Computers - Computer Science

Requirements engineering (RE) has the overall goal of establishing the vision of the system in its relevant context. For this goal, all stakeholders must disclose, discuss, and align their mental models of the system by explicitly communicating their goals, ideas, needs, and expectations. This...

Events are an essential element of society. Advancing digital technologies and the ongoing globalization has put forward a variety of different business, leisure, or scientific events that need to be managed in order to take place. As a result of the proliferation of digital...

The classical exponential polynomials, today commonly named after E., T. Bell, have a wide range of remarkable applications in Combinatorics, Algebra, Analysis, and Mathematical Physics. Within the algebraic framework presented in this book they appear as structural coefficients in finite expansions of certain higher-order...

The thesis describes the fundamental problems in the individualization of information-intensive and consumer-oriented services. The guiding research discipline of this thesis is Wirtschaftsinformatik. Furthermore, Service Dominant Logic is applied to explain how services can create added value for customers. In the state of the...

Information system architecture (ISA) specification as a part of the software engineering field has been an information systems research topic since the 1960's. There have been manifold specification methodologies over the recent decades, developed recently or adapted in order to target the domains of...

During the last century, navigation systems have become ubiquitous and guide drivers, cyclists, and pedestrians towards their desired destinations. While operating worldwide, they rely on line-of-sight conditions towards satellites and are thus limited to outdoor areas. However, finding a gate within an airport, a...

To further improve the NLOS detection and mitigation performance for Ultra-wideband (UWB) system, this thesis systematically investigates the UWB LOS/NLOS errors. The LOS errors are evaluated in different environments and with different distances. Different blockage materials and blockage conditions are considered for NLOS errors....

The Simplex algorithm is one of the most important algorithms in discrete optimization, and is the most used algorithm for solving linear programs in practice. In the last 50 years, several pivot rules for this algorithm have been proposed and studied. For most deterministic...

An ensemble system is a collection of nearly identical dynamical systems which admit a certain degree of heterogeneity, and which are subject to the restriction that they may only be manipulated or observed as a whole. This thesis presents analysis and control methods for...

After sales services increasingly gained importance in the mechanical engineering industry within the last decades. Nowadays, provisioning of spare parts as well as related maintenance, repair and overhaul services constitutes a valuable and differentiating source for profit. Corresponding spare parts supply chains operationalize this...

In the context of this dissertation, methods were investigated that can contribute to a successful digitization strategy in experimental synthetic chemistry. Three areas were identified which could support a change in the current documentation and working methods. These are (1) the development of software...

Software testing is becoming increasingly important because more and more products are software-intensive. Cars, for example, contain more and more control software (ECUs) that are networked with each other. With new rail vehicles, software problems delay commissioning by months, even years, because the different...

In the context of advanced driver-assistance systems (ADAS), vehicles are equipped with multiple sensors to record the vehicle's environment and use intelligent algorithms to understand the data. This study contributes to the research in modern ADAS on different aspects. Methods deployed in ADAS must...

The automotive industry is changing rapidly. E-Mobility, self-driving and other trends revolutionize the automotive industry. These trends have to be addressed when developing new car generations and future mobility solutions. This is challenging for the automotive domain with its special peculiarities such as rigid...

Past research on the analysis of the Received Signal Strength Indicator (RSSI) of a radio transmission indicates that radio signals can be used as passive sensing technology to detect the presence of persons. This way, a detection system can be built from inexpensive commercial...

The human perception of the environment is determined by the fact that a large number of sensory impressions are recorded and processed simultaneously by the brain. The combination of these individual information ensures that humans are able to resolve perceptual ambiguities. Based on this...

The rise of Information and Communication Technology (ICT) in the second half of the 20th century became the dominant force in economics. Its rise accelerates in the first 15 years of this century at an astonishing speed. The world of ICT right now is...

The exchange of orbit information is becoming more important in view of the increasing population of objects in space as well as the increase in parties involved in space operations. The aim of this thesis was to investigate how orbit information maintained by a...

Shape matching and recognition is a fundamental aspect of many problems in computer vision, including object or scene recognition, moving tracking and object detection, etc. While rigid shape matching is relatively well understood, matching shapes undergoing non-rigid deformations remains challenging. Moreover, shape generation is...

The research described in this thesis was inspired by the results of the myCopter project, a European project funded by the European Commission in 2011. The myCopter project's aim was to identify new concepts for air transport that could be used to achieve a...

The reactive scattering for H- + H_2 and H+ + H_2 and its isotopologues were investigated using different methods. The studies aimed at providing insights into elementary reactions, and go beyond these to more complexchemical reactions. By comparison of the reaction probabilities of H+...

This thesis is about a new model querying and transformation approach called FunnyQT which is realized as a set of APIs and embedded domain-specific languages (DSLs) in the JVM-based functional Lisp-dialect Clojure. Founded on a powerful model management API, FunnyQT provides querying services such...

One of the main goals of the pervasive computing domain is to provide the user with task support for everyday tasks. This task support should be realized by pervasive applications that are seamlessly integrated in the environment, for example embedded into devices such as...

This thesis is dedicated to the problem of object recognition in the three-dimensional space. Instead of using exclusively the information typically transported by a two-dimensional image, the concept of this work additionally incorporates the third dimension, namely the depth. The depth data itself is...

In this dissertation, novel Content-based Microscopic Image Analysis (CBMIA) methods, including Weakly Supervised Learning (WSL), are proposed to aid biological studies. In a CBMIA task, noisy image, image rotation, and object recognition problems need to be addressed. To this end, the first approach is...

