Fak. 4 Elektrotechnik und Informatik

1237 Items

Recent Submissions
Analysis of coexisting graphical and textual representations of requirements based on activity diagrams and structured text

Beckmann, Martin (2019)

Due to increasing complexity and the tendency towards more customized products, the development of modern technical systems demands more and more effort. In an attempt to reduce the effort required, engineering models are being adopted to a greater extent in all phases of development. Among the affected development phases is requirements engineering. As a result, engineering models, which almos...

Realisierung eines piezo-resistiven Niederdruck-Sensors in der SOI-Technologie zum Einsatz in Hochtemperatur- und aggressiver Umgebung

Mukhopadhyay, Biswajit (2019)

Es besteht seitens der Automobil- und Kunststoffindustrie seit geraumer Zeit ein großer Bedarf an hochtemperaturtauglichen Drucksensorsystemen, welche z.B. im Motoreinlass und –auslass sowie RIM (Reaction Injection Moulding) eingesetzt werden können. Solche Hochtemperaturdrucksensoren können z.B. helfen, die Schadstoffemission und den Verbrauch von Verbrennungsmotoren zu reduzieren. Im Rahmen ...

One-class classification in the presence of point, collective, and contextual anomalies

Görnitz, Nico (2019)

Anomaly detection has a prominent position in the processing pipeline of any real-world data-driven application. Its central goal is to detect and separate valid data points from malicious-anomalous-ones such that the cleaned data set can be processed further. In many applications, anomalies are even the prime objects of interest and need to be exposed early in order to avoid loss, e.g. in cred...

Multi-Octave bandwidth, 100 W GaN power amplifier using planar transmission line transformer

Arnous, Mhd Tareq ; Zhang, Zihui ; Rautschke, Felix ; Böck, Georg (2017)

In this paper, design, implementation, and experimental results of efficient, high-power, and multi-octave gallium nitride-high electron mobility transistor power amplifier are presented. To overcome the low optima source/load impedances of a large transistor, various topologies of a broadside-coupled impedance transformer are simulated, implemented, and measured. The used transformer has a fla...

Electromagnetic and small-signal modeling of an encapsulated RF-MEMS switch for D-band applications

Tolunay Wipf, Selin ; Göritz, Alexander ; Wietstruck, Matthias ; Wipf, Christian ; Tillack, Bernd ; Mai, Andreas ; Kaynak, Mehmet (2017)

In this work, an electromagnetic (EM) model and a small-signal (lumped-element) model of a wafer-level encapsulated (WLE) radio frequency microelectromechanical systems (RF-MEMS) switch is presented. The EM model of the WLE RF-MEMS switch is developed to estimate its RF performance. After the fabrication of the switch, the EM model is used to get accurate S-parameter simulation results. Alterna...

Design and layout strategies for integrated frequency synthesizers with high spectral purity

Herzel, Frank ; Kissinger, Dietmar (2017)

Design guidelines for fractional-N phase-locked loops with a high spectral purity of the output signal are presented. Various causes for phase noise and spurious tones (spurs) in integer-N and fractional-N phase-locked loops (PLLs) are briefly described. These mechanisms include device noise, quantization noise folding, and noise coupling from charge pump (CP) and reference input buffer to the ...

SLC: Memory Access Granularity Aware Selective Lossy Compression for GPUs

Lal, Sohan ; Lucas, Jan ; Juurlink, Ben (2019)

Memory compression is a promising approach for reducing memory bandwidth requirements and increasing performance, however, memory compression techniques often result in a low effective compression ratio due to large memory access granularity (MAG) exhibited by GPUs. Our analysis of the distribution of compressed blocks shows that a significant percentage of blocks are compressed to a size that ...

Brain-Computer Interface - Motor Imagery Data

Blankertz, Benjamin ; Vidaurre, Carmen ; Sannelli, Claudia ; Kübler, Andrea ; Halder, Sebastian ; Hammer, Eva-Maria (2019-01)

We provide a data set of a BCI study using a motor imagery paradigm. In a calibration session, participants were instructed by cues to perform different types of imagined movements. The pair of classes resulting in the most promising discrimination was chosen and a classifier was trained. That classifier was used in the feedback session to let the participants move a cursor horizontally accordi...

Opening the machine learning black box with Layer-wise Relevance Propagation

Lapuschkin, Sebastian (2019)

Machine learning techniques such as (Deep) Neural Networks are successfully solving a plethora of tasks, e.g. in image recognition and text analysis, and provide novel predictive models for complex physical, biological and chemical systems. However, due to the nested complex and non-linear structure of many machine learning models, this comes with the disadvantage of them acting as a black box,...

