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Operations Research, Systems Engineering and Industrial Engineering Commons

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Iowa State University

2014

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Articles 1 - 30 of 46

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

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 ...


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.


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 ...


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 ...


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 ...


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 ...


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 ...


Life Cycle Assessment Of The Production Of Hydrogen And Transportation Fuels From Corn Stover Via Fast Pyrolysis, Yanan Zhang, Guiping Hu, Robert C. Brown Jul 2014

Life Cycle Assessment Of The Production Of Hydrogen And Transportation Fuels From Corn Stover Via Fast Pyrolysis, Yanan Zhang, Guiping Hu, Robert C. Brown

Industrial and Manufacturing Systems Engineering Publications

This life cycle assessment (LCA) evaluates and quantifies the environmental impacts of the production of hydrogen and transportation fuels from the fast pyrolysis and upgrading of corn stover. Input data for this analysis come from Aspen Plus modeling, a GREET model database and a U.S Life Cycle Inventory Database. SimaPro 7.3 software is employed to estimate the environmental impacts. The results indicate that the net fossil energy input is 0.25 MJ and 0.23 MJ per km traveled for a light-duty vehicle fueled by gasoline and diesel fuel, respectively. Bio-oil production requires the largest fossil energy input ...


Situation Aftermath Management System And Method: Patent Application, Michael C. Dorneich, Chris Hamblin, William Rogers, Stephen Whitlow Jun 2014

Situation Aftermath Management System And Method: Patent Application, Michael C. Dorneich, Chris Hamblin, William Rogers, Stephen Whitlow

Industrial and Manufacturing Systems Engineering Patents

A system and method for assisting flight crew recovery in the aftermath of an unexpected event is provided. A processor is used to detect that an unexpected event has occurred in an aircraft and, in response to detecting that the unexpected event has occurred, state data are stored in memory. The processor is also used to detect that the expected event has been resolved and, in response to detecting that the unexpected event has been resolved, the processor retrieves the state data from the memory, generates an aftermath plan that includes prompts to guide the flight crew to complete the ...


The Design Problem Framework: Using Adaption-Innovation Theory To Construct Design Problem Statements, Eli M. Silk, Shanna R. Daly, Kathryn Jablokow, Seda Yilmaz, Meisha N. Berg Jun 2014

The Design Problem Framework: Using Adaption-Innovation Theory To Construct Design Problem Statements, Eli M. Silk, Shanna R. Daly, Kathryn Jablokow, Seda Yilmaz, Meisha N. Berg

Industrial Design Conference Presentations, Posters and Proceedings

Using Adaption-Innovation Theory to Build a Framework for Constructing Design Problem StatementsDesign problems are central to the work of practicing engineers and thus the education ofengineering students. As engineering instructors work to improve student design skills, oneoverlooked aspect could be in the way they frame and present design problems in their courses.Word choices, decisions about relevant information to include, and stated goals within thesedesign problem statements are likely to impact students’ approaches to generating solutions, aswell as the design solutions themselves.In our work, we developed a framework to assist in the development and framing of designproblem statements to ...


Taxonomy Of Teams, Team Tasks, And Tutors, Desmond Bonner, Stephen B. Gilbert, Michael C. Dorneich, Shawn Burke, Jamiahus Walton, Colin Ray, Eliot H. Winer Jun 2014

Taxonomy Of Teams, Team Tasks, And Tutors, Desmond Bonner, Stephen B. Gilbert, Michael C. Dorneich, Shawn Burke, Jamiahus Walton, Colin Ray, Eliot H. Winer

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

While significant research has been done on teams and teaming (Salas, et al. 2004), less work has been done to characterize teams and team tasks in terms of the feasibility for them to benefit from intelligent tutoring. This theoretical paper begins to describe how the parameters of team structures addressed may affect the ways in which a team can accommodate external guidance. In addition, parameters of team tasks and resulting team tutors are also described. Examples of both team structures and team tasks are provided so that the resulting theoretical framework offers guidance for design decisions during the construction of ...


