conference paper

Cvo perspectives on the usefulness of various sources of traffic information

Proceedings of the 80th annual meeting of the transportation research board

Publication Date

January 1, 2001

Abstract

The objective of this research is to understand how trucking companies perceive the benefits of traditional and advanced traveler information sources. There is considerable interest in identifying the appropriate public sector role for investments in real-time traveler information sources. Managers in charge of the California operations of more than 1,100 private and for-hire trucking companies were asked to evaluate the usefulness of various sources of traffic information. These evaluations were collected on ordinal scales, and nonlinear canonical correlations analysis models were computed to simultaneously link company characteristics and perceptions of the value of information sources for dispatchers and for drivers. In addition, perceptions of the benefits of a set of improved sources of accurate, up-to-the- minute traffic information were examined. The results show how segments of the trucking industry value different sources of traffic information

Suggested Citation
Thomas F. Golob and Amelia C. Regan (2001) “Cvo perspectives on the usefulness of various sources of traffic information”, in Proceedings of the 80th annual meeting of the transportation research board, p. 30 p..

book/book chapter

Chapter 1: The role of planning

Publication Date

December 12, 2023

Author(s)

Abstract

In order to address some of the most pressing problems of the twenty-first century, such as climate change and income inequality, land-use law must facilitate residential infill development – the construction of new housing and supportive infrastructure in areas with significant existing development. Planning and zoning have often been used to thwart infill development and foster urban sprawl, and this chapter explores their role in promoting infill development. It first describes the relationship between land-use planning and zoning in the US, and then discusses different scales of planning (i.e., local and regional). It then illustrates potential avenues for research on shifts in land-use law to promote infill development, with examples from the substantive domains of transportation planning and housing planning.

Suggested Citation
Nicholas J. Marantz (2023) “Chapter 1: The role of planning”. Available at: https://www.elgaronline.com/edcollchap/book/9781803928203/book-part-9781803928203-8.xml (Accessed: October 23, 2024).

conference paper

Simultaneous tracking of orbcomm LEO satellites and inertial navigation system aiding using Doppler measurements

2019 IEEE 89th vehicular technology conference (VTC2019-Spring)

Publication Date

April 1, 2019

Author(s)

Joshua Morales, Joe Khalife, Zaher Kassas

Abstract

A framework for simultaneously tracking Orbcomm low Earth orbit (LEO) satellites and using Doppler measurements drawn from their signals to aid a vehicle’s inertial navigation system (INS) is developed. The developed framework enables a navigating vehicle to exploit ambient Orbcomm LEO satellite signal Doppler measurements to aid its INS in a tightly-coupled fashion in the event global navigation satellite system (GNSS) signals become unusable. An overview of the extended Kalman filter-based simultaneous tracking and navigation (STAN) framework is provided. Experimental results are presented showing an unmanned aerial vehicle (UAV) aiding its INS with Doppler measurements drawn from two Orbcomm LEO satellites, reducing the final position error from 31.7 m to 8.9 m after 30 seconds of GNSS unavailability.

Suggested Citation
Joshua Morales, Joe Khalife and Zaher M. Kassas (2019) “Simultaneous tracking of orbcomm LEO satellites and inertial navigation system aiding using Doppler measurements”, in 2019 IEEE 89th vehicular technology conference (VTC2019-Spring). IEEE (IEEE vehicular technology conference proceedings). Available at: 10.1109/vtcspring.2019.8746485.

published journal article

A real-time algorithm to solve the peer-to-peer ride-matching problem in a flexible ridesharing system

Transportation Research Part B: Methodological

Publication Date

December 1, 2017
Suggested Citation
Neda Masoud and R. Jayakrishnan (2017) “A real-time algorithm to solve the peer-to-peer ride-matching problem in a flexible ridesharing system”, Transportation Research Part B: Methodological, 106, pp. 218–236. Available at: 10.1016/j.trb.2017.10.006.

conference paper

A Bayesian mixture model for estimating freeway travel time distributions using small probe samples from multiple days

Proceedings of TRB 89th annual meeting, washington DC

Publication Date

January 1, 2008
Suggested Citation
K Jintanakul, L Chu and R Jayakrishnan (2008) “A Bayesian mixture model for estimating freeway travel time distributions using small probe samples from multiple days”, in Proceedings of TRB 89th annual meeting, washington DC.

conference paper

Study of a Dynamic Cooperative Trading Queue Routing Control Scheme for Freeways and Facilities with Parallel Queues

