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

Acuta Enews December 2014 Issue 12 Dec 2014

Acuta Enews December 2014 Issue 12

ACUTA Newsletters

Board Approves Slate of Nominees

What's on My Desk

Microsoft Lync Roundtable

What's on Your Desk?

Bring Sessions to Your Desktop or Tablet

Uphill Battle to Fund Wireless Network Growth

Board Report

Randy's Top 10 Info Links

VoLTE Plus Wi-Fi

Check It Out


Coordinated Navigation Of Multiple Independent Disk-Shaped Robots, C. Serkan Karagoz, H. Isil Bozma, Daniel E. Koditschek Dec 2014

Coordinated Navigation Of Multiple Independent Disk-Shaped Robots, C. Serkan Karagoz, H. Isil Bozma, Daniel E. Koditschek

Departmental Papers (ESE)

This paper addresses the coordinated navigation of multiple independently actuated disk-shaped robots-all placed within the same disk-shaped workspace. Assuming perfect sensing, shared-centralized communications and computation, as well as perfect actuation, we encode complete information about the goal, obstacles, and workspace boundary using an artificial potential function over the configuration space of the robots’ simultaneous nonoverlapping positions. The closed-loop dynamics governing the motion of each (velocity-controlled) robot take the form of the appropriate projection of the gradient of this function. We impose (conservative) restrictions on the allowable goal positions that yield sufficient conditions for convergence: We prove that this construction is ...


The Cadet Training Program Versus The Student Certification Program: A Study Of It- Support Training Programs At Western Kentucky University, Michael Courtney Moore Dec 2014

The Cadet Training Program Versus The Student Certification Program: A Study Of It- Support Training Programs At Western Kentucky University, Michael Courtney Moore

Masters Theses & Specialist Projects

Technology is a critical component of modern-day success. Advancements in technology have improved communication between individuals and companies. Technological advancements have allowed students to earn college degrees online. People who habitually use technology expect a high level of performance and support. As new technologies are implemented, such as complex web services or new operating systems, the dependence for information technology (IT) support grows in demand. Even learning curves can be cumbersome without proper assistance from IT professionals. Companies and institutions must accommodate user needs by implementing fast, efficient, and friendly support. In order to offer optimal customer support, representatives must ...


Second Order-Response Surface Model For The Automated Parameter Tuning Problem, Aldy Gunawan, Hoong Chuin Lau Dec 2014

Second Order-Response Surface Model For The Automated Parameter Tuning Problem, Aldy Gunawan, Hoong Chuin Lau

Research Collection School Of Information Systems

Several automated parameter tuning procedures/configurators have been proposed in order to find the best parameter setting for a target algorithm. These configurators can generally be classified into model-free and model-based approaches. We introduce a recent approach which is based on the hybridization of both approaches. It combines the Design of Experiments (DOE) and Response Surface Methodology (RSM) with prevailing model-free techniques. DOE is mainly used for determining the importance of parameters. A First Order-RSM is initially employed to define the promising region for the important parameters. A Second Order-RSM is then built to approximate the center point as well ...


Optimization Model For A Thermochemical Biofuels Supply Network Desig N, Yihua Li, Tristan Brown, Guiping Hu Dec 2014

Optimization Model For A Thermochemical Biofuels Supply Network Desig N, Yihua Li, Tristan Brown, Guiping Hu

Industrial and Manufacturing Systems Engineering Publications

This research focuses on the supply chain network design of a fast pyrolysis and hydroprocessing production pathway by utilizing corn stover as feedstock to produce gasoline and diesel fuel. A mixed integer linear programming (MILP) model was formulated to optimize fast pyrolysis and hydroprocessing facility locations and capacities to minimize total system cost, including the feedstock collecting costs, capital costs of facilities, and transportation costs. The economic feasibility of building a new biorefinery in Iowa was analyzed based on the optimal supply chain configuration and savings in bio-oil logistic costs to the centralized upgrading facility.


