conference paper
Towards Driving-Oriented Metric for Lane Detection Models
Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition
Publication Date
January 1, 2022
Area of Expertise: Unspecified
published journal article
The impact of plug-in vehicles on greenhouse gas and criteria pollutants emissions in an urban air shed using a spatially and temporally resolved dispatch model
Journal of Power Sources
Publication Date
December 1, 2011
Author(s)
Suggested Citation
Ghazal Razeghi, Tim Brown and G. Scott Samuelsen (2011) “The impact of plug-in vehicles on greenhouse gas and criteria pollutants emissions in an urban air shed using a spatially and temporally resolved dispatch model”, Journal of Power Sources, 196(23), pp. 10387–10394. Available at: 10.1016/j.jpowsour.2011.08.043. conference paper
UAV integrity monitoring measure improvement using terrestrial signals of opportunity
Proceedings of the 32nd international technical meeting of the satellite division of the institute of navigation (ION GNSS+ 2019)
Publication Date
October 1, 2019
Author(s)
Mahdi Maaref, Zaher Kassas
Suggested Citation
Mahdi Maaref and Zaher M. Kassas (2019) “UAV integrity monitoring measure improvement using terrestrial signals of opportunity”, in Proceedings of the 32nd international technical meeting of the satellite division of the institute of navigation (ION GNSS+ 2019). Institute of Navigation, pp. 3045–3056. Available at: 10.33012/2019.17009. published journal article
Business Churning and Neighborhood Instability: Is There a Link?
International Regional Science Review
Publication Date
January 12, 2023
Author(s)
Jae Hong Kim, Kevin Kane, Young-An Kim, John R. Hipp
Abstract
Much of the work concerning economic dynamism has focused on its aggregate-level implications, while there have been rising concerns about business displacement at the community or neighborhood level. In this article, we analyze this important (restructuring) process using detailed establishment-level business information and explore how it manifests itself across space within the Los Angeles—Long Beach—Santa Ana, CA Urbanized Area. We also investigate the association between business churning and neighborhood-level housing vacancy rates to understand the implications of dramatic changes in the business landscape. We find that housing vacancies are more likely to increase in urban neighborhoods with a higher establishment death rate, while the creation of new businesses can mitigate the association to some extent. We also detect substantial variation across decades not only in the spatial distribution of business churning but also in its association with housing vacancy rates, suggesting the evolving nature of business dynamics and their implications.
Suggested Citation
Jae Hong Kim, Kevin Kane, Young-An Kim and John R. Hipp (2023) “Business Churning and Neighborhood Instability: Is There a Link?”, International Regional Science Review, p. 01600176221145873. Available at: 10.1177/01600176221145873. published journal article
Valuing Sequences of Lives Lost or Saved Over Time: Preference for Uniform Sequences
Decision Analysis
Publication Date
March 1, 2020
Author(s)
Jeffery L. Guyse, Robin Keller, Candice H. Huynh
Abstract
Policymakers often make decisions involving human-mortality risks and monetary outcomes that span across different time periods and horizons. Many projects or environmental-regulation policies involving risks to life, such as toxic exposures, are experienced over time. The preferences of individuals on lives lost or saved over time should be understood to implement effective policies. Using a within-subject survey design, we investigated our participants’ elicited preferences (in the form of ratings) for sequences of lives saved or lost over time at the participant level. The design of our study allowed us to directly observe the possible preference patterns of negative time discounting or a preference for spreading from the responses. Additionally, we embedded factors associated with three other prevalent anomalies of intertemporal choice (gain/loss asymmetry, short/long asymmetry, and the absolute magnitude effect) into our study for control. We find that our participants exhibit three of the anomalies: preference for spreading, absolute magnitude effect, and short/long-term asymmetry. Furthermore, fitting the data collected, Loewenstein and Prelec’s model for the valuation of sequences of outcomes allowed for a more thorough understanding of the factors influencing the individual participants’ preferences. Based on the results, the standard discounting model does not accurately reflect the value that some people place on sequences of mortality outcomes. Preferences for uniform sequences should be considered in policymaking rather than applying the standard discounting model.
Suggested Citation
Jeffery L. Guyse, L. Robin Keller and Candice H. Huynh (2020) “Valuing Sequences of Lives Lost or Saved Over Time: Preference for Uniform Sequences”, Decision Analysis, 17(1), pp. 24–38. Available at: 10.1287/deca.2019.0397. book/book chapter
Conclusion: Reflections and Lessons from the Pandemic
Publication Date
January 1, 2023
Author(s)
Alexandre M. Bayen, R. (Jay) Jayakrishnan, Giovanni Circella, Anastasia Loukaitou-Sideris
Abstract
This concluding chapter presents a summary of the research findings in the previous chapters, along with some reflections for each of the five themes of the book and a discussion of necessary future responses (post-pandemic or in the event of a new pandemic) and topics that require further exploration. The pandemic brought into sharp relief pre-existing social disparities and affected vulnerable populations the most. The economic impacts of the pandemic were diverse and varied by geography, but again certain geographies and economic sectors were more buffered from negative outcomes than others. A lesson and a challenge for policymakers is to find ways to understand and reduce these disparities, instead of pushing them under the rug. The impacts on mobility and travel were dramatic as total trips decreased, transit usage fell dramatically, and telecommuting and active modes of transportation increased. Some positive impacts included an improved air quality, a reduced number of traffic crashes, and a proliferation of walking and biking in some neighbourhoods. As cities are slowly recovering from the pandemic, the challenge is to keep the positive impacts but also find ways to help the transit industry rebound from its plunge. Long-term impacts of the pandemic in terms of changing patterns of work and work arrangements, shopping, recreation, and other human activities that will affect travel need additional time and more research to discern.
