Open Access. Powered by Scholars. Published by Universities.®

Operations Research, Systems Engineering and Industrial Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

8,171 Full-Text Articles 9,709 Authors 3,873,057 Downloads 139 Institutions

All Articles in Operations Research, Systems Engineering and Industrial Engineering

Faceted Search

8,171 full-text articles. Page 241 of 243.

Hand-Hold Location And Trunk Kinematics During Box Handling, Omid Haddad, Gary Mirka 2010 Iowa State University

Hand-Hold Location And Trunk Kinematics During Box Handling, Omid Haddad, Gary Mirka

Industrial and Manufacturing Systems Engineering Publications

Trunk kinematics variables have been shown to be related to low back injury risk during lifting tasks and it was hypothesised that changes in hand-hold positions could influence trunk kinematics and thereby risk. Fourteen subjects lifted a 5 or 10 kg box using four different hand placement locations (two symmetric and two asymmetric) while their trunk kinematics (position, velocity and acceleration in the sagittal, coronal and transverse planes) were captured using the lumbar motion monitor (LMM). These kinematics data were then used to calculate the probability of high risk group membership (PHRGM) as defined in the LMM risk assessment model ...


The Effects Of Horizontal Load Speed And Lifting Frequency On Lifting Technique And Biomechanics, Boyi Dai, Sangeun Jin, Xiaopeng Ning, Gary Mirka 2010 Iowa State University

The Effects Of Horizontal Load Speed And Lifting Frequency On Lifting Technique And Biomechanics, Boyi Dai, Sangeun Jin, Xiaopeng Ning, Gary Mirka

Industrial and Manufacturing Systems Engineering Publications

Lifting loads that have a horizontal velocity (e.g. lifting from a conveyor) is often seen in industry and it was hypothesised that the inertial characteristics of these loads may influence lifting technique and low back stress. Seventeen male participants were asked to perform lifting tasks under conditions of four horizontal load speeds (0 m/s, 0.7 m/s, 1.3 m/s and 2.4 m/s) and two lifting frequencies (10 and 20 lifts/min) while trunk motions and trunk muscle activation levels were monitored. Results revealed that increasing horizontal load speed from 0 m/s to ...


Optimization Models And Algorithms For Spatial Scheduling, Christopher J. Garcia 2010 Old Dominion University

Optimization Models And Algorithms For Spatial Scheduling, Christopher J. Garcia

Engineering Management & Systems Engineering Theses & Dissertations

Spatial scheduling problems involve scheduling a set of activities or jobs that each require a certain amount of physical space in order to be carried out. In these problems space is a limited resource, and the job locations, orientations, and start times must be simultaneously determined. As a result, spatial scheduling problems are a particularly difficult class of scheduling problems. These problems are commonly encountered in diverse industries including shipbuilding, aircraft assembly, and supply chain management. Despite its importance, there is a relatively scarce amount of research in the area of spatial scheduling.

In this dissertation, spatial scheduling problems are ...


Smart Maintenance Decision Support Systems (Smdss), Daniel Paul Bumblauskas 2010 Iowa State University

Smart Maintenance Decision Support Systems (Smdss), Daniel Paul Bumblauskas

Graduate Theses and Dissertations

Computerized information systems are used in all contemporary industries and have been applied to track maintenance information and history. To a lesser extent, such information systems have also been used to predict or simulate maintenance decisions and actions. This work details two models, a population data analysis, and a system infrastructure, to aid operations and maintenance managers with the difficult resource allocation decisions they face in the field. The first model addresses the consideration of component dependency for series network connections using a Markov Decision Process model and solution algorithm. The second model addresses the prioritization of maintenance activities for ...


Discovering Patterns In A Survey Of Secondary Injuries Due To Agricultural Assistive Technology, Yanjun Shi 2010 Iowa State University

Discovering Patterns In A Survey Of Secondary Injuries Due To Agricultural Assistive Technology, Yanjun Shi

Graduate Theses and Dissertations

The research is motivated by the need for hazard assessment in agriculture field. A small and highly-imbalanced dataset, in which negative instances heavily outnumber positive instances, is derived from a survey of secondary injuries induced by implementation of agriculture assistive technology which assists farmers with injuries or disabilities to continue farm-related work. Three data mining approaches are applied to the imbalanced dataset in order to discover patterns contributing to secondary injuries.