Multi-path aware internet transport selection

Tiesel, Philipp S. (2019)

When the Internet experiment started more than 30 years ago, no one could foresee its expansion — What started as an experiment to interconnect a few research computers has become an essential global infrastructure of humanity. Originally, there was usually only one way to transport data between two computers; this has changed dramatically — today’s Internet offers us way more diverse transport...

Feedback-controlled functional electrical stimulation to restore upper extremity functions

Klauer, Christian (2019)

This thesis considers Neuro-prosthetic systems using Functional Electrical Stimulation (FES) to restore or support motor functions in neurologically impaired patients. An often encountered difficulty is the precise control of limb motion by adjusting the stimulation intensity. The musculoskeletal systems involving muscle mechanics, limb motion dynamics, and muscle recruitment due to FES and pos...

ISP traffic management via flow optimization

Akonjang, Emmanuel Obi (2019)

A major challenge that Internet Service Providers (ISPs) face today, is the growing traffic volume that they must handle. The situation becomes even more complex, as users' demands become more volatile or when new application trends emerge that fundamentally change traffic dynamics and composition. Thus, ISPs are always compelled to deal with such changes, in a proper, effcient, and timely ...

Web performance pitfalls data

Enghardt, Theresa (2019-03)

This dataset contains data from the experiment runs of the paper "Web Performance Pitfalls", published by Springer in the Conference Proceedings of the Passive and Active Measurement Conference 2019 (PAM 2019). It includes the load times, HAR files, and resource timing log files Web page loads. In total, the dataset consists of 50 experiment runs, each loading 1000 Web pages, using different br...

Chip Multiprocessor Traffic Models Providing Consistent Multicast and Spatial Distributions

Tutsch, Dietmar ; Lüdtke, Daniel (2008)

Chip multiprocessors (CMPs) have become the center of attention in recent years. They consist of multiple processor cores on a single chip. These cores are connected on-chip by a bus or, if many cores are involved, by an appropriate network. To investigate how a multicore processor behaves dependent on the chosen network-on-chip topology, a corresponding model must be established for performanc...

Application-level Simulation for Network Security

Schmidt, Stephan ; Bye, Rainer ; Chinnow, Joël ; Bsufka, Karsten ; Camtepe, Ahmet ; Albayrak, Sahin (2010)

NeSSi (network security simulator) is a novel network simulation tool which incorporates a variety of features relevant to network security distinguishing it from general-purpose network simulators. Its capabilities such as profile-based automated attack generation, traffic analysis and support for detection algorithm plug-ins allow it to be used for security research and evaluation purposes. N...

Activity and Eye Movement Analysis as Basis of Vehicle Cabin Design

Rötting, Matthias ; Rösler, Dirk ; Lohse, Katrin ; Göbel, Matthias (2000)

An inventory of different methods was developed over the last couple years to evaluate the ergonomic quality of different drivers workplaces. The cockpit of short-haul buses, long-haul buses, streetcars and harvesting machinery were evaluated. Based on this analysis criteria for the re-design could be developed. E.g. the design of the standard German short-haul buses is based on the results of ...

The photometry of hollow light guides

Rosemann, A. ; Kloss, S.-H. ; Müller, T. ; Aydinli, Sirri ; Kaase, Heinrich (2005)

Light-pipes described in this paper guide light along an axis allowing it to escape from its surface for illumination purposes. Light is coupled into them by a beamer luminaire. The performance of a hollow light guide very much depends on the quality of the materials used to guide the light. The luminous characteristics of these materials influence a light-pipe’s overall performance. The first ...

Modelling and control of a small-scale unmanned helicopter

Du, J. F. ; Kondak, K. ; Zhang, Y. O. ; Lu, T. S. (2008)

The dynamical model of a toy helicopter considered as two rigid bodies is deduced using Kane's equation. Another model is presented that considers the helicopter as a single rigid body. It is shown that the response of the rotational dynamics modelled as two rigid bodies is cosine while that modelled as one rigid body is linear. In addition, a flight controller is presented that is based on dyn...

Data and container placement in scalable data analytics platforms

Renner, Thomas (2018)

Distributed dataflow systems process large volume of data in parallel on multiple machines. In production, multiple dataflow applications are scheduled for execution in virtual containers on a per-job basis. Furthermore, they access datasets partitioned into datablocks across the cluster machines' disks. Runtime performance is important for many of these jobs, as their users expect fast results...

Experimental investigation of GaN power devices

Badawi, Nasser (2018)

Over the next decade, the power electronics will require a new generation of semiconductor devices that are smaller, cheaper and more efficient. Technology changes will radically influence the power electronics business in different industries, including the automotive, renewable energy, motion and rail industry. The key features of highly efficient power converters comprise high switching perf...