DRUM - Digital Repository at the University of Maryland

DRUM collects, preserves, and provides public access to the scholarly output of the university. Faculty and researchers can upload research products for rapid dissemination, global visibility and impact, and long-term preservation.

Submit to DRUM

Submit to DRUM

To submit an item to DRUM, login using your UMD credentials. Then select the "Submit Item to DRUM" link in the navigation bar. View DRUM policies and submission guidelines.
Equitable Access Policy

Equitable Access Policy

The University of Maryland Equitable Access Policy provides equitable, open access to the University's research and scholarship. Faculty can learn more about what is covered by the policy and how to deposit on the policy website.
Theses and Dissertations

Theses and Dissertations

DRUM includes all UMD theses and dissertations from 2003 forward.

List of Communities

Collections Organized by Department

UM Community-managed Collections

Recent Submissions

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    Digital Twins in Intelligent Transportation and Communication Systems: A Survey
    (2026) Zhang, Zifan; Chen, Dianwei; Yang, Xianfeng; Mao, Shiwen; Liu, Yuchen
    Digital Twins (DTs) are reshaping Intelligent Transportation and Communication Systems (ITCS) by providing continuously synchronized, executable models of vehicles, infrastructure, and communication networks. This survey offers a unified taxonomy and explicitly defines six DT categories from design perspective: Single-Vehicle DT (SV-DT), a per-vehicle twin that mirrors dynamics, perception, planning, and control for inner-loop analysis of the vehicle; Connected Vehicle DT (CVDT), a fleet or multi-vehicle twin that coordinates interactions, cooperation, and resource sharing under communications; Environment DT (ENV-DT), a twin of roads, intersections, signals, and demand that supports monitoring, forecasting, and policy evaluation at corridor and system scales; Network DT (NET-DT), a communication twin that emulates V2X and backhaul state to assess latency, reliability, and capacity and to guide roadside unit placement; Safety and Security DT (SAFE-DT), a crosscutting twin for hazard analysis, incident detection, robustness, and cyber resilience; and finally, Twin of Twins (ToT), an orchestration layer that composes heterogeneous twins to deliver system-level services with consistency. This survey formalizes a comprehensive modular DT architecture in ITCS, including data paths, modeling fidelity, and system synchronization, and distinguishes DTs from simulators and digital shadows. Open challenges are also discussed along with future directions, with the goal of developing efficient and sustainable next-generation intelligent vehicular network systems.
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    Community Health Worker-Delivered Interventions for Perinatal Mental Health in the United States: A Scoping Review
    (Mary Ann Liebert, A Part of SAGE, 2026-03-28) McCormick, Anna Paden; Thoma, Marie E.; Mallick, Lindsay M.; Tchangalova, Nedelina; Dogbanya, Gabriel; Gourevitch, Rebecca A.; Mittal, Mona
    BACKGROUND: Maternal health in the United States is in crisis, and perinatal mental health conditions are emerging as a critical contributor to maternal morbidity and mortality. Perinatal mood and anxiety disorders (PMADs) encompass a range of mental health disorders experienced during pregnancy and 1 year after delivery. Expanding the perinatal mental health workforce to include paraprofessionals could help address a national shortage of mental health professionals. OBJECTIVE: This scoping review aims to investigate the literature on perinatal mental health interventions delivered by community health workers (CHWs) or paraprofessionals in the United States. METHODS: Studies on interventions addressing perinatal mental health were included if delivered by CHWs or paraprofessionals in the United States. Seven databases were searched via EBSCO through August 29, 2025. No publication year limits were applied. Results were exported to Zotero for deduplication, Catchii for screening, and Excel for data extraction and analysis. Risk of bias was not assessed. RESULTS: After removing 4148 duplicates from the 7524 records identified, 3376 records were screened, and 13 studies met the inclusion criteria. CHW-delivered interventions for PMADs in the United States varied in design, content, and implementation. Most were initiated during the antenatal period, extended postnatally, and targeted primary prevention of depression symptoms. Ten studies evaluated outcomes among predominantly low-income, Latina, or Black mothers in urban environments. Interventions enhanced social support, cognitive, emotional, behavioral, parenting, and practical skills. Intervention results varied. Most studies reported positive effects: all nonexperimental designs found statistically significant improvements in depressive symptoms, and many experimental designs demonstrated statistically significant improvements in depressive symptoms among women receiving adequate intervention dosage. CONCLUSIONS: This review expands knowledge of perinatal mental health interventions delivered by CHWs and health paraprofessionals in the United States, including information about populations served, CHWs, intervention characteristics, and outcomes. Gaps in evidence and recommendations for future research are presented.
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    Bridging Battlefield and Homefront: The Playboy Forum and the Vietnam War
    (2026) Shah, Diya; Keane, Katarina
    This paper examines Playboy magazine, specifically its editorial section “The Playboy Forum,” as an overlooked site of Vietnam War dialogue and publicvdebate. While Playboy is primarily remembered as a men’s entertainment magazine, I argue that the Forum section functioned as an interactive print space in which soldiers, veterans, civilians, and anyone worldwide with access to the magazine could share and debate their experiences, concerns, and opinions on numerous aspects of the war. Drawing on letters published in the Forum between 1968 and 1975, I show how the Forum allowed readers to challenge military authority, share information and legal resources, debate antiwar dissent and amnesty, and bring firsthand wartime experience into conversation with a broad civilian readership, ultimately sharing and exchanging perspectives in a manner no other mainstream publication of the era was able to do. This paper reconsiders Playboy as a participatory platform that helped bridge the divide between the battlefield and the home front. Within the paper, I also posit why “The Playboy Forum” and Playboy as a publication have gone largely unexamined in scholarship on the Vietnam War, and argue for the value of entertainment magazines as an important but underused source for understanding how Americans experienced and debated the Vietnam War.
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    The Evolution of Authoritarianism in Venezuela under the Chavista Regime
    (2025) Little, Liam; Brower, Jonathan
    This essay explores authoritarianism in Venezuela since Chavez’s rise to power. By examining differing views on the Chavez-Maduro regime, providing context for the rise of this government, as well as insights into both Chavez and Maduro, the people they represented, and the policies each of these presidents implemented. This essay then claims that the 1999 to 2002 era of the Chavez regime was a fragile democracy. Between 2002 and 2006 the Chavez government became a competitive authoritarian regime. Subsequently Chavez's government transitioned into authoritarianism from 2007 to 2009. Once Maduro became president in 2013 and had massive crackdowns on the opposition protest movement in 2014, the Maduro government became a military strongman authoritarian regime.
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    Building with Explosives: The Role of Dynamite in Constructing the Panama Canal
    (2025) Katz, Hershel; Greene, Julie
    My paper examines how technology, specifically dynamite, impacted the construction of the Panama Canal and what it meant for the labor force. I argue that the there is a deeper story than what is known about the canal's relationship to dynamite. The project's mass use of dynamite forced a better scientific understanding of explosives in general, as well as innovation and safety measures for efficiency. I also found primary sources of explosion incidents to show how dynamite served as a lens to understand the differing experiences of the labor force and the dangers of building the canal. Overall, the canal was an engineering phenomenon for the time, and also revealed a complex intersection between technology and labor history.