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Articles 1 - 30 of 3721

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Reliability-Informed Life Cycle Warranty Cost And Life Cycle Analysis Of Newly Manufactured And Remanufactured Units, Meng Li, Venkat P. Nemani, Jinqiang Liu, Michael A. Lee, Navaid Ahmed, Gül E. Okudan Kremer, Chao Hu Nov 2021

Reliability-Informed Life Cycle Warranty Cost And Life Cycle Analysis Of Newly Manufactured And Remanufactured Units, Meng Li, Venkat P. Nemani, Jinqiang Liu, Michael A. Lee, Navaid Ahmed, Gül E. Okudan Kremer, Chao Hu

Industrial and Manufacturing Systems Engineering Publications

Standard life cycle techniques such as life cycle warranty cost (LCWC) analysis and life cycle analysis (LCA) are used to respectively quantify the relative economical and environmental advantages of remanufactured goods while simultaneously identifying avenues for improvement. In this paper, we contribute to the literature on life cycle studies by incorporating reliability into LCWC analysis and LCA with the goal of improving long-term/multiple life cycle decision making. We develop a branched power-law model to incorporate the physical degradation mechanisms leading to reduced reuse rates of system parts over multiple life cycles. We then follow a standard LCA protocol to ...


Motivation Dynamics For Autonomous Composition Of Navigation Tasks, Paul B. Reverdy, Vasileios Vasilopoulos, Daniel E. Koditschek Aug 2021

Motivation Dynamics For Autonomous Composition Of Navigation Tasks, Paul B. Reverdy, Vasileios Vasilopoulos, Daniel E. Koditschek

Departmental Papers (ESE)

We physically demonstrate a reactive sensorimotor architecture for mobile robots whose behaviors are generated by motivation dynamics. Motivation dynamics uses a continuous dynamical system to reactively compose low-level control vector fields using valuation functions which capture the potentially competing influences of external stimuli relative to the system's own internal state. We show that motivation dynamics 1) naturally accommodates external stimuli through standard signal processing tools, and 2) can effectively encode a repetitive higher-level task by composing several low-level controllers to achieve a limit cycle in which the robot repeatedly navigates towards two alternatively valuable goal locations in a commensurately ...


Queuing-Inventory Models With Map Demands And Random Replenishment Opportunities, Srinivas R. Chakravarthy, B. Madhu Rao May 2021

Queuing-Inventory Models With Map Demands And Random Replenishment Opportunities, Srinivas R. Chakravarthy, B. Madhu Rao

Industrial & Manufacturing Engineering Publications

Combining the study of queuing with inventory is very common and such systems are referred to as queuing-inventory systems in the literature. These systems occur naturally in practice and have been studied extensively in the literature. The inventory systems considered in the literature generally include (s, S)-type. However, in this paper we look at opportunistic-type inventory replenishment in which there is an independent point process that is used to model events that are called opportunistic for replenishing inventory. When an opportunity (to replenish) occurs, a probabilistic rule that depends on the inventory level is used to determine whether to ...


Who Are Virtual Reality Headset Owners? A Survey And Comparison Of Headset Owners And Non-Owners, Jonathan W. Kelly, Lucia A. Cherep, Alex F. Lim, Taylor Doty, Stephen B. Gilbert May 2021

Who Are Virtual Reality Headset Owners? A Survey And Comparison Of Headset Owners And Non-Owners, Jonathan W. Kelly, Lucia A. Cherep, Alex F. Lim, Taylor Doty, Stephen B. Gilbert

Industrial and Manufacturing Systems Engineering Publications

The number of people who own a virtual reality (VR) head-mounted display (HMD) has reached a point where researchers can readily recruit HMD owners to participate remotely using their own equipment. However, HMD owners recruited online may differ from the university community members who typically participate in VR research. HMD owners (n=220) and non-owners (n=282) were recruited through two online work sites-Amazon's Mechanical Turk and Prolific-and an undergraduate participant pool. Participants completed a survey in which they provided demographic information and completed measures of HMD use, video game use, spatial ability, and motion sickness susceptibility. In the ...


