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Network topology

About: Network topology is a research topic. Over the lifetime, 52259 publications have been published within this topic receiving 1006627 citations.


Papers
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Journal ArticleDOI
TL;DR: In larger networks that are not uniformly populated with nodes, terminode routing outperforms, existing location-based or MANET routing protocols, and in smaller networks; the performance is comparable to MANet routing protocols.
Abstract: Using location information to help routing is often proposed as a means to achieve scalability in large mobile ad hoc networks. However, location-based routing is difficult when there are holes in the network topology and nodes are mobile or frequently disconnected to save battery. Terminode routing, presented here, addresses these issues. It uses a combination of location-based routing (terminode remote routing, TRR), used when the destination is far, and link state-routing (terminode local routing, TLR), used when the destination is close. TRR uses anchored paths, a list of geographic points (not nodes) used as loose source routing information. Anchored paths are discovered and managed by sources, using one of two low overhead protocols: friend assisted path discovery and geographical map-based path discovery. Our simulation results show that terminode routing performs well in networks of various sizes. In smaller networks; the performance is comparable to MANET routing protocols. In larger networks that are not uniformly populated with nodes, terminode routing outperforms, existing location-based or MANET routing protocols.

263 citations

Proceedings ArticleDOI
M.D. Bellar1, T.S. Wu1, A. Tchamdjou, J. Mahdavi, Mehrdad Ehsani 
06 Oct 1996
TL;DR: In this paper, the authors classify the soft-switched DC-AC topologies in a simple and generic way, based on the location of the resonant network (load, inverter bridge, and bus), the characteristic of switching waveforms (zerovoltage switching or zero-current switching), and the type of resonance (series or parallel).
Abstract: Soft-switching techniques have recently been applied in the design of DC-AC power converters, in order to achieve better performance, higher efficiency and higher power density. A substantial number of new topologies for different applications has been developed, however the amount of work that has been done in this field is not widely known. This paper is an attempt to classify the soft-switched DC-AC topologies in a simple and generic way. The topology classifications are based on the location of the resonant network (load, inverter bridge, and bus), the characteristic of switching waveforms (zero-voltage switching or zero-current switching), and the type of resonance (series or parallel), operating principles, performance, and design limitations are discussed. Some possible industrial applications of soft-switched DC-AC power converters are also addressed.

262 citations

Journal ArticleDOI
TL;DR: Key communication infrastructure design aspects are looked into, and the key role of the telecommunications provision when upgrading and deploying distributed control solutions, as part of future ANM systems are focused on.
Abstract: Power distribution networks with distributed generators (DGs) can exhibit complex operational regimes which makes conventional management approaches no longer adequate. This paper looks into key communication infrastructure design aspects, and analyzes two representative evolution cases of Active Network Management (ANM) for distributed control. Relevant standard initiatives, communication protocols and technologies are introduced and underlying engineering challenges are highlighted. By analyzing two representative case networks (meshed and radial topologies) at different voltage levels (33 and 11 kV), this paper discusses the design considerations and presents performance results based on numerical simulations. This study focuses on the key role of the telecommunications provision when upgrading and deploying distributed control solutions, as part of future ANM systems.

262 citations

Journal ArticleDOI
TL;DR: The network generator meets the shortcomings of former network generators since it employs a wide range of different parameters which have been shown to serve as possible predictors of the hardness of different project scheduling problems.
Abstract: In this paper, we describe RanGen, a random network generator for generating activity-on-the-node networks and accompanying data for different classes of project scheduling problems The objective is to construct random networks which satisfy preset values of the parameters used to control the hardness of a problem instance Both parameters which are related to the network topology and resource-related parameters are implemented The network generator meets the shortcomings of former network generators since it employs a wide range of different parameters which have been shown to serve as possible predictors of the hardness of different project scheduling problems Some of them have been implemented in former network generators while others have not

261 citations

Journal ArticleDOI
TL;DR: A comprehensively survey hypervisors for SDN networks and exhaustively compare the network attribute abstraction and isolation features of the existing SDN hypervisors is exhaustively compared.
Abstract: Software defined networking (SDN) has emerged as a promising paradigm for making the control of communication networks flexible. SDN separates the data packet forwarding plane, i.e., the data plane, from the control plane and employs a central controller. Network virtualization allows the flexible sharing of physical networking resources by multiple users (tenants). Each tenant runs its own applications over its virtual network, i.e., its slice of the actual physical network. The virtualization of SDN networks promises to allow networks to leverage the combined benefits of SDN networking and network virtualization and has therefore attracted significant research attention in recent years. A critical component for virtualizing SDN networks is an SDN hypervisor that abstracts the underlying physical SDN network into multiple logically isolated virtual SDN networks (vSDNs), each with its own controller. We comprehensively survey hypervisors for SDN networks in this paper. We categorize the SDN hypervisors according to their architecture into centralized and distributed hypervisors. We furthermore sub-classify the hypervisors according to their execution platform into hypervisors running exclusively on general-purpose compute platforms, or on a combination of general-purpose compute platforms with general- or special-purpose network elements. We exhaustively compare the network attribute abstraction and isolation features of the existing SDN hypervisors. As part of the future research agenda, we outline the development of a performance evaluation framework for SDN hypervisors.

261 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,292
20223,051
20212,286
20202,746
20192,992
20183,259