Refine
Document Type
- Conference Proceeding (76)
- Doctoral Thesis (17)
- Article (12)
- Master's Thesis (3)
- Periodical (2)
- Study Thesis (2)
- Diploma Thesis (1)
- Report (1)
Institute
- In Zusammenarbeit mit der Bauhaus-Universität Weimar (50)
- Institut für Strukturmechanik (ISM) (17)
- Graduiertenkolleg 1462 (12)
- Professur Angewandte Mathematik (4)
- Junior-Professur Augmented Reality (3)
- Professur Informatik im Bauwesen (3)
- Professur Stochastik und Optimierung (3)
- An-Institute (2)
- Institut für Europäische Urbanistik (2)
- Institut für Konstruktiven Ingenieurbau (IKI) (2)
- Professur Betriebswirtschaftslehre im Bauwesen (2)
- Professur Grundbau (2)
- Professur Informatik in der Architektur (2)
- Professur Massivbau II (2)
- Professur Soziologie und Sozialgeschichte der Stadt (2)
- F. A. Finger-Institut für Baustoffkunde (FIB) (1)
- Geschichte und Theorie der Visuellen Kommunikation (1)
- Professur Baubetrieb und Bauverfahren (1)
- Professur Bodenmechanik (1)
- Professur Marketing und Medien (1)
- Professur Medienmanagement (1)
- Professur Mediensicherheit (1)
- Professur Stahlbau (1)
- Professur Systeme der Virtuellen Realität (1)
- Professur Verkehrsplanung und Verkehrstechnik (1)
Keywords
- Angewandte Mathematik (83)
- Angewandte Informatik (74)
- Architektur <Informatik> (74)
- Computer Science Models in Engineering; Multiscale and Multiphysical Models; Scientific Computing (74)
- Computerunterstütztes Verfahren (74)
- Strukturmechanik (9)
- Computersimulation (3)
- Stochastik (3)
- CAD (2)
- IFC (2)
- Kulturwissenschaft (2)
- Maschinelles Sehen (2)
- Medienwissenschaft (2)
- Public Private Partnership (2)
- Visualisierung (2)
- AES-192 (1)
- AES-256 (1)
- ARIA (1)
- Advanced Encryption Standard (1)
- BIM (1)
- BOT projects (1)
- Bauchemie (1)
- Baugrube (1)
- Bauplanung (1)
- Bauprozess (1)
- Bauökologie (1)
- Betonzusatzmittel (1)
- Bibliothek (1)
- Bilderkennung (1)
- Blockchiffre (1)
- Bluetooth tracking (1)
- Boolean Operations (1)
- Boolesche Operationen (1)
- Brasilien (1)
- Brazil (1)
- China (1)
- City Marketing (1)
- Clifford-Analysis (1)
- Collaboration (1)
- Computer Graphics (1)
- Computergraphik (1)
- Conformity Assessment (1)
- Darstellungssatz von Goursat (1)
- Decision Making (1)
- Differentielle Kryptoanalyse (1)
- Digital video compositing ; video projection ; digital video composition techniques (1)
- Direkte numerische Simul (1)
- E-Book (1)
- Ebener Dehnungszustand (1)
- Effizienz (1)
- Eignungstest (1)
- Elektronisches Buch (1)
- Emotion (1)
- Entscheidungsverhalten (1)
- Etabs (1)
- Experimentalplattform (1)
- Facility-Management (1)
- Filmproduktion (1)
- Florianópolis (1)
- Fourier (1)
- Fourier-Reihe (1)
- Freac (1)
- Funktionale Privatisierung (1)
- Funktionentheorie (1)
- Fügen (1)
- GTDS (1)
- Gefühl (1)
- Generative Entwurfsmethoden (1)
- Grindahl (1)
- Großtafelbau (1)
- HAS-160 (1)
- Handy (1)
- Hanoi (1)
- Hash-Algorithmus (1)
- Hedonic Consumption (1)
- Hochhaus (1)
- Hubbard (1)
- Hydraulischer Grundbruch (1)
- Hyperkomplexe Funktion (1)
- Image (1)
- Immersion <Virtuelle Realität> (1)
- Immobilien-Lebenszyklusansatz (1)
- Immobilienmanagement (1)
- Interaction Techniques (1)
- Internalisierung <Wirtschaft> (1)
- Jena-Winzerla (1)
- Jena-Winzerla / Stadtteilbüro Winzerla (1)
- Karl (1)
- Kleben (1)
- Klebtechnologie (1)
- Konformitätsbewertung (1)
- Kontextbezogenes System (1)
- Konzessionen (1)
- Kraftschluss (1)
- Krankenhaus-Immobilien (1)
- Krankenhausfinanzierung (1)
- Kryptoanalyse (1)
