Engineering Commons^™

Applications Of Artificial Neural Networks In Interactive Simulation, Payman Jula

Masters Theses

Although there have been many improvements in simulation technology over the past few years, it still suffers from many limitations. Simulation methods are usually time consuming and hence not suitable for the interactive decision making processes.

In this project, applications of Artificial Neural Networks (ANNs) to simulate manufacturing systems have been studied. The backpropagation Multiple Layer Perceptrons (MLPs) have been applied to simulate manufacturing systems. Some guidelines for developing appropriate ANNs have been presented. The results of ANN approach have been compared to those of conventional simulation methods.

Acuta Enews July 1996, Vol. 25, No. 7

ACUTA Newsletters

In This Issue

New Board of Directors Prepares for 1996-97

ACUTA Announces Quarterly Journal

President's Message

Do You Tax Student Long Distance Bills?

DC at a Glance

University of Washington Fills Service Niche with T1 Channel Banks

How to Subscribe to ACUTA Listserves

Everyone Wants Voice Mail

Campus New Briefs

Welcome New Members

Industry Insights

Exploring Knowledge Processes For Technology Assimilation, Rochelle K. Young

Engineering Management & Systems Engineering Theses & Dissertations

In the emerging knowledge society, the ability to make the experience and expertise of those involved in and affected by new technology unconditionally available to all members of an organization is becoming increasingly important. One of the problems in developing such knowledge processes for technology assimilation is that current social structures do not easily accommodate unconditional participation. Since the implementation of modern information technology is changing the workplace and the nature of work itself, alternative social structures are needed. This research takes as given that deep questions concerning knowledge processes and social transformation are in principle undecidable; and, only questions …

The Noaa Corps -- A Participant Action Research Of A Uniformed Service Facing Termination, Richard Eugene Marriner Ii

Engineering Management & Systems Engineering Theses & Dissertations

The NOAA Corps is a uniformed service of the Federal Government. It is composed of officers commissioned by the President of the United States as are the officers of the Air Force, Army, Coast Guard, Marines, Navy, and Public Health Service. "NOAA" is the acronym for the National Oceanic and Atmospheric Administration, an agency within the U.S. Department of Commerce.

On January 24, 1996 the Clinton administration formally proposed that the NOAA Corps be terminated on October 1, 1996. If this were to become reality it would be the first time in U.S. History that a uniformed service has been …

Reaction Based Grasp Force Assignment, Mark W. Hunter

Theses and Dissertations

An iterative method is developed by which the contact forces required to apply an arbitrary wrench (six elements of force and moment) to a stably grasped object may be calculated quickly. The assignment of contact forces, given a required object wrench, is accomplished with the use of fuzzy logic. This concept is referred to as the fuzzy logic reactive system (FLRS). The solution is versatile with respect to goals inherent in the rulebase and the input parameters, and is also applicable for an arbitrary number of contacts. The goal presented in this research, to illustrate the concept of the FLRS, …

An Artificial Life Model Of Engineering Attrition Contemplation: Why Do Federally Employed Civilian Engineers Think Of Quitting?, John William Herweg

Engineering Management & Systems Engineering Theses & Dissertations

The research objective is, using engineer turnover, to develop an Artificial Life (A-Life) model and simulation methodology useful for studying behavioral variables of individuals in an organization.

One consequence of work stress is burnout, and its extreme expression is quitting or turnover. Various models have been used to explain and predict this behavior. Behavior models are useful tools to explore the ability of organizational policies to reduce stress levels and turnover. Advancing the usefulness of models is a goal which assists all research on human behavior. A-Life offers a new and different methodology for this purpose. It provides an ability …

Applying Informal Cooperative Learning Groups Techniques In The Classroom, Susan L. Murray

Engineering Management and Systems Engineering Faculty Research & Creative Works

The application of informal cooperative learning (CL) groups techniques in the courses including operation research, and computer simulation, is discussed. The informal CL activities can be accomplished in small groups consisting of two or three students. It increases student participation and revitalizing passive lecturers. Students work example problems or homework problems in groups.

