The central thesis of this dissertation is that by combining classical scheduling methodologies with those of inventory management and queueing theory we can better model, understand and solve complex real-world scheduling problems. In part II of this dissertation, we provide models of a realistic supply chain scheduling problem that capture both its combinatorial nature and its dependence on inventory availability. We present an extensive empirical evaluation of how well implementations of these models in commercially available software solve the problem. We are therefore able to address, within a specific problem, the need for scheduling to take into account related decision-making processes. In order to simultaneously deal with combinatorial and dynamic properties of real scheduling problems, in part III we propose to integrate queueing theory and deterministic scheduling. Firstly, by reviewing the queueing theory literature that deals with dynamic resource allocation and sequencing and outlining numerous future work directions, we build a strong foundation for the investigation of the integration of queueing theory and scheduling. Subsequently, we demonstrate that integration can take place on three levels: conceptual, theoretical and algorithmic. At the conceptual level, we combine concepts, ideas and problem settings from the two areas, showing that such combinations provide insights into the trade-off between long-run and short-run objectives. Next, we show that theoretical integration of queueing and scheduling can lead to long-run performance guarantees for scheduling algorithms that have previously been proved only for queueing policies. In particular, we are the first to prove, in two flow shop environments, the stability of a scheduling method that is based on the traditional scheduling literature and utilizes processing time information to make sequencing decisions. Finally, to address the algorithmic level of integration, we present, in an extensive future work chapter, one general approach for creating hybrid queueing/scheduling algorithms. To our knowledge, this dissertation is the first work that builds a framework for integrating queueing theory and scheduling. Motivated by characteristics of real problems, this dissertation takes a step toward extending scheduling research beyond traditional assumptions and addressing more realistic scheduling problems.

L'objectif de cette recherche est de développer des modèles aussi bien conceptuels, analytiques et managériaux en analysant un maillon de la supply chain, à savoir la relation entre un distributeur et deux fournisseurs opérant dans un environnement incertain. Dans la première partie de la thèse, nous considérons un seul produit, plutôt haut de gamme et/ou périssable, et nous faisons l’analyse sur un horizon d’une période. Dans ce cas précis, les caractéristiques unitaires du produit sont toutes non linéaires, à savoir : le prix, le coût de production, le coût de rupture, le coût de reprise. La demande est supposée être une variable aléatoire. Dans la deuxième partie de la thèse, nous nous inspirons des pratiques de firmes internationales qui s’approvisionnent, pour une partie de leur offre, dans des pays à bas coûts. Nous développons plusieurs modèles mais dont la structure de base est similaire, à savoir : deux produits (un haut gamme acheté localement et l’autre bas de gamme acheté dans les pays à bas coûts), un horizon de trois périodes, deux fournisseurs à capacité de production limitée et un distributeur ayant des capacités de stockage limitées. Une panoplie de résultats théoriques, numériques ainsi que des insights sont présentés.Les modèles développés peuvent être utilisés comme des outils d’aide { la prise de décision dans les environnements décrits dans cette thèse / The objective of this research is to develop conceptual, analytical, and managerial models and insights by analyzing a portion of the supply chain made up of a retailer dealing with two suppliers in an uncertain environment. In the first part of this thesis, we consider a single high-end (or perishable) product, single period, variable unit price, variable unit production cost, variable unit shortage cost, variable unit salvagevalue, stochastic demand problem. In a second part of the thesis, we consider settings inspired by the case of large international companies sourcing some of their products from low cost countries. This structure is as follows: two products (one sourced locally and the other sourced abroad), a three-period, two-stages, two capacitated suppliers, and a single capacitated retailer. Both analytical and numerical results are provided. Important theoretical results and insights are developed for these types of settings. These models can be used as decision-making aid tools in such environments

This thesis deals with material management.in CzechPak manufacturing plant. The main aim of the thesis is to analyse the current situation of logistics at CzechPak Manufacturing and propose changes to ease material management. Further aim is to point out key materials and suppliers. The thesis introduces the plant targets and postion of logistic targets within the plant strategy. In this thesis food industry features are specified with regards to logistic processes. The thesis gives proposals for process and system changes in material management with taking advantages of SAP system. In this thesis ABC analysis is applied on materials in CzechPak Manufacturing to indicate key materials and propose supplies optimization.

No description available.

