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Operations Research, Systems Engineering and Industrial Engineering Commons

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2011

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Articles 121 - 142 of 142

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

An Noc Traffic Compiler For Efficient Fpga Implementation Of Sparse Graph-Oriented Workloads, Nachiket Kapre, André Dehon Jan 2011

An Noc Traffic Compiler For Efficient Fpga Implementation Of Sparse Graph-Oriented Workloads, Nachiket Kapre, André Dehon

Departmental Papers (ESE)

Parallel graph-oriented applications expressed in the Bulk-Synchronous Parallel (BSP) and Token Dataflow compute models generate highly-structured communication workloads from messages propagating along graph edges. We can statially expose this structure to traffic compilers and optimization tools to reshape and reduce traffic for higher performance (or lower area, lower energy, lower cost). Such offline traffic optimization eliminates the need for complex, runtime NoC hardware and enables lightweight, scalable NoCs. We perform load balancing, placement, fanout routing, and fine-grained synchronization to optimize our workloads for large networks up to 2025 parallel elements for BSP model and 25 parallel elements for Token Dataflow ...


Development, Deployment, And Characterization Of A Ku-Band Interferometer, Anthony Swochak Jan 2011

Development, Deployment, And Characterization Of A Ku-Band Interferometer, Anthony Swochak

Masters Theses 1911 - February 2014

Space-borne radar interferometry provides a global vantage point to understand climate change, global weather phenomenon, and other Earth dynamics. For climate change observations, space-borne interferometers can be utilized to relate ocean topography to temperature, thus providing a global map of ocean temperatures. Since the oceans are in constant motion, a single-pass interferometer is needed to successfully make these measurements of ocean height. The feasibility of a single-pass measurement is dependent on the physical size of the instrument, hence it is cheaper and more practical to launch a small, light weight instrument into space. Since instrument size scales inversely with operating ...


Virtual Ed: Utilisation Of A Discrete Event Simulation-Based Framework In Identifying "Real-Time’ Strategies To Improve Patient Experience Times In An Emergency Department, Waleed Abo Hamad, John Mcinerney, Amr Arisha Jan 2011

Virtual Ed: Utilisation Of A Discrete Event Simulation-Based Framework In Identifying "Real-Time’ Strategies To Improve Patient Experience Times In An Emergency Department, Waleed Abo Hamad, John Mcinerney, Amr Arisha

Articles

Objectives and Backgrounds Emergency Department (ED) overcrowding and associated excessive Patient Experience Times (PETs) have proven deleterious impacts on patient mortality, morbidity and overall length of hospital stay. Health systems constantly seek cost-effective organisational strategies to reduce ED crowding and improve patient outcomes, but complex change implementation is constrained by the necessity of maintaining concurrent safe patient-care. Computer modelling in a “virtual reality” has been successfully utilised in industries outside medicine, in providing innovative “real-time” solutions to outdated practices. Therefore a bespoke “Virtual ED” computer model, based on a Discrete Event Simulation (DES) -Based Framework was constructed to determine the ...


Critical Success Factors In The Re-Engineering Of 21st Century Supply Chains, Edward Sweeney Jan 2011

Critical Success Factors In The Re-Engineering Of 21st Century Supply Chains, Edward Sweeney

Practitioner Journals

No abstract provided.


The Effect Of External Distractions On Novice And Experienced Drivers' Anticipation Of Hazards And Vehicle Control, Gautam Divekar Jan 2011

The Effect Of External Distractions On Novice And Experienced Drivers' Anticipation Of Hazards And Vehicle Control, Gautam Divekar

Masters Theses 1911 - February 2014

Out-of-vehicle distractions were identified as contributing factors to about 29.4 % of all crashes that were reported between the years 1995 to 1999 (Stutts J. K., 2005; Stutts J. R., 2001).These crash statistics are from a decade ago. With the increase of cars, pedestrians, shops,vendors, billboards and signs over the last decade it can be safely assumed that the driving environment is more complex now and has greater potential for external driver distraction. Given this, it is important to know the effects of out-of-vehicle distraction on drivers’ ability to drive safely in their presence. With this in mind ...


