H. Ulrich Hoppe's research while affiliated with University of Duisburg-Essen and other places

Publications (279)

Conference Paper
“See the Image in Different Contexts”: Using Reverse Image Search to Support the Identification of Fake News in Instagram-Like Social Media
Conference Paper
Full-text available
Social media are an integral part of the daily lives of today’s young generation. In addition to the positive impact on learning through these channels, there are also risks related to toxic content like “fake news” on various social media. Fake news aims to change opinions based on disinformation or misinformation supporting conspiracy theories, e...
Article
Full-text available
Access-Control Lists (ACLs) (a.k.a. “friend lists”) are one of the most important privacy features of Online Social Networks (OSNs) as they allow users to restrict the audience of their publications. Nevertheless, creating and maintaining custom ACLs can introduce a high cognitive burden on average OSNs users since it normally requires assessing th...
Chapter
Full-text available
Today’s young generation uses a variety of social media as part of their everyday life. This can be seen as an enrichment, but it is also the source of various threats: Filter bubbles and echo chambers are general phenomena that counter-balance free communication and exchange and can lead to toxic radicalization confirmation bias and polarization....
Article
Full-text available
Human-Robot Collaboration (HRC) has the potential for a paradigm shift in industrial production by complementing the strengths of industrial robots with human staff. However, exploring these scenarios in physical experimental settings is costly and difficult, e.g., due to safety considerations. We present a virtual reality application that allows t...
Article
Although much has been published regarding street protests on social media, few works have attempted to characterize social media users’ spatial behavior in such events. The research reported here uses spatial capture-recapture methods to determine the influence of the built environment, physical proximity to protest location, and collective postin...
Chapter
Citizen Science (CS) projects provide a space for collaboration among scientists and the general public as a basis for making joint scientific discoveries. Analysis of existing datasets from CS projects can broaden our understanding of how different stakeholder groups interact and contribute to the joint achievements. To this end, we have collected...
Article
Full-text available
Under the notion of “CSCL scripts”, different pedagogical models for structuring and supporting collaboration in the classroom have been proposed. We report on a practical experience with scripts based on the Pyramid collaborative learning flow pattern supported by a specific classroom tool and a teacher-facing dashboard that implements mirroring a...
Preprint
Access-Control Lists (ACLs) (a.k.a. friend lists) are one of the most important privacy features of Online Social Networks (OSNs) as they allow users to restrict the audience of their publications. Nevertheless, creating and maintaining custom ACLs can introduce a high cognitive burden on average OSNs users since it normally requires assessing the...
Preprint
Full-text available
Although much has been published regarding street protests on social media, few works have attempted to characterize social media users' spatial behavior in such events. The research reported here uses spatial capture-recapture methods to determine the influence of the built environment, physical proximity to protest location, and collective postin...
Article
Full-text available
Collaborative learning in small groups can enrich and enhance the learning experience in large online courses by facilitating interaction and collaborative knowledge building between peers. on the work reported here addresses scenarios based on asynchronous communication and exchange. As compared to synchronous and face-to-face settings, these scen...
Chapter
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The digital transformation of industry environments creates new demands but also opportunities for vocational education and training (VET). On the one hand, the introduction of new digital learning tools involves the risk of creating a digital parallel world. On the other hand, such tools have the potential to provide intelligent and contextualized...
Chapter
Adaptive robots that collaborate with humans in shared task environments are expected to enhance production efficiency and flexibility in a near future. In this context, the question of acceptance of such a collaboration by human workers is essential for a successful implementation. Augmenting the robot-to-human communication channel with situation...
Article
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Virtual role-playing games can provide an authentic experience of situated learning and allow for trying out different problem-solving and communication strategies without consequences in the real world. This is of particular interest and benefit for the training of social skills. This article presents a conceptual and technical framework for serio...
Chapter
The presented system and approach facilitate intelligent, contextualized information access for learners based on automatic learning video analysis. The underlying workflow starts with automatically extracting keywords from learning videos followed by the generation of recommendations of learning materials. The approach has been implemented and inv...
