Works (61)

Updated: April 5th, 2024 05:52

2023 journal article

TL;DR: Scenarios remained close to reality for 22 weeks on average before the arrival of unanticipated SARS-CoV-2 variants invalidated key assumptions, and an ensemble of participating models that preserved variation between models was consistently more reliable than any single model in periods of valid scenario assumptions, while projection interval coverage was near target levels. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, ORCID
Added: February 26, 2024

2023 journal article

Quantifying association and disparities between diabetes complications and COVID-19 outcomes: A retrospective study using electronic health records

PLOS ONE, 18(9).

By: N. Paramita n, J. Agor*, M. Mayorga*, J. Ivy*, K. Miller* & O. Ozaltin*

TL;DR: The presence of diabetes complications increases the risks of COVID-19 infection, hospitalization, and worse health outcomes with respect to in-hospital mortality and longer hospital length of stay, and health disparities in CO VID-19 outcomes across demographic groups in the diabetes population are shown. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, ORCID
Added: October 30, 2023

2023 journal article

Resiliency within the Socio-Ecological System of a Large Food Bank Network: Preparing, mitigating, responding, and recovering from Hurricane Florence

INTERNATIONAL JOURNAL OF DISASTER RISK REDUCTION, 88.

author keywords: Food insecurity; Disaster relief; Supply chain resiliency; Non-profit; Social capital; Built-Back-Better
Source: Web Of Science
Added: April 4, 2023

2022 article

AN APPROACH TO POPULATION SYNTHESIS OF ENGINEERING STUDENTS FOR UNDERSTANDING DROPOUT RISK

2022 WINTER SIMULATION CONFERENCE (WSC), pp. 677–688.

By: D. Dorris n, J. Ivy n & J. Swann n

TL;DR: This work outlines an approach for creating a synthetic population of students in STEM and builds a microsimulation which simulates students' risk behaviors over time. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID
Added: September 5, 2023

2022 article

COULD EARLIER AVAILABILITY OF BOOSTERS AND PEDIATRIC VACCINES HAVE REDUCED IMPACT OF COVID-19?

2022 WINTER SIMULATION CONFERENCE (WSC), pp. 1092–1103.

By: E. Rosenstrom n, J. Ivy n, M. Mayorga n & J. Swann n

TL;DR: The results of the simulation model suggest that the timing of childhood vaccination and booster efforts could have resulted in a reduced disease burden and that prioritizing childhood vaccinations would most effectively reduce disease spread. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, ORCID
Added: September 5, 2023

2022 journal article

Checklists in Healthcare: Operational Improvement of Standards using Safety Engineering-Project CHOISSE-A framework for evaluating the effects of checklists on surgical team culture

APPLIED ERGONOMICS, 103.

By: G. Perera n, L. Hey*, K. Chen n, M. Morello n, B. McConnell n & J. Ivy n

Contributors: G. Perera n, L. Hey*, K. Chen n, M. Morello n, B. McConnell n & J. Ivy n

author keywords: Checklists; Teamwork; Surgical-safety
MeSH headings : Checklist / methods; Cohort Studies; Delivery of Health Care; Humans; Pilot Projects; Prospective Studies
TL;DR: The CHOISSE framework was applied to guide the implementation and evaluation of e-checklists on team culture for ten pilot teams across the US over a 24-week period and mixed methods analysis of the data and lessons learned were used to identify iterative improvements to the framework and to inform future studies. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (Web of Science)
Sources: Web Of Science, ORCID
Added: May 25, 2022

2022 journal article

Modeling the Impact of Nonpharmaceutical Interventions on COVID-19 Transmission in K-12 Schools

MDM POLICY & PRACTICE, 7(2).

By: Y. Zhang n, M. Mayorga n, J. Ivy n, K. Lich* & J. Swann n

author keywords: SEIR model; infectious disease; in-school testing; contact reduction; masking
TL;DR: A deterministic stratified SEIR model is developed that captures the role of social contacts in K-12 schools to estimate COVID-19 transmission under different nonpharmaceutical interventions and finds that masks and reducing contacts can greatly reduce new infections among students. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: December 3, 2022

2022 article

Optimizing the First Response to Sepsis: An Electronic Health Record-Based Markov Decision Process Model

Rosenstrom, E., Meshkinfam, S., Ivy, J. S., Goodarzi, S. H., Capan, M., Huddleston, J., & Romero-Brufau, S. (2022, July 22). DECISION ANALYSIS, Vol. 7.

author keywords: clinical decision support; sepsis treatment; electronic health records; continuous-time Markov decision process; optimal stopping problem
TL;DR: A continuous-time Markov decision process (MDP) optimal stopping model is developed that identifies the optimal first intervention action (anti-infective, fluid, or wait) and an easily interpretable initial treatment heuristic that considers a patient’s organ dysfunction, location, and septic shock status is defined. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: August 8, 2022

2022 article

Organizational decision-making during COVID-19: A qualitative analysis of the organizational decision-making system in the United States during COVID-19

Johnson, K., Biddell, C. B. B., Hecht, H. K. K., Lich, K. H. H., Swann, J., Delamater, P., … Patel, M. D. D. (2022, November 18). JOURNAL OF CONTINGENCIES AND CRISIS MANAGEMENT, Vol. 11.

author keywords: COVID-19; decision science; systems science; organizational behaviour
UN Sustainable Development Goal Categories
4. Quality Education (Web of Science)
Sources: Web Of Science, ORCID
Added: December 12, 2022

2022 journal article

The SMART Framework: Selection of Machine Learning Algorithms With ReplicaTions-A Case Study on the Microvascular Complications of Diabetes

IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS, 26(2), 809–817.

