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Articles 271 - 300 of 391

Full-Text Articles in Operations and Supply Chain Management

Crisis Airlift Management: Effective Scheduling, David C. Penny Sep 1996

Crisis Airlift Management: Effective Scheduling, David C. Penny

Theses and Dissertations

This is a report on the basis, data, findings, and models developed for US Transportation Command and Headquarters Air Mobility Command. Focusing on the dynamic scheduling problem that arises during management of airlift assets into space-constrained airfields during a crisis, this research explains the conditions surrounding this event, discusses several areas of potential cross-functional applications, presents analysis of current performance, and provides several modeling possibilities for schedule efficiency. Past research in the Flow Management Problem (an airline flow control issue) is extensive, but specific applications in crisis airlift are long in coming, primarily due to the complexity of the environment. …

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An Analysis Of Third Party Logistics And Implications For Usaf Logistics, Thomas J. Thompson Sep 1996

An Analysis Of Third Party Logistics And Implications For Usaf Logistics, Thomas J. Thompson

Theses and Dissertations

This study was undertaken to determine the current trends in third party logistics. The Air Force Material Command Lean Logistics office sought information for improving USAF logistics support. The purposes of this study were to report results of third party logistics use, determine characteristics of successful third party relationships, and to discuss the implications for USAF logistics managers. A qualitative research methodology was chosen using multiple case studies. Logistics managers from eight third party users and ten third party providers were administered an extensive research protocol. The results revealed an industry which is growing rapidly. While the momentum for third …

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Prioritization Schemes Of The Air Force Logistics Reparable Pipeline, Brigham K. Briggs Sep 1996

Prioritization Schemes Of The Air Force Logistics Reparable Pipeline, Brigham K. Briggs

Theses and Dissertations

This study describes the prioritization schemes utilized in the Air Force logistics reparable pipeline. The reparable pipeline is defined and illustrated with flowcharts. A literature review examines previous research conducted on the reparable pipeline, including analytic and conceptual pipeline models, and pipeline management studies. In addition, the topic of prioritization as defined in the production/operations management academic discipline is reviewed. Prioritization schemes of the reparable pipeline are reported in tabular format in addition to descriptions of the various prioritization schemes. Recommendations for pipeline improvement and further research form a basis from which pipeline operation may be improved. p9

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Evaluation Of The Goal System™ Version 2.2 Solution Method For Interactive Constraint Scheduling Situations, Michael D. Stephens Sep 1996

Evaluation Of The Goal System™ Version 2.2 Solution Method For Interactive Constraint Scheduling Situations, Michael D. Stephens

Theses and Dissertations

THE GOAL SYSTEM™ version 2.2 is the latest in a lineage that includes Optimized Production Technology (OPT) and DISASTER™. Earlier work with DISASTER™ revealed potential shortcomings with sequential schedule building algorithms when multiple interactive constraints exist. Since THE GOAL SYSTEM™ version 2.2 has a capacity for simultaneous schedule building, this study evaluated differences between the two algorithms. Using benchmark scheduling problems developed during the earlier evaluation of DISASTER™, a set of THE GOAL SYSTEM™ solutions was created and compared quantitatively to both DISASTER™ solutions and solutions which optimally minimize maximum tardiness. A broad set of performance measurement criteria were also …

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Integration Of The Distribution And Repair In Variable Environments (Drive) Model Into Micap Policy, Bradley E. Anderson Sep 1996

Integration Of The Distribution And Repair In Variable Environments (Drive) Model Into Micap Policy, Bradley E. Anderson

Theses and Dissertations

The United States Air Force has implemented the Distribution and Repair In Variable Environments (DRIVE) Model to a limited degree for a limited range of items, and policy makers seem unsure as to the proper level of DRIVE utilization. New asset release sequences and policies have been proposed without evidence to support those decisions. The purpose of this study is to explore different levels of DRIVE implementation relating to proposed asset release policies in order to provide some evidence on which policy could best support Air Force weapon systems. A second purpose of this study is to show how the …

