Dissertations / Theses: 'Inventory control Stock control'

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Boussofiane, Abd-El-Aziz. "Ordering and stock holding under inflation." Thesis, Lancaster University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262154.

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Hill, Roger M. "Lost sales inventory models." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302560.

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Pong, Wai-chung. "Interstage stock control for series production lines with variable operation times /." [Hong Kong] : University of Hong Kong, 1985. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12315369.

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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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Melodi, Gabriel Olamitimbo. "Inventory control in a developing economy : the case of Nigeria." Thesis, University of Ulster, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258228.

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龐維宗 and Wai-chung Pong. "Interstage stock control for series production lines with variable operation times." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1985. http://hub.hku.hk/bib/B31207054.

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Angerer, Alfred. "The impact of automatic store replenishment on retail technologies and concepts for the out-of-stocks problem /." Wiesbaden : Deutscher Universitäts-Verlag, 2006. http://www.myilibrary.com?id=134526.

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Southworth, M. S. "An alternative approach to inventory control and forecasting methods in the public and private sectors." Thesis, Cranfield University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237724.

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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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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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Dong, Youqun M. Eng Massachusetts Institute of Technology. "Improving inventory and production control in an electronic company : capacity planning, base stock policy, and Kanban system." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55213.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 85).
This research developed improved methods of inventory and production control in an electronic manufacturing company, which faces fluctuating seasonal demands and is categorized as a multiple part type production system with mixed low and high volume manufacturing. In the first stage of the project, the daily operation in the factory was examined systematically, and it was observed that the factory's original methodologies in demand analysis, capacity planning, material flow control, and production and inventory control were heuristic, and have been introducing confusion and extra uncertainty into the factory. In the second stage of the project, an integrated approach was introduced to the factory. A long-term capacity planning optimization framework was developed for the systematic capacity planning during peak season; ANOVA was applied to identify the demand seasonality; operational changes were made to smooth the material flow in the factory, and a base stock inventory control policy was adopted to improve the inventory and production control at individual stages in the factory. Lastly, a Kanban production control system was developed based on the chosen base stock policy. Using current factory data, the performances of the chosen base stock policy at a single production stage were studied with a simulation model. It was observed that the new inventory control policy could achieve a 17% cost reduction at the studied stage, and even bigger cost reduction for the whole production line.
by Youqun Dong.
M.Eng.

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Tan, Yang. "Optimal Discrete-in-Time Inventory Control of a Single Deteriorating Product with Partial Backlogging." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3711.

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The implicit assumption in conventional inventory models is that the stored products maintain the same utility forever, i.e., they can be stored for an infinite period of time without losing their value or characteristics. However, generally speaking, almost all products experience some sort of deterioration over time. Some products have very small deterioration rates, and henceforth the effect of such deterioration can be neglected. Some products may be subject to significant rates of deterioration. Fruits, vegetables, drugs, alcohol and radioactive materials are examples that can experience significant deterioration during storage. Therefore the effect of deterioration must be explicitly taken into account in developing inventory models for such products. In most existing deteriorating inventory models, time is treated as a continuous variable, which is not exactly the case in practice. In real-life problems time factor is always measured on a discrete scale only, i.e. in terms of complete units of days, weeks, etc. In this research, we present several discrete-in-time inventory models and identify optimal ordering policies for a single deteriorating product by minimizing the expected overall costs over the planning horizon. The various conditions have been considered, e.g. periodic review, time-varying deterioration rate, waiting-time-dependent partial backlogging, time-dependent demand, stochastic demand etc. The objective of our research is two-fold: (a) To obtain optimal order quantity and useful insights for the inventory control of a single deteriorating product over a discrete time horizon with deterministic demand, variable deterioration rates and waiting-time-dependent partial backlogging ratios; (b) To identify optimal ordering policy for a single deteriorating product over a finite horizon with stochastic demand and partial backlogging. The explicit ordering policy will be developed for some special cases. Through computational experiments and sensitivity analysis, a thorough and insightful understanding of deteriorating inventory management will be achieved.

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Hedvall, Lisa, and Emma Mattson. "Lagerstyrning vid varierad efterfrågan : minimering av lagerförings- och ordersärkostnader." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell organisation och produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-27336.

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Sammanfattning Syfte - Syftet med denna studie är att bidra till ökad förståelse för hur lager kan styras när varierad efterfrågan förekommer. För att uppnå syftet är målet med studien att sammanställa processer som underlättar för lagerstyrning vid varierad efterfrågan. Detta möjliggörs genom att besvara följande frågeställningar: 1. Vilka metoder för säkerhetslagerberäkning och lagerstyrning är lämpliga när hänsyn bör tas till varierad efterfrågan? 2. Hur påverkas lagerförings- och ordersärkostnader av olika sätt att styra lager vid varierad efterfrågan? Metod - Teorier angående lagerstyrning vid varierad efterfrågan samlades in via litteraturstudier. En fallstudie genomfördes för att applicera det teoretiska ramverket på empiri från fallföretaget. Empiri samlades in via intervjuer och dokumentationsstudier och utgjorde en grund för beräkningar och vidare analys. Resultat - Lämplig säkerhetslagerberäkning vid varierad efterfrågan anses vara SERV2 som tar hänsyn till antalet bristtillfällen och ger ett bra mått på lagertillgängligheten över tid. De dynamiska lagerstyrningsmetoderna Silver & Meal samt Wagner-Whitin kan i större utsträckning hantera stora variationer i efterfrågan gentemot beställningspunktssystem. Beräkningar resulterade i att Wagner-Whitin var den lagerstyrningsmetod som i majoriteten av fallen genererar lägst totalkostnad när hänsyn tas till lagerförings- och ordersärkostnader. En process för lagerstyrning vid varierad efterfrågan har kartlagts där indata i form av metod- och resursobjekt redogörs. Detta för att bidra till ökad förståelse för hur lager kan styras vid varierad efterfrågan. Implikationer - Inom denna studie framgår det att kostnaderna för lagerstyrningen vid varierad efterfrågan kan sänkas med hjälp av dynamiska lagerstyrningsmetoder. Det är dock viktigt med trovärdig indata för att generera tillförlitliga resultat. Begränsningar - Inom de dynamiska lagerstyrningsmetoderna vägs ordersärkostnad mot lagerföringskostnad och genererar det mest ekonomiska alternativet ur lagerstyrningens perspektiv. Det måste inte vara det bästa ur ett helhetsperspektiv då förändrade orderkvantiteter kan påverka andra delar av materialflödet. De processkartor som är upprättade utgår från den valda lösningen, detta begränsar tillämpningen till verksamheter som har liknande förutsättningar som fallföretaget. Nyckelord - Varierad efterfrågan, lagerstyrning, säkerhetslagerberäkning, lagerstyrningsmetod.
Abstract Purpose - The purpose of this thesis is to develop an understanding of how to control inventory when the demand varies. To achieve the purpose, the goal is to create a process that facilitates inventory management at varied demand. This is feasible by answering following questions: 1. Which methods of safety stock calculation and inventory control are appropriate and take varied demand in consideration? 2. How is the inventory carrying cost and ordering cost affected by different methods of controlling inventory when demand varies? Method - Information about controlling inventory at varied demand was gathered through literature studies. A case study was carried out to apply the theoretical framework on empirical data from the business case. The empirical data was collected through interviews and documentation studies, which provided a basis for calculation and further analysis. Findings - SERV2 is considered as an appropriate method for safety stock calculations since it takes the number of occasions for shortages into account and provides a good measurement of the stock availability over time. The dynamic inventory control methods Silver & Meal and Wagner-Whitin can handle variations in demand better than order point systems. Calculations show that Wagner-Whitin generates the lowest total costs in the majority of cases. A process is established to facilitate inventory management at varied demand. Implications - Within this study it is shown that using dynamic inventory control methods can reduce inventory control costs when demand varies. Nonetheless it is important to have persuasive input to generate reliable results. Limitations - The dynamic inventory control methods balance order cost with inventory carrying costs to find the most economic option from an inventory control perspective. It is not always the best solution from a holistic perspective since changed order quantities can affect other parts of the material flow. The established process charts are based on chosen solution, which limits its application to businesses with similar conditions as the case study. Keywords - Varied demand, inventory control, safety stock calculation, inventory management

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Mogensen, Emma, and Linnéa Bosson. "Lagerstyrning vid volatila inköpspriser : En fallstudie på Alutrade AB i Växjö." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-85623.