By: B. Swan n, M. Mayorga n & J. Ivy n

author keywords: Data-driven modeling; decision theory; diabetes; machine learning
MeSH headings : Algorithms; Diabetes Complications; Diabetes Mellitus / diagnosis; Humans; Machine Learning
TL;DR: The Selection of Machine-learning Algorithms with ReplicaTions (SMART) Framework is a powerful, interactive tool that incorporates various ML algorithms and stakeholder preferences, generalizable to new data and technological advancements. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID
Added: April 4, 2022

2021 journal article

Association of Simulated COVID-19 Vaccination and Nonpharmaceutical Interventions With Infections, Hospitalizations, and Mortality

JAMA NETWORK OPEN, 4(6).

By: M. Patel*, E. Rosenstrom n, J. Ivy n, M. Mayorga n, P. Keskinocak*, R. Boyce*, K. Hassmiller Lich*, R. Smith* ...

MeSH headings : Adult; COVID-19 / epidemiology; COVID-19 / prevention & control; COVID-19 / transmission; COVID-19 Vaccines / pharmacology; Communicable Disease Control / methods; Communicable Disease Control / organization & administration; Communicable Disease Control / statistics & numerical data; Computer Simulation; Disease Transmission, Infectious / prevention & control; Female; Hospitalization / statistics & numerical data; Humans; Male; Mass Vaccination / organization & administration; Mass Vaccination / statistics & numerical data; Mortality; North Carolina / epidemiology; Risk Assessment / methods; Risk Assessment / statistics & numerical data; SARS-CoV-2; Treatment Outcome; Vaccination Coverage / organization & administration; Vaccination Coverage / statistics & numerical data
TL;DR: Findings highlight the need for high COVID-19 vaccine coverage and continued adherence to NPIs before safely resuming many prepandemic activities. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: June 10, 2021

2021 article

Data to Donations: Towards In-Kind Food Donation Prediction across Two Coasts

2021 IEEE GLOBAL HUMANITARIAN TECHNOLOGY CONFERENCE (GHTC), pp. 281–288.

By: E. Sharma n, L. Davis*, J. Ivy n & M. Chi n

author keywords: Food Insecurity; Humanitarian Supply Chain; Bayesian Structural Time Series; Long Short Term Memory; Training Length; Expanding and Sliding Window
TL;DR: This work investigates the effectiveness of employing an average of all predictions formed by considering all three factors at both monthly and weekly levels for both food banks and shows that this average of predictions significantly and consistently outperforms all classical models, deep learning, and BSTS. (via Semantic Scholar)
UN Sustainable Development Goal Categories
14. Life Below Water (OpenAlex)
Source: Web Of Science
Added: March 28, 2022

2021 article

Elicitation of Preference among Multiple Criteria in Food Distribution by Food Banks

Hasnain, T., Sengul Orgut, I., & Ivy, J. S. (2021, October 22). PRODUCTION AND OPERATIONS MANAGEMENT.

By: T. Hasnain n, I. Sengul Orgut* & J. Ivy n

author keywords: food bank; equity; multi-criteria optimization; preference elicitation; humanitarian operations; UN Sustainable Development Goals
Source: Web Of Science
Added: November 8, 2021

2021 article

Modeling the role of efficiency for the equitable and effective distribution of donated food

Islam, M. H., & Ivy, J. S. (2021, June 16). OR SPECTRUM.

By: M. Islam n & J. Ivy n

author keywords: Food bank; Food insecurity; Donation distribution; Equity; Efficiency; Effectiveness
Source: Web Of Science
Added: June 28, 2021

2021 journal article

Proximity of Cellular and Physiological Response Failures in Sepsis

IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS, 25(11), 4089–4097.

