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Paper Title |
Authors |
Conference |
Abstract |
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High throughput Interference –Based routing in Multihop CDMA Cellular Networks |
Hadi Meshgi
Bahman Abolhasani
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
the concept of multi-hop CDMA cellular networks
has received increasing attention now. It is a widely
accepted assumption that using multi-hopping in
cellular networks will increase the cellular throughput.
There are several advantages of ... more
the concept of multi-hop CDMA cellular networks
has received increasing attention now. It is a widely
accepted assumption that using multi-hopping in
cellular networks will increase the cellular throughput.
There are several advantages of MCN such as the
improved signal quality and higher coverage. Finding
an available relaying path is a critical prerequisite for
the success of the multi-hop cellular networks and has
a great impact on the network throughput. Most works
use signal strength, distance and power consumption
as routing criteria, but the effect of interference
specially intercell interference does not take into
account in routing algorithms. For this reason, in this
paper interference is calculated at any receiver during
the uplink, and a novel routing scheme based on
minimum interference and best link gain in each hop,
is proposed. Simulation results indicate that the
routing algorithm based on our proposed metric
results in higher throughput than the other metrics
under a certain constraint. less
the concept of multi-hop CDMA cellular networks
has received increasing attention now. It is a widely
accepted assumption that using multi-hopping in
cellular networks will increase the cellular throughput.
There are several advantages of ... more |
خرید مقاله
|
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Efficient Sensor Selection Based on Spatial Correlation in Wireless Sensor Networks |
M. R. Zoghi
M. H. Kahaei
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
In this paper, we study the selection of active
sensors in wireless sensor networks (WSN) subject to a
limited energy consumption and a given estimation
error. A cost function based on spatial correlation ... more
In this paper, we study the selection of active
sensors in wireless sensor networks (WSN) subject to a
limited energy consumption and a given estimation
error. A cost function based on spatial correlation is
derived for active sensor selection. Accordingly, a new
adaptive algorithm is proposed in which the number of
active sensors is adaptively determined and the best
topology of active set is selected based on the add one
sensor node at a time method. Simulation results show
that the distortion of the optimum defined cost function
is less than suboptimum one. Also, the performance of
the proposed algorithm for sensor selection in
computational burden is better than the other
algorithm. less
In this paper, we study the selection of active
sensors in wireless sensor networks (WSN) subject to a
limited energy consumption and a given estimation
error. A cost function based on spatial correlation ... more |
خرید مقاله
|
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A Multi-Path Routing Protocol with Fault Tolerance in Mobile Ad hoc Networks |
M. Khazaei
R. Berangi
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
In recent years many researches have focused on
ad-hoc networks, mainly because of their
independence to any specific structure. These
networks suffers from frequent and rapid topology
changes that cause many challenges in their ... more
In recent years many researches have focused on
ad-hoc networks, mainly because of their
independence to any specific structure. These
networks suffers from frequent and rapid topology
changes that cause many challenges in their routing.
Most of the routing protocols try to find a path
between source and destination nodes because any
path will expire, offer a short period, the path
reconstruction may cause the network inefficiency.
The proposed protocol build two paths between
source and destination and create backup paths
during the route reply process, route maintenance
process and local recovery process in order to
improve the data transfer and the fault tolerance. The
protocol performance is demonstrated by using the
simulation results obtain from the global mobile
simulation software(Glomosim). The experimental
results show that this protocol can decrease the
packet loss ratio rather than DSR and SMR and it is
useful for the applications that need a high level of
reliability. less
In recent years many researches have focused on
ad-hoc networks, mainly because of their
independence to any specific structure. These
networks suffers from frequent and rapid topology
changes that cause many challenges in their ... more |
خرید مقاله
|
|
A Clustering Algorithm to Improve Routing Stability in Mobile Ad-hoc Networks |
Mehrnoosh Shakarami
Ali Movaghar
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
The dynamic nature of mobile nodes in mobile adhoc
networks (MANETs), causes their association
and disassociation to and from clusters perturb the
stability of network and problem becomes worse if
nodes are clusterheads (CH). ... more
The dynamic nature of mobile nodes in mobile adhoc
networks (MANETs), causes their association
and disassociation to and from clusters perturb the
stability of network and problem becomes worse if
nodes are clusterheads (CH). Therefore cluster
maintenance schemes are needed to handle new
admissions and releases of node in the clusters.
