multiple access techniques in computer networks ppt
Báo cáo hóa học: " Enabling location-aware quality-controlled access in wireless networks" ppt
Ngày tải lên :
21/06/2014, 00:20
... unfairness
by reducing the chances of transmission for the sending
stations in the way of increasing the minimum conten-
tion window size. The downlink compensation access
(DCA) algorithm in [16] gives ... Analytical modeling of TCP clients in Wi-Fi hot
spot networks, in Proceedings of IFIP Networking (2004)
36. S Choi, K Park, C Kim, Performance impact of inter-layer dependency in
infrastructure ... services, intelligent traffic alerts,
tracking, pinpointing child’s location, and local map pro-
visioning have been dealt with much attention in the
community [2-4]. Noticeable point is that...
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báo cáo hóa học:" Multiple access communications in future-generation wireless networks" potx
Ngày tải lên :
21/06/2014, 17:20
... and
efficient wireless access in challenging interference scenarios, for example,
multiple networks deployed in the same geographical area and sharing a
common band.
In 1976, an ALOHA channel ... “Polarization Division Multiple Access With Polarization
Modulation for LOS Wireless Communications” by Bin Cao, Qin-Yu Zhang,
and Lin Jin discusses a potential multiple access and modulation ... algorithm increases only linearly
with the number of users. In this algorithm, the different CFOs from different
users destroy the orthogonality among training sequences and introduce
multiple access...
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Tài liệu Exploring Privacy Risks in Information Networks ppt
Ngày tải lên :
16/01/2014, 16:33
... privacy-enhancing
technologies.
Information networks serve as the context in which privacy is investigated.
Within information networks, the concepts of information ecosystems and con-
tamination are introduced. ... different online registers or databases con-
taining personal information may be combined by powerful search engines in
order to get an apprehension about groups of individuals. In effect, this informa-
tion ... and several startups joined in creat-
ing Internet products and services. By the beginning of 2000, the Internet was
supporting a great number of popular applications, including typical killer appli-
cations...
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Tài liệu 2.548 Mạng máy tính – K49 (Computer Networks) ppt
Ngày tải lên :
24/01/2014, 04:20
... liên kết (connection-
oriented)
Kết n
ối điểm - điểm (point-to-point) và kết nối đa điểm (point-to-multi-point,
multipoint-to-multipoint)
1.4. Mô hình tham chiếu và giao thức trên mạng
1.4.1. ... Learning bridge
3.2.3. Thuật toán cây spanning
3.3. Source routing bridge
3.3.1. Pure source routing bridge
− Nguyên tắc chung
− Thuật toán
3.3.2. SR-TB (Source routing to transparent bridging) ...
[5] Jim Kurose, Keith Ross, Computer Networking: A Top-Down Approach Featuring the
Internet, Addison-Wesley 2001
[6] J. Eberspaecher, Broadband Communication Networks, Lecture, Technical University...
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Tài liệu The OSI Model: Understanding the Seven Layers of Computer Networks ppt
Ngày tải lên :
24/01/2014, 09:20
... understanding the details of computer networking.
Since the discussion of networking often includes talk of
“extra layers”, this paper will address these unofficial
layers as well.
Finally
, ... Classrooms,
e-Learning, and On-site sessions, to meet your IT and management training needs.
About the Author
Paul Simoneau has over 37 years of experience in working with multiple aspects of computers ... founder and president of NeuroLink, Ltd., an international coaching and education com-
pany specializing in professional development. NeuroLink’
s client list includes Cisco, AT&T, Lucent,...
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Tài liệu Cisco AVVID Network Infrastructure: Implementing 802.1w and 802.1s in Campus Networks ppt
Ngày tải lên :
24/01/2014, 10:20
... transitions a link to forwarding only if it is a point-to-point link. A point-to-point link
is determined when the link is in full-duplex mode.
76736
MST
Region
CST
3-8
Cisco AVVID Network Infrastructure: ... Network Infrastructure: Implementing 802.1w and 802.1s in Campus Networks
956652
About this Guide
Obtaining Technical Assistance
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting ... Learning
• Forwarding
• Discarding
The 802.1D states disabled, blocking, and listening have been merged into a unique 802.1w discarding
state.
Note In the Cisco implementation, the name blocking...
