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2004

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Articles 121 - 150 of 173

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

Empirical Evidence Of Diminishing Payoff From Successive Generations Of Information Systems, Gerald E. Evans, Neil Morton Jan 2004

Empirical Evidence Of Diminishing Payoff From Successive Generations Of Information Systems, Gerald E. Evans, Neil Morton

Journal of International Technology and Information Management

Previous research has focused on a number of important variables that can influence the observed payoffs from information systems investments. In the current investigation conducted in the spring of 2002, personal, on-site interviews were conducted in 138 small and medium sized businesses. Vendor involvement in systems development was less related to systems cost than previously. Unfortunately, vendor involvement was unrelated to any of the four measures of systems success in the entire sample. Further analysis revealed a strong relationship between information system generation and payoffs. Specifically, there appeared to be a point of diminishing return with subsequent generations of information …

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Online Reverse Auctions: An Overview, Ching-Chung Kuo, Pamela Rogers, Richard E. White Jan 2004

Online Reverse Auctions: An Overview, Ching-Chung Kuo, Pamela Rogers, Richard E. White

Journal of International Technology and Information Management

Electronic commerce (e-commerce) is the fastest growing area in the U.S. economy with electronic procurement (e-procurement) being a major component, and online reverse auctions (ORAs) have emerged as a key e-procurement tool. Since the mid-1990s, ORAs have been gaining in popularity because of their potentially significant positive impact on the profitability of both the buyers and the sellers. Much has been written about the new purchasing paradigm and numerous stories have been reported recently. This paper is aimed at providing a critical review of ORAs by examining their historical developments, different forms, advantages, and disadvantages. In addition, 10 important factors …

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The Frequency Distribution Of Quantization Error In Digitizers For Coherent Sampling, Sol Neeman Ph.D. Jan 2004

The Frequency Distribution Of Quantization Error In Digitizers For Coherent Sampling, Sol Neeman Ph.D.

Engineering Studies Faculty Publications and Creative Works

In this paper the frequency distribution of quantization error in coherent sampling of digitizers will be investigated. As the distribution of the quantization error affects the values of THD and SNR, it is relevant for a correct interpretation of THD and SNR of sine waves in coherent sampling. The distribution of the quantization error will be analyzed as a function of N, total number of samples and M, number of cycles in the sample set and it will be proved that for certain cases, the quantization error falls on odd harmonics only of the frequency of the sampled sine wave.

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General Creep-Fatigue Life Prediction Models, J. Toland, Tarun Goswami Jan 2004

General Creep-Fatigue Life Prediction Models, J. Toland, Tarun Goswami

Biomedical, Industrial & Human Factors Engineering Faculty Publications

This paper presents a data bank that was compiled from published and unpublished sources. Using these data, low cycle fatigue curves were generated under a range of test conditions showing the effect of test parameters on the Coffin-Manson behavior of steel alloys. Generic equations have been developed in this paper to predict the creep-fatigue life of high temperature materials. Several new multivariate equations were developed to predict the creep-fatigue life of following alloy groups; I) Cr-Mo steels, 2) stainless steels and 3) generic materials involving the materials from the following alloy groups, solder, copper, steels, titanium, tantalum, and nickel based …

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Implementation Of Lean Method And Value Analysis In The Sandblasting Production Shop At Intersign Corporation, Elbert Zeth Nassey Jan 2004

Implementation Of Lean Method And Value Analysis In The Sandblasting Production Shop At Intersign Corporation, Elbert Zeth Nassey

Masters Theses and Doctoral Dissertations

Intersign Corporation is a small signage manufacturing company in Chattanooga, Tennessee, which employs fewer than one hundred workers. The company produces variety of signage products and customized applications including room signs, room IDs, signs, suite IDs, nameplates, safety signs, menus, activity boards, traffic control signs, and many more. One of the company's main products, and the main subject in this study, is sandblasting products. Sandblasting production is a job shop operation which is placed in a 55 x 100 ft building (building B). In the near future, the company will expand this production by moving several workstations into the new …