In this paper, we introduce a novel cluster
maintenance algorithm which selects a new
clusterhead from a trusty area that is defined
previously based on some maintenance optimization
rules. The election process is done before the current
clusterhead leaves the cluster. So the routes which
include this clusterhead as a middle node are less
probable to break and will be more stable. Number of
nodes belonging to a cluster is restricted in the
proposed algorithm. In order to prevent of overusing
of clusterheads' battery power, the CH selection
process is invoked whenever the battery power of
current CH goes below some threshold. less
The dynamic nature of mobile nodes in mobile adhoc
networks (MANETs), causes their association
and disassociation to and from clusters perturb the
stability of network and problem becomes worse if
nodes are clusterheads (CH). ... more |
خرید مقاله
|
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Improving Coverage in Mobile Sensor Networks Using Overlap Concept |
Bahareh J. Farahani
Mahmood Fathy
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
In this paper we proposed a new approach for
improving distribution and coverage of mobile sensors
in a target filed. The goal is to deploy sensors such that
a target area is optimally ... more
In this paper we proposed a new approach for
improving distribution and coverage of mobile sensors
in a target filed. The goal is to deploy sensors such that
a target area is optimally covered by them. Proposed
method works based on number of neighbors. The
nodes which have the minimum overlaps with its
neighbors start to move away according to summation
of forces from their neighbors, boundaries and
obstacles. In order to achieve optimum coverage, the
effect of field corners is also calculated. For
evaluating the effectiveness of our proposed algorithm,
we compared the performance of our algorithm with
TRI and VEC which are well known algorithms in field
of mobile sensors coverage. Simulation results show
that our algorithm surely surpasses TRI and VEC in
coverage. less
In this paper we proposed a new approach for
improving distribution and coverage of mobile sensors
in a target filed. The goal is to deploy sensors such that
a target area is optimally ... more |
خرید مقاله
|
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A Novel QoT-Aware Routing and Wavelength Assignment Algorithm in All-Optical Networks |
Amir Kakekhani
Akbar Ghaffar Pour Rahbar
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
In WDM all-optical networks, physical impairments
degrade optical signal to noise ratio (OSNR). Therefore,
the quality of a lightpath must be checked during
connection setup. Since during a lightpath setup, it may
inject crosstalk ... more
In WDM all-optical networks, physical impairments
degrade optical signal to noise ratio (OSNR). Therefore,
the quality of a lightpath must be checked during
connection setup. Since during a lightpath setup, it may
inject crosstalk on all previously established lightpaths
with which it shares links or nodes, OSNR for those
lightpaths should be checked as well as the OSNR of the
tentative lightpath. If the number of hops for a lightpath
increases, the amount of OSNR degradation increases
due to crosstalk. Hence, longer paths are subject to
higher QoT degradation due to crosstalk. In this paper,
we enhance OSNR degradation for different lightpaths
with different hop numbers in such a way that OSNR
degradation for long-hop lightpaths becomes closer to
short-hop lightpaths, i.e., a fair OSNR degradation. We
provide a mechanism to estimate crosstalk risk at the
routing process by which we can find the nodes with
positive crosstalk risk. Then, rerouting procedure is used
to reduce the crosstalk risks of these nodes by migrating
some of lightpaths that pass through the nodes. less
In WDM all-optical networks, physical impairments
degrade optical signal to noise ratio (OSNR). Therefore,
the quality of a lightpath must be checked during
connection setup. Since during a lightpath setup, it may
inject crosstalk ... more |
خرید مقاله
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Energy Aware Multi-path and Multi-SPEED Routing Protocol in Wireless Sensor Networks |
Sussan Sanati
Mohammad Hossein Yaghmaee
Asghar Beheshti
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
Wireless sensor networks are limited in energy.
Any routing protocol used in wireless sensor networks
should take into consideration the time sensitive nature of
the traffic in such networks, along with the amount ... more
Wireless sensor networks are limited in energy.
