Detta examensarbete har ägt rum vid Produktionsverkstad 1 (PV1) på Wexiödisk AB där diskmaskiner av huvtyp tillverkas. Syftet med detta examensarbete har varit att undersöka vilka lagerstyrningsmodeller som är lämpliga för att styra avdelningens materialflöden med. Arbetet har genomförts i två steg. Först behandlades artiklar unika för produkterna vid PV1, därefter artiklar gemensamma med andra produkter. Enligt modeller ur relevant litteratur utformades förslag på hur dessa kunde appliceras praktiskt. Förslagen presenterades och diskuterades med berörd personal som valde Tvåbingesystem 2. Ett test gjordes enligt principen ”den japanska sjön” vilket innebar lägre lagernivåer i lastbärarna. De problem som uppstod noterades. Resultatet blev att antalet artiklar som plockades i veckosatser minskades vilket skapat underlag för att minska administrationen av tillhörande plocklistor. Plockvagnen har kunnat tas bort vilket frigjort yta vid monteringsavdelningen. Förutsättningar finns att slå samman två plocklistor till en och därmed förenkla arbetet för förrådspersonalen. / This degree project has been performed at Production unit 1 (PV1) at Wexiödisk AB, where hood type washing machines is manufactured. The purpose of this project has been to investigate which inventory control models that could be suitable to control the section’s material supplies. The work has been accomplished in two steps. At first, items unique to products manufactured at PV1 were treated, followed by items common with other products. According models in relevant literature, suggestions were made to how the models could be applied practically. The suggestions was presented to and discussed with the parties concerned who chose Two-bin system 2. A trial was carried out according to the principle of “the Japanese river” which implied lowered inventory levels. The problems that occurred were noted. The result was that the number of items that was weekly picked and distributed was reduced which has created a basis to also reduce the administration of the systems picking lists. The item wagon has been removed which has cleared floor space at the assembly section. Conditions have been created to merge two picking lists into one and thereby simplify the work for the inventory staff.

This paper presents the feasibility study of setting up the new potting tray production line based on the two alternatives: partly outsource a process in the production line or wholly make all processes in-house. Both the qualitative and quantitative approaches have been exploited to analyze and compare between the make or buy decision. Also the nature of business, particularly SMEs, in Thailand has been presented, in which it has certain characteristics that influence the business doing and decision, especially to the supply chain management. The literature relating to the forecasting techniques, outsourcing decision framework, inventory management, and investment analysis have been reviewed and applied with the empirical findings. As this production line has not yet been in place, monthly sales volumes are forecasted within the five years time frame. Based on the forecasted sales volume, simulations are implemented to distribute the probability and project a certain demand required for each month. The projected demand is used as a baseline to determine required safety stock of materials, inventory cost, time between production runs and resources utilization for each option. Finally, in the quantitative analysis, the five years forecasted sales volume is used as a framework and several decision making-techniques such as break-even analysis, cash flow and decision trees are employed to come up with the results in financial aspects.

Personlighetsfaktorerna har betydelse för hur mycket risker individer tar. Syftet med denna studie är att undersöka om det finns ett samband mellan personlighetsfaktorerna enligt femfaktormodellen och graden av generell riskbenägenhet. Mycket av tidigare forskning har kopplat personlighet till domänspecifikt risktagande som hälsa, ekonomi och arbete, medan denna studie undersöker kopplingen till generell riskbenägenhet i vardagen vilket kan vara att välja ett okänt resmål eller att söka till en ny universitetsutbildning. 189 undersökningsdeltagare i olika åldrar och från olika yrkesgrupper besvarade en enkät bestående av två olika tester, den svenska versionen av the Big Five Inventory (BFI) och en svensk översättning av the Risk Propensity Scale (RPS). Resultatet visar på ett signifikant samband mellan fyra av de fem personlighetsfaktorerna enligt femfaktormodellen och en ökad riskbenägenhet, nämligen Öppenhet, Samvetsgrannhet, Utåtriktning och Vänlighet. Däremot fanns ingen signifikant korrelation mellan personlighetsfaktorn Neuroticism och riskbenägenhet.

