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Articles 571 - 600 of 1369
Full-Text Articles in Engineering
Oclep+: One-Class Intrusion Detection Using Length Of Patterns, Sai Kiran Pentukar
Oclep+: One-Class Intrusion Detection Using Length Of Patterns, Sai Kiran Pentukar
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In an earlier paper, a method called One-class Classification using Length statistics of (jumping) Emerging Patterns (OCLEP) was introduced for masquerader detection. Jumping emerging patterns (JEPs) for a test instance are minimal patterns that match the test instance but they do not match any normal instances. OCLEP was based on the observation that one needs long JEPs to differentiate an instance of one class from instances of the same class, but needs short JEPs to differentiate an instance of one class from instances of a different class. In this thesis, we present OCLEP+, One-class Classification using Length statistics of Emerging …
Low-Velocity Impact Behavior Of Sandwich Panels With 3d Printed Polymer Core Structures, Andrew Joseph Turner
Low-Velocity Impact Behavior Of Sandwich Panels With 3d Printed Polymer Core Structures, Andrew Joseph Turner
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Sandwich panel structures are widely used in aerospace, marine, and automotive applications because of their high flexural stiffness, strength-to-weight ratio, good vibration damping, and low through-thickness thermal conductivity. These structures consist of solid face sheets and low-density cellular core structures, which are often based upon honeycomb topologies. The recent progress of additive manufacturing (AM) (popularly known as 3D printing) processes has allowed lattice configurations to be designed with improved thermal-mechanical properties. The aim of this work is to design and print lattice truss structures (LTS) keeping in mind the flexible nature of AM. Several 3D printed core structures were created …
Enhancing Engineering Education Using Mobile Augmented Devices, Kushal Abhyankar
Enhancing Engineering Education Using Mobile Augmented Devices, Kushal Abhyankar
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Employing effective and modern educational systems that support augmented learning methods such as mobile-based learning, may offer a promising solution to lowering dropout rates and to improving learning interests in engineering education. Mobile-based learning is capturing tremendous attention due to the affordances mobile devices can offer. This project outlines efforts to integrate mobile-based educational technology into the classroom. Leveraging the affordances, we designed a mobile augmented education tool for basic math and physics concepts that allows access to information and additional learning content within the context of classroom learning. Results from the study indicate that there is significant improvement in …
Conditional Correlation Analysis, Sanjeev Bhatta
Conditional Correlation Analysis, Sanjeev Bhatta
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Correlation analysis is a frequently used statistical measure to examine the relationship among variables in different practical applications. However, the traditional correlation analysis uses an overly simplistic method to do so. It measures how two variables are related in an application by examining only their relationship in the entire underlying data space. As a result, traditional correlation analysis may miss a strong correlation between those variables especially when that relationship exists in the small subpopulation of the larger data space. This is no longer acceptable and may lose a fair share of information in this era of Big Data which …
Extended Kalman Filter And Lqr Controller Design For Quadrotor Uavs, Muneeb Masood Raja
Extended Kalman Filter And Lqr Controller Design For Quadrotor Uavs, Muneeb Masood Raja
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A quadrotor is a unique class of UAVs with vertical take off and landing (VTOL) capability and has attracted significant attention due to its importance in various applications. This thesis presents the design and experimental implementation of Extended Kalman Filters (EKFs) to estimate the states of a quadrotor and a Linear Quadratic Regulator (LQR) controller with integral action to meet the desired control objectives. In case of the Extended Kalman Filters, two different situations are considered: (1) all the states including the Inertial Measurement Unit (IMU) biases are estimated; (2) only the attitude, altitude, and vertical velocity are estimated. The …
