Liste der Fachpublikationen

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Flach, Guntram; Frenzel, Chathy

10. Rostocker eGovernment-Forum 2015 - Kooperatives eGovernment: Erfolg durch Zusammenarbeit

2015

Rostocker eGovernment-Forum <10, 2015, Rostock-Warnemünde, Germany>

Die flexible Automatisierung von Ämterübergreifenden Verwaltungsprozessen stellt eine neue Herausforderung für den Einsatz von IT-Technologien hinsichtlich Komplexität, Integration, Rechtsverbindlichkeit und Datensicherheit dar. Zum anderen präsentieren öffentliche Verwaltungen fast täglich neue Serviceleistungen wie Informations-, Kommunikations- und Transaktionsdienste via Internet, die eine neue Qualität von Bürgerservice mit sich bringen. Zunehmende Bedeutung kommt dabei der Kooperation und dem Einsatz interoperabler Services zur Steuerung und Integration von Institutions- und Ebenen-übergreifender Verwaltungsprozessen zu. Eine standardisierte, technologische Ausrichtung ist dabei von ebenso großer Wichtigkeit wie die Einbeziehung von Synergie-Effekten durch die Bildung von Netzwerken und Kooperationen. Vor diesem Hintergrund verfolgt das 10. Rostocker eGovernment-Forum das Ziel, anhand von Fachvorträgen und Praxisbeispielen neuartige Konzepte und Lösungen aus den Themenbereichen Kommunales und interkommunales eGovernment, Dienste und Services in kollaborativen Umgebungen, Interoperabilität und europäische Vernetzung, mobile Anwendungen und Fachverfahren in der öffentlichen Verwaltung vorzustellen und Gelegenheit zu einem Gedanken- und Erfahrungsaustausch zu schaffen.

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Guidi, Gabriele; Scopigno, Roberto; Torres, Juan Carlos; Graf, Holger

2015 Digital Heritage International Congress. Volume 1

2015

Digital Heritage International Congress (DH) <2015, Granada, Spain>

<b>Digitization and Acquisition</b> - Photogrammetry & image-based modeling - 3D scanning & digitization (laser, structured light, motion capture, etc.) - Remote sensing and Aerial Laser Scanning (ALS) - GNSS (GPS, GLONASS, Galileo) - Advanced 2Ddocument scanning - Low-cost & gaming 3D input - Ultra-high resolution & HDR photography - Terahertz, Infrared, UV & X-ray imaging - Advanced sensors research - Heritage diagnostics <b>Computer Graphics and Interaction</b> - Immersive and Active/Passive stereo-displays - Augmented displays - Real + virtual worlds (mixed/augmented reality) - Virtualization of other senses (touch, taste, smell, sound) - Haptic & Multimodal interaction - Distributed VR - Local/remote rendering - Innovative interaction systems - Tools for Storytelling and Serious Games - Tools for multimedia or museums installations - Usability, effectiveness and interface design - Visual simulation of materials - Emerging visualization technologies - Surface reconstruction from sampled 3D data - Multiresolution 3D modelling and rendering methods - Interactive visualization of very large 3D models in low-end and mobile devices

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Guidi, Gabriele; Scopigno, Roberto; Torres, Juan Carlos; Graf, Holger

2015 Digital Heritage International Congress. Volume 2

2015

Digital Heritage International Congress (DH) <2015, Granada, Spain>

<b>Analysis and Interpretation</b> - Historic Document Analysis - Remote Sensing Analysis (including visible, multispectral and radar images) - Finite element, structural and other analyses - 3D modeling (CAD-based and reality-based) - Building Information Modeling (BIM) - Virtual Reconstruction Issues - Realism and Interpretation in CH - 3D, multimedia and GIS repositories, platforms, & info systems - Digital Curation and Museology - Virtual GIS and Mapping tools - Integrated interpretation of diagnostic sensors <b>Theory, Methodologies, Preservation and Standards</b> - Metadata Handling & Management - Digital libraries - Heritage Commons - Cultural Analytics - Heritage at Risk - Cognitive Sciences and Interaction - Digital Humanities - Text Markup / Analysis - Born digital content issues - Digital Rights Management - Trusted digital repositories / OAIS - Institutional Repositories - Semantic Web in CH - New Economical Models for Digital Heritage - Long term storage and persistence - Requirements and policies for Preservation - Data formats and compression for preservation <b>Digital Heritage Projects and Applications - Integrated solutions and best practices in:</b> - Virtual documentation - Virtual heritage conservation - Virtual restoration - Virtual archaeology - Virtual museums - Virtual Exhibitions - Serious Games for heritage - Collaborative environments - Internet technologies and social media - Digital documentation for conservation

