Entire DC Network | Open Access Articles | Digital Commons Network™

Access|Closure Balloon Catheter Redesign Project, Keenan Bamburg, Yvette Castillo, Elizabeth Eskildsen

Mechanical Engineering

No abstract provided.

Go to article

Strider, George Cummings, Brian Kreidle, Ricky Lee, Clark Steen

Mechanical Engineering

No abstract provided.

Go to article

Beyond Lean: Simulation In Practice, Charles R. Standridge Ph.D.

Open Textbooks

Lean thinking, as well as associated processes and tools, have involved into a ubiquitous perspective for improving systems particularly in the manufacturing arena. With application experience has come an understanding of the boundaries of lean capabilities and the benefits of getting beyond these boundaries to further improve performance. Discrete event simulation is recognized as one beyond-the-boundaries of lean technique. Thus, the fundamental goal of this text is to show how discrete event simulation can be used in addition to lean thinking to achieve greater benefits in system improvement than with lean alone. Realizing this goal requires learning the problems that …

Go to article

Influence Of Warm Mix Additives Upon High Rap Asphalt Mixes, William Rogers

All Dissertations

This study was conducted to determine the effect of warm mix (WMA) modifiers on asphalt mixes containing high percentages of reclaimed asphalt pavement (RAP). Mixes were created using three aggregate sources, four RAP percentages (0%, 20%, 35%, and 50%), and three warm mix modifiers (HMA, zeolite, and Sasobit®). Base binders from the same source (PG 64 -22, 58 -28, 52 -28) and one rejuvenator were used for each mix to ensure the final blended binder grade was at least PG 64 -10.
Specimens were created at HMA or suggested WMA temperatures and tested for rut depth, indirect tensile strength (ITS), …

Go to article

Early Forest Fire Detection In The Spectral Domain, Dennis Keyes

Electrical Engineering

No abstract provided.

Go to article

Energy Harvesting Bicycle, Michael Hui

Electrical Engineering

No abstract provided.

Go to article

Activity And Rumination Monitoring For Calving Times, David Weststeyn

Dairy Science

No abstract provided.

Go to article

Protein Trap Lines Of Drosophila To Demonstrate Spatio-Temporal Localization Of Proteins In An Undergraduate Lab, Oorvashi Roy Puli, Amit Singh

Biology Faculty Publications

The objective of this teaching note is to generate a laboratory exercise, which allows students to get a hands-on experience of a cell biology technique. The short duration of the laboratory classes is the biggest challenge with the development of a cell biology lab for an undergraduate curriculum. Therefore, it is necessary to design a laboratory exercise that enables the students to carry out cell biological assays in the desired time. This laboratory exercise focuses on tracking protein expression levels along a spatial (space) and temporal (time) axis in developing Drosophila melanogaster organ primordium. Here we use the protein trap …

Go to article

Vortex Tilting And The Enhancement Of Spanwise Flow In Flapping Wing Flight, Spencer Frank

HIM 1990-2015

In summary the tilting mechanism helps to explain the overall flow structure and the stability of the leading edge vortex.; The leading edge vortex has been identified as the most critical flow structure for producing lift in flapping wing flight. Its stability depends on the transport of the entrained vorticity into the wake via spanwise flow. This study proposes a hypothesis for the generation and enhancement of spanwise flow based on the chordwise vorticity that results from the tilting of the leading edge vortex and trailing edge vortex. We investigate this phenomenon using dynamically scaled robotic model wings. Two different …

Go to article

Investigation On Interactions Of Unsteady Wakes And Film Cooling On An Annular Endwall, Matthew J. Golsen

HIM 1990-2015

In recent decades, greater interest in the effect of rotational wakes on gas turbine film cooling applications has produced increasing numbers of studies on these unsteady phenomena. Wakes are primarily shed from upstream components such as transition duct walls, stator vanes, and rotors. Studies have shown that in areas of unsteady flow, the best performing parameters in conventional steady investigations may not be the best for unsteady applications. One common method of modeling the unsteady wake interaction in subsonic flows is the use of spoke wheel type wake generators using cylindrical rods to produce the velocity detriment and local increase …

Go to article

Context-Driven Agents In Computer Supported Cooperative Works, Brian D. Lichtman

HIM 1990-2015

This thesis describes a research project that investigates the level of contextualization needed to successfully build context-driven agents that can manage a cooperative project. Many times in industry, collaborators in a large project may be located vast distances from each other. It is for this reason that management of such projects can often be difficult. The purpose of this research is to design an agent that can take on the role of a project manager (PM) to assist the human project manager. Specifically, this thesis looks to give such project management agents full situational awareness. It is hypothesized that only …

