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Articles 511 - 540 of 1911
Full-Text Articles in Entire DC Network
Contracting Strategies: A Different Approach To Address Long-Term Performance, Maria Calahorra-Jimenez
Contracting Strategies: A Different Approach To Address Long-Term Performance, Maria Calahorra-Jimenez
Mineta Transportation Institute
For cost-efficiency, public safety, and sustainability, improving long-term performance in highway projects is imperative for public administrations. Project delivery and procurement methods provide an opportunity to align design and construction processes with this goal. While previous studies have explored whether project delivery methods impact the long-term performance of highway projects, these studies did not focus on how core elements within project procurement relate to long-term performance. Thus, to fill this gap, this research explores how and to what extent long-term evaluation criteria are considered in design-build best-value procurement of highway projects. To this end, the team conducted content analysis on …
Prefabrication And Modular Construction: Cm 214 Residential Construction Learning Module, Matthew V. Keeth
Prefabrication And Modular Construction: Cm 214 Residential Construction Learning Module, Matthew V. Keeth
Construction Management
The residential construction industry in the United States has certainly stuck to the conventional methods of stick-built construction nationwide. What if there was a better way? This project seeks to educate future Construction Management students about a smarter, more efficient, and sustainable method of homebuilding: Modular Construction. Distinguishing the difference between prefabrication and modularization is a necessary standard. Prefabrication is defined as the process of manufacturing the essential structural components of a home at a factory off-site. The large scale structural components of a home are then transported to the jobsite for easy installation. In addition, Modular Construction is defined …
Critical Information Infrastructure Protection, Vulnerabilities, Threats And Challenges: A Critical Review, Krishna Prakasha
Critical Information Infrastructure Protection, Vulnerabilities, Threats And Challenges: A Critical Review, Krishna Prakasha
Manipal Journal of Science and Technology
Protection of Critical Information Infrastructure is a crucial requirement nowadays and requires immediate attention and a lot of prevention activities to avoid any cyber threat to critical IT services. This article aims to give a basic overview of Critical Information Infrastructure (CII) and Critical Sectors such as the Power and Energy Sector, Banking Financial Service and Insurance (BFSI), Telecommunications, Government Services, the Transport Sector, the Health Sector, etc. The consequences of attacks on these sectors have been examined, including their national and international challenges. This article shall also discuss the vulnerabilities of common CII, security controls, emerging trends, threats, and …
Degradation Performance Modeling And Optimal Maintenance Planning Of Deteriorating Critical Infrastructures, Hung Q. Nguyen
Degradation Performance Modeling And Optimal Maintenance Planning Of Deteriorating Critical Infrastructures, Hung Q. Nguyen
USF Tampa Graduate Theses and Dissertations
Serving as the backbone of the nation’s economy, a large and growing number of deteriorating critical infrastructures, such as transportation and water infrastructures, are underperforming, aging, becoming structurally deficient, and must be repaired or replaced. Due to the influence of a variety of factors (e.g., material structure, design, operation, and environmental conditions) at different phases of lifecycle and the costly data acquisition process, field degradation of deteriorating infrastructures is highly uncertain with limited degradation data. The co-location and spatial proximity between many infrastructures, such as road and water infrastructures, further makes them physically and operationally interdependent. The sheer deterioration of …
Research On Fire Emergency Evacuation Simulation Based On Cooperative Deep Reinforcement Learning, Lingjia Ni, Xiaoxia Huang, Hongga Li, Zibo Zhang
Research On Fire Emergency Evacuation Simulation Based On Cooperative Deep Reinforcement Learning, Lingjia Ni, Xiaoxia Huang, Hongga Li, Zibo Zhang
Journal of System Simulation
