Inst. Telekommunikationssysteme

206 Items

Recent Submissions
Prototyping nfv-based multi-access edge computing in 5G ready networks with open baton

Carella, Giuseppe Antonio ; Pauls, Michael ; Magedanz, Thomas ; Cilloni, Marco ; Bellavista, Paolo ; Foschini, Luca (2017)

With the increasing acceptance of Network Function Virtualization (NFV) and Software Defined Networking (SDN) technologies, a radical transformation is currently occurring inside network providers infrastructures. The trend of Software-based networks foreseen with the 5th Generation of Mobile Network (5G) is drastically changing requirements in terms of how networks are deployed and managed. On...

Seamless interoperability and data portability in the social web for facilitating an open and heterogeneous online social network federation

Göndör, Sebastian Jürg (2018)

Online Social Networks (OSN) have become an integral part of our everyday lives. We express ourselves, create and collect content such as images or videos, share content and information with our friends and colleagues, exchange messages, or keep track of what's happening in the world. Yet, despite social communication being implicitly a distributed, decentralized phenomenon, most OSN services a...

Data-driven estimation and neurophysiological assessment of perceived visual quality

Bosse, Sebastian (2018)

Perceptual quality is one of the key aspects of modern multimedia communication systems. Nevertheless, the questions of how to reliably assess quality as perceived by humans, how to computationally estimate perceived quality and how to incorporate computational models of quality in multimedia systems can still not be answered satisfactorily, despite decades of research. However, these problems ...

Implementation of Cognitive Driver Models in Microscopic Traffic Simulations

Cristea, Roland ; Rulewitz, Stefan ; Radusch, Ilja ; Hübner, Karl ; Schünemann, Björn (2016)

In order to perform microscopic traffic simulations as realistically as possible, a detailed modelling of each individual driver is essential. Currently established microscopic traffic simulators follow a rather static approach to model the driver's behaviour. Individual emotional in uences and temporarily occurring distracting factors are heavy to implement in the established state-of-the-art ...

Explanation Retrieval in Semantic Networks

Michalke, Vanessa N. ; Hartig, Kerstin (2016)

Spreading Activation is a well-known semantic search technique to determine the relevance of nodes in a semantic network. When used for decision support, meaningful explanations of semantic search results are crucial for the user’s acceptance and trust. Usually, explanations are generated based on the original network. Indeed, the data accumulated during the spreading activation process contain...

Good RE artifacts? I know it when I use it!

Femmer, Henning ; Vogelsang, Andreas (2017)

The definition of high-quality or good RE artifacts is often provided through normative references, such as quality standards or text books (e.g., ISO/IEEE/IEC-29148). We see various problems of such normative references. Quality standards are incomplete. Several quality standards describe quality through a set of abstract criteria. When analyzing the characteristics in detail, we see that th...

Time-dependent recommender systems for the prediction of appropriate learning objects

Krauß, Christopher (2018)

This dissertation deals with adaptive learning technologies which aim to optimize Technology Enhanced Learning (TEL) offerings to fit the individual learner’s needs. Thereby, Recommender Systems play a key role in supporting the user’s decision process for items of interest. This works very well for e-commerce and Video on Demand services. However, it is found to be the case that these traditio...

SLRefactor: Ein Refactoring-Ansatz für Simulink-Modelle

Tran, Quang Minh ; Winkler, Jonas Paul ; Dziobek, Christian (2015)

Bei der Funktionsmodellierung ist die Veränderung und Erweiterung der Struktur eines Modells eine häufig durchgeführte Aktivität. Während es bereits Refactoring-Ansätze für textuelle Programmiersprachen wie Java, C# usw. gibt, fehlt ein vergleichbarer, integraler und durchgehender Ansatz für Simulink-Modelle. Wir haben einen automatisierten Refactoring-Ansatz (im Folgenden SLRefactor-Ansatz gen...

Automatic glossary term extraction from large-scale requirements specifications

Gemkow, Tim ; Conzelmann, Miro ; Hartig, Kerstin ; Vogelsang, Andreas (2018)

Creating glossaries for large corpora of requirments is an important but expensive task. Glossary term extraction methods often focus on achieving a high recall rate and, therefore, favor linguistic proecssing for extracting glossary term candidates and neglect the benefits from reducing the number of candidates by statistical filter methods. However, especially for large datasets a reduction o...

Multidimensional modulation formats for optical transmission systems

Alreesh, Saleem (2018)

The ever-increasing demand for bandwidth is constantly driving deployment of new strategies to enable the upgrading of current optical transmission systems. Therefore, next generation optical networks are required to be elastic and more efficiently utilize the available optical spectrum; this in turn increases spectral efficiency and overall network capacity. To this end, future optical transce...

