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Articles 1 - 30 of 95
Full-Text Articles in Entire DC Network
Simulation Model To Investigate Flexible Workload Management For Healthcare And Servicescape Environment, Michael Thorwarth, Paul Harper, Amr Arisha
Simulation Model To Investigate Flexible Workload Management For Healthcare And Servicescape Environment, Michael Thorwarth, Paul Harper, Amr Arisha
Conference papers
High demand and poor staffing conditions cause avoidable pressure and stress among healthcare personnel which results in burnout symptoms and unplanned absenteeism which are hidden cost drivers. The work environment within an emergency department is commonly arranged in a flexible workload which is highly dynamic and complex for the outside observer. Using detailed simulation modeling within structured modeling methods, a comprehensive model to characterize the nurses' time utilization in such flexible dynamic workload environment was investigated. The results have been used to derive a generalized analytic expression that describes certain settings that lead to an instable queuing system with serious …
Development Of A Methodology For Numerical Simulation Of A D C Arc Discharge In A Liquid Dielectric, Christopher James Lewis
Development Of A Methodology For Numerical Simulation Of A D C Arc Discharge In A Liquid Dielectric, Christopher James Lewis
Theses and Dissertations
The majority of literature regarding the numerical simulation of arc discharges in gaseous environments has used a plasma physics approach. Virtually all simulations treat the discharge as an idealized gaseous plasma, which can be described by temperature, pressure, and electric field. This approach can work well if the media is a shielding gas such as Argon; however, the approach does not work well for processes such as underwater welding, EDM, and underwater discharges used to generate high purity particles. The reason these discharges do not have many extensive simulation efforts as described in the literature is because they occur in …
Prediction Of Fluid Viscosity Through Transient Molecular Dynamic Simulations, Jason Christopher Thomas
Prediction Of Fluid Viscosity Through Transient Molecular Dynamic Simulations, Jason Christopher Thomas
Theses and Dissertations
A novel method of calculating viscosity from molecular dynamics simulations is developed, benchmarked, and tested. The technique is a transient method which has the potential to reduce CPU requirements for many conditions. An initial sinusoidal velocity profile is overlaid upon the peculiar velocities of the individual molecules in an equilibrated simulation. The transient relaxation of this initial velocity profile is then compared to the corresponding analytical solution of the momentum equation by adjusting the viscosity-related parameters in the constitutive equation that relate the shear rate to the stress tensor. The newly developed Transient Molecular Dynamics (TMD) method was tested for …
Biological Simulations And Biologically Inspired Adaptive Systems, Edgar Alfredo Duenez-Guzman
Biological Simulations And Biologically Inspired Adaptive Systems, Edgar Alfredo Duenez-Guzman
Doctoral Dissertations
Many of the most challenging problems in modern science lie at the interface of several fields. To study these problems, there is a pressing need for trans-disciplinary research incorporating computational and mathematical models. This dissertation presents a selection of new computational and mathematical techniques applied to biological simulations and problem solving: (i) The dynamics of alliance formation in primates are studied using a continuous time individual-based model. It is observed that increasing the cognitive abilities of individuals stabilizes alliances in a phase transition-like manner. Moreover, with strong cultural transmission an egalitarian regime is established in a few generations. (ii) A …
Modeling The Effects Of Pelleting On The Logistics Of Distillers Grains Shipping, Kurt A. Rosentrater, Elif Kongar
Modeling The Effects Of Pelleting On The Logistics Of Distillers Grains Shipping, Kurt A. Rosentrater, Elif Kongar
Kurt A. Rosentrater
The energy security needs of energy importing nations continue to escalate. It is clear that biofuels can help meet some of the increasing need for energy. Theoretically, these can be produced from a variety of biological materials, including agricultural residues (such as corn stover and wheat straw), perennial grasses, legumes, algae, and other biological materials. Currently, however, the most heavily utilized material is corn starch. Industrial fuel ethanol production in the US primarily uses corn, because it is readily converted into fuel at a relatively low cost compared to other biomass sources. The production of corn-based ethanol in the US …
Stochastic Analysis Of Electrostatic Mems Subjected To Parameter Variations, Nitin Agarwal, Narayana R. Aluru
Stochastic Analysis Of Electrostatic Mems Subjected To Parameter Variations, Nitin Agarwal, Narayana R. Aluru
PRISM: NNSA Center for Prediction of Reliability, Integrity and Survivability of Microsystems