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Bakgrund och problemdiskussion: Lagerstyrning är olika aktiviteter som rör hur ett lager hanteras och styrs. Styrningen av ett lager har en stor påverkan på ett företags lönsamhet då det hanterar de aktiviteter som berör lager och därmed också det bundna kapitalet. Lagerstyrning är dock inget som görs i en handvändning, utan det är många delar som ska stämma överens. Lagerstyrningen blir än mer komplex när företag handlar med volatila råvaror. När det kommer till lagerstyrning av produkter med volatila inköpspriser är det viktigt att ta hänsyn till dessa förändringar, för att på så sätt kunna hitta den mest optimala lagerstyrningen. Syfte: Syftet med denna studie är att undersöka vilka konsekvenser som uppstår av att Alutrade inte tar hänsyn till volatila inköpspriser i sin nuvarande lagerstyrning, samt att identifiera vilka lagerstyrningsmetoder, och därmed lagerstyrningspolicy som är lämplig att tillämpa när inköpspriser är volatila för att optimera och uppnå en kostnadseffektiv lageromsättningshastighet. Metod: Uppsatsen behandlas utifrån ett positivistiskt synsätt och ett deduktivt angreppssätt. Uppsatsen har en kvalitativ forskningsmetod men innehåller både kvalitativ och kvantitativ data. Datan har samlats in genom ostrukturerade och semistrukturerade intervjuer, samt mailintervjuer. Resultat: Eftersom Alutrade i dagsläget inte tar så stor hänsyn till de prisförändringar som råder på aluminium marknaden uppstår en del konsekvenser, vilket gör att företagets lagerstyrning påverkas negativt. För att undvika dessa konsekvenser har en lagerstyrningspolicy, som tar hänsyn till volatila inköpspriser, tagits fram. Denna policy utgår från en ABC-klassificering och innehåller lagerstyrningsmetoder såsom modifierad EOQ, beställningspunktsystem vid volatila inköpspriser, säkerhetslager som ett uppskattat antal dagars medelefterfrågan och säkerhetslager beräknat från önskad servicenivå. Med hjälp av den framtagna lagerstyrningspolicyn kan Alutrade undvika konsekvenserna och uppnå de kostnadsbesparingarna som påvisas.
Background: Inventory control is different activities related to how a warehouse is managed. The management of inventory has a big impact on a company's profitability as it manages the activities that concern the inventory and thus has an affect on the tied up capital. However, inventory control is nothing that can be rushed through, since many activities must match. The inventory control becomes even more complex when companies deals with volatile raw materials. When it comes to inventory control of these types of products, it is important to take these changes into account, in order to find the most optimal inventory control. Purpose: The purpose of this thesis is to investigate which consequences that occurs when Alutrade does not take volatile purchase prices into account, furthermore to identify which inventory control methods, and thus inventory control policy, that is suitable to apply when purchase prices are volatile to optimize and achieve a cost-effective inventory turnover. Method: The thesis is based on a positivistic and deductive approach. The study has a qualitative research method but contains both qualitative and quantitative data. The data has been collected through unstructured and semi-structured interviews, as well as mail interviews. Results: As Alutrade currently does not take the price volatility on the aluminum market into much account a number of consequences arise, which means that the company's inventory control is negatively affected. In order to avoid these consequences a inventory control policy, which takes the price volatility into account, has been developed. This policy is based on an ABC classification and contains inventory control methods such as modified EOQ, reorder point system for volatile purchase prices, safety stock as an estimated number of demand days and safety stock calculated from a desired service level. Using the developed inventory control policy, Alutrade can avoid the consequences and achieve the cost savings that are shown.

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Moretti, Diego de Carvalho. "Gestão de suprimentos em um operador logistico." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265519.

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Orientador: Antonio Batocchio
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia mecanica
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Resumo: A concorrência cada vez mais acirrada, efeito principalmente ocasionado pela globalização, tem forçado as empresas a buscarem melhores práticas de atuação no mercado para garantirem a sobrevivência ao longo prazo. Por isso, neste trabalho procurou-se aplicar ferramentas para melhor gerenciamento do estoque de uma operadora logística situada na região de Campinas (SP) que presta serviço para uma grande multinacional também da região. Aplicouse técnicas de previsão de demanda na tentativa de compreender a demanda futura visando uma melhor programação da produção para a operadora logística. Devido ao fato de tratar-se de uma demanda altamente irregular, evidenciou-se que os métodos de previsão aplicados (Média Móvel, Suavização Exponencial Simples e Suavização Exponencial de Holt) não representam a melhor forma para gerenciar a produção e os estoques na empresa estudo de caso deste trabalho. Por isso, foi aplicada a metodologia de revisão contínua do estoque como forma de melhor gerenciar a produção para garantir a melhoria do nível de serviço prestado ao cliente. Foram estabelecidos os parâmetros de estoque de segurança, ponto de reposição do pedido, estoque máximo e quantidade a produzir de cada uma das dez embalagens reoperadas pela empresa que é o estudo de caso desse trabalho. Essa metodologia mostrou-se eficaz e parece gerar bons resultados
Abstract: As a result of the globalization process, the competition among the enterprises has increased so much, forcing them to search for best market practices to warranty their survival in the long term. The objective of this thesis was to apply tools to a better inventory management in a logistics operator, located in Campinas (SP), that serves a big company located in the same region. It was applied demand forecast techniques trying to understand the future demand aiming a better production programming to the logistics operator. But due to a very irregular demand of the system, it was showed that the forecast methods here applied had not helped to establish the best way to manage the case study company production and the inventory. Due to that, it was applied an inventory continuous review methodology to assure the improvement of the service level served to the client. It was established some parameters as safety inventory, reorder point, maximum inventory, and production quantity of each of the ten packages the logistics operator needs to reoperate. This methodology was effective and seems to generate good results
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica

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Råstrander, Frida, and Linnea Hejdenberg. "Lagerstyrning – Förståelse är grunden till förbättring : Utformning av en teoretisk lagerstyrningsmodell för att skapa förståelse för hur lageromsättningshastigheten kan öka samt applicering av denna på Sandviks produktionsavdelning i Svedala för att identifiera möjliga förbättringar." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-53212.

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Bakgrund: För företag som håller lager är en viktig faktor för att lyckas öka effektiviteten att arbeta med lagerstyrning. Lagerstyrning handlar om planering och kontroll av lagret för att kunna serva kunderna och produktionen. Inom lagerstyrning är det viktigt att företag fattar beslut gällande vilken orderkvantitet som ska beställas samt när ordern ska läggas för att finnas tillgänglig på lagret vid rätt tidpunkt. Företag kan använda sig av säkerhetslager vid styrning av sitt lager för att försäkra sig om att de kan hantera osäkerheter i efterfrågan och produktion. Syfte: Syftet med studien är att utifrån analys av lagerstyrningsteori utforma en teoretisk lagerstyrningsmodell för att skapa förståelse för hur lageromsättningshastigheten kan öka. Vidare ska den framtagna modellen empiriskt appliceras på Sandviks produktionsavdelning i Svedalas aktuella artiklar för att identifiera möjliga förbättringar. Metod: Studien har genomförts som en fallstudie på Sandviks produktionsavdelning i Svedala baserat på en teoretisk framtagen lagerstyrningsmodell. Teoriinsamlingen till utformandet av den teoretiska lagerstyrningsmodellen har inhämtats via facklitteratur och vetenskapliga artiklar. Empiriinsamlingen har gjorts med hjälp av intervjuer och numerisk data. Både teori och empiri har sedan analyserats utifrån ett kvalitativt tillvägagångssätt. Avslutande kommentarer: Den framtagna teoretiska lagerstyrningsmodellen börjar med att presentera kriterier som påverkar lageromsättningshastigheten, sedan presenteras steg för att genomföra en ABC-klassificering och slutligen presenteras olika lagerstyrningsmetoder för att bestämma hur orderläggningen ska ske samt hur stortivsäkerhetslagret ska vara. Den teoretiska lagerstyrningsmodellen är pedagogisk och tydlig för att skapa förståelse hos företag om hur de kan öka sin lageromsättningshastighet. Lagerstyrningen som formades utifrån den teoretiska lagerstyrningsmodellen för Sandviks produktionsavdelning i Svedala bestod av orderläggningsmetoderna lot-for-lot, uppskattad orderkvantitet och täcktidplanering samt säkerhetslager baserat på manuella bedömningar och baserat på ledtidsförbrukningen. Med hjälp av denna lagerstyrning ska de proaktivt undvika föråldrat och långsamtgående lager i framtiden.
Background: In order to increase the efficiency for companies that keep inventory, they need to work with inventory control. Inventory control regards planning and control of the inventory to increase customer and production service. Within inventory control, it is important that companies make decisions regarding the quantity to be ordered and when the order will be added to be available in the warehouse at the right time. Companies can use safety stock to ensure that they can deal with uncertainties in demand and production. Purpose: The purpose of this study is, based on analysis of inventory control theory, to design a theoretical model of inventory control to create an understanding for how the inventory turnover may increase. Furthermore, the theoretical model will be empirically applied to Sandvik's production department of Svedala's current articles to indicate improvements. Method: The study has been made as a case study at Sandvik´s production department in Svedala, based on a developed theoretical model of inventory control. Theory collection to the design of the theoretical model of inventory control has been obtained through professional literature and scientific articles. Empirical data has been collected through interviews and numerical data. Both theory and empirical data have been analyzed from a qualitative approach. Concluding remarks: The designed theoretical model of inventory includes criteria that affect inventory turnover, the steps to implement an ABC classification and various inventory control methods to determine how the placement of orders should be implemented and the amount of safety stock that should be held. The theoretical model vi of inventory control is pedagogical and clear to create an understanding regarding how companies can increase their inventory turnover. The inventory control that was formed for Sandvik´s production department in Svedala, on the basis of the theoretical model of inventory control, consisted of the ordering methods, lot-for-lot, estimated order quantity and cover-time planning. The methods for safety stock were safety stock based on manual assessments and on lead time consumptions. With this control Sandvik´s production department in Svedala, proactively can avoid obsolete and slow moving inventory in the future

