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A packet based photonic label switching router for a multi-rate all-optical CDMA based GMPLS switch
, Article IEEE Journal of Selected Topics in Quantum Electronics ; Vol.13, No.5 , September/October , 2007 , PP. 1522-1530 ; Ibrahimi, M ; Salehi, J. A ; Sharif University Of Technology
Abstract
A novel packet-based photonic label switching router for a multirate all-optical switch using generalized multiprotocol label switching is proposed. The idea is based on using optical code-division multiple access (OCDMA) as multiplexing technique and treating OCDMA codes as labels. The system can coexist with current wavelength division multiplexing systems on the same infrastructure. The concept of switch fabric is introduced. Label processing and label swapping functionalities of the switch are discussed. In-depth analyses are made for spectrally phase-encoded OCDMA (SPE-OCDMA) due to its capabilities of supporting high data rates, large code cardinality, and its secure transmission....
Impact of channel estimation errors and power allocation on analog network coding and routing in two-way relaying [electronic resource]
, Article IEEE Transaction on Vehicular Technology ; Vol. 61, Issue 7, pp. 3223 - 3239, 2012 ; Sadeghi, P ; Hucher, Ch ; Pakravan, Mohammad R ; Sharif University of Technology
Abstract
In this paper, we study two important transmission strategies in full-duplex two-way relaying in the presence of channel estimation errors. In analog network coding (ANC), the relay transmits the combined signals that were received from both sources, with the aim of achieving better spectral efficiency. However, due to imperfect channel-state information (CSI), sources cannot perfectly cancel their own data in the relayed signal. We derive an achievable information rate for ANC in imperfect-CSI conditions and show how the ANC performance can significantly be degraded as a result. Moreover, we derive cut-set bounds with channel estimation errors for traditional routing (TR), in which time...
Efficient parallel routing algorithms for cartesian and composition networks
, Article 13th International Computer Society of Iran Computer Conference on Advances in Computer Science and Engineering, CSICC 2008, Kish Island, 9 March 2008 through 11 March 2008 ; Volume 6 CCIS , 2008 , Pages 299-307 ; 18650929 (ISSN); 3540899847 (ISBN); 9783540899846 (ISBN) ; Bakhshi, S ; Sarbazi Azad, H ; Sharif University of Technology
2008
Abstract
The Cartesian and Composition products are two well known graph products, also applied to interconnection networks area. The Cartesian and Composition network products possess great characteristics of fault resilience according to their high connectivity. In this paper, we study the existence and construction of parallel routing paths in these two well-known product networks. To prove the existence of certain number of parallel paths in these product networks, we need to compute their connectivity. By assuming the availability of certain number of faulty nodes, we propose some new shortest-path parallel routing algorithms. These algorithms can be used both in faulty networks and to route...
Utility constrained energy minimization in aloha networks
, Article 2007 4th Annual IEEE Consumer Communications and Networking Conference, CCNC 2007, Las Vegas, NV, 11 January 2007 through 13 January 2007 ; January , 2007 , Pages 665-669 ; 1424406668 (ISBN); 9781424406661 (ISBN) ; Hossein Khalaj, B ; Talebi, M. S ; Sharif University of Technology
2007
Abstract
In this paper we consider the issue of energy efficiency in random access networks and show that optimizing transmission probabilities of nodes can enhance network performance in terms of energy consumption and fairness. First, we propose a heuristic power control method that improves throughput, and then we model the Utility Constrained Energy Minimization (UCEM) problem in which the utility constraint takes into account single and multi node performance. UCEM is modeled as a convex optimization problem and Sequential Quadratic Programming (SQP) is used to find optimal transmission probabilities. Numerical results show that our method can achieve fairness, reduce energy consumption and...
A new scheme on recovery from failure in NICE overlay protocol
, Article 1st International Conference on Scalable Information Systems, InfoScale '06, Hong Kong, 30 May 2006 through 1 June 2006 ; Volume 152 , 2006 ; 1595934286 (ISBN); 9781595934284 (ISBN) ; Barghi, S ; Rabiee, H. R ; Ghanbari, M ; Sharif University of Technology
2006
Abstract
Overlay networks have been an active area of research for the past few years. The control overhead and the recovery from failure are the two important issues in the topology aware embedded overlay networks. In this research, we have introduced an enhanced version of the NICE protocol, called resilient NICE (R-NICE) that reduces the control overhead significantly. Furthermore, by saving the join path for an end host, the time and overhead of rejoining for isolated nodes have also been reduced. This will cause the clusters and consequently the overall network to become more stable and the effect of a node failure become localized. Our experimental results have confirmed the superior...