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A Model For Successful Reutilization Of A Military Installation: A Case Study Of Gentile Air Force Station, Maria L. Garcia Sep 1996

A Model For Successful Reutilization Of A Military Installation: A Case Study Of Gentile Air Force Station, Maria L. Garcia

Theses and Dissertations

Previous research concerning base closure and reutilization focused on the roles of government agencies and the assistance they provided. This study looks at the community and the impact of installation closure. The process of planning for reuse of an installation is difficult and confusing. The guidance provided by the government has changed drastically since the first closures announced in the 1988 Base Realignment and Closure Committee recommendations. This study focuses on the strategy employed by Kettering, OH to successfully reuse Gentile AFS upon closure. As the final part in a longitudinal study, the research focus was lessons learned and implementation …

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Requirement For C-130 Aircraft In The Intratheater Korean Scenario, Philip B. Oglesby Mar 1996

Requirement For C-130 Aircraft In The Intratheater Korean Scenario, Philip B. Oglesby

Theses and Dissertations

In an effort to provide a timely and reasonably accurate methodology for determining C-130 intratheater airlift requirements, this research concentrated on a rough-cut capacity approach using a straight forward linear programming spreadsheet model. To provide more detailed analysis, a more sophisticated linear program was investigated. Specifically, the spreadsheet model calculated the minimum number of C-130s required to carry required cargo, passenger, and aeromedical loads based on user-defined daily requirements. For a given scenario, inputs include the daily requirements and the expected capacity for C-130 aircraft, trucks, and 22-car trains. Included in the capacity inputs are the number of daily cycles …

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Modeling Diminishing Marginal Returns: An Application To The Aircraft Availability Model, Wayne L. Zorn Mar 1996

Modeling Diminishing Marginal Returns: An Application To The Aircraft Availability Model, Wayne L. Zorn

Theses and Dissertations

The Aircraft Availability Model (AAM) provides the Air Force with a worldwide peacetime requirement for reparable spare parts. This research models AAM methodology as it relates to the concept of diminishing marginal returns in resource application. Three separate modeling techniques are investigated with the goal of reformulating the AAM as a mathematical programming model that provides a comparable solution and a capable tool for the conduct of sensitivity analysis. The general formulations presented here are continuous non-linear, continuous linear, and piecewise linear discrete/continuous models. Two formulations of the piecewise linear discrete/continuous model are presented. The piecewise linear model based on …

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The Warehouse Information System (Wins): An Architectural Design For An Information System Employing The World Wide Web To Enhance Foreign Military Sales (Fms) Excess Inventory Management, Chad E. Lemaire Dec 1995

The Warehouse Information System (Wins): An Architectural Design For An Information System Employing The World Wide Web To Enhance Foreign Military Sales (Fms) Excess Inventory Management, Chad E. Lemaire

Theses and Dissertations

The United States Government has long provided security assistance to foreign countries. Each year, billions of dollars of military hardware and equipment are sold through a process known as Foreign Military Sales (FMS). Unfortunately, most countries are now reporting that they are holding many items, sometimes billions of dollars worth, that are excess for their needs. At the same time, there are many countries in need of these items. Countries currently have two options for getting rid of the items they can write them off or try to return them. Countries encounter problems with both of these choices. Naturally, if …

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Re-Engineering The Acquisition Process Of Manufactured On-Demand Only Spares, Mark E. Koesters Dec 1995

Re-Engineering The Acquisition Process Of Manufactured On-Demand Only Spares, Mark E. Koesters

Theses and Dissertations

The purpose of this study is to explore potential alternatives to the current Department of Defense (DoD) acquisition process for low demand, high dollar value, not commercially stocked, spare parts in order to better utilize diminishing resources, reduce cycle costs, and sustain the defense industrial base. Demand for these items is insufficient to justify maintaining inventory, while the buy on-demand alternative results in long lead- times and increased costs due to the labor intensiveness of the current process, lack of willing manufacturing sources, and higher prices paid for small quantities of material. An exploratory case study method was used to …

