Southeastern Symposium on System Theory, Mar 16, 2003
Skip to Main Content. IEEE.org | IEEE Xplore Digital Library | IEEE Standards Association | Spect... more Skip to Main Content. IEEE.org | IEEE Xplore Digital Library | IEEE Standards Association | Spectrum Online | More IEEE Sites. IEEE Xplore Digital Library. Search Term(s). Advanced Search | Preferences | Search Tips. ...
The 5th Conference on Information and Knowledge Technology, 2013
Content delivery networks have emerged to conquer massive requests problem in popular web service... more Content delivery networks have emerged to conquer massive requests problem in popular web services. One of the major issues in CDNs is the replica server placement problem. If the replica servers are geographically closer to the users, overall bandwidth consumption and the users' perceived latency will be reduced significantly. In this paper we have used IP geolocation services to achieve the users' locations in terms of latitude and longitude. Then we have clustered users according to their coordinates. Locating servers around the cluster centers, provides better performance of CDN.
IEEE Transactions on Device and Materials Reliability, 2014
The threshold voltage drifts induced by positive bias temperature instability (PBTI) and negative... more The threshold voltage drifts induced by positive bias temperature instability (PBTI) and negative bias temperature instability (NBTI) weaken nMOS and pMOS, respectively. These long-term aging threshold voltage drifts degrade SRAM cell stability, margin, and performance. This paper presents a low area overhead adaptive body bias (ABB) circuit that compensates BTI aging effects and also improves performance of an aged SRAM cell. The proposed circuit uses a control circuit and word line voltage to control the voltage applied to the body of 6T SRAM cell's transistors such that the BTI effect dependence of threshold voltage is reduced. In the worst case, the proposed ABB reduces the HOLD SNM degradation by 6.85%, the READ SNM degradation by 12.24%, the WRITE margin degradation by 2.16%, the READ delay by 28.68%, and the WRITE delay by 32.61% compared to the conventional SRAM cell at 108 s aging time.
AEU - International Journal of Electronics and Communications, 2015
Abstract Load balancing using clustering method is one of the most practical solutions, regarding... more Abstract Load balancing using clustering method is one of the most practical solutions, regarding to energy limitation in wireless sensor networks. Clustering protocols have to ensure reliability and connectivity in WSNs even in large scale environments. In this paper, a new decentralized hierarchical cluster-based routing algorithm for WSNs is proposed. The most of energy consumption occurs due to transmission of messages, such as data and control packets. In our new approach clustering and multi hop routing algorithms are performing at the same stage to decrease control packets. According to non-uniform energy consumption among nodes, clusters are formed in such a way that cluster heads have the most competency in forwarding task of intra-cluster and inter-cluster transmission tree. Energy consumption, adjustment degree and the exact distance that each data traverses to reach the base station are three main adjustment parameters for cluster heads election. Simulation results show that the proposed protocol leads to reduction of sensor nodes’ energy consumption and prolongs the network lifetime, significantly.
Network on chip (NoC) is a design space covered by the manifold combinations of network topology ... more Network on chip (NoC) is a design space covered by the manifold combinations of network topology options, routing algorithms, switch architectures, fault tolerant mechanisms and so on. In NoC structures, switches and links are important components on network layers and the effect of faults on links and switches in NoC leads to disturbance in internal communication and low reliability. The performance reduction of many-core NoC architectures depend strongly on the number of faulty switches. This bottleneck motivates us to propose a fault tolerant switch in which the ring roads help the switch to tolerate the faulty ports and also faulty cores. In the proposed scheme, switch ports are connected via redundant ring roads and so the connection with adjacent nodes is not limited to one port. Moreover, if the switch core is defected, the node stays active and cooperates in packet forwarding process. The main advantages of the proposed scheme are tolerating the permanent faults on core and ...
2012 Second International Conference on Digital Information and Communication Technology and it's Applications (DICTAP), 2012
Automatic detection of human cell is one of the most common investigation methods that may be use... more Automatic detection of human cell is one of the most common investigation methods that may be used as part of a computer aided medical decision making system. In this paper we present an efficient algorithm, based on the cluster analysis and the vector quantization techniques for human cell image detection. First, we perform the edge detection methods to specify the
2010 International Conference on Financial Theory and Engineering, 2010
Page 1. A New Symmetric Cryptography Algorithm to Secure E-Commerce Transactions Fahime Javdan Kh... more Page 1. A New Symmetric Cryptography Algorithm to Secure E-Commerce Transactions Fahime Javdan Kherad Department of Computer Engineering, IAU Dubai, UAE fahi_javdan@hotmail.com Hamid R. Naji Department of ...
2013 8th Iranian Conference on Machine Vision and Image Processing (MVIP), 2013
The life of a kind of whale is very interesting and it is in some cases close to human life. One ... more The life of a kind of whale is very interesting and it is in some cases close to human life. One of the interesting and fascinating things about whales is the way they hunt. In this article, an algorithm is presented with the inspiration of the way these whales hunt. This algorithm has a wide range of applications, In order to show the capabilities of this algorithm, one of the image processing techniques is optimized and implemented using the algorithm mentioned above. We got excellent results in the execution speed and image quality. The algorithm is implemented on Spartan 3s400 FPGA.
This paper presents an implementation model of a sensor fusion system using multiple autonomous a... more This paper presents an implementation model of a sensor fusion system using multiple autonomous agents that interact with each other with a collaborative behaviour and implemented in reconfigurable hardware (hardware agents). Such hardware implementations has the potential of greatly improving the performance of agent based sensor fusion operations when compared to equivalent software only implementations.
