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Articles 31 - 51 of 51
Full-Text Articles in Engineering
An Empirical Investigation Of Supply Chain Excellence In Healthcare, Brian Keith Smith
An Empirical Investigation Of Supply Chain Excellence In Healthcare, Brian Keith Smith
Graduate Theses and Dissertations
This research is motivated by opportunities to improve the cost and quality of healthcare delivery through improved supply chain processes. This research assesses the quality of the healthcare supply chain and identifies factors that are driving supply chain excellence among organizations in the healthcare industry. The first objective of this research is to assess the state of quality measurement in the healthcare supply chain. The achievement of this first objective is presented in Chapter 3 of this dissertation in the form of a manuscript accepted for publication in The Quality Management Journal. The second research objective is to develop …
Evaluating The Capacity Of A Proton Therapy Facility, Ridvan Gedik
Evaluating The Capacity Of A Proton Therapy Facility, Ridvan Gedik
Graduate Theses and Dissertations
A relatively new consideration in proton therapy planning is the requirement that the mix of patients treated satisfy desired percentages. Since it is very dicult to satisfy an integer number of patients in light of these requirements, deviations from patient mix preferences and their impacts on operational capabilities are of particular interest to healthcare planners. Therefore, we propose a bicriteria mathematical programming model that determines an outpatient schedule maximizing the number of fractions and minimizing the deviations from the patient mix ratios over the planning horizon. The tradeos between the two objectives are identied through analysis of ecient frontiers. Our …
On The Complexity Of Grid Coloring, Daniel Christopher Apon
On The Complexity Of Grid Coloring, Daniel Christopher Apon
Graduate Theses and Dissertations
This thesis studies problems at the intersection of Ramsey-theoretic mathematics, computational complexity, and communication complexity. The prototypical example of such a problem is Monochromatic-Rectangle-Free Grid Coloring. In an instance of Monochromatic-Rectangle-Free Grid Coloring, we are given a chessboard-like grid graph of dimensions n and m, where the vertices of the graph correspond to squares in the chessboard, and a number of allowed colors, c. The goal is to assign one of the allowed colors to each vertex of the grid graph so that no four vertices arranged in an axis-parallel rectangle are colored monochromatically. Our results include: 1. A conditional, …
Applying Inventory Control Practices Within The Sisters Of Mercy Health Care Supply Chain, Server Apras
Applying Inventory Control Practices Within The Sisters Of Mercy Health Care Supply Chain, Server Apras
Graduate Theses and Dissertations
This research lays a foundation for the better understanding of the application and acceptance of more advanced inventory control practices within the health care supply chain. The demand characteristics and optimal control policies for pharmaceutical items within a multi-echelon provider network are examined within the framework of a case study. Demand forecasting algorithms were applied to forecast demand for inventory control procedures. A spreadsheet-based inventory planning tool was used to minimize the inventory holding and ordering costs subject to fill rate constraints. The costs of inventory control models are compared to the current ordering and inventory control strategies to document …
Understanding The Role Of A Bio-Inspired Surface Modification For Delayed Icing, Clayton Schenk
Understanding The Role Of A Bio-Inspired Surface Modification For Delayed Icing, Clayton Schenk
Graduate Theses and Dissertations
Atmospheric icing event is problematic for outdoor structures because it can damage, slow, impede, and danger general routine. For a wind turbine blade, it can damage, disrupt movement, and cause potentially dangerous ice throw. Anti-icing based on a surface texture is advantageous due to the low cost of maintenance and there is no additional requirement of energy output for preventing the icing problem. This work is based on the biomimicry of the superhydrophobic nature of the lotus leaf, whereas the limited wettability supports the water to flow freely from the surface structure. The phenomenon is based on a morphology and …