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Applications Of Simulation In Semiconductor Manufacturing Facilities, Amr Arisha, Paul Young Jan 2004

Applications Of Simulation In Semiconductor Manufacturing Facilities, Amr Arisha, Paul Young

Conference papers

Semiconductor fabrication facilities face many challenges through the many phases of their life cycle including design, build, various production ramps, and many levels of production. Confronted with global competition and rapidly changing technology and customer requirements, there is an increasing demand for rapid solution techniques to improve efficiency in manufacturing. The complexities and forces of both market and the process combine to make the use of simulation crucial at many different planning and control levels. While not a panacea for sustainable performance, simulation provides an effective vehicle for defining the path from competitive concepts to real world solutions and gives …

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Matrix Isolation Infrared Spectroscopic And Theoretical Study Of The Interaction Of Water With Dimethyl Methylphosphonate, Bruce S. Ault, Alex Balboa, David Tevault, Margaret Hurley Jan 2004

Matrix Isolation Infrared Spectroscopic And Theoretical Study Of The Interaction Of Water With Dimethyl Methylphosphonate, Bruce S. Ault, Alex Balboa, David Tevault, Margaret Hurley

United States Army: Publications

Matrix isolation infrared spectroscopy has been combined with theoretical calculations for the characterization of the 1:1 hydrogen-bonded complex between H2O and dimethyl methylphosphonate (DMMP). The symmetric O-H stretching mode was observed to shift 203 cm-1 to lower energy upon hydrogen bond formation, while a 32 cm-1 blue shift was noted for the H-O-H bending mode of the H2O subunit in the complex. These values compare extremely well with the (unscaled) shifts of -203 and +32 cm-1, respectively, that were calculated theoretically at the MP2/6-31+G** level. Additional perturbed modes of the DMMP subunit …

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Adaptive Critic Neural Network-Based Object Grasping Control Using A Three-Finger Gripper, Gustavo Galan, Jagannathan Sarangapani Jan 2004

Adaptive Critic Neural Network-Based Object Grasping Control Using A Three-Finger Gripper, Gustavo Galan, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

Grasping of objects has been a challenging task for robots. The complex grasping task can be defined as object contact control and manipulation subtasks. In this paper, object contact control subtask is defined as the ability to follow a trajectory accurately by the fingers of a gripper. The object manipulation subtask is defined in terms of maintaining a predefined applied force by the fingers on the object. A sophisticated controller is necessary since the process of grasping an object without a priori knowledge of the object's size, texture, softness, gripper, and contact dynamics is rather difficult. Moreover, the object has …

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Adaptive Force-Balancing Control Of Mems Gyroscope With Actuator Limits, Mohammed Hameed, Jagannathan Sarangapani Jan 2004

Adaptive Force-Balancing Control Of Mems Gyroscope With Actuator Limits, Mohammed Hameed, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

This work presents an adaptive force-balancing control (AFBC) scheme with actuator limits for a MEMS Z-axis gyroscope. The purpose of the adaptive force-balancing control is to identify major fabrication imperfections so that they are properly compensated unlike the case of conventional force-balancing controlled gyroscope. The proposed AFBC scheme controls the vibratory modes of the proof mass while ensuring that the control input satisfies the magnitude constraints and the performance of the gyroscope is enhanced in the presence of fabrication uncertainties. Consequently, commonly reported problems of MEMS gyroscope such as quadrature compensation, drive and sense axes frequency tuning are not needed …

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Decentralized Neural Network Control Of A Class Of Large-Scale Systems With Unknown Interconnection, Wenxin Liu, Jagannathan Sarangapani, Donald C. Wunsch, Mariesa Crow Jan 2004

Decentralized Neural Network Control Of A Class Of Large-Scale Systems With Unknown Interconnection, Wenxin Liu, Jagannathan Sarangapani, Donald C. Wunsch, Mariesa Crow

Electrical and Computer Engineering Faculty Research & Creative Works

A novel decentralized neural network (DNN) controller is proposed for a class of large-scale nonlinear systems with unknown interconnections. The objective is to design a DNN for a class of large-scale systems which do not satisfy the matching condition requirement. The NNs are used to approximate the unknown subsystem dynamics and the interconnections. The DNN is designed using the back stepping methodology with only local signals for feedback. All of the signals in the closed loop (system states and weights estimation errors) are guaranteed to be uniformly ultimately bounded and eventually converge to a compact set.