Introduction: Nowadays firms must focus on maintaining healthy finished goods inventory stocks in order to be able to decrease inventory costs, meet customer requirements and to obtain competitive advantage. However large decentralized manufacturing companies often face the problem of sub-optimization in inventory management in subsidiaries due to several different reasons. As a result, company loses its competitiveness. Thus, there is a need to coordinate inventory activities of subsidiaries to prevent sub-optimization. Purpose: The purpose of this thesis is to investigate whether coordination mechanisms highlighted in academic literature are used in practice on the example of manufacturing company with decentralized decision-making structure for optimization finished goods inventory stocks. Frame of reference: This research is based on theoretical framework and empirical findings. Empirical data were collected through personal interviews and retrieved from organisational documents. Methodology: The research strategy for this paper is a single case study. This strategy allows investigating topic in its real life context. The deductive approach is used for this research based on qualitative data. The major source of data collection was semi-structured interviews and the company's documents. For analysing data categorisation approach was applied. Conclusion: The study found that most of coordination mechanisms presented in scientific literature are used in practice. To achieve better results these mechanisms should be applied simultaneously and consistently since they complement each other. We also observed that coordination mechanisms indeed give positive results and are able to optimize inventory management.

In many firms the pricing and inventory control functions are separated. However, a number of theoretical models suggest a joint determination of inventory levels and prices, as prices also affect stocking risks. In this work, we address the problem of simultaneously determining a pricing and inventory replenishment strategy under reference price effects. This reference price effect models the empirically well established fact that consumers not only react sensitively to the current price, but also to deviations from a reference price formed on the basis of past purchases. The current price is then perceived as a discount or surcharge relative to this reference price. Thus, immediate effects of price reductions on profits have to be weighted against the resulting losses in future periods. We study how the additional dynamics of the consumers' willingness to pay affect an optimal pricing and inventory control model and whether a simple policy such as a base-stock-list-price policy holds in such a setting. For a one-period planning horizon we analytically prove the optimality of a base-stock-list-price policy with respect to the reference price under general conditions. We then extend this result to the two-period time horizon for the linear and loss-neutral demand function and to the multi-period case under even more restrictive assumptions. However, numerical simulations suggest that a base-stock-list-price policy is also optimal for the multi-period setting under more general conditions. We furthermore show by numerical investigations that the presence of reference price effects decreases the incentive for price discounts to deal with overstocked situations. Moreover, we find that the potential benefits from simultaneously determining optimal prices and stocking quantities compared to a sequential procedure can increase considerably, when reference price effects are included in the model. This makes an integration of pricing and inventory control with reference price effects by all means worth the effort. (author's abstract)

Hybrid Make-To-Stock (MTS)-Make-To-Order (MTO) manufacturing is a well known policy that captures the benefits of both MTS and MTO policies. This manufacturing policy is adopted by many manufacturing firms because it allows for production based on customer specifications while keeping short response times. We study a hybrid MTS-MTO manufacturing system which consists of two processing stages and an intermediate buffer between these two stages. We propose two separate scenarios for ordering and replenishment of components from the first stage which will give more realistic guidance for practitioners. The first scenario is batching customer orders before being released to the first stage. The second scenario is batch replenishment of common components from the first stage. Most existing MTS-MTO models focus on one-for-one ordering and replenishment strategies. We enhance these models by introducing a batch ordering policy to account for economies of scale in ordering when there is an ordering cost associated with each order placed for common components. We use queueing theory to model the system behavior and use the matrix-geometric method to evaluate system performance under the new ordering policy. Afterwards, we develop an optimization model with the objective to minimize the system overall costs. The purpose of our optimization model is to find the optimal intermediate buffer size and the optimal order quantity for the system. In the second scenario, we introduce the batch replenishment policy from stage 1. This policy is suitable when stage 1 and stage 2 are physically distant and there is a shipping cost incurred when components are transferred from stage 1 to stage 2. The decision variables in this model are the intermediate buffer size and the shipping quantity. We show that the base stock policy is sub-optimal when there is an ordering cost incurred for ordering components. The savings from adopting the batch ordering policy are high and the response time for most customer orders is not affected. When there are shipping costs and shipping time between the two stages, we show that the right selection of the system decision variables can have a large impact on the total cost incurred by the system.