Go to article

Small-Scale Hybrid Alternative Energy Maximizer For Wind Turbines And Photovoltaic Panels, Ross Kerley

HIM 1990-2015

This thesis describes the creation of a small-scale Hybrid Power System (HPS) that maximizes energy from a wind turbine and photovoltaic array. Small-scale HPS are becoming an increasingly viable energy solution as fossil fuel prices rise and more electricity is needed in remote areas. Modern HPS typically employ wind speed sensors and three power stages to extract maximum power. Modern systems also use passive rectifiers to convert AC from the wind turbine to DC that is usable by power electronics. This passive system inefficiently wastes power and introduces damaging harmonic noise to the wind turbine. The HPS described in this …

Go to article

Mare Nostrum As The Cauldron Of Western Legal Traditions: Stirring The Broth, Making Sense Of Legal Gumbo Whilst Understanding Contamination, Olivier Moréteau

Journal of Civil Law Studies

No abstract provided.

Go to article

Extract The Knowledge Structure Of Medical Problem Solving: Learning From Cognitive Science, Der-Fang Chen, Tsuen-Chiuan Tsai

Journal of Medical Education

Medical diagnosis is a central component of medical competency, while being considered a challenge for young physicians. Teaching the ways that medical experts solve clinical problems will enhance students' learning gains. However, medical problems are often dealt differently across cases, physicians, and expertise levels. In order to extract expertise from experts, this study is to review and summarize the techniques for expertise extraction in the field of cognitive science, and explored the relevancy for studying medical problem-solving. Methods: The literature and books on ”extracting expertise” in medicine or in other fields are retrieved. The expertise extraction techniques included those being …

Go to article

Problem-Based Learning Curriculum: Problems And Possible Solutions, Robert M. K. W. Lee

Journal of Medical Education

The use of problem-based learning (PBL) approach in education by medical schools around the world is still evolving based on local environmental factors, such as the willingness and ability of the teachers to adjust to this style of learning, and government regulations. In this article, I will present my personal views on the problems and challenges teachers/tutors may face in different components of a PBL medical education, and suggest some solutions or approaches PBL teachers may wish to consider in confronting or solving these problems. I will focus on lectures, tutorial process, teaching of clinical skills, and evaluation. In the …

Go to article

Students' Perception And Acceptance Of Problem-Based Learning (Pbl) In A Hybrid Traditional-Pbl Curriculum, Si Mui Sim, Lay Hoong Lian, M. S. Kanthimathi, Meow Keong Thong, Nget Hong Tan

Journal of Medical Education

Even though there are several variants in its implementation, problem-based learning (PBL) is essentially a form of student-centred learning that involves enquiry-based discussion triggered by a problem and facilitated by a tutor in small groups. In a hybrid traditional-PBL curriculum where PBL runs parallel with conventional didactic teaching, there is always a concern that such curricular arrangement may produce undesirable learning behaviour. Therefore, this paper evaluated the students' perception and acceptance of PBL in such a learning environment. PBL was introduced in a gradual manner into the first three years of a revised undergraduate medical curriculum at the University of …

Go to article

Re-Visiting The May 2008 Xenophobic Attacks In South Africa, Jephias Matunhu

African Journal of Criminology and Justice Studies

Xenophobia is a latent or obtrusive dislike of foreigners. It is anti-social and destructive of property and life. Xenophobic attacks in South Africa, which started around mid May in 2008 in the informal settlements of Alexandria claimed 62 lives. Thousands of foreigners were left homeless. What triggered the xenophobic attacks on foreigners? Better still, what can be done to stop xenophobia and xenophobic attacks in South Africa? This desktop research provides responses to these questions.