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Rodrigues, Paulo Cesar Chagas [UNESP]. "A gestão de estoques em sistemas produtivos Engineering-To-Order e Make-To-Stock: estudo de casos em empresas do setor gráfico." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/93017.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
As organizações industriais vêm adotando modelos produtivos que priorizam a redução de custos e aumento da qualidade de seus processos e produtos. Neste contexto a otimização e racionalização da gestão de estoques é uma grande oportunidade para estas empresas conquistarem estes objetivos. Para a realização desta pesquisa optou-se pela metodologia de estudo de casos múltiplos (dois casos), para atender o objetivo de analisar a gestão de estoques em duas empresas do setor gráfico localizadas na região de Bauru, na qual uma adota o sistema produtivo Engineering-To-Order (ETO) e a outra o sistema produtivo Make-To-Stock (MTS). O qual foi alcançado por meio da triangulação dos meios de coleta de dados, ou seja, entrevista semi-estruturada, análise documental e observação in-loco e estes tiveram como embasamento o referencial teórico. Por meio da triangulação das informações obtidas durante a coleta de dados, pôde-se elaborar a descrição da gestão de estoques e do sistema produtivo adotado em cada uma das empresas apresentadas nos estudos de caso e a análise cruzada. Após estes procedimentos foi elaborada a análise da influência do sistema produtivo sobre a gestão de estoques, no qual foram analisados os seguintes itens: produção, previsão de demanda, sazonalidade, layout, gestão de estoques, setup, logística de suprimentos e logística de distribuição.
Industrial organizations are adopting productive models that prioritize the reduction of costs and increase the quality of their processes and products. In this context the optimization and streamlining the inventory management is a great opportunity for these companies conquer these goals. To achieve this research methodology was chosen for the study of multiple cases (two cases), to meet to evaluate the inventory management in two companies in the sector chart located in the region of Bauru, in which one adopts the production system. Which was achieved by means of triangulation of data collection, i.e., semi-structured interviews, document analysis and observation in loco and they were light as the theoretical framework. Through triangulation of information obtained during data collection, it was possible to develop a descritption of the inventory management and the production system used in each of the companies presented in case studies and crossexamination. After these procedures were developed to analyze the influence of the production system on the inventory management, which were analyzed in the following: production, estimates of demand, seasonality, layout, inventory management, setup, logistics supplies and logistics of distribution. While reviewing the analysis of the influence of the production system on the management of inventories could be observed some differences in relation to the literature, they are: logistics supply, distribution, inventory management, production systems Make-To-Stock and Engineering-To-Order.

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Rodrigues, Paulo Cesar Chagas. "A gestão de estoques em sistemas produtivos Engineering-To-Order e Make-To-Stock : estudo de casos em empresas do setor gráfico /." Bauru : [s.n.], 2008. http://hdl.handle.net/11449/93017.

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Orientador: Otávio José de Oliveira
Banca: Fernando Bernardi de Souza
Banca: Marcel Andreotti Musetti
Resumo: As organizações industriais vêm adotando modelos produtivos que priorizam a redução de custos e aumento da qualidade de seus processos e produtos. Neste contexto a otimização e racionalização da gestão de estoques é uma grande oportunidade para estas empresas conquistarem estes objetivos. Para a realização desta pesquisa optou-se pela metodologia de estudo de casos múltiplos (dois casos), para atender o objetivo de analisar a gestão de estoques em duas empresas do setor gráfico localizadas na região de Bauru, na qual uma adota o sistema produtivo Engineering-To-Order (ETO) e a outra o sistema produtivo Make-To-Stock (MTS). O qual foi alcançado por meio da triangulação dos meios de coleta de dados, ou seja, entrevista semi-estruturada, análise documental e observação in-loco e estes tiveram como embasamento o referencial teórico. Por meio da triangulação das informações obtidas durante a coleta de dados, pôde-se elaborar a descrição da gestão de estoques e do sistema produtivo adotado em cada uma das empresas apresentadas nos estudos de caso e a análise cruzada. Após estes procedimentos foi elaborada a análise da influência do sistema produtivo sobre a gestão de estoques, no qual foram analisados os seguintes itens: produção, previsão de demanda, sazonalidade, layout, gestão de estoques, setup, logística de suprimentos e logística de distribuição.
Abstract: Industrial organizations are adopting productive models that prioritize the reduction of costs and increase the quality of their processes and products. In this context the optimization and streamlining the inventory management is a great opportunity for these companies conquer these goals. To achieve this research methodology was chosen for the study of multiple cases (two cases), to meet to evaluate the inventory management in two companies in the sector chart located in the region of Bauru, in which one adopts the production system. Which was achieved by means of triangulation of data collection, i.e., semi-structured interviews, document analysis and observation in loco and they were light as the theoretical framework. Through triangulation of information obtained during data collection, it was possible to develop a descritption of the inventory management and the production system used in each of the companies presented in case studies and crossexamination. After these procedures were developed to analyze the influence of the production system on the inventory management, which were analyzed in the following: production, estimates of demand, seasonality, layout, inventory management, setup, logistics supplies and logistics of distribution. While reviewing the analysis of the influence of the production system on the management of inventories could be observed some differences in relation to the literature, they are: logistics supply, distribution, inventory management, production systems Make-To-Stock and Engineering-To-Order.
Mestre

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Carazas, Ventura Luis Eduardo, and Treviño Manuel Oswaldo Barrios. "Propuesta de un modelo de gestión de inventarios para reducir las roturas de stock mediante la aplicación de herramientas de planificación, control y reabastecimiento en una empresa del sector automotriz." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/653756.

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Uno de los problemas más importantes que aqueja a las empresas ensambladoras y comercializadoras de vehículos es la rotura de stock de productos terminados, la cual perjudica de manera significativa las utilidades por las pérdidas de venta y que por ende tiene un impacto negativo en la rentabilidad de la empresa. Por ello, muchas de las pymes trataron de afrontar esta situación mediante el uso de herramientas como el modelo Q que revisa de forma continua los inventarios pero que no indica cuándo y en qué cantidades la empresa debe abastecer a sus puntos de venta o como el Just in Time que es un sistema de organización de la producción que logra que el producto llegue al cliente justo a tiempo, pero es una metodología que requiere de un alto nivel de desarrollo de los proveedores y gestión eficiente de su cadena de suministro donde las pymes no lograrían alcanzar, así también como el POQ que es una metodología, la cual determina un lote óptimo de compra pero que no determina el tiempo y la forma del abastecimiento. Por ello y en vista de la existencia de diversos esfuerzos e investigaciones con referencia a la gestión de inventarios para solucionar el problema siendo propuestas muy tradicionales con un alcance limitado con respecto a una visión integral del impacto del problema a lo largo de la cadena de suministros. Se plantea desarrollar un sistema de gestión inventarios que permita integrar las técnicas del MRP (Planificación de Requerimientos de Materiales), RFID (identificación por Radiofrecuencia) y CRP (Programa de Reabastecimiento Continuo) con una visión integradora, innovadora y tecnológica para la mejora de manera óptima y eficiente de los procesos. La forma de validación operacional que se propone para este modelo es mediante una simulación de la dinámica de sistemas, la cual es una técnica que permite una mejor comprensión sobre la evolución o comportamiento de los sistemas a través del tiempo y permite descubrir y describir problemas y modelos de manera sistemática. Asimismo, la manera de validar económicamente fue mediante el uso del flujo económico e indicadores financieros. De esta manera, el principal resultado de las validaciones es que en un escenario optimista, donde se consideró un incremento de la exactitud de inventario, reducción del error de previsión, incremento de la calidad de pedidos generados e incremento de las órdenes perfectas, los cuales eran los indicadores principales del modelo se llegó al resultado de una disminución continua de la rotura de stock. . Por ende, se valida la funcionalidad de la propuesta y viabilidad económica, ya que al aplicarlo soluciona el problema de la rotura de stock.
One of the most important problems afflicting vehicle assembly and marketing companies is the stock breakage of finished products, which significantly damages profits due to sales losses and therefore has a negative impact on the profitability of the company. For this reason, many of the SMEs tried to face this situation by using tools such as the Q model that continuously reviews inventories but does not indicate when and in what quantities the company must supply its points of sale or such as the Just in Time, which is a production organization system that ensures that the product reaches the customer just in time, but it is a methodology that requires a high level of supplier development and efficient management of its supply chain where SMEs do not they would be able to achieve, as well as the POQ, which is a methodology, which determines an optimal purchase lot but does not determine the time and form of supply. For this reason, and in view of the existence of various efforts and investigations with reference to inventory management to solve the problem, being very traditional proposals with a limited scope with respect to a comprehensive vision of the impact of the problem throughout the supply chain. . It is proposed to develop an inventory management system that allows integrating the techniques of MRP (Material Requirements Planning), RFID (Radio Frequency Identification) and CRP (Continuous Replenishment Program) with an integrative, innovative and technological vision for the improvement of the optimal and efficient processes. The form of operational validation that is proposed for this model is through a simulation of the dynamics of systems, which is a technique that allows a better understanding of the evolution or behavior of systems over time and allows discovering and describing problems and models systematically. Likewise, the way to validate economically was through the use of economic flow and financial indicators. In this way, the main result of the validations is that in an optimistic scenario, where an increase in inventory accuracy, a reduction in forecast error, an increase in the quality of generated orders and an increase in perfect orders was considered, which were the main indicators of the model, the result of which was a continuous decrease in stock breakage. . Therefore, the functionality of the proposal and economic viability are validated, since when applied it solves the problem of stock breakage.
Trabajo de Suficiencia Profesional

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Guerrero, Rueda William Javier. "Models and optimization methods for the inventory-location-routing problem." Thesis, Troyes, 2014. http://www.theses.fr/2014TROY0002/document.