Mathematical Modeling Of A P-N Junction Solar Cell Using The Transport Equations, Surjeet Singh
Mathematical Modeling Of A P-N Junction Solar Cell Using The Transport Equations, Surjeet Singh
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While analytical models are limited in the situations that they can simulate, they are generally easier to implement than numerical models and provide a rapid view of the variables which affect a certain quantity. Analytical models are also very useful in educational situations; such as a graduate class on photovoltaics. The modeling of the interior workings of a solar cell can be complex and involved; and some of the equations can become quite lengthy. A focus of this thesis work is the derivation of the minority carrier density and minority current density equations for a p-n junction solar cell. The …
Implementation Of Rf Steganography Based Joint Radar/Communication Lfm Waveform Using Software Defined Radio, Dimitri Dessources
Implementation Of Rf Steganography Based Joint Radar/Communication Lfm Waveform Using Software Defined Radio, Dimitri Dessources
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Incident Command System provides a framework for commanders to manage an incident. However, maintaining good situation awareness in an emergency situation is often challenging to the Incident Commander. Stress may result in task fixation which may cause the commander to miss critical information and can eventually lead to poor decisions. The proposed augmented decision support system, with an integrated knowledge base, enhances the commander's decision making and situation awareness by presenting the information that may have been missed. The system has been evaluated to investigate its utility in chemical hazard scenarios. The system was used by experienced Incident Commanders to …
Persistent Inward Currents Play A Role In Muscle Dysfunction Seen In Myotonia Congenita, Ahmed Alaa Hawash
Persistent Inward Currents Play A Role In Muscle Dysfunction Seen In Myotonia Congenita, Ahmed Alaa Hawash
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Myotonia congenita is a rare skeletal muscle channelopathy caused by a reduced chloride channel (ClC-1) current, which results in debilitating muscle hyperexcitability, prolonged contractions, and transient episodes of weakness. The excitatory events that trigger myotonic action potentials in the absence of stabilizing ClC-1 current are not fully understood. My in vitro intracellular recordings from a mouse homozygous knockout of ClC-1 revealed a slow after-depolarization (AfD) that triggers myotonic action potentials. The AfD is well-explained by a tetrododoxin-sensitive and voltage-dependent Na+ persistent inward current (NaPIC). Notably, this NaPIC undergoes slow inactivation over seconds, thus providing the first mechanistic explanation for the …
Identifying The Impact Of Noise On Anomaly Detection Through Functional Near-Infrared Spectroscopy (Fnirs) And Eye-Tracking, Ryan Dwight Gabbard
Identifying The Impact Of Noise On Anomaly Detection Through Functional Near-Infrared Spectroscopy (Fnirs) And Eye-Tracking, Ryan Dwight Gabbard
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Occupational noise frequently occurs in the work environment in military intelligence, surveillance, and reconnaissance (ISR) operations. This impacts cognitive performance by acting as a stressor, potentially interfering with the analysts' decision making process. In this study the effects of different noise stimuli on analysts' performance and workload in anomaly detection were investigated by simulating a noisy work environment. Functional near infrared spectroscopy (fNIRS) was utilized to quantify oxy-hemoglobin (HbO) and deoxy-hemoglobin (HbD) concentration changes in the prefrontal cortex (PFC), as well as behavioral measures which include eye-tracking, reaction time, and accuracy rate. It was found that HbO for some of …
A Comparative Study Of Bagging And Boosting Of Supervised And Unsupervised Classifiers For Outliers Detection, Yue Dang
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The problem of outlier detection has received increasing attention recently because it plays a great role in many fields such as credit fraud detection, cyber security, etc. Machine Learning approach is an excellent choice for outlier detection due to its accuracy and efficiency. Outlier detection problem is unique due to the so-called classes imbalance: the inliers are extreme majority and the outliers are minority. Ensemble methods are popular in classification and regression task in practice to improve the performance of machine learning algorithms. Bagging and boosting are two common methods of them. In this thesis, we want to show the …