Abstract: The fire accident is a major threat to the public safety, in which the high temperature, toxic and harmful gases seriously interfer the selection of the evacuation routes. Deep reinforcement learning is introduced into the research of emergency evacuation simulation, and a cooperative double deep Q network algorithm is proposed for the multi-agent environment. A fire scene model that changes dynamically over time is established to provide the real-time information on the distribution of the dangerous areas for the evacuation. The independent agent neural networks are integrated and the multi-agent unified deep neural network is established to realize the …
تقييم مستويات الاشعاع الكهرومغناطيسي في المناطق الخارجية الصادرة عن أنظمة الارسال اللاسلكية في شمال الضفة الغربية – فلسطين, Mutamed Khatib
تقييم مستويات الاشعاع الكهرومغناطيسي في المناطق الخارجية الصادرة عن أنظمة الارسال اللاسلكية في شمال الضفة الغربية – فلسطين, Mutamed Khatib
Palestine Technical University Research Journal
Exposure to electromagnetic fields is a major public concern due to the possible hazardous effects on health caused by exposure to these radiations. The aims of this study were to measure radiofrequency radiation levels from different wireless systems and to compare the results with the recommended limits by the World Health Organization (WHO) which should be less that 450 μw/cm2. The study was a cross-sectional study that was conducted in different cities and villages from the northern governorates in the West Bank; Jenin, Tulkarm, Nablus, Qalqilya, Tubas and Sal fit. To measure the radiation levels ranging from 80 MHz to …
Knowledge-Driven Drug-Use Namedentity Recognition With Distant Supervision, Goonmeet Bajaj, Ugur Kursuncu, Manas Gaur, Usha Lokala, Ayaz Hyder, Srinivasan Parthasarathy, Amit Sheth
Knowledge-Driven Drug-Use Namedentity Recognition With Distant Supervision, Goonmeet Bajaj, Ugur Kursuncu, Manas Gaur, Usha Lokala, Ayaz Hyder, Srinivasan Parthasarathy, Amit Sheth
Publications
As Named Entity Recognition (NER) has been essential in identifying critical elements of unstructured content, generic NER tools remain limited in recognizing entities specific to a domain, such as drug use and public health. For such high-impact areas, accurately capturing relevant entities at a more granular level is critical, as this information influences real-world processes. On the other hand, training NER models for a specific domain without handcrafted features requires an extensive amount of labeled data, which is expensive in human effort and time. In this study, we employ distant supervision utilizing a domain-specific ontology to reduce the need for …
Hybrid Ac/Dc House: The Road To A Sustainable Future, Nicholas Mcadams, Luis Rodriguez
Hybrid Ac/Dc House: The Road To A Sustainable Future, Nicholas Mcadams, Luis Rodriguez
Electrical Engineering
The Hybrid AC/DC house is a sustainable alternative to preexisting residential power systems. The implementation of a DC bus in current homes will allow inefficient DC-AC and AC-DC conversions to be circumvented. This provides a direct path for current to flow to DC loads from DC sources such as solar panels to minimize power losses. In doing so, this will give users the ability to power their homes strictly from renewable sources and substantially decrease reliance on the utility. For this purpose, the hybrid AC/DC house is also designed in such a way to be entirely grid-independent to provide power …
Bridge Project Prioritization, Bryan Gibson, Christopher Van Dyke, Sudhir Palle, Ryan Griffith, Doug Kreis
Bridge Project Prioritization, Bryan Gibson, Christopher Van Dyke, Sudhir Palle, Ryan Griffith, Doug Kreis
Kentucky Transportation Center Research Report
Kentucky’s 14,000+ bridges are key nodes within the state’s surface transportation network. They facilitate the movement of freight, commercial vehicles, and personal vehicles alike. Historically, the Kentucky Transportation Cabinet (KYTC) has prioritized bridge maintenance projects using sufficiency ratings. These ratings are based on three factors — structural adequacy and safety, design obsolescence, and an asset’s importance within the roadway network. Although useful, sufficiency ratings do not account for factors that should be considered during the prioritization process (e.g., condition factors, risk). To address the shortcomings associated with using sufficiency ratings, KYTC — with the assistance of the Kentucky Transportation Center …
Low-Cost Uav Swarm For Real-Time Object Detection Applications, Joel Valdovinos Miranda
Low-Cost Uav Swarm For Real-Time Object Detection Applications, Joel Valdovinos Miranda
Master's Theses
