Fak. 4 Elektrotechnik und Informatik

1283 Items

Recent Submissions
Efficient Bayesian Inference of Sigmoidal Gaussian Cox Processes

Donner, Christian ; Opper, Manfred (2018)

We present an approximate Bayesian inference approach for estimating the intensity of a inhomogeneous Poisson process, where the intensity function is modelled using a Gaussian process (GP) prior via a sigmoid link function. Augmenting the model using a latent marked Poisson process and Polya--Gamma random variables we obtain a representation of the likelihood which is conjugate to the GP prior...

Quantifizierung der räumlichen Lichtverteilung

Liedtke, Carolin (2019)

Diese Dissertation stellt ein neues Modell zur Quantifizierung der räumlichen Lichtverteilung vor. Aufgrund fehlender Eignung von etablierten Beschreibungsgrößen in der aktuellen Lichtplanungspraxis entsteht ein neues Beschreibungsmodell, um die Lichtverteilung im Raum hinsichtlich der Lichteinfallsrichtung und ihrer Diffusität besser zu beschreiben. Zur Überprüfung dieses neuen Modells werden ...

Investigation of perovskite-CIGSe tandem solar cells

Wang, Yajie (2019)

Multi-junction photovoltaic devices have received much attention for a long time due to their potential performance beyond the Shockley-Queisser (S-Q) limit compared with the current (commercially available) single junction solar cells. Thin film solar cells based on polycrystalline Cu(In,Ga)(S,Se)2 (CIGSe) absorbers and hybrid organic-inorganic perovskite solar cells have reached power convers...

CIE Test Cases — Bewertung der Genauigkeit von softwarebasierter Lichtberechnung

Liedtke, Carolin (2014-02-05)

Validation of the light simulation software Dialux and Relux shows an overall good accuracy according to the CIE Test Cases (Technical Report 171:2006). However, data reveal also limitations of the test procedure, provided reference data, and validity of tested aspects.

Advanced EEG signal processing with applications in brain-computer interfaces

Nicolae, Irina-Emilia (2019)

Advances in signal processing push forward the Neurotechnology domain along with the Brain-Computer Interface (BCI) research which deals with the analysis of brain activity. Heading for a future that will most probably happen, where either healthy persons or people with disabilities communicate and control external devices without muscle control, a symbiotic relationship between humans and mach...

Bayesian inference of inhomogeneous point process models

Donner, Christian (2019)

Arrival times of airplanes, positions of car accidents or astronomical objects in space, locations of ecological crisis, spike times of neurons, etc. are all data that surround us and can be viewed as realisations of point processes. Nowadays, the modelling of these data becomes increasingly more important, when we attempt to draw meaningful conclusions from this ever expanding amount of data. ...

Modelling and integrating personality as affective phenomenon in agent-based systems

Ahrndt, Sebastian (2019)

A team member's ability to predict the actions of other team members influences the efficiency of teamwork. This is named predictability and one of the challenges associated with the task of making agents team player in joint human-agent activities. I approach this problem focusing on personality as a predictor of human behaviour and following a combination of theory and data-driven approaches...

Requirements Quality Is Quality in Use

Femmer, Henning ; Vogelsang, Andreas (2019)

The quality of requirements engineering artifacts is widely considered a success factor for software projects. Currently, the definition of high-quality or good RE artifacts is often provided through normative references, such as quality standards, textbooks, or generic guidelines. We see various problems of such normative references: (1) It is hard to ensure that the contained rules are comple...

Compiling Modelica

Höger, Christoph (2019)

The equation-based object-oriented modeling language Modelica is an openly accessible standard with many implementations and applications. Most, if not all, tools that execute a Modelica simulation follow a common scheme: Models are loaded, composed, analyzed, and transformed into a system of equations. This system is then further simplified, translated into efficient code, and simulated....

Development and evaluation of a simulation-based adaptive shading control for complex fenestration systems

Katsifaraki, Angelina (2019)

The necessity of solar control for the fenestration systems of commercial buildings has been extensively discussed over the past decades bringing forward issues such as energy efficiency, visual and thermal comfort, privacy, visual contact to the outside and aesthetics. However, a number of problems arising from manual control has been identified pointing towards the direction of automatized sy...

Optical feedback effects within 1.55 μm InP-based DFB laser integrated Mach-Zehnder modulators for up to 100 GBd data transmission

Lange, Sophie Gloria (2019)

Indium phosphide-based 1550 nm wavelength optical transmitters are developed, suitable for next generation transceiver modules for intra- and inter-data center connections from a few kilometers to tens of kilometers range. The challenges of designing high-speed, low power and low-cost transceivers for future data centers are met by integrating a high bandwidth and low switching voltage travelli...