Any routing protocol used in wireless sensor networks
should take into consideration the time sensitive nature of
the traffic in such networks, along with the amount of
energy left for each sensor.
In this paper we present an energy aware packet delivery
mechanism for probabilistic Quality of Service (QoS)
guarantee in wireless sensor networks. Each node takes
routing decisions based on geographic progress towards the
destination sink, required end-to-end total reaching
probability, delay at the candidate forwarding node and
residual energy. The simulation results demonstrate that the
proposed protocol effectively improves the energy usage
efficiency of the sensor nodes, maximizing the lifetime of the
entire sensor network, while keeping guaranteed QoS. less
Wireless sensor networks are limited in energy.
Any routing protocol used in wireless sensor networks
should take into consideration the time sensitive nature of
the traffic in such networks, along with the amount ... more |
خرید مقاله
|
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Using agent-oriented reasoning engine and SDC graph for optimizing semantic web services discovery |
Saeid Parsa
Kambiz Fakhr
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
The discovery of suitable web services for a given
task is one of the major operations in SOA architecture, and
researches are being done to automate this step. For the
large amount of ... more
The discovery of suitable web services for a given
task is one of the major operations in SOA architecture, and
researches are being done to automate this step. For the
large amount of available Web services that can be expected
in real-world settings, the computational costs of automated
discovery based on semantic matchmaking become
important.
To make a discovery engine a reliable software component,
we must aim at minimizing both the mean and the variance
of the duration of the discovery task. For this, we present an
extension for discovery engines in SWS environments that
exploit structural knowledge and previous discovery results
for reducing the search space of consequent discovery
operations. Our prototype implementation shows significant
improvements when applied to the Stanford SWS Challenge
scenario and dataset. less
The discovery of suitable web services for a given
task is one of the major operations in SOA architecture, and
researches are being done to automate this step. For the
large amount of ... more |
خرید مقاله
|
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Program Phase Detection in Heterogeneous Multi-Core Processors |
A. Z. Jooya
M. Analoui
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چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
In present study, in order to improve the
performance and reduce the amount of power which is
dissipated in heterogeneous multicore processors, the
ability of detecting the program execution phases is
investigated. The program’s ... more
In present study, in order to improve the
performance and reduce the amount of power which is
dissipated in heterogeneous multicore processors, the
ability of detecting the program execution phases is
investigated. The program’s execution intervals have
been classified in different phases based on their
throughput and the utilization of the cores. The results
of implementing the phase detection technique are
investigated on a single core processor and also on a
multi-core processor. To minimize the profiling
overhead, an algorithm for the dynamic adjustment of
the profiling intervals is presented. It is based on the
behavior of the program and reduces the profiling
overhead more than three fold. The results are
obtained from executing multiprocessor benchmarks
on a given processor. In order to show the program
phases clearly, throughput and utilization of execution
intervals are presented on a scatter plot. The results
are presented for both fixed and variable intervals. less
In present study, in order to improve the
performance and reduce the amount of power which is
dissipated in heterogeneous multicore processors, the
ability of detecting the program execution phases is
investigated. The program’s ... more |
خرید مقاله
|
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Dynamic Strength Scaling for Delay Fault Propagation in Nanometer Technologies |
Reza Javaheri
Reza Sedaghat
|
چهاردهمین کنفرانس بین‌المللی سالانه انجمن کامپیوتر ایران |
This paper proposes an algorithm for the detection
of resistive delay faults in deep submicron technology
using dynamic strength scaling, which is applicable for
45 nm and below. The approach uses an advanced
coding ... more
This paper proposes an algorithm for the detection
of resistive delay faults in deep submicron technology
using dynamic strength scaling, which is applicable for
45 nm and below. The approach uses an advanced
coding system to build logical functions that are
sensitive to strength and able to detect even the
slightest voltage changes in the circuit. Such changes
are caused by interconnection resistive behavior and
result in timing-related defects. less
This paper proposes an algorithm for the detection
of resistive delay faults in deep submicron technology
using dynamic strength scaling, which is applicable for
45 nm and below. The approach uses an advanced
coding ... more |
خرید مقاله
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