An Oligopoly Model To Analyze The Market And Social Welfare For Green Manufacturing Industry, Guiping Hu, Lizhi Wang, Yihsu Chen, Bopaya Bidanda Dec 2014

An Oligopoly Model To Analyze The Market And Social Welfare For Green Manufacturing Industry, Guiping Hu, Lizhi Wang, Yihsu Chen, Bopaya Bidanda

Industrial and Manufacturing Systems Engineering Publications

As public concerns on sustainable economic development increase, an increasing number of manufactured products have found their environmentally preferable alternatives. In this study, we propose an oligopoly game theoretical model to analyze the competition between the green and ordinary manufacturing sectors. We identify cost efficiency and innovative design as key elements to the survival of green products. We also find that the effectiveness of Pigouvian tax and subsidy policies depend on product characteristics, market structures, as well as targeted results. Our small empirical examples on Corolla vs. Prius and Incandescent lamp vs. Compact fluorescent lamp (CFL) show that our modeling ...


Variable Speed Limit Strategies To Reduce The Impacts Of Traffic Flow Breakdown At Recurrent Freeway Bottlenecks, Ali Darroudi Nov 2014

Variable Speed Limit Strategies To Reduce The Impacts Of Traffic Flow Breakdown At Recurrent Freeway Bottlenecks, Ali Darroudi

FIU Electronic Theses and Dissertations

Variable Speed Limit (VSL) strategies identify and disseminate dynamic speed limits that are determined to be appropriate based on prevailing traffic conditions, road surface conditions, and weather conditions. This dissertation develops and evaluates a shockwave-based VSL system that uses a heuristic switching logic-based controller with specified thresholds of prevailing traffic flow conditions. The system aims to improve operations and mobility at critical bottlenecks. Before traffic breakdown occurrence, the proposed VSL’s goal is to prevent or postpone breakdown by decreasing the inflow and achieving uniform distribution in speed and flow. After breakdown occurrence, the VSL system aims to dampen traffic ...


Acuta Enews November 2014 Issue 11 Nov 2014

Acuta Enews November 2014 Issue 11

ACUTA Newsletters

Nominate for Ruth A. Michalecki Leadership Award

One Seminar, Many Benefits

Bring Sessions to Your Desktop or Tablet

What's on Your Desk?

Nominate for the Board by Nov. 7

Nominations Open for Institutional Excellence Awards

Security? Room for Improvement

Randy's Top 10 Info Links

Better Mobile 911 Rules

Welcome New Members

Check It Out


Vulnerability Assessment And Re-Routing Of Freight Trains Under Disruptions: A Coal Supply Chain Network Application, Ridvan Gedik, Hugh Medal, Chase Rainwater, Edward A. Pohl, Scott J. Mason Nov 2014

Vulnerability Assessment And Re-Routing Of Freight Trains Under Disruptions: A Coal Supply Chain Network Application, Ridvan Gedik, Hugh Medal, Chase Rainwater, Edward A. Pohl, Scott J. Mason

Mechanical and Industrial Engineering Faculty Publications

In this paper, we present a two-stage mixed integer programming (MIP) interdiction model in which an interdictor chooses a limited amount of elements to attack first on a given network, and then an operator dispatches trains through the residual network. Our MIP model explicitly incorporates discrete unit flows of trains on the rail network with time-variant capacities. A real coal rail transportation network is used in order to generate scenarios to provide tactical and operational level vulnerability assessment analysis including rerouting decisions, travel and delay costs analysis, and the frequency of interdictions of facilities for the dynamic rail system.


Desert Rhex Technical Report: Tengger Desert Trip, Sonia F. Roberts, Jeffrey M. Duperret, Xinwan Li, Hesheng Wang, D. E. Koditschek Nov 2014

Desert Rhex Technical Report: Tengger Desert Trip, Sonia F. Roberts, Jeffrey M. Duperret, Xinwan Li, Hesheng Wang, D. E. Koditschek

Technical Reports (ESE)

Desertification is a long-standing issue in China, but research on the processes of desertification is limited by availability of personnel and technical equipment. This suggests a perfect application and further testing ground for the mobile desert sensing technology described in a previous technical report. We describe here the first of two trips to the Tengger Desert as part of a collaborative effort to bring Desert RHexes to China, with the goal of this trip being to discover and address potential locomotor challenges. Our robots were able to ascend 20-degree slopes with an 8.5kg payload, indicating that they could indeed ...