Using tools to assist identification of non-requirements in requirements specifications

Winkler, Jonas Paul ; Vogelsang, Andreas (2018)

[Context and motivation] In many companies, textual fragments in specification documents are categorized into requirements and non-requirements. This categorization is important for determining liability, deriving test cases, and many more decisions. In practice, this categorization is usually performed manually, which makes it labor-intensive and error-prone. [Question/Problem] We have develo...

Recommendation-based decision support for hazard analysis and risk assessment

Hartig, Kerstin ; Karbe, Thomas (2016)

Since 2011, automotive companies have to adhere to the functional safety standard ISO 26262. One important safety activity described in the standard is the hazard analysis and risk assessment, which is strongly expert-driven, and therefore expensive, time consuming, and dependent from the individual expert’s opinion. In this paper, we present a decision support system for hazard analyses in ord...

Semantic network skeletons - a tool to analyze spreading activation effects

Hartig, Kerstin ; Karbe, Thomas (2016)

Spreading Activation algorithms are a well-known tool to determine relevance of nodes in a semantic network. Although often used, the configuration of a spreading activation algorithm is usually very problem-specific, and experience-driven. There are practically no guidelines or tools to help with the task. In this paper, we present semantic network skeletons, which are essentially a structural...

Spreading activation simulation with semantic network skeletons

Hartig, Kerstin ; Karbe, Thomas (2017)

Spreading activation algorithms are a well-known tool to determine the mutual relevance of nodes in a semantic network. Although often used, the configuration of a spreading activation algorithm is usually problem-specific and experiencedriven. However, an excessive exploration of spreading behavior is often not applicable due to the size of most semantic networks. A semantic network skeleton p...

Automatische Erkennung von Model Smells in Simulink-Modellen

Winkler, Jonas Paul ; Tran, Quang Minh (2014)

Simulink-Modelle werden mit zunehmender Komplexität anfällig für Qualitätsdefizite. Die Ursache dafür sind strukturelle Probleme, sogenannte Model Smells. Die manuelle Erkennung von Model Smells ist aufwändig, daher wird ein Verfahren zur automatisierten Erkennung von Model Smells vorgestellt. Dieses ermöglicht es Modellierern, effizient die Qualität von Modellen zu verbessern.

Automatische Klassifikation von Anforderungen zur Unterstützung von Qualitätssicherungsprozessen

Winkler, Jonas Paul (2016)

Während des Requirements-Engineering werden Anforderungen an zu entwickelnde Systeme und Komponenten in Form von Lastenheften dokumentiert. Diese Lastenhefte enthalten neben rechtlich relevanten Anforderungen weitere Inhalte wie Erklärungen, Zusammenfassungen und Abbildungen. Um zwischen Anforderungen und solchen Zusatzinformationen unterscheiden zu können, werden alle Lastenheftinhalte manuell...

Automatische Duplikateliminierung in Aktivitätsdiagrammen von Fahrzeugfunktionen

Beckmann, Martin ; Schlutter, Aaron (2016)

Die Spezifikation von Fahrzeugfunktionen ist eine komplexe Aufgabe. Zum Umgang mit dieser Komplexität werden zur Beschreibung der Funktionen grafische Modellierungssprachen wie UML verwendet. Bei der Modellierung können Duplikate entstehen, welche Ausgangspunkt für Fehler und Inkonsistenzen in der weiteren Entwicklung sind. Dieser Beitrag widmet sich der Eliminierung von Duplikaten, welche bei ...

Protokollierung von CAN-Nachrichten mithilfe eines integrierten Data Warehouse

Beckmann, Martin (2014)

Diese Arbeit beschäftigt sich mit der Entwicklung eines Werkzeuges zur Verarbeitung von CAN-Nachrichten von Steuergeräten. Die Nachrichten werden anschließend protokolliert, um eine Auswertung im Rahmen von Softwaretests zu ermöglichen. Dazu wurde eine Hardwarelösung entwickelt und eine passende Software implementiert.

How do practitioners perceive the relevance of requirements engineering research?

Franch, Xavier ; Fernández, Daniel Méndez ; Oriol, Marc ; Vogelsang, Andreas ; Heldal, Rogardt ; Knauss, Eric ; Travassos, Guilherme Horta ; Carver, Jeffrey C. ; Dieste, Oscar ; Zimmermann, Thomas (2017)

The relevance of Requirements Engineering (RE) research to practitioners is a prerequisite for problem-driven research in the area and key for a long-term dissemination of research results to everyday practice. To understand better how industry practitioners perceive the practical relevance of RE research, we have initiated the RE-Pract project, an international collaboration conducting an empi...

Automatic classification of requirements based on convolutional neural networks

Winkler, Jonas Paul ; Vogelsang, Andreas (2017)

The results of the requirements engineering process are predominantly documented in natural language requirements specifications. Besides the actual requirements, these documents contain additional content such as explanations, summaries, and figures. For the later use of requirements specifications, it is important to be able to differentiate between legally relevant requirements and other aux...