Article
When domain experts try to find a business solution, ambiguous terms arise within the context of discussion in a multidisciplinary research group. Different meanings and relationships with various concepts cause ambiguous semantics. This research aims to address complex business problems in a collaborative research group. This approach presents a c...
Chapter
Full-text available
Network-Text Analysis (NTA) is a technique for extracting networks of concepts appearing in natural language texts that are linked by a certain measure of proximity. In prior works it has been argued that those networks are a representation of the mental model of the author. Extracting those networks often requires a high amount of domain knowledge...
Conference Paper
Full-text available
Digitization in vocational education and training (VET) offers new opportunities for integrating work processes and background knowledge through interactive media. This involves the design, testing and evaluation of innovative means of didactic and technical support. In the project "Digitized support for competence development in the workplace", th...
Article
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Following publication of the original article [1], the author reported that figure 5 numbered correction was not implemented during the production process. The corrected figure can be found below.
Chapter
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In consideration of the growing availability of mobile devices for students, web-based and shared annotations of learning materials are becoming more popular. Annotating learning material is a method to promote engagement, understanding, and independence for all learners in a shared environment. Open educational resources have the potential to add...
Chapter
One advantage of small group collaboration in online courses is that it can enrich the students learning experience with regard to interactional and social dimensions. In this paper we apply a previously tested method of sequential analysis on group activity sequences. These activity sequences stem from an online course on computer mediated communi...
Article
Full-text available
This paper proposes a methodological approach to explore the ability to detect social media users based on pedestrian networks and neighborhood attributes. We propose the use of a detection function belonging to the Spatial Capture–Recapture (SCR) which is a powerful analytical approach for detecting and estimating the abundance of biological popul...
Chapter
Full-text available
Various approaches of game-based computational thinking (CT) environments were designed to better support the development of CT skills, such as abstraction, algorithmic thinking, generalization, or decomposition. We provide a classification of game-based environments for CT according to their characteristics such as the programming tools offered to...
Chapter
Full-text available
Video is frequently used as a learning medium in a variety of educational settings, including large online courses as well as informal learning scenarios. To foster learner engagement around instructional videos, our learning scenario facilitates interactive note taking and commenting similar to popular social video-sharing platforms. This approach...
Chapter
Handling customer complaints properly, especially through chat or phone-based interaction, has become an increasingly important social skill and is the subject of professional training in companies, markets, and multinational corporations. In order to develop such skills, training methods can involve videos and role plays. Virtual role play scenari...
Conference Paper
Full-text available
Video is frequently used as a learning medium in a variety of educational settings, including large online courses as well as informal learning scenarios. To foster learner engagement around instructional videos, our learning scenario facilitates interactive note taking and commenting similar to popular social video-sharing platforms. This approach...
Chapter
Existing research covers the positive impact of two significant support measures on reciprocal knowledge exchange in small groups: grouping learners with complementary knowledge and enhancing the awareness on co-learners by providing cognitive information on them (cognitive group awareness). Although a combination of both seems obvious, its benefit...
Conference Paper
Full-text available
Although the general principles of Computational Thinking are manifold and not bound to one specific programming paradigm current practice is less varied, dominated by visual block-based approaches following the imperative paradigm. For this study, an environment with an agent in a maze has been made accessible to programming in two different modal...
Chapter
Full-text available
The essence of Computational Thinking (CT) lies in the creation of “logical artifacts” that externalize and reify human ideas in a form that can be interpreted and “run” on computers. Various approaches to scientific inquiry (learning) also make use of models that are construed as logical artifacts, but here the main focus is on the correspondence...
Conference Paper
Establishing small learning groups in online courses is a possible way to foster collaborative knowledge building in an engaging and effective learning community. To enable group activities it is not enough to design collaborative tasks and to provide collaboration tools for online scenarios. Collaboration in such learning groups is prone to fail o...