A Solid State Nitrogen Gas Generating Chip And Applications For Picosatellites, Kyle Godin
A Solid State Nitrogen Gas Generating Chip And Applications For Picosatellites, Kyle Godin
Graduate Theses and Dissertations
A microscale gas generating chip has many applications; in this study, applications relating to picosatellites have been considered. Cube satellites, a type of picosatellite, are of mass around one kilogram and side length 10cm x 10cm x 10cm. Their launches are becoming more numerous since their debut ten years ago. Their low cost and deployment system makes space accessible to agencies hitherto barred from it, such as universities and small governments. However, their power, mass, and volume budget is extremely tight. A microscale gas chip could compete with other designs for attitude control devices, most not flown yet as cube …
File System Simulation: Hierarchical Performance Measurement And Modeling, Hai Quang Nguyen
File System Simulation: Hierarchical Performance Measurement And Modeling, Hai Quang Nguyen
Graduate Theses and Dissertations
File systems are very important components in a computer system. File system simulation can help to predict the performance of new system designs. It offers the advantages of the flexibility of modeling and the cost and time savings of utilizing simulation instead of full implementation. Being able to predict end-to-end file system performance against a pre-defined workload can help system designers to make decisions that could affect their entire product line, involving several million dollars of investment. This dissertation presents detailed simulation-based performance models of the Linux ext3 file system and the PVFS parallel file system. The models are developed …
Development Of An Inverse Liquid Chromatographic Technique To Measure Adsorption Of Amino Acid Sorbates Onto Chitosan, Yamama Hafeez
Development Of An Inverse Liquid Chromatographic Technique To Measure Adsorption Of Amino Acid Sorbates Onto Chitosan, Yamama Hafeez
Biological and Agricultural Engineering Undergraduate Honors Theses
Drug delivery is described as the localized sustained delivery of a pharmaceutical agent to the systemic blood circulation and hence to the site of action to produce a desired pharmacological effect [1]. There are three principle ways of drug delivery, first being the injection of the drug loaded on microspheres in this method of drug delivery, microspheres are formed using a combination of ink-jet technology and single emulsion-solvent evaporation techniques. Microspheres of a certain size are produced such as to administer the desired route of administration and the rate of the drug release [1]. Another form of drug delivery commonly …
Effects Of Piston Uplift, Piston Friction, And Machine Deflection In Reduced Triaxial Extension Testing, Morgan Race
Effects Of Piston Uplift, Piston Friction, And Machine Deflection In Reduced Triaxial Extension Testing, Morgan Race
Civil Engineering Undergraduate Honors Theses
A series of Reduced Triaxial Extension (RTE) tests were conducted on dummy (brass) and null (water) samples to determine the effects of (corrections required for) piston uplift, piston friction and system compliance associated with RTE tests. During the consolidation stage of RTE tests, the sample may be consolidated in isotropic or anisotropic stress conditions. During the shearing stage of an RTE test, the sample is unloaded in the axial direction by decreasing the deviator stress while the radial stress remains constant. Ten (10) tests were conducted on a brass "dummy" sample. The device was assembled in the same manner as …
An Expressive Vocal Midi Controller, Brady Hurlburt
An Expressive Vocal Midi Controller, Brady Hurlburt
Electrical Engineering Undergraduate Honors Theses
The choice of controller often characterizes the performance obtained from an electronic instrument. Controllers exist that allow electronic musicians to mimic the expressive qualities of keyboard, wind, string, and percussion instruments, but vocalists have been largely neglected. To fill this need, a realtime software vocal MIDI controller named Grove is developed and demonstrated. Grove's pitch and time analyses are shown to be accurate, and it has mappable control signals that go beyond the capabilities of previous audio-to-MIDI converters to facilitate an expressive performance. Grove's source code is available under the GNU GPL v3 license.