Suggested Citation
Alexandre M. Bayen, R. Jayakrishnan, Giovanni Circella and Anastasia Loukaitou-Sideris (2023) “Conclusion: Reflections and Lessons from the Pandemic”, in A. Loukaitou-Sideris, A.M. Bayen, G. Circellaand R. Jayakrishnan (eds.) Pandemic in the Metropolis: Transportation Impacts and Recovery. Cham: Springer International Publishing (Springer Tracts on Transportation and Traffic), pp. 333–345. Available at: https://doi.org/10.1007/978-3-031-00148-2_21 (Accessed: October 5, 2023).
policy brief
Can California Power Electric Construction Equipment at Scale?
Publication Date
June 1, 2026
Author(s)
Abstract
California’s climate policies are accelerating the transition to zero-emission vehicles, but the construction sector faces a major barrier: access to reliable power at job sites. While electric excavators and loaders are entering the market, many construction sites—often temporary and in remote or constrained locations—lack the electrical infrastructure needed to support them. Grid connections are often too costly and take too long to install for construction projects, and existing grid infrastructure was not designed to handle the power demand of heavy machinery. Without practical charging solutions, electrifying the construction sector may lag behind state goals. Meanwhile, construction equipment is contributing 1% to 2% of California’s total greenhouse gas emissions. To better understand these challenges, the research team reviewed existing research, assessed available charging technologies, and spoke with utilities and energy providers across California. The research focuses on identifying key barriers and practical pathways to support construction electrification.
conference paper
On Data Fabrication in Collaborative Vehicular Perception: Attacks and Countermeasures
33rd USENIX Security Symposium (USENIX Security 24)
Publication Date
January 1, 2024
Author(s)
Qingzhao Zhang, Shuowei Jin, Ruiyang Zhu, Zhe (Jared) Sun, Xumiao Zhang, Qi Alfred Chen, Z. Morley Mao
Suggested Citation
Qingzhao Zhang, Shuowei Jin, Ruiyang Zhu, Jiachen Sun, Xumiao Zhang, Qi Alfred Chen and Z. Morley Mao (2024) “On Data Fabrication in Collaborative Vehicular Perception: Attacks and Countermeasures”. 33rd USENIX Security Symposium (USENIX Security 24), pp. 6309–6326. Available at: https://www.usenix.org/conference/usenixsecurity24/presentation/zhang-qingzhao (Accessed: September 13, 2024). MS Thesis
Essays in environmental economics and policy
Publication Date
January 1, 2008
Author(s)
Abstract
This dissertation comprises two essays that study normative environmental policy and the purported side effects of (already enacted) environmental policies. In the first essay, we analyze the management of a stock pollutant in a simplified economy using optimal control. The level of stock pollutant affects utility negatively and it may trigger a catastrophic event when it hits a predetermined threshold, which results in a sudden drop in utility. A numerical illustration for the case of global climate change shows that decision maker can delay the onset of a catastrophe by increasing abatement (by investing into green capital); and by improving the environmental performance of production technology. This delaying effect can be amplified by using both policy instruments in tandem. We also observe that the time to catastrophe slightly increases with a decrease in discounting factor; an increase in the amount of catastrophic damage and a decrease in post-catastrophe capital prices. The time period from 1979 to 2003 saw the emergence of Corporate Average Fuel Economy (CAFE) standards, fluctuating and then stabilizing gasoline prices, and an increased share of light trucks. In the second essay, we analyze the alleged causality of this increased share by the introduction of fuel economy standards. We estimate the market demand for fuel economy of domestic cars and light trucks using a polynomial lag model. The main result of this essay is that the rising share of light trucks in the new domestic vehicle sales can be attributed to the increase in personal incomes during the 25 years considered, aided by the provision of laxer fuel economy standards for light trucks. Moreover, the fuel economy standards did increase the fuel efficiency of domestic vehicles.
Suggested Citation
Dhawal Nagpal (2008) Essays in environmental economics and policy. PhD Dissertation. UC Irvine. Available at: https://uci.primo.exlibrisgroup.com/permalink/01CDL_IRV_INST/u4evf/cdi_proquest_journals_304650227. working paper
Economic and Occupational Causes of Transit Operator Absenteeism: A Review of Research
Publication Date
March 1, 1984
Author(s)
Working Paper
UCI-ITS-WP-84-3
Abstract
Transit operator absence from work is a costly and pervasive problem within public transport organizations. This paper reviews over forty international studies in order to document significant factors related to this phenomenon. We begin with a brief assessment of the magnitude and costs of operator absence and isolate two major theories which have been proposed to explain operator absence behavior: the income-leisure tradeoff and occupational stress. Case study reports from three U.S. public transport organizations are used to illustrate the range of factors which influence employee absence behavior. We conclude with suggestions for organizational changes which may serve to reduce operator absence and suggestions for further research.