Modality And Timing Of Team Feedback: Implications For Gift, Jamiahus Walton, Michael C. Dorneich, Stephen B. Gilbert, Desmond Bonner, Eliot H. Winer, Colin Ray Jun 2014

Modality And Timing Of Team Feedback: Implications For Gift, Jamiahus Walton, Michael C. Dorneich, Stephen B. Gilbert, Desmond Bonner, Eliot H. Winer, Colin Ray

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

This paper discusses considerations relevant to the design of team feedback in intelligent tutoring systems (ITSs). While team tutoring is a goal for the Generalized Intelligent Framework for Tutoring (GIFT), further research must be done to explore the focus, modalities, and timing of feedback for teams. Alt-hough there have been a number of studies on feedback, there are a limited number of studies on feedback for teams. This theoretical paper leverages previous research on ITSs, training, individual feedback, and teamwork models to inform appropriate decisions about the most effective feedback mechanisms for teams. Finally, the implications of team feedback on ...


Robust Design Of A Closed-Loop Supply Chain Network For Uncertain Carbon Regulations And Random Product Flows, Nan Gao, Sarah M. Ryan Jun 2014

Robust Design Of A Closed-Loop Supply Chain Network For Uncertain Carbon Regulations And Random Product Flows, Nan Gao, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Publications

This paper addresses a multi-period capacitated closed-loop supply chain (CLSC) network design problem subject to uncertainties in the demands and returns as well as the potential carbon emission regulations. Two promising regulatory policy settings are considered: namely, (a) a carbon cap and trade system, or (b) a tax on the amount of carbon emissions. A traditional CLSC network design model using stochastic programming is extended to integrate robust optimization to account for regulations of the carbon emissions caused by transportation. We propose a hybrid model to account for both regulatory policies and derive tractable robust counterparts under box and ellipsoidal ...


Role Of Senior Capstones In 21st Century Technology Undergraduate Programs, Gretchen A. Mosher Jun 2014

Role Of Senior Capstones In 21st Century Technology Undergraduate Programs, Gretchen A. Mosher

Agricultural and Biosystems Engineering Technical Reports and White Papers

To provide a summary of current thoughts and practices on undergraduate capstone courses, this white paper will contain three major portions. Positive student outcomes and potential institutional uses of capstone courses will be discussed in the first portion of the paper. The second part of the paper will discuss the challenges of implementing a high-quality capstone course in a technology-based curriculum program. Specifically, considerations for sourcing student projects, student team formation and management, and fair and consistent assessment of students will be discussed. Implications for technology faculty who wish to embark on the development of a senior-level capstone course will ...


California Statewide Plug-In Electric Vehicle Infrastructure Assessment, Marc Melaina, Michael S. Helwig May 2014

California Statewide Plug-In Electric Vehicle Infrastructure Assessment, Marc Melaina, Michael S. Helwig

Industrial and Manufacturing Systems Engineering Technical Reports and White Papers

The California Statewide Plug-In Electric Vehicle Infrastructure Assessment conveys to interested parties the Energy Commission’s conclusions, recommendations, and intentions with respect to plug-in electric vehicle (PEV) infrastructure development. There are several relatively low-risk and high-priority electric vehicle supply equipment (EVSE) deployment options that will encourage PEV sales and increase electric miles (e-miles) driven by PEVs. These include homes where PEVs exist; workplaces and multiunit dwellings where management has indicated support for PEVs and surveys indicate a high likelihood of use of charging infrastructure; garaged fleets with significant numbers of PEVs; and airports and locations near public transportation, provided certain ...


An Integrated Approach To Information Modeling For The Sustainable Design Of Products, Douglas C. Eddy, Sundar Krishnamurty, Ian R. Grosse, Paul Witherell, Kemper E. Lewis Apr 2014

An Integrated Approach To Information Modeling For The Sustainable Design Of Products, Douglas C. Eddy, Sundar Krishnamurty, Ian R. Grosse, Paul Witherell, Kemper E. Lewis

Center for e-Design Publications

The design of more sustainable products can be best accomplished in a tradeoff-based design process that methodically handles conflicting objectives. Such conflicts are often seen between, environmental impact, cost, and product performance. To support such a process, this paper proposes the development of an environment where sustainability considerations are explicitly introduced early into the design process. This explicitness is provided by integrating the requirements information of sustainability standards and regulations directly into the design process. The emergence of the semantic web provides an interoperable environment in which the context and meaning of knowledge about the relationships among various domains can ...