Understanding Of Aerosol Transmission Of Covid 19 In Indoor Environment - Part 2: Approaches To Mitigation, Adama Barro, Cathal O'Toole, Jacob S. Lopez, Matthew Quinones, Sherene Moore May 2021

Understanding Of Aerosol Transmission Of Covid 19 In Indoor Environment - Part 2: Approaches To Mitigation, Adama Barro, Cathal O'Toole, Jacob S. Lopez, Matthew Quinones, Sherene Moore

Publications and Research

The challenge we face in implementing solutions for new HVAC ventilation and filtration design, is to effectively improve air quality for virus mitigation without losing performance efficiency. The purpose of this improvement is to decontaminate the occupied enclosed areas, reducing the transmission of the corona virus aerosol transmission. Our research seeks reliable approaches to mitigate the further spread of aerosol transmission in indoor spaces. The methodology is to examine innovative HVAC engineering solutions that combat epidemiological problems of Covid-19 for the post-pandemic era, by researching scholarly articles and ASHRAE journals. We are achieving the goal of finding highly efficient resolutions ...


Uri And Its Students: A Contract For The Provision Of A Safe Environment, Danielle Joan Beatrice May 2021

Uri And Its Students: A Contract For The Provision Of A Safe Environment, Danielle Joan Beatrice

Senior Honors Projects

DANIELLE BEATRICE (English; Philosophy; Business) URI and Its Students: A Contract for the Provision of a Safe Environment

Sponsor: Judith Swift (Communication Studies, Coastal Institute)

When students begin to attend college, they expect to be consumed with busy schedules, heavy workloads, and an exciting social life. Students do not anticipate being in dangerous situations. However, this does not mean that such situations do not occur. Therefore, it is essential to teach students to be active participants in educating themselves and their peers regarding prevention and response to emergency situations. My Honors Project aims to increase the awareness of safety-related issues ...


The Status Of Construction Jobsite Emergency Alert Systems In The Construction Industry, Steven E. Pulver May 2021

The Status Of Construction Jobsite Emergency Alert Systems In The Construction Industry, Steven E. Pulver

Construction Management Theses

There are various types of emergency alert systems available in the construction industry from the air horn to more complex remote and app-based systems. This study utilizes an industry survey to identify the most commonly used emergency alert methods on jobsites, and the industry professionals’ knowledge and perceptions of app-based and remote emergency alert systems. Results indicate that the air horn is the most commonly used method of emergency alerts, and the construction industry is willing to spend more on the remote emergency alert systems compared to the app-based emergency alert systems. The major concerns from the construction industry are ...


Reactive Planning For Mobile Manipulation Tasks In Unexplored Semantic Environments, Vasileios Vasilopoulos, Yiannis Kantaros, George J. Pappas, Daniel E. Koditschek May 2021

Reactive Planning For Mobile Manipulation Tasks In Unexplored Semantic Environments, Vasileios Vasilopoulos, Yiannis Kantaros, George J. Pappas, Daniel E. Koditschek

Departmental Papers (ESE)

Complex manipulation tasks, such as rearrangement planning of numerous objects, are combinatorially hard problems. Existing algorithms either do not scale well or assume a great deal of prior knowledge about the environment, and few offer any rigorous guarantees. In this paper, we propose a novel hybrid control architecture for achieving such tasks with mobile manipulators. On the discrete side, we enrich a temporal logic specification with mobile manipulation primitives such as moving to a point, and grasping or moving an object. Such specifications are translated to an automaton representation, which orchestrates the physical grounding of the task to mobility or ...


Carbon Nanotori Structures For Thermal Transport Applications On Lubricants, Jaime Taha-Tijerina, Karla Aviña, Juan Manuel Martínez, Patsy Yessenia Arquieta-Guillén, Marlon González-Escobedo Apr 2021

Carbon Nanotori Structures For Thermal Transport Applications On Lubricants, Jaime Taha-Tijerina, Karla Aviña, Juan Manuel Martínez, Patsy Yessenia Arquieta-Guillén, Marlon González-Escobedo

Manufacturing & Industrial Engineering Faculty Publications and Presentations

Carbon nanostructures have been recently applied to improve industrial manufacturing processes and other materials; such is the case for lubricants used in the metal-mechanic industry. Nanotori are toroidal carbon nanostructures, obtained from chemical treatment of multi-wall carbon nanotubes (MWCNTs). This material has been shown to have superb anti-wear and friction reduction performance, having the ability to homogeneously disperse within water in concentrations between 1-2 wt.%. Obtained results of these novel nanostructures under water mixtures and novel additives were a set point to our studies in different industrial lubricants. In the present work, nanotori structures have been applied in various filler ...


