| 1. |
- Guan, Xiaowei, et al.
(author)
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Ultrasmall Directional Coupler and Disk-resonantor Based on Nano-scale Silicon Hybrid Plasmonic Waveguides
- 2012
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In: 2012 Asia Communications And Photonics Conference (ACP). - Washington, D.C. : OSA. - 9781467362740 ; , s. AS2H.4-
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Conference paper (peer-reviewed)abstract
- Nanophotonic integrated devices based on nano-scale silicon hybrid plasmonic waveguides have been demonstrated experimentally, including directional couplers and disk-resonators. The temperature-dependence of the hybrid plasmonic disk-resonators is also characterized.
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| 2. |
- Holguín-Veras, José, et al.
(author)
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Fostering unassisted off-hour deliveries: the role of incentives
- 2017
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In: Transportation Research Part A: Policy and Practice. - : Elsevier BV. - 0965-8564. ; 102, s. 172-187
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Journal article (peer-reviewed)abstract
- This paper describes the chief findings of research conducted to assess the willingness of receivers of supplies to accept unassisted off-hour deliveries (U-OHD), which are those conducted outside regular business hours and without the assistance of the receiving establishment staff. U-OHD have potential to increase economic competitiveness, reduce congestion, improve environmental conditions, enhance livability, and increase quality of life in urban areas. This study considers the role that public policy initiatives could play in fostering receivers’ acceptance of U-OHD by analyzing survey data collected from potential U-OHD adopters. The paper describes the survey conducted, performs descriptive analyses of the data, analyzes the respondents’ stated willingness to participate in unassisted off-hour deliveries, estimates discrete choice models to gain insight into receivers’ decision-making processes, and analyzes the effectiveness of alternative policy scenarios. It is found that a number of policy levers can foster U-OHD: (1) public sector provision of a one-time incentive, a public recognition program, and business support services; (2) carriers providing shipping discounts to receivers of U-OHD; and (3) the creation of a Trusted Vendor Certification Program.
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| 3. |
- Holguín-Veras, José, et al.
(author)
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Freight mode choice: Results from a nationwide qualitative and quantitative research effort
- 2021
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In: Transportation Research Part A: Policy and Practice. - : Elsevier BV. - 0965-8564. ; 143, s. 78-120
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Journal article (peer-reviewed)abstract
- The research reported in this paper focused on studying various aspects of freight mode choice in the continental United States (US) including the influencing factors, the development of econometric models to assess the impacts of public-sector policies and changes in market conditions. To gain insight into this complex subject, the team used qualitative and quantitative research techniques. The qualitative effort involved In-Depth Interviews (IDIs) with a highly selective group of leading shippers, carriers, and receivers. The IDIs provided insight into the key factors that influence mode choice, and the barriers that limit mode shifts. The quantitative effort estimated econometric models that express freight mode choice as a function of key independent variables. A unique aspect of this research is that the models were estimated using high-quality confidential data under the custody of the United States’ Census Bureau, the Internal Revenue Service, and the Surface Transportation Board, including: the Commodity Flow Survey (CFS), the largest shipper survey in the world; the Longitudinal Business Database (LBD), a comprehensive registry of commercial establishments in the US; and the Waybill Sample, a 5% sample; together with custom-made datasets of modal characteristics prepared by the authors. Using these data, the team estimated discrete-continuous freight mode choice models representing the choice of rail or truck for 42 different commodity types, and different combinations of independent variables and weighting schemes. The paper concludes with a discussion of the policy implications of the research conducted.
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