Aplicação de uma metodologia de lógica fuzzy à gestão de estoques: um estudo de caso em uma instituição pública

Este trabalho apresenta uma proposta de aplicação de uma metodologia de lógica fuzzy à gestão de estoques de uma instituição pública da administração federal, localizada em Manaus-AM. Inicialmente, é realizada uma revisão da literatura sobre logística e gestão de suprimentos. Em seguida, são abordados assuntos relativos à gestão de estoques. Após isto, são discutidos tópicos referentes à Lógica Fuzzy. A metodologia proposta possibilitará um melhor controle do estoque, uma vez que serão substituídos os tradicionais métodos quantitativos de gerenciamento de estoques. Os dados utilizados foram coletados diretamente do almoxarifado da instituição em estudo, e referem-se à movimentação de estoque de um determinado item, durante o ano de 2009. A utilização da lógica fuzzy tem despertado, cada vez mais, a atenção de pesquisadores de diversas áreas do conhecimento, sendo, porém, que o grande desafio que se coloca aos mesmos é a modelagem dos dados coletados, em virtude do apoio computacional necessário a sua aplicação. A interação com os valores observados, operados pelas regras da lógica fuzzy permite um melhor controle das ações de um almoxarifado, tais como atendimento, reposição e licitação, uma vez que lida com situações de incerteza e subjetividade. A metodologia desenvolvida mostra-se apta a indicar de uma forma melhor a realização das citadas ações, sendo capaz de operacionalizar de forma automatizada o controle e o gerenciamento do estoque.

Gestão de estoque no setor de varejo calçadista: abordagem via análise multivariada e teoria do controle ótimo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Auxílio a tomada de decisão na inclusão de sobressalentes de manutenção em estoque utilizando um sistema especialista fuzzy

In the current economic scenario of constant changes, industries seek to increase their profitability decreasing inventory levels. Maintenance and maintenance management, combined with the inventory management of spare parts, has assumed a position of competitive advantage in business. Stock only what you need has become a difficult decision for managers, who are faced with the lack of models and criteria to assist this decision-making. This work proposes a method which supports decision making, on a MATLAB modeling, using criteria established by an expert and his maintenance workers team, focusing on no regular demand of spare parts. The proposed model was adequate to the needs of the company and the maintenance manager in the decision on the storage

Gestão de Estoques: análise e melhoria do processo de inventário físico em uma indústria siderúrgica

Accuracy in physical inventory process is essential to develop anefficient inventorycontrol. This ensures the availability of products and ensure that the information contained in the information systems areinaccordancewith the reality of inventories. The inventory management policies of the company aim ofthis study established that all the materials in their inventory must becounted, which is proving a challenge. Therefore, the aim of thiswork is to identify the critical inventories and analyze them, seeking flaws and possible improvements in the inventory count process. For this, we used the tools of quality management, such as Pareto and Cause and Effect Diagrams in an action research. The results show that the stocks of finished products are critical in volume and can be hampered by a lack of training and personnel trained in performing the process, as well as limitations in ERP used. With the actions taken against these problems, we could notice an improvement in the process, because the data collection and processing of data has become easier, besides the occurrence of errors decreased. In addition, there was an acceleration in meeting targets compared to the previous period

Verificação da eficiência da metodologia Seis Sigma na redução da divergência de estoque em uma indústria de condutores de fluídos

This work was developed in order to reduce the discrepancy found between the stock data of an item in the system and the amount found physically in stock in the company presented on this study case. Therefore, this paper makes a study on system of information that can assist in the collection, control and manipulation of data regarding the company's stock. It is very important to do the inventory management, so we can control the level of this sub-product to meet sales orders and production. In the study discussed below, we used the Six Sigma methodology to identify points that had flaws in the process and thus improve their work where the results show grater process control and provide a reliable database to the point where no further problems of lack of components in stock

Aumento da precisão do controle de estoque: pesquisa ação em indústria de bens de consumo

This work is an action research conducted in an industry of consumer goods, presenting a new model of inventory management in the company's processors. This replacement of the inventory management of the company stemmed from the need to reduce the large number of deviations in the product write off in stock, thereby generating a low accuracy and reliability of data on inventories of processors shown by the company's ERP system. Spending on inventory adjustments could thus be reduced with the implementation of the new model, thus generating a cost savings for the company and thus increasing their competitive potential in the market. In the old system adopted by the company, write off raw material inventory was done automatically by the system for customized transactions by the company. However, since the implementation of ERP in the company, the automatic write off based on historical consumption of each product were made in many cases at random, generating a lot of mistakes. The new management system has replaced the automatic system by manual at the time of the return of the processed product in the company, thus creating a control which lots and quantities were consumed in the processing and making the stock shown by the ERP reliable and accurate

Proposta de um procedimento de trabalho para gerenciamento de estoque em uma instituição pública de ensino superior

This paper aims to discuss the system of inventory management in a public university. The present paper shows the definitions, classification of materials and the advantages and disadvantages of storage, besides exposing the public procurement bidding system since the acquisition until receipt of materials to be stored. This paper presents a survey of the items stored in the warehouse and use of control tools such as ABC curve to demand flow prized for verification of critical items and idle items. Displays also a calculation for the minimum value of stock and replacement of an item in inventory and an analysis of the conditions of the warehouse layout. As a result, knowledge is acquired and a revised system of inventory management of the institution was proposed

Análise de custos associados a políticas de estoques

Because of the constant increasing global competition, companies increasingly need to develop new competitive advantages and in this context a good logistics system can be both an opportunity for cost reduction and a differential on the client. The system starts at its base, which is formed by the inventory policies. These policies were created to address the strategic issues such as: How much to keep in inventory? How often placing orders? What is the optimal order size? This paper presents a model applied to a real situation of the industry in order to demonstrate the impacts of these policies on costs, as well as a literature review of existing literature related to the subject, for the construction limits and conditions of the model. By applying these concepts the model has been formatted and applied to three different policies, providing a simulation of the results. Finally a comparison is made between the three policies shown and the policy that bests fits the companies’ requirements is indicated

