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In recent years, much research has been done on medical laser applications inside the human body, as they are minimally invasive and therefore have fewer side effects and are less expensive than conventional therapies. In order to bring the laser light into the human body, a glass fibre with a diffuser is needed. The goal of this master thesis is the characterization and production of fibre optic diffusers that can be used for the three therapeutic applications: photodynamic therapy, laser-induced thermotherapy and endovenous laser therapy. For this purpose the following goals have to be achieved:
- Optimization of the efficiency and homogeneity of internally structured diffusers
- Examine damage thresholds of the diffusers in the tissue using a crash test
- Achieving a better understanding of the decouple mechanism with a simulation
Using an ultra-short pulse laser, modifications could be introduced into the fibre in this way that the radiation profile is homogeneous and the decoupling efficiency is 68.3 %. It was discovered that the radiation profile depends on the wavelength. Attempts have been made to improve the decoupling efficiency by mirroring the distal end of the fibre. The mirror reflects the remaining light back into the fibre, so that it is also decoupled lateral on the modifications. Vapor-deposited aluminum with physical vapor deposition is a promising approach. However, the adhesion of the coating must be improved or the coating must be protected by a mechanical cover, otherwise it will flake off too quickly.
In a crash test, it was shown that the glass fibre diffusers can withstand 20 W laser power for 300 s without visible change. In an ex vivo test, the coagulation zone in the tissue was examined and it was showed that the diffusers radiate radially homogeneously. Using a ray trace simulation, the course of the light rays in the fibre was examined and the correlation of modification width and length with the decoupling efficiency was investigated. It was discovered that there are helical light rays in the fibre, which cannot be decoupled by modifications in the fibre centre.
Die vorliegende Masterarbeit enthält neue Erkenntnisse in Bezug auf die Frage, ob die Änderung einer Analystenempfehlung für Aktien neue Informationen enthält und ein Anleger eine abnormale Rendite erzielen kann. Darüber hinaus wird untersucht, ob in Phasen des konjunkturellen Abschwungs eine höhere abnormale Rendite im Vergleich zu einem konjunkturellen Aufschwung ausgewiesen wird. Die Ergebnisse zeigen, dass Aktienkurse signifikant positiv auf Kaufempfehlungen und signifikant negativ auf Verkaufsempfehlungen reagieren. Zusätzlich wird belegt, dass eine höhere und zeitlich längere Reaktion auf eine Verkaufsempfehlung gegenüber einer Kaufempfehlung stattfindet. Es wird außerdem festgestellt, dass auch bei isolierter Betrachtung der Konjunkturzyklen (Aufschwung und Abschwung) eine abnormale Rendite erzielt wird. Zudem verzeichnen negative Veränderungen der Analystenempfehlungen eine höhere abnormale Rendite als jene bei positiven Veränderungen.
Diese Arbeit resultiert in einem Leitfaden, der zur verbesserten Wirksamkeit von Lernmaßnahmen in Organisationen beitragen soll. Inbesondere die Verkürzung der Halbwertszeit von Wissen gab Anlass zur vorliegenden Untersuchung. In den Kapiteln zwei und drei wurde das theoretische Fundament durch Bearbeitung der Themen Personal-/Kompetenzentwicklung, allgemeine und individuelle Lerntheorie, sowie Lernbedarfsanalyse, Lerntransfer und Lernevaluation gebildet. Darauf aufbauend wurde mit der Methodik (Kapitel 4) der Experteninterviews der aktuelle Stand definierter Organisationen im Raum Ostschweiz, Westösterreich und Liechtenstein hinsichtlich Lernbedarfsanalyse, Lerntransfer und Lernevaluation erhoben. Diese Ergebnisse wurden in Kapitel 5 mit der Literaturstudie aus Kapitel 2 und 3 verglichen. Der Leitfaden besteht für Lernbedarfsanalyse, Lerntransfer und Lernevaluation aus unterschiedlichen Schritten, die in Tabellenformat dargestellt und beschrieben sind (Kapitel 6). In Kapitel 7 wurden, neben einer Zusammenfassung und einem Fazit, weiterführende Forschungsansätze zur Thematik angeführt.
A novel calorimetric technique for the analysis of gas-releasing endothermic dissociation reactions
(2020)
The present research had compared how Uppsala and Bartlett & Ghoshal (B&G) models explain the internationalization process of the Brazilian pulp producer Fibria.
The Uppsala model describes the developments of capabilities that enable the firm to move towards higher commitments abroad. Despite its sine-qua-non dependence on foreign markets, it is unlikely that Fibria will internationalize its production to another country, given the country-specific advantages that the company has in Brazil. Nevertheless, Fibria set its structure abroad even when the direct exports would suffice to reach the markets without any foreign direct investment.
B&G deals with the aspects of the organizational structure and described the Transnational type as the evolution of the international firm. In their typology, Fibria was a Global and Ethnocentric type, but interestingly, elements of Transnational and Geocentric models were also observed in the company.
Both theories overlap or complement each other in many aspects. However, they could not explain the peculiarities of the internationalization of Fibria. One reason is the lack of country-related elements in these models.
Eventually, comparisons between theories such as those presented enable decision-makers to align the corporate strategy using suitable models, bearing in mind the limitations that each method entails.
Graphite substrates underwent two methods of creating doped silicon carbide films via carbothermal reduction; the first method being liquid-phase processing, or dip-coating, and the second gas-phase processing, otherwise referred to as the solid-vapour reaction. The dip-coating procedure resulted in flaky coatings, while the solid-vapour reaction resulted in polycrystalline films with columnar growth that displayed promising morphological and electrical properties. The films were tested on their performance as semiconductor diodes, and proved that carbothermal reduction in the gas phase is a promising technique for creating polycrystalline silicon carbide films for the application of light-emitting diodes.