- Kryptologie (1)
- Kunststoffkleben (1)
- Laidlaw (1)
- Landnutzung (1)
- Laurent (1)
- Laurent-Reihe (1)
- Lebensdauer (1)
- Leseverhalten (1)
- Lineare Elastizitätstheorie (1)
- Lumineszenzdiode (1)
- MFPA Weimar (1)
- MIPS-Konzept (1)
- Make-up Urbanism (1)
- Make-up-Urbanistik (1)
- Marketing (1)
- Marktstruktur (1)
- Mechanik (1)
- Media Goods (1)
- Medienphilosophie (1)
- Meso-Scale (1)
- Metallkleben (1)
- Mikro-Scale (1)
- Mobile Computing (1)
- Model Predictive Control (1)
- Modellierung (1)
- Museumsführer (1)
- Nachfragerisiko (1)
- Oberflächenvorbereitung (1)
- Perkolationstheorie (1)
- Philosophie (1)
- PhoneGuide (1)
- Phung Khoang (1)
- Planungstheorie (1)
- Polaritätsprofil (1)
- Polykristall (1)
- Positionsbestimmung (1)
- Produktmodell (1)
- Projector Camera System (1)
- Public Private Partnership (PPP) (1)
- RadioGatun (1)
- Ressourcenanalyse (1)
- Risikoallokation (1)
- Risikomanagement (1)
- Risikoverteilung (1)
- SHACAL-2 (1)
- Schwinden (1)
- Schwindisotherme (1)
- Schwindmechanismus (1)
- Schwindreduktion (1)
- Schwingungsdämpfer (1)
- Siedlung (1)
- Siedlungsbau (1)
- Simulation (1)
- Softwareentwicklung (1)
- Sorptionsisotherme (1)
- Soziale Kosten (1)
- Soziale Stadt <Förderungsprogramm> (1)
- Stadtmarketing (1)
- Stadtplanung (1)
- Standsicherheit (1)
- Straßenbenutzungsgebühr (1)
- Straßensektor (1)
- Strukturalismus (1)
- Städtebau (1)
- Suffosion (1)
- TMD (1)
- Taylor (1)
- Taylor-Reihe (1)
- Technikphilosophie (1)
- Terzaghi (1)
- Tiefe Baugruben (1)
- Tiger (1)
- Trabantenstadt (1)
- Traffic revenue risk (1)
- Tragsystem (1)
- Tuned Mass Damper (1)
- Ubiquitous Computing (1)
- Ungesättigte Zone (1)
- Unsaturated soil (1)
- Verbindungstechnik (1)
- Verbraucherverhalten (1)
- Verkehrsmengenrisiko (1)
- Verkehrspolitik (1)
- Verkehrswirtschaft (1)
- Verlag (1)
- Virtual Reality (1)
- Virtuelle Realität (1)
- Visually Impaired (1)
- Visuelle Effekte ; virtuelles Studio ; digitale Videokomposition (1)
- Wegrouten (1)
- Weimar / Bauhaus-Universität / Professur Baubetrieb und Bauverfahren (1)
- Wertschöpfung (1)
- Zementhydratation (1)
- Zugversuch (1)
- adhesive bonding (1)
- atomistic simulation methods (1)
- biaxial – sand (1)
- biaxial-sand (1)
- block ciphers (1)
- computerbasiertes Entwerfen (1)
- construction chemicals (1)
- continuum mechanics (1)
- crack mitigation (1)
- demand risk (1)
- differential cryptanalysis (1)
- digitales Gebäudemodell (1)
- ecological architecture (1)
- external costs (1)
- fiber reinforced polymer (1)
- finite element method (1)
- force-fit (1)
- fracture behavior (1)
- generalized Kolosov-Muskhelishvili formulae (1)
- generalized theorem of Goursat (1)
- hash function (1)
- intergranular damage (1)
- joining (1)
- land use management (1)
- life cycle management (1)
- lösbare Verbindung (1)
- material properties (1)
- materialgerecht (1)
- modelling (1)
- modulares Bauwerk (1)
- monogene Orthogonalreihenentwicklungen (1)
- monogenic orthogonal series expansions Fourier (1)
- museum guidance system (1)
- numeric analysis (1)
- pathway awareness (1)
- percolation theory (1)
- plane-strain conditions (1)
- public space (1)
- puplic hospital (1)
- quasicontinuum method (1)
- risk allocation (1)
- road pricing (1)
- scale transition (1)
- schwindreduzierendes Zusatzmittel (1)
- shrinkage (1)
- shrinkage reducing admixtures (1)
- shrinkage reducing agents (1)
- shrinkage reduction (1)
- simulation (1)
- slide attacks (1)
- space syntax (1)
- suffusion (1)
- toll road concessions (1)
