El presente trabajo de investigación tiene como objetivo reducir el índice de devoluciones de una empresa de consumo masivo. Se aplicó la metodología Lean Warehousing y la herramienta VRP para plantear una solución al problema. El proyecto se divide en cuatro capítulos. En el primer capítulo se desarrolla los conceptos y bases teóricas en las que se fundamenta la propuesta. El segundo capítulo presenta el entorno de la empresa, los procesos realizados y los roles que desempeñan cada uno de los trabajadores. También, se identifica el problema a resolver, para ello se requirió utilizar como herramienta el árbol de decisiones para identificar las causas raíz, las cuales son explicadas y fundamentadas. El tercer capítulo plantea 2 metodologías que ayudarán a resolver las 4 causas principales. La primera metodología consiste en determinar la ruta de transporte óptima y la segunda metodología plantea mejorar el abastecimiento y control de productos dentro del almacén. Finalmente, se presenta los costos de la implementación y los beneficios que se obtendrían con la implementación de las propuestas. Por último, el cuarto capítulo se expone los resultados de la implementación con la finalidad de reducir el índice de devoluciones. Así como, la reflexión del proyecto y las recomendaciones para futuras investigaciones. / This research work aims to reduce the rate of returns of a mass consumption company. The Lean Warehousing methodology and the VRP tool were applied to propose a solution to the problem. The project is divided into four chapters. In the first chapter the theoretical concepts and bases on which the proposal is based are developed. The second chapter presents the company's environment, the processes performed and the roles that each of the workers play. Also, the problem to be solved is identified, for this it was required to use the decision tree as a tool to identify the root causes, which are explained and substantiated. The third chapter presents 2 methods to help resolve the 4 main causes. The first methodology consists in determining the optimal transport route and the second methodology proposes to improve the supply and control of products within the warehouse. Finally, the implementation costs and the benefits that would be obtained with the implementation of the proposals are presented. Finally, the fourth chapter describes the results of the implementation in order to reduce the rate of returns. As well as, the reflection of the project and the recommendations for future research. / Trabajo de Suficiencia Profesional

This masterś thesis, titled as The Study of Order Process Control in Company Invensys Appliance Controls s.r.o., deals with optimization of order process from the first entering of new order till the delivery of finished goods to final customer. Further I provide the basic characteristics and analysis of Invensys Company. The project part is divided into two parts. The first one is focused on explaining of operation of Kanban system and itś possibility to improve the material flow in company. The second one is focused on long-term forecasts (demand predictions) provided by customers, which can help to improve the process of order as well. In conclusion, I appraise advantages and disadvantages of Kanban system and forecasts.

This master’s thesis is aimed to improvement of the management of orders in ISMA Jevíčko L.t.d. Company. This company is interested in construction market. The thesis solves the theoretic basics and its implementation on company mentioned above. Further, there are new methods of company and order course management, suggested. For improvement of customer services I used outsourcing IS/IT, marketing outsourcing, ecological standards, TQM method and other useful science procedures.

The thesis is focused on the study and optimize inventory management at Kordárna Plus, a. s. The theoretical part describes the characteristics of the basic concepts related to inventory management, classification, costs associated there with and methods of inventory control. The practical part is focused on the analysis of stocks on the process of procuring, warehousing and inventory control. This analysis uncovered deficiencies for which they proposed solutions. Proposals should lead to improved inventory management in the company.

The level of customer satisfaction largely depends on manufacturer’s ability to respond to customer orders with promptness. The swiftness with which the manufacturers are able to meet customer demand is measured by the service level. There are two service level measures typically used. The first one is type 1 service level which denotes the probability of not stocking out over a planning period. The other is fill rate which denotes the proportion of demand satisfied with the existing inventory. We review the rich and diverse literature available on inventory cost optimization under these service level constraints. Subsequently two optimization models are developed for the two different types of service level measures. The goal is to determine the safety stock values for all products in a multi product inventory required to achieve aggregate type 1 and type 2 service levels at the minimum inventory cost. For both the models we also maintain a minimum threshold for individual type 1 and type 2 service level for every product. The models are solved using Lagrangian relaxation techniques. The models are computationally solved in Microsoft Excel. We then carry out discrete event simulation to validate the results and to test the performance of the models. To provide the decision makers with an idea of variability in the service levels and the related risks associated with it on an immediate finite horizon planning scale we also carry out simulation for a time span of one, two and four years. The results obtained show desired type 1 and type 2 service levels for products with under both infinite and finite planning horizons.