All of patterns discovered by the three approaches are compared according to three evaluation measurements: support, confidence and lift, and potentially most interesting patterns are found. Compared to graphical ...


A Selective Sampling Method For Imbalanced Data Learning On Support Vector Machines, Jong Myong Choi 2010 Iowa State University

A Selective Sampling Method For Imbalanced Data Learning On Support Vector Machines, Jong Myong Choi

Graduate Theses and Dissertations

The class imbalance problem in classification has been recognized as a significant research problem in recent years and a number of methods have been introduced to improve classification results. Rebalancing class distributions (such as over-sampling or under-sampling of learning datasets) has been popular due to its ease of implementation and relatively good performance. For the Support Vector Machine (SVM) classification algorithm, research efforts have focused on reducing the size of learning sets because of the algorithm's sensitivity to the size of the dataset. In this dissertation, we propose a metaheuristic approach (Genetic Algorithm) for under-sampling of an imbalanced dataset ...


Interlaminate Strength Of Laminated Die Tooling, Jenna Faith Pritchard 2010 Iowa State University

Interlaminate Strength Of Laminated Die Tooling, Jenna Faith Pritchard

Graduate Theses and Dissertations

This thesis examines process planning for rapid die tooling. Sheet metal die tooling typically requires long lead times from design to manufacturing. Rapid manufacturing of die tooling is a method that reduces lead times by minimizing the process planning time. This research focuses on the process planning algorithm for laminated die manufacture to automatically provide adequate interlaminate strength using a minimum number of fasteners.

A mechanical model was developed for predicting shear and compressive forces during sheet metal bending was developed as an input to a bolt and dowel pin algorithm. An algorithm is described for proper placement of bolts ...


Scenario Reduction Heuristics For A Rolling Stochastic Programming Simulation Of Bulk Energy Flows With Uncertain Fuel Costs, Yan Wang 2010 Iowa State University

Scenario Reduction Heuristics For A Rolling Stochastic Programming Simulation Of Bulk Energy Flows With Uncertain Fuel Costs, Yan Wang

Graduate Theses and Dissertations

Stochastic programming is employed regularly to solve energy planning problems with uncertainties in costs, demands and other parameters. We formulated a stochastic program to quantify the impact of uncertain fuel costs in an aggregated U.S. bulk energy transportation network model. A rolling two-stage approach with discrete scenarios is implemented to mimic the decision process as realizations of the uncertain elements become known and forecasts of their values in future periods are updated. Compared to the expected value solution from the deterministic model, the recourse solution found from the stochastic model has higher total cost, lower natural gas consumption and ...


The Impact Of Inspector's Cognitive Style On Performance In Various Visual Inspection Display Tasks, Chen-shuang Wei 2010 Iowa State University

The Impact Of Inspector's Cognitive Style On Performance In Various Visual Inspection Display Tasks, Chen-Shuang Wei

Graduate Theses and Dissertations

Three aspects of visual inspection were considered in this study. Cognitive styles, feedforward training (job aid), and pacing would have effects on inspection performance. In this study, the Matching Familiar Figures Test (MFFT) was administrated and the basic (control), static (self-pacing), and hybrid (systematic pacing) displays were used to investigate the pacing effect. The objectives are not only to classify the inspectors into different categories via the MFFT based on their cognitive styles, but also to investigate inspection performance (accuracy and response time) affected by the job aids as cognitive styles are also concerned. The results indicate that the MFFT ...


Simulation Optimisation Methods In Supply Chain Applications: A Review, Amr Arisha, Waleed Abo-Hamad 2010 Technological University Dublin

Simulation Optimisation Methods In Supply Chain Applications: A Review, Amr Arisha, Waleed Abo-Hamad

Articles

The competitiveness and dynamic nature of today’s marketplace is due to rapid advances in information technology, short product life cycles and the continuing trend in global outsourcing. Managing the resulting supply chain networks effectively is challenged by high levels of uncertainty in supply and demand, confl ict objectives, vagueness of information, numerous decision variables and constraints. With such levels of complexity, supply chain optimisation has the potential to make a signifi cant contribution in resolving these challenges. In this paper, a literature review – based on more than 100 peer-reviewed articles – of state-of-the-art simulation-based optimisation techniques in the context of ...


