The Experts below are selected from a list of 86961 Experts worldwide ranked by ideXlab platform

Mats Leijon - One of the best experts on this subject based on the ideXlab platform.

  • Offshore Deployments of Wave Energy Converters by Seabased Industry AB
    Journal of Marine Science and Engineering, 2017
    Co-Authors: Maria A. Chatzigiannakou, Irina Dolguntseva, Mats Leijon
    Abstract:

    Since 2008, Seabased Industry AB (SIAB) has manufactured and deployed several units of wave energy converters (WECs) of different design. The WECs are linear generators with point absorber buoy systems that are placed on the seabed, mounted on a gravitation concrete foundation. These Deployments have taken place in different areas, using different Deployment vessels. Offshore Deployments of WECs and underwater substations have so far been complicated procedures, that were both expensive and time-consuming. The focus of this paper is to discuss these Deployments in terms of economy and time efficiency, as well as safety. Because seven vessels have been used to facilitate the Deployments, an evaluation on the above basis is carried out for them. The main conclusions and certain solutions are presented for the various problems encountered during these Deployments and the vessel choice is discussed. It is found that the offshore Deployment Process can be optimized in terms of cost, time efficiency and safety with a careful vessel choice, use of the latest available technologies and detailed planning and organizing.

  • offshore Deployment of point absorbing wave energy converters with a direct driven linear generator power take off at the lysekil test site
    Proceedings of the 33rd International Conference on Ocean Offshore and Arctic Engineering ASME 2014, 2014
    Co-Authors: Maria A. Chatzigiannakou, Irina Dolguntseva, Mats Leijon
    Abstract:

    Within the year 2013, four linear generators with point absorber buoy systems were deployed in the Lysekil test site. Until now, Deployments of these point absorbing wave energy converters have been expensive, time consuming, complicated and raised safety issues. In the present paper, we focus on the analysis and optimization of the offshore Deployment Process of wave energy converters with a linear generator power take-off which has been constructed by Uppsala University. To address the crucial issues regarding the Deployment difficulties, case study of previous offshore Deployments at the Lysekil test site are presented regarding such parameters as safety, cost and time efficiency. It was discovered that the Deployment Process can be improved significantly, mainly by using new technologies, e.g., new specialized Deployment vessels, underwater robots for inspections and for connecting cables and an automatized pressurizing Process. Addressing the main Deployment difficulties and constrains leads us to discovery of methods that makes offshore Deployments more cost-efficient and faster, in a safety context.

Philippe Lalanda - One of the best experts on this subject based on the ideXlab platform.

  • rondo a tool suite for continuous Deployment in dynamic environments
    IEEE International Conference on Services Computing, 2015
    Co-Authors: Ozan Gunalp, Clement Escoffier, Philippe Lalanda
    Abstract:

    Driven by the emergence of new computing environments, dynamically evolving software systems makes it impossible for developers to deploy software with human-centric Processes. Instead, there is an increasing need for automation tools that continuously deploy software into execution, in order to push updates or adapt existing software regarding contextual and business changes. Existing solutions fall short on providing fault-tolerant, reproducible Deployments that can scale on heterogeneous environments. In this paper we present Rondo, a tool suite that enables continuous Deployment for dynamic, service-oriented applications. At the center of these tools, we propose a deterministic and idem potent Deployment Process. We provide with Rondo a Deployment manager that implements this Process and capable of conducting Deployments and continuously adapting applications according to the changes in the current target platform. The tool suite also includes a domain-specific language for describing Deployment requests. We validate our approach in multiple projects, for provisioning the platform as well as for installing applications and continuous reconfigurations.

  • requirements to pervasive system continuous Deployment
    International Conference on Service Oriented Computing, 2013
    Co-Authors: Clement Escoffier, Ozan Gunalp, Philippe Lalanda
    Abstract:

    Pervasive applications present stringent requirements that make their Deployment especially challenging. The unknown and fluctuating environment in which pervasive applications are executed makes traditional approaches not suitable. In addition, the current trend to build applications out of separated components and services makes the Deployment Process inherently continuous and dynamic. In the last years, we developed several industrial pervasive platforms and applications. From these experiences, we identified ten requirements vital to support the continuous Deployment of pervasive systems. In this paper we present these requirements and the associated challenges.

Maria A. Chatzigiannakou - One of the best experts on this subject based on the ideXlab platform.

  • Offshore Deployments of Wave Energy Converters by Seabased Industry AB
    Journal of Marine Science and Engineering, 2017
    Co-Authors: Maria A. Chatzigiannakou, Irina Dolguntseva, Mats Leijon
    Abstract:

    Since 2008, Seabased Industry AB (SIAB) has manufactured and deployed several units of wave energy converters (WECs) of different design. The WECs are linear generators with point absorber buoy systems that are placed on the seabed, mounted on a gravitation concrete foundation. These Deployments have taken place in different areas, using different Deployment vessels. Offshore Deployments of WECs and underwater substations have so far been complicated procedures, that were both expensive and time-consuming. The focus of this paper is to discuss these Deployments in terms of economy and time efficiency, as well as safety. Because seven vessels have been used to facilitate the Deployments, an evaluation on the above basis is carried out for them. The main conclusions and certain solutions are presented for the various problems encountered during these Deployments and the vessel choice is discussed. It is found that the offshore Deployment Process can be optimized in terms of cost, time efficiency and safety with a careful vessel choice, use of the latest available technologies and detailed planning and organizing.

