Dissertations / Theses: 'Inventory Control Management'

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謝永然 and Wing-yin Tse. "Time series analysis in inventory management." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31977510.

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Hilding, Gustaf, and Kristoffer Ryytty. "Consumption-driven Inventory Control : A study of inventory management applied to machining tools." Thesis, KTH, Industriell produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174148.

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Within manufacturing industries, capital is tied up in machines, tools and inventory of unprocessed raw materials as well as finished goods and everything in between, also known as work in progress. Naturally, firms strive to minimize the capital employed in these items and thus facilitate a leaner operation. At the same time, it is important to maintain a stable and uninterrupted production. A prerequisite for maintaining a stable production is that the inputs of the production processes are available at all times. Machining tools need to always be available and easily accessible in order to minimize machine downtime in between batch orders, and if a machine breaks down, the necessary spare parts must be provided quickly. This study has been performed in order to investigate when it would be beneficial for a manufacturer of heavy vehicles to achieve a consumption-driven system for ordering machining tools. More specifically, it looks into the prerequisites and the potential benefits of such a system.This research has been done by conducting a case study at Scania Transmission Machining in Södertälje, Sweden, which is the department responsible for manufacturing conical gears and gear transmission components for Scania’s European production. The case study included a diagnosis of the current inventory control situation, which served the purpose of identifying weaknesses in the system and potential areas of improvement. Furthermore, simulations were conducted based on historical transaction data from the storage unit which supplies tools for the case company. This was done in order to investigate how a consumption-driven inventory control system may be set up in practice and to provide figures on potential monetary gains as well as other benefits.The findings from this study indicate that there are many incentives for Scania Transmission Machining to adopt and implement an inventory control system for machining tools which is based on the consumption. First off, the diagnosis of the current inventory control system revealed several weaknesses and inefficiencies in the system. Furthermore, simulating the inventory levels for a sample of tools showed improvements in terms of the number of days of shortage and in a lower average inventory level. Finally, the monetary savings have been estimated to amount to roughly 1 million SEK per year.
Inom tillverkande industri är kapital bundet i maskiner, verktyg och material av olika slag samt färdiga varor och allt däremellan, även kallat produkter i arbete. Företag strävar efter att minimera det uppbundna kapitalet i dessa enheter i syfte att få till stånd en kostnadseffektiv produktion. Samtidigt som man vill minska mängden uppbundet kapital är det viktigt att bibehålla en stabil produktion. En förutsättning för detta är att produktionsprocessernas råvaror och verktyg alltid finns tillgängliga. Skärande verktyg måste alltid finnas tillgängliga och lättåtkomliga för att minimera stilleståndstiden mellan produktionsordrar, och om en maskin går sönder måste de rätta reservdelarna kunna tillhandahållas snabbt. Den här studien har utförts för att undersöka när det skulle vara fördelaktigt för en tillverkare av tunga fordon att implementera ett förbrukningsstyrt system för beställning av skärande verktyg. Studien fokuserar mer specifikt på de förutsättningar som krävs för att ett förbrukningsstyrt system ska kunna implementeras och på de potentiella fördelarna med ett sådant system.En fallstudie har genomförts på Scania Transmission Machining i Södertälje, Sverige, den avdelning som tillverkar koniska växlar och andra transmissionskomponenter för Scanias europeiska produktion. I fallstudien ingår en diagnos av den aktuella lagerstyrningssituationen i syfte att identifiera svagheter i systemet och potentiella förbättringsområden. Vidare har simuleringar utförts, baserade på transaktioner från förrådsenheten som förser produktionen med verktyg. Detta syftade till att undersöka hur ett förbrukningsstyrt lagerstyrningssystem kan upprättas i praktiken och för att ta utreda vad vinningen i så fall skulle vara.Resultaten från studien visar att det finns många anledningar för Scania Transmission Machining att implementera ett förbrukningsstyrt lagerstyrningssystem för skärande verktyg. Först och främst avslöjade diagnosen av den aktuella lagerstyrningssituationen flertalet brister i systemet. Dessutom visade simuleringarna av verktygens lagernivåer på förbättringar när det gäller antalet dagar med brist och samtidigt en lägre genomsnittlig lagernivå. Slutligen har vinsten med att övergå till en förbrukningsstyrd modell uppskattats uppgå till ca 1 000 000 kronor.

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Veatch, Michael H. "Queueing control problems for production/inventory systems." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12859.

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Bredenkamp, Frederick van Biljon. "The development of a generic just-in-time supply chain optimisation software tool /." Link to the online version, 2005. http://hdl.handle.net/10019/980.

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Diergaardt, Johannes Godfree. "An examination of shortcomings in inventory management and control in selected Saldanha Bay firms." Thesis, [S.l. : s.n.], 2007. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1067&context=td_cput.

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Perry, Ryan Russo Nicholas. "Naval Surface Forces Real-Time Reutilization Asset Management Warehouses a cost-benefit analysis /." Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/MBAPR/2008/Dec/08Dec%5FPerry%5FMBA.pdf.

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"Submitted in partial fulfillment of the requirements for the degree of Master of Business Administration from the Naval Postgraduate School, December 2008."
Advisor(s): Euske, Kenneth ; Wagner, Brett. "December 2008." "MBA professional report"--Cover. Description based on title screen as viewed on January 28, 2009. Includes bibliographical references (p. 53-54). Also available in print.

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Martin, Elysheva S. "Changes needed in DoD's incentive and reward structure to affect inventory reductions in DoD inventory levels." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA323397.