Administrative Law In The Automated State, Cary Coglianese Apr 2021

Administrative Law In The Automated State, Cary Coglianese

Faculty Scholarship at Penn Law

In the future, administrative agencies will rely increasingly on digital automation powered by machine learning algorithms. Can U.S. administrative law accommodate such a future? Not only might a highly automated state readily meet longstanding administrative law principles, but the responsible use of machine learning algorithms might perform even better than the status quo in terms of fulfilling administrative law’s core values of expert decision-making and democratic accountability. Algorithmic governance clearly promises more accurate, data-driven decisions. Moreover, due to their mathematical properties, algorithms might well prove to be more faithful agents of democratic institutions. Yet even if an automated ...


Reduction Of Water In Manure Storage, Kevin Brown, Nathan Downey, Nathan Ehrlich, Michael E. Anderson, Jacek A. Koziel Apr 2021

Reduction Of Water In Manure Storage, Kevin Brown, Nathan Downey, Nathan Ehrlich, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Posters

  • Our client has an abnormally high rate of rise in their deep storage manure pits. The Central Iowa pits are on a three-barn site, housing 4200 head of swine at all times of operation. The excess water has been causing an increase in the pit pumping and urgency.


Cline Design Creations Shipping Department Efficiency, Owen Cline, William Dembicki, Kyle Gilbert, Colin Mckay, Michael E. Anderson, Jacek A. Koziel Apr 2021

Cline Design Creations Shipping Department Efficiency, Owen Cline, William Dembicki, Kyle Gilbert, Colin Mckay, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Posters

Cline Design is a business that directly sells to the consumer online and wants to reduce the amount of time and effort required to package their custom sign fabrication. Consumers are rapidly becoming accustomed to shorter shipping times making shipping a key component to the company's success.


Cadman 5000 M-Xl Manure Application Hose Reel Speed Up, Brayden Arnote, Tanner Calderwood, Mason Heaton, Matthew Melson, Michael E. Anderson, Jacek A. Koziel Apr 2021

Cadman 5000 M-Xl Manure Application Hose Reel Speed Up, Brayden Arnote, Tanner Calderwood, Mason Heaton, Matthew Melson, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Posters

  • Increase retrieval rate of manure application hose to decrease down time.


Henderson Part Removal From Laser Table, Austin Larsen, Colby Klipping, James Hadacek, Steven Langel, Michael E. Anderson, Jacek A. Koziel Apr 2021

Henderson Part Removal From Laser Table, Austin Larsen, Colby Klipping, James Hadacek, Steven Langel, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Posters

  • Henderson has multiple large cut tables with parts of various weights that require the operators to climb/crawl on the table to remove parts. Operators have a high risk of back and shoulder strains due to lifting or stretching to remove parts from the center of the table. Seven (7) injuries have been recorded in this area over the past two (2) years.


Prototype: "The Pooper Picker Upper", Corgan Davis, Morgan Ely, Danielle (Abby) Espinosa-Gonzalez Bellolio, Benjamin Wozniak, Michael E. Anderson, Jacek A. Koziel Apr 2021

Prototype: "The Pooper Picker Upper", Corgan Davis, Morgan Ely, Danielle (Abby) Espinosa-Gonzalez Bellolio, Benjamin Wozniak, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Posters

  • Design, manufacture and implement a prototype that improves the cleanliness of the chicken coop, while making the process effective and more time efficient.
  • Reduce strain on the client by incorporating ergonomic driven design elements.