- urban building (1)
- urban design (1)
- urban planning (1)
- verallgemeinerte Kolosov-Muskhelishvili Formeln (1)
- Öffentlich Private Partnerschaft (ÖPP) (1)
- Öffentlicher Raum (1)
Year of publication
- 2010 (114) (remove)
Besides home entertainment and business presentations, video projectors are powerful tools for modulating images spatially as well as temporally. The re-evolving need for stereoscopic displays increases the demand for low-latency projectors and recent advances in LED technology also offer high modulation frequencies. Combining such high-frequency illumination modules with synchronized, fast cameras, makes it possible to develop specialized high-speed illumination systems for visual effects production. In this thesis we present different systems for using spatially as well as temporally modulated illumination in combination with a synchronized camera to simplify the requirements of standard digital video composition techniques for film and television productions and to offer new possibilities for visual effects generation. After an overview of the basic terminology and a summary of related methods, we discuss and give examples of how modulated light can be applied to a scene recording context to enable a variety of effects which cannot be realized using standard methods, such as virtual studio technology or chroma keying. We propose using high-frequency, synchronized illumination which, in addition to providing illumination, is modulated in terms of intensity and wavelength to encode technical information for visual effects generation. This is carried out in such a way that the technical components do not influence the final composite and are also not visible to observers on the film set. Using this approach we present a real-time flash keying system for the generation of perspectively correct augmented composites by projecting imperceptible markers for optical camera tracking. Furthermore, we present a system which enables the generation of various digital video compositing effects outside of completely controlled studio environments, such as virtual studios. A third temporal keying system is presented that aims to overcome the constraints of traditional chroma keying in terms of color spill and color dependency. ...
This thesis focuses on the cryptanalysis and the design of block ciphers and hash func- tions. The thesis starts with an overview of methods for cryptanalysis of block ciphers which are based on differential cryptanalysis. We explain these concepts and also sev- eral combinations of these attacks. We propose new attacks on reduced versions of ARIA and AES. Furthermore, we analyze the strength of the internal block ciphers of hash functions. We propose the first attacks that break the internal block ciphers of Tiger, HAS-160, and a reduced round version of SHACAL-2. The last part of the thesis is concerned with the analysis and the design of cryptographic hash functions. We adopt a block cipher attack called slide attack into the scenario of hash function cryptanalysis. We then use this new method to attack different variants of GRINDAHL and RADIOGATUN. Finally, we propose a new hash function called TWISTER which was designed and pro- posed for the SHA-3 competition. TWISTER was accepted for round one of this com- petition. Our approach follows a new strategy to design a cryptographic hash function. We also describe several attacks on TWISTER and discuss the security issues concern- ing these attack on TWISTER.
