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Full-Text Articles in Engineering
Weapon Release Scheduling From Multiple-Bay Aircraft Using Multi-Objective Evolutionary Algorithms, Francis R. Lyons Iv
Weapon Release Scheduling From Multiple-Bay Aircraft Using Multi-Objective Evolutionary Algorithms, Francis R. Lyons Iv
Theses and Dissertations
The United States Air Force has put an increased emphasis on the timely delivery of precision weapons. Part of this effort has been to us multiple bay aircraft such the B-1B Lancer and B-52 Stratofortress to provide Close Air Support and responsive strikes using 1760 weapons. In order to provide greater flexibility, the aircraft carry heterogeneous payloads which can require deconfliction in order to drop multiple different types of weapons. Current methods of deconfliction and weapon selection are highly crew dependent and work intensive. This research effort investigates the optimization of an algorithm for weapon release which allows the aircraft …
Analysis Of Scheduling Policies For A M/G/I Queue With Rework, Jennifer Hendrixson
Analysis Of Scheduling Policies For A M/G/I Queue With Rework, Jennifer Hendrixson
Theses and Dissertations
This thesis analyzes a multi-class M/G/1 priority queueing system in which distinct job types require one service cycle and, with non-zero probability, require a second service cycle. The main objective is to find a new heuristic scheduling policy that minimizes the long-run expected holding and preemption costs. Arrival rates, service rates, and the probability of undertaking second service are all class specific. A mean value analysis (MVA) approach was employed to derive the long- run mean time in queue for each job type under each policy, thereby providing the appropriate cost equations. Numerical experiments suggest that the preemptive resume scheduling …
Use Of Critical Chain Scheduling To Increase Aircraft Availability, Daniel D. Mattioda
Use Of Critical Chain Scheduling To Increase Aircraft Availability, Daniel D. Mattioda
Theses and Dissertations
This study addresses the operation and support cost differences between the TUAF C-130E & C-130B, and the USAF C-130J aircraft. The TUAF C-130s have been being used for more than 30 years and changing world situations give armed forces different roles, and Turkey participates in all peacekeeping missions that are assigned by NATO (North Atlantic Treaty Organization) and the United Nations. While performing these roles, the importance of air mobility and the importance of reliability became widely appreciated. Moreover, the coming retiring age of the existing C-130s in the TUAF forced the TUAF to look for ways to improve its …
A Comparison Of Consistent Versus Inconsistent Scheduling Rules In A Flow Shop Environment, Nicola Gismondi
A Comparison Of Consistent Versus Inconsistent Scheduling Rules In A Flow Shop Environment, Nicola Gismondi
Theses and Dissertations
A consistent scheduling rule is one which will ensure a job's priority (relative to all other job's) will remain constant as it moves from queue to queue in a production system. Previous research concerning flow shop priority scheduling rules focused on comparison of either consistent or inconsistent rules. Conversely, this study sought to provide additional insight by comprising consistent and inconsistent rules in a flow shop environment The Air Force uses both types of rules in maintenance and logistics scheduling. Time and money can be saved if the scheduling managers can better understand the effect of consistency on a system. …
Dynamic Maintenance Scheduling For A Stochastic Telecommunication Network: Determination Of Performance Factors, Todd S. Patterson
Dynamic Maintenance Scheduling For A Stochastic Telecommunication Network: Determination Of Performance Factors, Todd S. Patterson
Theses and Dissertations
This research proposes an analytical approach to access the relationship between maintenance facility location and communication network performance measurement using a selected dynamic maintenance scheduling protocol. There were three objectives established for this effort. The first objective was the determination of an upper-bound upon the level of performance for a telecommunication network using dynamically scheduled maintenance to evaluate maintenance depot location. This was achieved by using a two-stage algorithm, first locate a maintenance depot by using stochastic algorithms, and then to measure the resulting impact upon performance with a multi-commodity network flow model. The second objective was to develop the …