Reducing Energy Usage Of Null Convention Logic Circuits Using Null Cycle Reduction Combined With Supply Voltage Scaling, Brett Sparkman
Reducing Energy Usage Of Null Convention Logic Circuits Using Null Cycle Reduction Combined With Supply Voltage Scaling, Brett Sparkman
Electrical Engineering Undergraduate Honors Theses
The NULL Cycle Reduction (NCR) technique can be used to improve the performance of the NULL Convention Logic (NCL) circuit at the expense of power and area. However, by decreasing the supply voltage of certain components, the power of the NCR circuit can be reduced. Since NCR has increased performance, it could be possible to decrease the power while maintaining the original performance of the circuit. To verify this, the NCR circuit will be implemented using a 4-bit by 4-bit dual-rail multiplier as the test circuit. This circuit will be simulated in ModelSim to ensure functionality, synthesized into a Verilog …
New Interfacial Nanochemistry On Sensory Bioscaffold-Membranes Of Nanobelts, Feng Chen
New Interfacial Nanochemistry On Sensory Bioscaffold-Membranes Of Nanobelts, Feng Chen
Graduate Theses and Dissertations
Nanostructured bioscaffolds and biosensors are evolving as popular and powerful tools in life science and biotechnology, due to the possible control of their surface and structural properties at the nm-scale. Being seldom discussed in literature and long-underexploited in materials and biomedical sciences, development of nanofiber-based sensory bioscaffolds has great promises and grand challenges in finding an ideal platform for low-cost quantifications of biological and chemical species in real-time, label-free, and ultrasensitive fashion. In this study, titanate nanobelts were first of all synthesized, from hydrothermal reactions of a NaOH (or KOH solution) with TiO2 powder, to possess underexploited structure and surface …
Enhancing The Differentiation Efficiency Of Human Embryonic Stem Cells Into Insulin-Secreting β-Cells, Katherine Rutledge
Enhancing The Differentiation Efficiency Of Human Embryonic Stem Cells Into Insulin-Secreting β-Cells, Katherine Rutledge
Biological and Agricultural Engineering Undergraduate Honors Theses
Recent studies have shown that human embryonic stem cells possess the ability to differentiate into almost any cell type in the bod and they can self-renew in culture conditions (Baetge, D'Amour et al. 26). As the number of Americans with Type 1 Diabetes continues to increase, innovative methods of treating this chronic illness must be developed in order to improve the quality of life for the affected individuals. Human embryonic stem cells (hESCs) have shown the potential to differentiate successfully into insulin-secreting β-cells, and these cultured β-cells can be used for cell-treatment therapies to replace the deficient β-cells in diabetes …
Generation Of Human Ips Cells Using Direct Reprogramming Proteins, Nick Blazic
Generation Of Human Ips Cells Using Direct Reprogramming Proteins, Nick Blazic
Biological and Agricultural Engineering Undergraduate Honors Theses
No abstract provided.
Plasmonic Effect On The Photoluminescence Of Inas Quantum Dot Nanostructures, David Fryauf
Plasmonic Effect On The Photoluminescence Of Inas Quantum Dot Nanostructures, David Fryauf
Electrical Engineering Undergraduate Honors Theses
New materials for thin film photovoltaic applications are being explored worldwide, and one of the most popular new implementations is the introduction of an intermediate band gap in the semiconductor energy structure. Careful manipulation of semiconductor lattice material can form nanostructures such as quantum dots, which can be tuned to control specific intermediate energy levels. The introduction of an intermediate band in photovoltaic devices has a theoretical potential sunlight-toelectricity efficiency of roughly 63%. However, a specific material challenge of these thin film devices is limited absorption of long wavelengths of light. To increase absorption of the sun's visible spectrum, plasmonic …
Showcase For The Advantages Of Asynchronous Vs. Synchronous Circuits, Justin Roark
Showcase For The Advantages Of Asynchronous Vs. Synchronous Circuits, Justin Roark
Electrical Engineering Undergraduate Honors Theses
Synchronous circuits dominate the semiconductor industry, but asynchronous circuitry is becoming more popular and will continue to do so, as evidenced by the International Technology Roadmap for Semiconductors. Asynchronous circuits, when compared to synchronous circuits, display tolerance to supply voltage and temperature variation. The goal of this project is to demonstrate these two advantages. The project will compare two microcontrollers, a synchronous 8051 and an asynchronous 8031, which will both play a song under various stresses. Note that an 8031 and 8051 are the same, except for the 8051 includes an on-chip instruction memory, whereas the 8031's is off-chip. When …
L'Oreal Waste Minimization, Caitlin Burns, Joe Baugh, Allen Busick, Ryan Black, Emily Evans, Matthew Margis
L'Oreal Waste Minimization, Caitlin Burns, Joe Baugh, Allen Busick, Ryan Black, Emily Evans, Matthew Margis
Chemical Engineering Undergraduate Honors Theses
No abstract provided.
