ICGST-CNIR, Volume 9, Issue (II), December 2009
Editors: Prof. Dr.
& Ashraf Aboshosha
| @ARTICLE |
{P1140920736, |
| AUTHOR = |
{Mahmoud
Abaza and Daryl Allenby}, |
| TITLE = |
{VIRTUAL
GREEN COMPUTING - Assessment of the
potential for virtual computing environments
to supply a responsive and environmentally
responsible alternative client computing
environment}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{1--9}, |
| ABSTRACT= |
{Through the course of
this paper two important and recently prominent ideas in
computing science are assessed in terms of their
combined potential to provide responsive and
environmentally responsible alternatives to traditional
desktop computing deployments. The ideas of
virtualization and green computing are combined to
develop a production model for virtual desktop
environments. The study is empirical, as it collects
real data from instrumented power circuits and benchmark
data at the hypervisor to be used in calculations. The
model developed is comprehensive, as it ensures all
equipment involved in provisioning both environment
types is included in data collection. Throughout the
study, conservative methods of calculation and
estimation are used to ensure that real world
implementations of the model developed are at least as
environmental and at least as responsive the results
indicated herein}, |
| NOTE= |
{Virtual computing, thin client, processing power,
Storage Area Networks, Hypervisor, green computing,
alternative client}
}
|
| @ARTICLE |
{P1140921757, |
| AUTHOR = |
{B. Elbhiri and R. Saadane and D.
Aboutajdine}, |
| TITLE = |
{Stochastic
Distributed Energy-Efficient Clustering
(SDEEC) for Heterogeneous Wireless Sensor
Networks}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{11--17}, |
| ABSTRACT= |
{Many new protocols are
specially designed for wireless sensor networks, where
the objectives is to save energy and extend the lifetime
of the network. The clustering Algorithm is a kind of
key technique which is largely used to answer these
purposes. In this paper, we present and evaluate a
Stochastic Distributed Energy-Efficient Clustering (SDEEC)
scheme for heterogeneous wireless sensor networks. This
protocol is based on dividing the network into dynamic
clusters. The cluster's nodes communicate with an
elected node called cluster head, and then this cluster
head aggregates and communicates the information to the
base station. SDEEC introduces a dynamic method where
the cluster head election probability is more efficient.
Moreover, It introduces a stochastic scheme detection to
prolong the network lifetime. Simulation results show
that our protocol performs better than the Stable
Election Protocol (SEP) and than the Distributed
Energy-Efficient Clustering (DEEC) in terms of network
lifetime. In the proposed protocol the first node death
occurs over 80% times longer than the first node death
in DEEC protocol and by about 110% than SEP}, |
| NOTE= |
{Heterogeneous environment, Energy, Consumption, DEEC,
Clustering, Wireless Sensor Networks}
}
|
| @ARTICLE |
{P1140936855, |
| AUTHOR = |
{Miraclin
Joyce Pamila J.C. and Thanushkodi K}, |
| TITLE = |
{FRAMEWORK
FOR TRANSACTION MANAGEMENT IN MOBILE
COMPUTING ENVIRONMENT}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{19--24}, |
| ABSTRACT= |
{Improvement in data
processing capability and increased data storage
capacity of mobile devices facilitate on-line internet
transaction processing possible from hand held mobile
devices. This enables multiple mobile devices to perform
online transaction processing independent of their
physical location. So simultaneous access is made to a
data item in the database server that involves
transaction execution. Such concurrent data access may
affect the consistency of the data and also may increase
network overhead. So a transaction management framework
is proposed that provides concurrency control and cache
management to reduce network overhead and data access
delay. The framework also ensures implicit cache
invalidation with reduced downlink requirement,
increased transaction throughput, dependency
preservation and decreased response time with reduced
complexity in mobile devices. Performance analysis
ensures decreased response time and increased throughput
of the proposed framework}, |
| NOTE= |
{Concurrency control, Cache invalidation, Dependency
preservation, Transaction recovery, Transaction frame
work in mobile networks}
}
|
| @ARTICLE |
{P1140950101, |
| AUTHOR = |
{Rafamantanantsoa Fontaine and Patrice Laurencot and Alexandre Aussem}, |
| TITLE = |
{Mixed Neural and Feedback Controller for Apache Web Server}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{25--30}, |
| ABSTRACT= |
{Overload control mechanism is used to protect a web
server from excessive load during traffic peaks and
involves techniques of predictive control with limited
local information. Four main types of overload control
mechanism can be identified: load balancing, content
adaptation, scheduling and admission control. The
admission control mechanism rejects some requests
whenever the incoming traffic is too high and in this way,
it maintains an acceptable response time. This paper
presents a neural based feedback control approach to
keep the mean response time of an Apache web server
close to the service level specification. Implementing in a
real web server, we show that both neural and feedback
control leads better tracking of quality of service
specification than with feedback control only or neural
model based feed forward control only}, |
| NOTE= |
{Feedback control, feed forward control,
neural network controller, web server}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950102, |
| AUTHOR = |
{Rafamantanantsoa Fontaine and Patrice Laurencot and Alexandre Aussem}, |
| TITLE = |
{Performance Modelling and Analysis of a Web Server}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{31--35}, |
| ABSTRACT= |
{In recent years, the number of web service users has been
growing rapidly. These users want fast and easy access to
all documents available on the Internet. That is why, web
server performance is becoming important. Web server
performance is affected by three components: the client,
the network bandwidths and the server capacity himself.
