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Peer Reviewed
See detailA Visual Editor for Reconfigurable Object Nets based on the ECLIPSE Graphical Editor Framework
Biermann, Enrico; Ermel, Claudia; Hermann, Frank UL et al

in Juhas, G.; Desel, J. (Eds.) Proc. 14th Workshop on Algorithms and Tools for Petri Nets (AWPN'07) (2007)

The main idea behind Reconfigurable Object Nets (RONs) is the integration of transition firing and rule-based net structure transformation of place/transition nets during system simulation. RONs are high ... [more ▼]

The main idea behind Reconfigurable Object Nets (RONs) is the integration of transition firing and rule-based net structure transformation of place/transition nets during system simulation. RONs are high-level nets with two types of tokens: object nets (place/transition nets) and net transformation rules (a dedicated type of graph transformation rules). Firing of high-level transitions may involve firing of object net transitions, transporting object net tokens through the high-level net, and applying net transformation rules to object nets. Net transformations include net modifications such as merging or splitting of object nets, and net refinement. This approach increases the expressiveness of Petri nets and is especially suited to model mobile distributed processes. The paper presents a visual editor for RONs which has been developed in a student project at TU Berlin in summer 2007. The visual editor itself has been realized as a plug-in for ECLIPSE using the ECLIPSE Modeling Framework (EMF) and Graphical Editor Framework (GEF) plug-ins. [less ▲]

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See detailThe Visual in Histories of Education: A Reappraisal
Dussel, Inés; Priem, Karin UL

in Paedagogica Historica (2017), 53(6),

This introduction to the special issue on Images and Films as Objects to Think With presents a historiographical reflection on how images are being approached in the field of educational history. In ... [more ▼]

This introduction to the special issue on Images and Films as Objects to Think With presents a historiographical reflection on how images are being approached in the field of educational history. In recent years, much of the work has been situated at the intersection of visual and material studies; images are considered objects with which humans interact, carrying affects and particular materialities that condition their experience; they are taken as historical artefacts that bring out a plurality of meanings, which continue to grow with each new reading or approach. This introduction presents the articles that are included in this special issue as well as a final commentary written by Lynn Fendler that engages in a dialogue with them. The articles move away from considering the visual as a transparent source with a stable meaning, and open up different possibilities for working with and through it. They also problematise and expand the archives in which historians work; by looking at various surfaces in which images are exhibited and circulate, such as books, reports, art shows, films, magazines, and collective memories, these studies point to the “affective and effective histories” that images tell, and invite new research agendas for a visual history of education. [less ▲]

Detailed reference viewed: 25 (1 UL)
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See detailVisual Literacy
Weth, Constanze UL; Gretsch, Petra

in Gretsch, Petra; Holzäpfel, Lars (Eds.) Lernen mit Visualisierungen. Erkenntnisse aus der Forschung und deren Implikationen für die Fachdidaktik (2016)

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See detailVisual Modeling and Analysis of EMF Model Transformations based on Triple Graph Grammars
Ermel, Claudia; Hermann, Frank UL; Gall, Jürgen et al

in Electronic Communications of the EASST (2012)

The tool HENSHIN is an Eclipse plug-in supporting visual modeling and execution of rule-based EMF model transformations. This paper describes the recent extensions of HENSHIN by a visual editor for triple ... [more ▼]

The tool HENSHIN is an Eclipse plug-in supporting visual modeling and execution of rule-based EMF model transformations. This paper describes the recent extensions of HENSHIN by a visual editor for triple graph grammars (TGGs). The visual editor (called HENSHINTGG) supports a compact visualization of triple rules in an integrated editor panel. Internally, triple graph rules are represented as HENSHIN rules and can be simulated using the HENSHIN EMF model transformation engine. Our extension supports the automatic generation of forward translation rules for transforming source into target models. A converter from HENSHIN TGG rules to the graph transformation analysis tool AGG allows a systematic check for conflicts of forward translation rules in AGG based on critical pair analysis. [less ▲]

Detailed reference viewed: 82 (7 UL)
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See detailVisual Modelling of and on Tangible User Interfaces
Tobias, Eric; Kelsen, Pierre UL

Report (2012)

The purpose of this thesis is to investigate the use and benefit of visual modelling languages (VMLs) in modelling on tangible user interfaces (TUIs), and modelling TUI applications. Three main research ... [more ▼]

