Network topology

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

Extraction and analysis of traffic and topologies of transportation networks

Abstract: The knowledge of real-life traffic patterns is crucial for a good understanding and analysis of transportation systems. These data are quite rare. In this paper we propose an algorithm for extracting both the real physical topology and the network of traffic flows from timetables of public mass transportation systems. We apply this algorithm to timetables of three large transportation networks. This enables us to make a systematic comparison between three different approaches to construct a graph representation of a transportation network; the resulting graphs are fundamentally different. We also find that the real-life traffic pattern is very heterogenous, in both space and traffic flow intensities, which makes it very difficult to approximate the node load with a number of topological estimators.

The topology of dark networks

Abstract: Knowing the structure of criminal and terrorist networks could provide the technical insight needed to disrupt their activities.

Future Optical Networks

Abstract: This paper presents views on the future of optical networking. A historical look at the emergence of optical networking is first taken, followed by a discussion on the drivers pushing for a new and pervasive network, which is based on photonics and can satisfy the needs of a broadening base of residential, business, and scientific users. Regional plans and targets for optical networking are reviewed to understand which current approaches are judged important. Today, two thrusts are driving separate optical network infrastructure models, namely 1) the need by nations to provide a ubiquitous network infrastructure to support all the future services and telecommunication needs of residential and business users and 2) increasing demands by the scientific community for networks to support their requirements with respect to large-scale data transport and processing. This paper discusses these network models together with the key enabling technologies currently being considered for future implementation, including optical circuit, burst and packet switching, and optical code-division multiplexing. Critical subsystem functionalities are also reviewed. The discussion considers how these separate models might eventually merge to form a global optical network infrastructure

Adaptive quality-of-service reservation and pre-allocation for mobile systems

Abstract: In the field of Quality-of-Service (QoS) management for adaptive real-time services running on mobile devices which support different access technologies in dynamic wireless Internet Protocol (IP) networks, the connectivity of the applied nodes is unpredictable time-varying. In this context, a QoS management unit (304) is proposed that allows adaptive applications with real-time requirements in typical mobile wireless scenarios—e.g. a radio link with a changing transmission quality and handover procedures (2900)—to adaptively and responsively react to a time-varying network topology and different radio link characteristics. Said QoS management unit (304) provides methods of pre-allocating, reserving, monitoring and adapting QoS-related parameters in a dynamic mobile environment. The QoS management unit (304) comprises at least one analysis unit (306) which evaluates QoS requests received from other nodes (402 a/b , 404) to inform the application unit (328) of said mobile terminal (208) about the current QoS situation, at least one processing unit (312) that manages request messages (1200, 2000, 2400) for each type of QoS request, at least one monitoring unit (318) which monitors the current QoS situation within said mobile node (208) and initiates requests by activating the processing unit (312), and at least one generation unit (322) which is responsible for generating QoS requests or passing them on to the QoS management units (304) of other nodes (402 a+b , 404).

Modelling dendritic ecological networks in space: an integrated network perspective

Abstract: Dendritic ecological networks (DENs) are a unique form of ecological networks that exhibit a dendritic network topology (e.g. stream and cave networks or plant architecture). DENs have a dual spatial representation; as points within the network and as points in geographical space. Consequently, some analytical methods used to quantify relationships in other types of ecological networks, or in 2-D space, may be inadequate for studying the influence of structure and connectivity on ecological processes within DENs. We propose a conceptual taxonomy of network analysis methods that account for DEN characteristics to varying degrees and provide a synthesis of the different approaches within the context of stream ecology. Within this context, we summarise the key innovations of a new family of spatial statistical models that describe spatial relationships in DENs. Finally, we discuss how different network analyses may be combined to address more complex and novel research questions. While our main focus is streams, the taxonomy of network analyses is also relevant anywhere spatial patterns in both network and 2-D space can be used to explore the influence of multi-scale processes on biota and their habitat (e.g. plant morphology and pest infestation, or preferential migration along stream or road corridors).