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The e-commerce turnover has a constant growth rate of about 10%. An additional increase
in complexity and traffic spikes clarify the need for a scalable software architecture to prevent
a potential technical debt, higher financial cost, longer maintenance, or a reduced reliability.
Due to the fact, that existing approaches like the Palladio Approach require a high modelling
overhead and the importance of dropping this overhead was identified this master thesis is
focused on the modelling and simulation of e-commerce web application architectures using
a high-level approach to provide a faster, but possibly more inaccurate prediction of the
scalability.
This is done by the usage of the Design Science Research Process as a frame, a scientific
literature review for use of the existing knowledge base and the Conical Methodology for the
artefact creation. The artefact is a graphical model which is evaluated using a simulation
developed with Python and its framework SimPy. For model creation and evaluation a total
of twelve papers investigating the scalability of e-commerce web application architectures is
split into a test and train group. The training group and parts of the scientific research are
used to identify the components load balancer, application server, web tier, ERP system,
legacy system and database as well as some general characteristics that need to be considered.
The components with the most modelling variables are the application server and web
tier with a total of thirteen, while the ERP and legacy system only required five.
The model is evaluated using a total of three papers from the test group, where an average
throughput error of 5.78% and a response time error of 46.55% or 26.46% was identified. An
additional evaluation based on two non-e-commerce architectures shows the usability of the
model for other types of architectures. Even though the average error gives the impression,
that the model is not providing a good estimation, the graphical results show, that the model
and its simulation can be used to provide a faster scalability prediction. The model is least
accurate for the prediction of the situation, where the response time increases exponentially,
as this is the point, where variables, only accountable for some percentage and thus ignored
for the model, have the highest influence.
Future research can be found in the extension of the model by either adding or investigating
additional components, adding features ignored within this work or applying it to other
types of web application architectures. Additionally, both the low-level and the high-level
approaches can be brought together to combine the advantages from both approaches.
Das Ziel dieser Bachelorarbeit war es, ein Programm zu entwickeln, welches die doppelte
Lichtbrechung und die Reflexion eines Laserstrahls berechnen kann. Hierbei wird zuerst auf
die physikalischen Grundlagen eingegangen. Anschließend wird das dazu verwendete Programm
mit dem Algorithmus inklusive den Berechnungen vorgestellt. Das Programm kann
die doppelte Lichtbrechung und auch die Reflexion eines Laserstrahls berechnen und zusätzlich
bestimmen, ob der Laserstrahl gebrochen oder total reflektiert wird. Die Prüfung dafür,
erfolgt über den Größenvergleich zwischen dem Einfallswinkel und dem kritischen Winkel.
Der Algorithmus ist für beliebige Laserstrahlen unter Berücksichtigung der Brechungsindexe
geeignet.
The aim of this master’s thesis is the design and implementation of a dedicated software system, for planning and implementation of occupational therapy intervention and research studies, in a driving simulator environment. In the first part, the concept based on user requirements is presented. It consists of architectural patterns and guidelines with the main focus on utility and application security. The result of this part is the design of a web application which supports integration in a clinical as well as a research environment. The second part presents the reference implementation of the previously introduced concept. It was developed under a case study in a research facility which hosts a driving simulator. A close cooperation and the influence the researcher’s experience led into a product which provides advanced usability for the target users. In conclusion, the thesis validated the concept indirectly under a testing phase of the reference implementation. It provides the base for a follow-up project to refine the software product and extend the concept to different fields of application.