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A Distributed Power Control Mac Protocol For Wireless Ad-Hoc Networks., Maciej Jan Zawodniok, Jagannathan Sarangapani Jan 2004

A Distributed Power Control Mac Protocol For Wireless Ad-Hoc Networks., Maciej Jan Zawodniok, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

A novel distributed power control (DPC)⋅ scheme and a MAC protocol for wireless ad hoc networks in the presence of radio channel uncertainties such as path loss, Shadowing and Rayleigh fading is presented. The DPC quickly estimates the time-varying nature of the channel and uses the information to select a suitable transmitter power value in order to maintain a target Signal-to-Interference ratio (SIR) at the receiver. The standard assumption of a constant interference during a link's power update used in other works is relaxed. The performance of the proposed DPC is demonstrated analytically. The power used for all RTS-CTS-DATA-ACK frames …

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Discrete-Time Neural Network Output Feedback Control Of Nonlinear Systems In Non-Strict Feedback Form, Pingan He, Jagannathan Sarangapani Jan 2004

Discrete-Time Neural Network Output Feedback Control Of Nonlinear Systems In Non-Strict Feedback Form, Pingan He, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

An adaptive neural network (NN)-based output feedback controller is proposed to deliver a desired tracking performance for a class of discrete-time nonlinear systems, which is represented in non-strict feedback form. The NN backstepping approach is utilized to design the adaptive output feedback controller consisting of: 1) a NN observer to estimate the system states with the input-output data, and 2) two NNs to generate the virtual and actual control inputs, respectively. The non-causal problem in the discrete-time backstepping design is avoided by using the universal NN approximator. The persistence excitation (PE) condition is relaxed both in the NN observer and …

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Neural Network Controller For Manipulation Of Micro-Scale Objects, Vijayakumar Janardhan, Pingan He, Jagannathan Sarangapani Jan 2004

Neural Network Controller For Manipulation Of Micro-Scale Objects, Vijayakumar Janardhan, Pingan He, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

A novel reinforcement learning-based neural network (RLNN) controller is presented for the manipulation and handling of micro-scale objects in a microelectromechanical system (MEMS). In MEMS, adhesive, surface tension, friction and van der Waals forces are dominant. Moreover, these forces are typically unknown. The RLNN controller consists of an action NN for compensating the unkoown system dynamics, and a critic NN to tune the weights of the action NN. Using the Lyapunov approach, the uniformly ultimate houndedness (UUB) of the closed-loop tracking error and weight estimates are shown by using a novel weight updates. Simulation results are presented to substantiate the …

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Investigation Of Nascar Restrictor Plate Manifold Insert Using Wave Engine Simulation And Response Surface Methodology, John Mason Gross Iii Jan 2004

Investigation Of Nascar Restrictor Plate Manifold Insert Using Wave Engine Simulation And Response Surface Methodology, John Mason Gross Iii

Electronic Theses and Dissertations

With the increasing growth in computer processing power, computer based computational fluid dynamics simulations are finding increasing acceptance and use in the field of internal combustion engine development. Once fully developed, such simulations provide detailed and expedient tools for testing existing theories, as well as new ideas. While numerous studies on wave propagation and fluid flow in intakes manifolds exist, most restrict the analysis to a single intake runner and port, examining only the dynamics from the runner-to-plenum junction downstream to the valve. While such analyses provide comprehensive models for wave propagation dynamics in the runner, little is published on …

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Optimal Test Case Selection For Multi-Component Software System, Praveen Babu Kysetti Jan 2004

Optimal Test Case Selection For Multi-Component Software System, Praveen Babu Kysetti