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Dai, Tinglong. "Inventory management in the face of a limited storage capacity /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?IELM%202006%20DAI.

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Villanueva, Nolasco Young Jeffery Estrella Dennis. "Reverse logistics at Command Naval Surfaces Forces Real-time & Reutilization Asset Management (R-RAM) San Diego warehouse." Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/MBAPR/2008/Dec/08Dec%5FVillanueva%5FMBA.pdf.

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"Submitted in partial fulfillment of the requirements for the degree of Master of Business Administration from the Naval Postgraduate School, December 2008."
Advisor(s): Apte, Uday ; Nalwasky, Richard. "December 2008." "MBA professional report"--Cover. Description based on title screen as viewed on January 28, 2009. Includes bibliographical references (p. 41-43). Also available in print.

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Bai, Sherman Xiewei. "Scheduling manufacturing systems with work-in-process inventory control." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13477.

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Avashia, Prashant. "Achievement of efficient operations control through just in time production management." Thesis, Kansas State University, 1985. http://hdl.handle.net/2097/9820.

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Chancasanampa-Mandujano, Jesenia, Karla Espinoza-Poblete, Juan Sotelo-Raffo, Jose Maria Alvarez, and Carlos Raymundo-Ibañez. "Inventory management model based on a stock control system and a kraljic matrix to reduce raw materials inventory." Association for Computing Machinery, 2019. http://hdl.handle.net/10757/656253.

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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.
This research project proposes a supply management model in a consumer goods company in Lima, Peru, to improve stock control and avoid raw materials stockouts and overstock. A Kraljic matrix was used to identify products based on their criticality considering material segmentation, warehouse capacity and times, and ABC segmentation to classify products on each quadrant of the matrix. This project also focuses on defining purchasing and supply strategies in each quadrant of the matrix. This model involves the development of three processes that are related to a new purchasing strategy: economic order quantity, lot-for-lot ordering, and just in time. This new system is based on a more accurate inventory because continuous improvement attracts employees’ attention and engages them in reducing the number of manual notifications made by operators every month. Moreover, after implementing the new procedure for recording inventories, the inventory record was 87% accurate, whereas, in the past, the inventory was not counted and was performed by employees of other areas.

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Pekari, Gregory Chivers Kurt Miles Erickson Brian G. Belcher Robert C. Kartashov Vitalii. "An analysis comparing Commander Submarine Force U.S. Pacific Fleet (CSP) current inventory management tool versus PACFLT Regional Inventory Stocking Model (PRISM) : a proposed demand-based management tool /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FPekari.pdf.

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Thesis (M.B.A.)--Naval Postgraduate School, June 2003.
"MBA professional report"--Cover. Joint authors: Kurt Miles Chivers, Brian G. Erickson, Robert C. Belcher, Vitalii Kartashov. Thesis advisor(s): Raymond Franck, Keebom Kang, Dan Dolk. Includes bibliographical references (p. 119-120). Also available online.

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Stremler, David Jay. "Constraint-based supply chain inventory deployment strategies." Master's thesis, Mississippi State : Mississippi State University, 2001. http://library.msstate.edu/etd/show.asp?etd=etd-11102001-070052.

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Maxwell, Andrew Charles. "A TEACHING JOB SHOP CONTROL SYSTEM WITH REAL-TIME INVENTORY MANAGEMENT." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-06302005-195145/.

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This thesis presents a teaching job shop control system for running in assembly laboratories at colleges and universities in preparing Industrial Engineering students for challenges faced in real-world factories. Current techniques fail to encompass this idea of training for students like the proposed method does. Microsoft Access was used in creating a database that is the center point in this new system. Inventory is managed using this database system and added if parts are created in the manufacturing lab and moved to the assembly area. The system will stop if parts are low until new parts are created. In this new system, a pallet with an unfinished product on it moves down a conveyor system until it reaches the next workstation. At this station, the station operator scans a barcode on the pallet. This barcode contains what product is on this pallet. Based on this information, an ordered list of tasks appears on the workstation computer screen and must be done before the pallet can be moved on. When all tasks have been completed at a station, the station operator clicks ?done? on the screen and then can either move to the next pallet or end the run. Statistics are kept on the quality of the final products and parts as well as a work-in-process and on a goal percentage of good products out at the end of a one-hour time frame. Administrators will be able to assign tasks and parts to products and stations, as well as be able assign the goal ahead of time.

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Sanyal, Chiranjib. "Development of a web based inventory management system for a small retail business." [Denver, Colo.] : Regis University, 2005. http://165.236.235.140/lib/CSanyal2005.pdf.

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Smith, Jane R. Weir Julie. "Work-load planning for Navy stock points." Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA241823.

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Thesis (M.S. in Management (Material Logistics))--Naval Postgraduate School, December 1990.
Thesis Advisor(s): McMasters, Alan W. ; Weir, Maurice. "December 1990." Description based on title screen as viewed on April 2, 2010. DTIC Identifier(s): Inventory control, Navy, work load planning, stock points, warehouse management, theses. Author(s) subject terms: Work-load planning, Navy stock points, TQM, warehouse management. Includes bibliographical references (p. 153). Also available in print.

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Shan, Jun. "Essays on sourcing strategies and inventory management : theory and empirical evidence /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?IELM%202009%20SHAN.

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Ross, Timothy J. "Management of demand based inventory aboard submarine tenders servicing attack (SSN) submarines." Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA241932.