Incorporating Passive Compliance For Reduced Motor Loading During Legged Walking, Akhil Sai Pabbu
Incorporating Passive Compliance For Reduced Motor Loading During Legged Walking, Akhil Sai Pabbu
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For purposes of travelling on all-terrains surfaces that are both uneven and discontinuous, legged robots have upper-hand over wheeled and tracked vehicles. The robot used in this thesis is a simulated hexapod with 3 degrees of freedom per leg. The main aim is to reduce the energy consumption of the system during walking by attaching a passive linear spring to each leg which will aid the motors and reduce the torque required while walking. Firstly, the ideal stiffness and location or the coordinates for mounting the spring is found out using gradient based algorithm called `Simultaneous Perturbation and Stochastic Approximation …
Resilience And Toughness Behavior Of 3d-Printed Polymer Lattice Structures: Testing And Modeling, Mohammed Al Rifaie
Resilience And Toughness Behavior Of 3d-Printed Polymer Lattice Structures: Testing And Modeling, Mohammed Al Rifaie
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This research focuses on the energy absorption capability of additively manufactured or 3D printed polymer lattice structures of different configurations. The Body Centered Cubic (BCC) lattice structure is currently being investigated by researchers for energy absorption applications. For this thesis, the BCC structure is modified by adding vertical bars in different arrangements to create three additional configurations. Four designs or sets of the lattice structure are selected for comparison including BCC, BCC with vertical bars added to all nodes (BCCV), BCC with vertical bars added to alternate nodes (BCCA), and BCC with gradient arrangements of vertical bars (BCCG). Both experimental …
Studies Of Ionic Liquid Hybrids: Characteristics And Their Potential Application To Li-Ion Batteries And Li-Ion Capacitors, Mengxin Liu
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Ionic liquids (ILs) have attracted much attention in electrochemical energy storage systems for their advantageous properties over traditional lithium salt/carbonate solvent electrolyte in terms of higher electrochemical potential windows, comparable ionic conductivity, negative vapor pressure and non-flammability. Ionic liquids can be used as the solvent-free electrolyte in electrochemical double layer capacitors (EDLCs) or can act as the important additives to the carbonate electrolyte in lithium ion batteries (LIBs). Recently, lithium ion capacitors (LICs) have emerge as a novel energy storage system to satisfy the demands for higher energy density and higher power density in portable and transportation systems. This Master …
Design And Demonstration Of A Physical, Multi-Agent Autonomous Controller Testbed, Eric A. Nees
Design And Demonstration Of A Physical, Multi-Agent Autonomous Controller Testbed, Eric A. Nees
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Navigation and control algorithms are often tested in a simulated environment before being deployed in physical systems. Although simulated environments provide a controlled setting to carefully evaluate performance, the designed scenarios are sometimes unrealistically ideal and may unintentionally omit circumstances or unmodeled interactions. This thesis presents the design, implementation, and practical demonstration of a physical testbed that enables the testing of multi-agent autonomous strategies in hardware on a small scale. Testing the algorithms at scale allows real-time exploration of the interaction and performance of both human and autonomous algorithms under non-ideal conditions while avoiding the costs and risks of full-scale, …
Evaluating Mobile Information Display System In Transfer Of Care, Katelyn Berberich
Evaluating Mobile Information Display System In Transfer Of Care, Katelyn Berberich
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Transfer of care continuum is highly dynamic in nature and there are multiple complexities associated with man-man interaction and man-machine interaction. During transfer of patient care, which occurs from an emergency medical team (EMT) to an emergency department, adequate information related to the patient must be communicated very quickly and precisely. Challenges EMTs and emergency department personnel face are communicating and obtaining all the essential information to ensure the patient receives the best care. Providing the receiving emergency department with patient vitals and pre-hospital procedures that occurred en route could allow for enhanced preparation and improved communication during the transfer …