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An Investigation Into Aircraft Availability, Michael S. Kapitzke Sep 1995

An Investigation Into Aircraft Availability, Michael S. Kapitzke

Theses and Dissertations

The Air Force currently uses an expected value model in the Aircraft Availability Model (AAM) to calculate aircraft availability. However, even with the application of Lean Logistics, the failure-demand rate and the depot repair time are not fixed and the mean value is still used in the model. This research looks at the effect of the magnitude of the variance of the distributions of failure-demand rate and depot repair time. Also, this research evaluates the effect of variable mean failure-demand rates on the variability of aircraft availability. A simulation model was developed which applied the variable failure-demand rates and depot …

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Assessing The Impacts Of Lean Logistics Infrastructures On Strategic Airlift Capability, Russ C. Major Sep 1995

Assessing The Impacts Of Lean Logistics Infrastructures On Strategic Airlift Capability, Russ C. Major

Theses and Dissertations

The purpose of this research was to compare two lean logistics infrastructures to See which one would provide better support for the C-5 aircraft. The level of support was defined as the average number of mission capable parts (MICAPs) created by system operation. One infrastructure had the central storage facility (CSF) located at the depot and the other had a geographically separate CSF. A computer simulation model developed by the Air Force Logistics Management Agency was run for a period of twelve years and the average number of MICAPs for each system was collected. The data was then analyzed using …

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An Evaluation Of The Appropriateness Of The Defense Logistics Agency's Model Requirements Model, Harry A. Berry, Edward E. Tatge Sep 1995

An Evaluation Of The Appropriateness Of The Defense Logistics Agency's Model Requirements Model, Harry A. Berry, Edward E. Tatge

Theses and Dissertations

This thesis discusses the appropriateness of the Defense Logistics Agency's (DLA) requirements model in managing consumable support for Air Force peculiar items. Currently, DLA uses a lot sizing technique referred to as the classic Economic Order Quantity, (EOQ) model. One of the key assumptions of this model is that demand is constant and continuous. Yet with Air Force bases using a lot sizing technique to place their demands for consumable items to DLA, it is apparent that the demand pattern that DLA faces, at least for Air Force peculiar items, is not constant and continuous. This study looks at the …

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A Performance Analysis Of The Air Force War Time Lean Logistics Pipeline, Craig S. Gaddis, David A. Haase Sep 1995

A Performance Analysis Of The Air Force War Time Lean Logistics Pipeline, Craig S. Gaddis, David A. Haase

Theses and Dissertations

Lean Logistics is an innovative proposal designed to reduce the costs associated with reparable inventory management. The purpose of this thesis is to determine whether a wartime lean logistics pipeline can maintain acceptable aircraft availability rates in response to induced variations of order and ship time (OST) and flying hours for deployed forces. The Dyna-MEIRIC Version 6.4 simulation program was used to evaluate nine different factor-level combinations. The factors, OST and flying hours were varied at three different levels, low, medium, and high. Analysis of the results was accomplished using a two-factor ANOVA. The authors discovered that while increasing OST …

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The Impact Of Priority Consistency On The Performance Of A Job Shop, Kenneth W. Bailey Sep 1995

The Impact Of Priority Consistency On The Performance Of A Job Shop, Kenneth W. Bailey

Theses and Dissertations

This study introduces the construct of consistency to production operations management research. As a job passes through a job shop, its priority may or may not remain consistent relative to other jobs in the system. A new classification of priority rules is introduced. Consistent priority rules maintain a jobs priority relative to other jobs throughout the system. Inconsistent priority rules allow a job's relative priority to change as it moves through the system. This study is an initial investigation into the effect of consistency on performance. A simulation experiment was conducted using a full two- factorial repeated measures design with …

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Aligning Demand For Spare Parts With Their Underlying Failure Mode, Steven D. Kephart, Richard C. Roberts Sep 1995