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Thesis (M.S. in Management)--Naval Postgraduate School, December 1990.
Thesis Advisor: McMasters, Alan W. Second Reader: Kang, Keebom. "December 1990." Description based on title screen as viewed on April 1, 2010. DTIC Identifier(s): Attack submarines, computer programs, SUADPS (Shipboard Automated Data Processing System). Author(s) subject terms: Retail inventory management, Shipboard Automated Data Processing System (SUADPS). Includes bibliographical references (p. 81). Also available in print.

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Lewis, Brian Michael. "Inventory Control with Risk of Major Supply Chain Disruptions." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7155.

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This thesis studies inventory control with risk of major supply chain disruptions, specifically border closures and congestion. We first investigate an inventory system in which the probability distributions of order leadtimes are dependent on the state of an exogenous Markov process; we will model border disruptions via this exogenous process. We consider stationary, state-dependent basestock policies, which are known to be optimal for the system under study, and develop an expression for the long-run average cost of an arbitrary policy of this form. Restricting our attention to state-invariant basestock policies, we show how to calculate the optimal basestock (or order-up-to) level and long-run average cost. We provide a sufficient condition for the optimality of a state-invariant basestock policy and monotonicity results for the optimal state-invariant order-up-to level. We finally give the optimal state-invariant order-up-to level for a special class of supply states. Motivated by the possibility of port of entry closures in the event of a security incident, we specialize the previous model to a two-stage international supply chain. A domestic manufacturer orders a single product from a foreign supplier and the orders must cross an international border that is subject to closure. We first assume that border congestion is negligible. The manufacturer's optimal inventory policy and long-run average cost are analyzed. We present structural policy results and the results of a comprehensive numerical study that have important implications for business and for the cooperation between business and government in disruption management and contingency planning. Finally we extend the border closure model to include both border closures and the resulting congestion. We model the border processing system as a discrete-time, single-server queue with constant arrival rate and Markov-modulated service rate. A key task is the development of the leadtime distribution, which is more complex than in the previous model. We present the results of a comprehensive numerical study and provide managerial insights.

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Manikas, Andrew Steven. "Essays in inventory decisions under uncertainty." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22647.

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Thesis (Ph. D.)--Management, Georgia Institute of Technology, 2008.
Committee Chair: Yih-Long Chang; Committee Member: Paul Griffin; Committee Member: Ravi Subramanian; Committee Member: Soumen Ghosh; Committee Member: Srinagesh Gavirneni.

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Ozkan, Erhun. "Stochastic Inventory Modelling." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612097/index.pdf.

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In this master thesis study, new inventory control mechanisms are developed for the repairables in Nedtrain. There is a multi-item, multi echelon system with a continuous review and one for one replenishment policy and there are different demand supply options in each control mechanism. There is an aggregate mean waiting time constraint in each local warehouse and the objective is to minimize the total system cost. The base stock levels in each warehouse are determined with an approximation method. Then different demand supply options are compared with each other.

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Gimpl-Heersink, Lisa, Christian Rudloff, Moritz Fleischmann, and Alfred Taudes. "Integrating Pricing and Inventory Control: Is it Worth the Effort?" SpringerOpen, 2008. http://dx.doi.org/10.1007/BF03342705.

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In this paper we first show that the gains achievable by integrating pricing and inventory control are usually small for classical demand functions. We then introduce reference price models and demonstrate that for this class of demand functions the benefits of integration with inventory control are substantially increased due to the price dynamics. We also provide some analytical results for this more complex model. We thus conclude that integrated pricing/inventory models could repeat the success of revenue management in practice if reference price effects are included in the demand model and the properties of this new model are better understood. (authors' abstract)

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Solyali, Oguz. "An Integrated Inventory Control And Vehicle Routing Problem." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606445/index.pdf.

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In this study, we consider a logistics system, in which a single supplier delivers a product to multiple retailers over a finite time horizon. Supplier decides on the amount to order in each period and services retailers facing deterministic dynamic demand via a fleet of vehicles having limited capacity. Each retailer has specific minimum and maximum levels of inventory in an order-up-to level inventory policy setting. The problem is to simultaneously determine the quantity of product to order to the supplier, retailers to be visited, the quantity of product to be delivered to retailers and routes of vehicles in each period so as to minimize system-wide costs. We present a mathematical formulation for the problem, for which we develop several Lagrangian relaxation based solution procedures providing both upper and lower bounds to the problem. We implement these solution procedures on test instances and present the results. Computational study shows that our solution procedures generate good feasible solutions in reasonable time.

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Horwatt, Robert M. "Web-based inventory management system for the West Virginia State Police." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5204.

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Thesis (M.S.)--West Virginia University, 2007.
Title from document title page. Document formatted into pages; contains ix, 142 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 25).

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Sadeghi, Azadeh. "Global Supply Chain Inventory Management and Production Planning Strategies." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1509528764663001.

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Eades, Douglas R. "An analysis of the Material Returns Program." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA241818.

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Thesis (M.S. in Management)--Naval Postgraduate School, December 1990.
Thesis Advisor(s): San Miguel, Joseph G. Second Reader: Gates, William R. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Identifier(s): Material Returns Program, Inventory Management. Author(s) subject terms: Material Returns Program, Inventory Management. Includes bibliographical references (p. 50-51). Also available in print.

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Karlsson, Per-Johan, and Mariana Porto. "Improving the control of work-in-process at VSM Group AB." Thesis, Jönköping University, JTH, Industrial Engineering and Management, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-1302.

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Today many companies face problems with inventory management. The importance of adequate inventory management has become more evident, while organizations try to reduce their costs and increase their service level.