A Numerical And Experimental Investigation Of Steady-State And Transient Melt Pool Dimensions In Additive Manufacturing Of Invar 36, Chigozie Nwachukwu Obidigbo
A Numerical And Experimental Investigation Of Steady-State And Transient Melt Pool Dimensions In Additive Manufacturing Of Invar 36, Chigozie Nwachukwu Obidigbo
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The use of additive manufacturing (AM) in tooling enables low production components to be fabricated with lower costs, reduced waste, increased design flexibility and reduced lead time. Invar 36 is a popular metal tooling material known for its low coefficient of thermal expansion. This work uses thermal finite element (FE) modeling as a tool to determine the feasibility of using Invar 36 in AM and to investigate the transient effect from common scanning strategies. Results show that the steady-state melt pool dimensions behave similar to traditional AM materials for varying process parameters. Transient results show that the melt pool response …
Distributed Adaptive Fault-Tolerant Control Of Nonlinear Uncertain Multi-Agent Systems, Mohsen Khalili
Distributed Adaptive Fault-Tolerant Control Of Nonlinear Uncertain Multi-Agent Systems, Mohsen Khalili
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The research on distributed multi-agent systems has received increasing attention due to its broad applications in numerous areas, such as unmanned ground and aerial vehicles, smart grid, sensor networks, etc. Since such distributed multi-agent systems need to operate reliably at all time, despite the possible occurrence of faulty behaviors in some agents, the development of fault-tolerant control schemes is a crucial step in achieving reliable and safe operations. The objective of this research is to develop a distributed adaptive fault-tolerant control (FTC) scheme for nonlinear uncertain multi-agent systems under intercommunication graphs with asymmetric weights. Under suitable assumptions, the closed-loop system's …
Rendering Owl In Latex For Improved Readability: Extensions To The Owlapi, Cogan M. Shimizu
Rendering Owl In Latex For Improved Readability: Extensions To The Owlapi, Cogan M. Shimizu
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As ontology engineering is inherently a multidisciplinary process, it is necessary to utilize multiple vehicles to present an ontology to a user. In order to examine the content of an ontology, formal logic renderings of the axioms appear to be a very helpful approach for some. This thesis introduces a number of incremental improvements to the OWLAPI's \LaTeX{} rendering framework in order to improve the readability, concision, and correctness of OWL files translated into Description Logic and First Order Logic. In addition, we examine the efficacy of these renderings as vehicles for understanding an ontology.
Last Two Surface Range Detector For Direct Detection Multisurface Flash Lidar In 90nm Cmos Technology, Douglas Preston
Last Two Surface Range Detector For Direct Detection Multisurface Flash Lidar In 90nm Cmos Technology, Douglas Preston
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This thesis explores a novel detection architecture for use in a Direct-Detect Flash LIDAR system. The proposed architecture implements detection of the last two surfaces within single pixels of a target scene. The novel, focal plane integrated detector design allows for detection of objects behind sparse and/or partially reflective covering such as forest canopy. The proposed detector would be duplicated and manufactured on-chip behind each avalanche photodiode within a focal plane array. Analog outputs are used to minimize interference from digital components on the analog input signal. The proposed architecture is a low-footprint solution which requires low computational post-processing. Additionally, …
Functions Of The Apical Na+/ K+/ 2cl- Cotransporter 1 In Choroid Plexus Epithelial Cells, Jeannine Marie Crum Gregoriades
Functions Of The Apical Na+/ K+/ 2cl- Cotransporter 1 In Choroid Plexus Epithelial Cells, Jeannine Marie Crum Gregoriades