Emerging M&S Application In Risk Management, C. Ariel Pinto, Andreas Tolk, Michael Mcshane Jan 2011

Emerging M&S Application In Risk Management, C. Ariel Pinto, Andreas Tolk, Michael Mcshane

Engineering Management & Systems Engineering Faculty Publications

There has been compelling signs of the great potential of building further synergy with academics, researchers, and industry practitioners from the areas of Modeling and Simulation (M&S) managing risk events. This paper provides an introduction to risk management and how M&S has permeated the risk management process. The trend has been to harness the advantages of M&S tools and techniques in terms of efficiency and effectiveness in managing risks. However, the more important contribution of M&S may be in how it provides a way for specialists in various disciplines or industries interact to manage risks that ...


Perspectives On Quality Coordination And Assurance In Global Supply Chains, Ling Li, John N. Warfield Jan 2011

Perspectives On Quality Coordination And Assurance In Global Supply Chains, Ling Li, John N. Warfield

Information Technology & Decision Sciences Faculty Publications

The 2007 recall of Berko Electric Toe-Space Heaters made in the US, the recall of backpack blowers made in Japan, the recalls of toys and pet food produced in China have exposed the potential of global supply chain disruptions. This product recall storm leads to the issue of quality assurance in global supply chain management. Product recalls indicate that manufacturing companies are particularly vulnerable to ensure quality when they source via a global supply chain with poor visibility. Obviously, a supply chain cannot afford this kind of sourcing and supply structure that threatens the supply-chain integrity. This special issue on ...


Delayed-Bang Approach Towards More Sustainable Critical Infrastructure Risk Management, C. Ariel Pinto, Michael K. Mcshane, Abhishek S. Pathak Jan 2011

Delayed-Bang Approach Towards More Sustainable Critical Infrastructure Risk Management, C. Ariel Pinto, Michael K. Mcshane, Abhishek S. Pathak

Finance Faculty Publications

This article describes the Delayed Bang Approach for determining the value of risk management alternatives in critical infrastructure security. The discussion includes (1) the need for sustainable risk management (2) the importance of time valuation in evaluating competing loss prevention and loss reduction alternatives, (3) the convergence of deterministic engineering economics, survivability analysis, and probabilistic analysis, and (4) hypothetical examples of the Delayed-Bang Approach and significance towards more sustainable risk management.


Closed-Loop Supply Chain Network Design Under Carbon Emission Regulations, Nan Gao, Sarah M. Ryan Jan 2011

Closed-Loop Supply Chain Network Design Under Carbon Emission Regulations, Nan Gao, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

This paper considers a closed–loop supply chain (CLSC) network design problem that accounts for the impact of carbon emission regulations. Three regulatory policy settings are considered; namely, (a) firms are subject to mandatory carbon caps on the amount of carbon they emit, (b) firms are taxed on the amount of emissions, and (c) firms can participate in a carbon cap and trade system. Traditional CLSC network design models are extended to account for the carbon emissions caused by transportation under different transportation modes. Model validations are demonstrated via a case study. Through detailed sensitivity analysis, we investigate how the ...


A Computational/Experimental Platform For Investigating Three- Dimensional Puzzle Solving Of Comminuted Articular Fractures, Thaddeus P. Thomas, Donald D. Anderson, Andrew Willis, Pengcheng Liu, Matthew C. Frank, J. Lawrence Marsh, Thomas D. Brown Jan 2011

A Computational/Experimental Platform For Investigating Three- Dimensional Puzzle Solving Of Comminuted Articular Fractures, Thaddeus P. Thomas, Donald D. Anderson, Andrew Willis, Pengcheng Liu, Matthew C. Frank, J. Lawrence Marsh, Thomas D. Brown