The discipline of mixed-integer nonlinear programming (MINLP) deals with finite-dimensional optimization problems featuring both discrete choices and nonlinear functions. By this combination, it facilitates more accurate models of real-world systems than possible with purely continuous or purely linear models alone. This book presents new...

Orbital debris is becoming an increasing problem for space flight missions. New satellite launches, explosions, collisions and other events cause a steady rise in the number of objects orbiting the Earth. It is therefore important to determine the future development of the object population,...

The use of heterogeneous computing resources, such as graphics processing units or other specialized co-processors, has become widespread in recent years because of their performance and energy efficiency advantages. Operating system approaches that are limited to optimizing CPU usage are no longer sufficient for...

An implantable system to invasively acquire muscle activity for controlling a bionic hand prosthesis is presented. The system utilizes two wireless interfaces for data and power transmission. Furthermore, a multichannel custom made low-power application specific integrated circuit (ASIC) was designed in 130 nm technology...

This thesis presents the foundations, the initial state, and the progress made in modelling and implementing a real-world and real-time online microscopic traffic simulation system for highway traffic. To successfully model and implement such a simulation system, this thesis recommends the use of a...

TInfluences of external error sources on measurements of room acoustic parameters Aby Martin Guski DCorrect and precise measurements of room acoustic parameters are of fundamental importance for subjective room impression characterization and for the physical description of the sound field. This thesis investigates external...

Adaptive wavelet methods have recently proven to be a very powerful instrument for the numerical treatment of nonlinear partial differential equations. In many cases, these methods can be shown to converge with an optimal rate with respect to the degrees of freedom and in...

Companies, especially in the consumer goods industry, have realized the importance of flexibility in their distribution networks for the provision of high customer service levels. The challenge is to determine how flexibility potentials such as excess capacities in storage and transport should be set...

This work is a showcase for the integration of systems biology and bioinformatics tools, algorithms and models for deciphering biological phenomena. More specifically, it integrates (i) prediction algorithms for identifying and characterizing molecular interactions, (ii) structural modelling of molecule complexes, (iii) network analysis approaches,...

Die effiziente und nachhaltige Ausgestaltung der rettungsdienstlichen Infrastruktur zur Sicherstellung einer hohen kommunalen Versorgungsqualitat stellt eine komplexe Planungsaufgabe dar. Insbesondere Fragestellungen der Standortplanung fur Rettungswachen und Rettungsmittel (z.B. RTWs) sind in einem dynamischen und durch Unsicherheit gepragten Umfeld fur die rechtzeitige Versorgung in Notfallsituationen...

The relevance of the Internet has dramatically grown in recent decades. However, the enormous financial impact attracts many types of criminals. Setting up proper security mechanisms (e.g., Intrusion Detection Systems) has therefore never been more important than today. To keep up with today's data...

The Beilstein Symposia address contemporary issues in the chemical and related sciences by employing and interdisciplinary approach. Scientists from a wide range of areas are invited to present aspects of their work for discussion, with the aim of not only advancing sciences, but also...

This work discusses methods for efficient audio processing with finite impulse response (FIR) filters. Such filters are widely used for high-quality acoustic signal processing, e.g. for headphone or loudspeaker equalization, in binaural synthesis, in spatial sound reproduction techniques and for the auralization of reverberant...

Regular languages have a wide area of applications. This makes it an important task to convert between different forms of regular language representations, and to compress the size of such representations. This book studies modern aspects of compressions and conversions of regular language representations....

This work considers the problem of identifying the fault in a faulty dynamical system on the basis of the system's input and output signals only. For this purpose, a model-based method for the design of diagnostic tests which consist of specific input signals and...

Dynamic faces are highly complex, ecologically and socially relevant stimuli which we encounter almost everyday. When and what we extract from this rich source of information needs to be well coordinated by the face perception system. The current thesis investigates how this coordination is...

Nowadays, distributed software development has become more common. In a distributed project setting, managing experience is even more crucial than in a co-located project. Problems like ineffective communication, lack of awareness and trust and restrictive information flow policies impede experience exchange and raise the...

The content of this book reflects the results of the work carried out during my dissertation. For the first time the functionality of a GNSS receiver has been combined with the information gathered from a time-code receiver. For high efficient signal processing the architecture...

Today, virtual reality technology is a multi-purpose tool for diverse applications in various domains. However, research has shown that virtual worlds are often not perceived in scale, especially regarding egocentric distances, as the programmer intended them. While the main reason for this misperception of...

Monte-Carlo Tree Search (MCTS) is a class of simulation-based search algorithms. It brought about great success in the past few years regarding the evaluation of deterministic two-player games such as the Asian board game Go. In this thesis, we present a parallelization of the...

This thesis contributes to the fields of data compression and compressed sensing and their application to imaging mass spectrometry and sporadic communication. Compressed sensing is mainly built on the knowledge that most data is compressible or sparse, meaning that most of its content is...

This publication includes the Proceedings of the PLE Conference 2013. The Conference on Personal Learning Environments is now an established annual international, scientific event and a reference point for the current state of the art in research and development in Personal Learning Environments (PLE)....

Lecture recordings, so called e-lectures, are widely spread across universities. But, concerning those e-lectures, there exist two problems. On the one hand, it is very easy for users just to lean back and not become active. From the perspective of learning theory, this is...

Magnetic storage media are a topic of great interest for technological and fundamental research. Examinations of nanostructured magnetic systems for storage media often aim at decreasing the pattern size, in order to enhance the possible information density in a given area. Here another approach...

The Fields medalist, Terence Tao, recently emphasized the importance of "hard" (or finitary) analysis and connected the finitisation to the methods we will employ in this thesis: ... The main advantage of working in a finitary setting ... is that the underlying dynamical system...