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Choroid plexus epithelial cells (CPECs) secrete cerebrospinal fluid (CSF) and regulate its electrolyte composition. CPECs express both the Na+/ K+ ATPase and the Na+/ K+/ 2Cl- cotransporter 1 (NKCC1) on their apical membrane (CSF facing), deviating from the typical basolateral membrane location in chloride secretory epithelia. Given this unusual location of NKCC1 and the unknown intracellular Na+ and Cl- concentrations of CPECs, the cotransporter function in these cells is not understood. Further, the direction of net ion and associated water fluxes mediated by NKCC1 under basal physiological conditions in CPECs is controversial. Determining the direction of NKCC1- mediated fluxes is …
A 13t Single-Ended Low Power Sram Using Schmitt-Trigger And Write-Assist, Praneeth Namala
A 13t Single-Ended Low Power Sram Using Schmitt-Trigger And Write-Assist, Praneeth Namala
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SRAMs are widely used in application based systems like medical instruments, portable electronic devices from caches to registers. Technology scaling of transistor into nanometer regime has substantially increased memory density that occupies large silicon area in today's IC's and consumes significant amount of active and leakage power. So, design requirements and challenges such as memory write and read speed, leakage power, noise margin and process-voltage-temperature (PVT) variations also significantly increase. In this thesis, a 13T single-ended low power SRAM using Schmitt-Trigger and write-assist technique is presented. It enhances read static noise margin, write-1 and read-0 access time, specifically at low …
Modeling Two Phase Flow Heat Exchangers For Next Generation Aircraft, Hayder Hasan Jaafar Al-Sarraf
Modeling Two Phase Flow Heat Exchangers For Next Generation Aircraft, Hayder Hasan Jaafar Al-Sarraf
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Two-phase heat exchangers offer the potential of significant energy transfer by taking advantage of the latent heat of vaporization as the working fluid changes phase. Unfortunately, the flow physics of the phase change process is very complex and there are significant gaps in the fundamental knowledge of how several key parameters are affected by the phase change process. Therefore, an initial investigation modeling a two-phase flow heat exchanger has been accomplished. Many key assumptions have been defined which are critical to modeling two-phase flows. This research lays an initial foundation on which further investigations can build upon. Two-phase heat exchangers …
Deep Learning Approach For Intrusion Detection System (Ids) In The Internet Of Things (Iot) Network Using Gated Recurrent Neural Networks (Gru), Manoj Kumar Putchala
Deep Learning Approach For Intrusion Detection System (Ids) In The Internet Of Things (Iot) Network Using Gated Recurrent Neural Networks (Gru), Manoj Kumar Putchala
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The Internet of Things (IoT) is a complex paradigm where billions of devices are connected to a network. These connected devices form an intelligent system of systems that share the data without human-to-computer or human-to-human interaction. These systems extract meaningful data that can transform human lives, businesses, and the world in significant ways. However, the reality of IoT is prone to countless cyber-attacks in the extremely hostile environment like the internet. The recent hack of 2014 Jeep Cherokee, iStan pacemaker, and a German steel plant are a few notable security breaches. To secure an IoT system, the traditional high-end security …
Null Values And Null Vectors Of Matrix Pencils And Their Applications In Linear System Theory, Neel Dalwadi
Null Values And Null Vectors Of Matrix Pencils And Their Applications In Linear System Theory, Neel Dalwadi
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Considerable literature exists in linear algebra to solve the generalized eigenvalue, eigenvector problem (F − [lambda]G)v = 0 where F, G 2 Rs×s, are square matrices. However, a number of applications lend themselves to the case whereF, G 2 Rs×, and s ≠ t. The existing methods cannot be used for such non-square cases. This research explores structural decomposition of a matrix pencil (F − [lambda]G), s 6≠ t to compute finite values of [lambda] for which rank (F − [lambda]G) < min(s, t). Moreover, from the decomposition of the matrix pencil, information about the order of [lambda] at infinity, the Kronecker row and column indices of a matrix pencil can also be extracted. Equally important is the computation of non-zero vectors w 2 R1×s and v 2 Rt×1 corresponding to each finite value of [lambda], such that w(F - [lambda] G) = 0 and (F - [lambda]G)v = 0. Algorithms are developed for the computation of lambda, w, and v using numerically efficient techniques. Proposed algorithms are applied to problems encountered in system theory and illustrated by means of numerical examples.
