Fak. 4 Elektrotechnik und Informatik

1473 Items

Recent Submissions
Impact of stochastic transmission effects on the design of digital back propagation

Goroshko, Kseniia (2020)

During the last three decades optical telecommunications industry is constantly pushing for new data transmission capacity limits. With a nowadays paradigm of coherent communication, one of the ways to increase the data rates is closely related to increasing the signal transmission power. That in turns allows reaching higher optical signal-to-noise ratio (OSNR). An intrinsic part of this soluti...

Impairment analysis and mitigation for cost-effective OFDM-based access systems

Duarte Sequeira André, Nuno Miguel (2020)

The growth in broadband connection speed has been exponential, and this trend will continue in the foreseeable future [1]. An access network is a connection between users and service providers and therefore a key element in support of this growth. While expanding its broadband offer a service provider must ensure seamless migration through compatibility with legacy networks, and also create an ...

Supporting domain modeling with automated knowledge acquisition and modeling recommendations

Agt-Rickauer, Henning (2020)

Domain modeling is an important model-driven engineering activity, which is typically used in the early stages of software projects. Domain models capture concepts and relationships of respective application fields using a modeling language and domain-specific terms. They are a key factor in achieving shared understanding of the problem area among stakeholders, improving communication in softwa...

Ad-Hoc stream query processing

Karimov, Jeyhun (2020)

Many modern applications require processing large amounts of data in a real-time fashion. As a result, distributed stream processing engines (SPEs) have gained significant attention as an important new class of big data processing systems. The central design principle of these SPEs is to handle queries that potentially run forever on data streams with a query-at-a-time model, i.e., each query i...

Fully integrated 240 GHz transmitter and receiver for high data rate communication

Eissa, Mohamed Hussein (2020)

The need for higher data rate wireless communication is increasing rapidly for different kind of applications. Hence the utilization of the wide and unallocated band above 200 GHz opens a lot of opportunities to serve these applications. This work presents the design, implementation and demonstration of fully integrated transmitter and receiver circuits for wireless communication at 240 GHz car...

Performance Counters based Power Modeling of Mobile GPUs using Deep Learning

Mammeri, Nadjib ; Neu, Markus ; Lal, Sohan ; Juurlink, Ben (2019-07-15)

GPUs have recently become important computational units on mobile devices, resulting in heterogeneous devices that can run a variety of parallel processing applications. While developing and optimizing such applications, estimating power consumption is of immense importance as energy efficiency has become the key design constraint to optimize for on these platforms. In this work, we apply deep ...

An Efficient Lightweight Framework for Porting Vision Algorithms on Embedded SoCs

Ashish, Apurv ; Lal, Sohan ; Juurlink, Ben (2019-09-10)

The recent advances in the field of embedded hardware and computer vision have made autonomous vehicles a tangible reality. The primary requirement of such an autonomous vehicle is an intelligent system that can process sensor inputs such as camera or lidar to have a perception of the surroundings. The vision algorithms are the core of a camera-based Advanced Driver Assistance Systems (ADAS). H...

Investigation of the Mechanical and Electrical Properties of Elastic Textile/Polymer Composites for Stretchable Electronics at Quasi-Static or Cyclic Mechanical Loads

Dils, Christian ; Werft, Lukas ; Walter, Hans ; Zwanzig, Michael ; Krshiwoblozki, Malte von ; Schneider-Ramelow, Martin (2019-11-01)

In the last decade, interest in stretchable electronic systems that can be bent or shaped three-dimensionally has increased. The application of these systems is that they differentiate between two states and derive there from the requirements for the materials used: once formed, but static or permanently flexible. For this purpose, new materials that exceed the limited mechanical properties of ...

EAGLE—A Scalable Query Processing Engine for Linked Sensor Data

Nguyen Mau Quoc, Hoan ; Serrano, Martin ; Mau Nguyen, Han ; G. Breslin, John ; Le-Phuoc, Danh (2019-10-09)

Recently, many approaches have been proposed to manage sensor data using semantic web technologies for effective heterogeneous data integration. However, our empirical observations revealed that these solutions primarily focused on semantic relationships and unfortunately paid less attention to spatio–temporal correlations. Most semantic approaches do not have spatio–temporal support. Some of t...

On the modeling and control of extended timed event graphs in dioids

Trunk, Johannes (2020)

Various kinds of manufacturing systems can be modeled and analyzed by Timed Event Graphs (TEGs). These TEGs are a particular class of timed Discrete Event Systems (DESs), whose dynamic behavior is characterized only by synchronization and saturation phenomena. A major advantage of TEGs over many other timed DES models is that their earliest behavior can be described by linear equations in some ...