Proceedings of the 97th annual meeting of the transportation research board

Publication Date

January 1, 2018

Abstract

This article explores the coalitional stability of a new cooperative control policy for freeways and parallel queuing facilities with multiple servers. Based on predicted future delays per queue or lane, a VOT-heterogeneous population of agents can agree to switch lanes or queues and transfer payments to each other in order to minimize the total cost of the incoming platoon. The strategic interaction is captured by an n-level Stackelberg model with coalitions, while the cooperative structure is formulated as a partition function game (PFG). The stability concept explored is the strong-core for PFGs which we found appropiate given the nature of the problem. This concept ensures that the efficient allocation is individually rational and coalitionally stable. We analyze this control mechanism for two settings: a static vertical queue and a dynamic horizontal queue. For the former, we first characterize the properties of the underlying cooperative game. Our simulation results suggest that the setting is always strong-core stable. For the latter, we propose a new relaxation program for the strong-core concept. Our simulation results on a freeway bottleneck with constant outflow using Newell’s car-following model show the imputations to be generally strong-core stable and the coalitional instabilities to remain small with regard to users’ costs.

Suggested Citation
Roger Lloret-Batlle and R. Jayakrishnan (2018) “Study of a Dynamic Cooperative Trading Queue Routing Control Scheme for Freeways and Facilities with Parallel Queues”, in Proceedings of the 97th annual meeting of the transportation research board. arXiv, p. 6p. Available at: 10.48550/ARXIV.1803.01265.

published journal article

Association between Airport Ultrafine Particles and Lung Cancer Risk: The Multiethnic Cohort Study

Cancer Epidemiology, Biomarkers & Prevention

Publication Date

May 1, 2024

Author(s)

Arthur Bookstein, Justine Po, Chiuchen Tseng, Timothy V. Larson, Juan Yang, Sung-shim L. Park, Jun Wu, Salma Shariff-Marco, Pushkar P. Inamdar, Ugonna Ihenacho, Veronica W. Setiawan, Mindy C. DeRouen, Loïc Le Marchand, Daniel O. Stram, Jonathan Samet, Beate Ritz, Scott Fruin, Anna H. Wu, Iona Cheng

Abstract

Ultrafine particles (UFP) are unregulated air pollutants abundant in aviation exhaust. Emerging evidence suggests that UFPs may impact lung health due to their high surface area-to-mass ratio and deep penetration into airways. This study aimed to assess long-term exposure to airport-related UFPs and lung cancer incidence in a multiethnic population in Los Angeles County.Within the California Multiethnic Cohort, we examined the association between long-term exposure to airport-related UFPs and lung cancer incidence. Multivariable Cox proportional hazards regression models were used to estimate the effect of UFP exposure on lung cancer incidence. Subgroup analyses by demographics, histology and smoking status were conducted.Airport-related UFP exposure was not associated with lung cancer risk [per one IGR HR, 1.01; 95% confidence interval (CI), 0.97–1.05] overall and across race/ethnicity. A suggestive positive association was observed between a one IQR increase in UFP exposure and lung squamous cell carcinoma (SCC) risk (HR, 1.08; 95% CI, 1.00–1.17) with a Phet for histology = 0.05. Positive associations were observed in 5-year lag analysis for SCC (HR, 1.12; 95% CI, CI, 1.02–1.22) and large cell carcinoma risk (HR, 1.23; 95% CI, 1.01–1.49) with a Phet for histology = 0.01.This large prospective cohort analysis suggests a potential association between airport-related UFP exposure and specific lung histologies. The findings align with research indicating that UFPs found in aviation exhaust may induce inflammatory and oxidative injury leading to SCC.These results highlight the potential role of airport-related UFP exposure in the development of lung SCC.

Suggested Citation
Arthur Bookstein, Justine Po, Chiuchen Tseng, Timothy V. Larson, Juan Yang, Sung-shim L. Park, Jun Wu, Salma Shariff-Marco, Pushkar P. Inamdar, Ugonna Ihenacho, Veronica W. Setiawan, Mindy C. DeRouen, Loïc Le Marchand, Daniel O. Stram, Jonathan Samet, Beate Ritz, Scott Fruin, Anna H. Wu and Iona Cheng (2024) “Association between Airport Ultrafine Particles and Lung Cancer Risk: The Multiethnic Cohort Study”, Cancer Epidemiology, Biomarkers & Prevention, 33(5), pp. 703–711. Available at: 10.1158/1055-9965.EPI-23-0924.

published journal article

Subprime mortgages and the housing bubble

Journal of Urban Economics

Publication Date

March 1, 2012

Author(s)

Jan Brueckner, Paul S. Calem, Leonard I. Nakamura

Abstract

This paper explores the link between the house-price expectations of mortgage lenders and the extent of subprime lending. It argues that bubble conditions in the housing market are likely to spur subprime lending, with favorable price expectations easing the default concerns of lenders and thus increasing their willingness to extend loans to risky borrowers. Since the demand created by subprime lending feeds back onto house prices, such lending also helps to fuel an emerging housing bubble. These ideas are illustrated in a theoretical model, and tentative support is found in empirical work exploring the connection between price expectations and the extent of subprime lending. (C) 2011 Elsevier Inc. All rights reserved.