The purpose of this thesis is to investigate the use and benefit of visual modelling languages (VMLs) in modelling on tangible user interfaces (TUIs), and modelling TUI applications. Three main research questions are asked: - Is it possible and practical to model an application or process using a TUI? - Which General-purpose VML (GPVML) performs best in modelling a VML scenario for use on TUI? - Is it realistic to use a GPVML to model complex TUI applications? To answer the first research question, a Business Process Model and Notation, version 2 (BPMN2), ideation scenario is used with a tangible widget toolkit prototype on a TUI table to evaluate the performance and obtain feedback from test candidates. The study showed that it is possible to model a process using a TUI and the test candidate feedback did not lead to the conclusion that the modelling was cumbersome or impractical. To find a suitable GPVML, the thesis explores and evaluates the current state of the art in VMLs for describing general problems. After gathering different VMLs, the thesis compares three languages using a simple scenario: the visual object constraint language (VOCL), augmented constraint diagrams (ACD), and the visual contract language (VCL). A weighted evaluation based on multiple quality criteria led to the conclusion that VCL is best suited to model TUI applications, answering the second research question. The thesis answers the third research question by using VCL to model a more complex and complete scenario of an ideation process, which is based on using a BPMN2 on a TUI. This is done to assess VCL's suitability to more complex problems and its maturity. The study concludes that VCL is not yet mature enough to enable its general applicability in a wide variety of settings. The three research questions were dressed with a hypothesis in mind: collaborative, novice friendly modelling environments are able to reduce the gap between stakeholders and software engineers during software projects, leading to a reduction of unrealistic expectations and an increase in the availability of domain knowledge. While the hypothesis is too broad to be proven by this thesis, the research questions answered here give some insights into how to approach it. [less ▲]

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See detailVisual Notation Design 2.0: Towards User-Comprehensible RE Notations
Caire, Patrice UL; Genon, Nicolas; Heymans, patrick et al

in Proceedings of the 21st IEEE International Requirements Engineering Conference (2013)

The success of requirements engineering depends critically on effective communication between business analysts and end users, yet empirical studies show that business stakeholders understand RE notations ... [more ▼]

The success of requirements engineering depends critically on effective communication between business analysts and end users, yet empirical studies show that business stakeholders understand RE notations very poorly. This paper proposes a novel approach to designing RE visual notations that actively involves naïve users in the process. We use i*, one of the most influential RE notations, to demonstrate the approach, but the same approach could be applied to any RE notation. We present the results of 5 related empirical studies that show that novices consistently outperform experts in designing symbols that are comprehensible to novices: the differences are both statistically significant and practically meaningful. Symbols designed by novices increased semantic transparency (their ability to be spontaneously interpreted by other novices) by almost 300% compared to the existing i* notation. The results challenge the conventional wisdom about visual notation design: that it should be conducted by a small group of experts; our research suggests that instead it should be conducted by large numbers of novices. This approach is consistent with principles of Web 2.0, in that it harnesses the collective intelligence of end users and actively involves them in the notation design process as “prosumers” rather than as passive consumers. We believe this approach has the potential to radically change the way visual notations are designed in the future. [less ▲]

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See detailVisual odometry based absolute target geo-location from micro aerial vehicle
Annaiyan, Arun UL; Yadav, Mahadeeswara; Olivares Mendez, Miguel Angel UL et al

in International Conference on Robotics, Automation, Control and Embedded Systems (RACE), 2015 (2015, February 20)

An unmanned aerial system capable of finding world coordinates of a ground target is proposed here. The main focus here was to provide effective methodology to estimate ground target world coordinates ... [more ▼]

An unmanned aerial system capable of finding world coordinates of a ground target is proposed here. The main focus here was to provide effective methodology to estimate ground target world coordinates using aerial images captured by the custom made micro aerial vehicle (MAV) as a part of visual odometery process on real time. The method proposed here for finding target's ground coordinates uses a monocular camera which is placed in MAV belly in forward looking/ Downward looking mode. The Binary Robust Invariant Scalable Key points (BRISK) algorithm was implemented for detecting feature points in the consecutive images. After robust feature point detection, efficiently performing Image Registration between the aerial images captured by MAV and with the Geo referenced images is the prime and core computing operation considered. Precise Image alignment is implemented by accurately estimating Homography matrix. In order to accurately estimate Homography matrix which consists of 9 parameters, this algorithm solves the problem in a Least Square Optimization way. Therefore, this framework can be integrated with visual odometery pipeline; this gives the advantage of reducing the computational burden on the hardware. The system can still perform the task of target geo-localization efficiently based on visual features and geo referenced reference images of the scene which makes this solution to be found as cost effective, easily implementable with robustness in the output. The hardware implementation of MAV along with this dedicated system which can do the proposed work to find the target coordinates is completed. The main application of this work is in search and rescue operations in real time scenario. The methodology was analyzed and executed in MATLAB before implementing real time on the developed platform. Finally, three case studies with different advantages derived from the proposed framework are represented. [less ▲]