With unmanned aerial vehicles (UAVs), also known as drones, becoming readily available and affordable, applications for these devices have grown immensely. One type of application is the use of drones to fly over large areas and detect desired entities. For example, a swarm of drones could detect marine creatures near the surface of the ocean and provide users the location and type of animal found. However, even with the reduction in cost of drone technology, such applications result costly due to the use of custom hardware with built-in advanced capabilities. Therefore, the focus of this thesis is to compile an …
The Efficacy Of Orange Lane Delineations In Highway Work Zones, Neetu Kaur Sidhu
The Efficacy Of Orange Lane Delineations In Highway Work Zones, Neetu Kaur Sidhu
Construction Management
With over 100,000 crashes in the work zone per year, it is essential that we as builders discover and implement innovative solutions to maximize field crew and public safety in high traffic areas. A recent trend in the Heavy Civil Construction industry has been the implementation of temporary fluorescent orange striping in active highway work zones. When traditional white or yellow lane markings are removed, a faint residue is left behind and as construction crews repeatedly shift lanes, multiple overlapping removal scars begin to create confusion for drivers that leads to an increased risk of crashes. To eliminate this confusion …
Reconciliation, Restoration And Reconstruction Of A Conflict Ridden Country, Muhammad S. Riaz
Reconciliation, Restoration And Reconstruction Of A Conflict Ridden Country, Muhammad S. Riaz
Theses and Dissertations
Conflict has sadly been a constant part of history. Winning a conflict and making a lasting peace are often not the same thing. While a peace treaty ends a conflict and often dictates terms from the winners’ perspective, it may not create a lasting peace. Short of unconditional surrender, modern conflict ends with a negotiated cessation of hostilities. Such accords may have some initial reconstruction agreements, but Reconciliation, Restoration and Reconstruction (RRR) is a long term process. This study maintains that to achieve a lasting peace: 1) The culture and beliefs of the conflict nation must be continuously considered and …
Replication Data For "Estimating Methane Emissions From Underground Natural Gas Pipelines Using An Atmospheric Dispersion-Based Method", Shanru Tian, Kathleen M. Smits, Younki Cho, Stuart Riddick, Daniel Zimmerle, Aidan Duggan
Replication Data For "Estimating Methane Emissions From Underground Natural Gas Pipelines Using An Atmospheric Dispersion-Based Method", Shanru Tian, Kathleen M. Smits, Younki Cho, Stuart Riddick, Daniel Zimmerle, Aidan Duggan
Earth & Environmental Sciences Datasets - Archive
Methane (CH4) leakage from natural gas (NG) pipelines poses an environmental, safety, and economic threat to the public. While previous leak detection and quantification studies focus on the aboveground infrastructure, the analysis of underground NG pipeline leak scenarios is scarce. Furthermore, no data from controlled release experiments have been published on the accuracy of methods used to (1) quantify emissions from an area source and (2) use these emissions to quantify the size of a subsurface leak. This proof-of-concept work uses CH4 mole fraction, as measured by a single gas sensor, as an input to a simple …
Decentralized Intelligent Decision Making In Cyber Physical Social Systems, Nathan Patrizi
Decentralized Intelligent Decision Making In Cyber Physical Social Systems, Nathan Patrizi
Electrical and Computer Engineering ETDs
The accelerated evolution towards jointly considering the physical, cyber, and social space is expected to dramatically increase the interest of the research and industrial community to build efficient, resilient, and secure Cyber Physical Social Systems. In this dissertation, we focus our research activities on devising decentralized intelligent decision making models, frameworks, and algorithms to support the smooth operation of Cyber Physical Social Systems. The proposed decentralized intelligent decision making models are jointly exploiting theories from the field of Economics, such as Game Theory and Contract Theory, and from the field of Computer Science, such as Reinforcement Learning concepts. Reinforcement learning …
Investigation Of Skid Resistance On Asphalt Pavements In Utah, Aaron B. Smith
Investigation Of Skid Resistance On Asphalt Pavements In Utah, Aaron B. Smith
Theses and Dissertations
