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Quantifying Access Disparities in Response Plans

Description: This article develops and explores data driven methods to quantify vulnerabilities in the context of response plans, addressing limitations on the availability, granularity, and currency of data to identify vulnerable populations.
Date: January 15, 2016
Creator: Indrakanti, Saratchandra; Mikler, Armin R.; O'Neil II, Martin & Tiwari, Chetan
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Cascading effects of COVID-19 on population mobility and air quality: An exploration including place characteristics using geovisualization

Description: Article examining the population mobility and air quality before and after the lockdown (mandated restriction of activity) during the public health response to COVID-19. This article is part of the Special Issue on COVID-19.
Date: January 22, 2022
Creator: Atkinson, Samuel F.; Kala, Abhishek K. & Tiwari, Chetan
Item Type: Refine your search to only Article
Partner: UNT College of Science
open access

Evaluating spatial patterns of seasonal ozone exposure and incidence of respiratory emergency room visits in Dallas-Fort Worth

Description: This article examines the relationships between spatial patterns of long-term ozone exposure and respiratory illness within Dallas-Fort Worth to better understand impacts on health outcomes.
Date: April 13, 2021
Creator: Northeim, Kari; Marks, Constant & Tiwari, Chetan
Item Type: Refine your search to only Article
Partner: University of North Texas
open access

A Comparison of Least Squares Regression and Geographically Weighted Regression Modeling of West Nile Virus Risk Based on Environmental Parameters

Description: This article discusses the effectiveness of utilizing local spatial variations in environmental data to uncover the statistical relationships between West Nile Virus (WNV) risk and environmental factors.
Date: March 28, 2017
Creator: Kala, Abhishek K.; Tiwari, Chetan; Mikler, Armin R. & Atkinson, Samuel F.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
open access

Sustainable nutrition: a spatially explicit modeling approach for urban land use planning

Description: Article describes how rapid urbanization has influenced the transformation of local and global food systems, altering the availability, access to, and distribution of healthy food. Micronutrient deficiency and hunger have been exacerbated worldwide. The author's research proposes a simulation strategy to evaluate the impact of agricultural land use and crop choices on nutritional production in rapidly growing urban areas.
Date: October 14, 2022
Creator: Torres, Angélica Torres; Tiwari, Chetan & Atkinson, Samuel F.
Item Type: Refine your search to only Article
Partner: UNT College of Science
open access

Sustaining Human Nutrition in an Increasingly Urban World

Description: This article proposes an urban nutrition (UN) extension to the previously published urban ecological economic system. The proposed extension can be used by decision makers worldwide to evaluate how landscape configurations and agricultural production systems affect the nutritional needs of the local population while fostering sustainable practices.
Date: June 22, 2022
Creator: Torres, Angélica Valencia; Tiwari, Chetan & Atkinson, Samuel F.
Item Type: Refine your search to only Article
Partner: UNT College of Science
open access

Hybrid Optimization Models for Depot Location-Allocation and Real-Time Routing of Emergency Deliveries

Description: Prompt and efficient intervention is vital in reducing casualty figures during epidemic outbreaks, disasters, sudden civil strife or terrorism attacks. This can only be achieved if there is a fit-for-purpose and location-specific emergency response plan in place, incorporating geographical, time and vehicular capacity constraints. In this research, a comprehensive emergency response model for situations of uncertainties (in locations' demand and available resources), typically obtainable in lo… more
Date: May 2021
Creator: Akwafuo, Sampson E
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Building a Vegan Community of Practice: An Outreach Analysis for Vegan Society of PEACE, Houston, Texas

Description: This research is focused on a group of vegan and vegan-curious individuals who are creating, building and maintaining a vegan community of practice in Houston, Texas. Through ethnographic methods, including participant observation, in-depth semi-structured interviews, surveys, quantitative analysis, and use of geographic information systems (GIS), this thesis considers motivations, group hierarchies, core and peripheral membership, practices, beliefs and construction of identity within the vega… more
Date: August 2021
Creator: McRae, Susan Elizabeth
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Behind the Curtain of Public Spaces: Revealing the Narratives of Corporate Street Hawking in Globalizing Accra