Go to article

High Temperature Thermodynamic Properties Of Znte(S), Robert F. Brebrick

Mechanical Engineering Faculty Research and Publications

We have gathered the partial pressure, Knudsen cell, and emf measurements on ZnTe(s) from which the Gibbs energy of formation can be calculated. Published partial pressures of diatomic tellurium have been adjusted to take account of a subsequently published third law analysis of tellurium. The equation used to calculate the total pressure from the rate of mass loss from an extensive set of Knudsen cell measurements has been corrected to give a 5% increase in total pressure and the Gibbs energy of formation has been recalculated. A high temperature heat capacity for ZnTe(s) has been selected from the published data. …

Go to article

Capacitance Calculation For A Shared-Antipad Via Structure Using An Integral Equation Method Based On Partial Capacitance, Hanfeng Wang, Albert E. Ruehli, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

An integral equation method used for capacitance extraction for axially symmetric geometries is extended in this paper to calculate the via-plane capacitances in shared-antipad via structures, by changing the circular ring cells to arc ones. the proposed method is validated with a commercial finite element method-based tool for a typical structure used in modern high-speed printed circuit design. © 2011 IEEE.

Go to article

E-Readiness And Entrepreneurship: A Cross Country Study Of The Link Between Technological Infrastructure And Entrepreneurial Activity, Richard L. Constand, Arthur H. Gilbert, Jr.

The Journal of Entrepreneurial Finance

This current study focuses on the relationship between a country’s e-readiness environment and entrepreneurial activities. Many government policies assume there is a direct causal relationship between e-readiness and entrepreneurial activity and some past studies have reported evidence supporting such a link. In this paper, a cross country panel data analysis using three different measures of entrepreneurial activity and different measures of e-readiness examines this relationship. The results of this study provide only weak support for the hypothesized relationship. Furthermore, the results appear to be very sensitive to the choice of proxy variables chosen to represent entrepreneurial activity and the different …

Go to article

A Review On Convolutions Of Gamma Random Variables, Baha-Eldin Khaledi, Subhash C. Kochar

Mathematics and Statistics Faculty Publications and Presentations

Due to its wide range of applications, the topic of the distribution theory of convolutions of Gamma random variables has attracted the attention of many researchers. In this paper we review some of the latest developments on this problem.

Go to article

Crew Resource Management Training For Nurse Anesthesia Education, John P. Lonneman

Theses and Dissertations

Communication encores have been identified by The Joint Commission on Accreditation of Healthcare Organization (JCAHO) as the leading cause of wrong site operations and other sentinel events (Makary et al., 2006; Neily et al., 2009). Additionally, poor teamwork in the OR results in higher morbidity and mortality (Mazzocco et al., 2009). The aviation industry has used the concepts of Crew Resource Management (CRM) for more than 20 years to reduce accidents caused by human factors (Rivers, Swain & Nixon, 2003). CRM focuses on communication, leadership, decision making and resource management to achieve safe outcomes. CRM has been shown to lower …

Go to article

Efficient Uncertainty Quantification In Multidisciplinary Analysis Of A Reusable Launch Vehicle, Benjamin R. Bettis, Serhat Hosder, Tyler Winter

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The objective of this study was to apply a recently developed uncertainty quantification framework to the multidisciplinary analysis of a reusable launch vehicle (RLV). This particular framework is capable of efficiently propagating mixed (inherent and epistemic) uncertainties through complex simulation codes. the goal of the analysis was to quantify uncertainty in various output parameters obtained from the RLV analysis, including the maximum dynamic pressure, cross-range, range, and vehicle takeoff gross weight. Three main uncertainty sources were treated in the simulations: (1) reentry angle of attack (inherent uncertainty), (2) altitude of the initial reentry point (inherent uncertainty), and (3) the Young's …

Go to article

Alternative Crankshaft Mechanisms And Kinetic Energy Recovery Systems For Improved Fuel Economy Of Light Duty Vehicles, Alberto Boretti, Houshsng Masudi, Joseph Scalzo

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The introduction of advanced internal combustion engine mechanisms and powertrains may improve the fuel conversion efficiency of an engine and thus reduce the amount of energy needed to power the vehicle. the paper presents a novel design of a variable compression ratio advanced spark ignition engine that also permits an expansion ratio that may differ from the induction stroke therefore generating an Atkinson cycle effect. the stroke ratio and the ratio of maximum to minimum in-cylinder volumes may change with load and speed to provide the best fuel conversion efficiency. the variable ratio of maximum to minimum in-cylinder volumes also …

Go to article

Simulations Of Pulse Signals With X-Parameters, Nick K.H. Huang, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Nonlinearity is becoming increasingly important to IC technologies. From the PHD formalism, X-parameter models provide an accurate frequency-domain method under large-signal operating points to characterize their nonlinear behaviors. In this work, X-parameter models are investigated to handle time-domain pulse signals which is critical to IC signal integrity but was not studied before. Two representative circuits, an analog LNA and a digital CMOS buffer, were employed to characterize the X-parameter performance. The results obtained in this paper provide the first hand data for pulse signal responses of X-parameters in signal integrity modelings. © 2011 IEEE.