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3D beyond CAD - Supporting the Lifecycle of Maritime Assets with Lightweight 3D Formats and Lightweight Application Provisioning

2015

Lukas, Uwe von (Ed.) et al.: Go-3D 2015: Computergraphik für die Praxis : Tagungsband zur Konferenz Go-3D 2015. Stuttgart: Fraunhofer Verlag, 2015, pp. 23-37

Go-3D <7, 2015, Rostock, Germany>

3D models play an important role in the design of a maritime asset and contain most of the information which is necessary to drive production. A survey conducted in the German maritime industry underpins the enormous heterogeneity in 3D tools and formats. Together with various other technical and organizational challenges, the usage of 3D models is not as efficient and established in the product lifecycle as it could be. The author presents a lightweight approach where the accurate 3D geometry is replaced by a visualization model which has a small footprint and much less sensitive data compared to the original CAD model. This derived model offers the chance to improve usage of 3D data over the whole lifecycle of maritime assets.

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Lukas, Uwe von; Staack, Ingo; Köhler, V.

3D Maritim - Supporting Technology Transfer for 3D Graphics

2015

ICCAS 2015 : 17th International Conference on Computer Applications in Shipbuilding. London: The Royal Institution of Naval Architects, 2015, pp. 215-222

International Conference on Computer Applications in Shipbuilding (ICCAS) <17, 2015, Bremen, Germany>

Innovation is a constant challenge for the companies acting in a global maritime market. Especially IT has proven to play an important role as an innovation driver by streamlining business processes and increasing productivity in nearly all industry sectors. However, selecting and adapting the most promising IT innovations is per se a challenge. For this reason it is a proven concept to build networks or clusters of stakeholders from different disciplines in a given region and for a given topic. By establishing a constant level of technology transfer and collaboration, the companies can reduce their risk and effort and increase their ability for innovation. The forum 3D maritime forms such a network that is located in Northern Germany and dedicated to novel applications of 3D technology in the maritime sector. The paper introduces the role of 3D graphics, presents 3D maritime at a glance and gives an overview over selected results of the forum.

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Getto, Roman; Fellner, Dieter W.

3D Object Retrieval with Parametric Templates

2015

Pratikakis, Ioannis (Ed.) et al.: Eurographics 2015 Workshop on 3D Object Retrieval : EG 3DOR 2015. Goslar: Eurographics Association, 2015. (Eurographics Workshop and Symposia Proceedings Series), pp. 47-54

Eurographics Workshop on 3D Object Retrieval (EG 3DOR) <8, 2015, Zurich, Switzerland>

We propose a 3D object retrieval system which uses parametric templates as prior knowledge for the retrieval. A parametric template represents an object-domain and a semantic concept like 'chair' or 'plane' or a more specific concept like 'dining-char' or 'biplane'. The template can be specified at a general or specific level and can even equal actual retrieved objects. The parametric template is composed of several input parameters and an operation chain which constructs an object. Different parameter combinations lead to different object instances. We combine and evaluate a paramteric template with different descriptors. Our results show that the usage of parametric templates can raise the retrieval performance significantly.

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3D-Massendigitalisierung - ein Meilenstein für die museale Nutzung

2015

Museumskunde, Vol.80 (2015), 1, pp. 58-61

Seit mehr als einem Jahrzehnt gibt es umfangreiche Maßnahmen zur digitalen Verarbeitung und Visualisierung von Sammlungsbeständen. So sind die EU-Mitgliedstaaten noch Empfehlungen der Europäischen Kommission im Rahmen der Digitalen Agenda aufgefordert, Digitalisierung, Online-Verfügbarkeit und digitale Erhaltung von historischem Material voranzutreiben. Auch die Reflexionsgruppe zur "Digitalisierung des kulturellen Erbes in Europa" erwartet unter Hinweis auf dessen wirtschaftliches Potenzial eine "neue Renaissance" durch Zusammenführung von Beständen im Netz. Während vor diesem Hintergrund die digitale Aufbereitung von Kulturgut in 2D längst zur Kernaufgabe von Bibliotheken, Archiven und Museen gehört, ist die 3D-Digitalisierung von dreidimensionalen Artefakten aufgrund ihrer komplexeren Form noch immer eine Herausforderung. Aufgrund des hohen Kosten- und Zeitaufwands konzentrieren sich hier Maßnahmen auf prestigeträchtige Einzelobjekte statt auf ganze Sammlungen. Denn es existieren bisher keine kommerziell verfügbaren Technologien zur effizienten und hochpräzisen Massendigitalisierung in 3D. Auch bleibt die 3D-Digitalisierung in den wenigen existenten Digitalisierungs- und Erhaltungsstrategien von musealen Einrichtungen noch immer unberücksichtigt. Erst jüngst wurden die DFG-Praxisregeln zur Digitalisierung dahingehend überarbeitet, unter dem Begriff nicht mehr ausschließlich die digitale Fotografie zu verstehen. In der aktualisierten Version wird zwischen der digitalen Repräsentation eines dreidimensionalen Objekts und dessen digitaler Replik unterschieden. Ersteres stellt eine ,,fotografische Erfassung aller relevanten visuellen Eigenschaften des Objekts, meist von mehr als einem Aufnahmestandpunkt" dar. Eine digitale Replik hingegen ist eine "originalgetreue Rekonstruktion seiner Form und Oberflächen-Licht-lnteraktion", also ein digitales 3D-Modell samt Hülle und Anmutung.