All-optical multi-service path switching in optical code switched GMPLS core networks [electronic resource]
, Article IEEE Journal of Lightwave Technology ; Vol. 27, No. 12, PP. 2001-2012, Jun. 2009 ; Salehi, J. A ; Sharif University Of Technology
Abstract
All-optical multi-service path switching in optical code switched GMPLS core networks
On pancyclicity properties of OTIS-mesh
, Article Information Processing Letters ; Vol. 111, issue. 8 , 2011 , p. 353-359 ; ISSN: 00200190 ; Hoseiny-Farahabady, M.R ; Movaghar, A ; Sarbazi-Azad, H ; Sharif University of Technology
Abstract
In optoelectronic OTIS multicomputer networks (also known as Swapped networks), electrical and optical interconnects are used for local and global communication, respectively. An interesting instance of the OTIS multicomputers is the OTIS-mesh. Pancyclicity is of great importance in the implementation of a variety of parallel algorithms in multicomputers. This paper addresses the Pancyclicity problem of OTIS-mesh. More precisely, we prove that if the factor graph G of an OTIS network is a 2-D or 3-D mesh with at least one even radix, OTIS-G can embed any cycle of length l, l?{4,6,7,8,9,...,|G|2}
On pancyclicity properties of OTIS-mesh
, Article Information Processing Letters ; Volume 111, Issue 8 , March , 2011 , Pages 353-359 ; 00200190 (ISSN) ; Hoseiny Farahabady, M. R ; Movaghar, A ; Sarbazi Azad, H ; Sharif University of Technology
2011
Abstract
In optoelectronic OTIS multicomputer networks (also known as Swapped networks), electrical and optical interconnects are used for local and global communication, respectively. An interesting instance of the OTIS multicomputers is the OTIS-mesh. Pancyclicity is of great importance in the implementation of a variety of parallel algorithms in multicomputers. This paper addresses the Pancyclicity problem of OTIS-mesh. More precisely, we prove that if the factor graph G of an OTIS network is a 2-D or 3-D mesh with at least one even radix, OTIS-G can embed any cycle of length l, l∈{4,6,7,8,9,...,|G|2}
Chromatic sets of power graphs and their application to resource placement in multicomputer networks
, Article Computers and Mathematics with Applications ; Volume 58, Issue 3 , 2009 , Pages 403-413 ; 08981221 (ISSN) ; Sarbazi Azad, H ; Akl, S. G ; Moinzadeh, P ; Sharif University of Technology
2009
Abstract
In this paper, using the chromatic properties of power graphs we propose a new approach for placing resources in symmetric networks. Our novel placement scheme guarantees a perfect placement when such a solution is feasible in the topology, while in general it answers the question of k-resource placement at a distance d where each non-resource node is able to access k resource nodes within at most d hops away. We define a quasi-perfect graph as a graph whose clique number and chromatic number are equal. We derive important properties of quasi-perfect graphs and use them to find a solution for the resource placement problem. We have also applied the proposed method to find a distant resource...
A new achievable rate and the capacity of some classes of multilevel relay network
, Article Eurasip Journal on Wireless Communications and Networking ; Volume 2008 , 2008 ; 16871472 (ISSN) ; Aref, M. R ; Sharif University of Technology
2008
Abstract
A new achievable rate based on a partial decoding scheme is proposed for the multilevel relay network. A novel application of regular encoding and backward decoding is presented to implement the proposed rate. In our scheme, the relays are arranged in feed-forward structure from the source to the destination. Each relay in the network decodes only part of the transmitted message by the previous relay. The proposed scheme differs from general parity forwarding scheme in which each relay selects some relays in the network but decodes all messages of the selected relays. It is also shown that in some cases higher rates can be achieved by the proposed scheme than previously known by Xie and...