This paper presents an efficient stochastic framework for quantifying the effect of stochastic variations in various design parameters such as material properties, geometrical features, and/or operating conditions on the performance of electrostatic microelectromechanical systems (MEMS) devices. The stochastic framework treats uncertainty as a separate dimension, in addition to space and time, and seeks to approximate the stochastic dependent variables using sparse grid interpolation in the multidimensional random space. This approach can be effectively used to compute important information, such as moments (mean and variance), failure probabilities, and sensitivities with respect to design variables, regarding relevant quantities of interest. The approach …
Computational Investigations Of Characteristic Performance Improvements For Subkilogram Laser Micropropulsion, Richard Joel Thompson
Computational Investigations Of Characteristic Performance Improvements For Subkilogram Laser Micropropulsion, Richard Joel Thompson
Masters Theses
Experimental investigations have evaluated the feasibility of using laser-driven plasma microthrusters for small-thrust, high-specific-impulse space maneuvers, particularly for micro- and nanosatellite missions. Recent work made use of the Mach2 hydromagnetics code for the construction of an adequate computational model of the micro-thruster opera- tion. This thesis expounds on this previous work by extending the computational modeling capabilities, allowing for the determination of plasma plume properties and characteristic performance assessment of the microthruster; this allows for further computational investi- gation of the performance improvements achieved by new design considerations. Two par- ticular design changes are implemented and measured: (i) the simulation …
Probabilistic Remediation Evaluation Model For Chlorinated Solvents Considering Uncertainty, Hailian Liang
Probabilistic Remediation Evaluation Model For Chlorinated Solvents Considering Uncertainty, Hailian Liang
All Dissertations
The complex processes and expensive costs of source and plume remediation of dense, non-aqueous phase liquid (DNAPL) complicate the decision-making process for site remediation. Selection of remediation alternatives has been a big challenge due to the lack of tools that simultaneously evaluate the effectiveness of source and plume remediation and access the uncertainties in all major parameters. In this research, a new probabilistic remediation model, Probabilistic Remediation Evaluation Model for Chlorinated solvents sites (PREMChlor), has been developed. This is achieved through linking the analytical model REMChlor to a Monte Carlo modeling simulation package GoldSim via a FORTRAN Dynamic Link Library …
Comparing Cognitive Decision Models Of Iowa Gambling Task In Indivituals Following Temporal Lobectomy, Jenny Vennukkah Jeyarajah
Comparing Cognitive Decision Models Of Iowa Gambling Task In Indivituals Following Temporal Lobectomy, Jenny Vennukkah Jeyarajah
Mathematics Theses
This study examined the theoretical basis for decision making behavior of patients with right or left temporal lobectomy and a control group when they participated in the Iowa Gambling Task. Two cognitive decision models, Expectancy Valence Model and Strategy Switching Heuristic Choice Model, were compared for best fit. The best fitting model was then chosen to provide the basis for parameter estimation (sources of decision making, i.e. cognitive, motivational, and response processes) and interpretation. Both models outperformed the baseline model. However comparison of G2 means between the two cognitive decision models showed the expectancy valence model having a higher mean …
Growth Models For Tropical Forests: A Synthesis Of Models And Methods, Jerome K. Vanclay
Growth Models For Tropical Forests: A Synthesis Of Models And Methods, Jerome K. Vanclay
Professor Jerome K Vanclay
Tropical forests may have many species, indeterminate ages, and a wide range of growth habits and stem sizes and thus require special modeling techniques. But technique contributes only part of model quality, and much depends on the calibration data and access to the model. Whole stand models have limited utility in these forests, as it is hard to describe the forest adequately with few stand-level variables. Stand table projection and matrix models may be useful where summarized data are available and computer resources are limited, but the many classes required detract from the method. Tree list models offer greater flexibility, …
Assessing Trends: Monte Carlo Trials With Four Different Regression Methods, Daniel R. Thompson
Assessing Trends: Monte Carlo Trials With Four Different Regression Methods, Daniel R. Thompson
Journal of Modern Applied Statistical Methods
Ordinary Least Squares (OLS), Poisson, Negative Binomial, and Quasi-Poisson Regression methods were assessed for testing the statistical significance of a trend by performing 10,000 simulations. The Poisson method should be used when data follow a Poisson distribution. The other methods should be used when data follow a normal distribution.