Desert Rhex Technical Report: Jornada And White Sands Trip, Sonia Roberts, Jeff Duperret, Aaron M. Johnson, Scott Van Pelt, Ted Zobeck, Nick Lancaster, Daniel E. Koditschek Nov 2014

Desert Rhex Technical Report: Jornada And White Sands Trip, Sonia Roberts, Jeff Duperret, Aaron M. Johnson, Scott Van Pelt, Ted Zobeck, Nick Lancaster, Daniel E. Koditschek

Technical Reports (ESE)

Researchers in a variety of fields, including aeolian science, biology, and environmental science, have already made use of stationary and mobile remote sensing equipment to increase their variety of data collection opportunities. However, due to mobility challenges, remote sensing opportunities relevant to desert environments and in particular dune fields have been limited to stationary equipment. We describe here an investigative trip to two well-studied experimental deserts in New Mexico with D-RHex, a mobile remote sensing platform oriented towards desert research. D-RHex is the latest iteration of the RHex family of robots, which are six-legged, biologically inspired, small (10kg) platforms with ...


Traccs: Trajectory-Aware Coordinated Urban Crowd-Sourcing, Cen Chen, Shih-Fen Cheng, Aldy Gunawan, Archan Misra, Koustuv Dasgupta, Deepthi Chander Nov 2014

Traccs: Trajectory-Aware Coordinated Urban Crowd-Sourcing, Cen Chen, Shih-Fen Cheng, Aldy Gunawan, Archan Misra, Koustuv Dasgupta, Deepthi Chander

Research Collection School Of Information Systems

We investigate the problem of large-scale mobile crowd-tasking, where a large pool of citizen crowd-workers are used to perform a variety of location-specific urban logistics tasks. Current approaches to such mobile crowd-tasking are very decentralized: a crowd-tasking platform usually provides each worker a set of available tasks close to the worker's current location; each worker then independently chooses which tasks she wants to accept and perform. In contrast, we propose TRACCS, a more coordinated task assignment approach, where the crowd-tasking platform assigns a sequence of tasks to each worker, taking into account their expected location trajectory over a wider ...


Cross-Layer Provision Of Future Cellular Networks: A Wmmse-Based Approach, Hadi Baligh, Mingyi Hong, Wei-Cheng Liao, Zhi-Quan Luo, Meisam Razaviyayn, Maziar Sanjabi, Ruoyu Sun Nov 2014

Cross-Layer Provision Of Future Cellular Networks: A Wmmse-Based Approach, Hadi Baligh, Mingyi Hong, Wei-Cheng Liao, Zhi-Quan Luo, Meisam Razaviyayn, Maziar Sanjabi, Ruoyu Sun

Industrial and Manufacturing Systems Engineering Publications

To cope with the growing demand for wireless data and to extend service coverage, future fifth-generation (5G) networks will increasingly rely on the use of low-power nodes to support massive connectivity in a diverse set of applications and services [1]. To this end, virtualized and mass-scale cloud architectures are proposed as promising technologies for 5G in which all the nodes are connected via a backhaul network and managed centrally by such cloud centers. The significant computing power made available by the cloud technologies has enabled the implementation of sophisticated signal processing algorithms, especially by way of parallel processing, for both ...


Predicting Solar Irradiance Using Time Series Neural Networks, Ahmad Alzahrani, Jonathan W. Kimball, Cihan H. Dagli Nov 2014

Predicting Solar Irradiance Using Time Series Neural Networks, Ahmad Alzahrani, Jonathan W. Kimball, Cihan H. Dagli

Electrical and Computer Engineering Faculty Research & Creative Works

Increasing the accuracy of prediction improves the performance of photovoltaic systems and alleviates the effects of intermittence on the systems stability. A Nonlinear Autoregressive Network with Exogenous Inputs (NARX) approach was applied to the Vichy-Rolla National Airport's photovoltaic station. The proposed model uses several inputs (e.g. time, day of the year, sky cover, pressure, and wind speed) to predict hourly solar irradiance. Data obtained from the National Solar Radiation Database (NSRDB) was used to conduct simulation experiments. These simulations validate the use of the proposed model for short-term predictions. Results show that the NARX neural network notably outperformed ...


Instances For Sugarcane Harvest Logistics In Louisiana, Kamal Lamsal, Philip C. Jones, Barrett W. Thomas Oct 2014

Instances For Sugarcane Harvest Logistics In Louisiana, Kamal Lamsal, Philip C. Jones, Barrett W. Thomas

Tippie College of Business Publications

This zip file contains the 11 instances used in the paper “Continuous time scheduling for sugarcane harvest logistics in Louisiana.” (https://doi.org/10.1080/00207543.2015.1052156) You can find the publication details for that paper at http://myweb.uiowa.edu/bthoa/iowa/Research.html. The paper contains all of the details regarding the construction of the sets.