Display System And Method For Generating A Display, William Rogers, Michael C. Dorneich, Chris Hamblin, Stephen Whitlow Apr 2014

Display System And Method For Generating A Display, William Rogers, Michael C. Dorneich, Chris Hamblin, Stephen Whitlow

Industrial and Manufacturing Systems Engineering Patents

A display system and method for providing a display. A display system includes a computer processor, the computer processor being configured to receive information from a plurality of sensors. The computer processor is further configured to detect an abnormal situation, based on information received from the plurality of sensors. The display system further includes a database including abnormal situation response procedures in operable communication with the processor, wherein the database is configured to provide the processor with the abnormal situation response procedures upon the detection of an abnormal situation. The display system further includes a display device in operable communication ...


Integrated Supply Chain Design For Commodity Chemicals Production Via Woody Biomass Fast Pyrolysis And Upgrading, Yanan Zhang, Guiping Hu, Robert C. Brown Apr 2014

Integrated Supply Chain Design For Commodity Chemicals Production Via Woody Biomass Fast Pyrolysis And Upgrading, Yanan Zhang, Guiping Hu, Robert C. Brown

Industrial and Manufacturing Systems Engineering Publications

This study investigates the optimal supply chain design for commodity chemicals (BTX, etc.) production via woody biomass fast pyrolysis and hydroprocessing pathway. The locations and capacities of distributed preprocessing hubs and integrated biorefinery facilities are optimized with a mixed integer linear programming model. In this integrated supply chain system, decisions on the biomass chipping methods (roadside chipping vs. facility chipping) are also explored. The economic objective of the supply chain model is to maximize the profit for a 20-year chemicals production system. In addition to the economic objective, the model also incorporates an environmental objective of minimizing life cycle greenhouse ...


Potential Competition For Biomass Between Biopower And Biofuel Under Rps And Rfs2, Mohammad Rahdar, Lizhi Wang, Guiping Hu Apr 2014

Potential Competition For Biomass Between Biopower And Biofuel Under Rps And Rfs2, Mohammad Rahdar, Lizhi Wang, Guiping Hu

Industrial and Manufacturing Systems Engineering Publications

Driven by Renewable Portfolio Standards and Renewable Fuel Standard, biopower generation and biofuel production will increasingly compete for the same biomass resource over the next two decades. We use a linear programming model to study this competition as well as other interactions between the two policies. Our model describes the U.S. renewable energy portfolio by explicitly accounting for all major renewable energy resources, unique resource availability and policy requirements in all 50 states and Washington, DC, and policy deadlines set by all RPS and RFS2 policies within a 2013-2035 modeling horizon. Our modeling results were used to address five ...


Multifunctional Avionic Display, Michael C. Dorneich, Patricia Ververs, Jeffrey M. Rye, Stephen G. Mccauley Mar 2014

Multifunctional Avionic Display, Michael C. Dorneich, Patricia Ververs, Jeffrey M. Rye, Stephen G. Mccauley

Industrial and Manufacturing Systems Engineering Patents

The present invention provides a screen as defined in claim 1. The screen may include the features of any one or more of dependent claims 2 to 4.

The present invention also provides a method as defined in claim 5. The method may include the features of claim 6.

The above-mentioned problems of current systems are addressed by embodiments of the present invention and will be understood by reading and studying the following specification.

In one embodiment, a display screen for displaying multiple sets of information is provided. The display screen includes at least one region of a select color ...


A Natural User Interface For Immersive Design Review, Anastacia Macallister, Eliot H. Winer, Siemens Plm Software, The Boeing Company Jan 2014

A Natural User Interface For Immersive Design Review, Anastacia Macallister, Eliot H. Winer, Siemens Plm Software, The Boeing Company

Mechanical Engineering Conference Presentations, Papers, and Proceedings

As markets demand engineered products faster, waiting on the cyclical design processes of the past is not an option. Instead, industry is turning to concurrent design and interdisciplinary teams. When these teams collaborate, engineering CAD tools play a vital role in conceptualizing and validating designs. These tools require significant user investment to master, due to challenging interfaces and an overabundance of features. These challenges often prohibit team members from using these tools for exploring alternatives. This paper presents a method allowing users to interact with a design using intuitive gestures and head tracking, all while keeping the model in a ...