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Cette thèse considère le problème consistant à intégrer les décisions de routage et stockage lors de la conception de la chaîne logistique. Le but est de sélectionner des dépôts parmi un ensemble de candidats pour desservir un ensemble de détaillants à l’aide d’une ﬂotte de véhicules de capacité permettant visiter plus d’un détaillant par route. On cherche à déterminer la localisation de ces dépôts et les tournées des véhicules aﬁn de maintenir leurs niveaux optimaux de stocks. La demande chez les détaillants est connue à l’avance. Des applications dans les domaines de la logistique humanitaire et militaire sont envisageables. Pour résoudre le problème, deux matheuristiques sont proposées. Dans la première partie, une méthode coopérative qui combine des méthodes exactes pour le problème de conception de la chaîne logistique et des méthodes heuristiques de routage est présentée. Dans la deuxième partie, une méthode de décomposition utilisant une réformulation de Dantzig-Wolf sur les variables de routage est proposée. L’algorithme intègre les concepts de génération de colonnes, relaxation lagrangienne et recherche locale. Les résultats montrent la capacité des algorithmes à trouver des solutions de bonne qualité et nous estimons de façon empirique l’impact de considérer un modèle intégré au lieu d’utiliser une méthode d’optimisation séquentielle. De plus, les résultats des méthodes présentées sur des sous-problèmes sont aussi étudiés. Ces sont: le problème de localisation-routage, le problème de tournées avec gestion de stocks, et le problème de plus court chemin généralisé
The problem of designing a supply chain including simultaneously routing and inventory management decisions is studied in this thesis. The objective is to select a subset of depots to open, the inventory policies for a 2-echelon system, and the set of routes to perform distribution from the upper echelon to the next using a homogeneous ﬂeet of vehicles over a ﬁnite planning horizon. Demand is considered to be known. Applications are found in humanitarian logistics and military logistics. To solve the problem, two matheuristic procedures are developed. On the ﬁrst part a cooperative algorithm combining exact methods for the supply chain design problem and routing heuristics is presented. On the second part, a partition is proposed using a Dantzig-Wolf reformulation on the routing variables. An hybridization between column generation, Lagrangian relaxation and local search is proposed in this part, put together as a heuristic method. Furthermore, results demonstrate the capability of the algorithms to compute high quality solutions and empirically estimate the improvement in the cost function of the proposed model when compared to a sequential optimization approach. Furthermore, results of the proposed methodologies on benchmark instances for subproblems are studied as well. Those are the capacitated location-routing problem, the inventory-routing problem, and the generalized elementary shortest path problem

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Moleli, Moletsane Tarcisius. "Reduction of the causes of stock-outs in ERP supply chain management by prioritization of the causes : a case study at the City of Cape Town." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2725.

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Thesis (MTech (Business Information Systems))--Cape Peninsula University of Technology, 2018.
Enterprise resource planning (ERP) systems have a good reputation for automation and strength in the integration of business processes (BPs), therefore more and more organisations are adopting ERP systems. The City of Cape Town (CCT), a metropolitan municipality, is one of the organisations that have adopted an ERP system. CCT provides a wide range of services to residents and citizens in the Western Cape Province of South Africa. The ERP system at CCT manages the Supply Chain Management (SCM) processes, among others, to ensure good service delivery. ERP systems are able to provide statistical reports on stock-outs; however, the information provided is insufficient to link a specific stock-out to its causes within the SCM process at CCT. This makes it difficult to select the most appropriate solution to minimise the causes and number of stock-outs. The study aims to explore the possible reduction of the causes of stock-outs at CCT stores, therefore the study has adopted a qualitative research methodology with a case study research strategy. It uses subjectivism to understand the truth, with an inductive approach applied to five different interviewee groups, namely the ERP Support Department consultants, the Procurement Department, the Inventory and Stores Management Department, the Master Data Maintenance Department, and the reservation creators. A purposive sampling method is used because the study targets knowledge and experience on the subject from the interviewees in the investigation of the problem. The case is the SCM division at CCT, the unit of analysis is the CCT stores, and the unit of observation is the employees who work for the SCM division of CCT. All ethical procedures and policies of the Cape Peninsula University of Technology (CPUT) are adhered to. For the data collection, in depth semi-structured questions have been developed, and the data were analysed using thematic analysis. The leading causes of stock-outs were discovered by analysing the themes. The results revealed the themes, in descending order according to the causes of stock-outs, as follows: procedures, service delivery, suppliers, stock-outs, human resources, and systems. All the objectives were achieved, thereby answering the research questions.

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Výborná, Kateřina. "Studie dodavatelského řetězce a návrh na optimalizaci." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2017. http://www.nusl.cz/ntk/nusl-316706.

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The diploma thesis focuses on problems related to the low turnover of stocks in IMI International, s.r.o. The thesis is divided into three parts – theoretical, analytical and design part. In the first part there is presented a basic theoretical knowledge of logistics for this work. The second part analyses the causes of high stock holdings in relation to low turnover. Based on the analyses there are finally proposed the solutions in order to reduce the value of held stocks by reducing the quantity which then leads to increased turnover.

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Li, Peng. "Optimization of (R, Q) policies for multi-echelon inventory systems with guaranteed service." Thesis, Troyes, 2013. http://www.theses.fr/2013TROY0014/document.

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Face à une concurrence féroce par suite de la modélisation économique, les entreprises doivent bien gérer leurs chaînes logistiques afin de réduire leurs coûts d’exploitation tout en améliorant leurs services au client. Un enjeu majeur de cette gestion et la gestion efficace des stocks multi-échelons. Dans cette thèse, nous étudions des systèmes de stocks multi-échelons avec des coûts de passation de commande à chaque stock. En raison de l’existence des coûts de passation de commande, l’optimisation d’un tel système devient très compliquée. Récemment, l’approche de service garanti (GSA) a été utilisée pour déterminer les stocks de sécurité pour les systèmes de stocks multi-échelons, mais sans coûts fixes de passation de commande. Nous généralisons la GSA pour optimiser la politique de stockage (R, Q) d’un système de stocks multi-échelons avec la demande suivant un processus de Poisson et coûts fixes de passation de commande à chaque stock. Nous considérons trois types de systèmes de stocks multi-échelons, et pour chaque type, nous d'abord établissons un modèle mathématique pour le problème d’optimisation. Ensuite, le modèle est résolu par une procédure itérative fondée sur deux algorithmes de programmation dynamique (DP). Un algorithme DP est utilisé pour résoudre le sous-problème de détermination de quantités de commande et l'autre est utilisé pour résoudre le sous-problème de détermination de points de recommande du modèle. Les résultats numériques démontrent l'efficacité des algorithmes et de la procédure
With the increasing complexity of supply chains led by economic globalization, integrated supply chain management has become an important strategy utilized by the firms to reduce the overall cost while meeting the customer service. This change has made academic researchers and industrial practitioners pay more and more attention to multi-echelon inventory management over the last two decades. In this thesis, we study multi-echelon inventory systems with fixed order costs at each stock. Because of the existence of fixed order costs, the optimization of such system becomes very complicated. Recently, Guaranteed Service Approach (GSA) was used to set safety stock for multi-echelon inventory systems, but without fixed order costs. We extend the GSA to optimize (R, Q) inventory policies for multi-echelon inventory systems with Poisson demand and fixed order costs. Our objective is to find optimal (R, Q) policy for such a system so that its total cost is minimized while achieving a service level to customer. Three types of multi-echelon inventory systems, serial systems, assembly systems and two-level distribution systems are considered. For each type, we first establish a mathematical model for the optimization problem. Then, the model is solved by an iterative procedure based on two dynamic programming (DP) algorithms. One DP algorithm is used to solve the order size decision subproblem and the other is used to solve the reorder point decision subproblem of the model. Numerical experiments demonstrate the efficiency of the algorithms and the procedure

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Eruguz, Ayse Sena. "Contributions to the multi-echelon inventory optimisation problem using the guaranteed-service model approach." Phd thesis, Ecole Centrale Paris, 2014. http://tel.archives-ouvertes.fr/tel-01011982.