This master thesis was conducted at VSM Group AB in Huskvarna, which is a manufacturer that produces and delivers sewing machines to a worldwide market. VSM Group AB has problems with the management and the refilling of the work-in-process (WIP) inventories and also with lack of information about component balance and location in the production and material planning system.

Therefore, the purpose of the thesis was to improve the control of the WIP inventories and the information about the components in the production and material planning system. In order to achieve the purpose, interviews and observations were performed, theories in inventory management were reviewed and the production process was studied.

Afterwards solutions for improvements were proposed. To solve the management and refilling problem, a kanban ordering system was proposed, which would use kanban cards to order components from the storages to the WIP inventories. To develop the component information displayed in the production and material planning system, an additional feature was proposed to the system. So instead of showing one inventory balance for each component, the system would display balances for three different places in the factory: the goods arrival and quality control area, the storage and the production.

The proposed solutions can provide several benefits to the company. The kanban ordering system can increase the material handlers’ efficiency, set a standard refilling quantity and be a tool for reducing the WIP inventory levels. The more detailed information in the production and material planning system can improve the decision making for the purchasers and planners and give the ability to measure the flow and level of material inside the factory.

These solutions will provide a more appropriate inventory management to the company, with better control of the components and improved information quality.

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Kaluskar, Pranav. "Inventory management of packaging materials in a pharmaceutical warehouse a case study /." Diss., Online access via UMI:, 2008.

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Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Systems Science and Industrial Engineering, 2008.
Includes bibliographical references.

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Sarkar, Sourish. "Use of Advance Demand Information in Inventory Management with Two Demand Classes." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/38831.

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This work considers inventory systems with two demand classes, where advance demand information is available. Three related scenarios are presented: three-stage production-inventory systems are studied in first two, whereas pure inventory systems are studied in the last scenario. In the first scenario, continuous review production-inventory systems are considered, where only one class provides advance demand information and early demand fulfillment is permitted. A new approach for production replenishment and order fulfillment in such systems is proposed, which combines the benefits of early fulfillment with Kanban-based pull systems. Simulation is used to compare the performance of the resulting policy with two other policies for a variety of scenarios (depending on the arrival rates, system utilizations, cost structures, arrival ratio, priority levels and amount of the advance demand information). A simulation-based lower bound on the optimal cost is established for some specific scenarios. The proposed policy outperforms the existing policies in every setting considered. Also, the proposed policy has added advantage of both retaining the benefit at high system utilizations and increasing the benefit up to the maximum level of advance demand information provided. A small fraction of customers providing advance demand information with early fulfillment acceptable is shown to have higher benefit than all customers providing same advance demand information with no early fulfillment. In second scenario, both classes provide advance demand information in production-inventory systems, though only one class accepts early fulfillment. Different levels of system utilization, arrival ratio and backorder cost are considered in the simulation experiments to show the superiority of early fulfillment. Also, experiments suggest that lowering the expected supply lead time may be more beneficial than increasing the demand lead time by the same amount for production-inventory systems with utilization dependent supply lead times. In third scenario, pure inventory systems are considered, where the demand classes provide different amount of advance demand information, and only one class accepts early fulfillment. The structure of an optimal policy is analytically characterized for periodic review systems under some specific conditions.
Ph. D.

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Xu, He. "Managing the interaction among production, inventory replenishment, and selling in supply chains /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ISMT%202005%20XU.

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Ward, Matthew John. "Fab cycle time improvement through inventory control : a wafer starts approach." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39681.

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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division; in conjunction with the Leaders for Manufacturing Program at MIT, 2007.
Includes bibliographical references (p. 59-60).
Intel's Colorado Springs wafer fabrication facility, known internally as F23, has undertaken several initiatives to reduce cycle time including High Precision Maintenance (HPM), content reduction through the application of Manufacturing Excellence (mX), effective utilization of production equipment, and aggressive inventory control. Each of these efforts has contributed to the marked improvement F23 achieved throughout 2006. F23's cycle time efficiency, the ratio of raw process cycle time to actual fab cycle time, improved from 12% (worst amongst Intel facilities) to greater than 35% (best amongst Intel sites), and overall cycle time was reduced by more than 61% in 2006. Inventory control was found to have a major impact on factory cycle time and performance. F23 controls its factory work-in-process, WIP, inventory through the F23 Wafer Starts Protocol. F23 utilizes Little's Law (Cycle Time = Inventory / Output) to identify target WIP inventory levels required to achieve particular cycle time goals. The target inventory is then achieved by modulating wafer starts. To do this, the Wafer Starts Protocol monitors the inventory of the overall fab and the constraint operations and suggests the amount of wafers to start for each shift.
(cont.) Maintaining the target inventory level drives the overall factory cycle time towards the cycle time goal. Using the starts protocol, F23 has reduced its inventory by 44% while ramping factory output. During the implementation of this wafer starts protocol, F23 began tracking a new inventory metric to determine factory performance. Critical WIP ratio was introduced to evaluate the factory's inventory relative to the theoretical minimum inventory based upon a given factory output level and raw process time. F23 also found that this metric provides an effective comparison of inventory level between fabs. The Fab23 Wafer Starts Protocol is one of the ways in which F23 has applied Manufacturing Science tactics and principles to drive cycle time improvements. F23 has found that inventory control can have significant impacts on factory cycle time. This is one of the reasons why F23 was able to achieve dramatic cycle time improvement.
by Matthew J. Ward.
S.M.
M.B.A.

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Cakmak, Ulas. "On risk-averse and robust inventory problems." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44745.