Das Management eines Unternehmens kann Mithilfe von bilanzpolitischen Maßnahmen bewusst Einfluss auf das Unternehmensergebnis nehmen. Durch Ausnutzung von Ermessenspielräumen bei der Bildung und Auflösung von Rückstellungen können stille Reserven gebildet und in späteren Perioden wieder aufgelöst werden.
In dieser Masterarbeit wurde untersucht ob die Unternehmen des M-DAX mithilfe der Big-Bath-Accounting-Methode oder der Income-Smoothing-Methode bewusst Einfluss auf das Jahresergebnis genommen haben. Hierfür wurden die Geschäftsberichte der Zielgruppe im Zeitraum von 2009 – 2018 empirisch untersucht. Um die Gültigkeit der Hypothesen zu überprüfen wurde das ausgewiesene EBIT mit einem bereinigten EBIT verglichen. Für die Ermittlung des bereinigten EBITs wurden die tatsächlichen Rückstellungsbildungen bzw. Rückstellungsauflösungen durch die über den Betrachtungszeitraum durchschnittlichen Rückstellungsbildung bzw. Rückstellungsauflösung ersetzt.
Die Ergebnisse der empirischen Untersuchung haben gezeigt, dass die Unternehmen der Zielgruppe Mithilfe von Rückstellungen großen Einfluss auf das EBIT nehmen können. Weiter konnte belegt werden, dass die meisten Unternehmen bei der Rückstellungsbewertung grundsätzlich vorsichtig agieren und höhere Beträge in Rückstellungen bilanzieren.
The boom of information technology development created high demand for skilled labour force in IT occupations. IT professionals install, test, build, repair or maintain hardware and software and can do the job from any location in the world.
Demand for the workforce significantly outstrips the global supply. In a situation of staff shortage employers have to compete on local and global labour markets. The ability of a firm to attract and retain the best talent would become a source of its sustainable competitive advantage.
Aim of the study is to understand what influences perception of employment attractiveness by IT professionals the most. This study intends to expend the existing knowledge about employees´ needs and “psychological contract” concept.
The research was conducted with the participation of 4 IT and 4 HR English-speaking experts who live and work in Austria. In the study the grounded theory approach and the descriptive qualitative methods were applied.
The research findings explain which factors influence the decision of IT professionals to join, stay or leave an employer. The results are discussed in relation to talent attraction and retention practices of Austrian employers.
Increasing international competition and accelerated technological change characterize the environment in which companies must maintain and, if possible, expand their competitive advantage. In this context, the new, popular keyword innovation management is often mentioned. Many corporations propagate and use it for marketing purposes. As a result, the companies have to evaluate, develop and launch innovations increasingly faster, which poses great challenges for many and requires a high degree of adaptability.
This master thesis analyzes innovation management (IM) in the automotive industry and in other industries (material manufacturers, service providers, medicine, ...) depending on the number of employees and turnover. In addition, the maturity levels of the IMs and the innovation management systems (IMS) are examined. It also tries to determine which design or "building blocks" are necessary for a successful innovation management. Furthermore, factual and monetary guidelines by the management are evaluated. The thesis also aims to find out how the success of IM is measured. Therefore, guideline-based expert interviews were conducted with responsible people from the innovation departments and then systematically analyzed.
In the literature, expenses for innovations are often wrongly equated with the R&D rate. In this master thesis, it could be shown that this ratio is highest in the automotive industry. However, it does not correlate with the number of employees, turnover, maturity level, success or design of the IM. Furthermore, it could be shown that larger companies have a higher degree of maturity. The reason for this is that more people are usually involved in innovation and that a holistic understanding of innovation is better anchored in large corporations. When designing the IM or the roles of the innovation department, large companies use several different types. While the IM departments in small and medium-sized companies are usually incubators and accelerators, large companies also use corporate venture capital to support start-ups and develop new business models. In this thesis, the success of IM was determined by the number of innovations implemented in customer projects. It was found that, regardless of the size of the company, a higher degree of maturity of the IM and the accelerator role seem to have a positive influence.
Unfortunately, there are rarely concrete goals and targets set by the management although these, along with a holistic understanding of innovation in the company, are without doubt the most important part of a successful innovation management.
This thesis aims to support the product development process. Therefore, an approach is developed, implemented as a prototype and evaluated, for automated solution space exploration of formally predefined design automation tasks holding the product knowledge of engineers. For this reason, a classification of product development tasks related to the representation of the mathematical model is evaluated based on the parameters defined in this thesis. In a second step, the mathematical model should be solved. A Solver is identified able to handle the given problem class.
Due to the context of this work, System Modelling Language (SysML) is chosen for the product knowledge formalisation. In the next step the given SysML model has to be translated into an object-oriented model. This translation is implemented by extracting information of a ".xml"-file using the XML Metadata Interchanging (XMI) standard. The information contained in the file is structured using the Unified Modelling Language (UML) profile for SysML. Afterwards a mathematical model in MiniZinc language is generated. MiniZinc is a mathematical modelling language interpretable by many different Solvers. The generated mathematical model is classified related to the Variable Type and Linearity of the Constraints and Objective of the generated mathematical model. The output is stored in a ".txt"-file.
To evaluate the functionality of the prototype, time consumption of the different performed procedures is measured. This data shows that models containing Continuous Variables need a longer time to be classified and optimised. Another observation shows that the transformation into an object-oriented model and the translation of this model into a mathematical representation are dependent on the number of SysML model elements. Using MiniZinc resulted in the restriction that models which use non-linear functions and Boolean Expressions cannot be solved. This is because the implementation of non-linear Solvers at MiniZinc is still in the development phase. An investigation of the optimally of the results, provided by the Solvers, was left for further work.