By: A. Jazayeri*, M. Capan*, J. Ivy n, R. Arnold* & C. Yang*

author keywords: Physiology; Blood pressure; Biological systems; Statistics; Sociology; Predictive models; Hospitals; Sepsis prediction; proximate failures; sepsis feature selection
MeSH headings : Hospitalization; Humans; Machine Learning; Prognosis; Sepsis / diagnosis
TL;DR: This study identifies the dependency patterns of significant proximate sepsis-related failures of cellular and physiological responses using data from 12,223 adult patients hospitalized between July 2013 and December 2015 and reveals the few significant proxies that play the major roles in predicting patients’ outcomes. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Source: Web Of Science
Added: November 23, 2021

2020 article

EVALUATING DIABETIC RETINOPATHY SCREENING INTERVENTIONS IN A MICROSIMULATION MODEL

2020 WINTER SIMULATION CONFERENCE (WSC), pp. 944–955.

By: B. Swan n, S. Nambiar n, P. Koutouan n, M. Mayorga n, J. Ivy n & S. Fransen

TL;DR: A microsimulation integrating the natural history model of DR with a patient’s interaction with the care system increased adherence of patients with vision-threatening DR to follow-up eye care, decreased the number of ‘unnecessary’ visits in specialty eye care from patients without VTDR, and decreased the total years spent blind. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID
Added: August 30, 2021

2019 journal article

Simulation model of the relationship between cesarean section rates and labor duration

Health Care Management Science, 22(4), 635–657.

author keywords: Medical decision making; Mode of delivery; Birth; Simulation; Dystocia; Percentile matching
MeSH headings : Cesarean Section / statistics & numerical data; Clinical Decision Rules; Computer Simulation; Decision Trees; Female; Humans; Labor, Obstetric; Pregnancy; Stochastic Processes; Time Factors; United States
TL;DR: Two stochastic simulation models of the delivery process for women in labor are developed and it is concluded that for singleton births by nulliparous women with no prior complications, labor duration longer than two hours should be allowed in each dilation state. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Sources: Web Of Science, Crossref, ORCID
Added: November 25, 2019

2019 journal article

The value of missing information in severity of illness score development

JOURNAL OF BIOMEDICAL INFORMATICS, 97.

By: J. Agor*, O. Ozaltin*, J. Ivy*, M. Capan*, R. Arnold & S. Romero

Contributors: J. Agor*, O. Özaltın*, J. Ivy*, M. Capan*, R. Arnold & S. Romero

author keywords: Severity of illness scores; Sepsis; Missing data; Prediction models; Electronic health records
MeSH headings : Adolescent; Adult; Aged; Aged, 80 and over; Area Under Curve; Computational Biology / methods; Data Interpretation, Statistical; Electronic Health Records / statistics & numerical data; Female; Hospital Mortality; Humans; Intensive Care Units; Logistic Models; Male; Middle Aged; Models, Statistical; Outcome Assessment, Health Care / statistics & numerical data; Sepsis / mortality; Severity of Illness Index; Support Vector Machine; Young Adult
TL;DR: When developing prediction models using longitudinal EHR data, researchers should explore the incorporation of indicators for missing variables along with appropriate imputation to improve the performance of severity of illness scoring systems. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID
Added: April 27, 2020

2018 journal article

Diabetes and the hospitalized patient: A cluster analytic framework for characterizing the role of sex, race and comorbidity from 2006 to 2011

HEALTH CARE MANAGEMENT SCIENCE, 21(4), 534–553.

By: N. Nataraj n, J. Ivy n, F. Payton n & J. Norman*

author keywords: Diabetes; Comorbidities; Patient outcomes; Cluster analysis; Generalized linear models
MeSH headings : Adult; Aged; Aged, 80 and over; Cluster Analysis; Comorbidity; Diabetes Mellitus / epidemiology; Diabetes Mellitus / ethnology; Female; Hospital Charges / statistics & numerical data; Hospitalization / economics; Hospitalization / statistics & numerical data; Humans; Length of Stay; Logistic Models; Male; Middle Aged; Outcome Assessment, Health Care; Patient Discharge / statistics & numerical data; Racial Groups / statistics & numerical data; Sex Factors; United States
TL;DR: Results showed that, although hospitalized women had better outcomes than men, the impact of diabetes was worse for women, and non-White patients had longer lengths of stay and higher total charges. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID
Added: November 5, 2018

2018 journal article

Exploring the Value of Waiting During Labor

SERVICE SCIENCE, 10(3), 334–353.

By: K. Hicklin*, J. Ivy n, F. Payton n, M. Viswanathan* & E. Myers*

author keywords: Bayesian decision analysis; value of information; mode of delivery; health services and networks; medical decision making
TL;DR: This study determines the conditional value of information gathered during an observation period before deciding to end labor and perform a C-section based on the decision maker’s belief about successful labor. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Sources: Web Of Science, ORCID
Added: October 16, 2018

2018 journal article

Not all organ dysfunctions are created equal - Prevalence and mortality in sepsis

JOURNAL OF CRITICAL CARE, 48, 257–262.

By: M. Capan*, S. Hoover*, J. Ivy n, K. Miller* & R. Arnold*

author keywords: Sepsis; Organ dysfunction; Electronic Health Records; Healthcare systems
MeSH headings : Adult; Aged; Delaware / epidemiology; Female; Hospital Mortality; Humans; Logistic Models; Male; Middle Aged; Multiple Organ Failure / epidemiology; Multiple Organ Failure / mortality; Odds Ratio; Prevalence; Retrospective Studies; Risk Factors; Sepsis / epidemiology; Sepsis / mortality
TL;DR: There exist differences in measures of organ dysfunction occurrence and their association with mortality, and these findings support increased clinical efforts to identify sepsis patients to inform diagnostic decisions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Source: Web Of Science
Added: November 26, 2018

2018 journal article

Robust optimization approaches for the equitable and effective distribution of donated food

EUROPEAN JOURNAL OF OPERATIONAL RESEARCH, 269(2), 516–531.