Practical inventory settings often include multiple generations of the same product on hand. New products often arrive before old stock is exhausted, but most inventory models do not account for this. Such a setting gives rise to the possibility of inter-generational substitution between products. We study a retailer that stocks two product generations and we show that from a cost perspective the retailer is better off stocking only one generation. We proceed with a profit scheme and develop a price-setting profit maximization model, proving that in one and two generation profit models there exists a unique solution. We use the profit model to show that there are cases where it is more profitable to stock two generations. We discuss utility and preference extensions to the profit model and present the general n-product case.

No description available.

The study aims at investigating how revenue management techniques can be applied in industries which offer multiple products. Most of the companies nowadays trend to produce multiperoducts and they try to find the best method of selling. Therefore, revenue management can be considered as a new direction which should be developed for these firms. In this study, multi-product firms are mainly referred as firms offering a bundle of products or substitute products. In this regard, models and techniques applied in multiproduct firms are discussed and it is tried to provide basic models to better understand the problems, variables, customer choice models and constraints. The main methodology in this study is literature review. In order to carry out the research first revenue management applications and techniques are discussed to find a fit to this kind of industries. The main findings of this study are (1) identifying and analyzing the most important factors affecting decision making regarding managing of bundling and substitute products and ultimately total revenue of multiproduct firms. (2) Summarizing the results and knowledge obtained from various studies within fields of bundling and substitute products. (3) Discussing the possibility of applying different revenue management techniques to these fields. (4) Identifying potentials and new directions for future study with respect to both revenue management techniques and multiproduct firms.

Bakgrund: Den logistiska kedjan från producent till konsument blir alltmer komplex på grund av att ett ständigt ökande antal artiklar tillverkas utifrån kundens behov och önskemål. För att kunna tillgodose dessa behov och önskemål har företag historiskt sett haft stora lager. VMI tar problemet med att hantera och utveckla effektiva lager till en ny nivå. Att arbeta med VMI innebär stora fördelar för många olika företag när det gäller informationsspridning, partnerskap och lagerföring. Trots de omfattande fördelar som beskrivs i de flesta teorier om VMI finns det en del framförd kritik. I och med detta ligger det i vårt intresse att undersöka huruvida företag som arbetar med ett VMI-system upplever de teoretiska effekterna och om det finns effekter av VMI-samarbeten som teorin inte beskriver. Problemformulering: Vilka effekter, angående de logistiska aktiviteterna, innebär ett VMI-samarbete i en dyad inom tillverkningsindustrin och hur stämmer de överens med de effekter teorin beskriver? Metod: Genom att använda fallstudien som forskningsmetod, har vi undersökt vårt problem. Vidare har vi använt oss av ett kvalitativt tillvägagångssätt vid datainsamlingen. De undersökta företagen har valts ut genom ett icke-sannolikhetsurval och när vi har dragit våra slutsatser har vi utgått från en deduktiv ansats. Teori: Vi har byggt vår teori på fyra huvudområden/logistiska aktiviteter, leveransservice, logistikkostnader, produktion och lagerhållning. Vidare har vi beskrivit hur områdena påverkas positivt såväl som negativt av VMI. Empiri: Vår empiriska undersökning har genomförts i två dyader, inom tillverkningsindustrin, som använder eller har använt sig av VMI. Vi har undersökt hur företagen har upplevt/upplever samarbetet och vilka effekter de har erfarit/erfar inom de fyra logistiska aktiviteterna. Resultat: Resultatet har vi grundat på en jämförelse mellan vår teoretiska och empiriska undersökning. Vi har här kommit fram till att de positiva effekterna, som teorin beskriver, i större utsträckning stämmer överens med vad företag inom tillverkningsindustrin upplever än de negativa effekterna. Hur väl effekterna överensstämmer skiljer sig åt mellan de olika logistiska aktiviteterna.