Friction is one of the essential aspects of pavement performance and safety. Unfortunately, the rate at which the friction data are being collected exceeds the rate at which the data can be proficiently analyzed. Furthermore, the Utah Department of Transportation (UDOT) lacks long-term trend analysis for the many years of locked-wheel skid trailer (LWST) data collected in Utah. In addition, UDOT is missing a statistically adequate correlation equation between friction-testing devices. Likewise, only one method is used in Utah to prequalify aggregates for use in pavements. Finally, there has not been an investigation of the potential use of lithium silicate …
Linking Bad Credentials To Safety Issues, Andrew Martin, Jeeyen Koo, Valerie Keathley-Helil, Mallory Brown, Jennifer Walton
Linking Bad Credentials To Safety Issues, Andrew Martin, Jeeyen Koo, Valerie Keathley-Helil, Mallory Brown, Jennifer Walton
Kentucky Transportation Center Research Report
This study assesses (1) the effectiveness of the Kentucky Automated Truck Screening (KATS) system, (2) the relationship between credential and vehicle safety violations, (3) the relationship between credential and driver safety violations, and (4) the relationship between credential violations and crashes. The KATS system, which is installed at weigh stations throughout the Commonwealth of Kentucky, is highly effective at detecting KYU, IFTA, and UCR violations with sensitivities of 80.54, 87.56, and 88.28 percent, respectively. However, the system is less effective at detecting IRP violations (sensitivity = 20.83 percent). There is a statistically significant relationship between credentialing and vehicle safety violations, …
Software Security Management In Critical Infrastructures: A Systematic Literature Review, Gülsüm Ece Ekşi̇, Bedi̇r Teki̇nerdoğan, Cagatay Catal
Software Security Management In Critical Infrastructures: A Systematic Literature Review, Gülsüm Ece Ekşi̇, Bedi̇r Teki̇nerdoğan, Cagatay Catal
Turkish Journal of Electrical Engineering and Computer Sciences
Critical infrastructure (CI) is an integrated set of systems and assets that are essential to ensure the functioning of a nation, including its economy, the public's health and/or safety. Hence, protecting critical infrastructures (CI) is vital because of the potential severe consequences that may emerge at the national level. Many CIs are now controlled by software, and likewise, software is often the major source of many security problems in critical infrastructures. Software security management in CIs has been addressed in the literature and several useful approaches have been provided. Yet, these approaches are fragmented over multiple different studies, often do …
Detecting Cybersecurity And Behavioral Anomalies In Smart Grid Substation, Anfal Yahya Hathah
Detecting Cybersecurity And Behavioral Anomalies In Smart Grid Substation, Anfal Yahya Hathah
Theses and Dissertations
Due to the increasing number of cyberattacks on smart grid networks globally in the last decade, maintaining a stable electric power supply has become increasingly challenging. The shift from traditional means of measurement instrumentation to smarter devices in electrical substations is experiencing increasing incidents of intrusion. Defense against those intrusions is now a global trending research topic and is attracting governments’ attention. Various techniques have been developed to mitigate the effect of cyberattacks on national power grid systems. The state estimation technique has proven its capability in detecting random false data-injection attacks (FDIAs). However, attackers may have considerable knowledge of …
Assessment Of Parameters For A Safe And Equitable Roadway Network For Pedestrians Of South Carolina, Sababa Islam
Assessment Of Parameters For A Safe And Equitable Roadway Network For Pedestrians Of South Carolina, Sababa Islam
All Dissertations
In 2019, South Carolina ranked fourth in the nation in pedestrian fatalities per 100,000 population. There has been a 68% increase in total pedestrian crashes in SC from 2011 to 2018. Walking might be a choice for some individuals; however, it is mandatory for some users due to the unavailability of personal automobiles or physical disability. Thus, pedestrian crashes and resulting deaths and injuries can disproportionately affect these population segments. Nationwide pedestrian crash statistics reveal American Indian or Alaskan Native and African American populations are overburdened with pedestrian crashes. This research aims to help mitigate this overburden of pedestrian crashes …
Determining Earthquake Impacts On Arkansas' Roadway Network: An Application Of Hazus., Simon Rothwell
Determining Earthquake Impacts On Arkansas' Roadway Network: An Application Of Hazus., Simon Rothwell
Civil Engineering Undergraduate Honors Theses
