published journal article

Flight Procedural Noise Assessment of Blended-Wing–Body Aircraft with Variable Thrust

Journal of Aircraft

Publication Date

February 6, 2025

Author(s)

Victoria Pellerito, Mallory Mott, Naomi Acosta, Jacqueline (Jacquie) Huynh, Jack Ahrens, Franco Staub, Judy Gallman, John Vassberg

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Abstract

Today’s commercial aviation industry centers on the tube-and-wing aircraft configuration with underwing-mounted engines, possibly nearing convergence on optimal performance capabilities with acceptable community noise. A potentially feasible breakthrough for obtaining lower noise levels for commercial aviation is the blended-wing–body (BWB), which presents unique noise-reducing characteristics such as engine shielding and simplified high-lift devices. The significance of characteristics unique to BWBs on overall aircraft noise is assessed through a study of a BWB aircraft design representative of the JetZero vehicle. This paper presents a methodology capable of modeling the aircraft’s propulsion system and corresponding performance capabilities necessary to assess the vehicle noise sources and overall community noise impact. Analysis of Part 36 certification noise levels indicates that the vehicle’s margin to Stage 5 standards is 35.8 effective perceived noise level (in EPNdB), and an additional 2.0 EPNdB is achievable with a decreased maximum takeoff thrust engine variant. Community noise impacts of departure and arrival procedures are studied through comparison of single-event noise contours. Significant contour area reductions were observed when compared to conventional tube-and-wing aircraft of similar weight and range class. Further departure and approach noise reductions were modeled through additional full-flight procedure variations.

Suggested Citation

Victoria Pellerito, Mallory Mott, Naomi Acosta, Jacqueline Huynh, Jack Ahrens, Franco Staub, Judy Gallman and John Vassberg (2025) “Flight Procedural Noise Assessment of Blended-Wing–Body Aircraft with Variable Thrust”, Journal of Aircraft, pp. 1–12. Available at: 10.2514/1.C037984.

conference paper

Performance of artificial neural networks for incident detection in ITS

TRANSPORTATION CONGRESS: CIVIL ENGINEERS - KEY TO THE WORLD'S INFRASTRUCTURE, PROCEEDINGS OF THE 1995 CONFERENCE, VOLS 1 AND 2

Publication Date

January 1, 1995

Author(s)

Baher Abdulhai, Stephen Ritchie

Suggested Citation

B Abdulhai and SG Ritchie (1995) “Performance of artificial neural networks for incident detection in ITS”, in . Lall, BK and Jones, DL (ed.) TRANSPORTATION CONGRESS: CIVIL ENGINEERS - KEY TO THE WORLD'S INFRASTRUCTURE, PROCEEDINGS OF THE 1995 CONFERENCE, VOLS 1 AND 2. AMER SOC CIVIL ENGINEERS, pp. 227–238.

working paper

The Built Environment as a Determinant of Walking Behavior: Analyzing Non-Work Pedestrian Travel in Portland, Oregon

Publication Date

July 1, 2001

Author(s)

Mike Greenwald, Marlon Boarnet

Working Paper

UCI-ITS-WP-01-9, UCI-ITS-AS-WP-01-4

Areas of Expertise

Public Transit, Shared Mobility, & Active Transportation Travel Behavior, Land Use, & the Built Environment

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Abstract

Much has been written about the connection between land use/urban form and transportation from the perspective of impacting automobile trip generation. This only addresses half the issue. The theoretical advances in land use/transportation relationships embodied in paradigms such as the jobs housing balance, neo-traditional design (NTD) standards and transit oriented development (TOD) rely very heavily on the generation of pedestrian traffic in order to realize their proposed benefits. The analysis presented here employs similar models and data sets used in Boarnet & Greenwald for the Portland, Oregon area, but applies them towards analysis of non-work walking travel. The results suggest that whatever effects land use has on affecting individual non-work walking trip generation, the impacts take place at the neighborhood level.

Suggested Citation

Michael J. Greenwald and Marlon G. Boarnet (2001) The Built Environment as a Determinant of Walking Behavior: Analyzing Non-Work Pedestrian Travel in Portland, Oregon. Working Paper UCI-ITS-WP-01-9, UCI-ITS-AS-WP-01-4. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/9gn7265f.

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

Publication Date

November 1, 2025

Author(s)

Virginia Parks, William Sites, Tadeo Weiner Davis

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Abstract

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

Publication Date

January 1, 2023

Author(s)

Navjyoth Sarma, Michael Hyland

Suggested Citation

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.

