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Articles 1441 - 1470 of 7018
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Exploring The Time-Based Resource-Sharing Model Of Working Memory Through Computational Modeling, Joseph Glavan
Exploring The Time-Based Resource-Sharing Model Of Working Memory Through Computational Modeling, Joseph Glavan
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Working memory is the fundamental component of cognition that allows us to temporarily maintain information needed for concurrent processing. An existing theory from the literature, the time-based resource-sharing (TBRS) model, posits that working memory is a serial, rapidly switching, attentional refreshing mechanism. While others have sought previously to formalize the TBRS model into a computational process model, I go further, using ACT-R to model the influence of working memory on an entire task from end to end. I leverage ACT-R's existing base-level learning mechanism, typically used to model recency and frequency effects in long-term memory, to enact the attentional refreshing …
Sched-Its: An Interactive Tutoring System To Teach Cpu Scheduling Concepts In An Operating Systems Course, Bharath Kumar Koya
Sched-Its: An Interactive Tutoring System To Teach Cpu Scheduling Concepts In An Operating Systems Course, Bharath Kumar Koya
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Operating systems is an essential course in computer science curriculum, which helps students to develop a mental model of how computer operating systems work. The internal mechanisms and processes of an operating system (OS) are often complex, non-deterministic and intangible which makes them difficult for students to understand. One such concept is central processing unit (CPU) scheduling. CPU scheduling forms the basis of the multiprogramming in an OS. In practice, OS courses involve classroom lectures describing high-level abstractions of the concepts, and students complete programming assignments to apply the material in a more concrete way. Depending on the programming assignments, …
A Framework For Centralizing Inventory In Pharmaceutical Supply Chains, Kerry Kathleen Ward
A Framework For Centralizing Inventory In Pharmaceutical Supply Chains, Kerry Kathleen Ward
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Effectively choosing the location of inventory in a pharmaceutical supply chain is central to the mission of pharmaceutical distributors. These supply chains are a critical backbone to the healthcare delivery process: the distributors must deliver products to pharmacies, hospitals and retailers at low cost and with a high level of reliability. This thesis provides a method for analyzing demand data to gain insight on the value of centralizing the inventory into either a hub-and-spoke or national network for a pharmaceutical distribution company. Demand data is analyzed using an off-the-shelf analysis tool as well as a new tool developed in SQL …
An Optimization Compiler Framework Based On Polyhedron Model For Gpgpus, Lifeng Liu
An Optimization Compiler Framework Based On Polyhedron Model For Gpgpus, Lifeng Liu
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General purpose GPU (GPGPU) is an effective many-core architecture that can yield high throughput for many scientific applications with thread-level parallelism. However, several challenges still limit further performance improvements and make GPU programming challenging for programmers who lack the knowledge of GPU hardware architecture. In this dissertation, we describe an Optimization Compiler Framework Based on Polyhedron Model for GPGPUs to bridge the speed gap between the GPU cores and the off-chip memory and improve the overall performance of the GPU systems. The optimization compiler framework includes a detailed data reuse analyzer based on the extended polyhedron model for GPU kernels, …
Multi-Gain Control: Balancing Demands For Speed And Precision, Lucas Warner Lemasters
Multi-Gain Control: Balancing Demands For Speed And Precision, Lucas Warner Lemasters
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Woodworth's Two-Component Theory (1899) partitioned speeded limb movements into two distinct phases: (1) a central ballistic open-loop mechanism and (2) a closed-loop feedback component. The present study investigated the implementation of multi-gain control configurations that utilized separate gain values for each movement phase. A target acquisition task using Fitts' Law (1954) was performed within a virtual environment using three control devices with three gain settings: mono-gain, dual-gain and continuous gain. The gain settings differed by the amount of gain values available to the participant. It was found that dual-gain and continuous gain configurations yielded lower movement times and higher information-processing …
Rf Cmos Tunable Gilbert Mixer With Wide Tuning Frequency And Controllable Bandwidth: Design Sythesis And Verification, Xin Hu