By: I. Orgut n, J. Ivy n, R. Uzsoy n & C. Hale

author keywords: Humanitarian operations; Robust optimization; Uncertainty modeling; Food bank; Distribution
TL;DR: Two robust optimization models to support the equitable and effective distribution of donated food over the food bank's service area are presented and structural properties of both models are derived and efficient exact solution algorithms are developed. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2017 journal article

A simulation approach for evaluating medication supply chain structures

International Journal of Systems Science: Operations & Logistics, 4(1), 13–26.

By: K. Smith n, A. Vila-Parrish n, J. Ivy n & S. Abel*

TL;DR: Two simulation models which represent commonly used supply chains: centralised and stockless are developed and a case study using meropenem, an antibiotic, is presented to explore the impact of product and demand characteristics on the cost effectiveness of each approach. (via Semantic Scholar)
Source: Crossref
Added: November 29, 2020

2017 journal article

A stochastic model of acute-care decisions based on patient and provider heterogeneity

HEALTH CARE MANAGEMENT SCIENCE, 20(2), 187–206.

author keywords: Acute physiological deterioration; Earlywarning scores; Semi-Markov decision process model; Cluster analysis
MeSH headings : Clinical Decision-Making; Critical Care; Delivery of Health Care; Heart Arrest / therapy; Humans; Stochastic Processes
TL;DR: A semi-Markov decision process model of APD that incorporates patient and provider heterogeneity is documents, which allows for stochastically changing health states, while determining patient subpopulation-specific RRT-activation thresholds. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2017 conference paper

LSTM for septic shock: Adding unreliable labels to reliable predictions

2017 IEEE International Conference on Big Data (Big Data), 1233–1242.

TL;DR: A generic framework to predict septic shock based on Long-Short Term Memory (LSTM) model, which is capable of memorizing temporal dependencies over a long period, is proposed and the robustness of the method is validated using three sets of clinician-proposed adjusted ground-truth labels. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

2017 journal article

Modeling for the equitable and effective distribution of food donations under stochastic receiving capacities

IISE TRANSACTIONS, 49(6), 567–578.

By: I. Orgut n, J. Ivy n & R. Uzsoy n

author keywords: Food distribution; stochastic models; equity; fairness; effectiveness; food bank; capacitated network flow problems; newsvendor problem; humanitarian logistics; food insecurity
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2016 conference paper

A Framework for modeling the complex interaction between breast cancer and diabetes

2016 10th european conference on antennas and propagation (eucap), 1245–1256.

By: S. Goodarzi n, K. McKenzie n, N. Nataraj n, J. Ivy n, M. Mayorga n, J. Mason*, J. Tejada

TL;DR: A simulation model framework is built that explores the interaction between breast cancer and diabetes and assesses the prognosis for women diagnosed with diabetes considering their breast cancer risk, using data from national survey and surveillance consortium studies. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2016 journal article

Achieving equity, effectiveness, and efficiency in food bank operations: Strategies for feeding America with implications for global hunger relief

Advances in Managing Humanitarian Operations, 235, 229–256.

By: I. Orgut, L. Brock, L. Davis, J. Ivy, S. Jiang, S. Morgan, R. Uzsoy, C. Hale, E. Middleton

Source: NC State University Libraries
Added: August 6, 2018

2016 conference paper

Assessing the reliability of the radiation therapy care delivery process using discrete event simulation

2016 10th european conference on antennas and propagation (eucap), 1233–1244.

By: P. Pooya, J. Ivy, P. Mosaly, G. Tracton, N. Singh, G. Tracton, N. Singh

Source: NC State University Libraries
Added: August 6, 2018

2016 journal article

Modeling for the equitable and effective distribution of donated food under capacity constraints

IIE TRANSACTIONS, 48(3), 252–266.

By: I. Orgut n, J. Ivy n, R. Uzsoy n & J. Wilson n

author keywords: Food distribution; equity; fairness; effectiveness; food bank; capacitated network flow problems; resource allocation; humanitarian logistics; food supply chain; food insecurity
Sources: Web Of Science, ORCID
Added: August 6, 2018

2016 journal article

Modeling the effect of public health resources and alerting on the dynamics of pertussis spread

HEALTH SYSTEMS, 5(2), 81–97.

By: E. Yaylali n, J. Ivy n, R. Uzsoy n, E. Samoff*, A. Meyer* & J. Maillard*

author keywords: discrete event simulation; contact tracing; pertussis; infectious disease modeling; outbreak management
TL;DR: The results suggest that the time to initiate contact tracing significantly affects the magnitude and duration of the outbreak, and some outbreaks could not be controlled within the 1-year time limit of simulation. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID
Added: August 6, 2018

2016 conference paper

Simulation of labor: a study of the relationship between cesarean section rates and the time spent in labor

2016 10th european conference on antennas and propagation (eucap), 1269–1280.

