presentation
Exploring how infrastructure access and the built environment affect bicycling safety in OC & Housing affordability in Los Angeles County
Publication Date
March 7, 2023
Area of Expertise: Unspecified
presentation
Equity in Transit Agencies and TNC Partnerships: Exploring the Benefits from Service Zone Placement
Publication Date
March 7, 2023
Associated Project
Author(s)
Suggested Citation
Dylan Ando (2023) “Equity in Transit Agencies and TNC Partnerships: Exploring the Benefits from Service Zone Placement”. ITS-Irvine, 7 March. Available at: https://youtu.be/OCt7zCBv5nk?t=3182.Related Publications
conference paper |
Jan 2023
Equity in Transit Agencies and TNCs Partnerships: Exploring the Benefits From Service Zone Placement
102nd Transportation Research Board Annual Meeting 2023
published journal article
Fuse It or Lose It? Analyzing the Effects of Sensor Diversity on Multimodal Ensembles for Autonomous Vehicle Perception
IEEE Transactions on Intelligent Transportation Systems
Publication Date
January 1, 2025
Author(s)
Trier Mortlock, Luke Chen, Jonathon M. Smereka, Pramod Khargonekar, Mohammad Al Faruque
Suggested Citation
Trier Mortlock, Luke Chen, Jonathon M. Smereka, Pramod Khargonekar and Mohammad Abdullah Al Faruque (2025) “Fuse It or Lose It? Analyzing the Effects of Sensor Diversity on Multimodal Ensembles for Autonomous Vehicle Perception”, IEEE Transactions on Intelligent Transportation Systems, pp. 1–12. Available at: 10.1109/TITS.2025.3612873. published journal article
Climate anxiety among adolescents in a pediatric emergency department
Environmental Research: Health
Publication Date
December 1, 2025
Author(s)
Raymen Rammy Assaf, Shelby K Shelton, Tricia Morphew, Susan Clayton, Jun Wu
Abstract
Abstract A changing climate indirectly threatens health by acting as a stressor from perceived threats to well-being. Few studies assess youth-centered climate anxiety in clinical settings. The emergency department (ED) is a prominent source of adolescent mental health triage. The primary objective was to understand demographic and clinical predictors of climate anxiety among ED pediatric patients. Secondarily, to externally validate an abbreviated version of the climate change anxiety scale (CCAS). In this cross-sectional study, data was collected from 2023 to 2024 in a single-center pediatric ED, with 860 patients ages 12–17 years approached via convenience sampling; 116 did not complete study surveys. Exposures included demographic factors (age, gender, race, ethnicity, insurance payor), chief complaint type (mental health or medical), temporal season, and General Anxiety Disorder–7 (GAD-7) score. The main outcome was climate anxiety, measured on the CCAS. 744 participants, with 79.8% presenting with medical complaints and 28.1% reporting climate anxiety. Females had 1.49 times higher odds of experiencing greater climate anxiety compared to males (95% CI 1.05, 2.12), p =.027. Having public health insurance increased the odds of experiencing climate anxiety (OR = 1.82, 95% CI 1.21, 2.73), p =.004, as well as warm seasonality (OR = 1.51, 95% CI (1.07, 2.13), p =.018. Participants with moderate or severe GAD-7 had five times higher odds of elevated climate anxiety than those with minimal generalized anxiety ( p <.001). The CCAS-short form (CCAS-S) demonstrated high sensitivity (91.4%–96.8%) and specificity (85%–95.5%) in detecting mild to severe levels of distress compared to the full CCAS. A four-tiered threshold of CCAS-S severity showed excellent reliability (quadratic weighted kappa = 0.838). We identified clinical predictors of climate anxiety and externally validated the CCAS-S in a large pediatric cohort. Given the increasing impact of the changing climate on human health, we advocate utilizing the tool alongside routine pediatric mental health assessments.
Suggested Citation
Raymen Rammy Assaf, Shelby K Shelton, Tricia Morphew, Susan Clayton and Jun Wu (2025) “Climate anxiety among adolescents in a pediatric emergency department”, Environmental Research: Health, 3(4), p. 045001. Available at: 10.1088/2752-5309/ae09d2. published journal article
Time-phased geospatial siting analysis for renewable hydrogen production facilities under a billion-kilogram-scale build-out using California as an example
International Journal of Hydrogen Energy
Publication Date
August 1, 2022
Author(s)
Jeff Reed, Emily Dailey, Amber Fong, Scott Samuelsen
Suggested Citation
Jeffrey Reed, Emily Dailey, Amber Fong and G. Scott Samuelsen (2022) “Time-phased geospatial siting analysis for renewable hydrogen production facilities under a billion-kilogram-scale build-out using California as an example”, International Journal of Hydrogen Energy, 47(66), pp. 28224–28243. Available at: 10.1016/j.ijhydene.2022.06.179. published journal article
Information Barriers and Housing Tenure Choice: Does Local Knowledge Matter?