Acuta Enews June 1996, Vol. 25, No. 6

ACUTA Newsletters

In This Issue

From the President

Virtual LAN at Univ. of Mississippi

DC at a Glance

Internet Phone

From ACUTA Headquarters

Acuta Enews May 1996, Vol. 25, No. 5

ACUTA Newsletters

In This Issue

From the President

DC at a Glance

Letter to FCC

High-Tech Crime

From ACUTA Headquarters

Developing An Expert System For Processing Planning, Mahmoud M Abdel Wahab

Archived Theses and Dissertations

No abstract provided.

Implementation Of An Integrated Cost And Schedule Control System In The Egyptian Construction Industry, Nahla Mofid El-Ebiary

Archived Theses and Dissertations

No abstract provided.

A New Grouping Measure For Evaluation Of Machine-Component Matrices, Hamid Seifoddini, Manocher Djassemi

Industrial Technology and Packaging

The machine-component matrix is the main input to most machine-component grouping models used in cellular manufacturing. A number of measures have been developed for performance evaluation of machine-component grouping algorithms. In this paper, the relationship between these measures and the performance of the corresponding cellular manufacturing system is evaluated and a new grouping measure is developed which is more consistent in predicting the suitability of a manufacturing system for cellular manufacturing.

Acuta Enews April 1996, Vol. 25, No. 4

ACUTA Newsletters

In This Issue

From the President

Pasadena Community College

Port by Every Pillow at WCU

Multi-Media at Sewanee

DC at a Glance

From ACUTA Headquarters

An Investigation Of Learning Curves And Their Use In Simulation, Jennie H. Lommel

Theses and Dissertations

In 1995, the C-17 Factory Simulation Model (FSM) was developed to enable analysts to address 'what-if' questions about the resources required to build future aircraft, and is based on learning curve models that are used to both portray and simulate future aircraft production. In this thesis, we examine and develop alternate learning curve models that also utilize a small amount of initial production data to portray the relationship between the number of aircraft built and the resources required to build them. The goal is to identify a model which not only provides a good fit and forecast based on a …

Dynamic Lot Sizing And Scheduling In A Multi-Item Production System, Padmanabhan Soundar

Engineering Management & Systems Engineering Theses & Dissertations

In this research, algorithms are developed to address the problem of dynamic lot sizing and scheduling in a single level (or single operation) production system. This research deviates from previous research in this area in that it does not have the kind of assumptions regarding the real world production system that normally were made to reduce the complexity of the problem. Specifically, this research explicitly considers finite capacity, multiple items, known deterministic dynamic demand, sequence dependent setup times and setup costs, setup carryover and variable backlogging. The objective is to simultaneously determine the lot size and the sequence of production …

Developing Methods To Measure And Project Levels Of Combat Readiness In A Naval Aviation Squadron At The Unit Level, Michael Lawrence White

Engineering Management & Systems Engineering Theses & Dissertations

Among the various missions and levels in a military organization, the term "Combat Readiness" is defined in many ways. To a unit-level command, such as an aircraft squadron, it simply refers to the unit's capability to perform its assigned mission when called upon. The proof of that capability is evident in the aftermath of combat, however, it is too late at that point to address any shortcomings that may exist. The problem is, how can the unit effectively define, continuously measure, and confidently forecast its ability to perform in combat? A quantitative model based upon historical data that encompasses all …

A Total Systems Analysis Method For The Conceptual Design Of Spacecraft: An Application To Remote Sensing Imager Systems, Knut I. Oxnevad

Engineering Management & Systems Engineering Theses & Dissertations

Increased emphasis is being placed on improving the performance of space projects, within tighter budgets and shorter development times. This has led to a need for more efficient space system design methods. The research described here represents an effort to develop and evaluate such a method.