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Many real-world supply chains can be characterised as large and complex multi-echelon systems since they consist of several stages incorporating assembly and distribution processes. A challenge facing such systems is the efficient management of inventory when demand is uncertain, operating costs and customer service requirements are high. This requires specifying the inventory levels at different stages that minimise the total cost and meet target customer service levels. In order to address this problem, researchers proposed the Stochastic-Service Model and the Guaranteed-Service Model (GSM) approaches. These two approaches differ in terms of assumptions with regard to how to address demand variations and service times. This thesis develops several contributions to the GSM based multi-echelon inventory optimisation problem. First of all, we conduct a comprehensive literature review which gives a synthesis of the various GSM work developed so far. Then, we study the impact of some specific assumptions of the GSM such as bounded demand, guaranteed-service times and common review periods. Our numerical analysis shows that the bounded demand assumption may cause a deviation on customer service levels while the guaranteed-service times and common review periods assumptions may result in an increase on the total cost. In real-world supply chains the impact of these assumptions might be significant. Based on the findings presented while investigating the impact of the common review periods assumption, we develop an extension of the GSM that enables to simultaneously optimise the review periods (reorder intervals) and safety stock levels (order-up-to levels) in general acyclic multi-echelon systems. We formulate this problem as a nonlinear integer programming model. Then, we propose a sequential optimisation procedure that enables to obtain near optimal solutions with reasonable computational time. Finally, we focus on the issue of customer service level deviation in the GSM and propose two approaches in order to mitigate this deviation. The numerical study shows that the first approach outperforms the second one in terms of computational time while the second approach provides more accurate solutions in terms of cost. We also present some related issues in decentralised supply chain settings.

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Izaguirre, Malasquez Rosysella, and Gonzales Lucía Otilia Muñoz. "Modelo de optimización de inventarios aplicando el método FIFO y la metodología PHVA para mejorar los niveles de stock de productos olivos en una PYME del sector agroindustrial en Perú." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/655595.

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Las industrias alimentarias afrontan complicados problemas de gestión de inventario, ya que los productos son perecederos, es decir, que en un tiempo determinado el producto ya no será comestible. El problema de la PYME del sector agroindustrial es la ineficiencia en el control de inventario en el almacén de productos terminados. Por ello, la importancia de este proyecto es optimizar el control de inventario de productos olivos. Además, el objetivo de la investigación es minimizar los costos de inventario, ya que actualmente el sobrecosto es de S/ 319 204 soles. Para ello, se establecieron los indicadores de entregas perfectas, exactitud de los inventarios, rotura de stock y rotación de inventarios de manera que se logré un aumento en cada uno de ellos y la estandarización de manera eficiente. Por tal motivo, se va a implementar el método FIFO y la metodología PHVA (planear-hacer-verificar-actuar), también conocida como el ciclo Deming en la empresa agroindustrial con la finalidad de estandarizar los procesos de recepción, ubicación preparación y despacho en el almacén de productos terminados.
Food industries face complicated inventory management problems, since the products are perishable, that is, after a certain time the product will no longer be edible. The problem of the SME of the agro-industrial sector is the inefficiency in inventory control in the warehouse of finished products. Therefore, the importance of this project is to optimize the inventory control of olive products. In addition, the objective of the investigation is to minimize inventory costs, since currently the overcharge is 319 204 soles. For this, the indicators of perfect deliveries, inventory accuracy, stock break and inventory turnover were established so that an increase in each of them and standardization was achieved efficiently. For this reason, the FIFO method and the PHVA (plan-do-verify-act) methodology, also known as the Deming cycle, will be implemented in the agro-industrial company in order to standardize the reception, location, preparation and dispatch processes in the finished goods warehouse.
Trabajo de investigación

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Massonnet, Guillaume. "Algorithmes d'approximation pour la gestion de stock." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00992384.

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Nous considérons des problèmes de gestion des stocks multi-échelon à temps périodique avec des demandes non stationnaires. Ces hypothèses sur la demande apparaissent notamment lorsque des prévisions sur la demande sont utilisées dynamiquement (de nouvelles prévisions sont fournies à chaque période). La structure des coûts comprend des coûts fixes et variables d'approvisionnement, des coûts de stockage et des coûts de mise en attente des demandes. Le délai d'approvisionnement est supposé constant. Le problème consistant à déterminer la politique optimale qui minimise les coûts sur un horizon fini peut être formulé grâce à un programme dynamique. Dans le cadre déterministe, les problèmes auxquels nous nous intéressons sont le plus souvent NP-difficiles, ce qui fait rapidement exploser l'espace d'état. Il devient alors nécessaire de recourir à des heuristiques. Nous nous orientons vers la recherche d'algorithmes d'approximation combinatoires pour le problème One Warehouse Multi Retailers et plus généralement pour des systèmes de distribution divergents. Nous nous intéresserons dans un premier temps à des systèmes de distribution à deux étages avec un entrepôt central et des entrepôts secondaires qui voient la demande finale. Dans un deuxième temps, des structures logistiques plus complexes pourront être considérées. L'objectif sera de proposer des heuristiques originales, basées sur des techniques de répartition des coûts, de les comparer numériquement à la politique optimale sur de petites instances et, si possible, d'établir des garanties de performance.

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Alm, Jonathan, and Kiöhling Marcus von. "Lagerstyrningsmetoders påverkan på totalkostnad : Möjliga ufall för lager med säsongsvarierad efterfrågan." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Logistik och verksamhetsledning, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45423.

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Purpose – To analyze the impact on total cost by inventory control methods under the influence of seasonal demand. The purpose will be answered with following research questions: What inventory control methods can be used when there is seasonal demand? What is the impact of inventory control methods on total cost under the influence of seasonal demand? Method – The study was conducted as a case study and the empirical data was collected through interviews and document study. Both of these contributed to the basis for the analysis and for the calculations in the test of the study. Literature study was conducted and included theories for inventory control methods to answer the first research question, as well as formulas for the methods used to answer the second research question. Findings – It appears from the study, the inventory control methods that can be used when there is seasonal demand and during current planning environment is periodic ordering system and cycle service method. These have been tested further in the study. Seasonal index was considered an important method since it dimensions demand which to a high degree regulate the inventory levels and thereby the result of the inventory control methods. Further the study compares none theoretical inventory control methods and theoretical inventory control methods impact on total cost. It is shown that carrying costs, as a part of total cost, can be reduced by 25% during the peak season and 62% during off-season. This without changing the deliverability. Alternatively, the deliverability can be increased by 10% by using inventory control methods without increasing the total cost of the inventory. Implications – The theoretical contribution of the study is that it has increased the knowledge concerning inventory control methods when there is seasonal demand, and the possible results they might bring. The empirical contribution of the study is that companies can use the study as an indication of the economic benefits and motivation for implementing theoretical inventory control methods. Limitations – The tested inventory control methods did not alter the ordering cost, which to a high degree can have an impact on the total cost. The study also shows a possible impact on the inventory control during the current planning environment. If the planning environment changes, the result of the study can be different.

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Minner, Stefan. "Strategic safety stocks in supply chains /." Berlin [u.a.] : Springer, 2000. http://www.loc.gov/catdir/enhancements/fy0812/00061915-d.html.

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Carlsson, Camilla, and Jonna Rommedahl. "ABC-klassificering och dess användningsområde : En fallstudie inom inköp mot lagerorder." Thesis, Jönköping University, JTH, Logistik och verksamhetsledning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54022.

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Purpose – The purpose of this study is to increase the knowledge of how the inventory can becontrolled and managed when purchasing in conjunction with an ABC-classification. To fulfilthe purpose, two research questions have been formulated: [1] How can the ABC classification be used to manage the purchasing process? [2] How can the ABC classification contribute to improved warehouse service? Method – The study was initiated with a feasibility study in order to shed light on the problemarea and its context which the study intends to investigate further. The feasibility study incombination with a literature review contributed to the formulation of the purpose and researchquestions. The study is designed in accordance with a case study with a singular analysis unit, in this case the purchasing unit in a business system. Furthermore, data collection wasgenerated via literature study, interview, and questionnaire. The interviews and thequestionnaires contributed to qualitative primary data which were intended to illustrate theusers’ knowledge and use of the studied phenomenon. Findings – It was found in the study that ABC classification is an effective method fordifferentiating purchasing and inventory management. This study demonstrates that aninterconnection of ABC classification and inventory service level is the most effective approachin order to control and minimize the occurrence of shortages, resulting in improved warehouseservice. Implications – The subject areas, which first and foremost are ABC classification andinventory management, are thoroughly researched as proven by existing literature, hencegenerating new knowledge to the fields are considered to be challenging. Despite the givencircumstances, this study adds knowledge to a certain extent, as the study presents andstrengthens existing research regarding how a combination of an ABC classification and acertain degree of service level has been shown to streamline the purchasing process andimprove the warehouse service as well as the inventory management. Limitations – This study only includes the users of the business system and the purchasingmodule provided by the case company, which can be considered to affect the generalizability ofthe study. The fact remains, however, that generalizability should also apply in other systemsin connection with purchasing, since the starting point of the theory and its area of applicationis so well known and generally accepted. Keywords – ABC analysis, ABC classification, inventory management, inventory control,safety stock, service level, warehouse service.
Syfte – Syftet med studien är att öka kunskapen om hur olika artikelklassificeringar bör styrasvid inköp. För att besvara syftet har det brutits ner i två frågeställningar: [1] Hur kan ABC-klassificering användas för att styra inköp? [2] Hur kan ABC-klassificering bidra till förbättrad lagerservice? Metod – Studien initierades med en förstudie för att belysa det problemområde och desskontext, vilken studien ämnar undersöka. Förstudien i kombination med litteraturstudie bidrogtill formulering av studiens syfte och frågeställningar. Studien är av enfallsdesign med enanalysenhet, i det här fallet inköpsmodulen i ett affärssystem. Vidare genereradesdatainsamling via litteraturstudie, intervju samt enkät. I samband med intervju och enkäterhölls kvalitativa primärdata som avsåg åskådliggöra användarnas kunskap och användningav det studerade fenomenet. Resultat – ABC-klassificering visar sig vara en effektiv metod för differentiering av inköp ochlagerstyrning. Den här studien påvisar att en sammankoppling av artikelklassificering ochlagerservicenivå är det mest effektiva tillvägagångssättet i syfte att kontrollera och minimerauppkomsten av bristtillfällen som ger upphov till förbättrad lagerservice. Implikationer – Ämnesområdet kring ABC-klassificering och servicenivå är väl utforskatinom befintlig litteratur, vilket bidrar till mindre utrymme att generera ny kunskap till området.Trots given omständighet tillför studien i viss utsträckning kunskap, då genomförd studieframlägger och stärker befintlig forskning då en kombination av ABC-klassificering ochservicenivå har visat sig effektivisera inköpsarbetet. En sådan kombination visar sig i empirinha minimerat antal bristtillfällen och på så vis förbättrat lagerservicen. Begränsningar – Studien inkluderar enbart användare av inköpsmodulen som fallföretagettillhandahåller, vilket kan påverka studiens generaliserbarhet. Faktum kvarstår dock attgeneraliserbarhet även bör gälla i andra fall då inköp görs eftersom utgångspunkten för teorinoch dess användningsområde är så pass känt och allmänt godtaget. Nyckelord – ABC-analys, ABC-klassificering, lagerhantering, lagerservice, lagerstyrning,servicenivå, säkerhetslager.

