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Dive into the research topics where Stephan Trahasch is active.

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Featured researches published by Stephan Trahasch.


Frontiers in Education | 2004

From peer assessment towards collaborative learning

Stephan Trahasch

Peer assessment is one form of innovative assessment which aims to integrate learning and assessment. Peer assessment can also be seen as a special type of collaborative learning, where the task can be specified by using so called collaboration scripts. This implies the application of a more or less rigid schema (collaboration script) for structuring the task. Although peer assessment has positive effects on knowledge acquirement there is a lack of web-based collaborative peer assessment systems. Thus we have implemented a peer assessment application for review and discussion of artifacts. In our approach it is new that students use presentation recording tools to create personal presentations. It is possible to use these continuous documents for peer assessment. With this approach we lift restrictions to submit only static documents for peer review.


international conference on advanced learning technologies | 2004

Learning with lecture recordings: key issues for end-users

Tobias Lauer; Rainer Müller; Stephan Trahasch

Computer-based recording of live presentations has become a widespread method of producing learning materials in both higher education and companies. The success of such contents depends on their acceptance by the end-users working with the materials. From their point of view, the support of certain features and, thus, the choice of formats used for network delivery and replay are crucial issues. We present a list of key factors from the end-users perspective and report on a user study carried out to evaluate a number of formats used for delivering recorded presentations to learners.


frontiers in education conference | 2005

Anchored discussions of multimedia lecture recordings

Tobias Lauer; Stephan Trahasch; Bernd Zupancic

Lecture recording has become a widespread way of producing learning contents rapidly. However, the resulting documents have some disadvantages regarding learner interaction, in particular regarding collaborative learning based on such documents. This paper proposes a model for anchoring group discussions in learning contents in a fine-granular way. Artifact-centered discussion is regarded as collaborative annotation of documents, with an extended data model for annotations which is independent of document and media types. After outlining the generic framework and data model, we describe its application to the scenario of group discussions around lecture recordings. Notes can be anchored both spatially and temporally in the multimedia documents. The infrastructure for sharing notes has been implemented as an Annotation Web Service (AWS), and the player software for viewing recordings has been extended into a client providing thread-based as well as document-centered discussion features


information technology based higher education and training | 2004

Towards a flexible peer assessment system

Stephan Trahasch

Peer assessment is one form of innovative assessment, which aims to integrate learning and assessment. Peer assessment can also be seen as a special type of collaborative learning, where the task can be specified by using so called collaboration scripts. This implies the application of a more or less rigid schema (collaboration script) for structuring the task. Although peer assessment has positive effects on knowledge acquirement there is a lack of Web-based collaborative peer assessment systems. Thus we have implemented a peer assessment application for review and discussion of artifacts. In our approach it is new, that students use presentation recording tools to create personal presentations. It is possible to use these continuous documents for peer assessment. With this approach we lift restrictions to submit only static documents for peer review.


information technology based higher education and training | 2004

Web technologies and standards for the delivery of recorded presentations

T. Lauer; Stephan Trahasch; R. Muller

Computer-based recording of live presentations has become a widespread way of producing content material for e-learning in both higher education institutions and companies. The success of e-learning projects crucially depends on the acceptance by the end-users working with these materials, i.e., learners but also administrators. From their point of view, the choice of formats used for distribution is a crucial issue, regarding network delivery and Web-based replay. We present the key factors from the end-users perspective and discuss a number of widespread and standard formats with respect to their suitability for todays Web-based e-learning.


Quality Education @ a Distance | 2003

Systems support for virtualizing traditional courses in science and engineering

Thomas Ottmann; Stephan Trahasch; Tobias Lauer

Current Internet technology allows traditional campus-based universities to enter the business of distance education. However, they begin to realise not only that the production of rich-media contents for web-based distance courses is extremely expensive, but that offering distance learning also implies that they have to establish new services completely different from their traditional way of teaching. In this paper we argue that the production of e-lectures by presentation recording and the use of e-lectures as the core of web courses may be a possible way out of this trap. We discuss technical requirements influencing the quality of producing and using e-lectures for distance learning


Information Technology | 2013

Lecture Recording — a Success Story

Paul-Thomas Kandzia; Serge Linckels; Thomas Ottmann; Stephan Trahasch

Abstract Today, digital recording of live lectures is a common practice at many universities. This article provides an historical overview of this idea, from the first approaches starting 40 years ago to present-day systems and questions still subject of research. Zusammenfassung Die digitale Aufzeichnung von Vorlesungen ist heute an Hochschulen Alltag. Der Beitrag beschreibt die 40-jährige Entwicklung dieser Idee von den ersten Ansätzen bis zu aktuellen Produkten und heute noch offenen Fragen.