Practical Simulation Application: Evaluation Of Process Control Parameters In Twisted-Pair Cables Manufacturing System, Amr Mahfouz, Said Hassan, Amr Arisha 2010 Technological University Dublin

Practical Simulation Application: Evaluation Of Process Control Parameters In Twisted-Pair Cables Manufacturing System, Amr Mahfouz, Said Hassan, Amr Arisha

Articles

Intensive competition and rapid technology development of Twisted-Pair Cables (TPC) industry have left no room for competing manufacturers to harbour system inefficiencies. TPC are used in various communication and networks hardware applications; their manufacturing facilities face many challenges including various product configurations with different equipment settings, different product flows and Work in Process (WIP) space limitations. The quest for internal efficiency and external effectiveness forces companies to align their internal settings and resources with external requirements/orders, or in different words, significant factors must be set appropriately and identified prior to manufacturing processes. Integrated definition models (IDEF0, IDEF3) in conjunction ...


Cast Data Matrix Symbols Performance Characterization, Greg Carl Saveraid 2010 Iowa State University

Cast Data Matrix Symbols Performance Characterization, Greg Carl Saveraid

Graduate Theses and Dissertations

Data matrix symbols are used as a robust means of unique part identification in many industries. Research of cast data matrix symbols has been limited and expected symbol performance unknown. To develop knowledge of cast data matrix symbol performance, the investigation initially focused on feasibility of casting data matrix symbol. Results of a feasibility experiment led to further investigation of cast symbol design expected performance.

Bump marks were evaluated initially due to the inherent ease of production and use in previous cast data matrix applications. The results indicate Bump mark geometry is problematic, due to the inherent nature of shadow ...


Supply Chain Models For An Ethanol And Distillers Grains Producer And A Distillers Grains-Based Feed Producer, Shi Peng 2010 Iowa State University

Supply Chain Models For An Ethanol And Distillers Grains Producer And A Distillers Grains-Based Feed Producer, Shi Peng

Graduate Theses and Dissertations

In recent years, there have been substantial interests in the joint production of ethanol and distillers grains (E&DG) from corn. At the same time, there have been corresponding increases in the production of animal feed based on distillers grains (DG). Under such circumstances, ethanol and DG are produced by an E&DG producer, and DG serves as input to feed production by a feed producer.The objective of this paper is to study the strategies of both producers in different models in order to maximize their own profit with more ethanol produced by consuming more DG in the feed ...


Trust, Situation Awareness And Automation Use: Exploring The Effect Of Visual Information Degradations On Human Perception And Performance In Human-Telerobot, Minglu Wang 2010 Iowa State University

Trust, Situation Awareness And Automation Use: Exploring The Effect Of Visual Information Degradations On Human Perception And Performance In Human-Telerobot, Minglu Wang

Graduate Theses and Dissertations

Today's military and industry increasingly uses human-robot system to perform complex tasks, such as firefighting. Automated systems that support or even make important decisions require human operators to understand and trust automation in order to rely on it appropriately. This study used a real human-telerobot system performing a firefighting task in an unknown welding room to examine the effects of two different levels of automation associated with intermittent and permanent visual system degradation on human performance, trust in automation, mental workload and situation awareness. Twenty-four participants were divided into two groups based on the level of automation use. Each ...


An Improved Genetic Algorithm For Knapsack Problems, Taskiran, Gamze Kilincli 2010 Wright State University

An Improved Genetic Algorithm For Knapsack Problems, Taskiran, Gamze Kilincli

Browse all Theses and Dissertations

In this study, an improved genetic algorithm (GA) is presented to solve the multidimensional 0-1 knapsack problem (MKP). The MKP is a well-known combinatorial optimization problem and has received wide attention from the operations research community for decades. Although recent advances in computing and optimization technologies have made the solution of small and medium size instances possible, this NP-hard problem, in general, still remains one of the challenging problems yet to be solved.

Of the various algorithms developed to solve the MKP, GA seems to be one of the best methods pointed out in the literature. A GA is an ...