An Engage Or Retreat Differential Game With Mobile Agents, Swathi Chandrasekar
An Engage Or Retreat Differential Game With Mobile Agents, Swathi Chandrasekar
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The thesis is aimed at developing optimal defensive strategies that dissuade an attacker from engaging a defender while simultaneously persuading the attacker to retreat. A two-player Engage or Retreat differential game is developed in which one player represents a mobile attacker and the other player represents a mobile defender. Both players are modeled as massless particles moving with constant velocity. The choice to terminate the game in engagement or retreat lies with the attacker. The defender indirectly influences the choice of the attacker by manipulating the latter's utility function. In other words, the defender co-operates with the attacker so that …
Portable Motion Lab For Diagnostic And Rehabilitation Processes, Yogesh Laxman Chavan
Portable Motion Lab For Diagnostic And Rehabilitation Processes, Yogesh Laxman Chavan
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In this thesis research, we have explored the capabilities of a household body-tracking device - Microsoft Xbox Kinect for motion analysis and assessment to assist patient’s rehabilitation after joint replacement and repair surgeries. In particular, we have combined the motion tracking capabilities of Kinect with the 3D modelling of human body for accurate and intuitive movement assessment and feedback. Our prototype system demonstrates the effective and efficient workflow of motion capturing, data processing and analyzing and augmented reality based presentation, resulting in a design which is not only accurate, reliable and robust, but also extremely cost- and space-efficient. Furthermore, we …
Detecting Information Leakage In Android Malware Using Static Taint Analysis, Soham P. Kelkar
Detecting Information Leakage In Android Malware Using Static Taint Analysis, Soham P. Kelkar
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According to Google, Android now runs on 1.4 billion devices. The growing popularity has attracted attackers to use Android as a platform to conduct malicious activities. To achieve these malicious activities some attacker choose to develop malicious Apps to steal information from the Android users. As the modern day smartphones process, a lot of sensitive information, information security, and privacy becoming a potential target for the attacker. The malicious Apps steal information from the infected phone and send this information to the attacker-controlled URLs using various Android sink functions. Therefore, it necessary to protect data as it can prove detrimental …
Configuration And Electronic Properties Of The Interface Between Lead Iodide Hybrid Perovskite And Self-Assembled Monolayers In Solar Cells, Parin Divya Amlani
Configuration And Electronic Properties Of The Interface Between Lead Iodide Hybrid Perovskite And Self-Assembled Monolayers In Solar Cells, Parin Divya Amlani
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Hybrid perovskite photovoltaic materials are currently the most promising functional materials for solar cell applications with efficiency reaching to those of more conventional materials such as silicon. Using self-assembled monolayers between photovoltaic materials and electrodes is a method for improving the stability and functionality. Recent experiments have shown that using 4-mercaptobenzoic acid and pentafluorobenzenethiol monolayers bridging lead iodide hybrid perovskite photovoltaic materials and electrodes result in improved stability and efficiency. The details of monolayer assembly, molecular adsorption configuration, and resulting modification of electronic properties are important characteristics related to solar cell performance. These characteristics can be obtained through accurate computer …
Turboelectric Distributed Propulsion System For Nasa Next Generation Aircraft, Hashim H. Abada
Turboelectric Distributed Propulsion System For Nasa Next Generation Aircraft, Hashim H. Abada
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Next generation aircraft, more specifically NASA aircraft concepts, will include new technologies and make many advancements in fuel economy and noise. However, there are some challenges associated with the latest technologies that NASA is planning to use for the next generation aircraft. For example, these aircraft concepts require large amounts of electrical power to generate the required thrust throughout a notional flight profile. One of the new technologies is using advanced propulsion systems, such as the Turboelectric Distributed Propulsion (TeDP) system, which is significantly different from current aerospace high bypass turbofan based propulsion system. The TeDP propulsion system replaces the …
Computational Simulations Of Biomechanical Kinematics In Wsu Total Ankle Replacement Systems, Dinesh Gundapaneni
Computational Simulations Of Biomechanical Kinematics In Wsu Total Ankle Replacement Systems, Dinesh Gundapaneni
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Ankle arthritis constitutes about 10% of all joint arthritis cases, however, the revision rate of ankle replacement devices is three times higher than comparable hip and knee devices. With complicated bone morphology and surrounding ligament structures, the physiological and gait characteristics of the ankle joint presents a challenge to biomechanicians. As a result, there is a lack of fundamental understanding how the ligaments and articular surfaces interact. The objective of this doctoral research is to address the pattern of contact at the joint articulation, the fundamental role of ligaments in joint mobility, and biomechanics of total ankle replacement (TAR) devices. …