Gestão de estoque em uma empresa de varejo de produtos de limpeza e higiene pessoal

The deficiency in the product inventory management is common in small businesses, affecting several areas, especially the purchasing department that has difficulty in performing their tasks, acquiring the supplier's products at the time and in the most appropriate amount. Especially in the retail sector, the loss of quality of services is visible, because the availability of the product when there is demand is essential for the occurrence of sales and customer satisfaction. In this study, looking to improve inventory management in a retail company of cleaning products and personal hygiene, apply the classification method ABC (or Pareto Rule) to segment the available products. Thus are adopted buying criteria of new products based on the concepts of economic order quantity, safety stock and resupply point. The results show the feasibility of this procedure adopted because it was possible to propose an improved inventory management in a simple and effective way, contributing to company's competitive advantage

Desenvolvimento de uma política de inventário para uma empresa de bens de consumo

This work deals with the creation of an inventory policy, with the main objective of increasing the company's level of service offered to its customers, avoiding plant stops by the lack of raw materials and / or bad inventory management. Calculating safety stock and reorder point of the main raw materials of chemical industry by collecting historical data, statistical analysis and future projections of the company's consumption, and a proposed solution. At the end of the work, have a review of the results

Implantação do sistema kanban para elementos de fixação em maquinas de movimentação de terra

Always seeking the maximum profit under the reduced production time and lower number of failures, companies are increasingly evolving and going after continuous improvement in order to remain competitive in the market. Thus, increasingly there is investment in the management system Lean manufacturing. Lean system is very important, because through it, the maximum value is added in the final product. Being measured by the efficiency and reducing failures to zero. In the studied company, Lean manufacturing system came into effect through the kanban system for purchasing, control and distribution of bulk material used in the assembly of the final product, which are earth-moving machines. It is very important to check the great change made in the company with the implementation of kanban. All inventory management becomes visual, elements are arranged in an organized manner, with addresses in structures, calculated in special boxes and finally, assemblers have the guarantee of an item supply, with the distribution cars located on their assembly area. This study participates effectively assuring the supply. Avoiding any failure on the lack of material, non-compliance of delivery times to the customer and maintenance of over-stock or obsolete inventory, in which case both cause financial loss to the company

Proposta de melhoria do layout de um armazém de vidros automotivos

This work was based on a case study of improvement of the warehouse layout of a multinational automotive glass sector, located in the State of Sao Paulo. The aim was to propose a layout template to be more effective and besides optimizing production would also promote an increase in warehouse packaging capacity for metal containers containing glasses, thus reducing operating costs. To achieve the desired purpose, it was developed two layout proposals and to this end inventory management tools have been used, such as ABC curve and the Spaghetti Diagram, and other concepts of Packaging Engineering and Logistics. By the end of this work, it was obtained as a result, a project in which it was possible to rearrange the packages according the demand, and the developed changes became the most efficient layout both in storage capacity as well as in the internal drive

Classificação multicritério de peças de reposição

Pós-graduação em Engenharia Mecânica - FEG

Game-theoretic view on intermediated exchange

Intermediaries permeate modern economic exchange. Most classical models on intermediated exchange are driven by information asymmetry and inventory management. These two factors are of reduced significance in modern economies. This makes it necessary to develop models that correspond more closely to modern financial marketplaces. The goal of this dissertation is to propose and examine such models in a game theoretical context. The proposed models are driven by asymmetries in the goals of different market participants. Hedging pressure as one of the most critical aspects in the behavior of commercial entities plays a crucial role. The first market model shows that no equilibrium solution can exist in a market consisting of a commercial buyer, a commercial seller and a non-commercial intermediary. This indicates a clear economic need for non-commercial trading intermediaries: a direct trade from seller to buyer does not result in an equilibrium solution. The second market model has two distinct intermediaries between buyer and seller: a spread trader/market maker and a risk-neutral intermediary. In this model a unique, natural equilibrium solution is identified in which the supply-demand surplus is traded by the risk-neutral intermediary, whilst the market maker trades the remainder from seller to buyer. Since the market maker’s payoff for trading at the identified equilibrium price is zero, this second model does not provide any motivation for the market maker to enter the market. The third market model introduces an explicit transaction fee that enables the market maker to secure a positive payoff. Under certain assumptions on this transaction fee the equilibrium solution of the previous model applies and now also provides a financial motivation for the market maker to enter the market. If the transaction fee violates an upper bound that depends on supply, demand and riskaversity of buyer and seller, the market will be in disequilibrium.

Lagerverwaltung und Bestandsmanagement in dezentral gesteuerten Systemen

Die Verwaltung von Lagerbeständen in Unternehmen muss erhebliche Anforderungen an die Datenverfügbarkeit, -sicherheit und -konsistenz erfüllen. Dies wird heute durch eine zentrale Datenhaltung in Lagerverwaltungssystemen gewährleistet. Auf der anderen Seite ist in vielen Bereichen (z. B. Materialfluss- und Transportsteuerung, Produktionssteuerung) eine Entwicklungstendenz in Richtung dezentraler Steuerungsstrategien zu beobachten, welche eine erhöhte Flexibilität und reduzierte Komplexität versprechen. Im Rahmen eines von der Deutschen Forschungsgemeinschaft (DFG) geförderten Projekts werden im vorliegenden Beitrag Konzepte zur verteilten Gestaltung von Lagerverwaltungssystemen vorgestellt und diskutiert.