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3DHOG for Geometric Similarity Measurement and Retrieval for Digital Cultural Heritage Archives

2015

Guidi, Gabriele (Ed.) et al.: 2015 Digital Heritage International Congress. Volume 2. New York: The Institute of Electrical and Electronics Engineers (IEEE), 2015, pp. 117-120

Digital Heritage International Congress (DH) <2015, Granada, Spain>

With projects such as CultLab3D, 3D Digital preservation of cultural heritage will become more affordable and with this, the number of 3D-models representing scanned artefacts will dramatically increase. However, once mass digitization is possible, the subsequent bottleneck to overcome is the annotation of cultural heritage artefacts with provenance data. Current annotation tools are mostly based on textual input, eventually being able to link an artefact to documents, pictures, videos and only some tools already support 3D models. Therefore, we envisage the need to aid curators by allowing for fast, web-based, semi-automatic, 3D-centered annotation of artefacts with metadata. In this paper we give an overview of various technologies we are currently developing to address this issue. On one hand we want to store 3D models with similarity descriptors which are applicable independently of different 3D model quality levels of the same artefact. The goal is to retrieve and suggest to the curator metadata of already annotated similar artefacts for a new artefact to be annotated, so he can eventually reuse and adapt it to the current case. In addition we describe our web-based, 3D-centered annotation tool with meta- and object repositories supporting various databases and ontologies such as CIDOC-CRM.

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Scully, Timothy; Doboz, Jozef; Sturm, Timo; Jung, Yvonne

3drepo.io: Building the Next Generation Web3D Repository with AngularJS and X3DOM

2015

ACM SIGGRAPH: Proceedings Web3D 2015 : 20th International Conference on 3D Web Technology. New York: ACM, 2015, pp. 235-243

International Conference on 3D Web Technology (WEB3D) <20, 2015, Heraklion, Crete, Greece>

This paper presents a novel open source web-based 3D version control system positioned directly within the context of the recent strategic plan for digitising the construction sector in the United Kingdom. The aim is to achieve reduction of cost and carbon emissions in the built environment by up to 20% simply by properly managing digital information and 3D models. Even though previous works in the field concentrated mainly on defining novel WebGL frameworks and later on the efficiency of 3D data delivery over the Internet, there is still the emerging need for a practical solution that would provide ubiquitous access to 3D assets, whether it is for large international enterprises or individual members of the general public. We have, therefore, developed a novel platform leveraging the latest open web-based technologies such as AngularJS and X3DOM in order to define an industrial-strength collaborative cloud hosting service 3drepo.io. Firstly, we introduce the work and outline the high-level system architecture as well as improvements in relation to previous work. Next, we describe database and frontend considerations with emphasis on scalability and enhanced security. Finally, we present several performance measurement experiments and a selection of real-life industrial use cases. We conclude that jQuery provides performance benefits over AngularJS when manipulating large scene graphs in web browsers.

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Braun, Andreas; Krepp, Stefan; Kuijper, Arjan

Acoustic Tracking of Hand Activities on Surfaces

2015

Matthies, Denys J.C. (Ed.) et al.: iWOAR 2015 : 2nd international Workshop on Sensor-based Activity Recognition and Interaction. New York: ACM Press, 2015, 5 p.

