Eduardo Perez

Texas State University | TxSt · Ingram School of Engineering

The increased demand for medical diagnosis procedures has been recognized as one of the contributors to the rise of health care costs in the U.S. in the last few years. Nuclear medicine is a subspecialty of radiology that uses advanced technology and radiopharmaceuticals for the diagnosis and treatment of medical conditions. Procedures in nuclear m...

Increased demand for specialized healthcare services has been identified as one of the causes of increased healthcare costs in the US. Nuclear medicine, a sub-specialty of radiology, uses relatively new technology to diagnose and treat patients. Procedures (tests) in nuclear medicine require the use of radiopharmaceuticals with a limited half-life...

Wind farms provide a source of clean and renewable energy. However, unlike many industries where machines are operated under more or less static conditions, wind turbines suffer from stochastic loading due to the hourly or seasonal variation of wind speed and direction. The stochastic loading of wind turbines makes their degradation or failure pred...

Dynamic data-driven applications systems (DDDAS)–based methods entail models which at execution time that can dynamically incorporate measurement data and in reverse, the model controls the instrumentation to target measurements or apply coordinated actuation, and do so by combining the use of computer models, mathematical algorithms, and measureme...

The goal of this research is to improve access to services for patients in need of augmentative and alternative communication (AAC). The specific aim of this paper is to develop a decision-making model that evaluates an exhaustive list of AAC devices and recommends the best alternative(s) for the patient. The model maximises a best-fit function tha...

Food banks are non-profit, charitable organizations that distribute food and products to people in need. Food bank facilities become disaster relief centers after natural disasters. The uncertainty associated with the arrival of donations and demand make the planning and operations of food banks challenging during the disaster relief period. The go...

Long waiting times are a major reason for patient dissatisfaction in outpatient clinics. Existing research in patient scheduling has established the relationship between the number of providers and patient waiting times. However, no research has explored the problem by considering patient flow through multiple stages with multiple servers. In this...

Trauma care services are a vital part of all healthcare-based networks as timely accessibility is important for citizens. Trauma care access is even more relevant when unexpected events such as the COVID-19 pandemic overload the capacity of hospitals. Research literature has highlighted that access to trauma care is not equal for all populations, e...

ID: 963205 Abstract Food banks are non-profit organizations that gather and distribute supplies to agencies serving people in need. Foodbanks obtain donations (i.e supplies) from the public, and from public and private organizations. The demand of supplies needed to collaborating agencies is very dynamic and difficult to predict. This is especially...

Wind turbines experience stochastic loading due to seasonal variations in wind speed and direction. These harsh operational conditions lead to failures of wind turbines, which are difficult to predict. Consequently, it is challenging to schedule maintenance actions that will avoid failures. In this article, a simulation-driven online maintenance sc...

Disaster response involves the planning, coordination, and distribution of supplies in an effective manner to people in need. Recent natural hazards, such as hurricane Harvey, have exposed the complexities and challenges associated with those tasks. In this paper, a stochastic programming model is presented which considers prepositioning strategies...

The objective of this study was to analyze the effect of the quantity and quality of the feed offered on the performance of male beef cattle, >6 months old, on intensive grazing systems in Uruguay. Two hundred and fifty-four results from different experimental trials (nexp=68) performed between 1991 and 2020 by different research institutions in Ur...

Hospitals and clinics are increasingly interested in building partnerships with community-based organizations to address the social determinants of health. Choosing among community-based health programs can be complex given that programs may have different effectiveness levels and implementation costs. This study develops a decision-making model th...

Research has found that hospitals with better scores on patient experience of care surveys have better patient safety records and outcomes. Therefore, targeting ways of improving patient experience of care is becoming relevant for hospitals not only for the patient health outcomes but also for the financial implications. Therefore, the goal of this...

This paper presents a simulation-based planning methodology that aims to improve patient service quality in pure walk-in clinics. Capacity planning is one of the major challenges in walk-in clinics because of the uncertainty in both patient demand and arrival times. This work presents a discrete-event simulation model for walk-in clinics that takes...

Patient healthcare personalization provides new opportunities for health care systems in their pursuit of better patient outcomes and commitment to quality and safety. Much like the recent expansion of product customization, healthcare personalization has been expanding lately due to a variety of factors including technological advances that connec...