Assessing Regional Farm-To-Institution Food Distribution Systems: An Agent-Based Approach, Caroline C. Krejci, Benita M. Beamon Jan 2014

Assessing Regional Farm-To-Institution Food Distribution Systems: An Agent-Based Approach, Caroline C. Krejci, Benita M. Beamon

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

The long-term sustainability and resilience of the industrial food supply system is threatened by its extremely high rate of resource consumption and its lack of structural complexity. Seeking a safer, healthier, and more sustainable alternative, farmers and consumers are increasingly participating in localized food systems. Scaling up the capacity of localized food supply chains (FSCs) to meet growing consumer demand will require the development of new types of marketing and distribution channels. The farm-to-institution channel, in which farmers sell their products directly to institutional and retail customers, is of particular interest. This paper describes an agent-based approach to modeling and ...


Feasibility Of Automatic Detection Of Surface Cracks In Wind Turbine Blades, Huiyi Zhang, John K. Jackman Jan 2014

Feasibility Of Automatic Detection Of Surface Cracks In Wind Turbine Blades, Huiyi Zhang, John K. Jackman

Industrial and Manufacturing Systems Engineering Publications

Cracks on the surface of a wind turbine blade (WTB) can be a sign of current or future damage to the underlying structure depending on the severity of the cracks. We investigated a new method for automatically detecting surface cracks based on image processing techniques. The method was evaluated by varying crack parameters and our method parameters. Identifying and quantifying cracks as small as hair thickness is possible with this technique. Orientation of a crack did not affect the results. The effects of uneven background illumination (present in images captured on-tower) were significantly reduced by optimizing the threshold value for ...


Techno-Economic Analysis Of Co-Located Corn Grain And Corn Stover Ethanol Plants, Longwen Ou, Tristan Brown, Rajeeva Thilakaratne, Guiping Hu, Robert C. Brown Jan 2014

Techno-Economic Analysis Of Co-Located Corn Grain And Corn Stover Ethanol Plants, Longwen Ou, Tristan Brown, Rajeeva Thilakaratne, Guiping Hu, Robert C. Brown

Industrial and Manufacturing Systems Engineering Publications

The goal of this paper is to evaluate the economic performance of co-located corn grain ethanol (Gen 1) and cellulosic ethanol (Gen 2) facilities. We present six scenarios to evaluate the impact of stover-to-grain mass (SGM) ratios on overall minimum ethanol selling price (MESP). For the Gen 1 plant, MESP is $3.18/ gasoline gallon equivalent (GGE) while for the Gen 2 plant it is $5.64/GGE. Co-located Gen 1 and Gen 2 plants operating at the lowest SGM ratio of 0.4 generates the lowest overall MESP of $3.73/GGE as well as the highest MESP for ...


A Pseudo-Likelihood Analysis For Incomplete Warranty Data With A Time Usage Rate Variable And Production Counts, Yu Qiu, Danial J. Nordman, Stephen B. Vardeman Jan 2014

A Pseudo-Likelihood Analysis For Incomplete Warranty Data With A Time Usage Rate Variable And Production Counts, Yu Qiu, Danial J. Nordman, Stephen B. Vardeman

Industrial and Manufacturing Systems Engineering Publications

The most direct purpose of collecting warranty data is tracking associated costs. However, they are also useful for quantifying a relationship between use rate and product time-to-first-failure and for estimating the distribution of product time-to-first-failure (which is modeled in this article as depending on use rate and a unit potential life length under continuous use). Employing warranty data for such reliability analysis purposes is typically complicated by the fact that some parts of some warranty data records are missing. A pseudo-likelihood methodology is introduced to deal with some kinds of incomplete warranty data (such as that available in a motivating ...