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The thesis focuses on the analysis of various extensions of the classical multi-period single-item stochastic inventory problem. Specifically, we investigate two particular approaches of modeling risk in the context of inventory management: risk-averse models and robust formulations. We analyze the classical newsvendor problem utilizing a coherent risk measure as the objective function. Properties of coherent risk measures allow us to offer a unifying treatment of risk averse and min-max type formulations. We show that the structure of the optimal policy of the risk-averse model is similar to that of the classical expected value problem for both single and multi-period cases. The result carries over even when there is a fixed ordering cost. We expand our analysis to robust formulations of multi-period inventory problems. We consider both independent and dependent uncertainty sets and prove the optimality of base-stock policies for the general problem formulation. We focus on budget of uncertainty approach and develop a heuristic that can also be employed for a class of parametric dependency structures. We compare our proposed heuristic against alternative solution techniques.

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Edara, Praveen Kumar. "Dynamic Travel Demand Management Strategies: Dynamic Congestion Pricing and Highway Space Inventory Control System." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/28889.

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The number of trips on highways and urban networks has significantly increased in the recent decades in many cities across the world. At the same time, the road network capacities have not kept up with this increase in travel demand. Urban road networks in many countries are severely congested, resulting in increased travel times, increased number of stops, unexpected delays, greater travel costs, inconvenience to drivers and passengers, increased air pollution and noise level, and increased number of traffic accidents. Expanding traffic network capacities by building more roads is extremely costly as well as environmentally damaging. More efficient usage of the existing supply is vital in order to sustain the growing travel demand. Travel Demand Management (TDM) techniques involving various strategies that increase the travel choices to the consumers have been proposed by the researchers, planners, and transportation professionals. TDM helps create a well balanced, less automobile dependent transportation system. In the past, several TDM strategies have been proposed and implemented in several cities around the world. All these TDM strategies, with very few exceptions, are static in nature. For example, in the case of congestion pricing, the toll schedules are previously set and are implemented on a daily basis. The amount of toll does not vary dynamically, with time of day and level of traffic on the highway (though the peak period tolls are different from the off-peak tolls, they are still static in the sense that the tolls don't vary continuously with time and level of traffic). The advent of Electronic Payment Systems (EPS), a branch of the Intelligent Transportation Systems (ITS), has made it possible for the planners and researchers to conceive of dynamic TDM strategies. Recently, few congestion pricing projects are beginning to adopt dynamic tolls that vary continuously with the time of day based on the level of traffic (e.g. I-15 value pricing in California). Dynamic TDM is a relatively new and unexplored topic and the future research attempts to provide answers to the following questions: 1) How to propose and model a Dynamic TDM strategy, 2) What are the advantages of Dynamic TDM strategies as compared to their Static counterparts, 3) What are the benefits and costs of implementing such strategies, 4) What are the travel impacts of implementing Dynamic TDM strategies, and 5) How equitable are the Dynamic TDM strategies as compared to their Static counterparts. This dissertation attempts to address question 1 in detail and deal with the remaining questions to the extent possible, as questions 2, 3, 4, and 5, can be best answered only after some real life implementation of the proposed Dynamic TDM strategies. Two novel Dynamic TDM strategies are proposed and modeled in this dissertation -- a) Dynamic Congestion Pricing and b) Dynamic Highway Space Inventory Control System. In the first part, dynamic congestion pricing, a real-time road pricing system in the case of a two-link parallel network is proposed and modeled. The system that is based on a combination of Dynamic Programming and Neural Networks makes "on-line" decisions about road toll values. In the first phase of the proposed model, the best road toll sequences during certain time period are calculated off-line for many different patterns of vehicle arrivals. These toll sequences are computed using Dynamic Programming approach. In the second phase, learning from vehicle arrival patterns and the corresponding optimal toll sequences, neural network is trained. The results obtained during on-line tests are close to the best solution obtained off-line assuming that the arrival pattern is known. Highway Space Inventory Control System (HSICS), a relatively new demand management concept, is proposed and modeled in the second half of this dissertation. The basic idea of HSICS is that all road users have to make reservations in advance to enter the highway. The system allows highway operators to make real-time decisions whether to accept or reject travellers' requests to use the highway system in order to achieve certain system-wide objectives. The proposed HSICS model consists of two modules -- Highway Allocation System (HAS) and the Highway Reservation System (HRS). The HAS is an off-line module and determines the maximum number of trips from each user class (categorized based on time of departure, vehicle type, vehicle occupancy, and trip distance) to be accepted by the system given a pre-defined demand. It develops the optimal highway allocations for different traffic scenarios. The "traffic scenarios-optimal allocations" data obtained in this way enables the development of HRS. The HRS module operates in the on-line mode to determine whether a request to make a trip between certain origin-destination pair in certain time interval is accepted or rejected.
Ph. D.

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35

Kletter, David B. (David Brian). "Planning and control of an unreliable machine in a multi-item production-inventory system." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10794.

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Chau, Ngan Ngoc. "Intermittent demand forecasting for inventory control : the impact of temporal and cross-sectional aggregation." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127107.

