting the cooperation diversity in the MAC layer as well The main challenge in MAC is to find the best...
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Tài liệu The importance of land tenure in African countries: The case of Uganda doc
... xuất lương thực (như quay vòng chất dinh dưỡng, ngưng kết chất nitơ, quản lý sâu bệnh thống v.v.), đặc biệt sử dụng tốt tri thức kỹ người nông dân tăng cường tự tin khả họ Định nghĩa Smyth Dumanski ... lượng công việc kinh tế việc nhà tạo gánh nặng cho họ, (c) luật lệ phong tục không cho phép người phụ nữ tiếp cận tới đất đai, tín dụng, đầu vào, việc làm, giáo dục, thông tin hay y tế Sự khác ... tiếp cận lực khuyến khích học tập cá nhân xã hội Thay đổi kĩ thuật trình phức tạp với yếu tố sinh-lý kinh tế - xã hội Đó không việc giới thiệu khía cạnh kĩ thuật mà kết suy nghĩ hoạt động đài phát...
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Tài liệu Implementing Service Quality in IP Networks doc
... charged of infringing copyright of the publishers and of the music artists Distributed versions of the service were developed, consisting of a central server containing pointers to the location of the ... of services There is a long body of experience of implementing services within the telecommunications industry The basic reason for this is that in the communications model of telephony the services ... satisfied The ITU-T provides a long list of Internet service types in [G.1010] In [Y.1541], the following summary classification for Internet services is given in Table 2.1: The following types of Internet...
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EFFICIENCY AND DISTRIBUTION IN CONTRACT FARMING: THE CASE OF INDIAN POULTRY GROWERS pdf
... role of insurance and credit in explaining the existence and success of contract farming arrangements This is undoubtedly the case in the instance of poultry farming as well In terms of value, the ... ABSTRACT This paper is an empirical analysis of the gains from contract farming in the case of poultry production in the state of Andhra Pradesh in India The paper finds that contract ... of these issues Neither of these papers, however, considers the gains to the processors from contracting THE POULTRY INDUSTRY IN ANDHRA PRADESH The poultry industry has seen rapid growth in India...
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Civil Society 2.0?: How the Internet Changes State-Society Relations in Authoritarian Regimes: The Case of Cuba potx
... Introduction Civil Society in the 1990s: The Quest for Associational AutonomyAlong with its Limits Enter the Internet: The Public Sphere in Transnational Times Asserting Citizenship: The ... Public Sphere in Transnational Times Asserting Citizenship: The Public Sphere and Civil Society in the Internet Era From Voice via Web to Civil Society Action? Conclusions Ă Ê ... Â Debating Cuban Exceptionalism, London/New York: Palgrave, 2007 (edited with Laurence Whitehead). hoffmann@giga-hamburg.de ÊÊ Đ
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802.11 wireless networks the definitive guide second edition
... Ethernet cable at a desk Developers can work in the library, in a conference room, in the parking lot, or even in the coffee house across the street As long as the wireless users remain within ... accelerating the development of secure wireless LAN solutions Chapter Overview of 802.11 Networks Before studying the details of anything, it often helps to get a general "lay of the land." A basic introduction ... Many of the features of the standard come into their own only when the network is congested, either with a lot of traffic or with a large number of wireless stations Networks are increasingly...
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qos in packet networks the springer international series in engineering and computer science
... is integrated, and, without the integration, is undefined If the integration interval a ~ b includes the integration of over this interval is 1; if lies outside of the integration interval, the ... a “head” in the coin-throwing wins the grand prize In this game, the random “event” of interest is “winning the grand prize.” This event would “occur,” if the trials produce the following outcomes: ... denote the set of all real numbers, i.e., the continuum, from to Since the real line is a continuum, discrete points are also included in the set Figure 2-1 illustrates the mapping from to x on the...
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Báo cáo hóa học: " Enabling location-aware quality-controlled access in wireless networks" pdf
... mitigates the unfairness by reducing the chances of transmission for the sending stations in the way of increasing the minimum contention window size The downlink compensation access (DCA) algorithm in ... weight of in the interval of [40s, 80s], and the weight returns to after this interval; • Region-2 starts to have the weight of in the interval of [80s, 120s], and it returns to at the instant of 120s ... - The scenario for generating wireless link errors is the same one as used in the Section 6.2.1; in other words, wireless link errors appear in the period of [30s,70s] Figure 11b presents the...
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Báo cáo hóa học: " Minimum-length scheduling with rate control in wireless networks: a shortest path approach" docx
... simplification relates the minimum-length scheduling problem to the problem of obtaining a maximal matching in a non-bipartite graph [11] However, due to the broadcast nature of the wireless medium ... increasing function of the SINR threshold (see e.g., [22]) This gives rise to the following trade-off: By increasing the transmission rate, the number of transmitters that can successfully satisfy the ... Time-varying networks In the previous section, we focused on time-invariant channels However, in reality, the wireless channel is time-varying, due to the effects of fading, node mobility, etc In this...