Industrial and Manufacturing Systems Engineering Publications

Reconstructing highly comminuted articular fractures poses a difficult surgical challenge, akin to solving a complicated three-dimensional (3D) puzzle. Pre-operative planning using CT is critically important, given the desirability of less invasive surgical approaches. The goal of this work is to advance 3D puzzle solving methods toward use as a pre-operative tool for reconstructing these complex fractures. Methodology for generating typical fragmentation/dispersal patterns was developed. Five identical replicas of human distal tibia anatomy, were machined from blocks of high-density polyetherurethane foam (bone fragmentation surrogate), and were fractured using an instrumented drop tower. Pre- and post-fracture geometries were obtained using laser ...


Medial Longitudinal Arch Deformation During Walking And Stair Navigation While Carrying Loads, Elizabeth Rose Hageman, Michelle Hall, Eric Gerard Sterner, Gary A. Mirka Jan 2011

Medial Longitudinal Arch Deformation During Walking And Stair Navigation While Carrying Loads, Elizabeth Rose Hageman, Michelle Hall, Eric Gerard Sterner, Gary A. Mirka

Industrial and Manufacturing Systems Engineering Publications

Background:

Understanding the biomechanics of the medial longitudinal arch (MLA) may provide insights into injury risk and prevention, as well as function of the arch-supporting structures. Our understanding of MLA deformation is currently limited to sit-to-stand, walking, and running.

Material and Methods:

Three-dimensional deformation of the MLA of the right foot was characterized in 17 healthy participants during several simulated activities of daily living. MLA deformation was quantified by both changes in arch length and navicular displacement during the stance phase of three motions: walking, stair ascent, and stair descent. Three levels of load were also evaluated: no load, a ...


Proving Sustainability: The International Development Monitoring Initiative, Evan A. Thomas, Zdenek Zumr Jan 2011

Proving Sustainability: The International Development Monitoring Initiative, Evan A. Thomas, Zdenek Zumr

Mechanical and Materials Engineering Faculty Publications and Presentations

Nearly a billion people in the world lack access to safe drinking water, two billion have inadequate sanitation facilities, three billion use biomass for their daily energy needs and nearly half the world's population live in rural isolation, lacking access to the most basic human services. Combined, these limitations are a leading cause of the perpetuating cycle of poverty and political insecurity. Meanwhile, the majority of international development agencies are responsible for self-reporting project outcomes. At best, expert spot-checks are conducted in the field occasionally. These results tend to show individual project success, while meta- surveys indicate on-going challenges ...


Capacity Expansion In The Integrated Supply Network For An Electricity Market, Shan Jin, Sarah M. Ryan Jan 2011

Capacity Expansion In The Integrated Supply Network For An Electricity Market, Shan Jin, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Publications

Constraints in fuel supply, electricity generation, and transmission interact to affect the welfare of strategic generators and price-sensitive consumers. We consider a mixed integer bilevel programming model in which the leader makes capacity expansion decisions in the fuel transportation, generation, and transmission infrastructure of the electricity supply network to maximize social welfare less investment cost. Based on the leader's expansion decisions, the multiple followers including the fuel suppliers, ISO, and generation companies simultaneously optimize their respective objectives of cost, social welfare, and profit. The bilevel program is formulated as a mathematical program with complementarity constraints. The computational challenge posed ...


The Effect Of Stance Width On Trunk Kinematics And Trunk Kinetics During Sagitally Symmetric Lifting, Christopher Sorenson, Omid Haddad, Samuel Campbell, Gary Mirka Jan 2011

The Effect Of Stance Width On Trunk Kinematics And Trunk Kinetics During Sagitally Symmetric Lifting, Christopher Sorenson, Omid Haddad, Samuel Campbell, Gary Mirka

Industrial and Manufacturing Systems Engineering Publications

Lifting technique can have a significant impact on spine loading during lifting. The sports biomechanics literature has documented changes in trunk and lower extremity kinematics and muscle coactivation patterns as a function of stance width during high force dead lift and squat exercises. The focus of the current study was to explore whether these lifting stance width effects might translate into the occupational setting under more moderate load level conditions. Twelve subjects performed repetitions of a sagittally symmetric lifting and lowering task (10 kg load) under three stance width conditions: narrow (feet together), moderate (feet shoulder width) and wide (feet ...