International Workshop on Sensor-based Activity Recognition (iWOAR) <2, 2015, Rostock, Germany>

Many common forms of activities are tactile in their nature. We touch, grasp, and interact with a plethora of objects every day. Some of those objects are registering our activities, such as the millions of touch screens we are using every day. Adding perception to arbitrary objects is an active area of research, with a variety of technologies in use. Acoustic sensors, such as microphones, react to mechanical waves propagating through a medium. By attaching an acoustic sensor to a surface, we can analyze activities on this medium. In this paper, we present signal analysis and machine learning methods that enable us to detect a variety of interaction events on a surface. We extend from previous work, by combining swipe and touch detection in a single method, for the latter achieving an accuracy between 91% and 99% with a single microphone and 97% to 100% with two microphones.

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Active Contour based Segmentation of Resected Livers in CT Images

2015

Ourselin, Sébastien (Ed.) et al.: Medical Imaging 2015: Image Processing. Bellingham: SPIE Press, 2015. (Proceedings of SPIE 9413), pp. 941316-1 - 941316-6

SPIE Medical Imaging Symposium <2015, Orlando, FL, USA>

The majority of state of the art segmentation algorithms are able to give proper results in healthy organs but not in pathological ones. However, many clinical applications require an accurate segmentation of pathological organs. The determination of the target boundaries for radiotherapy or liver volumetry calculations are examples of this. Volumetry measurements are of special interest after tumor resection for follow up of liver regrow. The segmentation of resected livers presents additional challenges that were not addressed by state of the art algorithms. This paper presents a snakes based algorithm specially developed for the segmentation of resected livers. The algorithm is enhanced with a novel dynamic smoothing technique that allows the active contour to propagate with different speeds depending on the intensities visible in its neighborhood. The algorithm is evaluated in 6 clinical CT images as well as 18 artificial datasets generated from additional clinical CT images.

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Wilmsdorff, Julian von; Kuijper, Arjan (Betreuer); Große-Puppendahl, Tobias (Betreuer)

Activity Recognition based on Electric Potential Sensing

2015

Darmstadt, TU, Master Thesis, 2015

Electric fields are influenced by the human body and other conducting materials. This property can be used to detect presence of human bodies. For the detection of presence and activity recognition, mostly capacitive measurement techniques are used. Despite the fact that capacitive sensing is an fairly old technology, since it has been around since the 1920's, it is still a hot topic of ongoing research works. Today, capacitive measurement techniques are used in touch-screens, in the automobile industry and many other fields of Ubiquitous Computing. But a drawback of the capacitive technology is the energy consumption, which is an important aspect of mobile devices. That is why, in this thesis, i investigate the potential of electric potential sensing (EPS), a purely passive capacitive measurement technique, which can be implemented with an extremely low power consumption. First, the most commonly used capacitive measurement techniques will be analyzed and how they work. This is done to understand the pros and cons of electric potential sensing compared to other technologies. After analyzing electric potential sensing and related capacitive measurement techniques, we will have a closer look at some possible areas of application of electric potential sensing in an explorative studie. Hence, multiple experiments, involving electric potential sensing in various environmental settings for different use-case scenarios, will be conducted. This is done to evaluate the best use-case for this technology. Then, after selecting the most suitable use-case for activity recognition with EPS, two sensor systems are developed, discussed and evaluated. At the end, the benefits and limitations of EPS will be concluded with regards to capacitive sensing.

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Sakas, Georgios (Betreuer); Jung, Florian (Betreuer)

Adaptive Voxel-based Classifier for Semi-automatic Segmentation of Tumors in the Head and Neck Area Based on T2-Weighted MRI Image Data

2015

Darmstadt, TU, Bachelor Thesis, 2015

Measuring the size and location of a tumor is a major part of cancer staging and thus also crucial to plan treatment and predict the success chances of the same. Both properties can be extracted from a segmentation. We present a new method for semi-automatic segmentation of tumors in the head and neck area using MR images. The new method incorporates known segmentations that were manually created by medical doctors. Other than that the only user interaction needed is setting a seed point. After the seed point and an input image are entered, the algorithm starts by searching for a similar one in the database. The underlying assumption is that the intensities of a tumor in two comparable images also have comparable values. Using histograms for both the database image as well as the manual segmentation of it, the intensities that are likely to be featured in the tumor are calculated. After creating a basic segmentation, the actual tumor is extracted using opening, closing and a connected threshold filter. The algorithm was developed using five datasets of T2-weighted MR images with a leave-one-out cross validation technique. When comparing the generated tumor segmentations with the manual ones, they had a DSC in the range of 0.41 and 0.77, with an average of 0.60. Furthermore the new method was also tested on lymph nodes. Further suggestions for improvements are given.