Application Of The Truncated Skew Laplace Probability Distribution In Maintenance System, Gokarna R. Aryal, Chris P. Tsokos
Application Of The Truncated Skew Laplace Probability Distribution In Maintenance System, Gokarna R. Aryal, Chris P. Tsokos
Journal of Modern Applied Statistical Methods
A random variable X is said to have the skew-Laplace probability distribution if its pdf is given by f(x) = 2g(x)G(λx), where g (.) and G (.), respectively, denote the pdf and the cdf of the Laplace distribution. When the skew Laplace distribution is truncated on the left at 0 it is called it the truncated skew Laplace (TSL) distribution. This article provides a comparison of TSL distribution with twoparameter gamma model and the hypoexponential model, and an application of the subject model in maintenance system is studied.
Dynamic Load Balancing For I/O-Intensive Applications On Clusters, Xiao Qin, Hong Jiang, Adam Manzanares, Xiaojun Ruan, Shu Yin
Dynamic Load Balancing For I/O-Intensive Applications On Clusters, Xiao Qin, Hong Jiang, Adam Manzanares, Xiaojun Ruan, Shu Yin
School of Computing: Faculty Publications
Load balancing for clusters has been investigated extensively, mainly focusing on the effective usage of global CPU and memory resources. However, previous CPU- or memory-centric load balancing schemes suffer significant performance drop under I/O-intensive workloads due to the imbalance of I/O load. To solve this problem, we propose two simple yet effective I/O-aware load-balancing schemes for two types of clusters: (1) homogeneous clusters where nodes are identical and (2) heterogeneous clusters, which are comprised of a variety of nodes with different performance characteristics in computing power, memory capacity, and disk speed. In addition to assigning I/O-intensive sequential and parallel jobs …
The Impact Of A Simulation Based Leader Development Training Program On Transformational And Transactional Leadership Behavior, Robin Louise Mccoy Phd
The Impact Of A Simulation Based Leader Development Training Program On Transformational And Transactional Leadership Behavior, Robin Louise Mccoy Phd
Dissertations
Organizations devote considerable resources developing employees' capacity for leadership because they believe that "leaders" are essential in the operations of their organizations. Unfortunately, organizations do not have the time or resources to send their employees off for lengthy leader development training programs. This has contributed to the growing popularity of short-term training programs which are relatively inexpensive to conduct. However, researchers are increasingly requesting more empirical studies that examine the impact of these programs, yet these requests have remained largely disregarded. Additionally, there is a lack for developing methodologies to determine whether or not involvement in a short-term program facilitates …
Smooth Flexible Models Of Nonhomogeneous Poisson Processes Fit To One Or More Process Realizations, Shalaka C. Deo
Smooth Flexible Models Of Nonhomogeneous Poisson Processes Fit To One Or More Process Realizations, Shalaka C. Deo
Theses
Simulation is a technique of creating representations or models of real world systems or processes and conducting experiments to predict behavior of actual systems. Input modeling is a critical aspect of simulation modeling. Stochastic input models are used to model various aspects of the system under uncertainty including process times and interarrival times. This research focuses on input models for nonstationary arrival processes that can be represented as nonhomogeneous Poisson processes (NHPPs). In particular, a smooth flexible model for the mean-value function (or integrated rate function) of a general NHPP is estimated. To represent the mean-value function, the method utilizes …
Why Model Landscapes At The Level Of Households And Fields?, Jerome K. Vanclay
Why Model Landscapes At The Level Of Households And Fields?, Jerome K. Vanclay
Professor Jerome K Vanclay
Sustainable resource management relies upon many disciplines and deals with complex interactions at the landscape scale. Many of the issues at the landscape scale arise from decisions taken at the household level and affect land use in fields and in small patches of forest. Spatially-explicit modelling of these units is desirable because it enables rigorous testing of model predictions, and thus of underlying propositions. The greatest insights may be obtained by participatory modelling of these processes as we understand them. Despite this, few models simulate dynamics at the household and field level. FLORES, the Forest Land Oriented Resource Envisioning System, …