In summary, there are 11 mills and approximately 475 farms in Louisiana. The National Agricultural Statistics Service (http://quickstats.nass.usda.gov/results/87A51B62-DE8D-322D-8C98-88FEF17FBB6F) provide zip-code level addresses for 456 farms, and The American Sugar League (http://www.amscl.org/factories ...


Quantifying Economic Benefits For Rail Infrastructure Projects, Suzanna Long, Ruwen Qin, John Betak, Akhilesh Ojha, John J. Myers Oct 2014

Quantifying Economic Benefits For Rail Infrastructure Projects, Suzanna Long, Ruwen Qin, John Betak, Akhilesh Ojha, John J. Myers

Engineering Management and Systems Engineering Faculty Research & Creative Works

This project identifies metrics for measuring the benefit of rail infrastructure projects for key stakeholders. It is important that stakeholders with an interest in community economic development play an active role in the development of the rail network. Economic development activities in both rural and urban settings are essential if a nation is to realize growth and prosperity. Many communities have developed goals and visions to establish an economic development program, but they often fail to achieve their goals due to uncertainties during the project selection and planning process. Communities often select a project from a vast pool of ideas ...


Effect Of Anthropometric Adjustments On Bmd And Bmc Z-Scores In A Population Of Prader-Willi Syndrome Pediatric Patients, Amanda E. Marker, David F. Short, Talia Eldar-Geva, Harry J. Hirsch, Varda Gross-Tsur, Maayan Tiomkin, Ari Zimran, Thomas N. Hangartner Oct 2014

Effect Of Anthropometric Adjustments On Bmd And Bmc Z-Scores In A Population Of Prader-Willi Syndrome Pediatric Patients, Amanda E. Marker, David F. Short, Talia Eldar-Geva, Harry J. Hirsch, Varda Gross-Tsur, Maayan Tiomkin, Ari Zimran, Thomas N. Hangartner

Biomedical, Industrial & Human Factors Engineering Faculty Publications

Two adjustment models were applied to a dataset of bone-mineral density (BMD) and bone-mineral content (BMC) from dual-energy x-ray absorptiometry (DXA) measurements of pediatric patients with Prader-Willi Syndrome (PWS). One model used weight, height and % body fat (WHF) in the calculation of Z-scores in addition to race, sex and age already included in the standard model. As percent body fat is not always available, a second model with only weight and height was also examined (WH).


Acuta Enews October 2014 Issue 10 Oct 2014

Acuta Enews October 2014 Issue 10

ACUTA Newsletters

Nominate for ACUTA Board

Social Media Planning

U.S. Campuses Spend $4 Billion Annually on Unmanaged, Unmeasured Investments

October is National Cyber Security Awareness Month

Wasting Time on Daylight Saving Time?

Nominations Open for Institutional Excellence Awards

Board Report

VoIP: Voice Quality Problems & Recommendations

Randy's Top 10 Info Links

Welcome New Members

Check It Out


Multi-Agent Orienteering Problem With Time-Dependent Capacity Constraints, Cen Chen, Shih-Fen Cheng, Hoong Chuin Lau Oct 2014

Multi-Agent Orienteering Problem With Time-Dependent Capacity Constraints, Cen Chen, Shih-Fen Cheng, Hoong Chuin Lau

Research Collection School Of Information Systems

In this paper, we formulate and study the Multi-agent Orienteering Problem with Time-dependent Capacity Constraints (MOPTCC). MOPTCC is similar to the classical orienteering problem at single-agent level: given a limited time budget, an agent travels around the network and collects rewards by visiting different nodes, with the objective of maximizing the sum of his collected rewards. The most important feature we introduce in MOPTCC is the inclusion of multiple competing agents. All agents in MOPTCC are assumed to be self-interested, and they interact with each other when arrive at certain nodes simultaneously. As all nodes are capacitated, if a particular ...