This later depends considerably on both the web server
configuration and the operating system used. Because of
their performance and stability, Apache is often used
with FreeBSD to serve web pages. This paper show
results of the performance analysis of these systems.
Using the benchmarks tools « webstone » and « bsdsar »
we analyze the effect of different parameters on the web
server performance and the operating system resources
(CPU, memory, disks, and interruption). By applying the
MVA (Mean Value Analysis) equations, we also present
a simple queuing network model representing the server
architecture (processor, memory, and disk) which
reasonably represents the behavior of a saturated web
server}, |
| NOTE= |
{Performances analysis, queuing network,
modelization, web server}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950103, |
| AUTHOR = |
{K. Benachenhou, E. Sari, M. Hammadouche}, |
| TITLE = |
{Multipath mitigation in GPS/GALILEO receivers with different signal
processing techniques}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{39--46}, |
| ABSTRACT= |
{It is well known that multipath error is one of the major
error sources affecting the positional accuracy of Global
Positioning System (GPS). Multipath effect can be
reduced by several methods essentially by signal
processing techniques which can be realized at the
correlator level, by using new signals (BOC or MBOC)
or with adaptive techniques. The main motivation of this
paper is to provide these methods for assessing multipath
performance, first we implement each approach
separately than we propose to combine them, concern
adaptive techniques we choice an NLMS algorithm. The
obtained results are presented and analyzed through
multipath errors envelope}, |
| NOTE= |
{GPS, Galileo, multipath mitigation, NLMS,
DLL, error envelope}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950104, |
| AUTHOR = |
{Zied OUARDA and Slim CHAOUI}, |
| TITLE = |
{Performance analysis of the Interleaved Frequency Division Multiple Access
scheme in a Multiple Input Single Output system}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{47--52}, |
| ABSTRACT= |
{Multiple Input Single Output (MISO) is a smart antenna
technology that uses multiple transmitters and a single
receiver on a wireless device to improve the transmission
distance. MISO technology knows in addition a net
renewed interest and the number of studies on the subject
follows an almost exponential curve. On the other hand,
Interleaved frequency division multiple access (IFDMA)
is a new spread spectrum multiple access scheme and it’s
under consideration as a promising candidate for the 4G
wireless applications. In this paper, we tried to envisage
the result of the marriage of these two techniques in a
Raileigh channel in order to improve the performance,
minimize errors and optimize data speed in a wireless
transmission}, |
| NOTE= |
{IFDMA, equalization, MISO, Alamouti}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950105, |
| AUTHOR = |
{T. Bchini and N. Tabbane and E. Chaput and S. Tabbane and A-L. Beylot}, |
| TITLE = |
{Performance of Soft Handover – FBSS Compared to Hard Handover in Case of
High Speed in IEEE 802.16e for Multimedia Traffic}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{53--58}, |
| ABSTRACT= |
{This evaluation is intended to show through simulations,
the performance of FBSS Handover mechanism
compared to the Hard Handover mechanism in the case
of high speed mobility with mobile WIMAX for
multimedia traffic. The model we propose for the
evaluation is composed to a highway in rural area
between two cities and responsible of vehicles traveling
in both directions with relatively high speeds and variable
between 80 and 130 km/h. The passengers in vehicles are
equipped with IEEE 802.16e terminals and exchange
with other nodes VoIP and video traffics. The highway
with 75 km length is covered by four base stations (BS)
whose range is 10 Km radius, and every two BSs belong
to the same Access Service Network (ASN). So, we will
evaluate the QoS of this mobility model, using and
comparing the Handover: Fast Base Station Switching
(FBSS) mechanism with hard handover mechanism
during the passage of vehicles between WIMAX cells,
through the measures that we will obtain by simulations.