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Thesis: M. Eng. in Supply Chain Management, Massachusetts Institute of Technology, Supply Chain Management Program, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 57-64).
Managing intermittent demand is a challenging operation in many industries since this type of demand is difficult to forecast. This challenge makes it hard to estimate inventory levels and thus affects service levels. The purpose of this study is to examine the impact of multiple levels of data aggregation on forecasting intermittent demand, and subsequently, on inventory control performance. In particular, we propose a procedure that integrates lead-time and customer heterogeneity into the forecasting using temporal and cross-sectional aggregation. Using data from a real-world setting and simulation, our analysis revealed that when high service levels were important for the company operations, the forecasting approach using temporal aggregation that incorporates lead-time information yielded a higher level of inventory efficiency in terms of both the holding cost and the realized service level. It appeared that when forecasts using temporal aggregation were augmented with information about customer behavior, their purchase patterns might be a helpful consideration for enhancing inventory performance. These findings allow us to provide useful recommendations for improving the current forecasting procedure and inventory control to the sponsor company of this project.
by Ngan Ngoc Chau.
M. Eng. in Supply Chain Management
M.Eng.inSupplyChainManagement Massachusetts Institute of Technology, Supply Chain Management Program

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Steiner, Leonard T. "Training in commercial logistics practices to improve inventory management in the Army." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA327083.

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Thesis (M.S. in Management) Naval Postgraduate School, December 1996.
"December 1996." Thesis advisor(s): Paul J. Fields and Keebom Kang. Includes bibliographical references (p. 85-89). Also available online.

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Zhang, Sheng Hao. "Replenishment sequencing and the value of information in a supply chain with balanced ordering /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ISMT%202005%20ZHANG.

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McKay, Mark. "Economic lot scheduling with stochastic demands and lost sales /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/8726.

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Allen, Mary Kay. "The development of an artificial intelligence system for inventory management using multiple experts /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487266691094494.

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Adedeji, Adaku Edith. "Fresh Food Products Inventory Control Management : the challenges in avoiding perishability at the retailers' shelf." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-96173.

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Purpose This study focuses on applicable methods used in the Inventory Management of Fresh Food Products and challenges encountered in their implementation. The area of concentration is the Fresh Food Retailers. Secondly, the challenges encountered in the implementation of fresh food products is also addressed. Methodology The study employs a qualitative research technique with the use of a semi-structured interview for five companies to gather data. Theory The theory section of this study first gives a brief explanation of fresh food retailers’. Secondly, it addresses the keywords of the research questions: Fresh Food Products Inventory Management, highlighting the management of the shelf-life and technological innovations in use in the inventory management of Fresh Food Products. It moves on to address the challenges encountered in the implementation of inventory management systems Empirical This represents the outcome of semi-structured qualitative interviews conducted with five companies. It started with a brief description of the company. Analysis and Discussion The analysis portrays the techniques and models used in the inventory management of shelflife and technological innovations and identification and discussion of implementation challenges or drawback of implementation. Conclusion This addresses my contribution and a futuristic approach to the topic.

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Du, Toit Deirdre. "Decision-making framework for inventory management of spare parts in capital-intensive industries." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96111.

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Thesis (MEng)--Stellenbosch University, 2014.
ENGLISH ABSTRACT: Effective management of spare parts inventory is essential to companies because it influences inventory costs and asset utilization. The vast and diverse portfolio of spare parts, intermittent demand patterns and contradicting objectives between departments are examples of some of the factors that complicate Spare Parts Management (SPM). Managers of spare parts are faced with trade-off decisions between risk and cost on a daily basis. These decisions include, amongst many, determining appropriate stock levels and order frequencies. Despite the importance of SPM, decisions are however often made intuitively in practice with little factual support, and the decision-making process is commonly constrained within departmental silos. Even though there is a large body of academic knowledge on this topic, practical applications of spare parts inventory solutions lag behind theoretical studies. The majority of studies in literature focus on single components of SPM, such as demand forecasting and parts classification, whereas fewer studies consider the decision-making process itself. This study proposes a decision-making framework for spare parts inventory management. The framework is based on a wide-ranging literature review that focuses on capturing the essence of Spare Parts Management (SPM), but also acknowledges the interconnectedness of the problem. Therefore, core inventory management principles, as well as closely related topics such as Supply Chain Management (SCM) and Physical Asset Management (PAM), are studied in the context of spare parts. The broad scope of the literature study leads to a holistic approach to the problem and prevents sub-optimization. The proposed framework condenses principles from various fields of study (SCM, PAM, Classification and Inventory Management) into a stepwise methodology presented as a decision-making framework. The objective of the framework is to provide managers with a structured process, based on factual information, to enable better decision-making in the field. Furthermore, the framework aims to capture the fundamentals of SPM in a simplistic manner to ease the adoption of the framework in practice. A case study is conducted in the South African mining industry to validate the framework. The case study demonstrates that the framework is practical, provides structured guidance, and assists managers to make trade-off decisions in managing spare parts inventory.
AFRIKAANSE OPSOMMING: Effektiewe voorraadbestuur van onderdele is belangrik vir maatskappye omdat dit voorraadkoste en die benutting van bates beïnvloed. Die bestuur van onderdele is ’n komplekse probleem. Ondermeer is die portefeulje van onderdele items breed en divers, die vraagpatrone sporadies en word die voorraadvlakke geaffekteer deur kontrasterende doelwitte tussen verskillende departemente. Bestuurders van onderdele word daagliks gekonfronteer met besluite rakende risiko’s en kostes, soos om toepaslike voorraadvlakke te bepaal en om te besluit wanneer om bestellings te plaas. Hierdie besluite word dikwels intuïtief geneem met min feitelike ondersteuning en insette in die besluitnemingsproses word gereeld beperk tot sekere departemente. Ten spyte van die geweldige akademiese belang in die onderwerp, is daar min suksesvolle praktiese toepassings. Die meerderheid van studies in die literatuur fokus op spesifieke elemente van onderdele bestuur, soos vooruitskatting en klassifisering van parte, terwyl minder op die besluitnemingsproses konsentreer. Hierdie studie stel ’n besluitnemingsraamwerk vir die bestuur van onderdele voorraad voor. Die raamwerk is gegrond op ’n deeglike literatuurstudie wat die essensie van onderdele bestuur ondersoek, maar ook die interverbondenheid van die probleem in ag neem. Voorraadbestuurbeginsels en verwante onderwerpe soos Voorsieningskettingbestuur en Fisiese Batebestuur word dus bespreek. Die breë omvang van die literatuurstudie lei tot ’n holistiese benadering wat sub-optimering van die probleem voorkom. Die voorgestelde raamwerk som beginsels uit verskillende relevante studievelde op in ’n stapsgewyse metode wat voorgestel word as ’n besluitnemingsraamwerk. Die doel van die raamwerk is om bestuurders te voorsien met ’n gestruktureerde proses, gebaseer op feitelike inligting, om besluitneming in die veld te verbeter. Verder poog die raamwerk om die fundamentele konsepte in voorraadbestuur vas te vang in ’n eenvoudige manier sodat die raamwerk maklik geïmplementeer kan word in die praktyk. Die voorgestelde raamwerk is gevalideer deur middel van ’n gevallestudie in die Suid-Afrikaanse mynbedryf. Die gevallestudie toon dat die voorgestelde raamwerk prakties is, die besluitnemingsproses op ’n gestruktureerde wyse lei, en bestuurders help om beter, ingeligte besluite te neem.