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Báo cáo khoa học: "EXPERT SYSTEMS AND OTHER NEW TECHNIQUES IN MT SYSTEMS " ppt
Ngày tải lên :
08/03/2014, 18:20
... metho-
dology by incorporating advanced techniques from
software engineering, moving toward third-genera-
tion systems by incorporating expert systems, and
returning to interactive techniques for ... propose
an initial implementation. The expertise to be
incorporated in this system includes linguistic,
metalinguistic, and extralinguistic knowledge. The
system is constructed by combining a "closed" ...
taining and upgrading the lingware, even in an
admittedly limited second generation CAT system,
requires a good deal of expertise. Techniques are
now being developed to maintain the linguistic
knowledge...
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Molecular Biotechnology-Lession 3: Basic techniques in DNA technology ppt
Ngày tải lên :
23/03/2014, 22:20
... Denature DNA, 95
0
C, 30s-1min
- Annealing, 55-60
o
C, 1min
Step 3: Extension, 70-72
o
C, 30s-1min
Go to step 2, 32 cycles
Step 4: Holding, 4
o
C, 0s
Steps programmed in PCR
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Báo cáo khoa học: "PARALANGUAGE IN COMPUTER MEDIATED" ppt
Ngày tải lên :
24/03/2014, 01:21
... of paralinguistic
code structure in computer conferencing. Moreover, the
findings do not suggest that a clear code exists for
the community of users. Rather, the code appears to
be in a stage ... determining usage. The findings
serve more to define questions for subsequent study
than to provide answers about user variations.
In addition, It is clear that the characteristics of
the computer ... tonal and expressive informa-
tion. Second, it is not easy to communicate this
information. Users must work in computer conferencing
to communicate information about their feelings and
state of...
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Báo cáo hóa học: " A new and efficient adaptive scheduling packets for the uplink traffic in WiMAX networks" ppt
Ngày tải lên :
20/06/2014, 22:20
... SS (uplink traffic) and in the BS (downlink and
uplink traffic). However, in this study, it is being
addressed the scheduling packets for the uplink traffic
in the BS.
The uplink scheduling is ... environments, minimizing the average
delay according to the MCSs used in the PHY. This
algorithm also interacts with the polling mechanism,
adapting the polling interval, and guaranteeing the mini-
mal bandwidth ... is
less complex than the one described in [18].
In [19], it was defined an analytical technique for
obtaining an optimal polling interval. Using this polling
interval, the BS should poll the SSs...
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Báo cáo hóa học: "Research Article Particle Swarm Optimization for Adaptive Resource Allocation in Communication Networks" pptx
Ngày tải lên :
21/06/2014, 17:20
... particles
in the algorithm. The training process could be p erformed
manually by observing the behaviour of the particles in a
specific system or using artificial intelligence techniques such
as neural networks ... node
selection process in an ad hoc network with 50 nodes.
Both techniques are simulated and the gain of training
the particles is demonstrated in relation to nontrained
algorithm. In Table 2 we introduce ... channel gain in the RD
link are chosen using similar method to that just described.
However, the solution space will only contain the channel
gains profile of the RD link described as following:
S
=
h
RD
1
e
j∅
2
,
h
RD
2
e
j∅
2
,...
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Báo cáo hóa học: "Research Article A Decentralized Approach for Nonlinear Prediction of Time Series Data in Sensor Networks" pptx
Ngày tải lên :
21/06/2014, 17:20
... promising
subject for research.
References
[1] M. Rabbat and R. Nowak, “Distributed optimization in sensor
networks, ” in Proceedings of the 3rd International Symposium
on Information Processing in ... dynamic fields.
Online optimization of this criterion by adding or removing
kernel functions from the dictionary also seems interesting.
Finally, in a broader perspective, controlling the movement
of ... of the training set, making them unsuitable
for online applications. Therefore, it was essential to first
propose a mechanism for controlling the increase in the
model order as new input data...
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báo cáo hóa học:" Decentralized estimation over orthogonal multiple- access fading channels in wireless sensor networks-- optimal and suboptimal estimators" ppt
Ngày tải lên :
20/06/2014, 04:20
... communication SNR levels. It
is interesting to see that using more training symbols does not improve the performance of the MLE as
expected, because inserting training symbols will reduce the energy ... first inequality in (76) and t he second inequality in (77) are satisfied. From the condition
f(θ)(θ − Φ) < 0, it is not hard to find that the second inequality in (76) and the first inequality in ... Furthermore, since the estimation quality of the first stage is available, we use BLUE to obtain
ˆ
θ for exploiting the quality information instead of using the MLE in the M-step as in the standard...
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