Aligning Demand For Spare Parts With Their Underlying Failure Mode, Steven D. Kephart, Richard C. Roberts

Theses and Dissertations

Current Air Force demand forecasting systems, DO41 and REALM, assume reparable demand is solely flying hour driven. The purpose of this study is to evaluate the relationship between demands, flying hours, and number of sorties at the work unit code level and improve reparable demand forecasting. A three phase methodology is used to analyze the demand, flying hour, and sortie relationship. The first phase uses multiple regression to determine a relationship at various work unit code levels. Multiple regression provides limited correlation between demands, flying hours, and sorties. The second phase uses Poisson regression to evaluate the integer, count nature …

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Tracking Air Force Pallets Using Rfid Technology: A Concept Study, Gary A. Gross Sep 1995

Tracking Air Force Pallets Using Rfid Technology: A Concept Study, Gary A. Gross

Theses and Dissertations

The lack of asset visibility experienced at Aerial Ports of Embarkation (APOEs) during Operation Desert Storm is a phenomenon that has occurred in every major conflict for the last 40 years. The costs associated with this lack of control directly relate to the combat readiness and capability of supported units. This study examined the possibility of installing a Radio Frequency Identification (RF-ID) system to track Department of Defense 463L pallets worldwide. Performance characteristics of commercially available RF-ID systems were summarized, and a conceptual Air Mobility Command (AMC) tracking system was presented. For purposes of concept study, Amtech Corporation's Intellitag RT …

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A Comparison Of The Standard Base Supply System And The Distribution And Repair In Variable Environments Models In Determining A Depot Working Level, Joseph M. Ferris Sep 1995

A Comparison Of The Standard Base Supply System And The Distribution And Repair In Variable Environments Models In Determining A Depot Working Level, Joseph M. Ferris

Theses and Dissertations

The Air Force has adopted a philosophy of logistics operations directed toward improving the products, costs, and responsiveness of the Air Force's reparable pipeline. The philosophy was termed Lean Logistics. This research addressed one problem created through the implementation of Lean Logistics. The problem was determining a depot Working LeveL The Air Force Materiel Command needed to determine an appropriate method to use when determining the depot Working Level. To help determine the appropriate method, this research compared the Standard Base Supply System (SBSS) and the Distribution and Repair In Variable Environments (DRIVE) model. Both models were utilized in two …

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Pharmaceutical Inventory Forecasting At The Wright-Patterson Medical Center, Patrick J. Reymann Sep 1995

Pharmaceutical Inventory Forecasting At The Wright-Patterson Medical Center, Patrick J. Reymann

Theses and Dissertations

This research was conducted to determine the accuracy of statistical forecasting techniques forecasting the inventory of pharmaceutical items. Because pharmaceutical items are subject to a degree of seasonality of demand, the Director of Medical Logistics at the Wright-Patterson Medical Center believed that the use of such techniques may provide a more accurate forecast for the items stocked by the Outpatient Pharmacy. In addition to the technique used by the Outpatient Pharmacy (the 12 month simple moving average) three statistical forecasting methods were employed: the 6 month simple moving average, simple exponential smoothing, and the Winter's exponential smoothing. These techniques were …

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The Process Of Providing Humanitarian Assistance: A Department Of Defense Perspective, Rhonda M. Smith, Barbara J. Stansfield Sep 1995

The Process Of Providing Humanitarian Assistance: A Department Of Defense Perspective, Rhonda M. Smith, Barbara J. Stansfield

Theses and Dissertations

This research effort was a qualitative study on the current process of how the DOD provides humanitarian assistance. Currently the process is not well defined and is situation dependent. Historical documents and current guidelines, policies, and regulations were researched for information on what types of humanitarian assistance the DOD provides, how the process is initiated, and who is involved in the process. Agencies outside of the military, both civilian and government, were researched to determine the extent of coordination necessary for the military to provide humanitarian assistance. A model was compiled to portray the current process and given to key …