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The double-balanced Gilbert mixer is widely used in RF receivers. In general, it is desirable to design a wide tuning frequency Gilbert mixer for low power, high conversion gain, low noise figure, and good linearity, but they are not easy to attain simultaneously. Therefore, trade-offs always exist by tuning design parameters. To observe the trade-off relationship between each tunable parameter and to make a mixer achieve specified requirements easily (i.e., tuning frequency range, bandwidth, and power), an automated design synthesis and verification approach for Gilbert mixer is proposed. A wide tuning CMOS Gilbert mixer design synthesis while keeping the local …
Structure Stability And Optical Response Of Lead Halide Hybrid Perovskite Photovoltaic Materials: A First-Principles Simulation Study, Siddharth Narendrakumar Rathod
Structure Stability And Optical Response Of Lead Halide Hybrid Perovskite Photovoltaic Materials: A First-Principles Simulation Study, Siddharth Narendrakumar Rathod
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A third-generation of solar cell is based on organic-inorganic hybrid perovskite materials. These have reached up to 22.1% conversion efficiency through exponential growth just within the last decade, compared to much longer improvement times for other photovoltaic technologies. Lead halide perovskites are among the most commonly used materials in this context. Despite the relatively large number of available works on some of these materials, in particular CH3NH3PbI3, others are less investigated. Here, we focused on CH3NH3PbCl3, CH3NH3PbBr3 and CH3NH3PbI3 for assessing structure stability and optical response. Using quantum-mechanics-based first principles approaches, we calculated the optimized structures of these three materials …
Improvement Of Continuous Wave Radar Measurements In A Partially Controlled Environment, Jared Smith
Improvement Of Continuous Wave Radar Measurements In A Partially Controlled Environment, Jared Smith
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A continuous wave (CW) radar system within a partially controlled environment measures scale model aircraft for mono-static and fully polarimetric radar imaging. Due to a pseudo-far-field setup, wavefront curvature manifests primarily as geometric distortion. Recently proposed phase error models show induced geometric distortion to be independent of aperture size which are verified via measurement for Sensors and Signals Exploitation Laboratory (SSEL) collections. The partially controlled nature of the SSEL introduces stray infrastructural reflections into the measured data. Three methods to reduce stray signals are explored namely: true background subtraction (TBS), running average (RA), and spatial filtering (SF). Of the three …
Is Humanism To Blame? Heidegger On Environmental Exploitation, Jacob A. Litteral
Is Humanism To Blame? Heidegger On Environmental Exploitation, Jacob A. Litteral
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Humanism has been targeted as the source of environmental exploitation. With the aid of Martin Heidegger's philosophy, this paper will attempt to answer the environmental critique of humanism. It will be shown that humanism is not to blame for environmental exploitation. This paper will also present Heidegger's alternative to contemporary environmentalism in addressing the issue of exploitation.
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 …
Pre-Mt. Simon Seismic Sequences Below West-Central Indiana: Local Interpretation And Regional Significance, Andrew Michael Parent
Pre-Mt. Simon Seismic Sequences Below West-Central Indiana: Local Interpretation And Regional Significance, Andrew Michael Parent
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Constraining the composition, structure, and origin of basement provinces, deep assemblages of Precambrian rocks, is largely dependent on deep boreholes and geophysical techniques. This is especially true for the eastern U.S. midcontinent. Here, I employ regional 2-D seismic reflection, Bouguer gravity, and aeromagnetic data to interpret the upper crust below west-central Indiana. Seismic reflection data were donated to Wright State University in 2015. Geopotential data are available through the USGS and affiliates. These geophysical data, together, are analyzed in a regional geologic context. Three distinct seismic stratigraphic sequences are observed on 2-D sections. The first, uppermost sequence, typified by continuous, …
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 …
Experimental Investigation Of A Parametric Excitation Of Whistler Waves, Nathan E. Zechar
Experimental Investigation Of A Parametric Excitation Of Whistler Waves, Nathan E. Zechar