Influence Of Asymmetry On The Flexion Relaxation Response Of The Low Back Musculature, Xiaopeng Ning, Omid Haddad, Sangeun Jin, Gary Mirka Jan 2011

Influence Of Asymmetry On The Flexion Relaxation Response Of The Low Back Musculature, Xiaopeng Ning, Omid Haddad, Sangeun Jin, Gary Mirka

Industrial and Manufacturing Systems Engineering Publications

Background

The flexion relaxation phenomenon has been extensively studied in sagittally symmetric postures. Knowledge about this phenomenon in asymmetric trunk postures is less well understood, and may help to reveal the underlying physiology of the passive tissue/active tissue load-sharing mechanism in the lumbar region.

Methods

Twelve participants performed fifteen controlled, full range trunk flexion–extension motions toward three asymmetric lifting postures (0° (sagittally symmetric), 15°, and 30° from the mid-sagittal plane). The electromyographic activity data from the paraspinals at the L3 and L4 levels and trunk kinematics data from motion sensors over the C7, T12 and S1 vertebrae were ...


Presentation: Proving Sustainability: The International Development Monitoring Initiative, Evan A. Thomas Jan 2011

Presentation: Proving Sustainability: The International Development Monitoring Initiative, Evan A. Thomas

Mechanical and Materials Engineering Faculty Publications and Presentations

Presentation detailing the activities and products of the Sustainable Water, Energy and Environmental Technologies Laboratory at Portland State University (SWEETLab). The lab also works to develop standards to help evaluate and compare projects and outcomes around the world. Water treatment and sanitation practices, as well as newly designed cookstoves, are highlighted.


Support Of Product Innovation With A Modular Framework For Knowledge Management: A Case Study, Douglas C. Eddy, Sundar Krishnamurty, Ian R. Grosse, Jack C. Wileden Jan 2011

Support Of Product Innovation With A Modular Framework For Knowledge Management: A Case Study, Douglas C. Eddy, Sundar Krishnamurty, Ian R. Grosse, Jack C. Wileden

Center for e-Design Proceedings

This paper presents an e-Design framework for knowledge management through its application in an engineering design case study. The e-Design framework enables the implementation of integrated design information throughout the entire design process. It facilitates the ease of sharing real time information across multiple individual designers, departments, or organizations as would be required in large scale design efforts. Similarly, it allows for the ease of use of technical tools integral to the design process that small design departments depend upon. Thus, regardless of the scale, the efficiency of engineering design can be improved with the use of the e-Design framework ...


Towards Industrial Implementation Of Emerging Semantic Technologies, Jay T. Brindel, Ian R. Grosse, Sundar Krishnamurty, John Altidor, Seth Trachtenberg, Paul Witherell Jan 2011

Towards Industrial Implementation Of Emerging Semantic Technologies, Jay T. Brindel, Ian R. Grosse, Sundar Krishnamurty, John Altidor, Seth Trachtenberg, Paul Witherell

Center for e-Design Proceedings

Every new design, project, or procedure within a company generates a considerable amount of new information and important knowledge. Furthermore, a tremendous amount of legacy knowledge already exists in companies in electronic and non-electronic formats, and techniques are needed for representing, structuring and reusing this knowledge. Many researchers have spent considerable time and effort developing semantic knowledge management systems, which in theory are presumed to address these problems. Despite significant research investments, little has been done to implement these systems within an industrial setting. In this paper we identify five main requirements to the development of an industry-ready application of ...