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The Effect Of Consolidating Two-Level Reparable Inventories On Aggregate Inventory Requirements And Mission Capability, Glenn R. Barney Sep 1995

The Effect Of Consolidating Two-Level Reparable Inventories On Aggregate Inventory Requirements And Mission Capability, Glenn R. Barney

Theses and Dissertations

One of the proposals of Lean Logistics is the relocation of many inventory assets to Intermediate Supply Points (ISPs). This research investigates the effect of consolidating Two Level Maintenance designated reparable asset inventories. The effects of interest are the potential reduction in aggregate inventory requirement and resulting savings and the effect of delayed issue of the assets on mission capability. The metric selected to measure the effect on mission capability for this study is the Not Mission Capable-Supply (NMCS) rate. A spreadsheet analysis of world-wide Two-Level Maintenance designated reparable asset demands over the study period is used to determine the …

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Order And Ship Times Of Communication-Electronic Components Under Lean Logistics And Conventional Air Force Reparable Pipeline: A Comparative Study, Clifford G. Altizer Sep 1995

Order And Ship Times Of Communication-Electronic Components Under Lean Logistics And Conventional Air Force Reparable Pipeline: A Comparative Study, Clifford G. Altizer

Theses and Dissertations

Lean logistics (LL) is a new logistics system that applies state-of-art business practices utilized in private industry to Air Force logistics processes. Several LL demonstrations have been initiated to develop the best way to implement these new practices in the operational arena. This study focused on the Command, Control, Communications, and Computers (C4) lean logistics demonstration. The repairables in this demonstration differ from aircraft repairables in that they are highly reliable and high-value items. This research determines that the use of LL principles results in shorter order and ship times for the customer. As a follow-on to this finding the …

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A Comparison Of Consistent Versus Inconsistent Scheduling Rules In A Flow Shop Environment, Nicola Gismondi Sep 1995

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. …

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An Empirical Investigation Of The Integrated Weapon System Management Concept Of Seamless Processes, Timothy H. Surabian Sep 1995

An Empirical Investigation Of The Integrated Weapon System Management Concept Of Seamless Processes, Timothy H. Surabian

Theses and Dissertations

This research investigated the way four Air Force Materiel Command (AFMC) single manager organizations operationalized the Integrated Weapon System Management (IWSM) concept of "seamless processes." In this thesis, the IWSM concept of "seamless processes" refers to the degree of integration between acquisition and sustainment organizations. Four SPO organizations were involved in six case studies. This research focused on the way "seamless processes" affect the shifting of the organizational "center of gravity" within or between single manager organizations. An interview questionnaire was administered to 13 Product Center managers and 6 Logistics Center managers. The interview questions focused on IWSM in general, …

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Schedule Management Competencies For Department Of Defense Program Managers, Jeffrey F. Brown Sep 1995

Schedule Management Competencies For Department Of Defense Program Managers, Jeffrey F. Brown

Theses and Dissertations

With ongoing public scrutiny of defense system acquisitions, due to numerous program failures resulting from cost and schedule overruns, now, more than ever, cost and schedule-management competencies are critical to program success. This research examined the schedule-management competencies required of defense program managers. A schedule-management competency model was developed from a foundation of past research. The model was evaluated through a mail survey of 484 intermediate and senior level military program managers assigned to Air Force Materiel Command. The results provided by 243 respondents indicate that 25 of the 28 competencies in the model were valuable to program managers and …

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Why Schedules Slip: Actual Reasons For Schedule Problems Across Large Air Force System Development Efforts, William M. Cashman Sep 1995

Why Schedules Slip: Actual Reasons For Schedule Problems Across Large Air Force System Development Efforts, William M. Cashman