Description: All street hawkers are not the same in many Newly Industrialized Countries (NICs) of the global south as often portrayed by the media and documented in extant literature. This perception has created a gap in knowledge as researchers explore street hawking activities in NICs. In this study, I investigated a new informality trend of street hawking is coming into being within the capital city of Accra, Ghana. As governance is increasingly becoming entrepreneurial, informal activities are gradually… more
Date: December 2021
Creator: Ansah, Hilary Ama
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Using Machine Learning to Develop a Calibration Model for Low-Cost Air Quality Sensors Deployed during a Dust Event

Description: Low-cost sensors have the potential to create dense air monitoring networks that help enhance our understanding of pollution exposure and variability at the individual and neighborhood-level; however, sensors can be easily influenced by environmental conditions, resulting in performance inconsistencies across monitoring settings. During summer 2020, 20 low-cost particulate sensors were deployed with a reference PM2.5 monitor in Denton, Texas in preparation for calibration. However, from mid to … more
Date: May 2021
Creator: Hickey, Sean
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Ozone Pollution Monitoring and Population Vulnerability in Dallas-Ft. Worth: A Decision Support Approach

Description: In urban environments, ozone air pollution, poses significant risks to respiratory health. Fixed site monitoring is the primary method of measuring ozone concentrations for health advisories and pollutant reduction, but the spatial scale may not reflect the current population distribution or its future growth. Moreover, formal methods for the placement of ozone monitoring sites within populations potentially omit important spatial criteria, producing monitoring locations that could unintention… more
Date: August 2021
Creator: Northeim, Kari M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Ecosystem Services and Sustainability: A Framework for Improving Decision-Making in Urban Areas

Description: Ecosystem services are the varied goods and benefits provided by ecosystems that make human life possible. This concept has fostered scientific explorations of the services that nature provides to people with the goal of sustaining those services for future generations. As the world becomes increasingly urban, ecosystems are reshaped, and services are degraded. Provisioning and regulating ecosystem services, landscape planning, decision making, and agricultural systems and technologies play a d… more
Date: May 2022
Creator: Valencia Torres, Angélica
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Investigating the Spatial Relationship between Suicide and Race/Ethnicity: The Case for Alternate Rate Adjustment Techniques in Medical Geography

Description: This work explores potential distortions created by race and ethnicity on the visualization, interpretation, and understanding of the spatial distribution of suicide in the United States. Due to radically different suicide rates among racial/ethnic groups, traditional crude or age-adjusted rates may introduce statistical confounding in both linear and spatial models. Using correlation, choropleth mapping, hot spot analysis, and location-allocation modeling, this work shows how traditional metho… more
Date: December 2022
Creator: Lester, Katherine Ann
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

An Evaluation of Long-Term Air Quality Trends in North Texas using Statistical and Machine Learning Techniques

Description: While ozone design values have decreased since 2000, the values measured in Denton Airport South (DEN), an exurban region in the northwest tip of the Dallas-Fort Worth (DFW) metroplex, remains above those measured in Dallas Hinton (DAL) and Fort Worth Northwest (FWNW), two extremely urbanized regions; in addition, all three sites remained in nonattainment of National Ambient Air Quality Standards (NAAQS) ozone despite reductions in measured NOx and CO concentrations. The region's inability to a… more
Date: May 2020
Creator: Lim, Guo Quan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Conducting Tick-Borne Disease Research in Texas with a Focus on Rickettsia spp.