The simulations were conducted under the mobility
module NIST of the NS2.29 simulator}, |
| NOTE= |
{IEEE 802.16e, FBSS, Hard Handover, Highspeed,
L2 Handover, QoS, Soft Handover, video, VoIP}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950106, |
| AUTHOR = |
{G. Zaibi, N. Nasri and A. Kachouri and M. Samet}, |
| TITLE = |
{Survey Of Temperature Variation Effect On Underwater Acoustic Wireless
Transmission}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{59--64}, |
| ABSTRACT= |
{In acoustic channel it is known that low available
bandwidth, highly varying multipath, large propagation
delays, noise and physical channel properties variation, in
addition to the power consumption restrict the efficiency
of underwater wireless acoustic systems.
The physical characteristics of Mediterranean channel
such as depth, salinity and especially temperature
influence the acoustic signal attenuation, the SNR level,
error ratio and the signal bandwidth. It seems to be
crucial to introduce these parameters in the underwater
channel model of the underwater wireless communication
network.
The goal of this paper is to highlight the impact of the
temperature variation at shallow sea on the acoustic
signal attenuation and error ratio and explain the
relationship between temperature and SNR as well as the
optimal frequency of the transmitted signal}, |
| NOTE= |
{optimal frequency, SNR, temperature,
underwater acoustic channel}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950107, |
| AUTHOR = |
{C. JEBALI, F. YATIM and A. GHARSALLAH}, |
| TITLE = |
{Oscillator Devices with Weak Phase Noise In Electronics Systems RF}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{65--70}, |
| ABSTRACT= |
{In this paper, proposal comparative models for phase
noise reduction in circuits and system devices, and some
application note examines the main factors that affect
phase noise behavioural with simulation computing for an
efficient transmission signal. This study based in
application of different oscillator models, and the phase
noise generation sources. The semiconductor circuit and
their symmetric positioning, in showing their effects to
reduce phase noise are presented. Finally, a Hajimiri
hypothesis is described to note the importance of current
injection in Vander pole oscillator in the reduction of
phase noise}, |
| NOTE= |
{Oscillators, Resonators, Phase noise, Hajimiri
Technical, Van Der Pol, VCO}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950108, |
| AUTHOR = |
{K. Rouabah, Dj. Chikouche and A. Khalfa}, |
| TITLE = |
{Application of the BA-POC Scheme for Multipath Mitigation in GPS/Galileo
Receivers}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{71--76}, |
| ABSTRACT= |
{This paper presents a solution to enhance the Global
Navigation Satellite System (GNSS) positioning by
mitigating the multipath (MP) influence. In several
cases GNSS navigation such as Global Positioning
System (GPS) and Future Galileo needs a very high
accuracy in positioning. As MP is a major source of
inaccuracy, we propose to use the concept of Binary-
Asymmetric Phase-Only Correlation (BA–POC) in the
GNSS receivers in order to estimate LOS delay of
received signal. BA-POC was applied to the area of
ranging to help identifying the line of sight (LOS) in
MP-abundant environments. Using the aforementioned
scheme, the MP induced bias can be efficiently reduced.