The purpose of the work is to develop recommendations for the improvement of methods and organization of enterprise logistics support system. The theoretical bases of the procurement activities of industrial enterprises were surveyed in this work; the practice of procurement management on the example of OJSC Sinara Pipe Plant was investigated; shortcomings and weak points in the theoretical, methodological and organizational framework of the logistics support were revealed; recommendations to improve the efficiency of supply by necessary materials and resources for enterprise were developed. Organizational and methodical ways to improve the enterprise logistics support system were proposed:  a way of improving the system of classification of resources on the most significant economic and technical characteristics and classification system for their storage were offered;  the changing of the supply department organizational structure was offered to improve its efficiency: the introduction of a new post of specialist in the nomenclature of used material resources to ensure uniqueness in the naming and classification of resources;  a method of suppliers rating was developed;  the technique of identifying illiquid stocks, reducing their level and to prevent further accumulation was developed. / Цель работы заключается в разработке рекомендаций по совершенствованию методов и организации обеспечения материально-технического снабжения предприятия. В работе раскрыты теоретические основы закупочной деятельности промышленного предприятия; исследована практика организации закупочной деятельности на примере ОАО СинТЗ; выявлены недостатки и проблемные места в теоретических, методических и организационных основах материально-технического обеспечения предприятия; разработаны рекомендации, направленные на повышение эффективности процесса снабжения предприятия необходимыми материалами и ресурсами. Предложены организационные и методические пути совершенствования системы снабжения предприятия:  предложен путь усовершенствования системы классификации ресурсов по наиболее значимым экономическим и техническим классификационным признакам и системы их складирования;  предложено изменение организационной структуры отдела снабжения для повышения эффективности его работы: введение новой должности специалиста по номенклатуре используемых материальных ресурсов с целью обеспечения однозначности в наименовании и классифицировании ресурсов;  разработана методика рейтинговой оценки поставщиков;  предложена методика выявления неликвидных запасов, снижения их уровня и предотвращения их дальнейшего накопления

The dairy industry is a complex system that involves many stakeholders and processes, from production to distribution. To measure and improve the performance of this system, a comprehensive and reliable Performance Measurement System (PMS) is needed. A PMS is a tool that helps to evaluate the efficiency and effectiveness of supply chain operations. One of the components of a PMS is the key performance indicators (KPIs), which reflect the performance of specific aspects of the supply chain. This thesis explores how KPIs can be used to enhance logistics performance in the dairy industry. The research is based on a single case study of a global company that operates in the dairy sector, which faces challenges such as high competition, customer demand variability, and food waste. The research uses a mix of literature review, interviews, and data analysis to identify and evaluate the relevant KPIs for logistics performance, as well as their interrelationships and impacts. The research applies the interpretive structural modeling (ISM) method to develop a hierarchical model of the KPIs and their causal relationships. The interpretive structural model of the indicators shows that the current indicators commonly used in the dairy industry today are not suitable for measuring performance, the indicators do not affect the current performance significantly but rather reflect the. This paper proposes a methodology for qualitatively evaluating performance measures, based on the integration of the ISM approach, the MICMAC analysis, and the seven criteria of a KPI. The ISM approach is a technique for identifying and analyzing the interrelationships among elements of a complex system. By applying this methodology, organizations and researchers can assess the suitability and importance of a set of KPIs. / Mejeriindustrin är ett komplext system som involverar många intressenter och processer, från produktion till distribution. För att mäta och förbättra systemets prestanda behövs ett heltäckande och tillförlitligt system för prestationsmätning (PMS). Ett PMS är ett verktyg som hjälper till att utvärdera effektiviteten i leveranskedjans verksamhet. En av komponenterna i ett PMS är nyckeltal (KPI:er), som är mått som återspeglar prestandan för specifika aspekter av leveranskedjan. Denna studie syftar till att undersöka hur KPI:er kan användas för att förbättra logistiken inom mejeriindustrin. Forskningen baseras på en fallstudie av ett globalt företag som är verksamt inom mejerisektorn, som står inför utmaningar som hög konkurrens, varierande kundefterfrågan och matsvinn. Forskningen använder en blandning av litteraturstudier, intervjuer och dataanalys för att identifiera och utvärdera relevanta KPI:er för logistikprestanda, samt deras inbördes relationer och påverkan. Forskningen tillämpar metoden ISM (Interpretive Structural Modeling) för att utveckla en hierarkisk modell av KPI:erna och deras orsakssamband. Den tolkande strukturella modellen av indikatorerna visar att de nuvarande indikatorerna som vanligtvis används i mejeriindustrin idag inte är lämpliga för att mäta prestanda, indikatorerna påverkar inte den nuvarande prestationen avsevärt utan återspeglar snarare resultaten. I denna rapport föreslås en metod för att utvärdera prestationsmått på ett kvalitativt sätt, baserat på integrationen av ISM-metoden, MICMAC-analysen och de sju kriterierna för en KPI. ISM-metoden är en teknik för att identifiera och analysera de inbördes relationerna mellan olika delar i ett komplext system. Genom att tillämpa denna metod kan organisationer och akademiker utvärdera lämpligheten och vikten av en uppsättning eller en KPI.