Evaluating The Performance Of Propensity Scores To Address Selection Bias In A Multilevel Context: A Monte Carlo Simulation Study And Application Using A National Dataset, Jeremy Andrew Lingle
Evaluating The Performance Of Propensity Scores To Address Selection Bias In A Multilevel Context: A Monte Carlo Simulation Study And Application Using A National Dataset, Jeremy Andrew Lingle
Educational Policy Studies Dissertations
When researchers are unable to randomly assign students to treatment conditions, selection bias is introduced into the estimates of treatment effects. Random assignment to treatment conditions, which has historically been the scientific benchmark for causal inference, is often impossible or unethical to implement in educational systems. For example, researchers cannot deny services to those who stand to gain from participation in an academic program. Additionally, students select into a particular treatment group through processes that are impossible to control, such as those that result in a child dropping-out of high school or attending a resource-starved school. Propensity score methods provide …
Drinking Water Optimum Supply System (Dwoss) Through The Application Of Advanced Technologies, Praveen Jha Dr
Drinking Water Optimum Supply System (Dwoss) Through The Application Of Advanced Technologies, Praveen Jha Dr
Praveen Jha Dr
Paradigm shift in the approach for planning regarding supply of drinking water is mandatory since the current DPRs are unscientific and expensive. Planning for an optimum Drinking Water Supply System (ODWSS) that includes - optimization of Water Source Point (WSP), Water Treatment System (WTS), Water Storage Systems (WSSs), Water Distribution Points (WDP) and Water Supply Network (WSN); scientific estimation of long term demand of drinking water; minimization of physical and financial resources required for the plan implementation; water conservation and sanitation – could be done by applying several state-of-art geo-spatial programs developed by the author. Three programs - Multi-Algorithm Automation …
Course Portfolio - Discrete Event Simulation, Paul Savory
Course Portfolio - Discrete Event Simulation, Paul Savory
Department of Industrial and Management Systems Engineering: Faculty Publications
This course portfolio, written by Dr. Paul Savory, provides an overview of his Discrete Event Simulation course at the University of Nebraska-Lincoln. It offers an overview of the course goals, a summary of the classroom activities for achieving them, and a detailed assessment of student learning. He highlights his introduction of the simul8 programming environment to his students. In addition to exploring his students’ learning, Dr. Savory also explores different approaches for documenting his teaching by including multimedia clips (video and audio), uses graphs, uses color, and incorporates images. The resulting portfolio is one that can be reviewed, shared, and …
Genes And Symptoms Of Schizophrenia: Modifiers, Networks, And Interactions In Complex Disease, Sarah Bergen
Genes And Symptoms Of Schizophrenia: Modifiers, Networks, And Interactions In Complex Disease, Sarah Bergen
Theses and Dissertations
Understanding the genetic foundations of schizophrenia and the resultant symptom manifestations is an important step as we work toward development of new prevention and treatment strategies. This work has sought better understanding of this disease through use of three subject cohorts and two studies using simulated data exploring features of complex disease. First, we probed the symptoms of schizophrenia in subjects of African and European ancestry drawn from the Genetic Association Information Network (GAIN) schizophrenia study and found significant differences between groups, particularly in affective symptoms. The genetic basis of symptom variation was then explored in a selection of candidate …
Designing A Simulation For Student Evaluation Using Scriven's Key Evaluation Checklist, Shelly Jensen Reed
Designing A Simulation For Student Evaluation Using Scriven's Key Evaluation Checklist, Shelly Jensen Reed
Faculty Publications