Systems engineering and concurrent engineering together provide the theoretical foundation for the method. The method, derived from both this theoretical foundation and ideas from experts in the space industry, emphasizes a total systems analysis approach, taking into account given mission requirements, and the mathematical modeling of interactions between system variables and between subsystems. The …

Acuta Enews March 1996, Vol. 25, No. 3

ACUTA Newsletters

In This Issue

From the President

Seeking a Wireless Solution

DC at a Glance

Telecom & Leg/Reg Listserves

From ACUTA Headquarters

International Space Station Traffic Modeling And Simulation, Jillene B. Rylaarsdam

Theses and Dissertations

In an effort to provide NASA with an alternative perspective and some insights to the operational planning of the International Space Station (ISS), this research developed a simulation environment for the ISS and devised a method to evaluate various altitude strategies. The simulation environment allowed us to incorporate the natural random behaviors which affect the lifetime of objects in low earth orbit. We created prototype models of the operational planning process to analyze current altitude strategy approaches and acquire new strategies from insights observed. In addition, by extrapolating random future solar activity values from the interpolation of historical data, we …

Modeling Space In The Air Force Command Exercise System (Aces), Robert Payne Jr.

Theses and Dissertations

In response to the increased influence of space forces on today's battlefield, several theater level models were analyzed for the presentation of space forces. These models were the Extended Air Defense Simulation (EADSIM), the Joint Theater Level Simulation (JTLS), the Integrated Theater Engagement Model (ITEM), the Tactical Warfare Model (TACWAR), Thunder, Janus, and the Aggregate Level Simulation Protocol (ALSP). While ALSP is not a model but a simulation protocol connecting various models, it was studied because it appears to be the future of modeling. The consensus of the analysis was that space forces are virtually ignored by most of the …

The Effects Of Changing Force Structure On Thunder Output, Michael R. Farmer

Theses and Dissertations

In today's reduction of America's national defense, campaign level models are being used more in the development of force structure. The effects of drawdown are of significant interest to those at the highest levels of authority. Campaign models can bring those high ranking officials the answers they seek with high confidence. THUNDER is a campaign model used frequently by the United States Air Force and many of its contractors. The effects of changing the force structure within THUNDER require modifying variables before executing a new experimental run. Changes in such issues as force structure cannot be immediately addressed. Response Surface …

Replicative Use Of An External Model In Simulation Variance Reduction, Thomas H. Irish

Theses and Dissertations

The use of control variates is a well-known variance reduction technique for discrete event simulation experiments. Currently, internal control variates are used almost exclusively by practitioners and researchers when using control variates. The primary objective of this study is to explore the variance reduction achieved by the replicative use of an external, analytical model to generate control variates. Performance for the analytical control variates is compared to the performance of typical internal and external control variates for both an open and a closed queueing network. Performance measures used are confidence interval width reduction, realized coverage, and estimated Mean Square Error. …

Measuring The Impact Of Programmed Depot Maintenance Funding Shortfalls On Weapon System Availability, Donald F. Hurry

Theses and Dissertations

This study used the Poisson regression technique, bootstrap estimates, and the Kaplan-Meier estimates for survivor curves to determine the impact of Programmed Depot Maintenance (PDM) on weapon system availability. More specifically, these techniques estimated the effect in the number failures per year due to PDM, but the bootstrap technique also estimated the effect in the amount of downtime experienced by a weapon system due to PDM. Although the Poisson regression model did not pass the rigors of statistical testing, the Poisson regression suggested differences in the number of failures per year between PDM and no-PDM weapon systems. The results of …

Procedures For Testing Deterministic Scheduling Models: A Dakota Case Study, Keith H. Mccready

Theses and Dissertations

The DAKOTA scheduling system has been proposed for use in the United States Air Forces Europe's (USAFE's) Operational Support Airlift (OSA) scheduling. This thesis examines the OSA scheduling topic and reviews the relevant literature on vehicle routing, concluding that exact methods are intractable for large problem sizes. Consequently, heuristic methods must be considered. This thesis takes a detailed look at the DAKOTA heuristic. It examines the concepts of Validation, Verification and Accreditation (VV&A), particularly as they apply to heuristics and algorithms. It then defines what measures of performance may prove useful in judging heuristics and algorithms in general, and details …