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Fang, Jianxin. "Analyse et algorithmes de résolution de systèmes ATO (Assemble-To-Order) : Applications aux systèmes du type W." Thesis, Ecole centrale de Lille, 2017. http://www.theses.fr/2017ECLI0012/document.

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Nous analysons un type W de système de l’Assemble-à-commande avec des délais de livraison aléatoires, l'arrivée aléatoire de la demande et des ventes perdues, en temps continu. Nous formulons le problème en tant que processus de décision Markov à l'horizon infini. Nous nous éloignons de l'approche standard en caractérisant une région de l'espace d'état où toutes les propriétés de la fonction de coût tiennent. Nous caractérisons la politique optimale dans cette région. En particulier, nous montrons que, dans l'intérieur de la région récurrente, les composants sont toujours produits. Nous caractérisons également la politique d'allocation de composants optimale qui spécifie si une demande de produit arrivant devrait être remplie. Notre analyse révèle que la politique d'allocation optimale est contre-intuitive. Par exemple, même lorsqu'un produit domine l'autre, en termes de coût/taux de vente perdue, sa demande peut ne pas avoir une priorité absolue par rapport à la demande de l'autre produit. Une telle caractéristique n'a pas été observée dans de nombreux paramètres intégrés de production/inventaire où l'allocation d'inventaire suit une priorité fixe pour satisfaire les exigences. Nous montrons également que la structure de la politique optimale reste la même pour les systèmes à production par lots, les temps de production répartis par Erlang et la demande de produits non unitaire. Enfin, nous proposons des heuristiques efficaces qui peuvent être utilisées comme substitut à la politique optimale ou peuvent être utilisées comme une politique de départ pour les algorithmes communs utilisés pour obtenir une politique optimale dans le but de réduire leur temps de calcul
We analyze a W-configuration assemble-to-order system with random lead times, random arrival of demand, and lost sales, in continuous time. We formulate the problem as an infinite-horizon Markov decision process. We deviate from the standard approach by first characterizing a region (the recurrent region) of the state space where all properties of the cost function hold. We then characterize the optimal policy within this region. In particular, we show that within the interior of the recurrent region components are always produced. We also characterize the optimal component allocation policy which specifies whether an arriving product demand should be fulfilled. Our analysis reveals that the optimal allocation policy is counter-intuitive. For instance, even when one product dominates the other, in terms of lost sale cost and lost sale cost rate (i.e., demand rate times the lost sale cost), its demand may not have absolute priority over the other product’s demand. Such a feature has not been observed in many integrated production/inventory settings where inventory allocation follows a fixed priority in satisfying demands. We also show that the structure of the optimal policy remains the same for systems with batch production, Erlang distributed production times, and non-unitary product demand. Finally, we propose efficient heuristics that can be either used as a substitute for the optimal policy or can be used as a starting policy for the common algorithms that are used to obtain the optimal policy in an effort to reduce their computational time

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Engström, Marcus, and Johan Gembäck. "Lagerdimensionering vid bearbetningsproduktionen hos Volvo Powertrain i Skövde." Thesis, Linköping University, Production Economics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52174.

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Volvo Powertrain tillverkar motorer och drivlinor till AB Volvos samtliga dotterbolag förutom Volvo Aero. Vid anläggningen i Skövde tillverkas motorer och delar till motorer och växellådor och vid anläggningen finns alla tre nödvändiga produktionsområden; gjuteri, bearbetning och montering. När rådande lågkonjunktur slog till stod bearbetningen med väldigt höga lagernivåer vilka företaget snabbt tvingades sänka då det blev huvudfokus från koncernledningen att minska det bundna kapitalet. Utan egentlig analys sattes nya gränsnivåer för lagren inom samtliga avdelningar på bearbetning och målet med examensarbetet har varit att ta fram en metod för att dimensionera säkerhetslagret på optimal nivå med bibehållen hög leveranssäkerhet. Därigenom skulle företagets lagernivåer kunna styrkas med hjälp av en teoretisk grund.

Som utgångspunkt har en lagernivådimensionering med servicenivåkonceptet SERV2 och där alla artiklar tillåts ha differentierade servicenivåer använts. Utifrån Volvo Powertrains förutsättningar har ett optimeringsproblem formulerats. Det visar sig vid närmare studie av detta problem att det är ett ickelinjärt heltalsproblem, vilket försvårar lösningsgången avsevärt. För att komma runt dessa beräkningsmässiga problem approximerades ett av bivillkoren för att ta fram en lösningsheuristik. Dock upptäcktes efter ett antal försök att denna inte uppfyllde samtliga bivillkor alla gånger varför det beslutades att låta heuristikens lösning fungera som startlösning till en sökmetod vid letandet efter lokalt optimum.

I rapporten beskrivs ingående vilka parametrar som behöver mätas och hur för att alla avdelningar ska använda samma mätmetod vid framtagande av nödvändiga indata. Metoden har implementerats i Excel där användaren får mata in värden på dessa parametrar vilka sedan används i de nödvändiga beräkningarna. De data som sedan presenteras som resultat är vilka batchstorlekar som ska produceras, vilken säkerhetslagernivå som ska gälla, vid vilken nivå en ny beställning ska genomföras samt uppnådd leveranssäkerhet.

Utöver denna del presenteras även ett nytt sätt att sköta lagerstyrningen i de fall där det finns en flaskhals tidigt i produktionsflödet och som därmed bestämmer produktionstakten i resten av flödet. Eftersom detta skapar en sugstyrning genom flödet där mellanlager är onödiga blir produktionen mer känslig för störningar, vilket leder till att tidigare dolda problem inom produktionen kommer upp till ytan.

Resultaten av genomförda simuleringar visar att metoden innebär minskade lagernivåer samtidigt som önskad leveranssäkerhet upprätthålls. Genom att implementera metoden kommer bearbetningen vid Volvo Powertrain i Skövde att få en metod att stödja sina beslut på vilken optimerar lagernivåerna samtidigt som en hög leveranssäkerhet garanteras.

Volvo Powertrain produces engines and drivelines to AB Volvo's subsidiaries except to Volvo Aero. At the plant in Skövde engines and parts for engines and transmissions are manufactured and the facility includes all three essential areas of production; casting, machining and assembly. When the current recession hit Volvo Powertrain were working with very high inventory levels, which the company was quickly forced to cut since it became the main focus of the group management to reduce the capital tied up. Without conducting any proper analysis were new stock limit levels set in all sections of the company. The aim of this master thesis was to develop a methodology for setting of safety stocks at optimum levels while maintaining high delivery reliability. This would allow the company's inventory levels to be defined using a theoretical basis.

As a starting point, a stock-level design with the service concept SERV2 together with allowing all articles to have differentiated levels of service was used. On the basis of Volvo Powertrain's conditions an optimization problem have been formulated. It turns out that this problem is a nonlinear integer problem, which makes solution very difficult. To overcome these computational problems one of the constraints were approximated in purpose to develop a heuristics. However, it was detected after several attempts, that the heuristics did not satisfy all the constraints at all times so it was decided to use the heuristic solution to act as a starting solution to a search method to search for a local optimum.

The report describes in detail the parameters that need to be measured and how to ensure that all departments are using the same method in the preparation of the necessary input data. The method has been implemented in Excel where the user may enter values for these parameters which are then used in the necessary calculations. The results that are presented includes what batch-sizes that are to be produced, the safety stock level to be applied, which re-order point to be used and achieved service level.