Go to article

Compact Metallic Rfid Tag Antennas With A Loop-Fed Method, Peng H. Yang, Yan Li, Lijun Jiang, W. C. Chew, Terry Tao Ye

Electrical and Computer Engineering Faculty Research & Creative Works

Several compact, low profile and metal-attachable RFID tag antennas with a loop-fed method are proposed for UHF RFID systems. The structure of the proposed antennas comprise of two parts: (1) The radiator part consists of two shorted patches, which can be treated as two quarter-wave patch antennas or a cavity. (2) A small loop printed on the paper serves as the feeding structure. The small loop provides the needed inductance for the tag and is connected to the RFID chip. The input impedance of the antenna can be easily adjusted by changing loop dimensions. The antenna has the compact size …

Go to article

Improving The Efficiency Of Lpg Compression Ignition Engines For Passenger Cars Through Waste Heat Recovery, Alberto Boretti

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The turbocharged direct injection lean burn Diesel engine is the most efficient now in production for transport applications with full load brake efficiencies up to 40 to 45% and reduced penalties in brake efficiencies reducing the load by the quantity of fuel injected. the secrets of this engine's performances are the high compression ratio and the lean bulk combustion mostly diffusion controlled in addition to the partial recovery of the exhaust energy to boost the charging efficiency. the major downfalls of this engine are the carbon dioxide emissions and the depletion of fossil fuels using fossil diesel, the energy security …

Go to article

Cultivating Readiness For Professional Learning Community Through Learning Teams In A Restructuring High School, Cassandra H. Hyacinthe

Education Doctoral

The traditional organizational structure of large comprehensive high schools: departmental divisions, teacher isolation, fragmented subcultures, student alienation, and competing group interests have undermined student and adult learning and have thwarted attempts at school reform. Professional learning communities (PLCs) are a promising strategy for advancing student achievement and school reform. Schools with strong PLCs foster a collaborative culture, focus on learning, promote shared responsibility, and pursue results-oriented goals and assessments to ensure student academic gains. The study investigated the use of learning teams as a preliminary strategy for PLC and to inform school-wide PLC implementation in a restructuring high school. Wenger’s …

Go to article

Eigenvalue Distributions Of Mimo Rayleigh-Product Channels With Arbitrary-Power Co-Channel Interference And Noise, Yongpeng Wu, Shi Jin, Xiqi Gao, Chengshan Xiao, Matthew R. Mckay

Electrical and Computer Engineering Faculty Research & Creative Works

This paper studies the eigenvalue distributions of multiple-input multiple-output (MIMO) Rayleigh-product channels in the presence of both co-channel interference and thermal noise. We first present exact expressions for the marginal ordered eigenvalue distributions of the channel Gram matrix when multichannel beamforming is employed, from which we obtain exact results of the outage probability on each eigenmode. Our results apply to a wide class of multichannel systems which transmit on the eigenmodes of the MIMO channel, allowing for transmission on any numbers of eigen subchannels, with any numbers of antennas, any numbers of scatterers in the environment, and any numbers of …

Go to article

Comparison Of A Recurrent Neural Network Pv System Model With A Traditional Component-Based Pv System Model, Daniel M. Riley, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

Photovoltaic (PV) system modeling is used throughout the photovoltaic industry for the prediction of PV system output under a given set of weather conditions. PV system modeling has a wide range of uses including pre-purchase comparisons of PV system components, system health monitoring, and estimation of payback (return on investment) times. in order to adequately model a PV system, the system must be characterized to establish the relationship between given weather inputs (e.g., irradiance, spectrum, temperature) and desired system outputs (e.g., AC power, module temperature). Traditional approaches to system characterization involve characterizing and modeling each component in a PV system …

Go to article

Full-Text Articles in Entire DC Network

Access|Closure Balloon Catheter Redesign Project, Keenan Bamburg, Yvette Castillo, Elizabeth Eskildsen

Mechanical Engineering

Strider, George Cummings, Brian Kreidle, Ricky Lee, Clark Steen

Mechanical Engineering

Beyond Lean: Simulation In Practice, Charles R. Standridge Ph.D.