An Investigation Of Preliminary Feature Screening Using Signal-To-Noise Ratios, David B. Sumrell

Theses and Dissertations

A new saliency metric and a new saliency screening method are developed. This new metric, the SN saliency metric, is based upon signal-to-noise ratios, where the signal is provided by a sum of squared weights associated with a given feature, and the noise is based upon a sum of squared weights associated with a reference noise feature which is injected into the data. The resultant metric allows for a direct comparison of the feature of interest with a reference noise feature which is known to be nonsalient. The SN saliency screening method, which uses the SN saliency metric, offers the …

Surveillance Plan For Monitoring The Shelf-Life Of Chemical Defense Coveralls, Robert E. Neher Jr.

Theses and Dissertations

This thesis found a surveillance plan to be used to monitor the shelf-life of the Air Force's chemical defense coveralls. The sampling tests are destructive and the objective was to find a surveillance plan that would minimize the number of suits sampled yet provide enough information to accurately determine if the chemical defense coveralls had degraded past a minimum acceptable level. Six sampling plans were developed and analyzed. The sampling plans included the Air Force's original fixed sampling plan, several variations of sequential sampling plans, a Bayesian sampling plan, and an ad hoc pre-posturing plan. Each of the sampling plans …

Statistical Process Control In Medical Surveillance. An Application Using Spirometry, Paul W. Mcaree

Theses and Dissertations

This research effort concentrated on applying statistical process control techniques to the results of seven years worth of spirometry exams of workers at Wright-Patterson AFB in helping the occupational health squadron identify potential work hazard areas. Each spirometry exam was classified as abnormal or normal based on a comparison with established normals or a significant loss of function from the previous year's exam for the individual. Each test was classified into the work area of the individual and the number of abnormalities per population of the work area was examined.

Modeling Mobility Engineering In A Theater Level Combat Model, Brian K. Hobson

Theses and Dissertations

This thesis describes the development of a methodology to model theater-level mobility engineering assets in the Joint Staff's Joint Warfare Analysis Experimental Prototype (JWAEP) and to quantify the joint and Army doctrine that guides the task organization of engineers for combat and which quantifies engineer mobility effects in combat. The methodology incorporates theater-level mobility engineering assets into the JWAEP by using Mission, Enemy, Troops available, Terrain, and Time (MET-T principles which reflect joint and Army doctrine, and combines them with the existing basic concepts in other theater-level models. Additional aspects of the problem include determining the manmade and natural obstacles' …

Development Of A Decision Support System For The Department Of Energy's Selection Of Waste Site Remediation Technologies, Brian E. Ralston

Theses and Dissertations

The Department of Energy is faced with the complex decision of selecting technologies for waste site remediation. This research focused on developing a decision support system to aid the decision maker in selecting the best strategy of remediation technologies. A decision analysis model was developed which incorporates life cycle cost data, risk information, and user input, to analyze the technology choices. The research outlined the use of multiple attribute utility theory using exponential attribute utility functions with a simple additive objective function. The best available data was used to demonstrate the capabilities of the model. The model provides the decision …

Applying Response Surface Methodology To Readiness-Based Leveling Of Reparable Items, Todd E. May

Theses and Dissertations

Reparable items play a large role in determining the readiness of United States Air Force weapon systems. Many factors characterizing flying tempo and item repair and transit time influence the level of fleet readiness. Readiness-Based Leveling (RBL) considers these factors as it seeks to maximize aircraft readiness as it allocates spare reparable items between bases and a depot. The purpose of this research was to demonstrate the validity of using response surface methodology (RSM) within the context of RBL in an effort to quantify the influences these factors have on aircraft readiness. RSM applied designed experiments and least squares regressions …