Fak. 4 Elektrotechnik und Informatik

1339 Items

Recent Submissions
Automated Anomaly Detection in Virtualized Services Using Deep Packet Inspection

Wallschläger, Marcel ; Gulenko, Anton ; Schmidt, Florian ; Kao, Odej ; Liu, Feng (2017)

Virtualization technologies have proven to be important drivers for the fast and cost-efficient development and deployment of services. While the benefits are tremendous, there are many challenges to be faced when developing or porting services to virtualized infrastructure. Especially critical applications like Virtualized Network Functions must meet high requirements in terms of reliability a...

STEAM: A Platform for Scalable Spatiotemporal Analytics

Deva, Bersant ; Raschke, Philip ; Rodriguez Garzon, Sandro ; Küpper, Axel (2017)

Spatiotemporal datasets have become increasingly available with the introduction of a various set of applications and services trac- ing the behavior of moving objects. Recently, there has been a high demand in understanding these datasets using spatiotemporal analytics. While being considered of high value, spatiotemporal analytics did not yet see a wide spreading into the actual business work...

Robust motion generation for mobile manipulation — integrating control and planning under uncertainty

Sieverling, Arne (2019)

This thesis contributes to algorithmic approaches for the motion generation problem for mobile manipulators. This problem is unsolved in unstructured environments, where the robot does not have access to precise models but must infer the state of the world with its sensors. The challenges for motion generation in these problems arise from the uncertainty prevalent in real world sensors, the dif...

Scalable and efficient distributed self-healing with self-optimization features in fixed IP networks

Tcholtchev, Nikolay (2019)

The Internet is continuously gaining importance in our society. Indeed, the Internet is slowly turning into the backbone of the modern world, having impact on all possible aspects, such as politics, communication, intercultural exchange, and emergency services, to give some examples. As these aspects are developing, the technical infrastructure around the Internet’s core protocol - IP (Internet...

Remote-Laser-Lichtquelle für ein hochaufgelöstes Scheinwerfersystem

Hansen, Julien (2019)

Der Bauraum im automobilen Scheinwerfer ist stark begrenzt. Daher wäre eine Entkopplung und Zentralisierung der Lichtquelleneinheit vorteilhaft. Ziel der vorliegenden Arbeit ist es, die Eigenschaften von Laserstrahlung zu nutzen, um eine effiziente Entkopplung der Lichtquelle vom hochaufgelösten Scheinwerfersystem mit Hilfe von Glasfasertechnologie zu realisieren. Für die Umsetzung dieser Remot...

Digital Appendix for the Dissertation 'Conception and Evaluation of E-Learning Units regarding Motivation and Acquired Competencies for Theoretical Computer Science at University Level'

Wilhelm-Weidner, Arno (2019-09-10)

This submission contains research data and analysis results of a dissertation. For this dissertation, studies were conducted in six university courses where e-learning units were used as a supplement. The aim of this research approach was mainly to find out more about the influences of the approach on motivation and competencies of the participating students.

Design and Fabrication of a BiCMOS Dielectric Sensor for Viscosity Measurements: A Possible Solution for Early Detection of COPD

Soltani Zarrin, Pouya ; Jamal, Farabi Ibne ; Guha, Subhajit ; Wessel, Jan ; Kissinger, Dietmar ; Wenger, Christian (2018-08-21)

The viscosity variation of sputum is a common symptom of the progression of Chronic Obstructive Pulmonary Disease (COPD). Since the hydration of the sputum defines its viscosity level, dielectric sensors could be used for the characterization of sputum samples collected from patients for early diagnosis of COPD. In this work, a CMOS-based dielectric sensor for the real-time monitoring of sputum...

Exploiting SAR Tomography for Supervised Land-Cover Classification

D’Hondt, Olivier ; Hänsch, Ronny ; Wagener, Nicolas ; Hellwich, Olaf (2018-11-05)

In this paper, we provide the first in-depth evaluation of exploiting Tomographic Synthetic Aperture Radar (TomoSAR) for the task of supervised land-cover classification. Our main contribution is the design of specific TomoSAR features to reach this objective. In particular, we show that classification based on TomoSAR significantly outperforms PolSAR data provided relevant features are extract...

Design and Application of a High-G Piezoresistive Acceleration Sensor for High-Impact Application

Hu, Xiaodong ; Mackowiak, Piotr ; Bäuscher, Manuel ; Ehrmann, Oswin ; Lang, Klaus-Dieter ; Schneider-Ramelow, Martin ; Linke, Stefan ; Ngo, Ha-Duong (2018-05-28)

In this paper, we present our work developing a family of silicon-on-insulator (SOI)–based high-g micro-electro-mechanical systems (MEMS) piezoresistive sensors for measurement of accelerations up to 60,000 g. This paper presents the design, simulation, and manufacturing stages. The high-acceleration sensor is realized with one double-clamped beam carrying one transversal and one longitudinal p...

Ein Beitrag zur thermischen Auslegung von Stromrichterventilen mit zweiseitig gekühlten Halbleiterbauelementen

Schwarz, Jürgen (1986)

Ein Beitrag zur thermischen Auslegung von Stromrichterventilen mit zwei seitig gekühlten Halbleiterbauelementen. Konventionelle Verfahren zur thermischen Dimensionierung von Stromrichterventilen mit zweiseitig gekühlten Halbleiterbauelementen berücksichtigen die unterschiedlichen thermischen Verhältnisse auf der Anoden- und der Kathodenseite nicht. Werden solche Halbleiterbauelemente mit Kühlei...

