Inst. Telekommunikationssysteme

238 Items

Recent Submissions
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...

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...

Crowdsourcing as a guardian of transparency, privacy, and anti-discrimination in a personalized web

Iordanou, Kostas (2019)

The main focus of this thesis is the evaluation of crowdsourcing techniques to measure personalization on the Web. Overall, I apply my methodology in four different aspects on the Web. (1) First, I investigate price discrimination and how personal data can influence online pricing. (2) Then, I turn my attention on targeted web advertisements and investigate how targeted ads can be detected in r...

Efficient data delivery in 5G mobile communication networks

Li, Yilin (2019)

Die ständig zunehmende Verbreitung intelligenter Geräten, die Einführung neuer benutzerorientierter unternehmenskritischer Anwendungen, sowie ein exponentieller Anstieg der Nachfrage und Nutzung mobiler Daten, belasten die bestehenden Mobilfunknetze erheblich. Tatsächlich muss der Mobilfunk der fünften Generation (5G) ein Paradigmenwechsel sein, der sehr hohe Trägerfrequenzen mit großen Bandbre...

A Lightweight Multilevel Markup Language for Connecting Software Requirements and Simulations

Pudlitz, Florian ; Vogelsang, Andreas ; Brokhausen, Florian (2019-03-08)

[Context] Simulation is a powerful tool to validate specified requirements especially for complex systems that constantly monitor and react to characteristics of their environment. The simulators for such systems are complex themselves as they simulate multiple actors with multiple interacting functions in a number of different scenarios. To validate requirements in such simulations, the requir...

Distributed and sparse signal processing

Limmer, Steffen (2019)

The 21st century will be remembered for the ubiquity of data. Data analysis has become an indispensable tool for finding patterns in high-dimensional datasets, and the steep increase in computational power allows us to execute ever more sophisticated algorithms. However, it is not foreseeable that the rise of computational resources alone will evade the curse of dimensionality attached to probl...

Strategies and Best Practices for Model-based Systems Engineering Adoption in Embedded Systems Industry

Amorim, Tiago ; Vogelsang, Andreas ; Pudlitz, Florian ; Gersing, Peter ; Philipps, Jan (2019)

[Context] Model-based Systems Engineering (MBSE) advocates the integrated use of models throughout all development phases of a system development life-cycle. It is also often suggested as a solution to cope with the challenges of engineering complex systems. However, MBSE adoption is no trivial task and companies, especially large ones, struggle to achieve it in a timely and effective way. [Goa...

Supporting the Development of Cyber-Physical Systems with Natural Language Processing: A Report

Vogelsang, Andreas ; Hartig, Kerstin ; Pudlitz, Florian ; Schlutter, Aaron ; Winkler, Jonas (2019)

Software has become the driving force for innovations in any technical system that observes the environment with different sensors and influence it by controlling a number of actuators; nowadays called Cyber-Physical System (CPS). The development of such systems is inherently inter-disciplinary and often contains a number of independent subsystems. Due to this diversity, the majority of develop...

Traceability Analysis of a High-Level Automotive System Architecture Document

Hild, Dennis ; Beckmann, Martin ; Vogelsang, Andreas (2019)

More and more functions in automotive systems are enabled and controlled by software that is distributed over a large number of systems and components. In addition, the systems are more and more interconnected to implement the desired vehicle functions. Creating and maintaining a high-level overview of the relations between vehicle functions, systems, and components in a complete and consistent...

Synthesized view distortion computation by rendering for depth map encoding

Tech, Gerhard (2019)

Depth-based 3D video allows to synthesize additional views for auto-stereoscopic displays. For synthesized view distortion (SVD) aware compression of the depth data, prior methods consider only an SVD estimate. This thesis targets a different approach: Rendering of the synthesized view and direct computation of the exact SVD. This approach raises several questions, which this thesis addresses ...

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...

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...

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...

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...

A Location Prediction Algorithm for Mobile Communications Using Directional Antennas

Lu, Xiaofeng ; Lio, Pietro ; Hui, Pan ; Jin, Haifei (2013)

A directional communication scheme, TRAC, is proposed in this paper to deal with issues in mobile directional communications. Directional communication can bring benefits in terms of spatial reuse, power consumption, and security. Using direction antennas implies that the transmitters must know the direction or location of the receiver. It is necessary to predict the receiver's location to keep...

Knowledge Representation of Requirements Documents Using Natural Language Processing

Schlutter, Aaron ; Vogelsang, Andreas (2018)

Complex systems such as automotive software systems are usually broken down into subsystems that are specified and developed in isolation and afterwards integrated to provide the functionality of the desired system. This results in a large number of requirements documents for each subsystem written by different people and in different departments. Requirements engineers are challenged by compre...

Geofences on the Blockchain: Enabling Decentralized Location-based Services

Victor, Friedhelm ; Zickau, Sebastian (2018)

A decentralized ride- or carsharing application is among the early proposals of what smart contracts on blockchains may enable in the future. To facilitate use cases in the field of location-based services (LBS), smart contracts need to receive trustworthy positioning information, and be able to process them. We propose an approach on how geofences can be defined in smart contracts, and how sup...

Self-Management – Potentiale, Probleme, Perspektiven

Herrmann, Klaus ; Mühl, Gero ; Geihs, Kurt (2004)

Gordon Moores Gesetz vom exponentiellen Wachstum der Transistordichte pro Quadrat-Zoll hat seit 1965 die IT-Industrie geprägt. Mit der damit einhergehenden Explosion der Rechnerleistung wurde die Software immer leistungsfähiger, und man ist dazu übergegangen, Rechnersysteme zu vernetzen und Anwendungen zu verteilen. Eine Folge dieser Entwicklungen ist die rapide zunehmende Komplexität der moder...

An Architecture for a Next Generation VoIP Transmission System

Hoene, Christian ; Clüver, Kai ; Weil, Jan (2007)

Packetized speech transmission systems implemented with Voice over IP are gaining momentum against the traditional circuit switched systems despite the fact that packet switched VoIP is two to three times less efficient than its circuit switched counterpart. At the same time, it only supports a rather bad “toll” quality. We believe that it is time for a new architecture developed from scratch –...