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Articles 1 - 30 of 47
Full-Text Articles in Engineering
The Determination Of Failure Occurring In The Stator Coil Winding Due To The Over-Voltage Using Matlab Software, Ali Reza Alavizadeh
The Determination Of Failure Occurring In The Stator Coil Winding Due To The Over-Voltage Using Matlab Software, Ali Reza Alavizadeh
Morehead State Theses and Dissertations
A thesis presented to the faculty of the College of Science & Technology at Morehead State University in partial fulfillment of the requirements for the degree of Master of Science in Vocational Education & Technology by Ali Reza Alavizadeh on December 1, 2000.
Deformation And Limit Strain Analysis Of Superplastic Materials Using Finite Elements, Noha Mohamed Hassan
Deformation And Limit Strain Analysis Of Superplastic Materials Using Finite Elements, Noha Mohamed Hassan
Archived Theses and Dissertations
No abstract provided.
Estimating Budget Relationships With A Leontief Input-Output Model, Guenever L. R. Shariff
Estimating Budget Relationships With A Leontief Input-Output Model, Guenever L. R. Shariff
Theses and Dissertations
Forty years ago, the Office of the Secretary of Defense proposed using the Leontief input-output model to assess tradeoffs in the Department of Defense's (DoD) budget. We demonstrate that the Leontief input-output model can assess tradeoffs in the Air Force's budget. To increase one part of the Air Force's budget, we need to know the interrelationships between that budget area and the other areas. In this research, we look at different methods of how the functional areas might interact. We demonstrate our methodology on two data sets - DoD and the Air Force aggregate budget data. By looking at how …
Computer-Based Methods For Constructing Two-Level Fractional-Factorial Experimental Designs With A Requirement Set, Steven L. Forsythe
Computer-Based Methods For Constructing Two-Level Fractional-Factorial Experimental Designs With A Requirement Set, Steven L. Forsythe
Theses and Dissertations
This dissertation developed four methodologies for computer-aided experimental design of two-level fractional factorial designs with requirement sets (DOE/RS). The requirement sets identify all the experimental factors and the appropriate interaction terms to be evaluated in the experiment. Taguchi graphs and similar manual methods provide techniques for solving the DOE/RS problem. Unfortunately, these methods are limited because they become difficult to use as the number of factors or interaction terms exceeds ten. This research showed that the DOE/RS problem belongs to a class of difficult-to-solve problems known as NP-Complete. It is the combinatorial nature of NP-Complete problems that causes them to …
Covalidation Of Dissimilarly Structured Models, Samuel A. Wright
Covalidation Of Dissimilarly Structured Models, Samuel A. Wright
Theses and Dissertations
A methodology is presented which allows comparison between models constructed under different modeling paradigms. Consider the following situation: Two models are constructed to study different aspects of the same system. One model simulates a fleet of aircraft moving a given combination of cargo and passengers from an onload point to an offload point. A second model is a linear programming model that optimizes the aircraft and route selection required for the same scenario. We develop a methodology to structure the comparison between large-scale models such as these. Models that compare favorably using this methodology are deemed covalid. Models that perform …
An Analysis Of The Influence Of Age And Ionizing Radiation On Cognitive Performance, Elizabeth L. Gerhardt
An Analysis Of The Influence Of Age And Ionizing Radiation On Cognitive Performance, Elizabeth L. Gerhardt
Master's Theses - Daytona Beach
This thesis was designed to study whether age has a significant effect on cognitive test results among persons exposed to ionizing radiation. The data for this investigation came from the fourth year of a 1995-98 longitudinal study of subjects exposed to radiation from the 1986 Chernobyl, Ukraine, nuclear power plant accident. Accuracy and efficiency scores from four cognitive tests taken by 84 Ukrainian volunteers were divided into two age groups and three radiation dosage groups for analysis. The results of this study found that decrements in human performance on tasks involving spatial processing increase with age in persons who have …
Identification Of Risks In Construction Contracts, Hala Mohamed Fouad Afify
Identification Of Risks In Construction Contracts, Hala Mohamed Fouad Afify
Archived Theses and Dissertations
No abstract provided.
The Development Of A Fmea Process For Design And Maintenance, Tearesa Lynn Wegscheid
The Development Of A Fmea Process For Design And Maintenance, Tearesa Lynn Wegscheid
Masters Theses
Failure Modes and Effects Analysis (FMEA) is a systematic way to identify and evaluate potential product and process related failure modes, the associated causes of failures, and the necessary actions to eliminate or reduce the chance of the failure. There are a number of published manuals and books on FMEA. The materials provide a definition of the FMEA form and examples of the Design and Process FMEA. However, there are many inconsistencies throughout the literature. As a result, FMEA is not always value-added.