Producing Canadian Firelogs, Brent Foster, Daniel Koenig, Michael E. Anderson, Jacek A. Koziel Apr 2021

Producing Canadian Firelogs, Brent Foster, Daniel Koenig, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Posters

  • Does the production of Canadian Firelogs and sale to gas stations and home stores offer a possibility to be a viable business in Iowa?
  • Need for a safer and more efficient recreational burn


External Storage Cover To Reduce Dilution, Samuel Blair, John Hensel, William Kellner, Caleb Rietveld, Michael E. Anderson, Jacek A. Koziel Apr 2021

External Storage Cover To Reduce Dilution, Samuel Blair, John Hensel, William Kellner, Caleb Rietveld, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Posters

  • Open containment is susceptible to rain and other elements, which leads to dilution
  • Dilution reduces the value of the manure as fertilizer
  • Dilution in storage structures increases overall cost to pump manure out of the tanks


Smithfield Tank Nutrient Cover, John Hensel, William Kellner, Samuel Blair, Caleb Rietveld, Michael E. Anderson, Jacek A. Koziel Apr 2021

Smithfield Tank Nutrient Cover, John Hensel, William Kellner, Samuel Blair, Caleb Rietveld, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

  • To model a cover structure for a Slurry Store
  • Model tarp attachment system
  • Limit precipitation in Slurry Store to avoid dilution of nutrients


Shipment Efficiency, William Dembicki, Colin Mckay, Owen Cline, Kyle Gilbert, Michael E. Anderson, Jacek A. Koziel Apr 2021

Shipment Efficiency, William Dembicki, Colin Mckay, Owen Cline, Kyle Gilbert, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

  • To improve the efficiency of the shipping department of Cline Design
  • Places like Amazon have consumers used to 2-day shipping


Cadman 5000 M-Xl Reel Speed Up, Brayden Arnote, Mason Heaton, Matthew Melson, Tanner Calderwood, Michael E. Anderson, Jacek A. Koziel Apr 2021

Cadman 5000 M-Xl Reel Speed Up, Brayden Arnote, Mason Heaton, Matthew Melson, Tanner Calderwood, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

Our purpose for the Capstone Project, was to improve the efficiency of CFI Custom's manure application process.


Henderson Part Removal, James Hadacek, Colby Klipping, Steven Langel, Austin Larsen, Michael E. Anderson, Jacek A. Koziel Apr 2021

Henderson Part Removal, James Hadacek, Colby Klipping, Steven Langel, Austin Larsen, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

  • The purpose of this project is to design a system to aid in the clearing of a laser cutting table at Henderson Products. Upon completion of this project, we hope our client will implement the use of this project within their process.
  • As a team, we are excited to be taking on this project. We see it as an opportunity to use skills learned at the university level and will strive to make sure our work meet the deliverables set forth by our client.


Prototype: "Pooper Picker Upper", Danielle (Abby) Espinosa-Gonzalez Bellolio, Corgan Davis, Morgan Ely, Benjamin Wozniak, Michael E. Anderson, Jacek A. Koziel Apr 2021

Prototype: "Pooper Picker Upper", Danielle (Abby) Espinosa-Gonzalez Bellolio, Corgan Davis, Morgan Ely, Benjamin Wozniak, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

Design, manufacture and implement a prototype that improves:

  • Cleanliness of chicken coop
  • Ergonomic conditions of client by minimizing strain
  • The process by making it quicker and more efficient.


Smithfield Tarp Nutrient Cover, Samuel Blair, Caleb Rietveld, John Hensel, William Kellner, Michael E. Anderson, Jacek A. Koziel Apr 2021

Smithfield Tarp Nutrient Cover, Samuel Blair, Caleb Rietveld, John Hensel, William Kellner, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

Smithfield is the world's leading pork processor and hog producer. They are based out of Virginia and have a large footprint in Iowa with their many pork-producing farms. With all these farms comes a large amount of waste that is used as crop fertilizer. This fertilizer is then stored in a slurry store system or in-ground concrete basin. These externally exposed nutrient storage systems for Smithfield are prone to filling with rain and snow precipitation causing nutrient dilution and, in extreme cases, the potential for overflow. In Iowa, the rate of precipitation per year is greater than the rate ...


Shipment Efficiency, William Dembicki, Kyle Gilbert, Owen Cline, Colin Mckay, Michael E. Anderson, Jacek A. Koziel Apr 2021

Shipment Efficiency, William Dembicki, Kyle Gilbert, Owen Cline, Colin Mckay, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

Cline Design Creations produces custom-made plasma cut steel signs for customers worldwide; they are produced and shipped from one location in Guernsey, Iowa. Their packaging and shipping room is 15 ft by 25 ft, so saving space is a priority for this project. Cline Design Creations wants to redesign this room for faster packaging, as the packaging process takes up a sizable part of the total time required to get the product out the door. Since the company has very few employees, the production of new signs and the packaging of already cut signs cannot occur simultaneously, so if time ...


