Criticality in the Abelian sandpile model

In this thesis we study criticality in the context of the dissipative Abelian sandpile model. The model is linked to a simple trapped random walk, giving a practical method to determine criticality for certain landscapes of dissipative sites. The main results concern the lifetime of the random walk, especially the divergence of its first moment...

Identifying and improving the internal and external information exchange for shipbuilding processes

To identify and improve the communication or information flow for a ship production process, this thesis provides an approach to use a Discrete Event Simulation (DES) model, based on Petri Net technique. By establishing a theoretical framework, the different simulation modelling options are analysed and based on practical requirements, a choice...

Comparison of Power-to-X-to-Power technologies for energy storage in 2030

The energy transition is advancing rapidly, and the Dutch electricity grid is changing with it. Increasing shares of variable renewable energy sources create mismatches between electricity supply and demand. These mismatches create a need for large-scale energy storage. Existing large-scale energy storage technologies are pumped hydro energy...

Optimizing the design and development of thick film heaters for consumer products

Ferro Techniek specializes in the use of enameling techniques in heating elements for consumer and industrial applications. They distinguish themself by delivering customized sub-assemblies for consumer products in the form of Thick Film Heaters (TFHs). These TFHs are used in several consumer products like Nespresso machines, food processors,...

Analysis and Optimization of a Machined Steel Kit Manufacturing Process

IHC Metalix, a producer of machined steel kits for the shipbuilding industry, is currently in the process of improving production efficiency by modifying an existing crane as well as by installing two additional cranes, a pallet conveyor, and a pallet storage rack. The exact effects of these improvements on the production process have not been...

Experiences with process interaction based simulation in education and research

Feasibility study of CO2 capture by anti-sublimation

Processes for carbon capture and storage have the drawback of high energy demand. In this work the application of CO2 capture by anti-sublimation is analyzed. The process was simulated using Aspen Plus. Process description is accomplished by phase equilibria models which are able to reproduce the vapor-liquid and vapor-solid equilibria....

Event-based progression detection strategies using scanning laser polarimetry images of the human retina

Monitoring glaucoma patients and ensuring optimal treatment requires accurate and precise detection of progression. Many glaucomatous progression detection strategies may be formulated for Scanning Laser Polarimetry (SLP) data of the local nerve fiber thickness. In this paper, several strategies, all based on repeated GDx VCC SLP measurements,...

Formal analysis of design process dynamics

This paper presents a formal analysis of design process dynamics. Such a formal analysis is a prerequisite to come to a formal theory of design and for the development of automated support for the dynamics of design processes. The analysis was geared toward the identification of dynamic design properties at different levels of aggregation. This...

Controlling enigneering-to-order processes in shipbuilding, a model-based approach

Engineering-to-Order processes in shipbuilding are characterised by their results: unique ships built on customer specification. A challenge is the control of such processes: the combination of complex technical solutions, a large quantity of specialist engineers of different parties, highly interrelated âconcurrentâ tasks, continuous exchange...

Adaptive motion compensation in sonar array processing

In recent years, sonar performance has mainly improved via a significant increase in array ap-erture, signal bandwidth and computational power. This thesis aims at improving sonar array processing techniques based on these three steps forward. In applications such as anti-submarine warfare and mine hunting motion of the sonar needs to be...

A step forward in the theory and practice of ICT management simulation

The popularity of animated simulation as a tool for modeling and analyzing business processes is growing. This is due to the fact that it offers a number of benefits for modeling such processes, among which the ability to capture their stochastic character, represent the changes in their characteristics in the course of time and model and...

Nucleus-based product conceptualization - Part 2. Application in designing for use

when products are being designed, especially in conceptual design where there is a multitude of options for the designer. This paper presents a methodology to generate resource-integrated models unifying representations of the product, the user and the environment based on nucleus modelling, which is presented in Part 1 of this paper, according...

Three Dimensional Simulation of Fabric Draping