1,027 research outputs found
Optimal Stabilization of Periodic Orbits
In this contribution the optimal stabilization problem of periodic orbits is
studied in a symplectic geometry setting. For this, the stable manifold theory
for the point stabilization case is generalized to the case of periodic orbit
stabilization. Sufficient conditions for the existence of a \gls{nhim} of the
Hamiltonian system are derived. It is shown that the optimal control problem
has a solution if the related periodic Riccati equation has a unique periodic
solution. For the analysis of the stable and unstable manifold a coordinate
transformation is used which is moving along the orbit. As an example, an
optimal control problem is considered for a spring mass oscillator system,
which should be stabilized at a certain energy level.Comment: Submitted for IFAC World Congress 202
Differential Emotions and the Stock Market - The Case of Company-Specific Trading
Practitioners and researchers alike increasingly use social media messages as an additional source of information to analyse stock price movements. In this regard, previous preliminary findings demonstrate the incremental value of considering the multi-dimensional structure of human emotions in sentiment analysis instead of the predominant assessment of the binary positive-negative valence of emotions. Therefore, based on emotion theory and an established sentiment lexicon, we develop and apply an open source dictionary for the analysis of seven different emotions (affection, happiness, satisfaction, fear, anger, depression, and contempt).To investigate the connection between the differential emotions and stock movements we analyse approximately 5.5 million Twitter messages on 33 S&P 100 companies and their respective NYSE stock prices from Yahoo!Finance over a period of three months. Subsequently, we conduct a lagged fixed-effects panel regression on the daily closing value differences. The results generally support the assumption of the necessity of considering a more differentiated sentiment. Moreover, comparing positive and negative valence, we find that only the average negative emotionality strength has a significant connection with company-specific stock price movements. The emotion specific analysis reveals that an increase in depression and happiness strength isassociated with a significant decrease in company-specific stock prices
Room-temperature transverse-electric polarized intersubband electroluminescence from InAs/AlInAs quantum dashes
We report the observation of transverse electric polarized
electroluminescence from InAs/AlInAs quantum dash quantum cascade structures up
to room temperature. The emission is attributed to the electric field confined
along the shortest lateral dimension of the dashes, as confirmed by its
dependence on crystallographic orientation both in absorption measurements on a
dedicated sample and from electroluminescence itself. From the absorption we
estimate a dipole moment for the observed transition of =1.7 nm. The
electroluminescence is peaked at around 110 meV and increases with applied
bias. Its temperature dependence shows a decrease at higher temperatures
limited by optical phonon emission.Comment: 15 pages, 4 figures, submitted to Applied Physics Letter
Remote Monitoring and Teleoperation of Autonomous Vehicles Is Virtual Reality an Option?
While the promise of autonomous vehicles has led to significant scientific
and industrial progress, fully automated, SAE level 5 conform cars will likely
not see mass adoption anytime soon. Instead, in many applications, human
supervision, such as remote monitoring and teleoperation, will be required for
the foreseeable future. While Virtual Reality (VR) has been proposed as one
potential interface for teleoperation, its benefits and drawbacks over physical
monitoring and teleoperation solutions have not been thoroughly investigated.
To this end, we contribute three user studies, comparing and quantifying the
performance of and subjective feedback for a VR-based system with an existing
monitoring and teleoperation system, which is in industrial use today. Through
these three user studies, we contribute to a better understanding of future
virtual monitoring and teleoperation solutions for autonomous vehicles. The
results of our first user study (n=16) indicate that a VR interface replicating
the physical interface does not outperform the physical interface. It also
quantifies the negative effects that combined monitoring and teleoperating
tasks have on users irrespective of the interface being used. The results of
the second user study (n=24) indicate that the perceptual and ergonomic issues
caused by VR outweigh its benefits, like better concentration through
isolation. The third follow-up user study (n=24) specifically targeted the
perceptual and ergonomic issues of VR; the subjective feedback of this study
indicates that newer-generation VR headsets have the potential to catch up with
the current physical displays
Exploranative Code Quality Documents
Good code quality is a prerequisite for efficiently developing maintainable
software. In this paper, we present a novel approach to generate exploranative
(explanatory and exploratory) data-driven documents that report code quality in
an interactive, exploratory environment. We employ a template-based natural
language generation method to create textual explanations about the code
quality, dependent on data from software metrics. The interactive document is
enriched by different kinds of visualization, including parallel coordinates
plots and scatterplots for data exploration and graphics embedded into text. We
devise an interaction model that allows users to explore code quality with
consistent linking between text and visualizations; through integrated
explanatory text, users are taught background knowledge about code quality
aspects. Our approach to interactive documents was developed in a design study
process that included software engineering and visual analytics experts.
Although the solution is specific to the software engineering scenario, we
discuss how the concept could generalize to multivariate data and report
lessons learned in a broader scope.Comment: IEEE VIS VAST 201
An investigation of production and transportation policies for multi-item and multi-stage production systems
Die vorliegende kumulative Dissertation besteht aus fünf Artikeln, einem Arbeitspapier und vier Artikeln, die in wissenschaftlichen Zeitschriften veröffentlicht wurden. Alle fünf Artikel beschäftigen sich mit der Losgrößenplanung, jedoch mit unterschiedlichen Schwerpunkten. Artikel 1 bis 4 untersuchen das Economic Lot Scheduling Problem (ELSP), während sich der fünfte Artikel mit einer Variante des Joint Economic Lot Size (JELS) Problems beschäftigt. Die Struktur dieser Dissertation trägt diesen beiden Forschungsrichtungen Rechnung und ordnet die ersten vier Artikel dem Teil A und den fünften Artikel dem Teil B zu
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