In addition the report also presents a new way to manage stock control in cases where there is a bottleneck early in the production flow which therefore determines the rate of production in the rest of the flow. Since this creates a pull system through the process flow, the stock between the production steps is unnecessary. A drawback is that the production becomes more sensitive to disturbances but means that previously hidden problems in the production reach the surface.

The results of the simulations attempted show that the method involves reduction of inventory levels at the same time as the desired service level is maintained. By implementing the method Volvo Powertrain in Skövde will have a method to support their decisions which optimizes inventory levels at the same time as high service levels are guaranteed.

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Johnson, Mackie. "Retail Inventory Control Strategies." ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/3171.

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Despite using computerized merchandise control systems in retail, the rate of stockouts has remained stagnant. The inability to satisfy customer needs has caused a loss of 4% in potential revenue and resulted in dissatisfied customers. The purpose of this qualitative multiple case study was to explore cost-effective inventory control strategies used by discount retail managers. The conceptual framework that grounded the study was chaos theory, which helped identify why some business leaders rely on forecasting techniques or other cost-effective strategies as an attempt to prevent stockouts. The target population was comprised of discount retail managers located throughout northeast Jacksonville, Florida. Purposeful sampling led to selecting 6 retail managers who successfully demonstrated cost-effective inventory control strategies for mitigating stockouts. Data were collected through face-to-face semistructured interviews, company websites, and company documents. Analysis included using nodes to identify similar words and axial-coding to categorize the nodes into themes. Transcript evaluation, member checking, and methodological triangulation strengthened the credibility of the findings. Five themes emerged: (a) internal stockout reduction strategies, (b) external stockout reduction strategies, (c) replenishment system strategies, (d) inventory optimization strategies, and (e) best practices for inventory control. This study may contribute to positive social change by improving inventory management, which may reduce demand fluctuations in the supply chain and reduce logistics costs in the transportation of freight thereby leading to improved customer satisfaction.

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ASSIS, VINICIUS VALVERDE DE. "INVENTORY CONTROL USING KANBAN SYSTEM." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2010. https://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=17518@1.

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Esta dissertação apresenta o estudo e aplicabilidade dos conceitos do Just in Time (JIT) e Kanban em modelos de gestão de estoques. O produtos são suprimentos utilizados no processo de surfaçagem de lentes oftalmológicas de um grande fabricante mundial. O trabalho foi desenvolvido no principal laboratório que a empresa detém no Brasil, situado na cidade do Rio de Janeiro. O objetivo foi elaborar uma proposta de controle de estoque de forma a garantir um bom atendimento aos clientes com uma redução de estoque de suprimentos.
This thesis presents the study and applicability of the concepts of Just in Time (JIT) and Kanban in models for inventory management. The products are supplies used in the facing process of ophthalmic lenses of a large global manufacturer. The study was conducted in the main laboratory that the company owns in the country, located in the city of Rio de Janeiro, inside the distribution center and attends strategic customers in the state. The objective was to develop a proposed of inventory control to ensure to the best customers service with a reduction of inventory of supplies.

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Yin, Tzu-Hsiao. "Multi-warehouse inventory control system." CSUSB ScholarWorks, 2006. https://scholarworks.lib.csusb.edu/etd-project/3102.

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The thesis discusses the development of Multi-Warehouse Inventory Control System (MWICS), a uniquely designed web application that targets membership based food wholesalers. The main goal of MWICS is to provide a real-time inventory control ability to all warehouses and present them as if it were single warehouse. The program consists of three main components: user account management sub-system, product and purchase management sub-system, and a warehouse inventory management sub-system. User interfaces are constructed primarily in HTML, PHP, and Javascript. MySQL is used to add, access, and process data.

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García, Salcedo Carlos Andrés. "Inventory Control in Supply Chains: An Internal Model Control Approach." Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/116201.

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Esta tesis se basa en el diseño de estrategias de gestión de inventario en cadenas de suministro usando la teoría de control. El principal objetivo es proponer un esquema de control para resolver los principales problemas que aparecen en el controla gestión de inventario de una cadena de suministro (incertidumbre en el retardo, el efecto látigo y el déficit de inventario). Este objetivo principal se divide en dos objetivos: 1. La neutralización de los efectos causados por el retardo de entrega de un pedido. 2. Diseño de políticas de inventario que permitan un balance entre el rechazo a la perturbación (demanda) y el seguimiento del inventario objetivo. Dado que el esquema de control por modelo interno (IMC) permite tratar los objetivos (1) y (2) bajo el mismo paradigma de control, pero de una manera disociada, éste se presenta en esta tesis como una nueva política de reposición de inventario en cadenas de suministro. Sin embargo, el IMC requiere el conocimiento del retardo para compensar sus efectos. Esta situación no es viable cuando el retardo cambia durante el proceso, situación común en las cadenas de suministro. Por lo tanto, la investigación empieza con la identificación del retardo. Así, en esta tesis se formula un algoritmo de identificación que permite estimar el verdadero valor de los retardos de la cadena de suministro. Estos valores se utilizan para adaptar el bloque de retardos en el esquema de control. De ese modo, el objetivo (1) se finaliza. El objetivo (2) se basa en el diseño de los controladores del esquema IMC. El objetivo de los controladores de IMC es mantener los niveles de inventario de la cadena de suministro cerca del inventario objetivo mitigando el efecto látigo. Cada entidad de la cadena de suministro puede operar en varios modos de trabajo durante el tiempo: suministro infinito y suficiente existencia, (SISE), suministro infinito y Bajas existencia, (SIBE), Suministro limitado, (SL). Cuando el tiempo de espera es demasiado largo y existe incertidumbre en la demanda, muchas empresas optan por utilizar una estrategia de inventario de seguridad para garantizar la satisfacción de la demanda del cliente. En virtud de esta estrategia de la cadena de suministro está siempre en el modo de trabajo (SISE). Cuando el inventario es insuficiente, la cadena de suministro puede trabajar en cualquiera de los modos de trabajo (SISE), (SIBE) o (SL). Por lo tanto, comenzamos proponiendo el diseño del sistema de control para una cadena de suministro bajo la estrategia de inventario de seguridad (SISE). El diseño está basado en las directrices del esquema IMC en el cual se realiza un balance entre la mitigación del efecto látigo y el seguimiento del inventario. Después de eso, el sistema de control se diseña para una cadena de suministro trabajando sin inventario de seguridad (es decir, en cualquier modo de funcionamiento (SISE), (SIBE) o (SL)). Por lo tanto, se propone un sistema de control de inventario conmutado bajo la estrategia de control descentralizado. Este consiste en un banco de controladores diseñados para cada posible caso de funcionamiento de cada entidad y una lógica de conmutación que selecciona el mejor controlador en cada instante de tiempo. Así, el objetivo (2) está terminado.
This thesis relies on the design of inventory management strategies in supply chain systems by using control theory approaches. The main objective is to propose a control scheme to solve the principal problems appearing in the inventory control of the supply chain (uncertainty in the lead time, the bullwhip effect and the inventory drift). This objective is divided in two particular objectives: 1. On the one hand, the counteraction of effects caused by the existing delay between the time at which an order is placed on the immediate supplier and the moment at which the petition is satisfied. 2. On the other hand, the design of inventory policies allowing a trade-off between the disturbance (demand) rejection and the inventory target tracking. Since the internal model control scheme (IMC) allows to tackle the objectives (1) and (2) under the same paradigm of control but in a decoupled way, the IMC scheme is presented in this thesis as a novel inventory replenishment policy for the entire supply chain. Nevertheless, the IMC requires the perfect knowledge of the lead time to compensate its effects. This situation is not viable when the delay changes during the process which is a common situation in supply chains. Hence, first of all, the research is focused on the identification of the lead time. As a result of this part of the research, an identification algorithm that allows to estimate the actual delay values of the entire supply chain at each time interval is formulated. The estimated delay values are used to adapt the delay block in the control scheme. Thereby, the particular objective (1) is finalised. The objective (2) relies on the design of the IMC scheme controllers. The aim of the IMC controllers is to keep the inventory levels of the supply chain close to the inventory target mitigating the bullwhip effect. Each echelon of the supply chain may operate under several working modes during the time: Infinite Supply and High stock, (ISHS), Infinite Supply and Low Stock, (ISLS), Limited Supply, (LS). When the lead time is too long and there exist uncertainty in the demand level, many companies choose to use a safety stock strategy to assure the customer demand satisfaction. Under this strategy the supply chain is always in the (ISHS) working mode. When the stock is insufficient, the supply chain may work under any of (ISHS), (ISLS) or (LS) working modes. Therefore, we start proposing the design of the control scheme for supply chain under safety stock strategy (ISHS). The design is based on the IMC guidelines where a trade-off between the bullwhip effect avoidance and inventory tracking is carried out, which is the second objective of the research. After that, the control scheme is designed for a supply chain working without safety stock (i.e. under any working mode (ISHS), (ISLS) or (LS)). Therefore, we propose a switched inventory control system for a serial multivariable supply chain under decentralized control strategy. This consists in a bank of controllers designed for each possible operation case of each echelon and a switching logic that selects the best controller at each instant time. Thus, the objective (2) is finalised.

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Cao, Jie. "Stochastic inventory control in dynamic environments." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011469.

