3,535 Works

Temporal models in data mining : enrichment, summarization and recommendation

Anh Tuan Tran
Die Zeit spielt eine wichtige und vielseitige Rolle dabei, die digitalen Sammlungen unter Berücksichtigung der Beziehung zu den Nutzern zu studieren. Dies gilt inbesondere, wenn digitale Inhalte lange nach ihrem Erstellungszeitpunkt verarbeitet werden und die Zeitraum, in dem zahlreiche Ereignisse beobachtet werden können, erzeugt wird. Zum Beispiel: Die Dokumente werden geändert oder überarbeitet; Benutzer werden anderen verbundenen Information in der Sammlung ausgesetzt und damit ihr Wissen, ihre Interpretation und Ihre Interesse aktualisieren. Ein weiteres Beispiel...

Safety Map: A Tool for Global Robot Safety Evaluation and Safe Robot Design

Nico Mansfeld, Mazin Hamad, Marvin Becker, Antonio Gonzales Marin & Sami Haddadin
Safety is a key requirement in physical human- robot interaction. In particular, the influence of robot dynamic properties on human injury probability has to be understood well. Then, potential harm can be minimized already at an early stage of the robot design process. In this work, we propose the safety map concept, a map that captures the robot inherent safety properties and human injury occurrence in a unified way from both a global, and a...

Safety Map: A Unified Representation for Biomechanics Impact Data and Robot Instantaneous Dynamic Properties

Nico Mansfeld, Mazin Hamad, Marvin Becker, Antonio Gonzales Marin & Sami Haddadin
Close physical human-robot interaction makes it essential to ensure human safety. In particular, the intrinsic safety characteristics of a robot in terms of potential human injury have to be understood well. Then, minimal potential harm can be made a key requirement already at an early stage of the robot design. In this letter, we propose the safety map concept, a map that captures human injury occurrence and robot inherent global or task-dependent safety properties in...

Synthesis of siderophore-based conjugates to detect and treat bacterial infections.

Kevin Ferreira
Trotz der Entwicklung neuartiger Antiinfektiva steigen Morbidität und Mortalität aufgrund von Infektionen, die durch multiresistente Bakterien verursacht werden, weiter an.[1] Dies betrifft insbesondere Infektionen, die durch Gram-negative Bakterien verursacht werden. Die Herausforderung bei der Findung neuer Antibiotika besteht darin zu verstehen, wie eine ausreichende Translokation bioaktiver Moleküle durch die Zellwand Gram-negativer Bakterien gewährleistet werden kann. Zudem besteht ein Mangel an verlässlichen und empfindlichen Methoden, die die Erkennung von Bakterien zu einem frühen Zeitpunkt von Infektionen...

Parameterized complexity of decision problems in non-classical logics

Irena Schindler
Parameterized complexity is a branch of a computational complexity. The pioneers of this new and promising research field are Downey and Fellows. They suggest to examine the structural properties of a given problem and restrict the instance by a parameter. In this thesis we investigate the parameterized complexity of various problems in default logic and in temporal logics. In the first section of Chapter 3 we introduce a dynamic programming algorithm which decides whether a...

Computational complexity aspects of implicit graph representations

Maurice Chandoo
Implicit graph representations are immutable data structures for restricted classes of graphs such as planar graphs. A graph class has an implicit representation if the vertices of every graph in this class can be assigned short labels such that the adjacency of two vertices can be decided by an algorithm which gets the two labels of these vertices as input. A representation of a graph in that class is then given by the set of...

Methods for managing, validating and retrieving event-related information in evolving contexts

Andrea Ceroni
Events have always been fundamental building blocks of individual lives as well as of the whole world. Nowadays, thanks to the several technological advances achieved within the digital age, the processes of capturing, describing and spreading events have never been so simple and intuitive. This results in an ubiquitous presence of event-related information, which is digitally embedded in any form of media. Both the pervasiveness of such information as well as the benefits of its...

