The Experts below are selected from a list of 21132 Experts worldwide ranked by ideXlab platform

M. Franchini - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of Non-Iterative Methods and Proposal of a New One for Pressure-Driven Snapshot Simulations with EPANET
    Water Resources Management, 2017
    Co-Authors: E. Pacchin, S. Alvisi, M. Franchini
    Abstract:

    This paper compares different recently proposed methods for pressure-driven snapshot simulations of water distribution networks using the EPANET software interface and proposes a new one. The proposed method is based on the insertion of a sequence of devices consisting of a General Purpose Valve (GPV), a fictitious junction, a reach with a check valve and a reservoir at each water Demand Node. The proposed method differs from other methods previously proposed in the literature – and similarly based on the insertion of sequences of devices consisting of a valve and a reservoir or emitter – in that it uses a GPV; more specifically, for this valve the user can fix the relationship between outflow discharge (or the flow delivered to users) and the available pressure head at the Node, thus allowing for a flexible representation of the relationship between these two parameters, whereas with the other methods this relationship remains fixed, based on the structure of the sequence of devices used. Practical applications to three different real-life cases show the unreliability and limits, in terms of accuracy, of some of the methods previously proposed in the literature. They also show, by contrast, the validity of the new method, which has proven to be reliable and accurate, as well as flexible, since it enables any relationship to be defined between the delivered flow and available head.

Phuoc Tran-gia - One of the best experts on this subject based on the ideXlab platform.

  • Spatial traffic estimation and characterization for mobile communication network design
    IEEE Journal on Selected Areas in Communications, 1998
    Co-Authors: Kurt Tutschku, Phuoc Tran-gia
    Abstract:

    This paper presents a new method for the estimation and characterization of the expected teletraffic in mobile communication networks. The method considers the teletraffic from the network viewpoint. The traffic estimation is based on the geographic traffic model, which obeys the geographical and demographical factors for the Demand for mobile communication services. For the spatial teletraffic characterization, a novel representation technique is introduced which uses the notion of discrete Demand Nodes. We show how the information in geographical information systems can be used to estimate the teletraffic Demand in an early phase of the network design process. Additionally, we outline how the discrete Demand Node representation facilitates the application of Demand-based automatic mobile network design algorithms

E. Pacchin - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of Non-Iterative Methods and Proposal of a New One for Pressure-Driven Snapshot Simulations with EPANET
    Water Resources Management, 2017
    Co-Authors: E. Pacchin, S. Alvisi, M. Franchini
    Abstract:

    This paper compares different recently proposed methods for pressure-driven snapshot simulations of water distribution networks using the EPANET software interface and proposes a new one. The proposed method is based on the insertion of a sequence of devices consisting of a General Purpose Valve (GPV), a fictitious junction, a reach with a check valve and a reservoir at each water Demand Node. The proposed method differs from other methods previously proposed in the literature – and similarly based on the insertion of sequences of devices consisting of a valve and a reservoir or emitter – in that it uses a GPV; more specifically, for this valve the user can fix the relationship between outflow discharge (or the flow delivered to users) and the available pressure head at the Node, thus allowing for a flexible representation of the relationship between these two parameters, whereas with the other methods this relationship remains fixed, based on the structure of the sequence of devices used. Practical applications to three different real-life cases show the unreliability and limits, in terms of accuracy, of some of the methods previously proposed in the literature. They also show, by contrast, the validity of the new method, which has proven to be reliable and accurate, as well as flexible, since it enables any relationship to be defined between the delivered flow and available head.

Kurt Tutschku - One of the best experts on this subject based on the ideXlab platform.

  • Demand based radio network planning of cellular mobile communication systems
    International Conference on Computer Communications, 1998
    Co-Authors: Kurt Tutschku
    Abstract:

    This paper presents a Demand-based engineering method for designing radio networks of cellular mobile communication systems. The proposed procedure is based on a forward-engineering method, the integrated approach to cellular network planning and is facilitated by the application of a new discrete population model for the traffic description, the Demand Node concept. The use of the concept enables the formulation of the transmitter locating task as a maximal coverage location problem (MCLP), which is well known in economics for modeling and solving facility location problems. For the network optimization task, we introduced the set cover base station positioning algorithm (SCBPA), which is based on a greedy heuristic for solving the MCLP problem. Furthermore, we present the planning tool prototype ICEPT (Integrated Cellular network Planning Tool), which is based on these ideas and show a first result from a real world planning case.

  • Spatial traffic estimation and characterization for mobile communication network design
    IEEE Journal on Selected Areas in Communications, 1998
    Co-Authors: Kurt Tutschku, Phuoc Tran-gia
    Abstract:

    This paper presents a new method for the estimation and characterization of the expected teletraffic in mobile communication networks. The method considers the teletraffic from the network viewpoint. The traffic estimation is based on the geographic traffic model, which obeys the geographical and demographical factors for the Demand for mobile communication services. For the spatial teletraffic characterization, a novel representation technique is introduced which uses the notion of discrete Demand Nodes. We show how the information in geographical information systems can be used to estimate the teletraffic Demand in an early phase of the network design process. Additionally, we outline how the discrete Demand Node representation facilitates the application of Demand-based automatic mobile network design algorithms

C. R. Suribabu - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Non-Zero Minimum Pressure Heads in Non-iterative Application of EPANET 2 in Pressure-Dependent Volume-Driven Analysis of Water Distribution Networks
    Water Resources Management, 2020
    Co-Authors: P. Sivakumar, Nikolai B. Gorev, Rajesh Gupta, Tiku T. Tanyimboh, Inna F. Kodzhespirova, C. R. Suribabu
    Abstract:

    While analysing a real network, the assumption of zero minimum pressure head as the elevation of Demand Node may lead to unrealistic results as some residual pressure is necessary to derive any outflow at the Node. A more realistic minimum pressure head plays an important role for analysis of an existing or proposed network. The present study extends a novel method of pressure-dependent volume driven-analysis by investigating the effects of realistic minimum pressure heads. The novelty of the proposed method is to evaluate the practical impact of the zero minimum pressure head assumption under pressure-deficient condition in water distribution networks considering pipe isolation, fire Demand, and altering total reservoir heads. The results obtained from the present method are compared with the results based on the more optimistic traditional assumption of zero minimum residual pressure-head. It is observed that time to fill the storage tanks under both normal and pressure-deficient conditions for non-zero minimum pressure head is higher. All the simulations were performed using graphical user interface of EPANET 2. Thus, the proposed approach can be used readily by researchers and practitioners without requiring any additional computational codes development.