Description: The field of vector-borne disease research uses multidisciplinary approaches to help understand complicated interactions. This dissertation, covers three different aspects of tick-borne disease research which all focus on exploring tick-borne diseases in the non-endemic areas of Denton, County Texas and the state of Texas with a focus on Rickettsia spp. These aspects include tick sampling, testing ticks for the presence of Rickettsia spp., and creating species distribution maps of the Rickettsi… more
Date: May 2020
Creator: Huddleston, Jody Sue
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

A Spatial Decision Support System to Dynamically Compute and Map Neighborhood Indices

Description: Neighborhoods are organic entities that are in a state of constant change and are driven by the specific context of the problem being investigated. The subsequent lack of consensus on a universal geographic definition for what constitutes a neighborhood can lead to biased interpretations of relationships between human activities and place. Further, while existing geographical information system software allows users to combine a range of geographic objects to generate regional units of analyses… more
Date: May 2020
Creator: Barnett, Melissa Marie
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Storm Water Retention Ponds: An Important Source of Aquatic Macroinvertebrate Diversity in a Semi-Arid Urban Landscape of Denton, Texas

Description: The City of Denton, located in a semi-arid region of Texas, has over 200 manmade ponds within its city limits. Many of these ponds, located in densely populated areas, are engineered to control storm water runoff. There is a general lack of recognition of the value these waters contribute to regional biodiversity and as greenspaces. This study, conducted in Denton, is monitoring habitat variables and macroinvertebrate diversity in a series of ponds selected to represent a gradient of urban in… more
Date: May 2020
Creator: Moore, Sabrina
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The Geography of Retail Clinics Post Implementation of the Affordable Care Act

Description: Retail clinics are walk-in clinics designed for convenience and for servicing minor health issues and certain acute conditions. The model began as a way of bringing both convenience and care to areas that have lower levels of access to primary care resources. With the implementation of Affordable Care Act (ACA) in March 2010, populations that were previously uninsured were now required to have access to some level of health insurance. These populations presented a potential new market for retai… more
Date: August 2019
Creator: Portillo, Ethan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Spatial Partitioning Algorithms for Solving Location-Allocation Problems

Description: This dissertation presents spatial partitioning algorithms to solve location-allocation problems. Location-allocations problems pertain to both the selection of facilities to serve demand at demand points and the assignment of demand points to the selected or known facilities. In the first part of this dissertation, we focus on the well known and well-researched location-allocation problem, the "p-median problem", which is a distance-based location-allocation problem that involves selection and… more
Date: December 2019
Creator: Gwalani, Harsha
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Irrigation Methods and Their Effects on Irrigation Water Efficiency in High Tunnels

Description: Improving water efficiency is and will continue to be a top concern to meet the world food production demands for a growing population. By having a clear understanding of water efficiencies, communities will be able to address these concerns from an economic standpoint and use more productive methods to grow food and limit water consumption. This study examines the water efficiencies of three irrigation methods over a single growing season in southeastern Oklahoma. Two crops, tomatoes and cucum… more
Date: December 2019
Creator: Young, Lauren
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Computational Methods to Optimize High-Consequence Variants of the Vehicle Routing Problem for Relief Networks in Humanitarian Logistics

Description: Optimization of relief networks in humanitarian logistics often exemplifies the need for solutions that are feasible given a hard constraint on time. For instance, the distribution of medical countermeasures immediately following a biological disaster event must be completed within a short time-frame. When these supplies are not distributed within the maximum time allowed, the severity of the disaster is quickly exacerbated. Therefore emergency response plans that fail to facilitate the transpo… more
Date: August 2018
Creator: Urbanovsky, Joshua C.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Automated Tree Crown Discrimination Using Three-Dimensional Shape Signatures Derived from LiDAR Point Clouds

Description: Discrimination of different tree crowns based on their 3D shapes is essential for a wide range of forestry applications, and, due to its complexity, is a significant challenge. This study presents a modified 3D shape descriptor for the perception of different tree crown shapes in discrete-return LiDAR point clouds. The proposed methodology comprises of five main components, including definition of a local coordinate system, learning salient points, generation of simulated LiDAR point clouds wit… more
Date: May 2018
Creator: Sadeghinaeenifard, Fariba
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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