Modification Of Pathways With Pseudomonas For The Extraction And Subsequent Conversion Of Algae To Butanol, Danielle Frechette
Modification Of Pathways With Pseudomonas For The Extraction And Subsequent Conversion Of Algae To Butanol, Danielle Frechette
Biological and Agricultural Engineering Undergraduate Honors Theses
As the demand for alternative fuels steadily increases, algae continue to be an excellent source for the development of biofuels. While algae have exhibited substantial potential for butanol production, there are limitations when it comes to the extraction process-its inability to withdraw oils and sugars usable for fermentation from cell walls. The genes of two bacteria were combined, creating a new organism that can both extract sugars and oils from algal cell walls and create butanol, simplifying the fermentation process while increasing efficiency. Pseudomonas flourescens, an obligate aerobe, has been shown in literature to degrade these cell walls to make …
Two Dimensional Modeling Of Wind Effects On A Bridge Section Using Finite Difference Method, Jessica Carreiro
Two Dimensional Modeling Of Wind Effects On A Bridge Section Using Finite Difference Method, Jessica Carreiro
Civil Engineering Undergraduate Honors Theses
Wind effects on long span bridges are a major concern for bridge design. Wind acts as a dynamic load on the bridge deck causing the bridge to react in ways not accounted for in static load design. Attention to these effects increased tremendously after famous bridge collapses, such as the Tacoma Narrows Bridge in 1940. Due to this collapse and others, engineers were made painfully aware that wind phenomena, such as flutter and vortex shedding, can cause major structural damage if not considered in the design process. The solution for many years since has been to conduct wind tunnel tests …
Parallelizing Scale Invariant Feature Transform On A Distributed Memory Cluster, Stanislav Bobovych
Parallelizing Scale Invariant Feature Transform On A Distributed Memory Cluster, Stanislav Bobovych
Inquiry: The University of Arkansas Undergraduate Research Journal
Scale Invariant Feature Transform (SIFT) is a computer vision algorithm that is widely-used to extract features from images. We explored accelerating an existing implementation of this algorithm with message passing in order to analyze large data sets. We successfully tested two approaches to data decomposition in order to parallelize SIFT on a distributed memory cluster.
Design, Fabrication, And Testing Of An Electrospinning Apparatus For The Deposition Of Pmma Polymer For Biomedical Applications, Harsha Malshe
Design, Fabrication, And Testing Of An Electrospinning Apparatus For The Deposition Of Pmma Polymer For Biomedical Applications, Harsha Malshe
Inquiry: The University of Arkansas Undergraduate Research Journal
This paper describes the successful design and fabrication of a deposition system for synthesis and assembly of nanoscale and submicron sized fibers of poly(methylmethacrylate)(PMMA) polymer. To optimize the electrospinning deposition process, the distance between the needle and the electrically grounded substrate, the applied voltage, and the concentration of PMMA polymer in the solution were varied. PMMA fibers as small as 500 nanometers were observed using scanning electron microscopy (SEM). The chemical signature of PMMA was confirmed for best quality and retention of chemistry using Fourier Transformed Infrared spectroscopy (FT-IR). PMMA is a biocompatible polymer, and nanofibers of PMMA are key …