Document Server@UHasselt
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Repository of the University of Hasselt containing publications in the fields of statistics, computer science, information strategies and material from the Institute for behavioural sciences.
Mostrando recursos 1 - 20 de 21
1.
Contributions to frailty and copula modelling with applications to clinical trials and dairy cows data - MASSONNET, Goele
In survival analysis the response of interest is the time from a well-defined time origin to the occurrence of a specific event. Some examples are the time from onset of a disease to death, the time from recovery to the time of recurrence of a disease, the time from purchase to breakdown of a machine. This response is called the survival time, the failure time or the event time. A special di±culty that often occurs in the analysis of survival data is the possibility that some responses are not observed for the full event time. Such incomplete observation of the...
2.
Studie van de waterige oplossinggel methode voor de bereiding van ferro-elektrisch lanthaan gesubstitueerd bismuttitanaat - HARDY, An
In this PhD research the synthesis of phase pure lanthanum substituted bismuth titanate (BLT) powders and the deposition of BLT thin films for application in non-volatile ferroelectric RAM has been investigated. The synthesis was carried out by means of several aqueous solution-gel routes, which have the advantage over alcoholic sol-gel of utilizing an inexpensive and safe solvent (H2O) and simple starting products. Furthermore, the aqueous precursors can be handled in ambient atmosphere, which simplifies the syntheses. An important objective of this research was to gain insight into the chemical mechanisms of all the different stages in this synthesis route, being...
3.
Non- and semi-parametric techniques for handling missing data - HENS, Niel
Missing data arise in various settings, including surveys, clinical trials and epidemiological studies. With
or without missing data, the goal of a statistical analysis is to make valid and efficient inferences about
a population of interest. The issue of missing values complicates this process. Early on, modelling
incomplete data relied on the use of parametric models. Recently, there is a general trend towards non-
and semi-parametric approaches to relax assumptions on which parametric models typically rely. Non-
and semi-parametric procedures in general will not be as efficient as model-based techniques when there
is a posited model, and the model is appropriate. However, if the assumed model...
4.
Compression Techniques for Massive Point Set Surfaces, with Application to Ray Tracing - HUBO, Erik
With the increasing capabilities of 3D data scanning devices, point set surfaces are
becoming increasingly popular. Even though using points sets already lessens storage
requirements (connectivity information is not stored), the ever increasing amount of
acquired geometric information gives rise to an equally growing demand for data
that needs a compact representation to be stored, transmitted, processed and rendered
efficiently....
6.
Een 2.5D Modelleer- en Animatieraamwerk ter Ondersteuning van Computer Geassisteerde Traditionele Animatie - DI FIORE, Fabian
Traditionally, 2D animation production has been a labour-intensive artisan
process of building up sequences of drawn images by hand which, when shown
one after the other at a fixed rate, resemble a movement. Most work and
hence time is spent on drawing, inking and colouring the individual animated
characters for each of the frames.
Existing computer assisted animation already has a huge impact on traditional
animation. However, the most time-consuming and labour-intensive
aspect in-betweening is not well enough computerised that it could
be (completely) performed by the computer and thus replacing traditional
animation. Moreover, there is also a legitimate concern that the extensive
computerisation will remove much of...
8.
The use of a fluorescence imaging system to study pre- and postharvest stress in fruit trees and apples - HUYBRECHTS, Christy
Although the developmental physiology of the Apple tree has been studied intensively, little research has been done on developing non-destructive techniques to study stress during the growing season. In an orchard it is necessary to detect problems (pre-harvest) early in the growing season in order to guarantee a good quality product with a good storage potential. The objective of this thesis was to investigate whether our portable chlorophyll fluorescence imaging system can be used to detect different types of stress during the pre- and postharvest period on apple trees.
The capability of the fluorescence imaging system to determine fruit maturity...
10.
Boards of directors in family firms: generational dynamics and the board's control and advisory tasks - BAMMENS, Yannick
The objective of this dissertation is to enhance the understanding of the boards
control and advisory tasks in a family firm context. For this purpose, a
generational life cycle and process approach are applied. The empirical results
indicate that the generational phase has a significant impact on board task
needs, board composition, and behavioral board processes. More specifically, the
need for board advice shows a convex generational trend and these advice
needs act as a mediator in the relationship between generation and the presence
of outside directors. Moreover, the need for board control increases over the
generations. However, contrary to our expectations, these control needs do not
act as...
12.
Wartezeiten an den Gerichten. Eine neo-institutionelle Theorie der Nachfrage nach gerichtlicher Konfliktsloesung - MUHL, Manuela
Diese Untersuchung zielt auf ein Verständnis der ökonomischen Auswirkungen von
Wartezeiten an den Gerichten auf die Nachfrage nach gerichtlicher Lösung privatrechtlicher,
d.h. bürgerlicher und handelsrechtlicher, Konflikte und daraus resultierender
Wohlfahrtseffekte ab. An vielen Gerichten dieser Welt kann man mehr oder weniger lange
Wartezeiten feststellen, denen die Konfliktparteien in einem Rechtsstreit entgegensehen. Das
Ausmaß der gerichtlichen Verzögerungen wird aus juristischer und politischer Sicht oftmals
als so ernst eingeschätzt, dass verschiedene Maßnahmen zur Begrenzung der Wartezeiten
getroffen werden. Jedoch sind die Zusammenhänge zwischen Reformen der Justiz zur
Eindämmung der Wartezeiten an den Gerichten und dem Verhalten der Individuen
insbesondere bei Entscheidungen, die die Nachfrage nach Gerichtsprozessen betreffen, noch
nicht hinreichend bekannt. Es...
20.
Dynamic Interactions for Networked Virtual Environments - JORISSEN, Pieter
The field of networked virtual environments has been an active area of research in the past decades. The increasing power of contemporary computers and the lowering of hardware and connectivity costs permits people to have this technology available in their homes and workplaces. As a result, several applications and prototypes are successfully being used in several fields. Most of the research and developments have, however, been technology driven and as a result one of the main components, interaction, is much less explored. In this dissertation we focus on realizing more realistic virtual experiences by narrowing the gap between real-life and...
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