The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

John A Stankovic - One of the best experts on this subject based on the ideXlab platform.

  • an in Field Maintenance framework for wireless sensor networks
    Distributed Computing in Sensor Systems, 2008
    Co-Authors: John A Stankovic
    Abstract:

    This paper introduces a framework for in-Field-Maintenance services for wireless sensor networks. The motivation of this work is driven by an observation that many applications using wireless sensor networks require one-time deployment and will be largely unattended. It is also desirable for the applications to have a long system lifetime. However, the performance of many individual protocols and the overall performance of the system deteriorate over time. The framework we present here allows the system or each individual node in the network to identify the performance degradation, and to act to bring the system back to a desirable coherent state. We implement and apply our framework to a case study for a real system, called VigilNet [5]. The performance evaluation demonstrates that our framework is effective and efficient.

  • DCOSS - An In-Field-Maintenance Framework for Wireless Sensor Networks
    Distributed Computing in Sensor Systems, 2008
    Co-Authors: John A Stankovic
    Abstract:

    This paper introduces a framework for in-Field-Maintenance services for wireless sensor networks. The motivation of this work is driven by an observation that many applications using wireless sensor networks require one-time deployment and will be largely unattended. It is also desirable for the applications to have a long system lifetime. However, the performance of many individual protocols and the overall performance of the system deteriorate over time. The framework we present here allows the system or each individual node in the network to identify the performance degradation, and to act to bring the system back to a desirable coherent state. We implement and apply our framework to a case study for a real system, called VigilNet [5]. The performance evaluation demonstrates that our framework is effective and efficient.

Óscar Ferreira - One of the best experts on this subject based on the ideXlab platform.

  • The autonomous Simpatico system for real-time continuous water-quality and current velocity monitoring: examples of application in three Portuguese estuaries
    Geo-Marine Letters, 2009
    Co-Authors: Erwan Garel, Susana Nunes, João Magalhães Neto, Rodrigo Fernandes, Ramiro Neves, João Carlos Marques, Óscar Ferreira
    Abstract:

    This technical paper describes an autonomous recording system with remote data access for the continuous, long-term in situ monitoring of water quality and discharge, as well as current velocity. The Simpatico system has been recently deployed in three estuaries in Portugal (Mondego and Tagus in July 2007; Guadiana in March 2008), highly suitable to illustrate its multifaceted potential applications: surveillance of the effects of mitigation measures to combat eutrophication (lower Mondego Estuary); real-time implementation of boundary conditions for a water modelling system (upper Tagus Estuary); study of dam-induced impacts in terms of water quality, water discharge and sediment budgets (mouth of the Guadiana Estuary). An extract of recorded data serves as an example to discuss data reliability, as well as Field Maintenance of the system, with implications for labour and operational costs. The use of a new generation of copper-based anti-biofouling kits significantly reduced the need for Field Maintenance operations. Other examples of possible application of the system include the assessment of gas accumulation in coastal waters.

Seong Jong Joo - One of the best experts on this subject based on the ideXlab platform.

  • Scheduling preventive Maintenance for modular designed components: A dynamic approach
    European Journal of Operational Research, 2009
    Co-Authors: Seong Jong Joo
    Abstract:

    One of the benefits of modular design is ease-of-service. While modular design helps simplify Field Maintenance, extensive depot Maintenance and spare modules are required to support the Field Maintenance. This study develops a dynamic approach for scheduling preventive Maintenance at a depot with the limited availability of spare modules and other constraints. A backward allocation algorithm is proposed and applied to scheduling the preventive Maintenance of an engine module installed in T-59 advanced jet trainers in the Republic of Korea Air Force. The algorithm developed by this study can be used to solve similar problems for various systems such as aerospace vehicles, heavy machinery, and medical equipment. The contribution of this study includes the uniqueness of the algorithm, the flexibility to deal with variables changing over time, and the ability to incorporate additional variables to handle complex situations. © 2007 Elsevier B.V. All rights reserved.

Ashutosh Tiwari - One of the best experts on this subject based on the ideXlab platform.

  • Winter Simulation Conference - Rapid modeling of Field Maintenance using discrete event simulation
    Proceedings of the 2011 Winter Simulation Conference (WSC), 2011
    Co-Authors: Abdullah A. Alabdulkarim, Peter Ball, Ashutosh Tiwari
    Abstract:

    Discrete event simulation has been applied to a wide range of applications areas due to its ability to represent stochastic systems over time. Maintenance, particularly Field Maintenance, is complex due to the interaction of different sub-systems of use, Maintenance, repair and inventory and the conflicting demands of minimizing cost and maximizing availability. The area of simulation of Maintenance systems receives little treatment in the literature and tends to focus on reliability modeling of individual assets. The work presented here documents research to fill this gap by specifying, creating and testing simulation functionality to rapidly model Field Maintenance systems.

  • Rapid modeling of Field Maintenance using discrete event simulation
    Proceedings of the 2011 Winter Simulation Conference (WSC), 2011
    Co-Authors: Abdullah A. Alabdulkarim, Peter D. Ball, Ashutosh Tiwari
    Abstract:

    Discrete event simulation has been applied to a wide range of applications areas due to its ability to represent stochastic systems over time. Maintenance, particularly Field Maintenance, is complex due to the interaction of different sub-systems of use, Maintenance, repair and inventory and the conflicting demands of minimizing cost and maximizing availability. The area of simulation of Maintenance systems receives little treatment in the literature and tends to focus on reliability modeling of individual assets. The work presented here documents research to fill this gap by specifying, creating and testing simulation functionality to rapidly model Field Maintenance systems.

E. Chin-ping Chang - One of the best experts on this subject based on the ideXlab platform.

  • Integration of simulation model and traffic signal controller
    Proceedings of VNIS'94 - 1994 Vehicle Navigation and Information Systems Conference, 1994
    Co-Authors: E. Chin-ping Chang
    Abstract:

    Effective traffic signal control, practical signal controller implementation, and optimum timing design are important to urban operations. Computer simulation programs are often used for off-line analysis. The "real-time, on-line simulation" or "hardware-in-the-loop" design by combining control hardware and performance evaluation is promising. This paper describes an innovative input/output interface design to take advantage of the available simulation models to improve future signal controller design and Field Maintenance. >