Impact of light incidence on acute alertness

Broszio, Kai (2018-10-12)

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Virtual Network Embedding Approximations: Leveraging Randomized Rounding

Rost, Matthias ; Schmid, Stefan (2019-09-23)

The Virtual Network Embedding Problem (VNEP) captures the essence of many resource allocation problems. In the VNEP, customers request resources in the form of Virtual Networks. An embedding of a virtual network on a shared physical infrastructure is the joint mapping of (virtual) nodes to physical servers together with the mapping of (virtual) edges onto paths in the physical network connectin...

A Weighted SVM-Based Approach to Tree Species Classification at Individual Tree Crown Level Using LiDAR Data

Nguyen, Hoang Minh ; Demir, Begüm ; Dalponte, Michele (2019-12-09)

Tree species classification at individual tree crowns (ITCs) level, using remote-sensing data, requires the availability of a sufficient number of reliable reference samples (i.e., training samples) to be used in the learning phase of the classifier. The classification performance of the tree species is mainly affected by two main issues: (i) an imbalanced distribution of the tree species class...

A local measure of symmetry and orientation for individual spikes of grid cells

Weber, Simon Nikolaus ; Sprekeler, Henning (2019-02-07)

Grid cells have attracted broad attention because of their highly symmetric hexagonal firing patterns. Recently, research has shifted its focus from the global symmetry of grid cell activity to local distortions both in space and time, such as drifts in orientation, local defects of the hexagonal symmetry, and the decay and reappearance of grid patterns after changes in lighting condition. Here...

Learning place cells, grid cells and invariances with excitatory and inhibitory plasticity

Weber, Simon Nikolaus ; Sprekeler, Henning (2018-02-21)

Neurons in the hippocampus and adjacent brain areas show a large diversity in their tuning to location and head direction, and the underlying circuit mechanisms are not yet resolved. In particular, it is unclear why certain cell types are selective to one spatial variable, but invariant to another. For example, place cells are typically invariant to head direction. We propose that all observed ...

The mean point of vergence is biased under projection

Wang, Xi ; Holmqvist, Kenneth ; Alexa, Marc (2019-09-09)

The point of interest in three-dimensional space in eye tracking is often computed based on intersecting the lines of sight with geometry, or finding the point closest to the two lines of sight. We first start by theoretical analysis with synthetic simulations. We show that the mean point of vergence is generally biased for centrally symmetric errors and that the bias depends on the horizontal ...

A Comparative Study on the Influence of DC/DC-Converter Induced High Frequency Current Ripple on Lithium-Ion Batteries

Korth Pereira Ferraz, Pablo ; Kowal, Julia (2019-10-31)

Modern battery energy systems are key enablers of the conversion of our energy and mobility sector towards renewability. Most of the time, their batteries are connected to power electronics that induce high frequency current ripple on the batteries that could lead to reinforced battery ageing. This study investigates the influence of high frequency current ripple on the ageing of commercially a...

Laser-Microstructured Double-Sided Adhesive Tapes for Integration of a Disposable Biochip

Zamora, Vanessa ; Marx, Sebastian ; Arndt-Staufenbiel, Norbert ; Janeczka, Christian ; Havlik, George ; Queisser, Marco ; Schröder, Henning (2017-08-17)

Laser-microstructured double-sided biocompatible adhesive tapes as intermediated bonding layers are potential candidates for hybrid integration of a disposable biochip. In the EU-PHOCNOSIS project, such thin adhesive tapes are proposed to integrate the polymer microfluidic system with the optical sensor chip. Three laser-assisted structuring methods are investigated to efficiently transfer micr...

A Novel Low Cost Wireless Incontinence Sensor System (Screen-Printed Flexible Sensor System) for Wireless Urine Detection in Incontinence Materials

Ngo, Ha-Duong ; Hoang, Thanh Hai ; Baeuscher, Manuel ; Wang, Bei ; Mackowiak, Piotr ; Grabbert, Nils ; Weiland, Thomas ; Ehrmann, Oswin ; Lang, Klaus-Dieter ; Schneider-Ramelow, Martin ; Grudno, Jens (2018-12-21)

In this paper we present a printed, fast, high-sensitive and cheap wireless incontinence sensor system, which could be integrated in a common diaper for urinary detection. The system consists of a flexible screen-printed IDEs (Inter Digital Electrodes) sensor with bio compatible conducting PEDOT:PSS material, a battery, a readout electronics for sensor signal and a wireless module.

The Realization of Redistribution Layers for FOWLP by Inkjet Printing

Roshanghias, Ali ; Ma, Ying ; Dreissigacker, Marc ; Braun, Tanja ; Bretthauer, Christian ; Becker, Karl-Friedrich ; Schneider-Ramelow, Martin (2018-12-13)

The implementation of additive manufacturing technology (e.g., digital printing) to the electronic packaging segment has recently received increasing attention. In almost all types of Fan-out wafer level packaging (FOWLP), redistribution layers (RDLs) are formed by a combination of photolithography, sputtering and plating process. Alternatively, in this study, inkjet-printed RDLs were introduce...