Use Of Web-Based Lessons Of Statistical Concepts With Graphics And Animation To Enhance The Effectiveness Of Learning, Lavanya Pillala 2010 Wright State University

Use Of Web-Based Lessons Of Statistical Concepts With Graphics And Animation To Enhance The Effectiveness Of Learning, Lavanya Pillala

Browse all Theses and Dissertations

Statistics is of critical importance to engineers. However, many engineering students struggle to grasp the meaning of statistical concepts and the idiosyncrasies of statistical methodologies. Because of this problem, instructors of statistics are constantly searching for better ways to help students understand statistical concepts. The goal of this project is to design and develop web-based lessons that use graphics and animations to enhance the effectiveness of students' learning of statistical concepts.

Lessons of three important statistical concepts have been developed for this thesis - normal distribution, central limit theorem and confidence & tolerance intervals - following well-recognized instructional design development processes and principles ...


Domain-Specific Core Self-Evaluations And Stressors As Predictors Of Strains, Michael Raymond Hoepf 2010 Wright State University

Domain-Specific Core Self-Evaluations And Stressors As Predictors Of Strains, Michael Raymond Hoepf

Browse all Theses and Dissertations

The current study examines the use of a frame-of-reference (FOR) in the evaluation of core self-evaluations, stressors and strains. The study investigates the prediction that using a FOR that matches predictors and outcomes will result in a stronger relationship between the constructs being measured, specifically CSE, stressors, and strains. In addition, the study examines the extent to which following this procedure will add incremental validity after non-contextualized predictors are controlled. The hypotheses in this study were generally supported, although the hypotheses related to the school domain were not supported as strongly as those related to general and work domain. The ...


Impact Of Culture And Age On The Use Of Social Networking Websites, Ramya Reddy Ponnavolu 2010 Wright State University

Impact Of Culture And Age On The Use Of Social Networking Websites, Ramya Reddy Ponnavolu

Browse all Theses and Dissertations

Social networking websites have become very popular amongst people of all ages in recent times. These websites have brought into existence a new form of data - 'User generated content'. Companies everywhere have begun to identify the potential of these sites and have commenced efforts to take advantage of the profitable opportunities available. In spite of all this, it is reasonable to say that the latent possibilities in social networking sites are yet to be fully explored. This is due to the fact that the technology is still young and research on its potential is still ongoing. The current research is ...


Introducing Communication In Dis-Pomdps With Locality Of Interaction, Makoto TASAKI, Yuichi Yabu, Yuki Iwanari, Makoto Yokoo, Janusz Marecki, Pradeep Reddy VARAKANTHAM, Milind Tambe 2010 Kyushu University

Introducing Communication In Dis-Pomdps With Locality Of Interaction, Makoto Tasaki, Yuichi Yabu, Yuki Iwanari, Makoto Yokoo, Janusz Marecki, Pradeep Reddy Varakantham, Milind Tambe

Research Collection School Of Information Systems

The Networked Distributed POMDPs (ND-POMDPs) can model multiagent systems in uncertain domains and has begun to scale-up the number of agents. However, prior work in ND-POMDPs has failed to address communication. Without communication, the size of a local policy at each agent within the ND-POMDPs grows exponentially in the time horizon. To overcome this problem, we extend existing algorithms so that agents periodically communicate their observation and action histories with each other. After communication, agents can start from new synchronized belief state. Thus, we can avoid the exponential growth in the size of local policies at agents. Furthermore, we introduce ...


Demand Price Sensitivity And Market Power In A Congested Fuel And Electricity Network, Sarah M. Ryan 2010 Iowa State University

Demand Price Sensitivity And Market Power In A Congested Fuel And Electricity Network, Sarah M. Ryan

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

IN restructured electricity markets, generating companies submit bids to supply electricity at prices based on their marginal costs, which are driven largely by fuel costs. In each regional wholesale power market, an independent system operator (ISO) manages electricity transmission and sets locational marginal prices (LMPs) to match supplies with demands at each location on the constrained grid. To understand the interaction between constraints on fuel supply and constraints on electricity transmission, we recently developed and tested a game theoretic model that combines both sets of constraints [1][2]. It includes (1) costs of extracting and transporting finite supplies of fuels ...


Digital Commons powered by bepress