Southeastern Symposium on System Theory, Mar 16, 2003
Skip to Main Content. IEEE.org | IEEE Xplore Digital Library | IEEE Standards Association | Spect... more Skip to Main Content. IEEE.org | IEEE Xplore Digital Library | IEEE Standards Association | Spectrum Online | More IEEE Sites. IEEE Xplore Digital Library. Search Term(s). Advanced Search | Preferences | Search Tips. ...
The 5th Conference on Information and Knowledge Technology, 2013
Content delivery networks have emerged to conquer massive requests problem in popular web service... more Content delivery networks have emerged to conquer massive requests problem in popular web services. One of the major issues in CDNs is the replica server placement problem. If the replica servers are geographically closer to the users, overall bandwidth consumption and the users' perceived latency will be reduced significantly. In this paper we have used IP geolocation services to achieve the users' locations in terms of latitude and longitude. Then we have clustered users according to their coordinates. Locating servers around the cluster centers, provides better performance of CDN.
IEEE Transactions on Device and Materials Reliability, 2014
The threshold voltage drifts induced by positive bias temperature instability (PBTI) and negative... more The threshold voltage drifts induced by positive bias temperature instability (PBTI) and negative bias temperature instability (NBTI) weaken nMOS and pMOS, respectively. These long-term aging threshold voltage drifts degrade SRAM cell stability, margin, and performance. This paper presents a low area overhead adaptive body bias (ABB) circuit that compensates BTI aging effects and also improves performance of an aged SRAM cell. The proposed circuit uses a control circuit and word line voltage to control the voltage applied to the body of 6T SRAM cell's transistors such that the BTI effect dependence of threshold voltage is reduced. In the worst case, the proposed ABB reduces the HOLD SNM degradation by 6.85%, the READ SNM degradation by 12.24%, the WRITE margin degradation by 2.16%, the READ delay by 28.68%, and the WRITE delay by 32.61% compared to the conventional SRAM cell at 108 s aging time.
AEU - International Journal of Electronics and Communications, 2015
Abstract Load balancing using clustering method is one of the most practical solutions, regarding... more Abstract Load balancing using clustering method is one of the most practical solutions, regarding to energy limitation in wireless sensor networks. Clustering protocols have to ensure reliability and connectivity in WSNs even in large scale environments. In this paper, a new decentralized hierarchical cluster-based routing algorithm for WSNs is proposed. The most of energy consumption occurs due to transmission of messages, such as data and control packets. In our new approach clustering and multi hop routing algorithms are performing at the same stage to decrease control packets. According to non-uniform energy consumption among nodes, clusters are formed in such a way that cluster heads have the most competency in forwarding task of intra-cluster and inter-cluster transmission tree. Energy consumption, adjustment degree and the exact distance that each data traverses to reach the base station are three main adjustment parameters for cluster heads election. Simulation results show that the proposed protocol leads to reduction of sensor nodes’ energy consumption and prolongs the network lifetime, significantly.
Network on chip (NoC) is a design space covered by the manifold combinations of network topology ... more Network on chip (NoC) is a design space covered by the manifold combinations of network topology options, routing algorithms, switch architectures, fault tolerant mechanisms and so on. In NoC structures, switches and links are important components on network layers and the effect of faults on links and switches in NoC leads to disturbance in internal communication and low reliability. The performance reduction of many-core NoC architectures depend strongly on the number of faulty switches. This bottleneck motivates us to propose a fault tolerant switch in which the ring roads help the switch to tolerate the faulty ports and also faulty cores. In the proposed scheme, switch ports are connected via redundant ring roads and so the connection with adjacent nodes is not limited to one port. Moreover, if the switch core is defected, the node stays active and cooperates in packet forwarding process. The main advantages of the proposed scheme are tolerating the permanent faults on core and ...
2012 Second International Conference on Digital Information and Communication Technology and it's Applications (DICTAP), 2012
Automatic detection of human cell is one of the most common investigation methods that may be use... more Automatic detection of human cell is one of the most common investigation methods that may be used as part of a computer aided medical decision making system. In this paper we present an efficient algorithm, based on the cluster analysis and the vector quantization techniques for human cell image detection. First, we perform the edge detection methods to specify the
2010 International Conference on Financial Theory and Engineering, 2010
Page 1. A New Symmetric Cryptography Algorithm to Secure E-Commerce Transactions Fahime Javdan Kh... more Page 1. A New Symmetric Cryptography Algorithm to Secure E-Commerce Transactions Fahime Javdan Kherad Department of Computer Engineering, IAU Dubai, UAE fahi_javdan@hotmail.com Hamid R. Naji Department of ...
2013 8th Iranian Conference on Machine Vision and Image Processing (MVIP), 2013
The life of a kind of whale is very interesting and it is in some cases close to human life. One ... more The life of a kind of whale is very interesting and it is in some cases close to human life. One of the interesting and fascinating things about whales is the way they hunt. In this article, an algorithm is presented with the inspiration of the way these whales hunt. This algorithm has a wide range of applications, In order to show the capabilities of this algorithm, one of the image processing techniques is optimized and implemented using the algorithm mentioned above. We got excellent results in the execution speed and image quality. The algorithm is implemented on Spartan 3s400 FPGA.
This paper presents an implementation model of a sensor fusion system using multiple autonomous a... more This paper presents an implementation model of a sensor fusion system using multiple autonomous agents that interact with each other with a collaborative behaviour and implemented in reconfigurable hardware (hardware agents). Such hardware implementations has the potential of greatly improving the performance of agent based sensor fusion operations when compared to equivalent software only implementations.
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