LSU Master's Theses

The omnipresence of software has forced upon the industry to produce efficient software in a short time. These requirements can be met by code reusability and software testing. Code reusability is achieved by developing software as components/modules rather than a single block. Software coding teams are becoming large to satiate the need of massive requirements. Large teams could work easily if software is developed in a modular fashion. It would be pointless to have software that would crash often. Testing makes the software more reliable. Modularity and reliability is the need of the day. Testing is usually carried out using …

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Effects Of Pressure Suit And Race On Functional Reach, Static And Dynamic Strength, Nageswara Rao Uppu Jan 2004

Effects Of Pressure Suit And Race On Functional Reach, Static And Dynamic Strength, Nageswara Rao Uppu

LSU Master's Theses

In the design of any manual workspace, it is important for the designers to have access to data that can illustrate reach capabilities under real-time work situation. Wearing bulky clothing (pressure suit) and protective restraints (seat or shoulder harness belts) is often mandatory in high acceleration work environments. Clothing and personal equipment worn can influence the functional reach and strength values since they add to the body size. The present study was conducted to investigate the effect of wearing a VKK-6M pressure suit on functional reach limitations and strength values. The technology of incorporating body dimensions into cockpit design primarily …

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Bezier Curves For Metamodeling Of Simulation Output, Harish J. Kingre Jan 2004

Bezier Curves For Metamodeling Of Simulation Output, Harish J. Kingre

LSU Master's Theses

Many design optimization problems rely on simulation models to obtain feasible solutions. Even with substantial improvement in the computational capability of computers, the enormous cost of computation needed for simulation makes it impractical to rely on simulation models. The use of metamodels or surrogate approximations in place of actual simulation models makes analysis realistic by reducing computational burden. There are many popular metamodeling techniques such as Polynomial Regression, Multivariate Adaptive Regression Splines, Radial Basis Functions, Kriging and Artificial Neural Networks. This research proposes a new metamodeling technique that uses Bezier curves and patches. The Bezier curve method is based on …

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Route Planning Of Automated Guided Vehicles For Container Logistics, Sanjay Shankarrao Gurav Jan 2004

Route Planning Of Automated Guided Vehicles For Container Logistics, Sanjay Shankarrao Gurav

LSU Master's Theses

Automated guided vehicles (AGVs) are widely used in container terminals for the movement of material from shipping to the yard area and vice versa. Research in this area is directed toward the development of a path layout design and routing algorithms for container movement. The problem is to design a path layout and a routing algorithm that will route the AGVs along the bi-directional path so that the distance traveled will be minimized. This thesis presents a bi-directional path flow layout and a routing algorithm that guarantee conflict-free, shortest time routes for AGVs. Based on the path layout, a routing …

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Probabilistic Risk Assessment Method For Prioritization Of Risk Factors, Jay Tarakkumar Shah Jan 2004

Probabilistic Risk Assessment Method For Prioritization Of Risk Factors, Jay Tarakkumar Shah

LSU Master's Theses

Risk management involves assessing the risk sources and designing strategies and procedures to mitigate those risks to an acceptable level. Measurement of risk factors plays an important role in the assessment of risk. This research proposes to develop risk assessment frameworks and mathematical model (Probabilistic Risk Assessment model) identify the risk factors. Quantification and prioritization of risk factors will help to design controls, resource allocation policies and minimize the total cost using the Cost Minimization model. The proposed models are applied to a complex system that is representative of actual business situations.

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Joint Optimization Of Process Improvement Investments For Supplier-Buyer Cooperative Commerce, Erick Comeaux Jan 2004

Joint Optimization Of Process Improvement Investments For Supplier-Buyer Cooperative Commerce, Erick Comeaux

LSU Master's Theses

This research focuses on supporting the formation of strategic alliances through the concept of cooperative commerce, where suppliers and buyers work together to jointly optimize their businesses. The general goal of this research is to examine existing cooperative commerce models for obstacles that would hinder their successful implementation into modern industrial applications and to address those shortcomings. Total annual cost equations are formulated to capture the joint total relevant cost of cooperative commerce business relationships. These total joint relevant cost models will include terms that capture the ordering cost, holding cost, and cost of quality, as well as any applicable …

