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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The application of system dynamics and discrete event simulation in supply chain management of Swedish manufacturing industries

Ahmadi, Mansour January 2012 (has links)
Increasing competition from traditional and emerging channels has placed new emphasis on rapid innovation and continuous differentiation in every aspect of supply chain, from earliest production stage to the final distribution steps. To bridge the gap between brilliant ideas and successful business initiatives, leading companies implement engineering simulation particularly in logistics and supply chain management (LSCM). Discrete event simulation (DES) and system dynamics (SD) are two modeling approaches widely used in this field. However there are not much done researches about the applications of these simulation approaches in supply chain context of Swedish Manufacturing Industries (SMI). This study explores the application of DES and SD in LSCM of SMI by looking at the nature and level of issues modeled. Journal papers and master theses that use these modeling approaches to study supply chains, published between 1990 and 2012 are reviewed. A total of 39 articles are analyzed to identify the frequency with which the two simulation approaches are used as modeling tools in LSCM of SMI. Our findings suggest that DES has been used more frequently to model supply chains in SMI. The results also show that not all the LSCM issues have been addressed evenly and generally tactical/operational issues have been modeled more frequently. The results of this study inform the existing literature about the use of DES and SD in LSCM of SMI.
2

Lean implementering hos svenska industrier : En empirisk studie av implementering för interna Lean dimensioner

Jonsson, Amanda, Lindquist, Pawitchaya January 2020 (has links)
Lean production originates from the Toyota production system (TPS) and is commonly known as today's Lean. Lean Production consists of a multitude of concepts, values, principles and methods with the main purpose to continuously improve operations and productions. These concepts are known to improve long-term profitability.   The purpose was to investigate Swedish industries and their relation to internal Lean strategies and how well implemented these are in different types of industries. These are categorised as Other, Process- Manufacturing and engineering industry. In this study, the main focus is on analyzing dimensions of internal Lean production in industrial types. These dimensions are Pull System (PULL), Continuous Flow (FLOW), Time Reduction (SETUP), Statistical Process Control (SPC), Employee Involvement (EMP.INVOLV) and Total Productive Maintenance (TPM). These internal Lean dimensions derive from an empirical study by Shah & Ward (2007), with the aim to produce a deeper knowledge of the definition of Internal Lean production.   The study is based on empirical evidence and the data analysis is established from a previous data collection of the European manufacturing Survey (EMS) for Sweden in 2019, previously developed by Von Haartman, Niss & Bengtsson (2020). The used data is descriptive statistics and is limited to Swedish industries. In this study, the analysis will focus on 24 Lean questions and 6 internal Lean dimensions have been investigated and analyzed.    It is concluded, based on results and analysis, that two Lean perspectives are the basis for businesses to achieve Lean in production. In order to succeed in implementing Lean production, it is important that these perspectives interact with each other. By implementing practical methods, tools and at the same time allowing employees to be involved in the work, quality and efficiency are increased. This contributes to businesses creating improvements in production-related functions in production.   To a large extent the Swedish industries have a Low or Medium use of internal Lean dimensions. TPM is found to be the most commonly implemented dimension for most individual industry types while the dimensions SPC and EMP.INVOLV has the lowest implementation. For individual industry types, there is no major variance in how they answered the implementation of dimensions. All dimensions have a correlation without significant differences for all types of industries. It is found, implementation of dimension PULL differ from each type of industry and Engineering industry have implemented internal Lean dimensions to a higher extent. / Lean produktion härstammar från Toyota production system (TPS) och är grunden till det dem flesta känner till idag som Lean. Lean Produktion omfattar många begrepp som innebär värderingar, principer och metoder där huvudsyftet är att ständigt förbättra produktionen i verksamheten för att bidra till långsiktig lönsamhet.    Syftet var att undersöka hur svenska industrier förhåller sig till interna Lean strategier och hur välanvänt det är inom olika industrityper. Dessa är fördelade som Övrigt, Process-, Tillverkning och Verkstadsindustri. Denna studie fokuserar på att analysera dimensioner av intern Lean produktion hos industrityper. Dessa dimensioner är dragande system (PULL), kontinuerligt flöde (FLOW), Ställtidsreduktion (SETUP), Statistisk processtyrning (SPC), Medarbetarnas involvering (EMP.INVOLV) och Totalt produktivt underhåll (TPM). Dessa interna Lean dimensioner härstammar från en empiriska studie av Shah & Ward (2007), med syftet att skapa en djupare förståelse för definitionen av intern Lean produktion.   Studien baseras på empiriska belägg och grundas utifrån en tidigare datainsamling från European manufacturing Survey (EMS) för Sverige år 2019, tidigare framtagen av Von Haartman, Niss & Bengtsson (2020). Datan som används är deskriptiv statistik och avgränsas till Svenska industrier. I denna studie kommer endast 24 frågor och 6 interna Lean dimensioner att undersökas och analyseras.    Slutsatsen är att det finns två Lean perspektiv som är grunden till att verksamheten uppnår Lean i produktion. För att lyckas med implementering av Lean produktion är det viktigt att dessa perspektiv samspelar med varandra. Genom att implementera praktiska metoder, verktyg och samtidigt tillåta medarbetarna involveras i arbetet ökar kvaliteten och effektiviteten. Detta bidrar till att verksamheter skapar förbättring av tillverknings relaterade funktioner i produktionen.   Samtliga industrier i undersökningen har i utsträckning en Låg eller Medelhög användning av interna Lean dimensioner. TPM är den mest använda dimensionen hos de flesta enskilda industrityperna medan dimensionerna SPC och EMP.INVOLV har lägst användning. För enskilda industrityper finns det ingen större varians i hur de har besvarat användningen för dimensioner. Alla dimensioner har ett samband i korrelationer utan signifikanta skillnader för samtliga industrityper. Det konstateras, att implementering av dimension PULL skiljer sig från varje typ av industri och Verkstadsindustri har implementerat interna Lean dimensioner i högre utsträckning.

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