Die vorliegende Arbeit beschäftigt sich mit der geometrischen Suffosionsbeständigkeit von Erdstoffen. Mit dem wahrscheinlichkeitstheoretischen Ansatz der Perkolationstheorie wurde ein analytisches Verfahren gewählt, mit dem suffosive Materialtransportprozesse modelliert und quantifiziert werden können. Mit dem verwendeten Perkolationsmodell wurde eine beliebige Porenstruktur eines realen Erdstoffes im 3-Dimensionalen modelliert. Mögliche Materialtransportprozesse innerhalb der modellierten Porenstruktur wurden anschließend simuliert. Allgemein gültige Gesetzmäßigkeiten wurden hergeleitet und Grenzbedingungen formuliert. Diese sind vom Erdstoff unabhängig und beschreiben Zusammenhänge zwischen Materialtransport und Porenstruktur. Anwendbar sind diese Ergebnisse auf homogene, isotrope und selbstähnliche Erdstoffgefüge. Aussagen über konkrete Erdstoffe können über die Transformationsmethode erfolgen. Für die Verwendung der Transformationsmethode ist vorab die relevante Porenstruktur, d. h. die Porenengstellenverteilung, zu ermitteln.
The numerical simulation of damage using phenomenological models on the macroscale was state of the art for many decades. However, such models are not able to capture the complex nature of damage, which simultaneously proceeds on multiple length scales. Furthermore, these phenomenological models usually contain damage parameters, which are physically not interpretable. Consequently, a reasonable experimental determination of these parameters is often impossible. In the last twenty years, the ongoing advance in computational capacities provided new opportunities for more and more detailed studies of the microstructural damage behavior. Today, multiphase models with several million degrees of freedom enable for the numerical simulation of micro-damage phenomena in naturally heterogeneous materials. Therewith, the application of multiscale concepts for the numerical investigation of the complex nature of damage can be realized. The presented thesis contributes to a hierarchical multiscale strategy for the simulation of brittle intergranular damage in polycrystalline materials, for example aluminum. The numerical investigation of physical damage phenomena on an atomistic microscale and the integration of these physically based information into damage models on the continuum meso- and macroscale is intended. Therefore, numerical methods for the damage analysis on the micro- and mesoscale including the scale transfer are presented and the transition to the macroscale is discussed. The investigation of brittle intergranular damage on the microscale is realized by the application of the nonlocal Quasicontinuum method, which fully describes the material behavior by atomistic potential functions, but reduces the number of atomic degrees of freedom by introducing kinematic couplings. Since this promising method is applied only by a limited group of researchers for special problems, necessary improvements have been realized in an own parallelized implementation of the 3D nonlocal Quasicontinuum method. The aim of this implementation was to develop and combine robust and efficient algorithms for a general use of the Quasicontinuum method, and therewith to allow for the atomistic damage analysis in arbitrary grain boundary configurations. The implementation is applied in analyses of brittle intergranular damage in ideal and nonideal grain boundary models of FCC aluminum, considering arbitrary misorientations. From the microscale simulations traction separation laws are derived, which describe grain boundary decohesion on the mesoscale. Traction separation laws are part of cohesive zone models to simulate the brittle interface decohesion in heterogeneous polycrystal structures. 2D and 3D mesoscale models are presented, which are able to reproduce crack initiation and propagation along cohesive interfaces in polycrystals. An improved Voronoi algorithm is developed in 2D to generate polycrystal material structures based on arbitrary distribution functions of grain size. The new model is more flexible in representing realistic grain size distributions. Further improvements of the 2D model are realized by the implementation and application of an orthotropic material model with Hill plasticity criterion to grains. The 2D and 3D polycrystal models are applied to analyze crack initiation and propagation in statically loaded samples of aluminum on the mesoscale without the necessity of initial damage definition.
