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343 results on '"Kray, Christian"'

1. Geofreebie: A Location-Based Freecycling App to Support Forced Migrant Resettlement

Author

Braun, Lucas, Degbelo, Auriol, and Kray, Christian

Subjects
Computer Science - Human-Computer Interaction, H.5.2, H.1.2
Abstract

Germany has witnessed an influx of forced migrants in recent years. Promoting social interaction with the local community is key to supporting the resettlement of these newcomers. Location-based freecycling services present important benefits due to freecycling's potential to bolster social engagement and location-based services' ability to adapt to the user's context. Yet, their potential to support forced migrants' resettlement is yet to be examined. We conducted needs assessment interviews with 11 participants in Muenster, Germany. We analyzed the interview results to develop user requirements for location-based freecycling services. We then implemented a subset of the user requirements as a prototype mobile app called Geofreebie. The evaluation of the app with 22 participants showed that Geofreebie offered two key advantages for forced migrants' resettlement: it increased the size of their social network, and created a sense of community on their side. These findings can benefit researchers and developers of location-based services to support forced migrant resettlement., Comment: Article accepted for publication in the Journal of Location-based Services

Published
2021
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2. Map plasticity

Author

Kray, Christian and Degbelo, Auriol

Subjects
Computer Science - Human-Computer Interaction
Abstract

With the arrival of digital maps, the ubiquity of maps has increased sharply and new map functionalities have become available such as changing the scale on the fly or displaying/hiding layers. Users can now interact with maps on multiple devices (e.g. smartphones, desktop computers, large-scale displays, head-mounted displays) using different means of interaction such as touch, voice or gestures. However, ensuring map functionalities and good user experience across these devices and modalities frequently entails dedicated development efforts for each combination. In this paper, we argue that introducing an abstract representation of what a map contains and affords can unlock new opportunities. For this purpose, we propose the concept of map plasticity, the capability of a map-based system to support different contexts of use while preserving usability and functionality. Based on this definition, we discuss core components and an example. We also propose a research agenda for realising map plasticity and its benefits., Comment: Poster Presentation at the 14th International Conference on Spatial Information Theory: COSIT'19. Regensburg, Germany

Published
2019

3. A systematic approach for assessing the importance of visual differences in reproduced maps.

Author

Koukouraki, Eftychia and Kray, Christian

Abstract

Critical to the foundation of scientific research, the reproducibility of studies and their results is a fundamental element, ensuring the credibility of the findings and fostering trust. Maps play an important role here, as they are used across disciplines to visualize complex insights and outcomes from a wide range of studies. Due to their relevance in this context, it is essential to be able to reproduce maps as well, and consequently, to assess whether a map reproduction was successful. In this paper, we present our research on which aspects affect the success of map reproduction and how to assess map reproduction based on the visual differences between the original and the reproduced map. We collected data from two focus groups and an online survey to gain a deeper understanding of how geoscientists and map experts conceptualize map reproduction, which factors they consider relevant in this process, and how strong their impact is relative to each other. We analyzed this data qualitatively and quantitatively to create a conceptual model that describes the assessment of map reproduction and a set of criteria that influence the success of the reproduction. With these contributions, we aim to provide an initial toolkit for systematically assessing the success of map reproduction attempts. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Natural Interaction with Video Environments Using Gestures and a Mirror Image Avatar

Author

Kray, Christian, Wilhelm, Dennis, Fechner, Thore, Ostkmap, Morin, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Abascal, Julio, editor, Barbosa, Simone, editor, Fetter, Mirko, editor, Gross, Tom, editor, Palanque, Philippe, editor, and Winckler, Marco, editor

Published
2015
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19. Using an Immersive Video Environment to Assess Pedestrians’ Compliance With COVID Distance Keeping Interventions

Author

Stenkamp, Jan, Karic, Benjamin, Scharf, Paula, Verstegen, Judith A, Kray, Christian, Stenkamp, Jan, Karic, Benjamin, Scharf, Paula, Verstegen, Judith A, and Kray, Christian

Abstract

Physical distancing is a key measure to slow the spread of many highly infectious diseases, e.g. COVID-19. Streetscape interventions such as pedestrian signage can contribute to ensuring distances are kept, but it is unclear to what extent people comply with these in practice. This paper tackles this question using an immersive video environment to realistically simulate real-life streetscapes in the lab. In a controlled user study, we augmented panoramic video footage with pedestrian one-way street signage and recorded route decisions to assess compliance with distance keeping measures. Our results indicate that such signage affects routing decisions and can thus help pedestrians to avoid crowded situations where distance keeping is difficult. We also identified further factors affecting decisions and a correlation between intention to comply and actual compliance. The experimental method we used enabled us to effectively and safely carry out a study of a phenomenon that in the real world depends on interaction with the physical environment. This method may have applications in other areas in which simulations of physical environments are important.