Detailed reference viewed: 95 (17 UL)
Peer Reviewed
See detailVisual orientation discrimination: Effect of training on brain activity, a pet study
Schiltz, Christine UL; Dubois, S; Bodart, J.-M et al

Poster (1995, November)

Detailed reference viewed: 17 (1 UL)
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See detailVisual Public Protection Disaster Relief and Critical Infrastructure
Machalek, Aurel UL; Dunlop, Dominic UL; Simon, Carlo et al

Scientific Conference (2016)

Modern society is increasingly dependent on critical infrastructure and on the services that it provides. The loss of one of these services may hit the public immediately in manners which are not always ... [more ▼]

Modern society is increasingly dependent on critical infrastructure and on the services that it provides. The loss of one of these services may hit the public immediately in manners which are not always predictable. Furthermore, the amount of time that a given service is unavailable will affect other services through numerous direct and indirect dependencies, which are seldom considered. Natural or man-made disasters, and combinations of both, will have effects that are difficult or impossible to foresee without the appropriate tools. Due to the rapid progress in electronic communications and information technology, one would expect today’s crisis managers to have access to situational awareness and to the tools needed to inform their decisions. While much has been achieved for single-service operational headquarters like those of police, firefighting and ambulance services, there are no solutions that address the interactions and interdependencies of all critical functions and all critical infrastructure in a Public Protection and Disaster Response context. If a crisis develops when some aspect of critical infrastructure is partly or completely unavailable, crisis managers must make decisions using a very different framework compared to that used to handle limited incidents in normal times. Considering the difficulties resulting from the dependencies and interdependencies of critical infrastructure in normal times, making good decisions is becoming more and more difficult for crisis managers during a crisis. These challenges, combined with the enormous and possibly tragic consequences of suboptimal crisis management, provide good reasons to explore the subject. [less ▲]

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See detailVisual Servoing for UAVs
Campoy, Pascual; Mondragon, Ivan F.; Olivares Mendez, Miguel Angel UL et al

in Fung, Rong-Fong (Ed.) Visual Servoing (2010)

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See detailVisual servoing using fuzzy controllers on an unmanned aerial vehicle
Olivares Mendez, Miguel Angel UL; Campoy, Pascual; Mondragon, Ivan F. et al

in EUROFUSE 2009. workshop on on preference modelling and decision analysis (2009, September)

This paper presents an implementa- tion of three Fuzzy Logic controllers working in parallel onboard a UAV, two for a pan-tilt camera platform and the third for control the yaw of the helicopter. This ... [more ▼]

This paper presents an implementa- tion of three Fuzzy Logic controllers working in parallel onboard a UAV, two for a pan-tilt camera platform and the third for control the yaw of the helicopter. This implementation uses a Lucas-Kanade tracker algo- rithm with a pyramidal optical ow implementation, which gives infor- mation to follow statics and moving objects, besides the UAV vibrations and movements. The platform con- troller is helped by the heading con- troller, in order to make smooth the big movements to the platform, re- ducing the risk of lost the warp selec- tion of the object to track. Also, the heading control remove the physic limit of the platform at the yaw axis. Some laboratory and UAV tests are presented in order to show the differ- ent behaviors and the good response of the presented controllers. [less ▲]

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See detailVisual Spatial Math Training Tool: An iPad Application for Training Visual-Spatial Abilities in Preschoolers
Pazouki, Tahereh UL; Cornu, Véronique UL; Martin, Romain UL

Scientific Conference (2016, June 29)

In this paper, we present a full-fledged educational iOS application called VisualSpatial Math Training (VSMT), which has been developed to improve cognitive abilities in preschoolers. VSMT is a tablet ... [more ▼]

In this paper, we present a full-fledged educational iOS application called VisualSpatial Math Training (VSMT), which has been developed to improve cognitive abilities in preschoolers. VSMT is a tablet-based application that has been designed for the iPad and implemented in the Swift programming language, using the native SpriteKit framework. VSMT provides the means for working with a wide range of geometry puzzles (games) in addition to offering a solution verification engine that can verify user solutions. The main purpose of this application is to strengthen the visual-spatial abilities in young children in order to provide them and their instructors with a better foundation for understanding and teaching mathematics, respectively. Finally, we describe a series of experiments carried out using the VSMT application during special training and assessment sessions in several kindergartens in Luxembourg with over 60 pupils. [less ▲]