This thesis aims to improve the inventory control system of a company´s RDC in Norrköping, Sweden. Inefficiencies and non-optimal processes have been identified in the current system, which could negatively affect operations. The study addresses three questions: understanding the current system, identifying improvements, and adjusting the improved system to fit inventory control constraints. A literature review and case study were conducted, revealing lower service levels and higher costs than expected. Experimental scenarios were simulated to examine different improvements, such as using economic order quantity, different safety stock equations, and investigating service levels. / <p>Examensarbetet är utfört vid Institutionen för teknik och naturvetenskap (ITN) vid Tekniska fakulteten, Linköpings universitet</p>

The case study has been carried out at SSAB Oxelösund, where a major project is on the way to improve the system support for substance planning, to ensure that the right products are actually produced. Purpose: The purpose of this thesis is to analyze inventory control in intermediate storage within steel industry with data-driven methods and simulation. Where the thesis aims to identify the causes and improvement opportunities of the missing products at the intermediate storage. Method: This study consisted of quantitative research with a deductive approach. Which was done by analyzing the forecast accuracy and erroneous product at rolling, and study how changes in safety stock and batch sizes affect the production with help of discrete event simulation. All analysis was done on secondary data provided by SSAB. Results: Few product groups had high percentual error and absolute error. About one percent of products at rolling had wrong product type. Lastly, the study found that larger batches resulted in less orders being missed. The changes of safety stocks did not have any significant impact on the simulation, due to possible errors under simulation modeling.  Conclusion: Depending on the actual production in other steel industries, the contribution of this thesis only applies to similar production. Suggestions for future research should be to improve the simulation and apply other inventory control methods. In addition, to try other forecasting methods to improve the demand forecasts and try to find a root of the problem for wrong production.

No description available.

Thesis (MScIngwet)--University of Stellenbosch, 2004. / ENGLISH ABSTRACT: This thesis is a case study in optimal inventory control, applied to Clickabox factory, a South African cardboard box producer from whom cardboard boxes may be ordered at short notice via the internet. The problem of developing a decision–support system for optimal stockholding at the factory, in order to minimize cardboard off–cut wastage subject to required service levels, is addressed in this thesis. Previously a simple replenishment policy, based largely on experience, was implemented at the factory. The inventory model developed for and applied to Clickabox in this thesis takes account of a raw materials substitution cascade, as well as the stochasticity of demand, and other factors such as cost, service level and spatial requirements for the storage of stock. This combination of stochastic demand and product substitution has not, to the author’s knowledge, previously been dealt with in the literature. There are two primary deliverables of this study. The first is a suggestion as to the suitable stock composition (cardboard types from which boxes may be manufactured) to be kept in inventory at the factory. The second deliverable is a computerised decision–support system, based on the inventory model developed, to aid in future inventory replenishment decisions at Clickabox. Some of the results of this thesis have, at the time of writing, already been implemented with success at the factory. These include the suggestions given to the management of Clickabox as to the suitable stock types to be held in inventory, which have been implemented in stages since March 2003. The suggested stock composition has proven to be superior to the previous stock types held, in terms of a reduction in off–cut wastage and increased availability of suitable boards. / AFRIKAANSE OPSOMMING: Hierdie tesis is ’n gevallestudie in optimale voorraadbeheer, toegepas op Clickabox fabriek, ’n Suid–Afrikaanse kartondoosprodusent by wie kartondose op kort kennisgewing via die internet bestel kan word. In hierdie tesis word ’n besluitnemingsteunstelsel ontwikkel vir optimale bestuur van voorraad by die fabriek, wat karton afknipselvermorsing onderhewig aan vereiste diensvlakke minimeer. Vantevore is ’n eenvoudige voorraad aanvullingstrategie, wat hoofsaaklik op ondervinding gebaseer was, by die fabriek toegepas. ’n Wetenskaplike gefundeerde voorraadmodel word vir Clickabox ontwikkel en toegepas, waarin ’n rou–voorraad kaskade– substitusie proses in aanmerking geneem word, asook die stogastiese vraag na kartondose en faktore soos prys, diensvlakke en benodigde stoorruimte. Hierdie kombinasie van stogastiese vraag en rou–voorraad kaskade–substitusie is, tot die skrywer se kennis, nog nie in die literatuur behandel nie. Die studie het twee hoof–uitkomste ten doel. Die eerste is ’n aanbeveling ten opsigte van ’n geskikte rou–voorraad samestelling (kartontipes waaruit kartondose geproduseer kan word) wat by die fabriek in voorraad gehou moet word. Die tweede is ’n rekenaarmatige besluitnemingsteunstelsel, wat op die ontwikkelde voorraadbeheermodel gegrond is, en wat vir toekomstige besluite in verband met voorraadaanvulling by Clickabox bedoel is. Van die resultate wat in hierdie tesis vervat is, is reeds ten tyde van die opskryf daarvan doeltreffend by die fabriek ge¨ımplementeer. Ondermeer is die aanbeveling in verband met die geskikte voorraadsamestelling, geleidelik vanaf Maart 2003 by die fabriek ingefaseer. Dit het duidelik geword dat hierdie samestelling beter as die vorige voorraadprofiel funksioneer, in terme van ’n verlaging in afknipselvermorsing en ’n verhoging in die beskikbaarheid van geskikte kartonne.