By: K. Hicklin n, J. Ivy n, E. Myers*, V. Kulkarni* & M. Viswanathan*

TL;DR: In this simulation, the Friedman Curve and other labor progression rules are evaluated to identify circumstances in which the cesarean rate can be decreased through the analysis of the total length of time a woman spends in labor as well as the duration oftime a woman remains in a cervical dilation stage. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

2015 journal article

Combined DES/SD model of breast cancer screening for older women, I: Natural-history simulation

IIE TRANSACTIONS, 47(6), 600–619.

By: J. Tejada, J. Ivy n, J. Wilson n, M. Ballan n, K. Diehl* & B. Yankaskas*

author keywords: breast cancer; combined discrete-continuous simulation; medical decision making; chronic disease; screening older U.S. women; system dynamics; discrete-event simulation; Health care
TL;DR: A two-phase simulation approach to defining and modeling the main components in the breast cancer screening-and-treatment process for older women is introduced and a natural-history model of the incidence and progression of untreated breast cancer is discussed. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2015 journal article

Impact of the influenza season on a hospital from a pharmaceutical inventory management perspective

Health Systems, 4(1), 12–28.

By: A. Vila-Parrish n, J. Ivy n & B. He n

author keywords: simulation; perishable inventory; infectious disease; hospital pharmacy inventory management; influenza
TL;DR: This paper develops two simulation models: a disease outbreak model and a medication inventory model, which incorporates the impact of disease spread, patients’ health conditions, and medication shelf life and performs sensitivity analysis on several parameters. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: Crossref
Added: February 24, 2020

2015 journal article

Individualizing and optimizing the use of early warning scores in acute medical care for deteriorating hospitalized patients

RESUSCITATION, 93, 107–112.

By: M. Capan n, J. Ivy n, T. Rohleder*, J. Hickman* & J. Huddleston*

author keywords: Markovian; Deterioration; Prediction
MeSH headings : Cohort Studies; Delivery of Health Care / methods; Delivery of Health Care / standards; Early Diagnosis; Early Medical Intervention / methods; Early Medical Intervention / standards; Electronic Health Records; Female; Healthcare Failure Mode and Effect Analysis / methods; Healthcare Failure Mode and Effect Analysis / standards; Heart Arrest / diagnosis; Heart Arrest / prevention & control; Hospitalization / statistics & numerical data; Humans; Male; Middle Aged; Monitoring, Physiologic / methods; Outcome and Process Assessment, Health Care; Patient Acuity; Prognosis; Propensity Score; United States
TL;DR: EWS were used to identify personalized thresholds for RRT activation for statistically significant Markovian patient subpopulations as a function of frailty and admission type, and the full potential of EWS for personalizing acute care delivery is yet to be realized. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2015 journal article

The association between event learning and continuous quality improvement programs and culture of patient safety

Practical Radiation Oncology, 5(5), 286–294.

By: L. Mazur*, B. Chera*, P. Mosaly*, K. Taylor*, G. Tracton*, K. Johnson*, E. Comitz*, R. Adams* ...

MeSH headings : Humans; Patient Safety / standards; Quality Assurance, Health Care / standards; Quality Improvement / standards; Safety Management / standards
TL;DR: Results suggest that event learning and continuous quality improvement programs can be successfully implemented and that there are contemporaneous improvements in the culture of safety. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Crossref
Added: February 24, 2020

2015 journal article

Understanding the evolution of mathematics performance in primary education and the implications for STEM learning: A Markovian approach

COMPUTERS IN HUMAN BEHAVIOR, 47, 4–17.

By: A. Reamer n, J. Ivy n, A. Vila-Parrish n & R. Young n

author keywords: Mathematics education; Longitudinal student data; Markov chain; Educational data mining
TL;DR: This work conducts an extensive examination of tens of thousands of student records and uses Markov chain models to probabilistically characterize the movement of students' scores from one grade level to the next, the first step in developing a framework to forecast individual students' development of mathematical knowledge over time. (via Semantic Scholar)
UN Sustainable Development Goal Categories
4. Quality Education (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2015 journal article

Using systems modeling to enhance public health preparedness

Health Systems, 4(1), 1–4.

By: J. Ivy n, J. Horney & J. Maillard*

author keywords: public health preparedness; systems modeling; global public health; global outbreak response
TL;DR: A goal of this special issue is to serve as a medium for communicating systems methods to public health practice and to increase practitioners’ awareness of the role that systems methods can play in addressing complex planning and implementation issues associated with public health preparedness. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Crossref
Added: February 24, 2020

2014 journal article

Combined DES/SD model of breast cancer screening for older women, II: screening-and-treatment simulation

IIE Transactions, 46(7), 707–727.