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See detailVisual, Literary and Numerical Perspectives on Education: Materiality, Presence and Interpretation
Priem, Karin UL

in Smeyers, Paul; Depaepe, Marc (Eds.) Educational Research: Material Culture and Its Representation (2014)

Detailed reference viewed: 87 (17 UL)
See detailVISUALISATION AND BINNING OF METAGENOMIC DATA
Laczny, Cedric Christian UL

Doctoral thesis (2015)

Metagenomic sequencing and assembly have become important approaches for the in situ characterisation of mixed microbial communities. Nevertheless, the data are typically fragmented and disconnected. The ... [more ▼]

Metagenomic sequencing and assembly have become important approaches for the in situ characterisation of mixed microbial communities. Nevertheless, the data are typically fragmented and disconnected. The binning of individual sequence fragments into population-level genomic complements promotes the population-resolved synchronous study of community composition and functional potential. However, current binning approaches require a priori knowledge, scale poorly to larger datasets, or exclude human input. In this work, a reference-independent approach for the visualisation and subsequent human-augmented binning of metagenomic sequence fragments, represented by their high-dimensional, oligonucleotide frequency-based signatures, is introduced. Due to the efficient and faithful representation of high-dimensional cluster structures in low-dimensional space, the described methodology facilitates the exploration and analysis of large datasets by a human user. Subsequently, a stand-alone software implementation, VizBin, is developed and described. This graphical user interface-based tool is designed to allow a user-friendly application of the herein introduced approach without the requirement of a bioinformatical background, special training, or exceptional computing resources. Following the software development, VizBin was applied for the analysis of human gastrointestinal tract-derived metagenomic sequencing data. This allowed the recovery of six virtually complete or partial genomes of hitherto uncharacterised and deeply branching microbial populations from four taxa including a potential butyrate-producing taxon. In summary, this work illustrates how improved recovery of population-level microbial genomes is achieved by reference-independent binning of assembled metagenomic sequencing data using human input. The broad applicability and robustness of the herein introduced approach is furthermore demonstrated by using VizBin for the visualisation of state-of-the-art long read-sequencing data. Despite the increased sequence error rate of this emerging type of sequencing data, pertinent cluster structures are revealed thus motivating the development of future read-level binning approaches. Targeted wet-lab validation of in silico recovered population-level genomes and comprehensive population-resolved analysis of microbial consortia in situ are key to advancing our knowledge and understanding of microbiota in different environments. [less ▲]

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See detailVisualisierte Wissenschaft.
Lenz, Thomas UL; Zillien, Nicole

in Mitterbauer, Helga; Tragatschnig, Ulrich (Eds.) Kulturwissenschaftliches Jahrbuch Moderne, 2 (2007)

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See detailVisualization and Classification of Protein Secondary Structures using Self-Organizing Maps
Grevisse, Christian UL; Muller, Ian William UL; Jimenez Laredo, Juan Luis UL et al

in IEEE Symposium Series on Computational Intelligence (IEEE SSCI 2014) (2014, December)

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See detailA Visualization Approach for Adaptive Consent in the European Data Protection Framework
Rossi, Arianna UL; Palmirani, Monica

in Edelmann, Noella; Parycek, Peter (Eds.) Proceedings of the 7th International Conference for E-Democracy and Open Government (2017)

For the first time in the history of European data protection law, the use of visualizations and especially of icons is explicitly suggested as a way to improve the comprehensibility of the information ... [more ▼]

For the first time in the history of European data protection law, the use of visualizations and especially of icons is explicitly suggested as a way to improve the comprehensibility of the information about data handling practices provided to the data subjects, which plays a crucial role to obtain informed consent. Privacy icon sets have already been developed, but they differ in the kinds of information they depict and in the perspectives they embed. Moreover, they have not met widespread adoption, one reasons being that research has shown that possibility of misinterpretation of these symbols exist. Our research relies on legal Semantic Web technologies and on principles drawn from legal design and Human Computer Interaction to propose visualizations of privacy policies and consent forms. The final aim is to enhance the communication of data practices to users and to support their decision about whether to give or withhold consent [less ▲]

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See detailVisualization of individual DNA loops and a map of loop domains in the human dystrophin gene
Iarovaia, Olga V.; Bystritskiy, Andrey; Ravcheev, Dmitry UL et al

in Nucleic Acids Research (2004), 32(7), 2079-2086

The organization of the human dystrophin gene into loop domains has been studied using two different experimental approaches: excision of DNA loops mediated by nuclear matrix-bound topoisomerase II and in ... [more ▼]

