TY  - THES
A1  - Geißler, Stefan
T1  - Performance Evaluation of Next-Generation Data Plane Architectures and their Components
T1  - Leistungsbewertung von Data Plane Architekturen der Nächsten Generation sowie ihrer Einzelkomponenten
N2  - In this doctoral thesis we cover the performance evaluation of next generation data plane architectures, comprised of complex software as well as programmable hardware components that allow fine granular configuration. In the scope of the thesis we propose mechanisms to monitor the performance of singular components and model key performance indicators of software based packet processing solutions. We present novel approaches towards network abstraction that allow the integration of heterogeneous data plane technologies into a singular network while maintaining total transparency between control and data plane. Finally, we investigate a full, complex system consisting of multiple software-based solutions and perform a detailed performance analysis. We employ simulative approaches to investigate overload control mechanisms that allow efficient operation under adversary conditions. The contributions of this work build the foundation for future research in the areas of network softwarization and network function virtualization.
N2  - Diese Doktorarbeit behandelt die Leistungsbewertung von Data Plane Architekturen der nächsten Generation, die aus komplexen Softwarelösungen sowie programmierbaren Hardwarekomponenten bestehen. Hierbei werden Mechanismen entwickelt, die es ermöglichen, die Leistungsfähigkeit einzelner Komponenten zu messen und zentrale Leistungsindikatoren softwarebasierter Systeme zur Verarbeitung von Datenpaketen zu modellieren. Es werden neuartige Ansätze zur Netzabstraktion entworfen, die eine vollständig transparente Integration heterogener Technologien im selben Netz ermöglichen. Schließlich wird eine umfassende Leistungsbewertung eines komplexen Systems, das aus einer Vielzahl softwarebasierter Netzfunktionen besteht, durchgeführt. Anhand simulativer Modelle werden Überlastkontrollmechanismen entwickelt, die es dem System erlauben auch unter Überlast effizient zu arbeiten. Die Beiträge dieser Arbeit bilden die Grundlage weiterer Forschungen im Bereich der Softwarisierung von Netzen sowie der Virtualisierung von Netzfunktionen.
T3  - Würzburger Beiträge zur Leistungsbewertung Verteilter Systeme - 02/21 
KW  - Leistungsbewertung
KW  - Simulation
KW  - Zeitdiskretes System
KW  - Implementierung <Informatik>
KW  - performance evaluation
KW  - simulation
KW  - discrete-time analysis
KW  - network softwarization
KW  - mobile networks
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-260157
SN  - 1432-8801
ER  - 
TY  - JOUR
A1  - Kiesel, Matthias
A1  - Beyers, Inga
A1  - Kalisz, Adam
A1  - Wöckel, Achim
A1  - Löb, Sanja
A1  - Schlaiss, Tanja
A1  - Wulff, Christine
A1  - Diessner, Joachim
T1  - Evaluating a novel 3D printed model for simulating Large Loop Excision of the Transformation Zone (LLETZ)
JF  - 3D Printing in Medicine
N2  - Background
Electrosurgical excisions are common procedures for treating cervical dysplasia and are often seen as minor surgeries. Yet, thorough training of this intervention is required, as there are considerable consequences of inadequate resections, e.g. preterm birth, the risk of recurrence, injuries and many more. Unfortunately, there is a lack of sufficiently validated possibilities of simulating electrosurgeries, which focus on high fidelity and patient safety.

Methods
A novel 3D printed simulator for examination and electrosurgical treatment of dysplastic areas of the cervix was compared with a conventional simulator. Sixty medical students experienced a seminar about cervical dysplasia. Group A underwent the seminar with the conventional and Group B with the novel simulator. After a theoretical introduction, the students were randomly assigned by picking a ticket from a box and went on to perform the hands-on training with their respective simulator. Each student first obtained colposcopic examination training. Then he or she performed five electrosurgical excisions (each). This was assessed with a validated score, to visualize their learning curve. Furthermore, adequate and inadequate resections and contacts between electrosurgical loop and vagina or speculum were counted. Both groups also assessed the seminar and their simulator with 18 questions (Likert-scales, 1–10, 1 = strongly agree / very good, 10 = strongly disagree / very bad). Group B additionally assessed the novel simulator with four questions (similar Likert-scales, 1–10).

Results
Nine of 18 questions showed statistically significant differences favoring Group B (p < 0.05). Group B also achieved more adequate R0-resections and less contacts between electrosurgical loop and vagina or speculum. The learning curves of the performed resections favored the novel simulator of Group B without statistically significant differences. The four questions focusing on certain aspects of the novel simulator indicate high appreciation of the students with a mean score of 1.6 points.

Conclusion
The presented novel simulator shows several advantages compared to the existing model. Thus, novice gynecologists can be supported with a higher quality of simulation to improve their training and thereby patient safety.
KW  - 3D printing
KW  - simulation
KW  - gynecology
KW  - Loop electrosurgical excision procedure (LEEP)
KW  - Large loop excision of the transformation zone (LLETZ)
KW  - teaching
KW  - education
KW  - patient safety
KW  - cervical dysplasia
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-313356
VL  - 8
ER  - 
TY  - JOUR
A1  - Schlund, Jonas
A1  - German, Reinhard
A1  - Pruckner, Marco
T1  - Synergy of unidirectional and bidirectional smart charging of electric vehicles for frequency containment reserve power provision
JF  - World Electric Vehicle Journal
N2  - Besides the integration of renewable energies, electric vehicles pose an additional challenge to modern power grids. However, electric vehicles can also be a flexibility source and contribute to the power system stability. Today, the power system still heavily relies on conventional technologies to stay stable. In order to operate a future power system based on renewable energies only, we need to understand the flexibility potential of assets such as electric vehicles and become able to use their flexibility. In this paper, we analyzed how vast amounts of coordinated charging processes can be used to provide frequency containment reserve power, one of the most important ancillary services for system stability. Therefore, we used an extensive simulation model of a virtual power plant of millions of electric vehicles. The model considers not only technical components but also the stochastic behavior of electric vehicle drivers based on real data. Our results show that, in 2030, electric vehicles have the potential to serve the whole frequency containment reserve power market in Germany. We differentiate between using unidirectional and bidirectional chargers. Bidirectional chargers have a larger potential but also result in unwanted battery degradation. Unidirectional chargers are more constrained in terms of flexibility, but do not lead to additional battery degradation. We conclude that using a mix of both can combine the advantages of both worlds. Thereby, average private cars can provide the service without any notable additional battery degradation and achieve yearly earnings between EUR 200 and EUR 500, depending on the volatile market prices. Commercial vehicles have an even higher potential, as the results increase with vehicle utilization and consumption.
KW  - smart charging
KW  - electric vehicles
KW  - simulation
KW  - ancillary services
KW  - smart grid
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-288324
SN  - 2032-6653
VL  - 13
IS  - 9
ER  -