A Heuristic Approach To Determining Cargo Flow And Scheduling For Air Mobility Command's Channel Cargo System, John Fitzsimmons Jr., John Walker
A Heuristic Approach To Determining Cargo Flow And Scheduling For Air Mobility Command's Channel Cargo System, John Fitzsimmons Jr., John Walker
Theses and Dissertations
This research investigated a heuristic approach to schedule aircraft for the channel cargo system of the Unit States Air Forces Air Mobility Command AMC. Given cargo frequency of visit requirements, a fleet of aircraft, and possible routes, the objective of this research was to develop, implement, and test an iterative procedure to efficiently schedule and load aircraft in order to maximize the flow of cargo through the channel cargo system. Once a level of flow was established, attempts were made to minimize cost in terms of cumulative weighted time-in-system CWTIS. A minimum cost flow heuristic, incorporating a successive shortest path …
Scheduling A Medium-Sized Manufacturing Shop: A Simulation Study, Daniel J. Mcfeely
Scheduling A Medium-Sized Manufacturing Shop: A Simulation Study, Daniel J. Mcfeely
Theses and Dissertations
This study examined the application of simple-to-use, low cost scheduling methods to the operating environment of a medium-sized manufacturing shop. Computer simulation was used to evaluate eighteen different scheduling algorithms, each the result of the combination of a loading and a sequencing rule; due date setting was not considered since due dates are exogenously set. The loading rules investigated were Minimum Machine Required, Lowest Average WIP, and Lowest Average Aggregate Priority Level. The sequencing rules investigated were Priority, EDD, FIS, SPT, Slack, and Slack Ratio. The scheduling algorithms were evaluated against performance measures of mean tardiness, mean flowtime, mean percentage …
The Theory Of Constraints Applied To Project Scheduling: The Critical Chain Concept Defined, Andrew D. Ingram, Paul E. Scherer
The Theory Of Constraints Applied To Project Scheduling: The Critical Chain Concept Defined, Andrew D. Ingram, Paul E. Scherer
Theses and Dissertations
This research applies the Theory of Constraints' principles to a project management environment. The Constraint Theory developed by Dr. Eliyahu M. Goldratt has been successfully applied in many manufacturing settings. Researchers are now beginning to apply Theory of Constraints' principles and techniques outside the manufacturing environment. Specific objectives of this research effort include: to develop and demonstrate a resource constrained project scheduling algorithm based on the Theory of Constraints' principles and techniques: to perform a detailed comparison of the manufacturing and project scheduling environments designed to support algorithm development; and to lay the foundation for additional research in this area …
An Evaluation Of Schedule Metrics Used Within Aeronautical Systems Center, Robert J. Hayes, Lawrence M. Miller
An Evaluation Of Schedule Metrics Used Within Aeronautical Systems Center, Robert J. Hayes, Lawrence M. Miller
Theses and Dissertations
This study focused on a selected group of schedule metrics in use at Aeronautical Systems Center (ASC) acquisition program offices. Over 300 metrics were collected from the System Program Offices (SPOs). The metrics data were sorted into the categories of cost, schedule, and performance. In order to narrow the scope of the project, the team decided to focus on schedule metrics. Seven of the most common schedule metrics were selected for evaluation by a group of five experienced acquisition professionals. The group was asked to input the likely behaviors driven by the metrics being addressed by the study. Next, they …
A Method For Determining Schedule Delay Information In A Channel Cargo Route Network Schedule, Justin E. Moul
A Method For Determining Schedule Delay Information In A Channel Cargo Route Network Schedule, Justin E. Moul
Theses and Dissertations
This research develops a method for measuring schedule effectiveness by determining the amounts of enroute, cargo delay caused by a given aircraft mission schedule. The method is designed to generate information which helps identify flights for which different scheduling might decrease overall cargo delay in the entire network, given that all non-scheduling factors are held constant. The research uses a simplified twelve-airport cargo route network to test the methodology.