Published
2023

20. Map Reproducibility in Geoscientific Publications: An Exploratory Study

Author

Eftychia Koukouraki and Christian Kray, Koukouraki, Eftychia, Kray, Christian, Eftychia Koukouraki and Christian Kray, Koukouraki, Eftychia, and Kray, Christian

Abstract

Reproducibility is a core element of the scientific method. In the Geosciences, the insights derived from geodata are frequently communicated through maps, and the computational methods to create these maps vary in their ease of reproduction. In this paper, we present the results from a study where we tried to reproduce the maps included in geoscientific publications. Following a systematic approach, we collected 27 candidate papers and in four cases, we were able to successfully reproduce the maps they contained. We report on the approach we applied, the issues we encountered and the insights we gained while attempting to reproduce the maps. In addition, we provide an initial set of criteria to assess the success of a map reproduction attempt. We also propose some guidelines for improving map reproducibility in geoscientific publications. Our work sheds a light on the current state of map reproducibility in geoscientific papers and can benefit researchers interested in publishing maps in a more reproducible way.

Published
2023
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22. COSIT 2017 Short Papers—Introduction

Author

Kray, Christian, Yuan, May, Cartwright, William, Series editor, Gartner, Georg, Series editor, Meng, Liqiu, Series editor, Peterson, Michael P., Series editor, Fogliaroni, Paolo, editor, Ballatore, Andrea, editor, and Clementini, Eliseo, editor

Published
2018
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25. Transitional Spaces: Between Indoor and Outdoor Spaces

Author

Kray, Christian, Fritze, Holger, Fechner, Thore, Schwering, Angela, Li, Rui, Anacta, Vanessa Joy, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Tenbrink, Thora, editor, Stell, John, editor, Galton, Antony, editor, and Wood, Zena, editor

Published
2013
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26. Scalable Navigation Support for Crowds: Personalized Guidance via Augmented Signage

Author

Hamhoum, Fathi, Kray, Christian, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Egenhofer, Max, editor, Giudice, Nicholas, editor, Moratz, Reinhard, editor, and Worboys, Michael, editor

Published
2011
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28. Evaluating Ubiquitous Systems with Users (Workshop Summary)

Author

Kray, Christian, Larsen, Lars Bo, Olivier, Patrick, Biemans, Margit, van Bunningen, Arthur, Fetter, Mirko, Jay, Tim, Khan, Vassilis-Javed, Leitner, Gerhard, Mulder, Ingrid, Müller, Jörg, Plötz, Thomas, Lopez de Vallejo, Irene, Mühlhäuser, Max, editor, Ferscha, Alois, editor, and Aitenbichler, Erwin, editor

Published
2008
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29. Factoring User Experience into the Design of Ambient and Mobile Systems

Author

Harrison, Michael D., Kray, Christian, Sun, Zhiyu, Zhang, Huqiu, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Gulliksen, Jan, editor, Harning, Morton Borup, editor, Palanque, Philippe, editor, van der Veer, Gerrit C., editor, and Wesson, Janet, editor

Published
2008
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33. Using Cooperative Artefacts as Basis for Activity Recognition

Author

Strohbach, Martin, Kortuem, Gerd, Gellersen, Hans-Werner, Kray, Christian, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Markopoulos, Panos, editor, Eggen, Berry, editor, Aarts, Emile, editor, and Crowley, James L., editor

Published
2004
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34. Cooperative Artefacts: Assessing Real World Situations with Embedded Technology

Author

Strohbach, Martin, Gellersen, Hans-Werner, Kortuem, Gerd, Kray, Christian, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Davies, Nigel, editor, Mynatt, Elizabeth D., editor, and Siio, Itiro, editor

Published
2004
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35. Interactive Positioning Based on Object Visibility

Author

Kray, Christian, Kortuem, Gerd, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Brewster, Stephen, editor, and Dunlop, Mark, editor

Published
2004
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37. Two Path Preposition: Along and Past

Author

Kray, Christian, Baus, Jörg, Zimmer, Hubert, Speiser, Harry, Krüger, Antonio, Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, and Montello, Daniel R., editor

