Robert Buchholz

• PhD
• Otto-von-Guericke University Magdeburg

The simulation of discrete stochastic systems is used to make predictions on system behaviour. Its most widely used technique, discrete event simulation, computes possible simulation results by using random numbers. Consequently, these results are also only random numbers. Alternative state space–based simulation techniques can directly compute the...

Autonomous aviation continuously becomes more and more important. Algorithms that enable this autonomy have developed quickly in the last years. This paper describes a concept for a reactive path planning algorithm. The aim is to develop a method for static obstacle avoidance of an unmanned aerial vehicle (UAV) by calculating collision-free paths w...

At the first gate of an innovation process, a large number of raw ideas must be evaluated and those good enough to continue to the next phase be selected. No information about these ideas is available, so they have a high level of uncertainty. We present an algorithm that selects and ranks a set of alternatives in optimal time. The algorithm addres...

The analysis of partially-observable discrete stochastic systems reconstructs the unobserved behavior of real-world systems. An example for such a system is a production facility where indistinguishable items are produced by two machines in stochastically distributed time intervals and are then tested by a single quality tester. Here, the source of...

This paper introduces the idea of a Virtual Stochastic Sensor. This paradigm enables the analysis of unobservable processes in discrete stochastic systems. Just like a virtual sensor, we use physical sensor readings to deduce the value of the quantity of interest. However, both the physical sensor readings and their relationship with the quantity o...

The paper introduces a new event-driven state space-based analysis algorithm for hidden non-Markovian models (HnMMs). HnMMs have been developed recently to enable the analysis of hidden discrete stochastic systems based on their observ-able output, e.g. to determine the unobserved causes of observed defects. There are currently two known approaches...

Many complex technical systems today have some basic protocol capability, which is used for example to monitor the quality of production output or to keep track of oil pressure in a modern car. The recorded protocols are usually used to detect deviations from some predefined standards and issue warnings. However, the information in such a protocol...

One important goal in the field of multi-user interaction is to support collaborative work of several users as ergonomic as possible. Unfortunately, security-relevant aspects were neglected in the past. Therefore, we study in this contribution the risks and challenges for security of such collaborative working environments on the basis of five sele...

Discrete stochastic models (DSM) are widely used in various application fields today. Proxel-based simulation can outperform discrete event-based approaches in the analysis of small stiff DSM, which can occur for example in reliability modeling. However, when parallel processes with largely differing speed are involved, the faster process determine...

Media forensics tries to determine the originating device of a signal. We apply this paradigm to microphone forensics, determining the microphone model used to record a given audio sample. Our approach is to extract a Fourier coefficient histogram of near-silence segments of the recording as the feature vector and to use machine learning techniques...

To provide intuitive ways of interacting with media data, this research work addresses the seamless combination of sensor-enabled phones with large displays. An intuitive basic set of tilt gestures is introduced for a stepwise or continuous interaction with both mobile applications and distant user interfaces by utilizing the handheld as a remote c...

To overcome limitations of small screens and to provide intuitive ways of interacting with personal data, this work addresses the seamless combination of sensor-enabled phones with large displays. An intuitive basic set of tilt gestures is introduced for a stepwise or continuous interaction with both mobile applications and distant user interfaces...