A Tri-Level Model Of Centralized Transmission And Decentralized Generation Expansion Planning For An Electricity Market: Part I, Shan Jin, Sarah M. Ryan Jan 2014

A Tri-Level Model Of Centralized Transmission And Decentralized Generation Expansion Planning For An Electricity Market: Part I, Shan Jin, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Publications

We develop a tri-level model of transmission and generation expansion planning in a deregulated power market environment. Due to long planning/construction lead times and concerns for network reliability, transmission expansion is considered in the top level as a centralized decision. In the second level, multiple decentralized GENCOs make their own capacity expansion decisions while anticipating a wholesale electricity market equilibrium in the third level. The collection of bi-level games in the lower two levels forms an equilibrium problem with equilibrium constraints (EPEC) that can be approached by either the diagonalization method (DM) or a complementarity problem (CP) reformulation. We ...


Characterization Of Information Automation On The Flight Deck, Rachel Dudley, Michael C. Dorneich, Emmanuel Letsu-Dake, William Rogers, Stephen D. Whitlow, Michael Dillard, Erik Nelson Jan 2014

Characterization Of Information Automation On The Flight Deck, Rachel Dudley, Michael C. Dorneich, Emmanuel Letsu-Dake, William Rogers, Stephen D. Whitlow, Michael Dillard, Erik Nelson

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

This paper summarizes the results of analyses to identify characteristics of flight deck information automation systems which can lead to potential human factors issues. Information automation systems are responsible for the collection, processing, analysis, and presentation of information to the flightcrew. Information automation systems can pose human factors issues and challenges particular to this type of automation. This paper presents a formal definition of information automation and identifies characteristics and associated human factors issues in the domain of aircraft flight deck systems. A method was developed to identify a set of consistent and independent characteristics of information automation. Characteristics, a ...


Evaluation Of Designer Feedback Systems In Design For Manufacturability, Prashant Barnawal, Michael C. Dorneich, Frank E. Peters, Matthew C. Frank Jan 2014

Evaluation Of Designer Feedback Systems In Design For Manufacturability, Prashant Barnawal, Michael C. Dorneich, Frank E. Peters, Matthew C. Frank

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

The research study introduces a new designer feedback tool called Three Dimensional Integrated Feedback (3DIF) tool to convey manufacturability analysis results early in the conceptual design phase. The study evaluates and compares different modalities of manufacturability feedback given to de-sign engineers. The conceptual design stage is critical in deter-mining the feasibility of the whole production process. Providing designers with early suggestions and feedback about the manu-facturability of product designs will help to improve their design and save time and cost to manufacture. Feedback given to the design engineers could be in any form text, 2D markups, 3D data or verbal ...


An Ontological Model And Method For Obsolescence Resolution And Management, Liyu Zheng, Janis P. Terpenny, Nihal Orfi Jan 2014

An Ontological Model And Method For Obsolescence Resolution And Management, Liyu Zheng, Janis P. Terpenny, Nihal Orfi

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

With today's rapid advancement in technologies, commercial high tech components are rendered obsolete more frequently. Such components are often parts of long-life products. Hence, technology obsolescence can make design changes for systems expensive and result in high life-cycle costs. Several tools have been developed to support obsolescence management. While these tools provide benefits and serve as focal points for information related to components, these tools are limited in many respects due to data conflicts, incompleteness and inconsistency. Further, the lack of communication between these tools compounds the limitations making the proactive management of obsolescence even more challenging. This paper ...


Parallel Successive Convex Approximation For Nonsmooth Nonconvex Optimization, Mesiam Razaviyayn, Mingyi Hong, Zhi-Quan Luo, Jong-Shi Pang Jan 2014

Parallel Successive Convex Approximation For Nonsmooth Nonconvex Optimization, Mesiam Razaviyayn, Mingyi Hong, Zhi-Quan Luo, Jong-Shi Pang

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

Consider the problem of minimizing the sum of a smooth (possibly non-convex) and a convex (possibly nonsmooth) function involving a large number of variables. A popular approach to solve this problem is the block coordinate descent (BCD) method whereby at each iteration only one variable block is updated while the remaining variables are held fixed. With the recent advances in the developments of the multi-core parallel processing technology, it is desirable to parallelize the BCD method by allowing multiple blocks to be updated simultaneously at each iteration of the algorithm. In this work, we propose an inexact parallel BCD approach ...