Modified distributed mediation device for low power consumption in large scale sensor networks
, Article 2nd International Conference on Intelligent Sensing and Information Processing, ICISIP'05, Chennai, 4 January 2005 through 7 January 2005 ; Volume 2005 , 2005 , Pages 7-12 ; 0780388402 (ISBN); 9780780388406 (ISBN) ; Ghannad Rezaie, M ; Pakravan, H. R ; Sharif University of Technology
2005
Abstract
This paper proposes a new medium-access control (MAC) protocol designed for wireless sensor networks. A wireless sensor network is an array of large number of sensors interconnected by a multi-hop ad-hoc network. The fundamental objective for sensor network is low-power consumption while latency is usually less important. This characteristic of sensor network motivates different MAC laver design from the conventional wireless network to reduce power consumption. In this paper novel algorithm based on distributed mediation device (DMD) protocol has been introduced that utilized distributed node scheduling strategy to dramatically increase energy saving principally in intermediate devices...
Network survivability performance evaluation using fault trees
, Article Proceedings of the Third IASTED International Conference on Communications and Computer Networks, CCN 2005, Marina del Rey, CA, 24 October 2005 through 26 October 2005 ; 2005 , Pages 158-163 ; 0889865469 (ISBN); 9780889865464 (ISBN) ; Jahangir, A. H ; Jayasumana, A. P ; Sanadidi M. Y ; Sharif University of Technology
2005
Abstract
Network survivability refers to the ability of a network to maintain uninterrupted service regardless of the scale, magnitude, duration, and the type of failures. There is growing interest in attempts to quantify the network survivability in presence of various failures. We perceive that both performance and availability are integral components of survivability. Therefore, we propose a general composite model for survivability performance evaluation which is applicable to a wide range of networks. In this model, the excess loss due to failure (ELF) analysis is used to find the loss due to failure when the system is operating in gracefully degraded states. Fault tree method is used to model...
Optimum hello interval for a connected homogeneous topology in mobile wireless sensor networks
, Article Telecommunication Systems ; Vol. 52, issue. 4 , April , 2013 , pp. 2475-2488 ; Online ISSN: 1572-9451 ; Sarbazi-Azad, H ; Sharif University of Technology
Abstract
Topology of a mobile wireless sensor/ad hoc network is prone to link breakages due to node mobility which compels the periodic re-construction of the topology in so called ""hello"" intervals. The problem addressed in this paper is determining the maximum ""hello"" interval preserving the connectivity of a homogeneous topology with high probability. In order to study the optimum ""hello"" interval, statistical topology lifetime (STL) is formally defined as a value of ""hello"" interval that ensures statistical connectivity with a given threshold. Temporal properties of the topology are studied based on two phenomena; one concerning a connectivity phase transition with time and the other one...
Computing accurate performance bounds for best effort networks-on-chip
, Article IEEE Transactions on Computers ; Vol. 62, issue. 3, Article number 6109240 , 2013 , pp. 452-467 ; ISSN: 00189340 ; Murali, S ; Benini, L ; Angiolini, F ; De Micheli, G ; Sarbazi-Azad, H ; Sharif University of Technology
Abstract
Real-time (RT) communication support is a critical requirement for many complex embedded applications which are currently targeted to Network-on-chip (NoC) platforms. In this paper, we present novel methods to efficiently calculate worst case bandwidth and latency bounds for RT traffic streams on wormhole-switched NoCs with arbitrary topology. The proposed methods apply to best-effort NoC architectures, with no extra hardware dedicated to RT traffic support. By applying our methods to several realistic NoC designs, we show substantial improvements (more than 30 percent in bandwidth and 50 percent in latency, on average) in bound tightness with respect to existing approaches
Performance modeling of n-dimensional mesh networks
, Article Performance Evaluation ; Vol. 67, issue. 12 , 2010 , p. 1304-1323 ; ISSN: 01665316 ; Sarbazi-Azad, H ; Zarandi, H.-R ; Khodaie, E ; Hashemi-Najafabadi, H ; Ould-Khaoua, M ; Sharif University of Technology
Abstract
Mesh-based interconnection networks are the most popular inter-processor communication infrastructures used in current parallel supercomputers. Although many analytical models of n-D torus interconnection networks have been reported in the literature over the last decade, few analytical models have been proposed for the 2-D mesh case (and not for the general n-D mesh network) using inaccurate approximations as they have not fully incorporated the asymmetry effects of the mesh topology, in order to reduce the model complexity. There has not been reported, to the best of our knowledge, a performance model that can deal with the n-D mesh network. To fill this gap, in this paper, we propose the...