Conference Paper: Performance of artificial neural networks for incident detection in ITS

published journal article

The role of renter burden and affordable units at risk in city-level housing inadequacy

Cities

Publication Date

October 1, 2025

Author(s)

John R. Hipp, Brendan S. Poon, Jae Hong Kim

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Abstract

While substantial research has studied the effects of government-assisted provision of affordable housing units, little is known about the challenges that arise when the stock of affordable units is increasingly at risk due to the approaching expiration of their low-cost status. This study provides an empirical investigation of how city-level at-risk affordable units, as well as median rent and rent burden, relate to housing inadequacy using data for all cities with population greater than 5000 in the U.S. The results indicate a direct positive relationship between rent burden (relative to income) and housing inadequacy in multilevel models accounting for the county context of these cities. This positive relationship is strongest in counties with large population or high average income. Cities with higher (nominal) median rent have less housing inadequacy, particularly in counties with larger populations. Finally, the presence of more affordable units, as well as more at-risk affordable units, is associated with greater housing inadequacy, calling for more attention not only to the expansion of these units but also to the ways affordable housing stock is managed and preserved. Our findings indicate the importance of policies to reduce both rent burdens and the presence of at-risk units, such as proactive renewal of affordability covenants. Moreover, our findings highlight the need for additional research that addresses how renters and developers respond to incentives created by affordable housing dynamics.

Suggested Citation

John R. Hipp, Brendan S. Poon and Jae Hong Kim (2025) “The role of renter burden and affordable units at risk in city-level housing inadequacy”, Cities, 165, p. 106086. Available at: 10.1016/j.cities.2025.106086.

research report

Analysis of Activity-travel Patterns and Tour Formation of Transit Users [Research Brief]

Publication Date

April 1, 2021

Author(s)

Michael McNally, Rezwana Rafiq

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Abstract

The complexity of travel behavior has evolved as travelers respond to varying activity demands and the changing supply environment, measured by congestion, cost, and emerging technologies. Complexity in travel behavior is often manifested by an increasing tendency to chain several activities within a tour to minimize total travel time and the number of trips, leading travelers to seek more flexible travel modes to complete their complex travel demands.

Suggested Citation

Michael G McNally and Rezwana Rafiq (2021) Analysis of Activity-travel Patterns and Tour Formation of Transit Users [Research Brief]. researchBrief. Available at: https://rosap.ntl.bts.gov/view/dot/67954 (Accessed: October 11, 2023).

conference paper

Performance studies of a network adaptive traffic control algorithm via simulation model

ITSC 2001. 2001 IEEE intelligent transportation systems. Proceedings (cat. No.01TH8585)

Publication Date

January 1, 2001

Author(s)

Wann-Ming Wey, R. (Jay) Jayakrishnan

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Suggested Citation

Wann-Ming Wey and R. Jayakrishnan (2001) “Performance studies of a network adaptive traffic control algorithm via simulation model”, in ITSC 2001. 2001 IEEE intelligent transportation systems. Proceedings (cat. No.01TH8585). IEEE, pp. 663–668. Available at: 10.1109/itsc.2001.948739.

conference paper

A distributed approach to network-wide traffic control management

Applications of advanced technologies in transportation

Publication Date

January 1, 1998

Author(s)

Filippo Logi, Stephen Ritchie

Abstract

This paper presents a distributed architecture for area-wide incident response and traffic control management, composed of two interacting, real-time decision-support systems that are able to perform cooperative reasoning and to resolve conflicts. The two units exchange partial and potentially incomplete results during the execution of their problem-solving tasks and exploit inter-agent constraints to resolve inconsistencies that are due to the limitations of their information, in order to integrate local solutions into global, network-wide control plans. Reflecting the complexity of the interaction between the various agencies engaged in the management and control of urban networks, this approach takes into account the desire of each individual agency to preserve its autonomy and maintain the control of the facilities under its jurisdiction, but at the same time tries to exploit their willingness to cooperate and unify their problem-solving capabilities towards a conflict-free, integrated response to operational problems.

Suggested Citation

F Logi and SG Ritchie (1998) “A distributed approach to network-wide traffic control management”, in . Hendrickson, CT and Ritchie, SG (ed.) Applications of advanced technologies in transportation. AMER SOC CIVIL ENGINEERS, pp. 83–90.