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عنوان مقاله نویسنده (ها) مربوط به کنفرانس چکیده
High throughput Interference –Based routing in Multihop CDMA Cellular Networks Hadi Meshgi
Bahman Abolhasani
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
Efficient Sensor Selection Based on Spatial Correlation in Wireless Sensor Networks M. R. Zoghi
M. H. Kahaei
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
A Multi-Path Routing Protocol with Fault Tolerance in Mobile Ad hoc Networks M. Khazaei
R. Berangi
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
A Clustering Algorithm to Improve Routing Stability in Mobile Ad-hoc Networks Mehrnoosh Shakarami
Ali Movaghar
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). ... مشاهده کامل
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. عدم مشاهده کامل
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). ... مشاهده کامل
خرید مقاله
Improving Coverage in Mobile Sensor Networks Using Overlap Concept Bahareh J. Farahani
Mahmood Fathy
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
A Novel QoT-Aware Routing and Wavelength Assignment Algorithm in All-Optical Networks Amir Kakekhani
Akbar Ghaffar Pour Rahbar
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
Energy Aware Multi-path and Multi-SPEED Routing Protocol in Wireless Sensor Networks Sussan Sanati
Mohammad Hossein Yaghmaee
Asghar Beheshti
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
Using agent-oriented reasoning engine and SDC graph for optimizing semantic web services discovery Saeid Parsa
Kambiz Fakhr
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
Program Phase Detection in Heterogeneous Multi-Core Processors A. Z. Jooya
M. Analoui
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
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 ... مشاهده کامل
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. عدم مشاهده کامل
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 ... مشاهده کامل
خرید مقاله
۲٨٦۱ نتیجه (صفحه ۱٠۴ از ۲٨٧)
کنفرانس‌ها و رخدادها
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