Human patient simulation use has increased dramatically in nursing education over the past 10 years, with many benefits. One advantage is that it allows students to learn by practicing skills in a risk-free environment, with immediate faculty feedback. Another benefit is that it prepares and ensures the competence of student nurses, leading to improved patient safety outcomes. Student opinions gathered in a survey of nursing schools and simulator centers favored use of competency evaluation using simulation in at least some circumstances. As little research concerning use of simulation to evaluate student competency can be found, an established guide such as …
The Impact Of Simulation In Nursing Education On The Self-Efficacy And Learner Satisfaction Of Nursing Students, Rosalie E. Tuttle
The Impact Of Simulation In Nursing Education On The Self-Efficacy And Learner Satisfaction Of Nursing Students, Rosalie E. Tuttle
Faculty Scholarship – Nursing
Nursing education faces the challenge of preparing graduates to face the complexities that are found in today’s health care environment. Upon graduation, new nurses must be able to care for patients in a fast-paced environment that emphasizes clinical competence and accurate, timely decision-making skills. Self-efficacy is a characteristic that is believed to increase an individual’s ability to be successful at a task. The purpose of this study was to evaluate the use of simulation to impact the development of clinical self-efficacy in junior- and senior-level nursing students at a Midwestern liberal arts university. This study also evaluated student satisfaction with …
Preliminary Modelling Results For An Otto Cycle/Stirling Cycle Hybrid-Engine-Based Power Generation System, Barry Cullen, Jim Mcgovern, Michel Feidt, Stoian Petrescu
Preliminary Modelling Results For An Otto Cycle/Stirling Cycle Hybrid-Engine-Based Power Generation System, Barry Cullen, Jim Mcgovern, Michel Feidt, Stoian Petrescu
Conference Papers
This paper presents preliminary data and results for a system mathematical model for a proposed Otto Cycle / Stirling Cycle hybrid-engine-based power generation system. The system is a combined cycle system with the Stirling cycle machine operating as a bottoming cycle on the Otto cycle exhaust. The application considered is that of a stationary power generation scenario wherein the Stirling cycle engine operates as a waste heat recovery device on the exhaust stream of the Otto cycle engine. This paper is primarily concerned with the development of a model for a suitable Stirling cycle engine capable of running on the …
What Law Schools Should Teach Future Transactional Lawyers: Perspectives From Practice, Michael A. Woronoff
What Law Schools Should Teach Future Transactional Lawyers: Perspectives From Practice, Michael A. Woronoff
Michael A Woronoff
Since at least the 1980’s, law schools have been chided for doing a poor job at teaching skills. This criticism has been accompanied by pressure to increase their emphasis on skills training. The pressure increased with the publication of the McCrate Report in 1992, and then again with the publication of the Carnegie Report in 2007. This article is based on my remarks given on June 10 at the 2009 mid-year meeting of the AALS Conference on Business Associations. In those remarks, I respond to the questions “Are law schools teaching students adequate transactional skills?” and “From the standpoint of …
Geographic Variation In Potential Of Residential Solar Hot Water System Performance In The United States, Florida Solar Energy Center, Camilo Gil
Geographic Variation In Potential Of Residential Solar Hot Water System Performance In The United States, Florida Solar Energy Center, Camilo Gil
FSEC Energy Research Center®
This paper describes an assessment of residential solar water heater performance around the continental United States. We performed annual simulations using an hourly simulation model (EGUSA) for 212 TMY3 weather locations around the nation. The annual simulations show how standard hot water energy use for electric and gas systems vary geographically (kWh and therms) as well as the potential energy savings from solar water heaters. A key finding is that the energy necessary for water heating varies by 2:1 around the U.S. with implications for solar water heating system design and sizing. Our results provide information on expected water heater …
The University Clinical Skills And Simulation Center: A Jefferson Gem Part Ii
The University Clinical Skills And Simulation Center: A Jefferson Gem Part Ii
Population Health Matters (Formerly Health Policy Newsletter)
No abstract provided.