Published
2001
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47. SupplementaryMaterial_Geofreebie

Author

Braun, Lucas, Degbelo, Auriol, and Kray, Christian

Abstract

Supplementary material of the article "Geofreebie: A Location-Based Freecycling App to Support Forced Migrant Resettlement"

Published
2021
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49. Opening Reproducible Research II:Research proposal for public record submitted to DFG programme Infrastructure for Electronic Publications and Digital Scholarly Communication

Author

Pebesma, Edzer J., Kray, Christian, Tröger, Beate, Nüst, D. (Daniel), Konkol, M. (Markus), Lorenz, J. (Jörg), Przibytzin, H. (Holger), Schutzeichel, M. (Marc), and Universitäts- und Landesbibliothek Münster

Subjects
020 Library and information sciences, Computer science, information, general works, 000 Computer science, information, general works, ddc:020, Natural sciences and mathematics, proposal, open science, reproducibility, open reproducible research, ORR, reproducible research, O2R2, ddc:000, 500 Natural sciences and mathematics, ddc:500, Library and information sciences, Antrag, Offene Wissenschaft, Reproduzierbarkeit, Offene Reproduzierbare Forschung, reproduzierbare Forschung
Abstract

The main goal of the Opening Reproducible Research (ORR) project was the design, implementation, and evaluation of the Executable Research Compendium (ERC). The ERC encapsulates a scientific paper with the used data and software to enable third parties to reproduce the original research results. This follow-up project proposal, O2R2 contributes to changing the way scientific results are communicated and disseminated by realising a broad-based deployment of ORR’s concepts and solutions. O2R2 will transform technology of scientific publishing by enhancing publications in special journal issues with publishers and by enhancing open source publication platforms with ERC-based capabilities. In O2R2, we address issues of reproducibility by lowering barriers for the creation of ERCs, create tangible incentives for researchers to publish ERCs, and collect long-term operational data as key figures for providers of scholarly communication platforms., Das Hauptziel des Projekts Opening Reproducible Research (ORR) war die Konzeption, Umsetzung und Evaluierung des Executable Research Compendium (ERC). Das ERC kapselt eine wissenschaftliche Arbeit mit den verwendeten Daten und Software, um Dritten die Reproduktion der ursprünglichen Forschungsergebnisse zu ermöglichen. Dieser Folgeprojektantrag, O2R2, beschreibt nächste Schritte die Art und Weise zu verändern, wie wissenschaftliche Ergebnisse kommuniziert und verbreitet werden. In diesem Projekt wird eine breit angelegte Anwendung der Konzepte und Lösungen von ORR realisiert. O2R2 wird die Technologie des wissenschaftlichen Publizierens verändern, indem es die Veröffentlichungen in speziellen Zeitschriftenausgaben mit Verlegern verbessert und Open-Source-Publikationsplattformen mit ERC-basierten Interaktionsmöglichkeiten erweitert. In O2R2 addressieren wir Fragen der Reproduzierbarkeit, indem wir die Hürden für die Einrichtung von ERCs senken, konkrete Anreize für Forscher zur Veröffentlichung von ERCs schaffen und langfristige Betriebsdaten als Schlüsselzahlen für Anbieter von wissenschaftlichen Kommunikationsplattformen sammeln., 1 State of the Art and Preliminary Work ..... 1 2 Objectives and Work Programme ..... 6 3 Bibliography ..... 14

Published
2020

50. Enhancing Usability Evaluation of Web-Based Geographic Information Systems (WebGIS) with Visual Analytics

Author

Unrau, René and Kray, Christian

Subjects
Human-centered computing → User studies, usability evaluation, visual analytics, Human-centered computing → Usability testing, map interaction
Abstract

Many websites nowadays incorporate geospatial data that users interact with, for example, to filter search results or compare alternatives. These web-based geographic information systems (WebGIS) pose new challenges for usability evaluations as both the interaction with classic interface elements and with map-based visualizations have to be analyzed to understand user behavior. This paper proposes a new scalable approach that applies visual analytics to logged interaction data with WebGIS, which facilitates the interactive exploration and analysis of user behavior. In order to evaluate our approach, we implemented it as a toolkit that can be easily integrated into existing WebGIS. We then deployed the toolkit in a user study (N=60) with a realistic WebGIS and analyzed users' interaction in a second study with usability experts (N=7). Our results indicate that the proposed approach is practically feasible, easy to integrate into existing systems, and facilitates insights into the usability of WebGIS.

Published
2020
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