Survey On Wakeup Scheduling For Environmentally-Powered Wireless Sensor Networks, Alvin Cerdena Valera, Wee-Seng Soh, Hwee-Pink Tan Oct 2014

Survey On Wakeup Scheduling For Environmentally-Powered Wireless Sensor Networks, Alvin Cerdena Valera, Wee-Seng Soh, Hwee-Pink Tan

Research Collection School Of Information Systems

Advances in energy harvesting technologies and ultra low-power computing and communication devices are enabling the realization of environmentally-powered wireless sensor networks (EPWSNs). Because of limited and dynamic energy supply, EPWSNs are duty-cycled to achieve energy-neutrality, a condition where the energy demand does not exceed the energy supply. Duty cycling entails nodes to sleep and wakeup according to a wakeup scheduling scheme. In this paper, we survey the various wakeup scheduling schemes, with focus on their suitability for EPWSNs. A classification scheme is proposed to characterize existing wakeup scheduling schemes, with three main categories, namely, asynchronous, synchronous, and hybrid. Each wakeup ...


Hippi Care Hospital: Towards Proactive Business Processes In Emergency Room Services, Kar Way Tan, Venky Shankaraman Oct 2014

Hippi Care Hospital: Towards Proactive Business Processes In Emergency Room Services, Kar Way Tan, Venky Shankaraman

Research Collection School Of Information Systems

It was 2.35 am on a Saturday morning. Wiki Lim, process specialist from the Process Innovation Centre (PIC) of Hippi Care Hospital (HCH), desperately doodling on her notepad for ideas to improve service delivery at HCH’s Emergency Department (ED). HCH has committed to the public that its ED would meet the service quality criterion of serving 90% of A3 and A4 patients, non-emergency patients with moderate to mild symptoms, within 90 minutes of their arrival at the ED. The ED was not able to meet this performance goal and Dr. Edward Kim, the head of the ED at ...


A Systems Approach To Healthcare: Agent-Based Modeling, Community Mental Health, And Population Well-Being, Barry G. Silverman, Nancy Hanrahan, Gnana K. Bharathy, Kim Gordon, Dan Johnson Sep 2014

A Systems Approach To Healthcare: Agent-Based Modeling, Community Mental Health, And Population Well-Being, Barry G. Silverman, Nancy Hanrahan, Gnana K. Bharathy, Kim Gordon, Dan Johnson

Departmental Papers (ESE)

Purpose

Explore whether agent-based modeling and simulation can help healthcare administrators discover interventions that increase population wellness and quality of care while, simultaneously, decreasing costs. Since important dynamics often lie in the social determinants outside the health facilities that provide services, this study thus models the problem at three levels (individuals, organizations, and society).

Methods

The study explores the utility of translating an existing (prize winning) software for modeling complex societal systems and agent's daily life activities (like a Sim City style of software), into a desired decision support system. A case study tests if the 3 levels of ...


A Control-Chart Based Method For Solder Joint Crack Detection, Jianbiao Pan Sep 2014

A Control-Chart Based Method For Solder Joint Crack Detection, Jianbiao Pan

Industrial and Manufacturing Engineering

Many researchers have used different failure criteria in published solder joint reliability studies. Since the reported timeto-failure would be different if different failure criteria were used, it would be difficult to compare the reported reliability life of solder joints from one study to another. The purpose of this study is to evaluate the effect of failure criteria on the reported thermal fatigue life and determine which failure criterion could detect failure sooner. First, the application of the control-chart-based method in a thermal cycling reliability study is described. The reported time-to-failure data were then compared based on four different failure criteria ...


Acuta Enews September 2014 Issue 9 Sep 2014

Acuta Enews September 2014 Issue 9

ACUTA Newsletters

DAS Forum Produces Guidelines

Institutional Excellence

OUTSOURCE ON THE RISE

VoIP, Dial Tone, and Outages

Is Your Password Secure?

ACUTA Listserv Is a Valuable Resource

Board Report

The CIO and CFO Need a Strong Partnership

Randy's Top 10 Info Links

Welcome New Members

Check It Out


Supply Chain Design Under Uncertainty For Advanced Biofuel Production Based On Bio-Oil Gasification, Qi Li, Guiping Hu Sep 2014

Supply Chain Design Under Uncertainty For Advanced Biofuel Production Based On Bio-Oil Gasification, Qi Li, Guiping Hu

Industrial and Manufacturing Systems Engineering Publications

An advanced biofuels supply chain is proposed to reduce biomass transportation costs and take advantage of the economics of scale for a gasification facility. In this supply chain, biomass is converted to bio-oil at widely distributed small-scale fast pyrolysis plants, and after bio-oil gasification, the syngas is upgraded to transportation fuels at a centralized biorefinery. A two-stage stochastic programming is formulated to maximize biofuel producers' annual profit considering uncertainties in the supply chain for this pathway. The first stage makes the capital investment decisions including the locations and capacities of the decentralized fast pyrolysis plants as well as the centralized ...