Towards the SQL Interferometer - length stabilization at the AEI 10 m-Prototype

Sina Maria Köhlenbeck
Neue Technologien zur Verbesserung der Empfindlichkeit von Gravitationswellendetektoren werden weltweit in Prototypenanlagen entwickelt und charakterisiert. Klassische Rauschquellen in den erdgebundenen interferometrischen Detektoren werden bald bis unterhalb der fundamentalen Quantenrauschgrenze unterdrückt werden. Diese entsteht bei niedrigen Frequenzen durch Quantenstrahlungsdruckrauschen und bei hohen Frequenzen durch Schrotrauschen. Diese beiden Quantenrauschquellen schneiden sich an einem Punkt auf dem Standardquantenlimit (SQL). Das SQL ist die Ortskurve, welche von den Schnittpunkten der beiden Rauschquellen für verschiedene Laserleistungen gebildet wird. Der AEI...

Switching the gas transport of metal-organic framework thin film membranes with external stimuli

Alexander Knebel
Within the scope of the thesis lies the synthesis of new metal-organic framework (MOF) membranes with the focus on state-of-the-art separation values. Therefore, we prepared thin layer MOF membranes, either as supported continuous membrane or as polymer-filler composite mixed-matrix membrane (MMM). High-end technologies such as the liquid-phase epitaxy are used to produce MOF layers by layer-by-layer growth. We used self-assembly to synthesise ultrathin MOF-on-MOF heterostructures with extremely controllable thickness. It is also possible to synthesise...

Gartendenkmalpflege in Niedersachsen : zwischen theoretischem Anspruch und möglicher Umsetzung

Rainer Schomann
Die als kumulative Dissertation angelegte Arbeit stellt dreißig Aufsätze des Verfassers aus der Zeit von 1994 bis 2015 zu Fragen praktischer sowie theoretischer Gartendenkmalpflege in Niedersachsen in einen neuen Zusammenhang, indem die Möglichkeiten der Umsetzung des gartendenkmalpflegerischen Interesses in den Fokus der Betrachtung gerückt wird. Dabei ist die geschichtliche Entwicklung von Gartendenkmalpflege in Niedersachsen von besonderer Bedeutung, da sich ihre Entwicklung maßgeblich auf die Möglichkeiten ausgewirkt hat. Ebenso werden aber auch die Ideale von Gartendenkmalpflege...

Der Begriff des Rechtsprinzips im Spannungsverhältnis zwischen dem Positivismus von Hart, Austin, Thibaut und dem Hermeneutismus von Dworkin und Savigny

Hyungsuk Kim
Der Grundzweck dieser Arbeit besteht darin, durch die Kritik des deskriptiven und politischen Rechtspositivismus den Begriff des Rechtsprinzips vor dem neuen Hintergrund zu erläutern. Als Ziel der Hauptkritik wurde insbesondere Regeltheorie von H.L.A. Hart eingestellt. Der Verfasser versucht nämlich zu zeigen, wie die Hartscher „externer Beobachter“ in sich das Moment der Selbstentfremdung hat. Durch das Zeigen jenes Schwächepunktes ging der Verfasser darüber hinaus weiter dahin, zu zeigen, dass es im Bezug auf die Beobachtung der...

Ermüdungsverhalten von hochfestem Beton unter Wasser

Julian Hümme
Das Ermüdungsverhalten von Beton ist sehr komplex, auch nach mehr als 100 Jahren Ermüdungsforschung existieren Wissenslücken, die eine sichere Beurteilung des Ermüdungswiderstands erschweren. Eine solche Wissenslücke stellt der Einfluss des Wassers auf den Ermüdungswiderstand von Beton dar. Bekannt ist nur, dass der Ermüdungswiderstand unter Wasser niedriger ausfällt als in trockener Umgebung. Welche Mechanismen dafür verantwortlich sind, ist unbekannt. Das Ziel dieser Dissertation ist die Charakterisierung des Ermüdungsverhaltens von hochfestem Beton unter Wasser. Darüber hinaus sollen...

