The Experts below are selected from a list of 14418 Experts worldwide ranked by ideXlab platform

Dharma P Agrawal - One of the best experts on this subject based on the ideXlab platform.

  • Coverage and Connectivity for Regular Deployments
    Embedded Sensor Systems, 2017
    Co-Authors: Dharma P Agrawal
    Abstract:

    Up till now, we have considered WSN to have a large number of randomly deployed SNs, primarily useful for defense applications and natural disasters. But, they can be utilized using a Regular Topology pattern if the area is accessible and SNs can be placed at any point within the area.

  • t hex true hexagonal Regular Topology formation in large scale wireless sensor networks
    Mobile Adhoc and Sensor Systems, 2012
    Co-Authors: Sanshit Sharma, Vaibhav Pandit, Dharma P Agrawal
    Abstract:

    Wireless Sensor Network (WSNs) have seen a steady rise in their popularity and have become an integral part of a large spectrum of applications. Many of these applications advocate the use of large scale WSNs with dense deployments to provide comprehensive sensing coverage. The formation of clusters or overlay networks has been observed to improve the performance of such large scale networks. Furthermore, Regular topologies offer many advantages when dealing with networks of this size. Current schemes focus on creating logical or semi-logical Regular overlay networks only. In this paper, we present T-Hex, a distributed true hexagonal overlay network formation scheme for large scale networks, where all the nodes chosen to be a part of the overlay network strictly follow the hexagonal Topology. We evaluate T-hex by simulating it on a densely deployed WSN, and demonstrate its overlay formation and self-healing capabilities.

  • MASS Workshops - T-Hex: true hexagonal Regular Topology formation in large scale wireless sensor networks
    2012 IEEE 9th International Conference on Mobile Ad-Hoc and Sensor Systems (MASS 2012), 2012
    Co-Authors: Sanshit Sharma, Vaibhav Pandit, Dharma P Agrawal
    Abstract:

    Wireless Sensor Network (WSNs) have seen a steady rise in their popularity and have become an integral part of a large spectrum of applications. Many of these applications advocate the use of large scale WSNs with dense deployments to provide comprehensive sensing coverage. The formation of clusters or overlay networks has been observed to improve the performance of such large scale networks. Furthermore, Regular topologies offer many advantages when dealing with networks of this size. Current schemes focus on creating logical or semi-logical Regular overlay networks only. In this paper, we present T-Hex, a distributed true hexagonal overlay network formation scheme for large scale networks, where all the nodes chosen to be a part of the overlay network strictly follow the hexagonal Topology. We evaluate T-hex by simulating it on a densely deployed WSN, and demonstrate its overlay formation and self-healing capabilities.

Brunilde Sanso - One of the best experts on this subject based on the ideXlab platform.

  • design and dimensioning of a novel composite star wdm network with tdm channel partitioning
    Broadband Communications Networks and Systems, 2006
    Co-Authors: Stefano Secci, Brunilde Sanso
    Abstract:

    This paper presents the design and dimensioning optimization of a novel optical network structure, called the Petaweb, having a total capacity of several Pb/s (1015 bit/s). Its Topology is a superimposition of stars that drastically eases signaling and switching operations. Firstly, we deal with the network model, focusing on the insertion of the time-sharing of the optical channel in network components and in lightpath provisioning. The design problem is jointly a network dimensioning and an assignment problem; we propose for the dimensioning an integer linear programming formulation and a linear resolution algorithm for the assignment. We also propose the use of a quasi-Regular Topology extracted from the optimized Regular Topology to reduce costs and improve the network utilization.

  • BROADNETS - Design and Dimensioning of a Novel composite-star WDM Network with TDM Channel Partitioning
    2006 3rd International Conference on Broadband Communications Networks and Systems, 2006
    Co-Authors: Stefano Secci, Brunilde Sanso
    Abstract:

    This paper presents the design and dimensioning optimization of a novel optical network structure, called the Petaweb, having a total capacity of several Pb/s (1015 bit/s). Its Topology is a superimposition of stars that drastically eases signaling and switching operations. Firstly, we deal with the network model, focusing on the insertion of the time-sharing of the optical channel in network components and in lightpath provisioning. The design problem is jointly a network dimensioning and an assignment problem; we propose for the dimensioning an integer linear programming formulation and a linear resolution algorithm for the assignment. We also propose the use of a quasi-Regular Topology extracted from the optimized Regular Topology to reduce costs and improve the network utilization.

Martin Collier - One of the best experts on this subject based on the ideXlab platform.

  • a reconfigurable Regular Topology cluster datacenter network using commodity optical switches
    Future Generation Computer Systems, 2014
    Co-Authors: Diego Lugones, Kostas Katrinis, Georgios Theodoropoulos, Martin Collier
    Abstract:

    Hybrid optical/electrical interconnects using commercial optical circuit switches have been previously proposed as an attractive alternative to fully-connected electronically-switched networks. Among other advantages, such a design offers increased port density, bandwidth/port, cabling and energy efficiency, compared to conventional packet-switched counterparts. Recent proposals for such system designs have looked at small and/or medium scale networks employing hybrid interconnects. In our previous work, we presented a hybrid optical/electrical interconnect architecture targeting large-scale deployments in high-performance computing and datacenter environments. To reduce complexity, our architecture employs a Regular shuffle network Topology that allows for simple management and cabling. Thanks to using a single-stage core interconnect and multiple optical planes, our design can be both incrementally scaled up (in capacity) and scaled out (in the number of racks) without requiring major re-cabling and network re-configuration. In this paper, we extend the fundamentals of our existing work towards quantifying and understanding the performance of these type of systems against more diverse workload communication patterns and system design parameters. In this context, we evaluate-among other characteristics-the overhead of the reconfiguration (decomposition and routing) scheme proposed and extend our simulations to highly adversarial flow generation rate/duration values that challenge the reconfiguration latency of the system. We present an optical/electrical interconnect for large-scale Clusters/Datacenters.The system uses reconfigurable optical planes to optimize network communications.Low-cost electronic planes bypass traffic during the optical plane reconfiguration.A DeBruijn-based Topology ensures good tradeoff between radix and latency at scale.Performance approaches a fully connected network for stable traffic at lower cost.