Energie-basierte Auslegung von Tragsystemen für Hochhäuser in Abhängigkeit von der Größenordnung
(2010)
Angelehnt an Entwicklungen des aktuellen Hochhausbaus, die Gebäudehöhen von über 600 m vorsehen, behandelt die vorliegende Arbeit Möglichkeiten der Konzeption von Aussteifungssystemen. Ein ausgewähltes Tragwerk aus Stahlbetonschubwänden und einer Höhe von 800 m wird mit der 3D-Analyse-Software ETABS (Version 9.0.9) bemessen. Dieses Tragwerk wird mit extremen Einwirkungen infolge Wind und Erdbeben belastet. Da ein solch hohes Gebäude außerhalb der Anwendungsgrenzen internationaler Normen liegt, wird ein eigener Ansatz für den Lastfall Wind zur Analyse des Schwingungsverhaltens gewählt. Aufbauend auf den Ergebnissen der Analyse werden Möglichkeiten der Reduktion bzw. Dämpfung von kritischen Gebäudeschwingungen diskutiert. Die konkrete Dämpfungsvariante „Passiver Schwingungsdämpfer“ (Tuned Mass Damper) wird, unter Verwendung von Optimierungskriterien, in ETBAS modelliert und in die Berechnungen eingebunden. Dieses Tragwerk wird zwei kleineren Tragwerken (H = 200 m bzw. 400 m) gegenübergestellt und mittels dem MIPS-Konzept (Material-Input pro Serviceeinheit) analysiert. Ziel ist es dabei, qualitative Aussagen zur Nachhaltigkeit und ökologischer Effizienz besonders hoher Gebäude zu treffen.
Die vorliegende Arbeit beschäftigt sich mit der vergleichenden Analyse unterschiedlicher Berechnungsansätze zum hydraulischen Grundbruch. Diese wurden zunächst analysiert, an Beispielberechnungen angewandt und schließlich miteinander verglichen. Weiterhin wurde der Einfluss verschiedener Randbedingungen, allem voran der Baugrubenbreite, auf die Sicherheit gegen einen hydraulischen Grundbruch untersucht. Es werden Empfehlungen zur Anwendbarkeit verschiedener Näherungsansätze bei Vorhandensein bestimmter Einflussfaktoren gegeben.
One of the main focuses of recent Chinese urban development is the creation and retrofitting of public spaces driven by the market force and demand. However, researches concerning human and cultural influences on shaping public spaces have been scanty. There still exist many undefined ambiguous planning aspects institutionally and legislatively. This is an explanatory research to address interactions, incorporations and interrelationship between the lived environment and its peoples. It is knowledge-seeking and normative. Theoretically, public space in a Chinese context is conceptualized; empirically, a selected case is inquired. The research has unfolded a comparatively complete understanding of China’s planning evolution and on-going practices. Data collection emphasizes the concept of ‘people’ and ‘space’. First-hand data is derived from the intensive fieldwork and observatory and participatory documentations. The ample detailed authentic empirical data empowers space syntax as a strong analysis tool in decoding how human’s activities influence the public space. Findings fall into two categories but interdependent. Firstly, it discloses the studied settlement as a generic, organic and incremental development model. Its growth and established environment is evolutionary and incremental, based on its intrinsic traditions, life values and available resources. As a self-sustaining settlement, it highlights certain vernacular traits of spatial development out of lifestyles and cultural practices. Its spatial articulation appears as a process parallel to socio-economic transitions. Secondly, crucial planning aspects are theoretically summarized to address the existing gap between current planning methodology and practicalities. It pinpoints several most significant and particular issues, namely, disintegrated land use system and urban planning; missing of urban design in the planning system, loss of a human-responsive environment resulted from standardized planning and under-estimation of heritage in urban development. The research challenges present Chinese planning laws and regulations through urban public space study; and pinpoints to yield certain growth leverage for planning and development. Thus, planning is able to empower inhabitants to make decisions along the process of shaping and sustaining their space. Therefore, it discusses not only legislative issues, concerning land use planning, urban design and heritage conservation. It leads to a pivotal proposal, i.e., the integration of human and their social spaces in formulating a new spatial strategy. It expects to inform policymakers of underpinning social values and cultural practices in reconfiguring postmodern Chinese spatiality. It propounds that social context endemic to communities shall be integrated as a crucial tool in spatial strategy design, hence to strengthen spatial attributes and improve life quality.