Capsule Networks for Object Detection in UAV Imagery

Mekhalfi, Mohamed Lamine ; Bejiga, Mesay Belete ; Soresina, Davide ; Melgani, Farid ; Demir, Begüm (2019-07-17)

Recent advances in Convolutional Neural Networks (CNNs) have attracted great attention in remote sensing due to their high capability to model high-level semantic content of Remote Sensing (RS) images. However, CNNs do not explicitly retain the relative position of objects in an image and, thus, the effectiveness of the obtained features is limited in the framework of the complex object detecti...

Classification of PolSAR Images by Stacked Random Forests

Hänsch, Ronny ; Hellwich, Olaf (2018-02-23)

This paper proposes the use of Stacked Random Forests (SRF) for the classification of Polarimetric Synthetic Aperture Radar images. SRF apply several Random Forest instances in a sequence where each individual uses the class estimate of its predecessor as an additional feature. To this aim, the internal node tests are designed to work not only directly on the complex-valued image data, but also...

Robot grasping by exploiting compliance and environmental constraints

Eppner, Clemens (2019)

Grasping is a crucial skill for any autonomous system that needs to alter the physical world. The complexity of robot grasping stems from the fact that any solution comprises various components: Hand design, control, perception, and planning all affect the success of a grasp. Apart from picking solutions in well-defined industrial scenarios, general grasping in unstructured environment is still...

Prognosenerstellung im Rahmen von Revisionsprojekten an Großgeneratoren zur Bestimmung derer Lebensdauer durch Auswertung ereignisbasierter Wartungsmaßnahmen unter Berücksichtigung von Befunden und Monitoring-Systemen

Urban, Sascha (2019)

Gegenstand der Dissertation ist die Prognosenerstellung im Rahmen von Revisionsprojekten an Großgeneratoren zur Bestimmung derer Lebensdauer durch Auswertung ergebnisbasierter Wartungsmaßnahmen unter Berücksichtigung von Befunden und Monitoring-Systemen. Die verwendete Datenbasis wurde von der Firma EMIS Electrics GmbH zur Verfügung gestellt. Ziel der Arbeit ist es, durch die Erstellung einer...

A Novel Framework for a Systematic Integration of Pneumatic-Muscle-Actuator-Driven Joints into Robotic Systems Via a Torque Control Interface

Martens, Mirco ; Seel, Thomas ; Zawatzki, Johannes ; Boblan, Ivo (2018-11-28)

In this paper, two different torque control approaches for PMA-driven (PMA = Pneumatic muscle actuator) revolute joints are presented and tested. In previous work controllers for PMA-driven robots are typically customized for the use on a specific robotic system. In contrast, the proposed controllers define a general control interface for every robot that is actuated by PMA-driven joints. It wi...

Secure and Reliable Key Agreement with Physical Unclonable Functions

Günlü, Onur ; Kernetzky, Tasnad ; İşcan, Onurcan ; Sidorenko, Vladimir ; Kramer, Gerhard ; Schaefer, Rafael (2018-05-03)

Different transforms used in binding a secret key to correlated physical-identifier outputs are compared. Decorrelation efficiency is the metric used to determine transforms that give highly-uncorrelated outputs. Scalar quantizers are applied to transform outputs to extract uniformly distributed bit sequences to which secret keys are bound. A set of transforms that perform well in terms of the ...

Using Semantic Web Technologies to Query and Manage Information within Federated Cyber-Infrastructures

Willner, Alexander ; Giatili, Mary ; Grosso, Paola ; Papagianni, Chrysa ; Morsey, Mohamed ; Baldin, Ilya (2017-06-23)

A standardized descriptive ontology supports efficient querying and manipulation of data from heterogeneous sources across boundaries of distributed infrastructures, particularly in federated environments. In this article, we present the Open-Multinet (OMN) set of ontologies, which were designed specifically for this purpose as well as to support management of life-cycles of infrastructure reso...

Safety Aspects, Tolerability and Modeling of Retinofugal Alternating Current Stimulation

Haberbosch, Linus ; Datta, Abhishek ; Thomas, Chris ; Jooß, Andreas ; Köhn, Arvid ; Rönnefarth, Maria ; Scholz, Michael ; Brandt, Stephan A. ; Schmidt, Sein (2019-08-07)

Background While alternating current stimulation (ACS) is gaining relevance as a tool in research and approaching clinical applications, its mechanisms of action remain unclear. A review by Schutter and colleagues argues for a retinal origin of transcranial ACS’ neuromodulatory effects. Interestingly, there is an alternative application form of ACS specifically targeting α-oscillations in the ...

Efficient Algorithms for Coded Multicasting in Heterogeneous Caching Networks

Vettigli, Giuseppe ; Ji, Mingyue ; Shanmugam, Karthikeyan ; Llorca, Jaime ; Tulino, Antonia M. ; Caire, Giuseppe (2019-03-25)

Coded multicasting has been shown to be a promising approach to significantly improve the performance of content delivery networks with multiple caches downstream of a common multicast link. However, the schemes that have been shown to achieve order-optimal performance require content items to be partitioned into several packets that grows exponentially with the number of caches, leading to cod...

Untersuchung des temperatur- und feldstärkeabhängigen Raumladungsverhaltens an einer Schichtanordnung aus Silikonfett und Silikonelastomer mittels automatisierter LIPP-Messungen

Spelzhausen, Simon (2019)

Mit dem momentanen Ausbau des Übertragungsnetzes durch Gleichspannungs-Erdkabel in Deutschland ergeben sich neue technische Herausforderungen, da es zur Ausbildung von Raumladungen in den Kabelgarnituren kommen kann, wobei hier vor allem die dielektrischen Grenzflächen eine Gefahr für die Betriebssicherheit darstellen. Für ein besseres Verständnis des Raumladungsverhaltens ist die Durchführun...