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aHead: Considering the Head Position in a Multi-sensory Setup of Wearables to Recognize Everyday Activities with Intelligent Sensor Fusions

2015

Kurosu, Masaaki (Ed.): Human-Computer Interaction. Proceedings Part II : Interaction Technologies. Springer International Publishing, 2015. (Lecture Notes in Computer Science (LNCS) 9170), pp. 741-752

International Conference on Human-Computer Interaction (HCII) <17, 2015, Los Angeles, CA, USA>

In this paper we examine the feasibility of Human Activity Recognition (HAR) based on head mounted sensors, both as stand-alone sensors and as part of a wearable multi-sensory network. To prove the feasibility of such setting, an interactive online HAR-system has been implemented to enable for multi-sensory activity recognition while making use of a hierarchical sensor fusion. Our system incorporates 3 sensor positions distributed over the body, which are head (smart glasses), wrist (smartwatch), and hip (smartphone). We are able to reliably distinguish 7 daily activities, which are: resting, being active, walking, running, jumping, cycling and office work. The results of our field study with 14 participants clearly indicate that the head position is applicable for HAR. Moreover, we demonstrate an intelligent multi-sensory fusion concept that increases the recognition performance up to 86.13 % (recall). Furthermore, we found the head to possess very distinctive movement patterns regarding activities of daily living.

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Kirchbuchner, Florian; Große-Puppendahl, Tobias; Hastall, Matthias R.; Distler, Martin; Kuijper, Arjan

Ambient Intelligence from Senior Citizens' Perspectives: Understanding Privacy Concerns, Technology Acceptance, and Expectations

2015

Ruyter, Boris de (Ed.) et al.: Ambient Intelligence : 12th European Conference, AmI 2015. Springer, 2015. (Lecture Notes in Computer Science (LNCS) 9425), pp. 48-59

European Conference on Ambient Intelligence (AmI) <12, 2015, Athens, Greece>

Especially for seniors, Ambient Intelligence can provide assistance in daily living and emergency situations, for example by automatically recognizing critical situations. The use of such systems may involve trade-offs with regard to privacy, social stigmatization, and changes of the well-known living environment. This raises the question of how older adults perceive restrictions of privacy, accept technology, and which requirements are placed on Ambient Intelligent systems. In order to better understand the related concerns and expectations, we surveyed 60 senior citizens. The results show that experience with Ambient Intelligence increases technology acceptance and reduces fears regarding privacy violations and insufficient system reliability. While participants generally tolerate a monitoring of activities in their home, including bathrooms, they do not accept commercial service providers as data recipients. A comparison between four exemplary systems shows that camera-based solutions are perceived with much greater fears than wearable emergency solutions. Burglary detection was rated as similarly important assigned as health features, whereas living comfort features were considered less useful.

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Eisele, Philipp; Tausch, Reimar (Betreuer); Posniak, Oliver (Betreuer)

Analyse und Evaluation effizienter Algorithmen zur Oberflächenrekonstruktion von Punktwolken

2015

Darmstadt, Hochschule, Bachelor Thesis, 2015

Um reale Objekte unserer Welt einem breiteren Publikum zuzuführen, sie zu sichern und zu analysieren sind zahlreiche Vorgehensweisen entstanden, ihre äußere Erscheinung virtuell zu erfassen. Bestehende Verfahren zu Digitalisierung von Körpern registrieren die Oberfläche dieser jedoch nicht unmittelbar: Aus den Daten des vermessenden Apparates wird zunächst eine Menge von Punkten im dreidimensionalen Raum erzeugt, die die Außenhülle des jeweiligen Gegenstandes widerspiegelt. Ein Algorithmus zur Oberflächenrekonstruktion wandelt diese Wolke aus Punkten im Folgeschritt in ein Netz aus Dreiecken um, mithilfe dessen die Gestalt des Originals im Erfolgsfall kontinuierlich und effizient angezeigt werden kann. In dieser Ausarbeitung werden verschiedene Algorithmen vorgestellt, die der Umwandlung einer solchen Punktwolke in eine virtuelle Oberfläche dienen. Da die Punktwolken bei Anwendung moderner Erfassungsapparate sehr viele Elemente enthalten können, werden lediglich solche analysiert, die auch große Mengen von Punkten in annehmbarer Laufzeit verarbeiten können. Weiterhin sind Punktwolken nach der praktischen Vermessung häufig regional undicht oder mit Messfehlern behaftet. Dementsprechend wird zu den verschiedenen Verfahren zur Oberflächenrekonstruktion jeweils dargelegt, inwiefern sie zur originalgetreuen Rekonstruktion von mangelhaft registrierten Arealen fähig sind.

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Merz, Johannes; Getto, Roman; Landesberger, Tatiana von; Fellner, Dieter W.