Article
Full-text available
This paper describes a network reduction technique to reveal possibly hidden relational patterns in information diffusion networks of interlinked content published across different types of online media. Topic specific content items such as tweets (Twitter), web pages, or versions of Wikipedia articles can reference each other through hyperlinks, r...
Chapter
Full-text available
This paper describes Links in Context as a novel approach for detecting and characterising the community structure in networks when further information on the properties of nodes is available. The general idea is straightforward and extends the well-known Link Communities framework introduced by Ahn et al. [1] by additionally taking node attributes...
Article
Full-text available
A methodological approach is developed for exploring the relationship between the use of social networking sites and participation in protest activities. Although a recent meta-analysis study demonstrated that there is a positive association between the two, little work examining this association further appears to have been published. The methodol...
Conference Paper
Full-text available
The application of newly introduced computational constructs is challenging for learners when they start programming from scratch. Basic code examples can be used and modified to help learners exploring these constructs in order to enable a seamless transition to create own programming code. This paper presents a redesign of the game-based learning...
Conference Paper
Full-text available
This paper presents a game-based learning environment supporting the acquisition of computational thinking skills. The game environment offers two types of usage: a guided progression through levels and an open stage. Seven levels of guided learning were evaluated in a study with 40 students to measure their learning progress. We introduce five fea...
Conference Paper
Full-text available
This paper describes an approach for identifying patterns of information diffusion across different media types on the web. In this context, a novel sampling and crawling strategy for social media content has been applied to extract contributions relevant to certain news events. Contributions can be any kind of published content in different inform...
Chapter
Full-text available
Often, users of Social Network Sites (SNSs) like Facebook or Twitter have issues when controlling the access to their content. Access-control predictive models are used to recommend access-control configurations which are aligned with the users’ individual privacy preferences. One basic strategy for the prediction of access-control configurations i...
Chapter
This paper addresses information diffusion across different social media channels. Hereon, the time delay during the diffusion process is taken into account with a new measure. This measure can be used to identify and characterize important contributions and their interdependencies in social media according to their ability to accelerate the diffus...
Chapter
„Cloud Computing“ hat die gesamte IT Landschaft in den letzten Jahren durch neue Architekturen und Servicemodelle nachhaltig verändert. Hieraus ergeben sich auch neue Möglichkeiten der technischen Unterstützung und Orchestrierung von Lernszenarien, insbesondere von mobil gestützten Lernanwendungen. In diesem Kapitel werden aus dieser Perspektive di...
Book
This two volume set LNAI 10947 and LNAI 10948 constitutes the proceedings of the 19th International Conference on Artificial Intelligence in Education, AIED 2018, held in London, UK, in June 2018. The 45 full papers presented in this book together with 76 poster papers, 11 young researchers tracks, 14 industry papers and 10 workshop papers were car...
Chapter
Full-text available
One of the major problems in social media research on networks is the lack of empirical datasets. To avoid this problem, different graph generation models have been proposed to represent real social graphs to an acceptable extent. This enables researchers to try and evaluate new methods on a large number of social media networks. The work described...
Article
Full-text available
Dev Camps are events that enable participants to tackle challenges using software tools and different kinds of hardware devices in collaborative project-style activities. The participants conceptualize and develop their solutions in a self-directed way, involving technical, organizational and social skills. In this sense, they are autonomous produc...
Conference Paper
This paper presents an approach to supporting group reflection in a virtual role-playing environment with intelligent support designed for the training customer complaint management in electronic shops. The single-player design involves a player and an AIML chat bot in a 2D web-based virtual environment. Building on this, a group reflection tool wa...
Article
Full-text available
Dev Camps are events that enable participants to tackle challenges using software tools and different kinds of hardware devices in collaborative project-style activities. The participants conceptualize and develop their solutions in a self-directed way, involving technical, organizational and social skills. In this sense, they are autonomous produc...