Der Siedlungsbau in Hanoi kan heutzutage - über 20 Jahre nach dem Beginn der Renovierungspolitik udn der Markwirtschaft, die dem Städtebau eine große Gelegenheit zur Verbesserung gegeben haben - zurückblickend und eingeschätz werden. Die letzten 20 Jahre sind eine kurze Zeit in der tausendjährigen Geschichte der Stadt, trotzdem entwickelte sich die Stadt in diesem Zeitraum am schnellsten und auch am problematischten aus Sicht der Umwelt. Ohne eine passende Entwicklungsstategie oder eine geeignete Maßnahme bei der Stadtplanung vergrößert sich der Konflikt Ökonomie - Ökologie immer weiter. ... Die Findung eines neuen Wohnkonzeptes im Gleichgewicht zwischen Ökonomie und der Ökologie ist eine hochaktuelle Frage geworden.
Virtual reality systems offer substantial potential in supporting decision processes based purely on computer-based representations and simulations. The automotive industry is a prime application domain for such technology, since almost all product parts are available as three-dimensional models. The consideration of ergonomic aspects during assembly tasks, the evaluation of humanmachine interfaces in the car interior, design decision meetings as well as customer presentations serve as but a few examples, wherein the benefit of virtual reality technology is obvious. All these tasks require the involvement of a group of people with different expertises. However, current stereoscopic display systems only provide correct 3D-images for a single user, while other users see a more or less distorted virtual model. This is a major reason why these systems still face limited acceptance in the automotive industry. They need to be operated by experts, who have an advanced understanding of the particular interaction techniques and are aware of the limitations and shortcomings of virtual reality technology. The central idea of this thesis is to investigate the utility of stereoscopic multi-user systems for various stages of the car development process. Such systems provide multiple users with individual and perspectively correct stereoscopic images, which are key features and serve as the premise for the appropriate support of collaborative group processes. The focus of the research is on questions related to various aspects of collaboration in multi-viewer systems such as verbal communication, deictic reference, embodiments and collaborative interaction techniques. The results of this endeavor provide scientific evidence that multi-viewer systems improve the usability of VR-applications for various automotive scenarios, wherein co-located group discussions are necessary. The thesis identifies and discusses the requirements for these scenarios as well as the limitations of applying multi-viewer technology in this context. A particularly important gesture in real-world group discussions is referencing an object by pointing with the hand and the accuracy which can be expected in VR is made evident. A novel two-user seating buck is introduced for the evaluation of ergonomics in a car interior and the requirements on avatar representations for users sitting in a car are identified. Collaborative assembly tasks require high precision. The novel concept of a two-user prop significantly increases the quality of such a simulation in a virtual environment and allows ergonomists to study the strain on workers during an assembly sequence. These findings contribute toward an increased acceptance of VR-technology for collaborative development meetings in the automotive industry and other domains.
The advent of high-performance mobile phones has opened up the opportunity to develop new context-aware applications for everyday life. In particular, applications for context-aware information retrieval in conjunction with image-based object recognition have become a focal area of recent research. In this thesis we introduce an adaptive mobile museum guidance system that allows visitors in a museum to identify exhibits by taking a picture with their mobile phone. Besides approaches to object recognition, we present different adaptation techniques that improve classification performance. After providing a comprehensive background of context-aware mobile information systems in general, we present an on-device object recognition algorithm and show how its classification performance can be improved by capturing multiple images of a single exhibit. To accomplish this, we combine the classification results of the individual pictures and consider the perspective relations among the retrieved database images. In order to identify multiple exhibits in pictures we present an approach that uses the spatial relationships among the objects in images. They make it possible to infer and validate the locations of undetected objects relative to the detected ones and additionally improve classification performance. To cope with environmental influences, we introduce an adaptation technique that establishes ad-hoc wireless networks among the visitors’ mobile devices to exchange classification data. This ensures constant classification rates under varying illumination levels and changing object placement. Finally, in addition to localization using RF-technology, we present an adaptation technique that uses user-generated spatio-temporal pathway data for person movement prediction. Based on the history of previously visited exhibits, the algorithm determines possible future locations and incorporates these predictions into the object classification process. This increases classification performance and offers benefits comparable to traditional localization approaches but without the need for additional hardware. Through multiple field studies and laboratory experiments we demonstrate the benefits of each approach and show how they influence the overall classification rate.