Analysis of 3D Mesh Correspondences Concerning Foldovers

2015

Skala, Vaclav (Ed.): WSCG 2015. Short Papers Proceedings : 23rd International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision. [cited 16 October 2015] Available from http://wscg.zcu.cz/DL/wscg DL.htm: University of West Bohemia, 2015, pp. 149-158

International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG) <23, 2015, Plzen, Czech Republic>

Foldovers (i.e., folding of triangles in a 3D mesh) are artifacts that cause problems for morphing. Mesh morphing uses vertex correspondences among the source and the target mesh to define the morphing path. Although there exist techniques for making a foldover-free mesh morphing, identification and correction of foldovers in existing correspondences is still an unsolved issue. This paper proposes a new technique for the identification and resolution of foldovers for mesh morphing using predefined 3D mesh correspondences. The technique is evaluated on several different meshes with given correspondences. The mesh examples comprise both real medical data and synthetically deformed meshes. We also present various possible usage scenarios of the new algorithm, showing its benefit for the analysis and comparison of mesh correspondences with respect to foldover problems.

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Alm, Rebekka; Aehnelt, Mario; Hadlak, Steffen; Urban, Bodo

Annotated Domain Ontologies for the Visualization of Heterogeneous Manufacturing Data

2015

Yamamoto, Sakae (Ed.): Human Interface and the Management of Information. Proceedings Part I : Information and Knowledge Design. Springer International Publishing, 2015. (Lecture Notes in Computer Science (LNCS) 9172), pp. 3-14

International Conference on Human Interface and the Management of Information (HIMI) <2015, Los Angeles, CA, USA>

Manufacturing processes such as monitoring and controlling typically confront the user with a variety of heterogeneous data sources and systems. The cognitive efforts to summarize and combine the data from these different sources affect the user's efficiency. Our goal is to support the user in his work task by integrating the data and presenting them in a more perceivable way. Hence, we introduce an approach in which different data sources are integrated in an annotated semantic knowledge base: our domain ontology. Based on this ontology, contextually relevant data for a specific work task is selected and embedded into a meta-visualization providing an overview of the data based on the user's mental model. Two systems finally exemplify the usage of our approach.

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Alm, Rebekka; Waltemath, Dagmar; Wolfien, Markus; Wolkenauer, Olaf; Henkel, Ron

Annotation-Based Feature Extraction from Sets of SBML Models

2015

Journal of Biomedical Semantics, Vol.6 (2015), Article 6:20, 13 p.

Background: Model repositories such as BioModels Database provide computational models of biological systems for the scientific community. These models contain rich semantic annotations that link model entities to concepts in well-established bio-ontologies such as Gene Ontology. Consequently, thematically similar models are likely to share similar annotations. Based on this assumption, we argue that semantic annotations are a suitable tool to characterize sets of models. These characteristics improve model classification, allow to identify additional features for model retrieval tasks, and enable the comparison of sets of models. Results: In this paper we discuss four methods for annotation-based feature extraction from model sets. We tested all methods on sets of models in SBML format which were composed from BioModels Database. To characterize each of these sets, we analyzed and extracted concepts from three frequently used ontologies, namely Gene Ontology, ChEBI and SBO. We find that three out of the methods are suitable to determine characteristic features for arbitrary sets of models: The selected features vary depending on the underlying model set, and they are also specific to the chosen model set. We show that the identified features map on concepts that are higher up in the hierarchy of the ontologies than the concepts used for model annotations. Our analysis also reveals that the information content of concepts in ontologies and their usage for model annotation do not correlate. Conclusions: Annotation-based feature extraction enables the comparison of model sets, as opposed to existing methods for model-to-keyword comparison, or model-to-model comparison.

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Anomaly Detection with Smartwatches as an Opportunity for Implicit Interaction

2015

Association for Computing Machinery (ACM): MobileHCI 2015 : Proceedings of the 17th International Conference on Human-Computer Interaction with Mobile Devices and Services. New York: ACM, 2015, pp. 955-958

International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI) <17, 2015, Copenhagen, Denmark>

In this paper we introduce application scenarios for implicit interaction with Smartwatches for the purpose of user assistance, to create awareness, and to enhance as well as simplify the interaction with Wearables. We envision three scenarios (1) the detection of sleep apnea, (2) the detection of epileptic seizures, and (3) a detection of accidents such as falling, car crashes etc., which are presented and discussed. Therefore, the recognition of all incidents described will be discussed under the meta-topic of anomaly detection.

