Browsing by Author "Bridgelall, Raj"
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Accuracy Enhancement of Anomaly Localization with Participatory Sensing Vehicles
Bridgelall, Raj; Tolliver, Denver D. (2020)Transportation agencies cannot afford to scale existing methods of roadway and railway condition monitoring to more frequently detect, localize, and fix anomalies throughout networks. Consequently, anomalies such as potholes ... -
Accuracy Enhancement of Roadway Anomaly Localization Using Connected Vehicles
Bridgelall, Raj; Tolliver, Denver D. (2016)The timely identification and localization of roadway anomalies that pose hazards to the traveling public is currently a critical but very expensive task. Hence, transportation agencies are evaluating emerging alternatives ... -
An Application of Natural Language Processing to Classify What Terrorists Say They Want
Bridgelall, Raj (2022)Knowing what perpetrators want can inform strategies to achieve safe, secure, and sustainable societies. To help advance the body of knowledge in counterterrorism, this research applied natural language processing and ... -
Applying Unsupervised Machine Learning to Counterterrorism
Bridgelall, Raj (2022)To advance the agenda in counterterrorism, this work demonstrates how analysts can combine unsupervised machine learning, exploratory data analysis, and statistical tests to discover features associated with different ... -
Attack Risk Modelling for the San Diego Maritime Facilities
Patterson, Douglas A.; Bridgelall, Raj (2020)California is the largest economy among states in the US. More than 40% of the nation's containerized cargo flows through the marine ports of California. Cruise ships also call on four of California's largest ports, with ... -
Budgeting the Adoption of Sensors on Connected Trains
Bridgelall, Raj; Tolliver, Denver D. (2021)Railroads can save millions of dollars by deploying multi-sensor track scanners on connected trains to detect track and roadbed problems that could cause accidents. However, uncertainties about performance and return-on-investment ... -
Calibration of Smartphone Sensors to Evaluate the Ride Quality of Paved and Unpaved Roads
Yang, Xinyi; Hu, Liuqing; Ahmed, Hafiz Usman; Bridgelall, Raj; Huang, Ying (2020)Transportation agencies report that millions of crashes are caused by poor road conditions every year, which makes the localization of roadway anomalies extremely important. Common methods of road condition evaluation ... -
Campus Parking Supply Impacts on Transportation Mode-Choice
Bridgelall, Raj (2014)Parking demand is a significant land-use problem in campus planning. The parking policies of universities and large corporations with facilities located in small urban areas shape the character of their campuses. These ... -
Characterizing Pavement Roughness at Non-Uniform Speeds Using Connected Vehicles
Bridgelall, Raj; Hough, Jill; Tolliver, Denver D. (2017)Methods of pavement roughness characterizations using connected vehicles are poised to scale beyond the frequency, span, and affordability of existing methods that require specially instrumented vehicles and skilled ... -
Characterizing Ride Quality With a Composite Roughness Index
Bridgelall, Raj (2022)There are many important applications that require ride quality characterization. However, the only international standard that specifies a roughness index is not suitable for applications beyond assessing the ride quality ... -
Closed Form Models to Assess Railroad Technology Investments
Bridgelall, Raj; Tolliver, Denver D. (2020)Class I railroads in North America collectively invested $11.2 billion to comply with a federal mandate to deploy positive train control. This amount dwarfs the potential savings from accidents the technology could prevent. ... -
A Cognitive Framework to Plan for the Future of Transportation
Bridgelall, Raj; Tolliver, Denver D. (2020)Automated, connected, electrified, and shared mobility will be cornerstones of the transportation future. Research to quantify the potential benefits and drawbacks of practice, and to identify barriers to adoption is the ... -
A Connected Vehicle Approach for Pavement Roughness Evaluation
Bridgelall, Raj (2014)Connected vehicles present an opportunity to monitor pavement condition continuously by analyzing data from vehicle-integrated position sensors and accelerometers. The current practice of characterizing and reporting ... -
Context Sensitive Solution: A Case Study of Northwest Highway White Rock Lake, Dallas in Texas
Bridgelall, Raj; Lee, EunSu (2015)Loop 12 is the first ring around the city of Dallas. The project is a three-quarter mile section of Loop 12 on Northwest Highway. The project section of Northwest Highway is a set of six bridges that cross a 100-year ... -
Data-Driven Deployment of Cargo Drones: A U.S. Case Study Identifying Key Markets and Routes
Bridgelall, Raj (2023)Electric and autonomous aircraft (EAA) are set to disrupt current cargo-shipping models. To maximize the benefits of this technology, investors and logistics managers need information on target commodities, service ... -
Detecting Sources of Ride Roughness by Ensemble Connected Vehicle Signals
Bridgelall, Raj; Bhardwaj, Bhavana; Lu, Pan; Tolliver, Denver D.; Dhingra, Neeraj (2022)It is expensive and impractical to scale existing methods of road condition monitoring for more frequent and network-wide coverage. Consequently, defects that increase ride roughness or can cause accidents will go undetected. ... -
Effects of smartphone sensor variability in road roughness evaluation
Ahmed, Hafiz Usman; Hu, Liuqing; Yang, Xinyi; Bridgelall, Raj; Huang, Ying (2021)Accelerometers embedded in smartphones have become an alternative means of measuring the roughness of roads. However, the differences in their sensitivity and sampling rates between smartphones could produce measurement ... -
Enabling Mobile Commerce through Pervasive Communications with Ubiquitous RF Tags
Bridgelall, Raj (2003)For many years we’ve heard of the existence of a wonderful new technology called radio frequency identification (RFID) that allows supermarket items to be checked out without human intervention. Advertisements claim ... -
Energy Efficiency of CSMA Protocols for Wireless Packet Switched Networks
Bridgelall, Raj; Chan, Douglas S.; Berger, Toby (2004)The finite battery power in wireless portable computing devices is a motivating factor for developing energy efficient wireless network technologies. This paper investigates energy efficiency, relating it to throughput and ... -
Enhancement of Signals from Connected Vehicles to Detect Roadway and Railway Anomalies
Bridgelall, Raj; Chia, Leonard; Bhardwaj, Bhavana; Lu, Pan; Tolliver, Denver D.; Dhingra, Neeraj (2019)Frequent network-wide monitoring of the condition of roadways and railways prevent fatalities, injuries, and financial losses. Even so, agencies cannot afford to inspect vast transportation networks using present methods. ...