Natural hazards are a dangerous and unpredictable aspect of life on earth. They can cause devastating damage to our surroundings that makes movement of people, goods, and emergency services difficult. There is a need to plan for these disasters to ensure that damages to our infrastructure and people are minimized. It can be difficult for planners to determine which parts of a roadway network are most vulnerable to a specific disaster and what their impact on the rest of the network may be. This thesis uses a nationally available natural disaster estimation tool developed by FEMA called “Hazus” (FEMA, 2020). …
Data-Driven Framework For Understanding & Modeling Ride-Sourcing Transportation Systems, Bishoy Kelleny
Data-Driven Framework For Understanding & Modeling Ride-Sourcing Transportation Systems, Bishoy Kelleny
Civil & Environmental Engineering Theses & Dissertations
Ride-sourcing transportation services offered by transportation network companies (TNCs) like Uber and Lyft are disrupting the transportation landscape. The growing demand on these services, along with their potential short and long-term impacts on the environment, society, and infrastructure emphasize the need to further understand the ride-sourcing system. There were no sufficient data to fully understand the system and integrate it within regional multimodal transportation frameworks. This can be attributed to commercial and competition reasons, given the technology-enabled and innovative nature of the system. Recently, in 2019, the City of Chicago the released an extensive and complete ride-sourcing trip-level data for …
Safety Evaluation Of Amusement Rides Using Accumulated Accident Data: Accident Data Framework, Kathryn Woodcock
Safety Evaluation Of Amusement Rides Using Accumulated Accident Data: Accident Data Framework, Kathryn Woodcock
Journal of Themed Experience and Attractions Studies
Amusement rides and devices are a popular form of recreation and important component of the tourism industry. Injury-producing accidents are rare, and the viability of the industry relies on perceived safety of the activity. Some existing metrics use accumulated accident reports. Several metrics tabulate the number of injuries, but none collect enough information about the context of accidents to analyse the accumulated data to deduce patterns. This paper describes an Accident Data Framework for a minimal set of variables from reports of amusement device accident, and the structure for a useful narrative to aid reporters and recorders to avoid introducing …
When The Magic Closes: Examining How Disney Fans Coped With Theme Park And Resort Closures Amid The Covid-19 Pandemic, Cody Havard, Carissa A. Baker, Daniel L. Wann, Rick Grieve
When The Magic Closes: Examining How Disney Fans Coped With Theme Park And Resort Closures Amid The Covid-19 Pandemic, Cody Havard, Carissa A. Baker, Daniel L. Wann, Rick Grieve
Journal of Themed Experience and Attractions Studies
This essay discusses a qualitative investigation we conducted with fans of the Disney parks and resorts during the summer of 2020 regarding the company’s handling of the COVID-19 pandemic. Specifically, 22 people responded to open-ended questions from an online survey to discuss their views of the closures and planned reopenings of the Disney parks and resorts amid the early days of the pandemic. Using social identity theory (Tajfel, 1978) and the theory of planned behavior (Ajzen, 1991), we discuss how fans react to and cope with the temporary loss of a favorite activity and how companies in the themed entertainment …
Electromagnetically Propelled Garage Door, Connor Seifert
Electromagnetically Propelled Garage Door, Connor Seifert
Honors Theses
Garage door systems are loud and energy inefficient given their many contact points and need for continual maintenance. Most garage door systems use a loud, bulky electric motor to pull the garage door up and down using a chain. To reduce noise and energy loss due to friction from the electric motor and chain, electromagnetic forces used in Electromagnetic Suspension (EMS) trains were researched and adapted to a garage door system. The electromagnetically propelled garage door (EPGD) system was designed and validated using SOLIDWORKS and ANSYS simulation with significantly less contact points due to non-contact electromagnetic propulsion (EMP). The design …
Effects Of Emergency Vehicle Warning Lighting System Characteristics On Driver Perception And Behavior, Emily Hiebner
Effects Of Emergency Vehicle Warning Lighting System Characteristics On Driver Perception And Behavior, Emily Hiebner
Doctoral Dissertations and Master's Theses