Coupling Poisson rectangular pulse and multiplicative microcanonical random cascade models to generate sub-daily precipitation timeseries

Ina Pohle, Michael Niebisch, Hannes Müller, Sabine Schümberg, Tingting Zha, Thomas Maurer & Christoph Hinz
To simulate the impacts of within-storm rainfall variabilities on fast hydrological processes, long precipitation time series with high temporal resolution are required. Due to limited availability of observed data such time series are typically obtained from stochastic models. However, most existing rainfall models are limited in their ability to conserve rainfall event statistics which are relevant for hydrological processes. Poisson rectangular pulse models are widely applied to generate long time series of alternating precipitation events...

Characterization of an atom interferometer gravimeter with classical sensors for the use in geodesy and geophysics

Manuel Schilling, Christian Freier, Vladimir Schkolnik, Hartmut Wziontek, Hans-Georg Scherneck, Achim Peters & Jürgen Müller
Atom interferometers have demonstrated a high sensitivity to inertial forces. This enables their application in gravimetry, creating a new type of instrument for continuous absolute gravity measurements. The Gravimetric Atom Interferometer (GAIN, Humboldt-Universität Berlin) is a mobile atom interferometer based on interfering ensembles of laser-cooled Rb-87 atoms in an atomic fountain configuration. It has been specifically designed for on-site measurements of the absolute value of g as well as continuous recordings. High precision applications in...

Armut an Bildung : empirische Analysen und theoretische Rekonstruktionen

Eike Wolf
Die Leitproblematiken der vorliegenden kumulativen Dissertationsschrift sind im Schnittfeld von sozialwissenschaftlicher Bildungs- und Ungleichheitsforschung angesiedelt. Als thematischer Bezugspunkt dient ein gesellschaftlicher Problemzusammenhang, der sich unter dem Schlagwort Bildungsarmut in wissenschaftlichen und öffentlichen Diskurs gleichermaßen eingeschrieben hat. Diesem Problem wird empirisch nachgespürt, indem subjekttheoretisch und bildungsbiografisch orientierte Fallrekon-struktionen sowie diskurstheoretische Betrachtungen, die sich auf den zugehörigen wissenschaftlichen Bildungsarmuts-Diskurs beziehen, vorgenommen werden. Darüber hinaus widmet sich die Arbeit auch dem allgemeinen Diskurs um den Begriff, auf den...

Node of transport and place : dilemmas, challenges and potentialities towards the development of a mobility urban hub

Yara Baiardi
Die vorliegende Arbeit untersucht die räumlichen Dilemmata zwischen funktionalen Transportknoten und Aufenthaltsorten in der Stadt São Paulo. Metrostationen werden generell aufgrund der Verbindung von zwei oder mehr Transportlinien und durch ihre Funktion als lokale Zugänge zum städtischen Transportnetzwerk, als "Knoten" betrachtet. Diese Stationen können aber auch "Orte" sein, an denen Menschen Zugang zu mehreren Nichttransportfunktionen haben und Zeit im Stadtraum verbringen. Darüber hinaus geht die Arbeit von der Überlegung aus, daß die Bereiche der Stationen...

Development of multifunctional nanoparticles for drug delivery and bioimaging

Muharrem Seleci
The rapid development of nanotechnology has offered novel therapeutic and diagnostic strategies to overcome limitations of conventional therapy. Creation of the materials at nanometer scale and manipulation of their properties have enabled to employ them in a number of biological applications such as in controlled drug delivery and bioimaging. Within this thesis, the physical parameters for construction of multifunctional nanoparticles were summarized and the application potential of polymeric nanoparticles and liposomes as a drug carrier...

