book/book chapter
Archives: Research Products
Phd Dissertation
Use of vehicle signature analysis and lexicographic optimization for vehicle reidentification on freeways
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Abstract
This dissertation presents the vehicle reidentification problem formulated as a lexicographic optimization problem. The lexicographic optimization formulation is a preemptive multi-objective formulation that combines goal programming, classification, and Bayesian analysis techniques. The details of field implementation and data collection design are also presented. The solution of the vehicle reidentification problem has the potential to yield reliable section measures such as travel times and densities, and enables the measurement of specific dynamic origin/destination demands as well as the development of new algorithms for ATMIS (Advanced Transportation Management and Information Systems) implementations of the approach using conventional surveillance infrastructure. Freeway inductive loop data from SR-24 in Lafayette, California, demonstrates that robust results can be obtained under different traffic flow conditions. A discussion is also presented of the application of section densities in a dynamic origin/destination demand estimation framework as an example of the usefulness of this approach. The use of existing surveillance infrastructure coupled with this approach could allow development of widespread applications in Intelligent Transportation Systems (ITS).
Suggested Citation
Carlos Sun (1998) Use of vehicle signature analysis and lexicographic optimization for vehicle reidentification on freeways. PhD Dissertation. UC Irvine. Available at: https://uci.primo.exlibrisgroup.com/permalink/01CDL_IRV_INST/1go3t9q/alma991035092964804701.published journal article
A cross-sectional survey of factors related to inpatient assault of staff in a forensic psychiatric hospital
Journal of advanced nursing
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Erin L. Kelly, Andrew M. Subica, Anthony Fulginiti, John S. Brekke and Raymond W. Novaco (2014) “A cross-sectional survey of factors related to inpatient assault of staff in a forensic psychiatric hospital”, Journal of advanced nursing, 71(5), pp. 1110–1122. Available at: 10.1111/jan.12609.Preprint Journal Article
Tackling the Crowdsourced Delivery Problem at Scale through a Set-Partitioning Formulation and Novel Decomposition Heuristic
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This paper presents a set-partitioning formulation and a novel decomposition heuristic (D-H) solution algorithm to solve large-scale instances of the urban crowdsourced shared-trip package delivery problem. The D-H begins by dividing the packages between shared personal vehicles (SPVs) and dedicated vehicles (DVs). For package-assignment to SPVs, this paper enumerates the set of routes each SPV can traverse and constructs a package-SPV route assignment problem. For package-assignment to DVs and routing, the paper first obtains DV routes by solving a conventional vehicle routing problem and then seeks potential solution improvements by switching packages from SPVs to DVs. The switching process is cost driven. The D-H significantly outperforms a commercial solver in terms of computational efficiency, while obtaining near-optimal solutions for small problem instances. This paper presents a city-scale case study to analyze the important service design factors that impact the efficiency of crowdsourced shared-trip delivery. The paper further analyzes the impact of three important service design factors on system performance, namely (i) the number of participating SPVs, (ii) the maximum detour willingness of SPVs, and (iii) the depot locations. The results and findings provide meaningful insights for industry practice, while the algorithms illustrate promise for large real-world systems.
Suggested Citation
Dingtong Yang, Michael F. Hyland and R. Jayakrishnan (2022) “Tackling the Crowdsourced Delivery Problem at Scale through a Set-Partitioning Formulation and Novel Decomposition Heuristic”. arXiv. Available at: 10.48550/arXiv.2203.14719.research report
Online Freeway Corridor Deployment of Anonymous Vehicle Tracking for Real Time Traffic Performance
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Research Report
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The need for advanced, accurate and comprehensive traffic performance measures in increasingly saturated traffic networks is stretching the effectiveness of existing conventional point-based loop detector traffic data. This study had two objectives. The first was the evaluation of two emerging technologies – Sensys Magnetometers and Blade Inductive Signature System – to assess their potential in providing advanced traffic performance measures using vehicle signature data. The second was the expansion and deployment of the Real-time Traffic Performance Measurement System (RTPMS) to provide section-based traffic performance measures under actual operating conditions. As a part of this deployment, a communications framework was implemented to provide real-time communications of signature feature data between field units and a central vehicle re-identification server. A new improved online interactive web-user interface was also developed to provide users with real-time as well as historical traffic performance measurements.