Open Textbooks

Influence Of Warm Mix Additives Upon High Rap Asphalt Mixes, William Rogers

All Dissertations

Early Forest Fire Detection In The Spectral Domain, Dennis Keyes

Electrical Engineering

Energy Harvesting Bicycle, Michael Hui

Electrical Engineering

Activity And Rumination Monitoring For Calving Times, David Weststeyn

Dairy Science

Protein Trap Lines Of Drosophila To Demonstrate Spatio-Temporal Localization Of Proteins In An Undergraduate Lab, Oorvashi Roy Puli, Amit Singh

Biology Faculty Publications

Vortex Tilting And The Enhancement Of Spanwise Flow In Flapping Wing Flight, Spencer Frank

HIM 1990-2015

Investigation On Interactions Of Unsteady Wakes And Film Cooling On An Annular Endwall, Matthew J. Golsen

HIM 1990-2015

Context-Driven Agents In Computer Supported Cooperative Works, Brian D. Lichtman

HIM 1990-2015

Small-Scale Hybrid Alternative Energy Maximizer For Wind Turbines And Photovoltaic Panels, Ross Kerley

HIM 1990-2015

Mare Nostrum As The Cauldron Of Western Legal Traditions: Stirring The Broth, Making Sense Of Legal Gumbo Whilst Understanding Contamination, Olivier Moréteau

Journal of Civil Law Studies

Extract The Knowledge Structure Of Medical Problem Solving: Learning From Cognitive Science, Der-Fang Chen, Tsuen-Chiuan Tsai

Journal of Medical Education

Problem-Based Learning Curriculum: Problems And Possible Solutions, Robert M. K. W. Lee

Journal of Medical Education

Students' Perception And Acceptance Of Problem-Based Learning (Pbl) In A Hybrid Traditional-Pbl Curriculum, Si Mui Sim, Lay Hoong Lian, M. S. Kanthimathi, Meow Keong Thong, Nget Hong Tan

Journal of Medical Education

Re-Visiting The May 2008 Xenophobic Attacks In South Africa, Jephias Matunhu

African Journal of Criminology and Justice Studies

High Temperature Thermodynamic Properties Of Znte(S), Robert F. Brebrick

Mechanical Engineering Faculty Research and Publications

Capacitance Calculation For A Shared-Antipad Via Structure Using An Integral Equation Method Based On Partial Capacitance, Hanfeng Wang, Albert E. Ruehli, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

E-Readiness And Entrepreneurship: A Cross Country Study Of The Link Between Technological Infrastructure And Entrepreneurial Activity, Richard L. Constand, Arthur H. Gilbert, Jr.

The Journal of Entrepreneurial Finance

A Review On Convolutions Of Gamma Random Variables, Baha-Eldin Khaledi, Subhash C. Kochar

Mathematics and Statistics Faculty Publications and Presentations

Crew Resource Management Training For Nurse Anesthesia Education, John P. Lonneman

Theses and Dissertations

Efficient Uncertainty Quantification In Multidisciplinary Analysis Of A Reusable Launch Vehicle, Benjamin R. Bettis, Serhat Hosder, Tyler Winter

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Alternative Crankshaft Mechanisms And Kinetic Energy Recovery Systems For Improved Fuel Economy Of Light Duty Vehicles, Alberto Boretti, Houshsng Masudi, Joseph Scalzo

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Simulations Of Pulse Signals With X-Parameters, Nick K.H. Huang, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Compact Metallic Rfid Tag Antennas With A Loop-Fed Method, Peng H. Yang, Yan Li, Lijun Jiang, W. C. Chew, Terry Tao Ye

Electrical and Computer Engineering Faculty Research & Creative Works

Improving The Efficiency Of Lpg Compression Ignition Engines For Passenger Cars Through Waste Heat Recovery, Alberto Boretti

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Cultivating Readiness For Professional Learning Community Through Learning Teams In A Restructuring High School, Cassandra H. Hyacinthe

Education Doctoral

Eigenvalue Distributions Of Mimo Rayleigh-Product Channels With Arbitrary-Power Co-Channel Interference And Noise, Yongpeng Wu, Shi Jin, Xiqi Gao, Chengshan Xiao, Matthew R. Mckay

Electrical and Computer Engineering Faculty Research & Creative Works

Comparison Of A Recurrent Neural Network Pv System Model With A Traditional Component-Based Pv System Model, Daniel M. Riley, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works