published journal article
published journal article
conference paper
published journal article
published journal article
Cities worldwide are facing new challenges and opportunities with the proliferation of Unmanned Aerial Vehicles (UAVs), or drones. However, despite the increasing importance of managing drone activities at the local level, little is known about the extent to which cities adopt regulatory measures to deal with the challenges posed by this emerging technology and the factors that determine the local policy adopted. This study examines the dynamics of local drone policy adoption, focusing on California, which has the largest population of drones currently registered in the United States. A review of 482 California cities’ municipal codes shows evolving patterns of policy adoption over the last two decades, with a rapid expansion since 2015. Multivariate survival analysis indicates that policy adoption at the local level is shaped by both municipal capacity and motivation factors, including the actions of neighboring cities. The analysis also finds evidence of disparities associated with socio-demographics, calling for more attention to the variation in local policy responsiveness to technology-driven challenges and ways to support local efforts and their collaboration.
conference paper
In this era of heightened competition many firms have turned to supply chain partners to collaborate to alleviate their operational inefficiencies and cut costs. Supply chain relationships are transforming to collaborative ventures, sometimes even with their competitors. In this paper we study the issues facing an electronic intermediary or a third party logistics company for achieving collaboration for transportation demands from a group of small to medium sized shippers in an Internet marketplace. We develop a methodology for studying the shipper collaboration problems and provide formulations for partly loaded and truckload shipments. The underlying cost allocation issues facing the collaborations are examined from a cooperative game theory perspective. We point out that finding stable cost allocation mechanisms are NP-Hard and develop simple heuristic cost allocation mechanisms.
research report
conference paper
published journal article
MS Thesis
Due to heavy congestion and air pollutants emissions from the increase in container trucks traveling on the I-710, Caltrans and Metro have been looking into viable alternatives for solving these problems. The heavy health burden on residents of the areas surrounding the I-710 has been a cause for concern to these agencies for some time. In this study, I rely on microscopic traffic simulation and on operating modes (OpModes) lookup tables from MOVES to estimate changes in congestion and in emissions of various air pollutants (including nitrogen oxides (NOx) and particulate matter (PM)) resulting from the creation of electrified truck lanes on I-710. This alternative was tested for four scenarios corresponding to different percentage of electrified heavy-duty trucks in the I-710 corridor. My results show that creating electrified lanes would slightly reduce congestion in terms of average overall network speed. I also found a substantial reduction in the emissions of several air pollutants by port-related heavy duty trucks, which ranged from 44% to 94% in the scenarios considered. Overall, the reduction in emission possible by the electrification of the freight corridor is a significant improvement but as proposed, the electrification of the I-710 would also create additional traffic problems. This suggests that planning models (such as TransCad) are not sufficient to properly evaluate preliminary designs of freeway changes.