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Güller, Mustafa [Verfasser], and Bernd [Akademischer Betreuer] Noche. "Optimal Inventory Control and Distribution Network Design of Multi-Echelon Supply Chains / Mustafa Güller. Betreuer: Bernd Noche." Duisburg, 2016. http://d-nb.info/1102896934/34.

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Martinez, Oscar. "MULTIOBJECTIVE COORDINATION MODELS FOR MAINTENANCE AND SERVICE PARTS INVENTORY PLANNING AND CONTROL." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3985.

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In many equipment-intensive organizations in the manufacturing, service and particularly the defense sectors, service parts inventories constitute a significant source of tactical and operational costs and consume a significant portion of capital investment. For instance, the Defense Logistics Agency manages about 4 million consumable service parts and provides about 93% of all consumable service parts used by the military services. These items required about US$1.9 billion over the fiscal years 1999-2002. During the same time, the US General Accountability Office discovered that, in the United States Navy, there were about 3.7 billion ship and submarine parts that were not needed. The Federal Aviation Administration says that 26 million aircraft parts are changed each year. In 2002, the holding cost of service parts for the aviation industry was estimated to be US$50 billion. The US Army Institute of Land Warfare reports that, at the beginning of the 2003 fiscal year, prior to Operation Iraqi Freedom the aviation service parts alone was in excess of US$1 billion. This situation makes the management of these items a very critical tactical and strategic issue that is worthy of further study. The key challenge is to maintain high equipment availability with low service cost (e.g., holding, warehousing, transportation, technicians, overhead, etc.). For instance, despite reporting US$10.5 billion in appropriations spent on purchasing service parts in 2000, the United States Air Force (USAF) continues to report shortages of service parts. The USAF estimates that, if the investment on service parts decreases to about US$5.3 billion, weapons systems availability would range from 73 to 100 percent. Thus, better management of service parts inventories should create opportunities for cost savings caused by the efficient management of these inventories. Unfortunately, service parts belong to a class of inventory that continually makes them difficult to manage. Moreover, it can be said that the general function of service parts inventories is to support maintenance actions; therefore, service parts inventory policies are highly related to the resident maintenance policies. However, the interrelationship between service parts inventory management and maintenance policies is often overlooked, both in practice and in the academic literature, when it comes to optimizing maintenance and service parts inventory policies. Hence, there exists a great divide between maintenance and service parts inventory theory and practice. This research investigation specifically considers the aspect of joint maintenance and service part inventory optimization. We decompose the joint maintenance and service part inventory optimization problem into the supplier s problem and the customer s problem. Long-run expected cost functions for each problem that include the most common maintenance cost parameters and service parts inventory cost parameters are presented. Computational experiments are conducted for a single-supplier two-echelon service parts supply chain configuration varying the number of customers in the network. Lateral transshipments (LTs) of service parts between customers are not allowed. For this configuration, we optimize the cost functions using a traditional, or decoupled, approach, where each supply chain entity optimizes its cost individually, and a joint approach, where the cost objectives of both the supplier and customers are optimized simultaneously. We show that the multiple objective optimization approach outperforms the traditional decoupled optimization approach by generating lower system-wide supply chain network costs. The model formulations are extended by relaxing the assumption of no LTs between customers in the supply chain network. Similar to those for the no LTs configuration, the results for the LTs configuration show that the multiobjective optimization outperforms the decoupled optimization in terms of system-wide cost. Hence, it is economically beneficial to jointly consider all parties within the supply network. Further, we compare the model configurations LTs versus no LTs, and we show that using LTs improves the overall savings of the system. It is observed that the improvement is mostly derived from reduced shortage costs since the equipment downtime is reduced due to the proximity of the supply. The models and results of this research have significant practical implications as they can be used to assist decision-makers to determine when and where to pre-position parts inventories to maximize equipment availability. Furthermore, these models can assist in the preparation of the terms of long-term service agreements and maintenance contracts between original equipment manufacturers and their customers (i.e., equipment owners and/or operators), including determining the equitable allocation of all system-wide cost savings under the agreement.
Ph.D.
Department of Industrial Engineering and Management Systems
Engineering and Computer Science
Industrial Engineering PhD

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Eddy, Victoria M. "A simulation study of warehouse storage assignment." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0430104-144356/.