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Báo cáo hóa học: " Enabling location-aware quality-controlled access in wireless networks" ppt
... mitigates the unfairness by reducing the chances of transmission for the sending stations in the way of increasing the minimum contention window size The downlink compensation access (DCA) algorithm in ... weight of in the interval of [40s, 80s], and the weight returns to after this interval; • Region-2 starts to have the weight of in the interval of [80s, 120s], and it returns to at the instant of 120s ... - The scenario for generating wireless link errors is the same one as used in the Section 6.2.1; in other words, wireless link errors appear in the period of [30s,70s] Figure 11b presents the...
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Báo cáo hóa học: " Opportunistic scheduling policies for improved throughput guarantees in wireless networks" doc
... varying number of users and varying loads from the applications of these users For wireless networks, the varying quality of the radio channel will further add uncertainty to the size of the ... algorithm is independent of the duration and placement of the time-window TW We can intuitively say that the offline parameter increases the throughput fairness of the system, whereas the online parameters ... value of Si by using efficient link adaptation and (close-to-)capacity-achieving codes Assuming Rayleigh faded channel gains, and denoting by pgi (g) the PDF of the CNR of user i, the PDF for the...
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báo cáo hóa học:" Research Article Quality-Aware SCTP in Wireless Networks" pdf
... estimate the changing value of the congestion window size We set the ICE measurement as periodic in the experiment The original heartbeat mechanism was applied for the remainder of the time to ... can distinguish different levels of a timed out packet, which solves the defect of the original SCTP’s single count as shown in Figure The proposed method counts the number of timeouts in a large ... also increases the cost by power of two to reflect different levels of timeout Therefore, the path reaches the inactive threshold quickly when a long-term error occurs on the path, as in the original...
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Báo cáo hóa học: "Research Article Cross-Layer Explicit Link Status Notification to Improve TCP Performance in Wireless Networks" potx
... that R is below 5% of r in the considered range of p Knowing that the bandwidth of wired links is usually larger than that of the wireless link, the bandwidth overhead of the ERSN and ELN messages ... number of backlogged segments N in the network It updates a three-state machine based on the changes of N Within the state machine, an increase of N during two consecutive intervals leads to the ... that the sending rate of TCP senders is not clamped by the receivers’ dynamics IEEE 802.11b [38] is used for the data link layer of a wireless link and the queue size of each wired link and the wireless...
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Báo cáo hóa học: " Research Article Multilayer Statistical Intrusion Detection in Wireless Networks" pptx
... detect the start of the attacks but show a relative large delay in detecting the ending points In other words, these algorithms seem to be sensitive to the location of the change points and to the ... essentially on the cardinality of every cluster and the local density of the elements within the feature space (2) The first point in every cluster is the center of the cluster meaning that an unclustered ... nonstationarity of the transient, a sliding window is considered Supposing that the number of samples in the transient signal is Ns and that w is the width of the sliding window, the number of feature...
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Báo cáo hóa học: " Editorial Cooperative Communications in Wireless Networks" ppt
... protocol for the two-hop relay channel, including the direct link, is considered In both cases, the goal is to design protocols to touch all points of the optimal diversity multiplexing tradeoff ... multiplexing The system uses a distributed implementation of an Alamouti code and discusses several interesting implementation issues Experimental results show gains in the order of dB to maintain ... coding techniques The authors elaborate the practical computational requirements and constraints of the cooperative techniques under evaluation, and they provide an accurate assessment of the...
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Báo cáo hóa học: " Research Article An 802.11k Compliant Framework for Cooperative Handoff in Wireless Networks" docx
... mechanisms in the network On the other hand, a lot of attention has been given in reducing the delays introduced during the association/handoff procedure The authors in [3] describe in detail the main ... is the basic part in the proposed mechanism presented in [16] while monitoring of the wireless communication links is the basic component of the proposed handoff mechanism in [17] In [18], the ... too Finally, in [23] there is an interesting study of different fast handoff mechanisms Our work in this paper eliminates the delays in the first part of the handoff procedures (scanning and probing...
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Báo cáo hóa học: " On Optimizing Compatible Security Policies in Wireless Networks" pdf
... from E and the rest of the arcs cannot have any cycle containing the special arc Lemma No cycle containing the arc from the object to its negation can be in E − S∗ Proof Suppose there exists ... Theorem The minimum feedback arc set for the graph G contains m + u edges, where u is the minimum number of unsatisfied clauses of the formula F Proof This theorem will be proved as a consequence of ... minimum Then we assign each variable xi in F a value depending on which set of edges with endpoints in {xi1 , xi2 } is included in the feedback arc set If all the edges from xi1 to xi2 are in...
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