The Experts below are selected from a list of 42 Experts worldwide ranked by ideXlab platform

Rafael Sacks - One of the best experts on this subject based on the ideXlab platform.

  • An Automated System for Projection of Interior Construction Layouts
    IEEE Transactions on Automation Science and Engineering, 2019
    Co-Authors: Amir Degani, Wen Bo Li, Rafael Sacks
    Abstract:

    Layout of the interior works during building Construction is time consuming and error prone. Given the cost involved, both for initial layout and for later rework where errors occur, researchers have sought to automate the layout task. Some have adopted marker-less augmented reality methods using heads-up displays or cameras, and others have proposed robots capable of marking out the works. The former encumber the workers, the latter are expensive to set up and are sensitive to site conditions, and neither has yet achieved the required accuracy. In this paper, we propose a more efficient approach to project relevant information from a building information model (BIM) onto the Construction Surface, directly augmenting the Construction site with the design information. This is done using a portable system consisting of a 2-D laser scanner, an angled adjustable projector, and a camera. The system localizes itself within the already built outer walls using the laser scanner and the BIM model using a method derived from robotic mapping; it calibrates the projection correction parameters (keystone correction) using image analysis; and it projects the information with the angled projector. Testing results showed that the localization was accurate within a few millimeters and less than 3°, and the final projected image's error was approximately 1 cm. Initial calibration requires less than 1 min and does not require specialist skills. The system automates the layout task, preserves accuracy, and can provide rich model information on any interior Surface.

Amir Degani - One of the best experts on this subject based on the ideXlab platform.

  • An Automated System for Projection of Interior Construction Layouts
    IEEE Transactions on Automation Science and Engineering, 2019
    Co-Authors: Amir Degani, Wen Bo Li, Rafael Sacks
    Abstract:

    Layout of the interior works during building Construction is time consuming and error prone. Given the cost involved, both for initial layout and for later rework where errors occur, researchers have sought to automate the layout task. Some have adopted marker-less augmented reality methods using heads-up displays or cameras, and others have proposed robots capable of marking out the works. The former encumber the workers, the latter are expensive to set up and are sensitive to site conditions, and neither has yet achieved the required accuracy. In this paper, we propose a more efficient approach to project relevant information from a building information model (BIM) onto the Construction Surface, directly augmenting the Construction site with the design information. This is done using a portable system consisting of a 2-D laser scanner, an angled adjustable projector, and a camera. The system localizes itself within the already built outer walls using the laser scanner and the BIM model using a method derived from robotic mapping; it calibrates the projection correction parameters (keystone correction) using image analysis; and it projects the information with the angled projector. Testing results showed that the localization was accurate within a few millimeters and less than 3°, and the final projected image's error was approximately 1 cm. Initial calibration requires less than 1 min and does not require specialist skills. The system automates the layout task, preserves accuracy, and can provide rich model information on any interior Surface.

Wee Sang Park - One of the best experts on this subject based on the ideXlab platform.

  • Microstrip Antenna for SAR Application with Composite Sandwich Construction: Surface-antenna-structure Demonstration
    Journal of Composite Materials, 2003
    Co-Authors: Chi-sang You, Hc Park, Rm Lee, Wooseon Hwang, Wee Sang Park
    Abstract:

    A 5.3 GHz microstrip antenna for use in synthetic aperture radar (SAR) systems was developed with a composite sandwich Construction, using composite laminates, Nomex honeycomb and aluminum alloy. This is the Surface-antenna-structure (SAS) for application to load-bearing structural Surfaces. The design concept originated from a composite sandwich structure and a multi-layer microstrip antenna. Design, fabrication and validation of structural/electrical performances were all demonstrated. To verify the structural rigidity, flexural behavior was observed under the three-point bending test and was compared with two kinds of composite sandwich beams consisting of CFRP–GFRP skins and Nomex honeycomb core. Electrical measurements of the fabricated antenna array were in good agreement with design requirements, and a comparative study found that SAS has good mechanical characteristics. The SAS concept can be extended to give a useful guide to manufacturers of structural body panels as well as antenna designers, p...

Ws Park - One of the best experts on this subject based on the ideXlab platform.

  • Microstrip antenna for SAR application with composite sandwich Construction: Surface-antenna-structure demonstration
    'SAGE Publications', 2019
    Co-Authors: Cs You, Hwang W, Hc Park, Rm Lee, Ws Park
    Abstract:

    A 5.3 GHz microstrip antenna for use in synthetic aperture radar (SAR) systems was developed with a composite sandwich Construction, using composite laminates, Nomex honeycomb and aluminum alloy. This is the Surface-antenna-structure (SAS) for application to load-bearing structural Surfaces. The design concept originated from a composite sandwich structure and a multi-layer microstrip antenna. Design, fabrication and validation of structural/electrical performances were all demonstrated. To verify the structural rigidity, flexural behavior was observed under the three-point bending test and was compared with two kinds of composite sandwich beams consisting of CFRP-GFRP skins and Nomex honeycomb core. Electrical measurements of the fabricated antenna array were in good agreement with design requirements, and a comparative study found that SAS has good mechanical characteristics. The SAS concept can be extended to give a useful guide to manufacturers of structural body panels as well as antenna designers, promising innovative future communication technology.X13

Hc Park - One of the best experts on this subject based on the ideXlab platform.

  • Microstrip antenna for SAR application with composite sandwich Construction: Surface-antenna-structure demonstration
    'SAGE Publications', 2019
    Co-Authors: Cs You, Hwang W, Hc Park, Rm Lee, Ws Park
    Abstract:

    A 5.3 GHz microstrip antenna for use in synthetic aperture radar (SAR) systems was developed with a composite sandwich Construction, using composite laminates, Nomex honeycomb and aluminum alloy. This is the Surface-antenna-structure (SAS) for application to load-bearing structural Surfaces. The design concept originated from a composite sandwich structure and a multi-layer microstrip antenna. Design, fabrication and validation of structural/electrical performances were all demonstrated. To verify the structural rigidity, flexural behavior was observed under the three-point bending test and was compared with two kinds of composite sandwich beams consisting of CFRP-GFRP skins and Nomex honeycomb core. Electrical measurements of the fabricated antenna array were in good agreement with design requirements, and a comparative study found that SAS has good mechanical characteristics. The SAS concept can be extended to give a useful guide to manufacturers of structural body panels as well as antenna designers, promising innovative future communication technology.X13

  • Microstrip Antenna for SAR Application with Composite Sandwich Construction: Surface-antenna-structure Demonstration
    Journal of Composite Materials, 2003
    Co-Authors: Chi-sang You, Hc Park, Rm Lee, Wooseon Hwang, Wee Sang Park
    Abstract:

    A 5.3 GHz microstrip antenna for use in synthetic aperture radar (SAR) systems was developed with a composite sandwich Construction, using composite laminates, Nomex honeycomb and aluminum alloy. This is the Surface-antenna-structure (SAS) for application to load-bearing structural Surfaces. The design concept originated from a composite sandwich structure and a multi-layer microstrip antenna. Design, fabrication and validation of structural/electrical performances were all demonstrated. To verify the structural rigidity, flexural behavior was observed under the three-point bending test and was compared with two kinds of composite sandwich beams consisting of CFRP–GFRP skins and Nomex honeycomb core. Electrical measurements of the fabricated antenna array were in good agreement with design requirements, and a comparative study found that SAS has good mechanical characteristics. The SAS concept can be extended to give a useful guide to manufacturers of structural body panels as well as antenna designers, p...