By: J. Tejada, J. Ivy n, R. King n, J. Wilson n, M. Ballan n, M. Kay n, K. Diehl*, B. Yankaskas*

Contributors: J. Tejada, J. Ivy n, R. King n, J. Wilson n, M. Ballan n, M. Kay n, K. Diehl*, B. Yankaskas*

author keywords: discrete-event simulation; breast cancer; medical decision making; screening older U.S. women; Health care; system dynamics; combined discrete-continuous simulation
TL;DR: How both the natural-history and screening-and-treatment simulations can be used for performance comparisons of proposed screening policies based on overall cost-effectiveness, the numbers of life- years and quality-adjusted life-years saved, and the main components of the total cost incurred by each policy are presented. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Sources: Web Of Science, ORCID, Crossref
Added: August 6, 2018

2014 journal article

Competing risks analysis in mortality estimation for breast cancer patients from independent risk groups

HEALTH CARE MANAGEMENT SCIENCE, 17(3), 259–269.

By: S. Zhang*, J. Ivy n, J. Wilson n, K. Diehl* & B. Yankaskas*

author keywords: Breast cancer; Mortality estimation; Competing risks; Cumulative incidence; Risk factors; Log(-log) transformation
MeSH headings : Black or African American; Age Factors; Animals; Biomarkers; Breast Neoplasms / ethnology; Breast Neoplasms / mortality; Female; Humans; Incidence; Middle Aged; Regression Analysis; Risk Assessment; Risk Factors; Time Factors; White People
TL;DR: A competing risks framework is built to analyze the effect of patient risk factors and cancer characteristics on breast cancer and other cause mortality and a nonparametric cumulative incidence function is formulated using data from the community-based Carolina Mammography Registry. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2014 journal article

Optimal two-phase vaccine allocation to geographically different regions under uncertainty

EUROPEAN JOURNAL OF OPERATIONAL RESEARCH, 233(1), 208–219.

By: H. Yarmand n, J. Ivy n, B. Denton* & A. Lloyd n

author keywords: OR in health services; Epidemic control; Two-phase vaccine allocation; Stochastic linear program; Newsvendor model; Value of stochastic solution
TL;DR: A decision process in which vaccination is performed in two phases to contain the outbreak of an infectious disease in a set of geographic regions potentially results in a lower attack rate and a considerable saving in vaccine production and administration cost. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2014 journal article

Scheduling food bank collections and deliveries to ensure food safety and improve access

Socio-Economic Planning Sciences, 48(3), 175–188.

By: L. Davis*, I. Sengul n, J. Ivy n, L. Brock* & L. Miles n

author keywords: Food distribution; Hunger relief; Humanitarian logistics; Set covering; Vehicle routing
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Source: Crossref
Added: August 28, 2020

2014 journal article

Systems Engineering Methods for Enhancing the Value Stream in Public Health Preparedness: The Role of Markov Models, Simulation, and Optimization

PUBLIC HEALTH REPORTS, 129, 145–153.

By: E. Yaylali n, J. Ivy n & J. Taheri n

MeSH headings : Computer Simulation; Disaster Planning / organization & administration; Disaster Planning / standards; Disease Outbreaks / prevention & control; Humans; Influenza, Human / prevention & control; Markov Chains; Models, Organizational; Operations Research; Public Health Practice; Quality Improvement
TL;DR: Three models developed through a four-year partnership with stakeholders from state and local public health for effectively, efficiently, and appropriately responding to potential public health threats are presented. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2013 journal article

Analytic solution of the susceptible-infective epidemic model with state-dependent contact rates and different intervention policies

SIMULATION-TRANSACTIONS OF THE SOCIETY FOR MODELING AND SIMULATION INTERNATIONAL, 89(6), 703–721.

By: H. Yarmand n & J. Ivy n

author keywords: susceptible-infective model; epidemic duration; state-dependent contact rates; interventions
TL;DR: The susceptible-infective (SI) epidemiological model is considered, a variant of the Kermack–McKendrick models, and the contact rate is let be a function of the number of infectives, an indicator of disease spread during the course of the epidemic. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2013 journal article

Characterizing the impact of mental disorders on HIV patient length of stay and total charges

IIE Transactions on Healthcare Systems Engineering, 3(3), 139–146.

By: S. Zhang*, F. Payton n & J. Ivy n

TL;DR: The impact of comorbidities, with a particular focus on mental disorders, on HIV patient outcomes as measured by patient length of stay (LOS) and total charges in the adult 2006 National Inpatient Sample is studied. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Crossref, ORCID
Added: August 28, 2020

2013 journal article

Identifying optimal mitigation strategies for responding to a mild influenza epidemic

SIMULATION-TRANSACTIONS OF THE SOCIETY FOR MODELING AND SIMULATION INTERNATIONAL, 89(11), 1400–1415.

By: H. Yarmand n, J. Ivy n & S. Roberts n

author keywords: Simulation; mild epidemic; optimal control policy; cost-effectiveness analysis; vaccination; self-isolation
TL;DR: A continuous-time simulation model for the spread of a mild influenza epidemic based on the SEIR model, which shows that for low (high) levels of intervention, vaccination is incrementally more cost-effective than self-isolation, and public health officials should concentrate on vaccination at the beginning of the epidemic. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2013 journal article

Optimal intervention strategies for an epidemic: A household view

SIMULATION-TRANSACTIONS OF THE SOCIETY FOR MODELING AND SIMULATION INTERNATIONAL, 89(12), 1505–1522.