Advanced model updating strategies for structural dynamic systems

Karsten Schröder
In conjunction with increasing computational power, numerical models gained importance in virtually all engineering sciences during the last decades. Sophisticated modeling approaches are employed to simulate the physical behavior of the investigated structures for many practical problems. However, many of these models do not match with data measured in real-world structures to a certain degree. These inaccuracies are often caused by parameters needed for sophisticated modeling being imprecise, determined using engineering judgment or even completelyunknown....

Micro-canonical cascade model: Analyzing parameter changes in the future and their influence on disaggregation results

Hannes Müller, Annika Föt & Uwe Haberlandt
Rainfall time series with a high temporal resolution are needed in many hydrological and water resources management fields. Unfortunately, future climate projections are often available only in low temporal resolutions, e.g. daily values. A possible solution is the disaggregation of these time series using information of high-resolution time series of recording stations. Often, the required parameters for the disaggregation process are applied to future climate without any change, because the change is unknown. For this...

Generation of future high-resolution rainfall time series with a disaggregation model

Hannes Müller & Uwe Haberlandt
High-resolution rainfall data are needed in many fields of hydrology and water resources management. For analyzes of future rainfall condition climate scenarios exist with hourly values of rainfall. However, the direct usage of these data is associated with uncertainties which can be indicated by comparisons of observations and C20 control runs. An alternative is the derivation of changes of rainfall behavior over the time from climate simulations. Conclusions about future rainfall conditions can be drawn...

A stochastical event-based continuous time step rainfall generator based on Poisson rectangular pulse and microcanonical random cascade models

Ina Pohle, Michael Niebisch, Tingting Zha, Sabine Schümberg, Hannes Müller, Thomas Mauer & Christoph Hinz
Rainfall variability within a storm is of major importance for fast hydrological processes, e.g. surface runoff, erosion and solute dissipation from surface soils. To investigate and simulate the impacts of within-storm variabilities on these processes, long time series of rainfall with high resolution are required. Yet, observed precipitation records of hourly or higher resolution are in most cases available only for a small number of stations and only for a few years. To obtain long...

Negative results - the missing piece of scientific publishing

Andrea Popp, Tim Van Emmerik, Anna Solcerova, Hannes Müller & Rolf Hut
The current ‘publish or perish’ culture of our scientific system leads to a publication bias towards positive results (Curry, 2015). However, experimental failure in geosciences is the norm. Paradoxically, we typically do not share negative findings — defined as experiments giving results that do not confirm an accepted hypothesis or previous results, despite sound and careful experimental design, planning and execution — not even in informal settings. In the past, many great philosophers, including Popper...

Rainfall disaggregation for hydrological modeling: Is there a need for spatial consistence?

Hannes Müller, Markus Wallner, Kristian Förster & Uwe Haberlandt
Rainfall data with a high temporal resolution is required for rainfall-runoff modeling. Observed time series of this kind are short and can thus not be used in most cases. However, time series with daily resolution exist for longer periods and denser networks. The objective is to derive time series with a long duration and a high resolution by disaggregating time series of the non-recording stations with information of high-resolution time series. The multiplicative random cascade...

Temporal rainfall disaggregation: from point disaggregation to spatial rainfall

Hannes Müller & Uwe Haberlandt
Rainfall time series with a high temporal resolution are needed in many hydrological and water resources management fields. Observed time series of this kind are very short in most cases, so they cannot be used. Contrary to this, time series with lower temporal resolution (daily measurements) exists for much longer periods. The objective is to derive time series with a long duration and a high resolution by disaggregating time series of the non-recording stations with...

Rainfall disaggregation for urban hydrology: Effects of spatial consistence

Hannes Müller & Uwe Haberlandt
For urban hydrology rainfall time series with a high temporal resolution are crucial. Observed time series of this kind are very short in most cases, so they cannot be used. On the contrary, time series with lower temporal resolution (daily measurements) exist for much longer periods. The objective is to derive time series with a long duration and a high resolution by disaggregating time series of the non-recording stations with information of time series of...

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