Suggested Citation
Stephen G. Ritchie, Andre Tok, Shin-Ting Jeng, Hang Liu, Sarah V. Hernandez and Jin Heoun Choi (2010) Online Freeway Corridor Deployment of Anonymous Vehicle Tracking for Real Time Traffic Performance. Research Report CA11-1226, UCI-0279. ITS-Irvine. Available at: https://dot.ca.gov/-/media/dot-media/programs/research-innovation-system-information/documents/f0017265-final-report-task-0686.pdf.Phd Dissertation
Transportation Noise Impacts on Residential Property Values in Los Angeles County: A Spatial Hedonic Analysis
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As population densities in urban areas increase, the associated demand on transportation infrastructure continues to exacerbate impacts on surrounding communities. These demands create a number of socioeconomic burdens including housing price impacts when communities are regularly exposed to excessive noise levels. Although noise impacts are not as commonly recognized or assessed in comparison to other environmental issues such as air, ground, or water pollution, it has been well documented in the literature that a wide range of health issues exist when communities are exposed to noise from transportation infrastructure. From a research perspective, the correlation of these health issues to the presence of impactful noise is difficult to quantify, as noise is subjective and requires translation into varying degrees of annoyance to deem it as detrimental from both health and economic perspectives. This dissertation utilizes spatial hedonic price (HP) models to estimate individuals’ marginal willingness-to-pay (MWTP) to reside in noise-impacted areas. These MWTP values can then be used to both valuate economic impacts and as a noise annoyance level proxy to identify zones that are at-risk due to excessive transportation noise exposure.The first analysis in this dissertation reviews salient transportation noise-related papers that have been published since Navrud’s comprehensive 2002 transportation noise literature review. In a review of recent literature, this dissertation found that transportation noise research has evolved to include advanced Geographic Information System data, and leverages increasingly powerful processors and statistical analysis programs. In addition, although significant transportation noise research has been conducted in Europe following EU Environmental Noise Directive 2002/49/EC, a relatively minimal number of studies have been conducted in the United States — especially in Southern California, revealing a research gap that this dissertation helps to address.The second analysis investigates the impacts of aircraft operations around Los Angeles International Airport. Using a subset of 2010-2014 single-family home sales data from the Los Angeles County Office of the Assessor (LACOA), HP spatial autoregressive models with autoregressive disturbances (SARAR) were estimated. The study hypothesizes and confirms that a negative impact value would be observed for homes being located within noise-mapped zones around the airport, along with an improvement in estimation values compared to previous fixed spatial effects ordinary least squares techniques.The third analysis in this dissertation investigates two important topics. First, it hypothesizes negative home value impacts from nearby freight rail operations in the densely populated South Bay region of Los Angeles County. Noise from freight rail lines is analyzed using an HP SARAR model and confirm negative valuation impacts to homes located near these rail lines. Second, it hypothesizes that by using a subset of the master LACOA dataset above, varying levels of spatial homogeneity can be comparatively analyzed between two samples that use similar data and modeling techniques. Results indicate that when neighboring zones have distinct differences in jurisdiction, fixed spatial effect delineations remain statistically significant. However, when neighboring zones have similar jurisdictional or demographic characteristics, spatial model parameters are able to account for fixed delineations.
Suggested Citation
Kaoru Todd Matsubara (2022) Transportation Noise Impacts on Residential Property Values in Los Angeles County: A Spatial Hedonic Analysis. Ph.D.. UC Irvine. Available at: https://uci.primo.exlibrisgroup.com/permalink/01CDL_IRV_INST/u4evf/cdi_proquest_journals_2689000905 (Accessed: October 12, 2023).published journal article
NONPROFIT LED NEOLIBERAL GROWTH MACHINES AND THE PRIVATIZATION OF COMMUNITY ENGAGEMENT: the obama presidential center on chicago’s south side
International Journal of Urban and Regional Research
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Abstract We analyze the development of the Obama Presidential Center in Chicago as the product of a new kind of urban growth machine—a nonprofit‐led neoliberal growth machine. Building on studies of nonprofit‐led urban development as well as research on CBA‐driven opposition, we reconstruct how an Obama Foundation‐led growth machine was able to dominate pre‐development planning, privatize public parkland and mount its own private community engagement process in ways that stymied powerful community opposition. We contend that the political resources of nonprofit foundations, especially their ability to claim a mantle of public authority and legitimacy, equip them to bypass genuinely public institutional processes and to repel even strong resistance from community actors. We argue that the array of soft political resources marshaled by the Obama Foundation—its perceived neutrality, collaborative reputation and public/private ambiguity—lend valuable assets to the task of bending participatory processes toward the political legitimation of controversial development projects. Because nonprofits are uniquely situated to deploy these political resources, the case of the OPC portends an expanding repertoire of action for growth machine actors, including the privatization of community engagement.