Thesis (MPA)--Stellenbosch University, 2001. / ENGLISH ABSTRACT: Problems with stock control have arisen since the amalgamation of the four local governments in the Helderberg Basin. Management and control of stock are important as stock is considered as cash. It is therefore necessary that local governments pay attention to the continuous upgrading of existing systems for the purchase and storage of stock as well as the control of it and the facilities. The purpose of stock control is to ensure that the existing stock levels are sufficient to enable the local government to execute its functions effectively. This study points out that problems experienced are minimised and could even be eliminated by applying the JIT (Just-in-Time) principle. Statistics have shown that the JIT principle could be applied with great success within the Helderberg Municipality and that approximately R4,36m could be available for alternative application. For the Helderberg Administration JIT could mean minimising excess stock in such a way that mostly stock items with re-order times of eight weeks will have to be kept in stock. * Since 5 December 2000 the Helderberg Municipality is included in the City of Cape Town and is now known as Helderberg Administation. / AFRIKAANSE OPSOMMING: Ná amalgamasie van die vier munisipaliteite in die Helderbergkom word probleme met voorraadbestuur ondervind. Voorraadbestuur is belangrik omdat voorraad as kontant beskou word. Dit is daarom noodsaaklik dat munisipaliteite voortdurend aan die opknapping van bestaande stelsels van voorraadaankope en opberging, asook aan voorraadbeheer en fasiliteite aandag sal skenk. Die doel van voorraadbestuur is om te verseker dat die beskikbare voorraad voldoende is om die plaaslike owerheid in staat te stelom funksies effektief uit te voer. Hierdie navorsing dui daarop dat probleme wat ondervind word, verminder en selfs uitgeskakel sal kan word deur toepassing van die JIT(Just-in-Time)-beginsel. Statistiek dui daarop dat die JIT-beginsel met groot sukses binne die Helderberg Munisipaliteit toegepas sal kan word en ook bykans R4.36m. beskikbaar kan stel vir alternatiewe aanwending. Vir die Helderberg Administrasie kan JIT beteken dat oorbodige voorraad so geminimaliseer word dat meestal voorraaditems met herbesteltye van ag weke in voorraad gehou hoef te word. * Helderberg Munisipaliteit is vanaf 5 Desember 2000 deel van die Munisipaliteit van Stad Kaapstad en staan tans bekend as Helderberg Administrasie.