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Effects Of Automobile Seating Posture On Trunk Muscle Activity, Milton Maada-Gormoh Saidu Jan 2004

Effects Of Automobile Seating Posture On Trunk Muscle Activity, Milton Maada-Gormoh Saidu

LSU Master's Theses

Reports for adult population indicate that almost 80% of the adult population has reported some form of lower back aches. Each year American workers suffer more than 300,000 lost-time injuries involving musculoskeletal disorders of the back, with the costs that run into billions of dollars. Sedentary tasks are known to be major contributing factors of back pain. Prior studies have indicated that the myoelectric activity of the lumbar region decreases when the back rest inclination of a seat increased. An increase in seat pan inclination so that it increases pressure on the leg muscles is also a cause for back …

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Discerning Attributes Which Stimulate Performance In Quality Improvement Teams, Dwan Lamar Prude Jan 2004

Discerning Attributes Which Stimulate Performance In Quality Improvement Teams, Dwan Lamar Prude

Masters Theses

"Total quality management (TQM) can be summed up as people and the way they work. One key element of the philosophies of TQM is the heavy emphasis on utilizing quality improvement teams (QITs) and quality tools to effectively create high performance organizations. Specifically, this investigation asks the following questions: 1) What are the key attributes that contribute to performance in QITs? 2) What is the relationship between team communication and QIT performance? 3) What is the relationship between the number of quality tools utilized in a team and QIT performance? Participants for this study were 101 students from the University …

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Development Of An Expert Judgement Elicitation And Calibration Methodology For Risk Analysis In Conceptual Vehicle Design, Resit Unal, Charles Keating, Bruce Conway, Trina Chytka Jan 2004

Development Of An Expert Judgement Elicitation And Calibration Methodology For Risk Analysis In Conceptual Vehicle Design, Resit Unal, Charles Keating, Bruce Conway, Trina Chytka

Engineering Management & Systems Engineering Faculty Publications

A comprehensive expert-judgment elicitation methodology to quantify input parameter uncertainty and analysis tool uncertainty in a conceptual launch vehicle design analysis has been developed. The ten-phase methodology seeks to obtain expert judgment opinion for quantifying uncertainties as a probability distribution so that multidisciplinary risk analysis studies can be performed. The calibration and aggregation techniques presented as part of the methodology are aimed at improving individual expert estimates, and provide an approach to aggregate multiple expert judgments into a single probability distribution. The purpose of this report is to document the methodology development and its validation through application to a reference …

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Enhancing Instruction In Lean Manufacturing Through Development Of Simulation Activities In Shipbuilding Operations, Alok K. Verma, James Hughes, Scott Christman Jan 2004

Enhancing Instruction In Lean Manufacturing Through Development Of Simulation Activities In Shipbuilding Operations, Alok K. Verma, James Hughes, Scott Christman

Engineering Technology Faculty Publications

Lean Manufacturing is a powerful philosophy that advocates minimization of waste within an organization. The adoption of Lean Manufacturing philosophy by major manufacturers has created a demand for qualified personnel in this area. A training program in Lean Enterprise was developed by Old Dominion University for the Apprentice School at Northrop Grumman Newport News. Physical simulation activities are an integral part of this training program. Simulation activities related to shipbuilding operations have been incorporated in the Lean training course. These activities have been used in the Business Operations course for three semesters. Results show increased student participation and better understanding …

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Design, Development, And Delivery Of Certificate Programs For Funding Opportunities And Industry Collaboration, Carol Considine, Paul Kauffmann Jan 2004

Design, Development, And Delivery Of Certificate Programs For Funding Opportunities And Industry Collaboration, Carol Considine, Paul Kauffmann