The thesis is twofold. First, it documents a case study that uses Design FMEA extensively. The case …
Swarm Engineering, S. Kazadi '90
Swarm Engineering, S. Kazadi '90
Doctoral Dissertations
Swarm engineering is the natural evolution of the use of swarm-based techniques in the accomplishment of high level tasks using a number of simple robots. In this approach, one seeks not to generate a class of behaviors designed to accomplish a given global goal, as is the approach typically found in mainstream robotics. Once the class of behaviors has been understood and decided upon, specific behaviors designed to accomplish this goal may be generated that will complete the desired task without any concern about whether or not the final goal will actually be completed. As long as the generated behaviors …
Development And Integration Of A Decision Support System For Electronic Outsourcing Into Telemanufacturing Service Provider, Vikram Batra
Development And Integration Of A Decision Support System For Electronic Outsourcing Into Telemanufacturing Service Provider, Vikram Batra
Theses
The use of computers and Information Technology enables manufacturers, especially small and medium size enterprises (SMEs) to improve productivity and increase manufactuning flexibility. Telemanufactuning or manufacturing in virtual environment is one of the infrastructures that facilitate the use of information superhighways and computer technology to attain these goals. Broadly defined, Telemanufactuning is the utilization of services accessed via communication networks and across information superhighways to perform in real time, operations and processes essential to the design and production of items. It can be a key enabler for decentralized manufacturing using global resources and expert design teams. In addition to updating …
An Information System To Guide New Small Businesses In Egypt, Hisham Nabil Roshdy
An Information System To Guide New Small Businesses In Egypt, Hisham Nabil Roshdy
Archived Theses and Dissertations
No abstract provided.
Supply Chain Performance, Dina Wafaa Hegazy
Supply Chain Performance, Dina Wafaa Hegazy
Archived Theses and Dissertations
No abstract provided.
Target Monitoring And Assessment System, Tarek Mostafa Abdel
Target Monitoring And Assessment System, Tarek Mostafa Abdel
Archived Theses and Dissertations
No abstract provided.
Customized Medical Modeling, Seif Allah Mohamed El Sayed
Customized Medical Modeling, Seif Allah Mohamed El Sayed
Archived Theses and Dissertations
No abstract provided.
An Integrated Engineering-Computation Framework For Collaborative Engineering: An Application In Project Management, Hisham Mohamed El-Sayed Abdelsalam
An Integrated Engineering-Computation Framework For Collaborative Engineering: An Application In Project Management, Hisham Mohamed El-Sayed Abdelsalam
Mechanical & Aerospace Engineering Theses & Dissertations
Today's engineering applications suffer from a severe integration problem. Engineering, the entire process, consists of a myriad of individual, often complex, tasks. Most computer tools support particular tasks in engineering, but the output of one tool is different from the others'. Thus, the users must re-enter the relevant information in the format required by another tool. Moreover, usually in the development process of a new product/process, several teams of engineers with different backgrounds/responsibilities are involved, for example mechanical engineers, cost estimators, manufacturing engineers, quality engineers, and project manager. Engineers need a tool(s) to share technical and managerial information and to …
A Systems-Based Methodology For The Construction And Representation Of Organizational Knowledge Systems, Willie James Mcfadden
A Systems-Based Methodology For The Construction And Representation Of Organizational Knowledge Systems, Willie James Mcfadden
Engineering Management & Systems Engineering Theses & Dissertations
The purpose of this research was to develop and apply a systems-based, analysis methodology which constructs and represents an organization's knowledge system. The research inquiry was guided by four questions: (1) “what is an organizational knowledge system?” (2) “how can it be made explicit?” (3) “does the representation accurately depict the organization's perspective of their unique knowledge system?” and (4) “what results from the deployment of the organizational knowledge system methodology?” The resultant answers to these research questions advanced and established the theoretical conception of an organization's knowledge system through the development of a methodology that fosters the construction and …
Feature Selection For Predicting Pilot Mental Workload, Julia A. East
Feature Selection For Predicting Pilot Mental Workload, Julia A. East
Theses and Dissertations
Advances in technology have the cockpits of the aircraft in the Air Force inventory increasingly complex. Consequently, mental demands on the pilot have risen. In some cases, mental demands were so overwhelming that pilots have forgotten basic flying techniques, such as G-straining maneuvers. The results have been fatal. Recent research in this area has involved collecting psychophysiological features, such as electroencephalography (EEG), heart, eye and respiration measures, in an attempt to identify pilot mental workload. This thesis focuses on feature selection and reduction of the psycophysiological features and subsequent classification of pilot mental workload on multiple subjects over multiple days. …