Theses and Dissertations

The three main objectives of this research were to identify the actual reasons for schedule problems across large Air Force system development efforts, to quantity the importance of each category of reasons in terms of frequency and severity, and to demonstrate that the reasons for schedule problems are not program unique, but are common across system development efforts. To this end, this thesis contains a categorization and analysis of 549 reasons for schedule difficulties on 22 large Air Force Engineering and Manufacturing Development (EMD) programs from 1981 to 1994. These aircraft, missile, aircraft equipment, aircraft upgrade, and simulator programs had …

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Evaluation Of The Management Of The Department Of Defense's Wholesale Ammunition Stockpile, David J. Rega Sep 1995

Evaluation Of The Management Of The Department Of Defense's Wholesale Ammunition Stockpile, David J. Rega

Theses and Dissertations

This research solicited expert opinions regarding how well the Single Manager for Conventional Ammunition (SMCA) manages the DoD wholesale ammunition stockpile. Members of the Army, Navy, Air Force, and Marine Corps, as well as members of the SMCA, were surveyed twice. The first survey contained four statements, each referring to a different area of responsibility for the SMCA. These four areas of responsibility were SMCA storage of ammunition, SMCA demilitarization of ammunition, SMCA tiering program for depots, and SMCA customer support. The respondents were asked to provide positive and negative aspects for each area, as well as recommendations for improvements. …

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Life Cycle Costs Of Alternatives For F-16 Printed Circuit Board Diagnosis Equipment, Kent R. Montgomery, Clifford B. Thorstenson Dec 1994

Life Cycle Costs Of Alternatives For F-16 Printed Circuit Board Diagnosis Equipment, Kent R. Montgomery, Clifford B. Thorstenson

Theses and Dissertations

This study analyzes two alternatives for printed circuit board (PCB) diagnosis for the F-16 depot PCB repair shop from a life cycle cost (LCC) perspective. Alternative 1 assumes the use of the current F-16 automatic test equipment (ATE) while Alternative 2 augments the current ATE with infrared imaging test equipment. Infrared imaging is a developed technology that is currently available to the Air Force in a commercial-off-the-shelf (COTS) form. Using the Cost Analysis and Strategy Assessment (CASA) Life Cycle Cost (LCC) Model and data from the DL41 database on F-16 PCBs this study determined that over the current expected life …

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An Analysis Of Iso 9000'S Applicability To Worldwide Warehouse Quality Assurance, Anthony T. Dyess, Henry E. E. Stish Sep 1994

An Analysis Of Iso 9000'S Applicability To Worldwide Warehouse Quality Assurance, Anthony T. Dyess, Henry E. E. Stish

Theses and Dissertations

This study examines the applicability of ISO 9000, a world-wide quality standard, to the quality assurance procedures being built into a new Foreign Military Sales FMS program. This new program, the Worldwide Warehouse, is an Air Force Security Assistance Center AFSAC attempt to assist FMS customers in reducing excess materiel inventories. Areas of investigation include ISO 9000s international acceptance, its ability to ensure quality products, and a case study of SHARE, a NATO initiative which employs ISO 9000 in quality assurance and is dramatically similar to the Worldwide Warehouse. The researchers conduct an exploratory study using a literature review and …

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A Study Of Physical Inventory Methodologies For The Wright-Patterson Afb Medical Center Supply Activity, Steven M. Elkins, Scott A. Parks Sep 1994

A Study Of Physical Inventory Methodologies For The Wright-Patterson Afb Medical Center Supply Activity, Steven M. Elkins, Scott A. Parks

Theses and Dissertations

This study evaluates current and alternative physical inventory methodologies for the Wright-Patterson Medical Center Supply Activity. Four potential physical inventory alternatives were examined 1 100 percent annual physical inventory 2 statistical sampling, 3 continuous cyclic and 4 stratified cyclic. For each alternative the researchers used historical data and a site survey to estimate the effect on physical inventory costs and impact on customer service. The researchers found that statistical sampling was the most economically feasible alternative for the Wright-Patterson Medical Center. However, the method of stratified cyclic produced less extreme scores in both physical inventory cost and customer service parameters …

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