Purification Of A Recombinant Heavy Chain Fragment C Vaccine Candidate Against Botulinum Serotype C Neurotoxin [Rbontc(HC)] Expressed In Pichia Pastoris, Michael P. Dux, Jicai Huang, Rick Barent, Mehmet Inan, S. Todd Swanson, Jayanta Sinha, John T. Ross, Leonard A. Smith, Theresa J. Smith, Ian Henderson, Michael M. Meagher Jan 2011

Purification Of A Recombinant Heavy Chain Fragment C Vaccine Candidate Against Botulinum Serotype C Neurotoxin [Rbontc(HC)] Expressed In Pichia Pastoris, Michael P. Dux, Jicai Huang, Rick Barent, Mehmet Inan, S. Todd Swanson, Jayanta Sinha, John T. Ross, Leonard A. Smith, Theresa J. Smith, Ian Henderson, Michael M. Meagher

US Army Research

A purification process for the manufacture of a recombinant C-terminus heavy chain fragment from botulinum neurotoxin serotype C [rBoNTC(Hc)], a potential vaccine candidate, has been defined and successfully scaled-up. The rBoNTC(Hc) was produced intracellularly in Pichia pastoris X-33 using a three step fermentation process, i.e., glycerol batch phase, a glycerol fed-batch phase to achieve high cell densities, followed by a methanol induction phase. The rBoNTC(Hc) was captured from the soluble protein fraction of cell lysate using hydrophobic charge induction chromatography (HCIC; MEP HyperCel™), and then further purified using a CM 650M ion exchange ...


Improving Service Through Just-In-Time Concept In A Dynamic Operational Environment, Kar Way Tan, Hoong Chuin Lau, Na Fu Jan 2011

Improving Service Through Just-In-Time Concept In A Dynamic Operational Environment, Kar Way Tan, Hoong Chuin Lau, Na Fu

Research Collection School Of Information Systems

This paper is concerned with the problem of Just-In-Time (JIT) job scheduling in a dynamic environment under uncertainty to attain timely service. We provide an approach, based on robust scheduling concepts, to analytically evaluate the expected cost of earliness and tardiness for each job and also the project. In addition, we search for a schedule execution policy with the minimum robust cost such that for a given risk level (epsilon), the actual realized schedule has (1 - epsilon) probability of completing with less than or equal to this robust cost. Our method is quite generic, and can be applied to JIT ...


Instance-Based Parameter Tuning Via Search Trajectory Similarity Clustering, Linda Lindawati, Hoong Chuin Lau, David Lo Jan 2011

Instance-Based Parameter Tuning Via Search Trajectory Similarity Clustering, Linda Lindawati, Hoong Chuin Lau, David Lo

Research Collection School Of Information Systems

This paper is concerned with automated tuning of parameters in local-search based meta-heuristics. Several generic approaches have been introduced in the literature that returns a ”one-size-fits-all” parameter configuration for all instances. This is unsatisfactory since different instances may require the algorithm to use very different parameter configurations in order to find good solutions. There have been approaches that perform instance-based automated tuning, but they are usually problem-specific. In this paper, we propose CluPaTra, a generic (problem-independent) approach to perform parameter tuning, based on CLUstering instances with similar PAtterns according to their search TRAjectories. We propose representing a search trajectory as ...


Fine-Tuning Algorithm Parameters Using The Design Of Experiments Approach, Aldy Gunawan, Hoong Chuin Lau, Linda Lindawati Jan 2011

Fine-Tuning Algorithm Parameters Using The Design Of Experiments Approach, Aldy Gunawan, Hoong Chuin Lau, Linda Lindawati

Research Collection School Of Information Systems

Optimizing parameter settings is an important task in algorithm design. Several automated parameter tuning procedures/configurators have been proposed in the literature, most of which work effectively when given a good initial range for the parameter values. In the Design of Experiments (DOE), a good initial range is known to lead to an optimum parameter setting. In this paper, we present a framework based on DOE to find a good initial range of parameter values for automated tuning. We use a factorial experiment design to first screen and rank all the parameters thereby allowing us to then focus on the ...