  • offshore Deployment of point absorbing wave energy converters with a direct driven linear generator power take off at the lysekil test site
    Proceedings of the 33rd International Conference on Ocean Offshore and Arctic Engineering ASME 2014, 2014
    Co-Authors: Maria A. Chatzigiannakou, Irina Dolguntseva, Mats Leijon
    Abstract:

    Within the year 2013, four linear generators with point absorber buoy systems were deployed in the Lysekil test site. Until now, Deployments of these point absorbing wave energy converters have been expensive, time consuming, complicated and raised safety issues. In the present paper, we focus on the analysis and optimization of the offshore Deployment Process of wave energy converters with a linear generator power take-off which has been constructed by Uppsala University. To address the crucial issues regarding the Deployment difficulties, case study of previous offshore Deployments at the Lysekil test site are presented regarding such parameters as safety, cost and time efficiency. It was discovered that the Deployment Process can be improved significantly, mainly by using new technologies, e.g., new specialized Deployment vessels, underwater robots for inspections and for connecting cables and an automatized pressurizing Process. Addressing the main Deployment difficulties and constrains leads us to discovery of methods that makes offshore Deployments more cost-efficient and faster, in a safety context.

Goodarz Ahmadi - One of the best experts on this subject based on the ideXlab platform.

  • IMECE2011-65669 Deployment DYNAMICS OF A SMALL CARBON FIBER TAPE-SPRING UAV
    2015
    Co-Authors: Peter Coffin, Pier Marzocca, Ratan Jha, Goodarz Ahmadi
    Abstract:

    Many mechanisms exist for folding and deploying wing surfaces on micro-scale unmanned air vehicles. A rolling tape-spring style wing offers simple construction, small mass, and compact packed volume. Deployment of the wing during flight would be advantageous for autonomous MAV launch, however the Deployment Process presents potential buckling issues due to the Deployment dynamics and aero-structure interaction. In this study a finite element model of an example wing is developed and its Deployment dynamics are compared against an experimental model. Additionally, elastic material properties are estimated using model updating, comparing predicted natural frequencies to those measured by a laser vibrometer experimentally. To better evaluate the Deployment dynamics of the finite element model, in experiment a vacuum chamber is used to decouple the aero and structural dynamics. The computational results are compared with the experimental finding and good agreement was observed. NOMENCLATURE C = Damping coefficient matrix K = Stiffness matrix M = Mass matrix α = First Rayleigh Damping coefficient β = Second Rayleigh Damping coefficient ωi = ith natural frequency ζ = Critical damping coefficien

  • Deployment dynamics of a small carbon fiber tape spring uav wing
    Volume 1: Advances in Aerospace Technology; Energy Water Nexus; Globalization of Engineering; Posters, 2011
    Co-Authors: Peter Coffin, Pier Marzocca, Ratan Jha, Goodarz Ahmadi
    Abstract:

    Many mechanisms exist for folding and deploying wing surfaces on micro-scale unmanned air vehicles. A rolling tape-spring style wing offers simple construction, small mass, and compact packed volume. Deployment of the wing during flight would be advantageous for autonomous MAV launch, however the Deployment Process presents potential buckling issues due to the Deployment dynamics and aero-structure interaction. In this study a finite element model of an example wing is developed and its Deployment dynamics are compared against an experimental model. Additionally, elastic material properties are estimated using model updating, comparing predicted natural frequencies to those measured by a laser vibrometer experimentally. To better evaluate the Deployment dynamics of the finite element model, in experiment a vacuum chamber is used to decouple the aero and structural dynamics. The computational results are compared with the experimental finding and good agreement was observed.Copyright © 2011 by ASME

Laure Toutai - One of the best experts on this subject based on the ideXlab platform.

  • reliable Process for security policy Deployment
    International Conference on Security and Cryptography, 2007
    Co-Authors: Stere Preda, Frédéric Cuppens, Nora Cuppensboulahia, Joaquin Garcia Alfaro, Laure Toutai
    Abstract:

    We focus in this paper on the problem of configuring and managing network security devices, such as Firewalls, Virtual Private Network (VPN) tunnels, and Intrusion Detection Systems (IDSs). Our proposal is the following. First, we formally specify the security requirements of a given system by using an expressive access control model. As a result, we obtain an abstract security policy, which is free of ambiguities, redundancies or unnecessary details. Second, we deploy such an abstract policy through a set of automatic compilations into the security devices of the system. This proposed Deployment Process not only simplifies the security administrator’s job, but also guarantees a resulting configuration free of anomalies and/or inconsistencies.