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Application and Validation of Capacitive Proximity Sensing Systems in Smart Environments: Thesis

2015

Journal of Ambient Intelligence and Smart Environments, Vol.7 (2015), 5, pp. 693-694

The present article summarises the doctoral dissertation of Andreas Braun.

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Arnold, Fabio; Knuth, Martin (Betreuer); Kuijper, Arjan (Betreuer)

Approximation von Reflexionsmodellen für das interaktive Kleidungsdesign unter natürlicher Beleuchtung: Approximation of Reflection Models for Interactive Clothing Design under Natural Illumination

2015

Darmstadt, TU, Bachelor Thesis, 2015

Im Bereich des virtuellen Prototyping ist die Echtzeitsimulation ein unerlässliches Werkzeug geworden. Neben der schnellen und interaktiven Simulation ist die fotorealistische Darstellung der Materialien ein wichtiger Bestandteil, falls das System für Design- und Simulationszwecke eingesetzt werden soll. Das Ziel hierbei ist es, die Produktentwicklungszeit zu verkürzen. Als problematisch hat sich die Darstellung bereits existierender, physikalischer Materialien erwiesen, da diese zunächst aufwändig erfasst werden müssen. Nach der Erfassung müssen die Messdaten oft in ein Format überführt werden, das für eine Darstellung per Echtzeitrendering geeignet ist. Hierbei gehen üblicherweise viele Details verloren, da ein Echtzeitrenderer aus Geschwindigkeitsgründen ein vereinfachtes Modell der Materialien verwendet. Das Ziel dieser Arbeit ist es, für beliebige gemessene BRDF-Daten, die detaillierte Reflektanzeigenschaften vieler physikalischer Materialien enthalten, eine Approximation zu erforschen, die eine Darstellung mit der in "Efficient Self-Shadowing Using Image-Based Lighting on Glossy Surfaces" beschriebenen Beleuchtungsmethode erlaubt. Mit dieser Methode ist es bereits möglich, Oberflächen stetig von diffus über glänzend bis zu vollständig spiegelnd darzustellen. In dieser Bachelorarbeit wird zu Beginn eine geeignete BRDF-Datenbank ausgewählt. Auf der Grundlage verwandter Arbeiten wird eine Approximationsmethode entwickelt, die auf Basis von gemessenen BRDF, geeignete Parameter für die Renderingmethode ermittelt. Parallel wird zum Vergleich eine Groundtruth-Methode entwickelt, welche die BRDF unabhängig von Geschwindigkeit und Speicherverbrauch möglichst genau approximiert. Mit diesen beiden Methoden werden sowohl qualitative als auch quantitative Vergleiche durchgeführt. Die Implementierung wurde in einem eigens für diese Zwecke entwickeltem Framework vorgenommen, welches den Fokus auf schnelles Prototyping legt. Jedoch sollten sich die entwickelten Verfahren leicht auf andere Frameworks übertragen lassen.

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Schulz, Jan; Möller, Klas Ove; Bracher, Astrid; Hieronymi, Martin; Cisewski, Boris; Zielinski, Olver; Voss, Daniela; Gutzeit, Enrico; Dolereit, Tim; Niedzwiedz, Gern; Kohlberg, Gesche; Schories, Dirk; Kiko, Rainer; Körtzinger, Arne; Falldorf, Claas; Fischer, Philipp; Nowald, Nicolas; Beisiegel, Kolja; Martinez-Arbizu, Pedro; Rüssmeier, Nick; Röttgers, Rüdiger; Büdenbender, Jan; Jordt-Sedlazeck, Anne; Koch, Reinhard; Riebesell, Ulf; Hvitfeldt Iversen, Morten; Köser, Kevin; Kwasnitschka, Tom; Wellhausen, Jens; Thoma, Christoph; Barz, Christina; Rohde, Sven; Nattkemper, Tim W.; Schoening, Timm; Peeters, Frank; Hofmann, Hilmar; Busch, Julia A.; Hircher, Hans-Jürgen; Niehoff, Barbara; Hildebrandt, Nicole; Stohr, Erik; Winter, Christian; Herbst, Gabriel; Konrad, Christian; Schmidt, Mark; Linke, Peter; Brey, Thomas; Bange, Hermann W.; Nolle, Lars; Krägefsky, Sören; Gröger, Joachim; Sauter, Eberhard; Schulz, Miriam; Müller, Jens; Rehder, Gregor; Stepputtis, Daniel; Beszteri, Bank; Kloster, Michael; Kauer, Gerhard; Göritz, Anna; Gege, Peter; Lukas, Uwe von; Bathmann, Ulrich