The obtained results show that the proposed scheme
gives better performance over existing correlationbased
schemes. Thus, it results in a high accuracy in
GNSS positioning}, |
| NOTE= |
{GPS, Galileo, Multipath, Fading, DLL,
HRC, BOC, POC, BA-POC}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950109, |
| AUTHOR = |
{S. Ghnimi and A. Rajhi and A. Garssallah}, |
| TITLE = |
{Design of a Dual Band Antenna
Array For GSM/UMTS/WLAN Operations}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{77--85}, |
| ABSTRACT= |
{This paper describes low cost, easy manufacturing and
wideband two types of resonant antenna arrays for GSM,
UMTS, and WLAN system applications. The proposed
patch antenna arrays with rectangular aperture having a
thick substrate is used to increase the bandwidth of the
antenna. A theoretical approach based on the resonant
cavity and the transmission line concept is introduced
leading to multi resonant behavior of the S11 parameter
and this theoretical formulation was also validated by
using the momentum ADS simulation; the advanced
design system (ADS) is used for the simulation of the
two proposed antennas in the band of frequency between
50 Hz to 3.2 GHz, leading to three resonant frequencies
and showing a good impedance bandwidth performance
to cover the required bandwidth of the GSM (890–960
MHz), UMTS (1920–2170MHz) and WLAN (at
2.45GHz) bands.. Also an investigation on the optimum
position of the slot relatively to the feeding point has
been done and the simulation results of the electrical
characteristics and the radiation patterns show that the
antenna array 1 can be used for the second and third
generation of mobile communication systems}, |
| NOTE= |
{patch antenna arrays, multi-band , return loss,
radiation patterns, GSM, UMTS, and WLAN}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950110, |
| AUTHOR = |
{Rania Mokhtar and, Rashid Saeed and Sabira Khatun}, |
| TITLE = |
{Spectrum Sensing and Sharing for Cognitive Radio and Advanced Spectrum
Management}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{87--97}, |
| ABSTRACT= |
{In recent years, cognitive radios have been introduced as
a new paradigm for enabling much higher spectrum
utilization, providing more personal and reliable radio
services, reducing harmful interference, and facilitating
the interworking or convergence of different wireless
networks. In this chapter we study the intelligent open
spectrum sharing using cognitive radios. This includes
the discussion of the existing spectrum regulations and its
challenges for spectrum scarcity. The advanced spectrum
sharing and sensing is also discussed. In this context the
cooperative spectrum sensing has been proposed to
overcome the problem associated with the local sensing
e.g. the hidden node problem due to noise uncertainty,
fading, and shadowing. In this chapter we also present a
hard decision auto-correction reporting scheme that
directly correct the error in the reported bit, and further
minimizes the average number of the reporting bits by
allowing only the user with a detection information -
binary decision 1- to report its result. The sensing
performance is investigated and the numerical result
shows great decrease in reporting bit without affecting
the sensing performance}, |
| NOTE= |
{cognitive radio, spectrum, sensing, sharing}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950111, |
| AUTHOR = |
{H. KAANICHE and M. BOUAZIZ2 and L. KAMOUN2}, |
| TITLE = |
{Study and performance evaluation of the Congestion control
mechanisms for the Metro Ethernet networks}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{99--106}, |
| ABSTRACT= |
{In a few years, the data-processing network became an
essential resource for all the fields. Metro Ethernet is a
type of network that has several advantages such as
simplicity, the access to high band-width and the cost of
deployment. But, considering the importance of use of
this network, a main issue of the congestion appears,
which reduces its performances. Therefore, to ensure an
effective use of the available resources, the Metro
Ethernet networks must be controlled in a suitable way to
avoid the loss of the data and to maintain a good
performance. Thus, it is desirable to have a congestion
control mechanism to prevent the sources to adjust their
rates of transfer depending on the state of the network, and
to eliminate or reduce the loss of the data when it’s
possible.
Recently, several control mechanisms of congestion,
which follow the standard IEEE 802.1Qau, were
proposed such as: ECM, QCN and QECM mechanisms.
This paper presents a study and a performance evaluation
of these mechanisms following a series of scenarios
treated by the Omnet++ network simulator. Then, we
analyze and compare the results found in order to deduce
the best control mechanism of congestion for the Metro
Ethernet networks}, |
| NOTE= |
{Metro Ethernet, congestion, control of
congestion, ECM, QCN, QECM, IEEE 802.1 Qau, Omnet}
}
|
(Status: Accepted)
| @ARTICLE |
{P1140950112, |
| AUTHOR = |
{Jacques ROTURIER}, |
| TITLE = |
{Internet versus Sustainable Players: A “No more ExaJoules” Commitment}, |
| JOURNAL = |
{ICGST
International Journal on Computer
Network and Internet Research,
CNIR}, |
| YEAR = |
{2009}, |
| MONTH= |
{December}, |
| VOLUME = |
{09}, |
| ISSUE = |
{II}, |
| PAGES= |
{107--114}, |
| ABSTRACT= |
{Coherently facing both the “Information Society” (IS)
and “Sustainable Development Society” (SDS), let me
(naively?) question the few scientists - out of 1 billion
users - present to-day: consciously concerned with the
continuous, apparently unlimited, growth of the Internet
electricity demand, is it affordable to get closed our eyes?}, |
| NOTE= |
{Internet versus Sustainable Players: A “No more ExaJoules” Commitment}
}
|
|