The organization of the human dystrophin gene into loop domains has been studied using two different experimental approaches: excision of DNA loops mediated by nuclear matrix-bound topoisomerase II and in situ hybridization of different probes with histone- depleted nuclei (nuclear halos). Our objective was to examine if the DNA loops mapped by this biochemical approach coincide with loops visualized by microscopy. The results obtained using both approaches were in good agreement. Eight loops separated by attachment regions of different length were mapped in the upstream part (up to exon 54) of the gene by topoisomerase II-mediated excision. One of these loops was then directly visualized by in situ hybridization of the corresponding bacmid clone with nuclear halos. This is the ®rst direct demonstration that a DNA domain mapped as a loop using a biochemical approach corresponds to a loop visible on cytological preparations. The validity of this result and of the whole map of loop domains was con®rmed by in situ hybridization using probes derived from other attachment regions or loops mapped by topoisomerase II-mediated cleavage; these probes hybridized on the core or halo region, respectively, of nuclear halos. Our results demonstrate that a single transcription unit may be organized into several loops and that DNA loop attachment regions may be fairly long. Three out of four replication origins mapped in this gene co-localize with loop attachment regions, and the major deletion hot spot is harbored in an attachment region. These results strongly suggest that partitioning of genomic DNA into speci®c loops attached to a skeletal structure is a characteristic feature of eukaryotic chromosome organization in interphase. [less ▲]

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See detailVisualization of omics data for systems biology
Gehlenborg, Nils; O'Donoghue, Sean I.; Baliga, Nitin S. et al

in Nature Methods (2010), 7(3), 56-68

High-throughput studies of biological systems are rapidly accumulating a wealth of 'omics'-scale data. Visualization is a key aspect of both the analysis and understanding of these data, and users now ... [more ▼]

High-throughput studies of biological systems are rapidly accumulating a wealth of 'omics'-scale data. Visualization is a key aspect of both the analysis and understanding of these data, and users now have many visualization methods and tools to choose from. The challenge is to create clear, meaningful and integrated visualizations that give biological insight, without being overwhelmed by the intrinsic complexity of the data. In this review, we discuss how visualization tools are being used to help interpret protein interaction, gene expression and metabolic profile data, and we highlight emerging new directions. [less ▲]

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See detailVisualization of the medial forebrain bundle using diffusion tensor imaging.
Hana, Ardian; Hana, Anisa; Dooms, Georges et al

in Frontiers in Neuroanatomy (2015), 9

Diffusion tensor imaging is a technique that enables physicians the portrayal of white matter tracts in vivo. We used this technique in order to depict the medial forebrain bundle (MFB) in 15 consecutive ... [more ▼]

Diffusion tensor imaging is a technique that enables physicians the portrayal of white matter tracts in vivo. We used this technique in order to depict the medial forebrain bundle (MFB) in 15 consecutive patients between 2012 and 2015. Men and women of all ages were included. There were six women and nine men. The mean age was 58.6 years (39-77). Nine patients were candidates for an eventual deep brain stimulation. Eight of them suffered from Parkinson's disease and one had multiple sclerosis. The remaining six patients suffered from different lesions which were situated in the frontal lobe. These were 2 metastasis, 2 meningiomas, 1 cerebral bleeding, and 1 glioblastoma. We used a 3DT1-sequence for the navigation. Furthermore T2- and DTI- sequences were performed. The FOV was 200 x 200 mm(2), slice thickness 2 mm, and an acquisition matrix of 96 x 96 yielding nearly isotropic voxels of 2 x 2 x 2 mm. 3-Tesla-MRI was carried out strictly axial using 32 gradient directions and one b0-image. We used Echo-Planar-Imaging (EPI) and ASSET parallel imaging with an acceleration factor of 2. b-value was 800 s/mm(2). The maximal angle was 50 degrees . Additional scanning time was < 9 min. We were able to visualize the MFB in 12 of our patients bilaterally and in the remaining three patients we depicted the MFB on one side. It was the contralateral side of the lesion. These were 2 meningiomas and one metastasis. Portrayal of the MFB is possible for everyday routine for neurosurgical interventions. As part of the reward circuitry it might be of substantial importance for neurosurgeons during deep brain stimulation in patients with psychiatric disorders. Surgery in this part of the brain should always take the preservation of this white matter tract into account. [less ▲]

Detailed reference viewed: 34 (3 UL)