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Bai, Liwei. "Inventory control and demand distribution characterization." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-02032005-114800/unrestricted/bai%5Fliwei%5F200505%5Fphd.pdf.

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Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2005.
Paul Griffin, Committee Member ; Kwok-Leung Tsui, Committee Chair ; Christos Alexopoulos, Committee Co-Chair ; Hengqing Ye, Committee Co-Chair ; David Goldsman, Committee Member. Vita. Includes bibliographical references.

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Chen, Xin 1973. "Coordinating inventory control and pricing strategies." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29598.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2003.
Includes bibliographical references (p. 127-130).
Traditional inventory models focus on effective replenishment strategies and typically assume that a commodity's price is exogenously determined. In recent years, however, a number of industries have used innovative pricing strategies to manage their inventory effectively. These developments call for models that integrate inventory control and pricing strategies. Such models are clearly important not only in the retail industry, where price-dependent demand plays an important role, but also in manufacturing environments in which production/distribution decisions can be complemented with pricing strategies to improve the firm's bottom line. To date, the literature has confined itself mainly to models with variable ordering costs but no fixed costs. Extending some of these models to include a fixed cost component is the main focus of this thesis. In this thesis, we start by analyzing a single product, periodic review joint inventory control and pricing model, and characterizing the structure of the optimal policy under various conditions. Specifically, for the finite horizon periodic review case, we show, by employing the classical k-convexity concept, that a simple policy, called (s, S, p), is optimal when the demand functions are additive. For the model with more general demand functions, we show that an (s, S, p) policy is not necessarily optimal. We introduce a new concept, the symmetric k-convex functions, and apply it to provide a characterization of the optimal policy. Surprisingly, in the infinite horizon periodic review case, the concept of symmetric k-convex functions allows us to show that a stationary (s, S, p) policy is optimal for both discounted and average profit models even for general demand functions.
(cont.) Our approach developed for the infinite horizon periodic review joint inventory control and pricing problem is then extended to a corresponding continuous review model. In this case, we prove that a stationary (s, S, p) policy is optimal under fairly general assumptions. Finally, the symmetric k-convexity concept developed in this thesis is employed to characterize the optimal policy for the stochastic cash balance problem.
by Xin Chen.
Ph.D.

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Moreno, Victoria, and Ahmed Yusef Ahmed. "Inventory control and organization of warehouse." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-12799.

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Kless, David R. "A comparison of an alternative inventory control concept with the Navy's existing wholesale inventory control procedures for repairables." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA356538.

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Thesis (M.S. in Operations Research) Naval Postgraduate School, September 1998.
"September 1998." Thesis advisor(s): Kevin J. Maher. Includes bibliographical references (p. 53-54). Also available online.

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Benbitour, Mohammed Hichame. "Gestion de stocks et d’opérations de logistique interne dans l’industrie automobile : cas d’application chez Faurecia." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC023.

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Cette thèse traite de diverses problématiques liées à la gestion des opérations dans l'industrie automobile. Plus particulièrement, les modèles développés cherchent à améliorer la gestion des stocks et des opérations de logistique interne chez Faurecia, un équipementier automobile. Dans un premier temps, à l’aide d’un modèle de simulation à événements discrets, nous déterminons les niveaux de stocks nominaux optimaux et les dates de lancement de production optimales de produits finis dans les usines d’assemblage, de type longue distance. L'impact de l’utilisation de l'information avancée sur la demande en termes de réduction de coûts de stock et de pénalités de retard est évalué. Ensuite, nous proposons un modèle analytique approximatif pour optimiser les niveaux de stock de sécurité de composants qui minimisent les coûts de stock et des livraisons exceptionnelles.Le modèle proposé est appliqué dans une usine de type courte distance et présente des réductions de coût intéressantes par rapport au modèle de calcul utilisé en pratique. Avant de développer ce nouveau modèle, nous déterminons la loi de probabilité de la demande relative aux composants et nous proposons une méthode générale d'analyse de la demande de composants dans les systèmes d’assemblage à la commande. La dernière partie de la thèse traite de la gestion des opérations de cross-docking interne (dans l’usine) en comparant différentes politiques de cross-docking couramment utilisées en pratique. Ce travail permet de comparer les politiques (en termes de coût de stockage et de main d’œuvre) et d’identifier les contextes dans lesquels il est intéressant d’utiliser chacune d’elles. Plusieurs extensions et perspectives de recherche sont proposées à la fin de la thèse
This thesis addresses new research questions related to operations management in the automotive industry. More particularly, we aim at improving inventory control and internal logistics operations management in Faurecia, an auto parts maker. First, by using a discrete event simulation model, we calculate the optimal base stocks levels and optimal release lead times of finished goods in long-distance plants. The impact of using advance demand information on inventory holding and backorder penalty costs reduction is evaluated. Then, we propose an approximate analytical model to optimize components safety stock that minimizes inventory holding and rush ordering costs.The proposed model is applied in a short-distance plant and shows interesting cost reductions compared to the currently used calculation model. Before developing this new model, we determine the probability distribution of components demand and propose a general method of components demand analysis in Assemble-to-Order systems. We also study the management of internal (plant) cross-docking operations by comparing different cross-docking policies commonly used in practice. The cost related to each policy is assessed in terms of surface and man-hours. Several extensions and research perspectives are proposed at the end of the manuscript

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O'Leary, Bryan F. "Multi-echelon inventory control for arborescent systems." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/24548.

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何添賢 and Tim Yin Timothy Ho. "Forecasting with smoothing techniques for inventory control." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B42574286.

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Ortiz, Olga L. "Stochastic inventory control with partial demand observability." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22551.

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Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2008.
Committee Co-Chair: Alan L Erera; Committee Co-Chair: Chelsea C, White III; Committee Member: Julie Swann; Committee Member: Paul Griffin; Committee Member: Soumen Ghosh.

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Ho, Tim Yin Timothy. "Forecasting with smoothing techniques for inventory control." Click to view the E-thesis via HKUTO, 1994. http://sunzi.lib.hku.hk/hkuto/record/B42574286.

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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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Ismail, Siti Z. B. "Product-service system inventory control : manufacturing perspectives." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23645.

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This thesis explores the role of Inventory Control in Product Service System (PSS) applications within manufacturing contexts. This research led to a new approach for dealing with inventory control and contributes to understanding of the PSS paradigm in manufacturing industries. PSS embraces the product and service continuum as one system; meanwhile, Inventory Control has led to substantial improvements in performance across many industries. PSS and Inventory Control have for many years been recognized in the scientific literature and by industry as enablers of manufacturing operations. Most studies in the field of PSS and Inventory Control have only focussed on its individual scenarios; little is known about where the boundaries of PSS should lie as it needs to integrate both external and internal elements in managing PSS Inventory Control. To date, very little research has been reported related to inventory control in product-service systems from manufacturing operations perspectives. Research has been done in three stages: (1) PSS characteristics were synthesised from the literature; (2) current industry example of PSS inventory were investigated through a survey; four case studies were developed; (3) uncertainty elements were identified from the literature related to the current PSS Inventory Control scenario and these were evaluated, developed and validated producing a generic model. The research carried out involved collecting primary data from qualitative research conducted through four case studies with companies in the United Kingdom and Malaysia; and information from secondary sources; utilising techniques such as survey, interview, matrix and modelling language method. This thesis contributes to the current PSS research by developing a generic model of PSS Inventory Control from manufacturing operations perspectives and a PSS Inventory Control (PSSIC) Framework.

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Bregman, Robert Louis. "An investigation of multiechelon inventory control systems /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487591658174761.

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Hedenstierna, Carl Philip. "Staggered deliveries in production and inventory control." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/87502/.

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This thesis investigates production-inventory systems where replenishments are received every period (for example every day or shift), but where production plans are determined less frequently (weekly, fortnightly, or monthly). Such systems are said to use staggered deliveries. This practice is common in industry, but the theoretical knowledge is limited to a small set of inventory models, none of which include capacity costs. This thesis uses time series analysis to expand our understanding of staggered deliveries from the perspectives of inventory and production-inventory control. The contribution to inventory theory consists in the development of an optimal policy for autocorrelated demand and linear inventory costs, including exact expressions for costs, availability, and fill rate. In addition the thesis identifies a procedure for finding the optimal order cycle length, when a onceper- cycle audit cost is present. Notably, constant safety stocks are suboptimal, and cause both availability and fill rate to fluctuate over the cycle. Instead, the safety stocks should vary over time, causing the availability, but not the fill rate, to be constant. The contribution to production-inventory theory comes from two perspectives: First, an optimal policy is derived for quadratic inventory and capacity costs; second, four pragmatic policies are tested, each affording a different approach to production smoothing and the allocation of overtime work (once per cycle, or an equal amount of overtime every period). Assuming independent and identically distributed demand, these models reveal that all overtime or idling should be allocated to the first period of each cycle. Furthermore, it is shown that the order cycle length provides a crude production smoothing mechanism. Should a company with long reorder cycles decide to plan more often, the capacity costs may increase. Therefore, supply chains should implement a replenishment policy capable of production smoothing before the order cycle length is reduced.

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Lam, Chi-lap. "Analysis of inventory systems with demands met either from inventory or by special deliveries /." [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12359907.

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Dissertations / Theses on the topic 'Inventory control Stock control'

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