Suggested Citation
Jan K. Brueckner, Paul S. Calem and Leonard I. Nakamura (2012) “Subprime mortgages and the housing bubble”, Journal of Urban Economics, 71(2), pp. 230–243. Available at: 10.1016/j.jue.2011.09.002.

working paper

Court Intervention, the Consent Decree and the Century Freeway

Publication Date

August 1, 1991

Author(s)

Joseph Dimento, Jace Baker, Robert Detlefson, Dru van Hengel, Brenda Nordenstam

Working Paper

UCI-ITS-WP-91-9, UCTC 381

Abstract

In 1972, a lawsuit. Keith v, Volpe. stopped implementation of the Century Freeway project and resulted in an injunction. By that time approximately 18,000 people had been displaced from the Century Freeway corridor. By the terms of the lawsuit, the then Division of Highways was required to develop a formal environmental impact statement on the entire Century Freeway project and to carry our additional public hearings. In 1979 parties to the lawsuit entered into a consent decree, amended two years later, which laid out the terms under which-the project would go forward. This injunction and consent decree were employed during a period of considerable regulatory and social change which nationwide was affecting the completion of public works projects, highways in particular. The period of the Century Freeway’s early years has been called the time of the freeway revolution. Whatever it is labelled, it provided a context for interpretation of and response to the Century Freeway lawsuit and consent decree. The context involved: – legal changes (environmental, transportation and housing law enactments, enhanced access to judicial review of administrative agency actions, codification of the gains of the civil rights movement); – social changes (increasing environmental awareness, the public interest law movement, demands for greater participation in the workplace by women and minorities); – economic and political changes (adoption of a federal Urban Initiatives Program, changing leadership at Caltrans, decreased gasoline tax revenues because of the Arab oil embargo and the use of fuel-efficient vehicles). This report presents the results of a two year study of the Century Freeway undertaken under a Research Technical Agreement between UCI and Caltrans.

Suggested Citation
Joseph F. DiMento, Jace Baker, Robert Detlefson, Dru van Hengel and Brenda Nordenstam (1991) Court Intervention, the Consent Decree and the Century Freeway. Working Paper UCI-ITS-WP-91-9, UCTC 381. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/9qj0m7w5.

published journal article

TileChain: A Blockchain-Based Framework for Security Service Management For Vehicular Communications

IEEE Transactions on Vehicular Technology

Publication Date

January 1, 2024

Author(s)

Ahmed Didouh, Anthony Bahadir Lopez, Houda Labiod, Yassin El Hillali, Atika Rivenq, Mohammad Al Faruque

Abstract

Vehicular communications have become essential for functional and road safety purposes due to the development of vehicle fleets. However, these communications have made vehicles more vulnerable to cyber-attacks. The security of data exchanges in vehicular networks currently relies on a centralized architecture that is responsible for managing various security services such as authentication, confidentiality, non-repudiation, real-time misbehavior detection, certificate management and revocation. However, this centralized approach can be challenging and costly for authorities, and it may even weaken the network’s overall security. In this paper, we propose a complementary solution that uses a decentralized security framework to help authorities better manage their network security by involving each vehicle in the overall security management. Our framework, TileChain, is blockchain based solution that use road information to manage the network’s security dynamically. The architecture is designed to optimize any security service efficiently. To demonstrate the feasibility and performance of our proposed solution, we selected certificate revocation as a critical service and performed simulations using real vehicle traffic data provided by The French road operator DIR Nord. Our Smart Contract achieved an accuracy of 81.3% in misbehavior detection, leading to certificate revocation. Furthermore, the computation load for security management by authorities potentially reduced by a factor of 96.8%. In summary, our proposed solution, TileChain, offers a promising decentralized approach for managing vehicular network security that can potentially improve the overall security of the network while reducing the computational burden on authorities.

Suggested Citation
Ahmed Didouh, Anthony Bahadir Lopez, Houda Labiod, Yassin El Hillali, Atika Rivenq and Mohammad Abdullah Al Faruque (2024) “TileChain: A Blockchain-Based Framework for Security Service Management For Vehicular Communications”, IEEE Transactions on Vehicular Technology, pp. 1–17. Available at: 10.1109/TVT.2024.3358784.