A Response to the United Nations CITES Blockchain Challenge: Incremental and Integrative PoA-based Permit Exchange - Demo Video

Busse, Anselm ; Eberhardt, Jacob ; Frost, Sebastian ; Kim, Dong-Ha ; Weilbier, Thore ; Renner, Lukas ; Roth, Matthias ; Tai, Stefan (2019)

This video is referenced by the paper "A Response to the United Nations CITES Blockchain Challenge: Incremental and Integrative PoA-based Permit Exchange". See the abstract of the paper below: The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) negotiated and administered by the United Nations Environment Programme (UNEP) regulates the international tr...

Optimizing the depth and the direction of prospective planning using information values

Sezener, Can Eren ; Dezfouli, Amir ; Keramati, Mehdi (2019-03-12)

Evaluating the future consequences of actions is achievable by simulating a mental search tree into the future. Expanding deep trees, however, is computationally taxing. Therefore, machines and humans use a plan-until-habit scheme that simulates the environment up to a limited depth and then exploits habitual values as proxies for consequences that may arise in the future. Two outstanding quest...

Entwicklung eines Information-Retrieval-Systems zur Unterstützung von Gefährdungs- und Risikoanalysen

Hartig, Kerstin (2019)

Die Entwicklung sicherheitsbezogener Systeme im Automobilbereich unterliegt speziellen Anforderungen an die funktionale Sicherheit, die in der Norm ISO 26262 beschrieben sind. Um die funktionale Sicherheit zu gewährleisten, werden zu Beginn der Systementwicklung Gefährdungs- und Risikoanalysen (G&Rs) erstellt. In G&Rs werden mögliche Fehlfunktionen in verschiedenen Betriebssituationen untersuch...

Features and machine learning systems for structured and sequential data

Schwenk, Guido (2019)

Modern web and communication technology relies heavily on sequential and structured data for its process execution and communication protocols. Due to its complex properties, a manual analysis and detection of problems on this data is too time-consuming and expensive, and hence not feasible. As a consequence, features and automatic learning systems on this type of data are highly sought after. ...

State Representation Learning with Robotic Priors for Partially Observable Environments Data

Morik, Marco ; Rastogi, Divyam ; Brock, Oliver (2019)

We introduce Recurrent State Representation Learning (RSRL) to tackle the problem of state representation learning in robotics for partially observable environments. To learn low dimensional state representations, we combine a Long Short Term Memory network with robotic priors. RSRL introduces new priors with landmarks and combines them with existing robotics priors in literature to train the r...

A Response to the United Nations CITES Blockchain Challenge: Incremental and Integrative PoA-based Permit Exchange

Busse, Anselm ; Eberhardt, Jacob ; Frost, Sebastian ; Kim, Dong-Ha ; Weilbier, Thore ; Renner, Lukas ; Roth, Matthias ; Tai, Stefan (2019)

The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) negotiated and administered by the United Nations Environment Programme (UNEP) regulates the international trade of endangered species and derived products through a permit-based system. Currently, the permit process is paper-based and hence highly prone to manipulations and errors. Being aware of blockc...

Exploring Deployment Strategies for the Tor Network

Döpmann, Christoph ; Rust, Sebastian ; Tschorsch, Florian (2018)

In response to upcoming performance and security challenges of anonymity networks like Tor, it will be of crucial importance to be able to develop and deploy performance improvements and state-of-the-art countermeasures. In this paper, we therefore explore different deployment strategies and review their applicability, impact, and risks to the Tor network. In a simulation-based evaluation, whic...

Towards a Concurrent and Distributed Route Selection for Payment Channel Networks

Rohrer, Elias ; Laß, Jann-Frederik ; Tschorsch, Florian (2017)

Payment channel networks use off-chain transactions to provide virtually arbitrary transaction rates. In this paper, we provide a new perspective on payment channels and consider them as a flow network. We propose an extended push-relabel algorithm to find payment flows in a payment channel network. Our algorithm enables a distributed and concurrent execution without violating capacity constrai...

Webchain: Verifiable Citations and References for the World Wide Web

Rohrer, Elias ; Heidel, Steffen ; Tschorsch, Florian (2018)

Readers’ capability to consider and assess sources is imperative. Digital preservation efforts, however, mostly neglected citation provenance, which is a necessity for transparent source verification. We therefore present Webchain, a new system enabling verifiable citations and references on the World Wide Web. Its architecture combines a distributed ledger with secure timestamping to ensure hi...