By: H. Yarmand n & J. Ivy n

TL;DR: This research considers an affected household and model the effect of different intervention policies, which involve vaccination, antiviral prophylaxis, isolation, and treatment, on disease spread using a variation of Kermack–McKendrick (KM) models. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2013 journal article

The association of breast density with breast cancer mortality in African American and white women screened in community practice

BREAST CANCER RESEARCH AND TREATMENT, 137(1), 273–283.

By: S. Zhang*, J. Ivy n, K. Diehl* & B. Yankaskas*

author keywords: Breast cancer; Mortality; Breast density; Mammography screening
MeSH headings : Adult; Black or African American; Age Factors; Aged; Aged, 80 and over; Breast / pathology; Breast Neoplasms / diagnostic imaging; Breast Neoplasms / ethnology; Breast Neoplasms / mortality; Community Health Services; Early Detection of Cancer; Female; Humans; Mammography; Middle Aged; North Carolina / epidemiology; Prevalence; Proportional Hazards Models; Registries; White People
TL;DR: The cumulative mortality probability estimates showed that women with dense breast tissues did not have significantly different breast cancer mortality than women with fatty breast tissue, regardless of age, and Aging, African American race, and advanced cancer stage were found to be significant risk factors for Breast cancer mortality. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2012 journal article

A Conceptual Framework for Future Research on Mode of Delivery

MATERNAL AND CHILD HEALTH JOURNAL, 16(7), 1447–1454.

By: J. Wu*, M. Viswanathan* & J. Ivy n

author keywords: Cesarean delivery on maternal request; Conceptual framework; Mode of delivery; Research priorities
MeSH headings : Delivery, Obstetric / methods; Delivery, Obstetric / standards; Delphi Technique; Female; Humans; Models, Theoretical; North Carolina; Pregnancy; Research / trends
TL;DR: The conceptual framework illustrates the causal pathway for mode of delivery and the complex interplay and relationships among patient, fetal, family, provider, cultural, and societal factors as drivers of change from intended to actual mode of Delivery. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2012 journal article

Patient-based pharmaceutical inventory management: a two-stage inventory and production model for perishable products with Markovian demand

Health Systems, 1(1), 69–83.

By: A. Vila-Parrish n, J. Ivy n, R. King n & S. Abel*

author keywords: Markov decision process; perishable inventory; pharmacy; medication inventory management
TL;DR: This work uses a stochastic ‘demand state’ as a surrogate for patient condition and develops a Markov decision process to determine optimal, state-dependent two-stage inventory and production policies and applies this framework to the management of Meropenem. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Crossref, ORCID
Added: February 24, 2020

2012 journal article

Simulating Public Health Capacity to Measure Performance:E. coliO157 at the North Carolina State Fair

Risk, Hazards & Crisis in Public Policy, 3(3), 69–82.

By: S. Winter, J. Ivy* & J. Horney

author keywords: public health; performance measures; E. coli O157
TL;DR: It is found that although the capacity exists within NC PHIN to increase emergency preparedness and response, some factors limitNC PHIN's effectiveness and it is suggested that proper resource allocation will be necessary in order to realize the potential of NC PHin. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Crossref
Added: January 5, 2021

2010 article

COST-EFFECTIVENESS ANALYSIS OF VACCINATION AND SELF-ISOLATION IN CASE OF H1N1

PROCEEDINGS OF THE 2010 WINTER SIMULATION CONFERENCE, pp. 2199–2210.

By: H. Yarmand*, J. Ivy*, S. Roberts*, M. Bengtson & N. Bengtson

TL;DR: A continuous-time simulation model for the spread of H1N1 which allows for three types of interventions: antiviral prophylaxis and treatment, vaccination, and self-isolation and mandatory quarantine is developed. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2010 journal article

Modeling the impact of comorbidity on breast cancer patient outcomes

HEALTH CARE MANAGEMENT SCIENCE, 13(2), 137–154.

By: S. Zhang n, J. Ivy n, F. Payton n & K. Diehl*

author keywords: Nationwide inpatient sample; Breast cancer; Comorbidity; Descriptive statistics; Least squares regression; Survival analysis; Logistic regression; Censoring; Length of stay; Total charges; Mortality
MeSH headings : Aged; Breast Neoplasms / economics; Breast Neoplasms / mortality; Breast Neoplasms, Male / economics; Breast Neoplasms, Male / mortality; Comorbidity; Female; Hospital Charges / statistics & numerical data; Humans; Length of Stay; Logistic Models; Male; Middle Aged; Models, Theoretical; Outcome Assessment, Health Care; Survival Analysis; United States / epidemiology
TL;DR: This study shows that certain hypertension may not increase length of stay and total charges; diabetes behaves differently among general population and breast cancer patients; mental disorder has an impact on patient disposition that affects true length ofStay and charges, and obesity may have limited effect on patient outcomes. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID
Added: August 6, 2018

2010 review

Pelvic Floor Consequences of Cesarean Delivery on Maternal Request in Women with a Single Birth: A Cost-effectiveness Analysis

[Review of ]. JOURNAL OF WOMENS HEALTH, 19(1), 147–160.