An increase in global supply chain disruption, such as the Covid-19 pandemic, has exposed vulnerabilities in supply chains. This has caused a reassessment of current supply chain management practices and highlighted a need for more resilient approaches. Despite an increased focus on this research area, Small and Medium-sized Enterprises (SMEs) are further challenged. Current practices are not well suited for these kinds of firms as they face resource and operational constrains. SMEs tend to build resilience through safety stocks, which provide a buffer against disruptions. However, maintaining inventories can be costly and inefficient. Furthermore, supply chain relationships have shown to enable collaborative efforts and increase visibility in the chain, thereby improving resilience. In light of this, the research focuses on exploring the effect of buyer-supplier relationships on SMEs resilience and how inventory management can align with SMEs efforts to build resilience. For this, a qualitative approach was employed, involving a case study of a manufacturing firm in Sweden. Data were collected through semi-structured interviews with six employees and seven direct suppliers, along with observations and archival data. The findings highlight the importance of long-term relationships in fostering supply chain resilience (SCR), emphasizing the need for transparent communication and collaboration. Therefore, a managerial framework is provided to guide the assessment of these relationships fostering the resilient benefits of supplier relationships. Additionally, the findings indicate the need for SMEs to balance inventory management practices with risk mitigation efforts like dual sourcing. The research concludes by outlining the benefits and risk associated with buyer-supplier relationships, emphasizing the importance of internal structures, and how inventory management practices can enhance SCR for SMEs. / En ökning av globala störningar, såsom Covid-19-pandemin, har avslöjat sårbarheter i försörjningskedjor. Detta har lett till en omvärdering av nuvarande metoder för hur försörjningskedjan ska hanteras och framhävt behovet av mer motståndskraftiga tillvägagångssätt. Trots ett ökat fokus på detta forskningsområde utmanas små och medelstora företag (SMEs) ytterligare. På grund av deras resurs- och verksamhetsbegränsningar är nuvarande metoder inte fullt tillämpliga. SMEs väljer ofta att bygga motståndskraft genom säkerhetslager eftersom detta utgör en buffert mot störningar. Att upprätthålla denna typ av lager kan dock vara kostsamt och ineffektivt. Vidare har det visat sig att relationer i försörjningskedjan möjliggör samarbeten och ökar synligheten, därigenom förbättrat försörjningskedjans motståndskraft. Mot denna bakgrund fokuserar studien på att utforska effekten av relationen mellan köpare och leverantör på SMEs motståndskraft, samt hur lagerhantering kan linjera med SMEs ansträngningar för att bygga motståndskraft. Studien genomfördes i form av en fallstudie hos ett tillverkande företag i Sverige och antog ett kvalitativt tillvägagångssätt. Data samlades in genom semistrukturerade intervjuer med sex anställda och sju direkta leverantörer, observationer och arkivdata. Resultatet understryker vikten av långsiktiga relationer för att främja motståndskraft i försörjningskedjan och betonar behovet av transparent kommunikation och samarbete. Av denna anledning tillhandahålls ett ramverk för att främja de motståndskraftiga fördelarna med leverantörsrelationer. Ramverket har sitt främsta syfte att vägleda utvärderingen av dessa relationer. Vidare visar resultaten att SMEs behöver balansera lagerhanteringsmetoder med riskreducerande insatser. Slutsatsen av denna studie beskriver fördelarna och riskerna förknippade med relationen mellan köpare och leverantör, vikten av interna strukturer och hur lagerhanteringsmetoder kan förbättra motståndskraften i försörjningskedjan för SMEs.

This diploma’s thesis deals with analysing the financial situation of LUX-IDent s.r.o. for the period of 2011 – 2015. The evaluation will use the methods and indicators of financial analysis. The proposed recommendations are based on the results of the financial analysis which will help improve the overall financial position and stability of the company.