Cadman 5000 W-Xl Reel Speedup, Mason Heaton, Matthew Melson, Tanner Calderwood, Brayden Arnote, Michael E. Anderson, Jacek A. Koziel Apr 2021

Cadman 5000 W-Xl Reel Speedup, Mason Heaton, Matthew Melson, Tanner Calderwood, Brayden Arnote, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

Increasing the Retrieval rate of a 2000 ft of manure application hose to decrease the downtime of the manure application system.

  • CFI Customs is a Family-owned and operated custom manure pumping business that specializes in liquid swine manure. They pump anywhere from 18-26 million gallons a season (but is always growing), mostly around central Iowa. Their customers vary from small 100,000-gallon sites to large 6-million-gallon sites. They apply using a Dragline system to pump 1200 GPM from the building to the application site 3.5 miles away.
  • The client is looking to lower their downtime in between fields by ...


Henderson Laser Table Part Removal, James Hadacek, Colby Klipping, Steven Langel, Austin Larsen, Michael E. Anderson, Jacek A. Koziel Apr 2021

Henderson Laser Table Part Removal, James Hadacek, Colby Klipping, Steven Langel, Austin Larsen, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

Henderson Products manufacturing has multiple large laser cutting tables with parts of various weights and sizes that require the operators to climb/crawl on the table to remove parts. Operators have an elevated risk of back and shoulder strains due to lifting and/or stretching to remove parts from the center of the table. Seven injuries have been recorded in this area over the past two years. This creates employee downtime due to injury, not to mention the risk of legal implications. Very few options exist that are not completely automated. Our goal and solution are a tool that can ...


Chicken Coop Cleaner Prototype: 'Pooper-Picker-Upper', Danielle (Abby) Espinosa-Gonzalez Bellolio, Corgan Davis, Morgan Ely, Benjamin Wozniak, Michael E. Anderson, Jacek A. Koziel Apr 2021

Chicken Coop Cleaner Prototype: 'Pooper-Picker-Upper', Danielle (Abby) Espinosa-Gonzalez Bellolio, Corgan Davis, Morgan Ely, Benjamin Wozniak, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

Our client Fred Davis is a Part-time farmer who works on his small-scale family farm called Davis Farms, located in Sioux City, Iowa. Cleaning chicken coops on a consumer level is a long and tedious process that can be dangerous to your health. The heat and the repetitive movements of bending over and shoveling can cause strain on the body. Our main focus in this project is to manufacture a prototype that will improve cleanliness and time efficiency. In turn, the Prototype will minimize the strain caused on our client's body; improvement will be demonstrated through our gradual ergonomic-focused ...


Water Reduction In Swine Manure Storage, Nathan Downey, Kevin Brown, Nathan Ehrlich, Michael E. Anderson, Jacek A. Koziel Apr 2021

Water Reduction In Swine Manure Storage, Nathan Downey, Kevin Brown, Nathan Ehrlich, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

  • Our client manages a three barn 4200 head swine facility with deep pit manure storage.
  • Abnormal weekly rise in deep pit manure storage levels


Canadian Log Concept, Daniel Koenig, Brent Foster, Michael E. Anderson, Jacek A. Koziel Apr 2021

Canadian Log Concept, Daniel Koenig, Brent Foster, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

  • Do Canadian Firelogs provide a better alternative than commercial firewood?


Reduction Of Water In Swine Manure Storage, Nathan Downey, Nathan Ehrlich, Kevin Brown, Michael E. Anderson, Jacek A. Koziel Apr 2021

Reduction Of Water In Swine Manure Storage, Nathan Downey, Nathan Ehrlich, Kevin Brown, Michael E. Anderson, Jacek A. Koziel

TSM 416 Technology Capstone Projects

Our client manages a three barn 4200 head swine facility with deep pit manure storage. They have noticed at this current site that there is an abnormal weekly rise in deep pit manure storage levels. The manager has narrowed this issue down to excess water usage due to the in-barn flow rate.