International Regional Science Review
Publication Date
September 13, 2025
Author(s)
Bessy Liao, Jae Hong Kim
Abstract
This paper examines how local knowledge about migration destinations affects housing tenure decisions for movers in the US, particularly long-distance movers–those who have moved more than 50 miles–while considering other channels of information. Using data from the American Community Survey from 2012 to 2019, we find that among long-distance movers, geographic distance seems to lower the likelihood of owning their next home, while social connectedness can mitigate this effect considerably. This result is robust across different empirical specifications. Our analysis also shows that these channels of information may have significantly different implications for short-distance movers’ housing tenure choices compared to long-distance movers.
Suggested Citation
Bessy Liao and Jae Hong Kim (2025) “Information Barriers and Housing Tenure Choice: Does Local Knowledge Matter?”, International Regional Science Review, p. 01600176251377399. Available at: 10.1177/01600176251377399. published journal article
Partnering with transportation network companies (TNCs) for low-demand service: is it viable and beneficial for transit agencies?
Transportation Research Part A: Policy and Practice
Publication Date
November 1, 2025
Author(s)
Abstract
In low-demand areas or during off-peak hours, fixed-route bus services often show low productivity when maintaining regular headways. Reducing headways further decreases service quality, presenting a challenge for transit agencies. This paper proposes a novel approach to solve the low productivity issue, by forming a partnership between transit agencies and Transportation Network Companies (TNCs), where TNC vehicles substitute fixed-route buses in certain segments. The study introduces a decision-making framework to help transit agencies assess when and where such partnerships are operationally feasible and financially sustainable. It identifies key factors that influence the viability of TNC substitution, including vehicle hours, mileage, and passenger loads. Based on these factors, the paper explores various compensation schemes and determines the cost of TNC operations—a critical component of the framework. The proposed framework is evaluated using a real-world case study in Long Beach, California, USA. Findings suggest that in low-demand scenarios, specifically when the number of passengers per stop is fewer than 0.5, replacing buses with TNC services reduces operating costs. The results also indicate that transit agencies should consider both cost savings and passenger experience while making substitution decisions, as truncating longer route segments may yield lower savings but may improve service for additional passengers. Overall, this research provides valuable insights for transit practitioners seeking to reduce expenses and enhance service quality in low-demand areas and off-peak hours through innovative public–private partnerships with TNCs.
Suggested Citation
Negin Shariat, Dingtong Yang and R. Jayakrishnan (2025) “Partnering with transportation network companies (TNCs) for low-demand service: is it viable and beneficial for transit agencies?”, Transportation Research Part A: Policy and Practice, 201, p. 104682. Available at: 10.1016/j.tra.2025.104682. published journal article
Degraded Work: The Struggle at the Bottom of the Labor Market
The AAG Review of Books
Publication Date
January 2, 2018
Author(s)
David Wilson, Robert W. Lake, Kimberley Kinder, Virginia Parks, Kevin Ward, Marc Doussard
Suggested Citation
David Wilson, Robert W. Lake, Kimberley Kinder, Virginia Parks, Kevin Ward and Marc Doussard (2018) “Degraded Work: The Struggle at the Bottom of the Labor Market”, The AAG Review of Books, 6(1), pp. 50–58. Available at: 10.1080/2325548X.2018.1402287. published journal article
Fossil Fuel Layoff: Capturing Decarbonization Impacts on Workers Through a Refinery Closure
Labor Studies Journal
Publication Date
March 1, 2025
Author(s)
Virginia Parks, Ian Baran
Abstract
We surveyed and interviewed oil refinery workers who lost their jobs when a refinery in California shutdown in October 2020 to document post-layoff employment outcomes. Workers experienced post-layoff median hourly wage losses of 24 percent, a 26 percent unemployment rate, and reported frustrating job search experiences marked by a difficulty to convey skills to new employers. Our study harbingers future transition experiences of fossil workers and identifies social insurance responses that could inhere within climate change policies to shield workers from economic risk. Workers identified a need for third-party certification of their skills, benefits negotiators, and wage supports.
Suggested Citation
Virginia Parks and Ian Baran (2025) “Fossil Fuel Layoff: Capturing Decarbonization Impacts on Workers Through a Refinery Closure”, Labor Studies Journal, 50(1), pp. 28–53. Available at: 10.1177/0160449X241281938. published journal article
DART: Distribution-Aware Hardware Trojan Detection
IEEE Transactions on Information Forensics and Security
Publication Date
January 1, 2025
Author(s)
Luke Chen, Youssef Gamal, Yanda Li, Shih-Yuan Yu, Ihsen Alouani, Mohammad Al Faruque