By: X. Xu*, J. Ivy n, D. Patel*, S. Patel*, D. Smith*, S. Ransom*, D. Fenner*, J. DeLancey*

MeSH headings : Algorithms; Cesarean Section / adverse effects; Cesarean Section / economics; Cesarean Section / psychology; Cost-Benefit Analysis; Decision Support Techniques; Delivery, Obstetric / economics; Delivery, Obstetric / methods; Elective Surgical Procedures / economics; Fecal Incontinence / etiology; Female; Gravidity; Humans; Monte Carlo Method; Pelvic Floor; Pelvic Organ Prolapse / etiology; Pregnancy; Pregnancy Outcome; Quality of Life; Quality-Adjusted Life Years; Trial of Labor; Urinary Incontinence / etiology
TL;DR: The objective was to assess the cost-effectiveness of CDMR in comparison to trial of labor (TOL) for primigravid women without medical/obstetric indications with a single childbirth over their lifetime, while explicitly accounting for the management of PFD throughout the lifetime. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2010 journal article

Univariate input models for stochastic simulation

Journal of Simulation, 4(2), 81–97.

By: M. Kuhl*, J. Ivy n, E. Lada*, N. Steiger*, M. Wagner & J. Wilson n

author keywords: simulation; continuous univariate input models; generalized beta distributions; Johnson translation system of distributions; Bezier distributions
Source: Crossref
Added: August 28, 2020

2009 journal article

Quantifying the Impact of Variability and Noise on Patient Outcomes in Breast Cancer Decision Making

Quality Engineering, 21(3), 319–334.

By: J. Simmons Ivy, H. Black Nembhard* & K. Baran*

TL;DR: A simulation-based model that combines statistical process control with a partially observable Markov decision process to incorporate uncertainty, the inherent variability between radiologists, and system noise finds that variability among different radiologists in the ability to correctly interpret a mammogram has the most significant impact on whether a woman will receive incorrect results. (via Semantic Scholar)
UN Sustainable Development Goal Categories
5. Gender Equality (Web of Science)
Source: Crossref
Added: January 5, 2021

2008 article

A SIMULATION-BASED APPROACH FOR INVENTORY MODELING OF PERISHABLE PHARMACEUTICALS

2008 WINTER SIMULATION CONFERENCE, VOLS 1-5, pp. 1532–1538.

By: A. Vila-Parrish n, J. Ivy n & R. King n

TL;DR: A policy is developed which is based on the idea that hospitals can improve both costs and patient demand fulfillment by using knowledge of patient mix to guide their drug inventory and preparation decisions and is compared to a simpler stationary base stock policy. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2008 journal article

Assessing Dynamic Breast Cancer Screening Policies

OPERATIONS RESEARCH, 56(6), 1411–1427.

By: L. Maillart*, J. Ivy n, S. Ransom* & K. Diehl*

TL;DR: It is concluded that, in general, to efficiently achieve a lifetime risk comparable to the current risk among U.S. women, screening should start relatively early in life and continue relatively late in life regardless of the screening interval(s) adopted. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
5. Gender Equality (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2007 journal article

Integrated reconfiguration and age-based preventive maintenance decision making

IIE Transactions, 39(12), 1085–1102.

author keywords: age-based preventive maintenance; reconfigurable manufacturing systems; integrated production; maintenance decision making
Source: Crossref
Added: August 28, 2020

2006 journal article

Childbirth and pelvic floor dysfunction: An epidemiologic approach to the assessment of prevention opportunities at delivery

American Journal of Obstetrics and Gynecology, 195(1), 23–28.

By: D. Patel, X. Xu, A. Thomason*, S. Ransom, J. Ivy* & J. DeLancey*

author keywords: childbirth; epidemiology; pelvic floor dysfunction; prevention
MeSH headings : Cesarean Section; Delivery, Obstetric / adverse effects; Episiotomy; Fecal Incontinence / epidemiology; Female; Humans; Pelvic Floor / physiopathology; Pregnancy; Risk Factors; Urinary Tract Infections / epidemiology; Uterine Prolapse / prevention & control; Vagina / injuries
TL;DR: This discussion considers the conceptual principles of epidemiologic function and the availability of data that are necessary to make informed recommendations about prevention opportunities for pelvic floor dysfunction at delivery to suggest there may be substantial opportunities for the primary prevention of pelvic organ prolapse at delivery. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: Crossref
Added: August 28, 2020

2005 journal article

A Modeling Approach to Maintenance Decisions Using Statistical Quality Control and Optimization

Quality and Reliability Engineering International, 21(4), 355–366.

By: J. Ivy* & H. Nembhard*

author keywords: maintenance; decision making; partially observable Markov decision processes (POMDPs); statistical quality control (SQC); simulation
Source: Crossref
Added: August 28, 2020

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