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Persson, Jon. "Utveckling av ett användarvänligt arbetssätt som säkerställer att rätt råvara används till rätt produkt." Thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-13570.

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Södra Interiör har en anläggning i Kallinge där man tillverkar golv och paneler av furu. I takt med att produktionen har ökat har även lagernivåerna ökat vilket har ökat risken för att fel råvara används till fel produkt. Syftet med examensarbetet är att ta fram ett arbetssätt som minskar risken för att fel råvara används. Studien visar att något måste göras för att säkerställa att rätt råvara används till rätt produkt. Lagernivån och informationskvaliteten är andra problem som identifierats. Nyckelbegreppen för att lösa problemen är ordning och reda, information, framförhållning och utrymme. Förbättringsförslagen har olika karaktär, där vissa förbättringar kan göras omgående med små resurser medan andra tar längre tid och kräver större resurser. De viktigaste förbättringsförslagen handlar om att skapa mer utrymme i lagret, tydligare uppmärkning av virkespaketens innehåll och bättre informationskvalitet.
Södra Interiör has a plant in Kallinge which manufactures flooring and panels of pine. As production has increased, inventory levels has increased. This has increased the risk that wrong raw material is used for the wrong product. The purpose of this study is to develop an approach that reduces the risk that wrong materials are used. The study shows that something must be done that ensure that correct materials are used for the right product. Stock level and information quality are other concerns identified. Key concepts to solve problems are: well organized, information, advanced planning and space. Improvement proposals are different in nature, where some improvements could be made immediately with few resources, while others take more time and require more resources. The main suggestions for improvement is about creating more space in the warehouse, clearly mark up of the timber package contents and better information quality.

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Kanguru, Rutendo Melody. "Inventory management practices of small, medium and micro enterprises in the Cape Metropole, South Africa." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2431.

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Thesis (MTech (Cost and Management Accounting))--Cape Peninsula University of Technology, 2016.
Small, medium and micro enterprises (SMMEs) in South Africa are perceived to be failing partly due to ineffective management practices. Using a questionnaire survey, this study sought to determine the inventory-management practices of SMMEs operating in the Cape Metropole, and to evaluate the effectiveness of the inventory-management practices currently used by these entities. In addition, the study sought to determine the challenges, if any, that are experienced by SMMEs from the inventory-management practices currently used. This study was motivated by a dearth of research on inventory-management practices of SMMEs. The findings of the study revealed that most of the SMMEs used ‘Rule of Thumb’ as an inventory-management practice. Regarding the effectiveness of the practices used, the study revealed that the SMMEs investigated were perceived to be moderately effective, with SMMEs practising good inventory management techniques such as warehousing, stocktaking, budgeting, good ordering habits and segregation of warehouse duties. In relation to the challenges faced by SMMEs from the inventory-management practices currently used, the findings suggested that theft, shortage of inventory, errors due to incompetent staff, physical inventory not matching up with records and an inability to keep up with the demand of the customers were some of the main challenges faced. This study contributes to the literature on inventory-management practices of SMMEs and fills the gap of knowledge in this neglected area of research. The findings of this study are of significance to the decision-makers of SMEs as they will be enlightened on the best practices and different inventory-management practices that are vital for their businesses’ survival and that have been adopted by their competitors. This should enable them to evaluate their own inventory-management practices and to decide whether to improve, change or continue with their current practice. The South African Government could also draw on the findings of this research to inform its future intervention strategies meant to improve the survival rates of these entities. This could be in the form of the creation of short courses meant to assist SMMEs to improve their inventory-management practices.

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Cooper, William L. "Revenue management, auctions, and perishable inventories." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/25805.

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Zhang, Jiaqi. "Holdout transshipment policy in two-location inventory systems." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/4353.

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In two-location inventory systems, unidirectional transshipment policies are considered when an item is not routinely stocked at a location in the system. Unlike the past research in this area which has concentrated on the simple transshipment policies of complete pooling or no pooling, the research presented in this thesis endeavors to develop an understanding of a more general class of transshipment policy. The research considers two major approaches: a decomposition approach, in which the two-location system is decomposed into a system with independent locations, and Markov decision process approach. For the decomposition approach, the transshipment policy is restricted to the class of holdout transshipment policy. The first attempt to develop a decomposition approach assumes that transshipment between the locations occurs at a constant rate in order to decompose the system into two independent locations with constant demand rates. The second attempt modifies the assumption of constant rate of transshipment to take account of local inventory levels to decompose the system into two independent locations with non-constant demand rates. In the final attempt, the assumption of constant rate of transshipment is further modified to model more closely the location providing transshipments. Again the system is decomposed into two independent locations with non-constant demand rates. For each attempt, standard techniques are applied to derive explicit expressions for the average cost rate, and an iterative solution method is developed to find an optimal holdout transshipment policy. Computational results show that these approaches can provide some insights into the performance of the original system. A semi-Markov decision model of the system is developed under the assumption of exponential lead time rather than fixed lead time. This model is later extended to the case of phase-type distribution for lead time. The semi-Markov decision process allows more general transshipment policies, but is computationally more demanding. Implicit expressions for the average cost rate are derived from the optimality equation for dynamic programming models. Computational results illustrate insights into the management of the two-location system that can be gained from this approach.

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Todd, Kevin Michael. "Factors Affecting Raw Material Inventory Management in the Northeastern United States Pulp and Paper Industry." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/ToddKM2004.pdf.

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Dissertations / Theses on the topic 'Inventory Control Management'

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