Improving Ad-Hoc Team Performance Using Video Games, Jeff David Craighead
Improving Ad-Hoc Team Performance Using Video Games, Jeff David Craighead
USF Tampa Graduate Theses and Dissertations
This dissertation examined the effects of distributed, multiplayer training video games on the performance of distributed teams of robot operators. Two hypotheses were tested, the first hypothesis stated that online, game-based team training will improve the performance of an ad-hoc team versus an ad-hoc team formed of individually trained teammates. The second hypothesis stated that the fractal dimension of a robot's path can be used as an indicator of its operator's skill. Forty-one volunteers participated in an experiment in which they played a distributed, online training game which showed them the basics of operating an Inuktun Extreme VGTV for a …
Using Rfid To Overcome Inventory Control Challenges: A Proof Of Concept, Dane Hamilton, Katina Michael, Samuel Fosso Wamba
Using Rfid To Overcome Inventory Control Challenges: A Proof Of Concept, Dane Hamilton, Katina Michael, Samuel Fosso Wamba
Dr Samuel Fosso Wamba
Using a Proof of Concept approach, this paper examines RFID’s impact on inventory control of a small-to-medium retailer. Results indicate that RFID technology can function effectively in a small-to-medium hardware environment. Also, the majority of the simulations recorded reasonable read rates even though the simulations were set up over a short period of time without a great deal of fine-tuning. Moreover, RFID could have a positive impact on the inventory-related processes of the organisation by either streamlining or formalizing them and facilitate the electronic storage of information captured in real-time, relating to the movement of stock and the amount of …
Using Rfid To Overcome Inventory Control Challenges: A Proof Of Concept, Dane Hamilton, Katina Michael, Samuel Fosso Wamba
Using Rfid To Overcome Inventory Control Challenges: A Proof Of Concept, Dane Hamilton, Katina Michael, Samuel Fosso Wamba
Professor Katina Michael
Using a Proof of Concept approach, this paper examines RFID’s impact on inventory control of a small-to-medium retailer. Results indicate that RFID technology can function effectively in a small-to-medium hardware environment. Also, the majority of the simulations recorded reasonable read rates even though the simulations were set up over a short period of time without a great deal of fine-tuning. Moreover, RFID could have a positive impact on the inventory-related processes of the organisation by either streamlining or formalizing them and facilitate the electronic storage of information captured in real-time, relating to the movement of stock and the amount of …
Simulation Modeling Of Electronic Health Records Adoption In The U.S. Healthcare System, Nadiye O. Erdil, C. Robert Emerson
Simulation Modeling Of Electronic Health Records Adoption In The U.S. Healthcare System, Nadiye O. Erdil, C. Robert Emerson
Engineering and Applied Science Education Faculty Publications
Increasing the efficiency of the healthcare system in the United States is an important subject due to rapidly rising costs. Among many propositions to improve the operation of the system, adoption of Electronic Health Records is widely discussed. This study uses a system dynamics methodology to develop a simulation model of the adoption process that will allow for the exploration of policies. This paper presents the development and the preliminary findings of this model.