Multi-Objective Evaluation Of Target Sets In A Logistics Network, Paul D. Emslie
Multi-Objective Evaluation Of Target Sets In A Logistics Network, Paul D. Emslie
Theses and Dissertations
This thesis addresses the selection of target sets to disrupt an adversary's logistics network in a wartime environment. In the presence of many objectives--such as reducing maximum flow, lengthening routes, avoiding collateral damage, all at minimal risk to our pilots--the problem of determining the best target set is complex. Previous efforts have not adequately considered the value of the remaining network functionality after target destruction. In addition, current network targeting procedures optimize target sets with respect to only a single metric. This thesis uses a multi-objective decision analysis framework capturing actual targeting decision-maker values and preferences to evaluate and analyze …
A Combined Inventory And Delivery Model For Repairable Items, Bahtiyar Eren
A Combined Inventory And Delivery Model For Repairable Items, Bahtiyar Eren
Theses and Dissertations
Traditionally, logistics analysts have treated the delivery problem separate from the inventory and repair problems. In other words, each of these three problems-delivery, inventory, and repair-are treated individually. We combine the vehicle routing problems and inventory allocation problems in a single formulation. Furthermore, lateral re-supply is considered, in that supplies are not only available from the main depot, but also from other bases. After we get the lateral re-supply information, we set a delivery allocation plan out of the main depot. Such allocations are then delivered via vehicles stationed at the main depot. There is a repair capability for each …
Global Positioning System (Gps) Error Source Prediction, Marcus G. Ferguson
Global Positioning System (Gps) Error Source Prediction, Marcus G. Ferguson
Theses and Dissertations
With the initiation of the navigation accuracy prediction algorithm used to estimate the amount of GPS solution (location and time) error for receivers, the capability to accurately predict solution errors due to the major GPS error sources is growing. Although some sources of error within the GPS solution have been previously analyzed, modeled, and/or accounted for within various modeling efforts, a formal evaluation of the seven major error sources that distort GPS activity has not been officially conducted up until this point. This research offers a logical assessment of all the major GPS error sources and their definitive impact on …
A Java Universal Vehicle Router In Support Of Routing Unmanned Aerial Vehicles, Robert W. Harder
A Java Universal Vehicle Router In Support Of Routing Unmanned Aerial Vehicles, Robert W. Harder
Theses and Dissertations
Unmanned Aerial Vehicles (UAVs) help the military gather information in times of peace and war. During a mission, typically 100 sites or more, a UAV will frequently be re-tasked to visit a pop-up threat, leaving the operator to determine the best way to finish the day's list of sites after the re-tasking. I develop a prototype application to serve the needs of a specific customer, the 11th Reconnaissance Squadron, by helping them preplan missions and dynamically re-task UAVs. This prototype application is built on a reusable airframe router called the core AFIT Router, which can later be added to more …
Modelling Information Assurance: A Value Focused Thinking Approach, Jonathan Todd Hamill
Modelling Information Assurance: A Value Focused Thinking Approach, Jonathan Todd Hamill
Theses and Dissertations
The information revolution has brought forth new and improved capabilities to rapidly disseminate and employ information in decision-making. These capabilities are critical to the civilian and military infrastructures of the United States, and act as force enhancers and enablers for the Armed Forces. These capabilities, however, often rely upon systems interconnected throughout the world, resulting in potentially increased vulnerability to attack. To add to this problem, elusive, threatening forces (national and transnational) originating from anywhere on the globe are likely to offer opponents less reliant on information technology an asymmetric advantage over information-reliant nations like the United States. To date, …
Toward Validating Vertical Aggregation In Object Oriented Simulation, George W. Johnson Jr.
Toward Validating Vertical Aggregation In Object Oriented Simulation, George W. Johnson Jr.
Theses and Dissertations
Recent interest in studying the nonlinear effects of intelligence, surveillance, and reconnaissance in combat models has prompted researchers to employ vertical aggregation in object-oriented simulations. Traditional horizontal aggregation falls short for its inability to provide accurate means for nonlinear functions. Averaging a group of objects that exhibit nonlinear behavior provides a linear approximation to the mean, which is not necessarily the expected value of the underlying nonlinear function. Vertical aggregation explicitly models individual objects, thus preserving their nonlinear behaviors. In this research, a validation procedure is derived to study the aptness of vertical aggregation methods. Validation is carried out by …
A Hybrid Jump Search And Tabu Search Metaheuristic For The Unmanned Aerial Vehicle (Uav) Routing Problem, Gary W. Kinney Jr.
A Hybrid Jump Search And Tabu Search Metaheuristic For The Unmanned Aerial Vehicle (Uav) Routing Problem, Gary W. Kinney Jr.