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Previous theoretical work has shown that a parametric interaction between electrostatic lower oblique resonance (LOR) and ion acoustic waves (IAW) can produce electromagnetic whistler waves in a cold magnetized plasma. It was also demonstrated theoretically that this interaction can more efficiently generate electromagnetic whistler waves than by direct excitation using a conventional loop antenna. For the purpose of experimentally validating the above result, an experimental facility was designed and constructed utilizing a vacuum chamber, electromagnets, and a helicon plasma source array capable of producing a volume of plasma with high density and spatial uniformity. Additionally, positioning equipment and plasma diagnostics …
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 …
Linking The Variance Of Permeability And Porosity To Newly Interpreted Lithofacies At The Site Of The Illinois Basin - Decatur Project, Decatur, Illinois, Ritu Chaity Ghose
Linking The Variance Of Permeability And Porosity To Newly Interpreted Lithofacies At The Site Of The Illinois Basin - Decatur Project, Decatur, Illinois, Ritu Chaity Ghose
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For effective geological sequestration of CO_2, it is critical to understand the processes associated with CO_2 movement and trapping in reservoirs, which requires a proper understanding of a diverse set of heterogeneous geologic properties. A highly-resolved data set from the Cambrian lower Mt. Simon sandstone reservoir (Unit A) in Decatur, Illinois, was used in a new approach to analyzing the variance of permeability and porosity. Newly interpreted bedding types, along with other factors, including grain size, and presence of bleached alterations, were considered in the analysis of variance. The results reveal that the factors contributing most to the sample variance …
Synthesis Of Alkyl Substituted Phenylated Poly(Ether Ether Ketone Ketone)S, Matthew Cerone
Synthesis Of Alkyl Substituted Phenylated Poly(Ether Ether Ketone Ketone)S, Matthew Cerone
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A phenylated bis(fluorobenzoyl) monomer, 5-hexyl-2,3-diphenyl-1,4-bis(fluorobenzoyl)benzene, was synthesized via a four-step process. The first three compounds synthesized were diethyl 5-hexyl-2,3-diphenyl-1,4-benzenedicarboxylate, 5-hexyl-1,4-bis(hydroxymethyl)-2,3-diphenylbenzene and 5-hexyl-2,3-diphenyl-1,4-benzenedicarboxaldehyde. The final step involved the reaction of the Grignard formed from p-bromofluorobenzene with the dialdehyde to yield a diol intermediate which was oxidized to the bis(fluorobenzoyl) monomer by use of a Jones oxidation. The monomer was polymerized by nucleophilic aromatic substitution (NAS) with bisphenol-A, resorcinol, and hydroquinone in N-methyl-pyrrolidone (NMP) to yield novel, phenylated PEEKKs. The number-average molecular weights (Mn) for the polymers were found to be 35,700 g/mol, 34,800 g/mol and 28,000 g/mol, respectively and the weight-average …
Vitamin D3 And Suppressor Of Cytokine Signaling Proteins Reduces Pro-Inflammatory Cytokines In An Alzheimer’S Disease Like-Model Consisting Of Microglial And Neuronal Co-Cultures, Alexander Evdokiou
Vitamin D3 And Suppressor Of Cytokine Signaling Proteins Reduces Pro-Inflammatory Cytokines In An Alzheimer’S Disease Like-Model Consisting Of Microglial And Neuronal Co-Cultures, Alexander Evdokiou
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This study examined the inflammatory effects of amyloid-ß (Aß42) in a microglial-neuronal co-culture system and determined whether 1a, 25-dihydroxyvitamin D3 (1,25-(OH)2D3) along with suppressor of cytokine signaling (SOCS)1 and SOCS 3 mimetics would attenuate the inflammatory response to Aß42. This culture system, when seeded with Aß42, serves as an in vitro model for Alzheimer’s disease (AD). In a neuronal-microglia co-culture, Aß42 stimulated microglia to secrete TNF-a, but with the addition of 1,25-(OH)2D3, TNF-a levels dropped by nearly eight-fold and to near zero values in the presence of both 1,25-(OH)2D3 and SOCS1 and SOCS 3 mimetics. The reduction of the inflammatory …
Role Of Erk3 In Regulating Rhogdi1-Paks Signaling Axis, Hitham Abdulrahman Aldharee
Role Of Erk3 In Regulating Rhogdi1-Paks Signaling Axis, Hitham Abdulrahman Aldharee
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Extracellular signal-regulated kinase 3 (ERK3) is an atypical protein kinase of the mitogen-activated protein kinase (MAPK) family. In comparison to well-investigated ERK1/2 (classical) MAPKs, much less has been discovered about ERK3 signaling and its cellular functions. Recent studies have shown that ERK3 is overexpressed in various types of cancers such as lung cancer and breast cancer and that ERK3 promotes cancer cell migration and invasion. How ERK3 regulates cancer cell motility and invasiveness, however, is still largely unknown. RhoGTPases, including Rho, Cdc42 and Rac1, play critical roles in regulating cell motility and invasiveness through activating downstream effectors such as p21-activated …