Secondary crashes, including struck-by incidents are a leading cause of line-of-duty deaths among emergency responders, such as firefighters, law enforcement officers, and emergency medical service providers. The introduction of light emitting diode (LED) sources and advanced lighting control systems, provides a wide range of options for emergency lighting configurations. This study investigated the impact of lighting color, intensity, modulation, and flash rate on driver behavior while traversing a traffic incident scene at night. The impact of retroreflective chevron markings in combination with lighting configurations, as well as the measurement of “moth-to-flame” effects of emergency lighting on drivers was also investigated. …
A Computer Vision-Based Method For Bolt Loosening Detection, Savannah Burdette
A Computer Vision-Based Method For Bolt Loosening Detection, Savannah Burdette
Honors Theses
Routine bolt-loosening inspection plays an essential role in managing and preventing the degradation of our nation’s highway bridges over time. Neglecting to perform these inspections could result in public safety concerns. The study of this thesis develops a cost-effective method of bolt-loosening detection based on computer vision. To this end, two input images of the bolted connections are collected at two different inspection times. The feature points are then identified from the input images, based on which a geometric transformation matrix is applied to correct any perspective differences between the two images. Next, we select the image patches of the …
The Submission Of A Section 513(G) Request For Information, Morgan Ashley Lano
The Submission Of A Section 513(G) Request For Information, Morgan Ashley Lano
Theses and Dissertations
The Food and Drug Administration designates all medical devices into one of three general classes contingent on their intended use, indications for use, and potential risk to the user. This classification dictates the further path the device must take to be approved for the commercial market. Section 513(g) of the Federal Food, Drug, and Cosmetic Act (21 U.S.C. 360c(g)) is submitted in order to gain the agency’s unofficial classification and suggested regulatory requirements. The Coagulation Companion (MicroVide) is a device designed to fluorescently quantify a key enzyme involved in the coagulation cascade, plasmin, in pediatric patients. clot formation and degradation …
Monitoring Of Structural Quality Under Construction Using 3d Point Cloud Data, Xinxing Yuan
Monitoring Of Structural Quality Under Construction Using 3d Point Cloud Data, Xinxing Yuan
Civil Engineering ETDs
Inspection of infrastructure under construction has become an active research topic in the past few decades. Due to rising costs and safety concerns of current inspection methods, automated inspection methods are proposed. In this context, this dissertation has developed a framework that uses 3D point cloud data from the bridge under construction and evaluates the design specifications and the strength capacity of the structure while is being built. This study presents a slicing algorithm for automatically evaluating rebar placement using 3D point cloud data. The outcomes of this research provide structural engineering with (i) automatic inspection of reinforcement during construction; …
Importance Of Proactive Safety Analysis For Corridor Planning, Martin Guttenplan, Houssam Ghandour
Importance Of Proactive Safety Analysis For Corridor Planning, Martin Guttenplan, Houssam Ghandour
Purdue Road School
A proactive safety analysis approach assists decision makers in addressing high-risk crash elements, particularly on low-volume roadways. Using corridor planning best practices and lessons learned, this presentation will explore creative and proactive approaches for holistic planning solutions. It will also validate 2020 pandemic crash data accuracy and highlight prioritization methodologies and AASHTO and FHWA guided countermeasures applied to at-risk locations.
Integrated Mobile Observations - Future Of Mobile Observation Data Technologies, Tony Coventry
Integrated Mobile Observations - Future Of Mobile Observation Data Technologies, Tony Coventry
Purdue Road School
Mobile observations have become an integral part of snow and ice programs. In this session we will learn about the FHWA IMO (integrating mobile observations) initiative; how mobile sensors have evolved; and what these new units are capable of doing. Discussion will include how this technology can help both the operator and the agency, how the data is visualized and used, and how agencies and airports have implemented these units.