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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

Simulation in Produktion und Materialfluss : entscheidungsorientierte Simulationsumgebung /

Noche, Bernd. January 1990 (has links)
Zugl.: Dortmund, Universiẗat, Diss., 1989.
2

Modellbasiertes Verfahren zur Online-Leistungsbewertung von automatisierten Transportsystemen in der Halbleiterfertigung

Sturm, Roland. January 2006 (has links)
Zugl.: Stuttgart, Univ., Diss., 2006. / Druckausg. bei Jost-Jetter, Heimsheim erschienen.
3

MRP zur Materialplanung für Kreislaufprozesse : Optimierung von Absicherungsstrategien gegen Bedarfs- und Versorgungsrisiken /

Gotzel, Christian. January 2010 (has links)
Zugl.: Magdeburg, Univ., Diss., 2008.
4

MRP zur Materialplanung für Kreislaufprozesse Optimierung von Absicherungsstrategien gegen Bedarfs- und Versorgungsrisiken

Gotzel, Christian January 2008 (has links)
Zugl.: Magdeburg, Univ., Diss., 2008
5

Performance analysis of flow lines with non-linear flow of material /

Helber, Stefan. January 1999 (has links)
Zugl.: Habil.schrift Univ. München. / Literaturverz.: S. 275-280.
6

Materialflußorientierte Termin- und Kapazitätsplanung : ein Konzept für Serienfertiger ; mit ... 5 Tabellen /

Treutlein, Klaus. January 1990 (has links)
Zugl.: Aachen, Techn. Hochsch., Diss. u.d.T.: Treutlein, Klaus: Entwicklung eines Konzeptes zur materialflußorientierten Termin- und Kapazitätsplanung bei variantenreicher Serienfertigung. / Zugl.: Aachen, Technische Hochsch., Diss. u.d.T.: Treutlein, Klaus: Entwicklung eines Konzeptes zur materialflußorientierten Termin- und Kapazitätsplanung bei variantenreicher Serienfertigung.
7

Optimisation of electric arc furnace dust recycling and zinc recovery by scrap de-zincing

Janjua, Rizwan Ahmed 24 July 2009 (has links) (PDF)
A considerable rise in the Electric Arc Furnace steelmaking has taken place in the EU during the last decade. As a result, the amount of steelmaking dust has increased as well. This dust is recycled in order to recover the valuable amount of zinc present in it. In contrast to the increase in dust generation, the capacity of recycling sites has not changed accordingly and there are growing concerns over this imbalance. In the present thesis, logistics and resource allocation of dust recycling in the EU are analysed. Data collected through a questionnaire survey was used to formulate the transportation model of linear programming. The results of the model highlight the location of gaps in recycling capacity and its uneven geographical distribution. The state of the recycling can be improved by research in scrap de-zincing; a process that can recover most of the zinc prior to steelmaking thereby lowering the total amount of dust. To this effect experiments were conducted using electro-galvanized scrap samples in order to study the kinetics of zinc evaporation. Various parameters such as the flow rate of carrier gas, scrap heating rate, packed bed voidage, permeability, and specific surface area were studied with a view of a possible scale-up of the process. The results show that there is a potential of integrating the de-zincing step into high temperature scrap pre-heating processes using shaft type systems that utilize off-gases of steelmaking and auxiliary burners.
8

The impact of decentral dispatching strategies on the performance of intralogistics transport systems

Klein, Nils 17 July 2014 (has links) (PDF)
This thesis focuses on control strategies for intralogistics transport systems. It evaluates how switching from central to decentral dispatching approaches influences the performance of these systems. Many ideas and prototypes for implementing decentral control have been suggested by the scientific community. But usually only the qualitative advantages of this new paradigm are stated. The impact on the performance is not quantified and analyzed. Additionally, decentral control is often confused with distributed algorithms or uses the aggregation of local to global information. In the case of the latter, the technological limitations due to the communication overhead are not considered. The decentral prototypes usually only focus on routing. This paper takes a step back and provides a generic simulation environment which can be used by other researchers to test and compare control strategies in the future. The test environment is used for developing four truly decentral dispatching strategies which work only based on local information. These strategies are compared to a central approach for controlling transportation systems. Input data from two real-world applications is used for a series of simulation experiments with three different layout complexities. Based on the simulation studies neither the central nor the decentral dispatching strategies show a universally superior performance. The results depend on the combination of input data set and layout scenario. The expected efficiency loss for the decentral approaches can be confirmed for stable input patterns. Regardless of the layout complexity the decentral strategies always need more vehicles to reach the performance level of the central control rule when these input characteristics are present. In the case of varying input data and high throughput the decentral strategies outperform the central approach in simple layouts. They require fewer vehicles and less vehicle movement to achieve the central performance. Layout simplicity makes the central dispatching strategy prone to undesired effects. The simple-minded decentral decision rules can achieve a better performance in this kind of environment. But only complex layouts are a relevant benchmark scenario for transferring decentral ideas to real-world applications. In such a scenario the decentral performance deteriorates while the layout-dependent influences on the central strategy become less relevant. This is true for both analyzed input data sets. Consequently, the decentral strategies require at least 36% to 53% more vehicles and 20% to 42% more vehicle movement to achieve the lowest central performance level. Therefore their usage can currently not be justified based on investment and operating costs. The characteristics of decentral systems limit their own performance. The restriction to local information leads to poor dispatching decisions which in return induce self-enforcing inefficiencies. In addition, the application of decentral strategies requires bigger storage location capacity. In several disturbance scenarios the decentral strategies perform fairly well and show their ability to adapt to changed environmental conditions. However, their performance after the disturbance remains in some cases unpredictable and relates to the properties of self-organizing complex systems. A real-world applicability has to be called into question.
9

Beitrag zur Prozessstandardisierung in der Intralogistik /

Figgener, Olaf. January 2008 (has links) (PDF)
Techn. Universiẗat, Diss.--Dortmund, 2007.
10

Einsatz von RFID zur Optimierung dezentraler Materialfluss-Steuerung ein Informationssystem zur Flexibilisierung der Reihenfolgeplanung in Kanban

Faupel, Titus January 2009 (has links)
Zugl.: Freiburg (Breisgau), Univ., Diss., 2009

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