Direct approach in computing robust Nash strategies for generating companies in electricity markets
, Article International Journal of Electrical Power and Energy Systems ; Vol. 54, issue , 2014 , p. 442-453 ; Sadati, N ; Ranjbar, A. M ; Sharif University of Technology
Abstract
Supply function equilibrium (SFE) is often used to describe the behavior of generating companies in electricity markets. However, comprehensive analytical description of supply function models is rarely available in the literature. In this paper, using some analytical calculations, a novel direct approach is proposed to compute the Nash equilibrium (NE) of the supply function model under uniform marginal pricing mechanism. An explicit mathematical proof for its existence and uniqueness is also presented. The proposed methodology is then generalized to accommodate practical market constraints. In addition, a new concept of robust NE is introduced and calculated based on this approach....
A measurement framework for directed networks
, Article IEEE Journal on Selected Areas in Communications ; Volume 31, Issue 6 , June , 2013 , Pages 1007-1016 ; 07338716 (ISSN) ; Rabiee, H. R ; Sharif University of Technology
2013
Abstract
Partially-observed network data collected by link-tracing based sampling methods is often being studied to obtain the characteristics of a large complex network. However, little attention has been paid to sampling from directed networks such as WWW and Peer-to-Peer networks. In this paper, we propose a novel two-step (sampling/estimation) framework to measure nodal characteristics which can be defined by an average target function in an arbitrary directed network. To this end, we propose a personalized PageRank-based algorithm to visit and sample nodes. This algorithm only uses already visited nodes as local information without any prior knowledge about the latent structure of the network....
Computing accurate performance bounds for best effort networks-on-chip
, Article IEEE Transactions on Computers ; Volume 62, Issue 3 , 2013 , Pages 452-467 ; 00189340 (ISSN) ; Murali, S ; Benini, L ; Angiolini, F ; De Micheli, G ; Sarbazi Azad, H ; Sharif University of Technology
2013
Abstract
Real-time (RT) communication support is a critical requirement for many complex embedded applications which are currently targeted to Network-on-chip (NoC) platforms. In this paper, we present novel methods to efficiently calculate worst case bandwidth and latency bounds for RT traffic streams on wormhole-switched NoCs with arbitrary topology. The proposed methods apply to best-effort NoC architectures, with no extra hardware dedicated to RT traffic support. By applying our methods to several realistic NoC designs, we show substantial improvements (more than 30 percent in bandwidth and 50 percent in latency, on average) in bound tightness with respect to existing approaches
A novel technique to control the traffic of wireless ad-hoc network by fuzzy systems and prediction with neural network
, Article Proceedings - CIMSim 2011: 3rd International Conference on Computational Intelligence, Modelling and Simulation, 20 September 2011 through 22 September 2011, Langkawi ; 2011 , Pages 18-21 ; 9780769545622 (ISBN) ; Manzuri, M.T ; Sharif University of Technology
Abstract
Wireless Ad-hoc Networks have been proposed for variety of applications. In this paper our goal is to find crisis points in the roads, such as accident locations, and asphalt-destruction points, which may cause traffics along the roads. The applied method for traffic prediction is based on back propagation algorithm. In this paper the length of packets are assumed to be constant. Along the road the traffic is modeled by a Poisson Process. With this model we can produce packets. The number of packets which are sending from a typical node to the other nodes is controlled by a fuzzy system. By appropriate training of a neural network, we have shown that, having the traffic packets at time (t)...
A model for traffic prediction in wireless ad-hoc networks
, Article Communications in Computer and Information Science ; Volume 241 CCIS , 2011 , Pages 328-335 ; 18650929 (ISSN) ; 9783642273360 (ISBN) ; Manzuri, M. T ; Latifi, N ; Sharif University of Technology
Abstract
In recent years, Wireless Ad-hoc networks have been considered as one of the most important technologies. The application domains of Wireless Ad-hoc Networks gain more and more importance in many areas. One of them is controlling and management the packet traffic. In this paper our goal is controlling the performance of every sections of pipeline of the factory by checking network periodically. Along the factory the traffic is modeled with a Poisson process. We present, with obtaining traffic packets at time (t) for each node in Wireless Ad-hoc Network, we can completely train a Neural Network and successfully predict the traffic at time (t+1) for each node. By this way we can recognize the...