Solution Sensitivity-Based Scenario Reduction For Stochastic Unit Commitment, Yonghan Feng, Sarah M. Ryan Sep 2014

Solution Sensitivity-Based Scenario Reduction For Stochastic Unit Commitment, Yonghan Feng, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Publications

A two-stage stochastic program is formulated for day-ahead commitment of thermal generating units to minimize total expected cost considering uncertainties in the day-ahead load and the availability of variable generation resources. Commitments of thermal units in the stochastic reliability unit commitment are viewed as first-stage decisions, and dispatch is relegated to the second stage. It is challenging to solve such a stochastic program if many scenarios are incorporated. A heuristic scenario reduction method termed forward selection in recourse clusters (FSRC), which selects scenarios based on their cost and reliability impacts, is presented to alleviate the computational burden. In instances down-sampled ...


Dexterity: An Indicator Of Future Performance In Beginning Welders?, A. Preston Byrd, Richard Stone, Ryan G. Anderson Sep 2014

Dexterity: An Indicator Of Future Performance In Beginning Welders?, A. Preston Byrd, Richard Stone, Ryan G. Anderson

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

This study examined the use of dexterity to indicate future performance of beginning welders to select participants for welding training programs. With a high demand for welders, it is imperative that welding training programs be efficient, which can be time consuming (Stone, Watts, & Zhong, 2011). The time required to train certified welders is one of the obstacles training programs face. Many occupational fields have tried to predict a student’s future performance before admitting them into a training program by analyzing their dexterous ability. This study utilized the Complete Minnesota Dexterity Test (CMDT) to examine participants’ dexterity during a welding ...


Reducing Beginning Welders’ Anxiety By Integrating Virtual Reality Simulations, A. Preston Byrd, Richard Stone, Ryan G. Anderson Sep 2014

Reducing Beginning Welders’ Anxiety By Integrating Virtual Reality Simulations, A. Preston Byrd, Richard Stone, Ryan G. Anderson

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

This study examined the use of virtual reality to reduce the anxiety of individuals in a welding training program. Byrd and Anderson (2012) posited that with the need for welders finding a more efficient way of training has become a necessity. With the multiple safety concerns related to the welding profession numerous triggers of anxiety are present. This study utilized the VRTEX® 360 virtual reality welding simulator to examine if virtual reality could reduce anxiety in welders. Several training programs were utilized that integrated the virtual reality welding simulator. Researchers recorded anxiety related measures by utilizing a BioHarness® data logger ...


Acuta Enews August 2014 Vol. 43, No. 8 Aug 2014

Acuta Enews August 2014 Vol. 43, No. 8

ACUTA Newsletters

In this Issue...

1 The Leadership Attitude

2 Fire on Sewanee's Campus

2 Webinar: WUSTL's Award-Winning EMC Project

3 Getting Cloud Credit

4 Register for Fall Seminar in Boston

5 Info Links

6 Board Report

6 Webinar: Requirements to Make Your Campus Wireless Friendly

7 ACUTA Member Benefit: Video Streaming

7 ACUTA Reaches Out to Local Schools

8 Check It out


Local Buckling Behavior Of Round Steel Tubes Subjected To Compressive Loads, Joseph Moore, Ben Fell Aug 2014

Local Buckling Behavior Of Round Steel Tubes Subjected To Compressive Loads, Joseph Moore, Ben Fell

STAR (STEM Teacher and Researcher) Presentations

This project will investigate the local buckling induced fracture behavior of round steel tubes subjected to axial compressive loads, representative of observed failures in buried pipelines during seismic events. Nine initial tests will be conducted across three lengths of round steel tube: 8”, 12”, and 20”. Another twelve tests will be conducted on the lengths of 12” and 20” to test varying initial compressive force upon the round steel tubes. Three D/t ratios will be considered for each length of round steel tube: 52.6, 78.9, and 121.2. To verify the material properties of the test specimens ...