Theses and Dissertations
In this research, we provide a new meta-heuristic, a jump search I tabu search hybrid, for addressing the vehicle routing problem with real-life constraints. A tour construction heuristic creates candidate solutions or jump points for the problem. A tabu search algorithm uses these jump points as starting points for a guided local search. We provide statistical analysis on the performance of our algorithm and compare it to other published algorithms. Our algorithm provides solutions within 10% of the best known solutions to benchmark problems and does so in a fraction of the time required by competing algorithms. The timeliness of …
Using Simulation To Model An Army Recruiting Station With Seasonality Effects, David C. Longhorn
Using Simulation To Model An Army Recruiting Station With Seasonality Effects, David C. Longhorn
Theses and Dissertations
One of the toughest jobs in the Army is that of the recruiter. Recruiters are tasked with the awesome job of convincing young men and women to lay down their lives and freedoms for their country, and oftentimes for less money than can be earned in the safer environment of America's booming economy. Recruiters face enormous pressure from commanders to meet the mandated Army manning levels set each year by Congress. As the Army begins the 21st century, it is faced with having to support an increasing number of deployments with fewer soldiers. Soldiers face long and difficult days with …
A Validation Assessment Of The Storm Air-To-Air Prototype Algorithm, David M. Pugh
A Validation Assessment Of The Storm Air-To-Air Prototype Algorithm, David M. Pugh
Theses and Dissertations
A validation assessment of the new STORM air-to-air prototype algorithm is accomplished using structural and output validation techniques. In the structural validation phase, the algorithms, code, and assumptions are evaluated to determine if the implementation of the model will match the intent of the designers. The components of the algorithm are compared to its predecessor, THUNDER, to evaluate if the prototype nnproves upon the weaknesses of THUNDER. In the output validation phase, the results of the model are evaluated to determine the extent to which the implementation of the model matches expected outcomes. Sensitivity analysis is presented to provide insight …
Leontief Metamodeling For Military Strategic Effects, Anthony W. Snodgrass
Leontief Metamodeling For Military Strategic Effects, Anthony W. Snodgrass
Theses and Dissertations
In this research, we propose and demonstrate an approach to incorporate currently un-modeled interactions into an existing or a new combat model or simulation. We apply the Leontief Input-Output model, which is a macro-economic model that measures the interactions between major industrial sectors of an economy, as a metamodel that periodically assesses the status of various combat units and support functions. If needed resources are insufficient, appropriate degrades are input into the combat model. As a result, dependencies that are not in the combat model are incorporated. Hence, we can assess the strategic or cascading effects of destroying a set …
A Greedy Multiple-Knapsack Heuristic For Solving Air Mobility Command’S Intratheater Airlift Problem, Nicholas J. Zeisler
A Greedy Multiple-Knapsack Heuristic For Solving Air Mobility Command’S Intratheater Airlift Problem, Nicholas J. Zeisler
Theses and Dissertations
This research develops a methodology using a greedy heuristic to solve Air Mobility Command's intratheater airlift scenario as a multiple knapsack problem. The objective is to maximize throughput in a theater given a vehicle mixture and assignment scheme. The model allows for a heterogeneous, user defined vehicle mix in a theater consisting of up to five bed down locations and up to seven forward operating locations. First, we preprocess routes, eliminating the large number of unattractive route choices in the problem. Then using a greedy heuristic, we select routes and assign them to aircraft located at any or all of …
The Evaluation Of Competing Classifiers, Stephen G. Alsing
The Evaluation Of Competing Classifiers, Stephen G. Alsing
Theses and Dissertations
This dissertation research makes contributions towards the objective evaluation of competing classifiers, i.e., classification systems (CSs) or pattern recognition algorithms. Automatic CSs have been under development for almost 40 years in a wide range of military and medical applications. During this period, scientists and engineers have developed extensive theory and algorithms for classification, but by comparison have focused little on the testing and evaluation of their systems. Classifier evaluation is very important in the fields of automatic target recognition (ATR) and pilot workload classification. In order for military operators to be confident in new CSs, they must have an objective …
The Distributor’S Three-Dimensional Pallet-Packing Problem: A Mathematical Formulation And Heuristic Solution Approach, Brian P. Ballew
The Distributor’S Three-Dimensional Pallet-Packing Problem: A Mathematical Formulation And Heuristic Solution Approach, Brian P. Ballew
Theses and Dissertations
It is through practice and experience Air Force loadmasters are able to pack the Air Force standard HCU-6/E (463L) pallets efficiently. Although the loadmasters perform their jobs exceptionally well, the Air Force is in search of a model that will more efficiently pack the pallets. We have developed a mathematical formulation of the three-dimensional pallet-packing problem which minimizes the amount of unused space on a pallet. The formulation ensures each box is packed with the correct volume and dimensions, and ensures the volume of all the boxes packed is less than the available pallet volume. Additionally, the formulation ensures that …