  • A reconfigurable, Regular-Topology cluster/datacenter network using commodity optical switches
    Future Generation Computer Systems, 2014
    Co-Authors: Diego Lugones, Kostas Katrinis, Georgios Theodoropoulos, Martin Collier
    Abstract:

    Hybrid optical/electrical interconnects using commercial optical circuit switches have been previously proposed as an attractive alternative to fully-connected electronically-switched networks. Among other advantages, such a design offers increased port density, bandwidth/port, cabling and energy efficiency, compared to conventional packet-switched counterparts. Recent proposals for such system designs have looked at small and/or medium scale networks employing hybrid interconnects. In our previous work, we presented a hybrid optical/electrical interconnect architecture targeting large-scale deployments in high-performance computing and datacenter environments. To reduce complexity, our architecture employs a Regular shuffle network Topology that allows for simple management and cabling. Thanks to using a single-stage core interconnect and multiple optical planes, our design can be both incrementally scaled up (in capacity) and scaled out (in the number of racks) without requiring major re-cabling and network re-configuration. In this paper, we extend the fundamentals of our existing work towards quantifying and understanding the performance of these type of systems against more diverse workload communication patterns and system design parameters. In this context, we evaluate-among other characteristics-the overhead of the reconfiguration (decomposition and routing) scheme proposed and extend our simulations to highly adversarial flow generation rate/duration values that challenge the reconfiguration latency of the system. We present an optical/electrical interconnect for large-scale Clusters/Datacenters.The system uses reconfigurable optical planes to optimize network communications.Low-cost electronic planes bypass traffic during the optical plane reconfiguration.A DeBruijn-based Topology ensures good tradeoff between radix and latency at scale.Performance approaches a fully connected network for stable traffic at lower cost.

Matthew Roughan - One of the best experts on this subject based on the ideXlab platform.

  • PDCAT - Maximizing Networking Lifetime in Wireless Sensor Networks with Regular Topologies
    2008 Ninth International Conference on Parallel and Distributed Computing Applications and Technologies, 2008
    Co-Authors: Hui Tian, Hong Shen, Matthew Roughan
    Abstract:

    Energy-constraint is a crucial problem in wireless sensor networks (WSNs). Many sensor node (SN) placement schemes and routing protocols are proposed to address this problem. In this paper, we first present how to place SNs by use of a minimal number to maximize the coverage area when the communication radius of the SN is not less than the sensing radius, which results in the application of Regular Topology to WSNs deployment. With nodes placed at an equal distance and equipped with an equal power supply, we discuss the energy imbalance problem and then give the mathematical formulation for maximizing network lifetime in grid-based WSNs. The formulation shows the problem of maximizing network lifetime is a non-linear programming problem and NP-hard even in the 1-D case. We discuss several heuristic solutions and show that the halving shift data collection scheme is the best solution among them. We also generalize the maximizing network lifetime problem to the randomly-deployed WSNs which shows the significance of our mathematical formulation for this crucial problem.

Sanshit Sharma - One of the best experts on this subject based on the ideXlab platform.

  • t hex true hexagonal Regular Topology formation in large scale wireless sensor networks
    Mobile Adhoc and Sensor Systems, 2012
    Co-Authors: Sanshit Sharma, Vaibhav Pandit, Dharma P Agrawal
    Abstract:

    Wireless Sensor Network (WSNs) have seen a steady rise in their popularity and have become an integral part of a large spectrum of applications. Many of these applications advocate the use of large scale WSNs with dense deployments to provide comprehensive sensing coverage. The formation of clusters or overlay networks has been observed to improve the performance of such large scale networks. Furthermore, Regular topologies offer many advantages when dealing with networks of this size. Current schemes focus on creating logical or semi-logical Regular overlay networks only. In this paper, we present T-Hex, a distributed true hexagonal overlay network formation scheme for large scale networks, where all the nodes chosen to be a part of the overlay network strictly follow the hexagonal Topology. We evaluate T-hex by simulating it on a densely deployed WSN, and demonstrate its overlay formation and self-healing capabilities.

  • MASS Workshops - T-Hex: true hexagonal Regular Topology formation in large scale wireless sensor networks
    2012 IEEE 9th International Conference on Mobile Ad-Hoc and Sensor Systems (MASS 2012), 2012
    Co-Authors: Sanshit Sharma, Vaibhav Pandit, Dharma P Agrawal
    Abstract:

    Wireless Sensor Network (WSNs) have seen a steady rise in their popularity and have become an integral part of a large spectrum of applications. Many of these applications advocate the use of large scale WSNs with dense deployments to provide comprehensive sensing coverage. The formation of clusters or overlay networks has been observed to improve the performance of such large scale networks. Furthermore, Regular topologies offer many advantages when dealing with networks of this size. Current schemes focus on creating logical or semi-logical Regular overlay networks only. In this paper, we present T-Hex, a distributed true hexagonal overlay network formation scheme for large scale networks, where all the nodes chosen to be a part of the overlay network strictly follow the hexagonal Topology. We evaluate T-hex by simulating it on a densely deployed WSN, and demonstrate its overlay formation and self-healing capabilities.