Am 25. März 2010 veranstaltete die Professur Baubetrieb und Bauverfahren im Rahmen der jährlich stattfindenden baubetrieblichen Tagungsreihe gemeinsam mit der Arbeitsgruppe „Unikatprozesse“ in der Fachgruppe „Simulation in Produktion und Logistik“ (SPL) im Rahmen der Arbeitsgemeinschaft Simulation – ASIM einen ganztägigen Workshop mit dem Titel: „Modellierung von Prozessen zur Fertigung von Unikaten“. Viele Bauprozesse sind dadurch gekennzeichnet, dass sie Unikatcharakter besitzen. Unikate sind durch prototypische Einmaligkeit, Individualität, vielfältige Randbedingungen, einen geringen Grad an Standardisierung und Wiederholungen gekennzeichnet. Das erschwert die realitätsnahe Modellierung zur Simulation sogenannter Unikatprozesse. Dieser Besonderheit widmet sich die überwiegende Zahl der Tagungsbeiträge, die in diesem Band widergegeben sind.
In this dissertation, a new, unique and original biaxial device for testing unsaturated soil was designed and developed. A study on the mechanical behaviour of unsaturated sand in plane-strain conditions using the new device is presented. The tests were mainly conducted on Hostun sand specimens. A series of experiments including basic characterisation, soil water characteristic curves, and compression biaxial tests on dry, saturated, and unsaturated sand were conducted. A set of bearing capacity tests of strip model footing on unsaturated sand were performed. Additionally, since the presence of fine content (i.e., clay) influences the behavior of soils, soil water characteristic tests were also performed for sand-kaolin mixtures specimens.
Die Behandlung von geometrischen Singularitäten bei der Lösung von Randwertaufgaben der Elastostatik stellt erhöhte Anforderungen an die mathematische Modellierung des Randwertproblems und erfordert für eine effiziente Auswertung speziell angepasste Berechnungsverfahren. Diese Arbeit beschäftigt sich mit der systematischen Verallgemeinerung der Methode der komplexen Spannungsfunktionen auf den Raum, wobei der Schwerpunkt in erster Linie auf der Begründung des mathematischen Verfahrens unter besonderer Berücksichtigung der praktischen Anwendbarkeit liegt. Den theoretischen Rahmen hierfür bildet die Theorie quaternionenwertiger Funktionen. Dementsprechend wird die Klasse der monogenen Funktionen als Grundlage verwendet, um im ersten Teil der Arbeit ein räumliches Analogon zum Darstellungssatz von Goursat zu beweisen und verallgemeinerte Kolosov-Muskhelishvili Formeln zu konstruieren. Im Hinblick auf die vielfältigen Anwendungsbereiche der Methode beschäftigt sich der zweite Teil der Arbeit mit der lokalen und globalen Approximation von monogenen Funktionen. Hierzu werden vollständige Orthogonalsysteme monogener Kugelfunktionen konstruiert, infolge dessen neuartige Darstellungen der kanonischen Reihenentwicklungen (Taylor, Fourier, Laurent) definiert werden. In Analogie zu den komplexen Potenz- und Laurentreihen auf der Grundlage der holomorphen z-Potenzen werden durch diese monogenen Orthogonalreihen alle wesentlichen Eigenschaften bezüglich der hyperkomplexen Ableitung und der monogenen Stammfunktion verallgemeinert. Anhand repräsentativer Beispiele werden die qualitativen und numerischen Eigenschaften der entwickelten funktionentheoretischen Verfahren abschließend evaluiert. In diesem Kontext werden ferner einige weiterführende Anwendungsbereiche im Rahmen der räumlichen Funktionentheorie betrachtet, welche die speziellen Struktureigenschaften der monogenen Potenz- und Laurentreihenentwicklungen benötigen.
Visually impaired is a common problem for human life in the world wide. The projector-based AR technique has ability to change appearance of real object, and it can help to improve visibility for visually impaired. We propose a new framework for the appearance enhancement with the projector camera system that employed model predictive controller. This framework enables arbitrary image processing such as photo-retouch software in the real world and it helps to improve visibility for visually impaired. In this article, we show the appearance enhancement result of Peli's method and Wolffshon's method for the low vision, Jefferson's method for color vision deficiencies. Through experiment results, the potential of our method to enhance the appearance for visually impaired was confirmed as same as appearance enhancement for the digital image and television viewing.