4 results on '"Franz, Bryan A."'
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2. Exploring pathways to project success through project delivery team integration: a qualitative comparative analysis.
- Author
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Franz, Bryan W. and Olopade, Joseph
- Subjects
COMPARATIVE studies ,BUILDING design & construction ,TEAMS ,SUCCESS ,CONSTRUCTION projects - Abstract
Integration within project delivery teams can improve project outcomes in the building construction industry. However, integration across multiple firms and disciplines can be more challenging to manage, when compared to functionally organized, or siloed, teams. Given that resources to manage integration are limited and that most teams are only partially integrated in practice, this research seeks to explore pathways for their success. Using data collected from ten completed projects in the U.S., a fuzzy-set qualitative comparative analysis was performed to identify which combinations of six dimensions of integration were sufficient for improved project performance. The analysis revealed six distinct and highly consistent pathways to success, as evaluated by the criteria of being on-budget, on-time, or achieving the planned sustainable certification. Across all pathways, having a single team focus and equitable team relationships were the only dimensions consistently found in pathways leading to desirable project outcomes. Other dimensions, such as co-location, seamless operation across organizational boundaries, and a no-blame culture were found in pathways to both desirable and undesirable project outcomes, depending on their combination with other dimensions. These results contribute to theories on implementing team integration, suggesting that fully integrated teams are not always necessary for success. Instead, integrated teams that can work collaboratively, while still maintaining organizational separation or autonomy, can be as effective. While the study does not enable the identification of all possible pathways to success, it provides guidance to practitioners by highlighting a small subset of pathways, giving greater flexibility in managing integration within their teams. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Machine learning based aerosol and ocean color joint retrieval algorithm for multiangle polarimeters over coastal waters.
- Author
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Aryal K, Zhai PW, Gao M, Franz BA, Knobelspiesse K, and Hu Y
- Abstract
NASA's Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission, recently launched in February 2024, carries two multiangle polarimeters (MAPs): the UMBC Hyper-Angular Rainbow Polarimeter (HARP2) and SRON Spectropolarimeter for Planetary Exploration One (SPEXone). Measurements from these MAPs will greatly advance ocean ecosystem and aerosol studies as their measurements contain rich information on the microphysical properties of aerosols and hydrosols. The Multi-Angular Polarimetric Ocean coLor (MAPOL) joint retrieval algorithm has been developed to retrieve aerosol and ocean color information, which uses a vector radiative transfer (RT) model as the forward model. The RT model is computationally expensive, which makes processing a large amount of data challenging. FastMAPOL was developed to expedite retrieval using neural networks to replace the RT forward models. As a prototype study, FastMAPOL was initially limited to open ocean applications where the ocean Inherent Optical Properties (IOPs) were parameterized in terms of one parameter: chlorophyll-a concentration (Chla). In this study we further expand the FastMAPOL joint retrieval algorithm to incorporate NN based forward models for coastal waters, which use multi-parameter bio-optical models. In addition, aerosols are represented by six components, i.e., fine mode non absorbing insoluble (FNAI), brown carbon (BrC), black carbon (BC), fine mode non absorbing soluble (FNAS), sea salt (SS) and non-spherical dust (Dust). Sea salt and dust are coarse mode aerosols, while the other components are fine mode. The sizes and spectral refractive indices are fixed for each aerosol component, while their abundances are retrievable. The multi-parameter bio-optical model and aerosol components are chosen to represent the coastal marine environment. The retrieval algorithm is applied to synthetic measurements in three different configurations of MAPs in the PACE mission: HARP2 observations only, SPEXone observations only and combined HARP2 and SPEXone observations. The retrieval results from synthetic measurements show that for aerosol retrieval the SPEXone-only configuration works equally well with the HAPR2-only configuration. On the other hand, for ocean color retrieval the SPEXone instrument provides better information due to its larger spectral coverage. For the surface parameters (wind speed), HARP2 measurements provide better information due to its wide field of view. Combined measurement configuration HARP2+SPEXone performed the best to retrieve all aerosol, ocean color, and surface parameters. We also studied the impact of sun glint to aerosol and ocean color retrievals. The retrieval test revealed that wind speed and absorbing aerosol retrieval improves significantly when including measurements at glint geometries. Furthermore, the retrieval algorithm is equipped with modules for atmospheric correction and bidirectional reflectance distribution (BRDF) correction to obtain the remote sensing reflectance, which enables ocean biogeochemistry studies using the PACE polarimeter data.
- Published
- 2024
- Full Text
- View/download PDF
4. Spectral correlation in MODIS water-leaving reflectance retrieval uncertainty.
- Author
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Zhang M, Ibrahim A, Franz BA, Sayer AM, Werdell PJ, and McKinna LI
- Abstract
Spectral remote sensing reflectance, R
rs (λ) (sr-1 ), is the fundamental quantity used to derive a host of bio-optical and biogeochemical properties of the water column from satellite ocean color measurements. Estimation of uncertainty in those derived geophysical products is therefore dependent on knowledge of the uncertainty in satellite-retrieved Rrs . Furthermore, since the associated algorithms require Rrs at multiple spectral bands, the spectral (i.e., band-to-band) error covariance in Rrs is needed to accurately estimate the uncertainty in those derived properties. This study establishes a derivative-based approach for propagating instrument random noise, instrument systematic uncertainty, and forward model uncertainty into Rrs , as retrieved using NASA's multiple-scattering epsilon (MSEPS) atmospheric correction algorithm, to generate pixel-level error covariance in Rrs . The approach is applied to measurements from Moderate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite and verified using Monte Carlo (MC) analysis. We also make use of this full spectral error covariance in Rrs to calculate uncertainty in phytoplankton pigment chlorophyll-a concentration (chla , mg/m3 ) and diffuse attenuation coefficient of downwelling irradiance at 490 nm (Kd (490), m-1 ). Accounting for the error covariance in Rrs generally reduces the estimated relative uncertainty in chla by ∼1-2% (absolute value) in waters with chla < 0.25 mg/m3 where the color index (CI) algorithm is used. The reduction is ∼5-10% in waters with chla > 0.35 mg/m3 where the blue-green ratio (OCX) algorithm is used. Such reduction can be higher than 30% in some regions. For Kd (490), the reduction by error covariance is generally ∼2%, but can be higher than 20% in some regions. The error covariance in Rrs is further verified through forward-calculating chla from MODIS-retrieved and in situ Rrs and comparing estimated uncertainty with observed differences. An 8-day global composite of propagated uncertainty shows that the goal of 35% uncertainty in chla can be achieved over deep ocean waters (chla ≤ 0.1 mg/m3 ). While the derivative-based approach generates reasonable error covariance in Rrs , some assumptions should be updated as our knowledge improves. These include the inter-band error correlation in top-of-atmosphere reflectance, and uncertainties in the calibration of MODIS 869 nm band, in ancillary data, and in the in situ data used for system vicarious calibration.- Published
- 2024
- Full Text
- View/download PDF
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