This paper derives a healthcare mobile facility concept for patients needing Augmentative and Alternative Communication (AAC) using the systems engineering method. The vehicle should facilitate the health care service delivery for patient condition assessment and AAC device evaluation. The evaluation of the individual’s ability for the use of AAC r...

The goal of this research is to improve the access to services for patients in need of Augmentative and Alternative Communication (AAC). The research aim of this paper is to develop optimization models that can help in recommending the best group of devices to consider for a patient needing AAC based on a disability profile. Currently, there are mu...

This paper considers a parallel-machine scheduling problem with sequence dependent processing times and periodic maintenance. The time to complete jobs increases as the machines deteriorate and the machine deterioration depends on the particular job sequence assigned to a machine. The planned maintenance activity returns the machine to its optimal...

Oncology clinics are often burdened with scheduling large volumes of cancer patients for chemotherapy under limited resources, such as nurses and chemotherapy chairs. Chemotherapy is a cancer treatment method that is administered orally or intravenously at an outpatient oncology clinic. Chemotherapy patients require a treatment regimen, which is a...

In the United States about 100,000 people die annually from healthcare-associated infections (HAIs). Catheter-associated urinary tract infections (CAUTI) are the second most common type of HAI in the US, accounting for about 15% of HAIs. CAUTIs pose a significant treat to patients, which consequences could be as minor as an extra day in the hospita...

Current methods for addressing catheter-associated urinary tract infections (CAUTIs) are mostly focused on the biological causes, emphasizing the adherence to prevention guidelines, collecting data and disseminating the results, as well as identifying emerging threats from infectious organisms. However, there is a need for tools that can help organ...

Two important managerial objectives incorporated in production planning are the maximisation of the on-time delivery of orders and worker satisfaction. While the maximisation of on-time deliveries has frequently been considered in past production planning research, the component of maximising worker satisfaction has typically been ignored. The assi...

The paper addresses the problem of maximizing the percentage of on-time jobs in a parallel machine environment with sequence dependent deterioration. The deterioration of each machine (and therefore of the job processing times) is a function of the sequence of jobs that have been processed by the machine. Two machine loading strategies are combined...

Wind farms produce electricity and provide a source of renewable energy. The growth in wind farm installations in the past 10 years has led to an increase in the number of wind turbines reaching the end of their manufacturing warranties. As a consequence, the wind industry is now facing a rising cost of unscheduled maintenance, which is pushing up...

In this paper, we develop a framework that integrates a discrete-event simulation model and integer programming (IP) model for patient admission planning and the intermediate term allocation of resource capacities. Two types of patients are considered in this study: new and existing. The simulation model is used to find the best balance between new...

Variability in length of treatment, increased patient demand, and resource limitations represent part of the complexity of scheduling patients in any outpatient clinic. This study presents a mixed-integer programming optimization model developed with the objective of maximizing resource utilization, while balancing human workload. A simulation mode...

Tactical planning of resources in healthcare clinics concerns elective patient admission planning and the intermediate term allocation of resource capacities. Its main objectives are to achieve equitable access for patients, to serve the strategically agreed number of patients, and to use resources efficiently. In this paper, we describe a simulati...

Data centers consume a phenomenal amount of energy, which can be significantly reduced by appropriately allocating resources using technologies such as virtualization, speed scaling, and powering off servers. This article proposes a unified methodology that combines these technologies under a single framework to efficiently operate data centers. In...

We develop a discrete event-based simulation framework that mimics the operations of a commercial size wind farm. Each turbine is treated as separate module, so that the simulation can be easily scaled up to more than one hundred turbines for a farm. Each turbine module includes a structural element sub-module, degradation sub-module, power generat...

ID: 471 Abstract Distributed generation differs from the central generation in that electricity is produced from many small and dispersed energy resources. A distributed power system integrating wind and solar energy is quite appealing as it mitigates carbon emissions and relieves line congestions. Power intermittency and equipment cost are the maj...

The rise in demand for specialized medi-cal services in the U.S has been recognized as one of the contributors to increased health care costs. Nuclear medicine is a specialized service that uses relatively new technologies and radiopharmaceuticals with a short half-life (minutes) for diagnosis and treatment of pa-tients. Nuclear medicine procedures...

Wind farms use several wind turbines to generate electricity and provide a renewable source of energy. However, due to large forces as a result of hourly and seasonal variations in wind speed and direction, wind turbines experience stochastic loading that often lead to failures of wind turbine components such as the gearbox and generator. Wind turb...