Engineering Technology Faculty Publications

Many engineering technology departments have four general areas that are used for evaluation of tenure and promotion. These areas include teaching, research and scholarly activities, service, and other professional activities. Although teaching is the primary mission in most engineering technology programs, external funding as part of the research area is playing a larger role in tenure decisions at many universities. Many faculty members in engineering technology programs come from an industrial background and do not have a specific research area of interest and contacts within the research community. These faculty members must look at other avenues to develop the external …

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Lean Product Development Flow, Bohdan W. Oppenheim Jan 2004

Lean Product Development Flow, Bohdan W. Oppenheim

Systems Engineering Faculty Works

A general holistic framework, also called a process—named “Lean Product Development Flow (LPDF)”—for organizing the engineering work of Product Development (PD), has been proposed as a contribution to the emerging field of Lean Systems Engineering. The framework is based on Lean Principles, with emphasis on PD value-pulling workflow pulsed by takt periods. The value is defined as (1) mission assurance/product quality, (the traditional goals of Systems Engineering) and (2) reduced program cost and schedule achieved by a radical reduction of waste. LPDF is recommended for smaller design programs based on a high degree of legacy knowledge, with technologies mature enough …

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Building Data Warehouses Using The Enterprise Modeling Framework, Joseph O. Chan Jan 2004

Building Data Warehouses Using The Enterprise Modeling Framework, Joseph O. Chan

Journal of International Technology and Information Management

This paper proposes an enterprise modeling framework for the deployment of data warehouses. The framework provides the information roadmap coordinating source data and different data warehouses across the business enterprise. The paper introduces a solution to address data warehousing issues at the enterprise level while avoiding the pitfalls of creating enterprise data warehouses and universal data marts. It further proposes a change of paradigm from point solutions focus to a methodology driven by enterprise requirements to meet the challenges of the new economy. The proposed framework emphasizes the separation of the conceptual construct from the physical and operational constructs of …

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The Ecology Of Interorganizational Information Sharing, Jane Fedorowicz, Janis L. Gogan, Amy W. Ray Jan 2004

The Ecology Of Interorganizational Information Sharing, Jane Fedorowicz, Janis L. Gogan, Amy W. Ray

Journal of International Technology and Information Management

Increasingly, companies use interorganizational information systems to support business process partnerships, such as automatic replenishment systems and other supply chain initiatives, invoicing and payments, and insurance claims processing. Inter-firm networking in turn can increase the visibility of information generated and used by business partners. These business partners may experience intended and unintended impacts from the changes in the partnering relationship, in effect altering the ecology of the organization. Yet IT researchers rarely study an organization’s ecology, focusing instead on impacts upon internal processes. Our goal in this paper is to propose a definition of interorganizational information ecology, to provide IT …

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Web-Services – The Next Evolutionary Stage Of E-Business, Santosh S. Venkatraman Jan 2004

Web-Services – The Next Evolutionary Stage Of E-Business, Santosh S. Venkatraman

Journal of International Technology and Information Management

Web-Services are a set of new technologies that promise to take “service-oriented” distributed computing to a whole new level, and eventually take e-business to the next evolutionary stage. Web-Services, in a nutshell, let organizations bridge communication gaps among their information systems, and build new software applications by “stitching” together existing ones. It is capable of integrating applications written in different programming languages, developed by different vendors, and running on different servers with dissimilar operating systems. Web- Services would enable companies to seamlessly connect their information systems and business processes with those of their partners and customers – thus ushering in …

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Customer Relationship Management (Crm): A Comparative Study Between U.S.A. And Spain, Jesus Garcia De Madariaga Jan 2004

Customer Relationship Management (Crm): A Comparative Study Between U.S.A. And Spain, Jesus Garcia De Madariaga

Journal of International Technology and Information Management

This paper surveys the marketing executives of the top companies in Spain with more than 100 million euros on net sales and reports the status of Customer Relationship Management (CRM) solutions in their companies. The results are compared with the U.S.A. status reported by a previous study developed by InformationWeek Research in 2000 with a sample based on Fortune 500. One hundred and thirty-six companies participated in this study. The data provides insights into the strengths and weaknesses of the CRM in Spain in comparison with USA. Some viable actions are recommended to improve the usage of CRM and to …

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