Conference Paper
A recent challenge in online learning courses is to establish collaboration in small groups. Group work in such courses often has to take place asynchronously, which puts additional requirements on communication and coordination to organise work in a productive way. This paper presents analyses of sequences of actions performed by such small learni...
Conference Paper
Web-based learning environments such as the Go-Lab portal facilitate the structuring and scaffolding of inquiry processes and enable learners to create various types of knowledge artefacts (texts, concept maps, hypotheses). In this context, we have introduced semantic technologies to extract key concepts from heterogeneous learner-generated artefac...
Conference Paper
To conduct scientific experiments is a central aspect in science education in secondary schools. Online laboratories overcome a variety of deficits and obstacles that complicate in situ experiments, particularly regarding accessibility, availability, financial costs and preparation time. However, such a computer-supported learning approach still de...
Article
Full-text available
Background: Influential actors detection in social media such as Twitter or Facebook can play a major role in gathering opinions on particular topics, improving the marketing efficiency, predicting the trends, etc. Proposed methods: This work aims to extend our formally defined T measure to present a new measure aiming to recognize the actor’s inf...
Chapter
This work aims to explore methods to investigate the structure of knowledge exchange in discussion forums in massive open online courses (MOOCs) explicitly taking into account changing patterns over time. The paper covers three different aspects of forum analysis combining different methods. First, an approach for the extraction of dynamic communic...
Conference Paper
In this integrated study of dynamics in MOOCs discussion forums, we analyze the interplay of temporal patterns, discussion content, and the social structure emerging from the communication using mixed methods. A special focus is on the yet under-explored aspect of time dynamics and influence of the course structure on forum participation. Our analy...
Article
Full-text available
To further develop rich and expressive ways of modelling roles of contributors in discussion forums of massive open online courses (MOOCs), we analyse a networks of forum users based on the relations of information-giving and information seeking. Specific connection patterns that appear in the information exchange networks of forum users are used t...
Article
Full-text available
Background Detection of influential actors in social media such as Twitter or Facebook plays an important role for improving the quality and efficiency of work and services in many fields such as education and marketing. Methods The work described here aims to introduce a new approach that characterizes the influence of actors by the strength of a...
Article
Full-text available
As problem-based learning (PBL) is becoming more and more popular, there is also a growing interest in developing and using technologies in the implementation of PBL. However, teachers may have difficulties to design and deliver a pedagogically well-designed and technically smoothly executable online or blended PBL process on their own because they...
Article
Orchestrating collaborative learning in the classroom involves tasks such as forming learning groups with heterogeneous knowledge and making learners aware of the knowledge differences. However, gathering information on which the formation of appropriate groups and the creation of graphical knowledge representations can be based is very effortful f...
Chapter
Full-text available
Detection of influential actors in social media such as Twitter or Facebook can play a major role in improving the marketing efficiency, gathering opinions on particular topics, predicting the trends, etc. The current study aspires to extend our formal defined T measure to present a new measure aiming to recognize the actors influence by the streng...
Chapter
This paper presents the JuxtaLearn approach to stimulate creativity and engagement in areas of science, technology, engineering, and math (STEM) by guiding the students through a process aiming at the creation of videos on a specific STEM topic. The students are asked to juxtapose their understanding of the topic with creative expression in the for...
Conference Paper
Full-text available
In this paper we propose several new measures to characterize sets of scientific papers that provide an overview of a scientific topic. We present a study in which experts were asked to name such papers for one of their areas of expertise and apply the measures to characterize the paper selections. The results are compared to the measured values fo...
Conference Paper
Experimente sind ein zentraler Bestandteil des (natur-)wissenschaftlichen Unterrichts. Online-Laboratorien überwinden dabei viele Hürden klassischer Experimente in Bezug auf Zugänglichkeit, breite Verfügbarkeit, sowie Zeitaufwand der Bereitstellung. Das Go-Lab Portal bietet Zugriff auf Online-Laboratorien und bettet diese in den Kontext des Inquiry...