Aquatische Optische Technologien in Deutschland

2015

Meereswissenschaftliche Berichte 97

Optische Technologien und Verfahren sind sowohl in der limnischen als auch marinen Forschung Deutschlands über alle Bereiche und Skalen etabliert und entwickeln sich rasant weiter. Die Arbeitsgruppe ,Aquatische Optische Technologien" (AOT) will Forschern und Anwendern eine Plattform bieten, die Wissenstransfer fördert, der nationalen Entwicklergemeinschaft ein synergistisches Umfeld eröffnet und die internationale Sichtbarkeit der deutschen Aktivitäten in diesem Forschungsfeld erhöht. Diese Zusammenfassung dokumentiert erstmalig die AOT-Verfahren und -Technologien, die von nationalen Forschungsinstitutionen eingesetzt werden. Wir erwarten, dass die Dokumentation einen Trend in Richtung institutsübergreifender Harmonisierung initiiert. Dies wird die Etablierung offener Standards, eine Verbesserung im Zugang zu Dokumentationen und gegenseitige technischer Hilfestellung bei (System-) Integrationen ermöglichen. Effizienz und Leistungsfähigkeit der AOT-Entwicklung und Anwendung auf nationaler Ebene werden von diesen Bestrebungen profitieren. Weitere Arbeitsgruppen und Entwickler werden ausdrücklich ermutigt, Kontakt aufzunehmen, um in einer späteren Auflage berücksichtigt zu werden.

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Covaci, Alexandra; Kramer, Dean; Augusto, Juan Carlos; Rus, Silvia; Braun, Andreas

Assessing Real World Imagery in Virtual Environments for People with Cognitive Disabilities

2015

The Institution of Engineering and Technology (IET): The 11th International Conference on Intelligent Environments : IE 2015. Los Alamitos, Calif.: IEEE Computer Society, 2015, pp. 41-48

International Conference on Intelligent Environments (IE) <11, 2015, Prague, Czech Republic>

People with cognitive disabilities are often socially excluded. We propose a system based on Virtual and Augmented Reality that has the potential to act as an educational and support tool in everyday tasks for people with cognitive disabilities. Our solution consists of two components: the first that enables users to train for several essential quotidian activities and the second that is meant to offer real time guidance feedback for immediate support. In order to illustrate the functionality of our proposed system, we chose to train and support navigation skills. Thus, we conducted a preliminary study on people with Down Syndrome (DS) based on a navigation task. Our experiment was aimed at evaluating the visual and spatial perception of people with DS when interacting with different elements of our system. We provide a preliminary evaluation that illustrates how people with DS perceive different landmarks and types of visual feedback, in static images and videos. Although we focused our study on people with DS, people with different cognitive disabilities could also benefit from the features of our solution. This analysis is mandatory in the design of a virtual intelligent system with several functionalities that aims at helping disabled people in developing basic knowledge in every day tasks.

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Retz, Reimond; Kuijper, Arjan (Betreuer); Nazemi, Kawa (Betreuer)

Assisted Visual Data Exploration for Discovering Information in Digital Libraries

2015

Darmstadt, TU, Master Thesis, 2015

Human access to data plays an increasing role, due to the existing and increasing amount of data. Different disciplines in computer science face this challenge with a variety of approaches, techniques and systems. One promising way is the visual access to the increasing amount of data. Information visualization and visual analytics technologies enable the process of visual exploration. The advantages of visual exploration are that users can discover new and unknown areas and topics in a certain domain. Today's visualization technologies have various limitations that restrict a real access to huge amount of data for searching, analyzing and exploration purposes. The main limitation is the fact that there exists no approach for the entire process of data transformation with data integration, information extraction and visualization for accessing huge amount of data. Most of the systems use either just one dataset, do not use automatic information extraction for enriching data or make no use of interactive visualization methods. A coherent process for integrating data, extracting information and visualizing the information as proposed for visual analytics is missing for real data and heterogeneous data sources. We propose in this thesis such a coherent model for data from different sources. Our model enhances existing approaches by integrating the entire data transformation process for information visualization to support the exploration process. For this, we use ground-truth data from the DBLP digial library as foundation and integrate data from a variety of resources, such as IEEE Xplore or Springer Link. Our main goal is to make use of the surpluses of the different technologies, such as information visualization, visual analytics, data integration and mining, and models of exploratory search to provide a coherent approach that supports the user in the entire exploration and knowledge acquisition process. We propose in this thesis an approach, that makes use of a reference model of interactive information visualization and enhances it with data integration, text and data mining, and assisted search approaches. Further, we implement our model with real world data and enable a proof of feasibility of the entire proposed approach.