The Effect Of Gram-Positive Staphylococcus Aureus Cell Wall Components Lipoteichoic Acid And Peptidoglycan On Cytokine Production, Cytoskeletal Arrangement, And Cell Viability On Raw 264.7 Murine Macrophages, Gabrielle String
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In this study, gram positive Staphylococcus aureus cell wall components such as lipoteichoic acid (LTA) and peptidoglycan (PGN) were used to study the potential inflammatory and anti-inflammatory cytokine response, cytoskeletal arrangement and cell viability on RAW264.7 murine macrophages over 24 hours. The effect of S.aureus LTA and PGN (5 [mu]g/mL) on RAW 264.7 macrophages was evaluated every six hours for twenty-four hours. Inflammatory cytokine (TNF-a) production peaked at 6 hours before decreasing over time. Anti-inflammatory cytokine (IL-10) production peaked between 12 and 18 hours. During the first twenty-four hours, cytotoxicity of treated macrophages, as defined as the release of lactate …
Analysis Of Well Log Data And A 2d Seismic Reflection Survey In The Vicinity Of London, Ohio, Mohammad Mohshin
Analysis Of Well Log Data And A 2d Seismic Reflection Survey In The Vicinity Of London, Ohio, Mohammad Mohshin
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During the summer of 2015 a 2D seismic line (WSU-2015), ~2.3km long, was collected by Wright State University along Watson Road, south of London, Ohio. This seismic line is parallel to and approximately 1/4 km south of `Line 6' of Mayhew (1969), which is one of six analog, single-fold seismic lines within the area that he studied. The focus of this research is to interpret the stratigraphy revealed by the new seismic line, especially to evaluate the existence or otherwise of a fault that Mayhew (1969) inferred in his interpretation. An important step in this new interpretation was to construct …
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, …
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.
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 …
Investigating Potential Pollutant Sources Causing Lack Of Biodiversity In Lytle Creek And Indian Run, Amira Moayad Alsenbel
Investigating Potential Pollutant Sources Causing Lack Of Biodiversity In Lytle Creek And Indian Run, Amira Moayad Alsenbel
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Limited macroinvertebrate biodiversity in Lytle Creek that runs through downtown Wilmington, Ohio has been documented over decades with the lowest in Lytle Creek at Sugar Grove Cemetery. Lytle Creek, a tributary of the Little Miami River, is a conduit for storm water and wastewater from an airport, downtown storm water with input from local businesses, and a wastewater treatment plant. This study was conducted to see if heavy metal pollution in the sediment, water quality, and Escherichia coli (E. coli) could be contributing factors in reduced macroinvertebrate populations. Eight sites were chosen for sediment sampling to measure trace metals. Mercury …
Detection And Analysis Of Polyurethane Biodegradation Due To Cryptococcus Laurentii, Tyler Jacob Zicht
Detection And Analysis Of Polyurethane Biodegradation Due To Cryptococcus Laurentii, Tyler Jacob Zicht
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Current United States aircraft are equipped with a multitude of protective coatings on the interior and exterior of the vehicle, ultimately enhancing their ability to ensure a safe and effective mission. Aircraft, over the course of their lifetime, will experience impact, corrosion, weathering, and microbial damage to its defensive structures, rendering it vulnerable to attacks. Damaged coatings are then repaired on the aircraft once detected in inspection or replaced in accordance to the lifecycle of the material on the aircraft. However potentially harmful threats such as bacteria are not considered by the Air Force to be dangerous. Therefore, the purpose …
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 …
The Impact Of Socs1 And Socs3 Peptide Mimetics On Rho And Cdc42 Proteins Expression, F-Actin Cytoskeleton Rearrangements, And Cytokines Production Of Uninfected And Hsv-1 Infected M1 And M2 Raw 264.7 Murine Macrophages, Maha A. Elwardany
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The immune system plays an essential role in the pathogenesis of HSV-1 during the lytic phase of the disease, orchestrating the inflammatory response, retaining the virus in its latent phase and preventing the recurrence of HSV-1 infection. Macrophages display a vital role in the innate and adaptive immune responses during multiple phases of HSV-1 infection. Polarized macrophages are categorized into two distinct classes with diverse functions. The classically activated M1 can engulf and destroy the microbial agents, produce proinflammatory cytokines, and participate in the pathogenesis of many inflammatory diseases. The alternatively activated M2 induces anti-inflammatory mediators and stimulates tissue remodeling …