Suggested Citation
Virginia Parks, William Sites and Tadeo Weiner Davis (2025) “NONPROFIT LED NEOLIBERAL GROWTH MACHINES AND THE PRIVATIZATION OF COMMUNITY ENGAGEMENT: the obama presidential center on chicago’s south side”, International Journal of Urban and Regional Research, 49(6), pp. 1417–1436. Available at: 10.1111/1468-2427.13350.conference paper
Metrics for Quantifying Shareability in Transportation Networks: The Maximum Network Flow Overlap Problem
102nd Transportation Research Board Annual Meeting 2023
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Navjyoth Sarma and Michael Hyland (2023) “Metrics for Quantifying Shareability in Transportation Networks: The Maximum Network Flow Overlap Problem”. 102nd Transportation Research Board Annual Meeting 2023.published journal article
How concentrated disadvantage moderates the built environment and crime relationship on street segments in Los Angeles
Criminology & Criminal Justice
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Criminological theories have posited that the built environment impacts where crime occurs; however, measuring the built environment is difficult. Furthermore, it is uncertain whether the built environment differentially impacts crime in high-disadvantage neighborhoods. This study extracts features of the built environment from Google Street View images with a machine learning semantic segmentation strategy to create measures of fences, walls, buildings, and greenspace for over 66,000 street segments in Los Angeles. Results indicate that the presence of more buildings on a segment was associated with higher crime rates and had a particularly strong positive relationship with robbery and motor vehicle theft in low-disadvantage neighborhoods. Notably, fences and walls exhibited different relationships with crime. Walls, which do not allow visibility, were strongly negatively related to crime, particularly for robbery and burglary in high-disadvantage neighborhoods. Fences, which allow visibility, were associated with fewer robberies and larcenies, but more burglaries and aggravated assaults. Fences only exhibited a negative relationship with violent crime when they were located in low-disadvantage neighborhoods. The results highlight the importance of accounting for the built environment and the surrounding level of disadvantage when exploring the micro-location of crime.
Suggested Citation
John R Hipp, Sugie Lee, Dong Hwan Ki and Jae Hong Kim (2022) “How concentrated disadvantage moderates the built environment and crime relationship on street segments in Los Angeles”, Criminology & Criminal Justice, p. 17488958221132764. Available at: 10.1177/17488958221132764.working paper
Prices, capacities and service quality in a congestible Bertrand duopoly
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We study the duopolistic interaction between congestible facilities that supply perfect substitutes. Firms are assumed to make sequential decisions on capacities and prices. Since the outcomes directly affect consumers’ time cost of accessing or using a facility, the capacity sharing rule is endogenous. We study this two-stage game for different firm objectives and compare the duopoly outcomes with those under monopoly and at the social optimum. Our findings include the following. First, for profit maximizing firms both capacity provision and service quality, defined as the inverse of time costs of using the facility, are distorted under duopoly: they are below the socially optimal levels. This contrasts with the monopoly outcome, where pricing and capacity provision are such that the monopolist does provide the socially optimal level of service quality. Second, duopoly prices are lower than monopoly prices, but higher than in the social optimum. Hence, while price competition between duopolists yields benefits for consumer, capacity competition is harmful. Third, price-capacity competition implies that higher capacity costs may lead to higher profits for both facilities. Finally, if firms also care about output, this mainly affects pricing behavior; strategic interaction in capacities are much less affected. If duopolists attach a higher weight to output and a correspondingly lower weight to profits, this leads to a deterioration of the quality of service.