Archive | 2003

From Lecture Recording Towards Personalized Collaborative Learning

T. Fiehn; Tobias Lauer; J. Lienhard; Thomas Ottmann; Stephan Trahasch; B. Zupancic

This paper describes our work in progress of using recorded live lectures as the basis for collaborative learning. The approach supports both the personalization of documents through annotation and the sharing of such notes to stimulate structured discussions anchored directly at the relevant content objects in the multimedia documents. Furthermore, we show how student-authored multimedia documents combined with anchored discussion can be used for peer assessment.


international conference on optoelectronics and microelectronics | 2009

Vorlesungsaufzeichnungen Anwendungen, Erfahrungen und Forschungsperspektiven. Beobachtungen vom GI-Workshop eLectures 2009

Stephan Trahasch; Serge Linckels

Vorlesungsund Vortragsaufzeichnungen (Lauer und Trahasch, 2005) haben sich in den vergangenen Jahren zu einer etablierten und weit verbreiteten Methode zu Erstellung von eLearning-Inhalten entwickelt. Das Lehren und Lernen auf Basis von Videoaufzeichnungen reicht jedoch viel weiter zurück. Beispielsweise wurde in den USA bereits Ende der 50er Jahre unter dem Schlagwort „Home Learning“ der Versuch unternommen, Schülern Wissen durch via Fernsehen ausgestrahlte Lehrsendungen zu vermitteln (vgl. auch Sendungen wie „Telekolleg“ im deutschsprachigen Raum). Ende der 90er Jahre wurden dann an zahlreichen Universitäten Projekte gestartet, um Methoden und Werkzeuge für eine komfortable Erstellung von Lehrmaterialien (im folgenden eLectures genannt) durch meist (teil-)automatisierte synchrone Aufzeichnung von Vorlesungsfolien, zugehörigen Annotationen sowie Sprache und Videobild des Dozenten zu erforschen und zu entwickeln. Mittlerweile sind die Ergebnisse vieler dieser Forschungsprojekte in Produkte eingeflossen, deren Nutzung im täglichen Lehrbetrieb weit verbreitet ist und sich in manchen Bereichen teilweise sogar als fester Bestandteil der Lehre etabliert hat. Die Gründe hierfür sind vielfältig. Beispielsweise können mit Vorlesungsaufzeichnungen eLearning-Inhalte im Unterschied zu Web-Based-Trainings schnell und kostengünstig produziert werden. Es hat sich auch gezeigt, dass Vortragsaufzeichnungen von den Studierenden akzeptiert und mitunter sogar gefordert werden, da die heutige Generation der Studierenden audiovisuelle Medien viel selbstverständlicher nutzt und als gleichwertige Informationsquelle zu traditionellen Medien (Textbücher, etc.) akzeptiert hat. Trends wie Podcasting und Initiativen wie iTunes U von Apple haben das Interesse an Möglichkeiten zur Aufzeichnungen von Vorträgen und der Produktion von Podcasts weiter gesteigert. Aufgrund dieser Entwicklung scheint es auf den ersten Blick verwunderlich, dass der Arbeitskreis „Vortragsaufzeichnung und eLectures“ der Fachgruppe eLearning der Gesellschaft für Informatik (GI) auf der gemeinsamen Pre-Konferenz der diesjährigen DeLFIund GMWTagungen einen weiteren Workshop zum Thema Vorlesungsaufzeichnungen veranstaltet hat, der sich insbesondere mit aktuellen Forschungsthemen und -perspektiven beschäftigen sollte. Der große Andrang (mit über 40 Teilnehmern war dies eine der bestbesuchten Veranstaltungen der Pre-Konferenz) sowie Anwendungsund Erfahrungsberichte aus der täglichen Praxis belegen jedoch eindrucksvoll, dass dieses Forschungsfeld mitnichten erschöpfend behandelt ist, sondern sich vielmehr durch den routinemäßigen Einsatz sowie die oben bereits angedeuteten technologischen Weiterentwicklungen und Trends eine ganze Reihe weiterer Forschungsfragen und Herausforderungen ergeben. Die Beiträge sowie Diskussionen auf dem diesjährigen Workshop zeigen, dass sich die Themen von den ursprünglichen Fragestellungen nach den technischen Anforderungen einer Plattform für Vorlesungsaufzeichnung und dem Sinn von eLectures wegbewegen hin zu angrenzenden Forschungsbereichen wie Multimedia, Information-Retrieval, Semantik Web, Mensch-Computer-Schnittstelle und didaktischen Aspekten und Szenarien eines effizienten Einsatzes in der Lehre. Im Folgenden illustrieren wir anhand der im Workshop behandelten Beiträge derartige Trends und aktuelle Forschungsthemen im Zusammenhang mit eLectures. Bezüglich der zitierten Artikel sei auf die Workshop-Proceedings verwiesen (Trahasch et al. 2009).


Archive | 2007

Scripted Anchored Discussion of Multimedia Lecture Recordings

Tobias Lauer; Stephan Trahasch

Lecture recording has become a widespread way of producing e-learning contents. The resulting documents, however, are usually limited with respect to collaborative learning. This chapter introduces the concept of scripted anchored discussion as a means to facilitate net-based group collaboration around multimedia lectures. Discussion contributions are anchored at specific spatial and temporal positions within the document, allowing both document-centred and discourse-centred views of the discussion. Cooperation scripts are used to structure and sequence the discussion process. A formal model is pro-posed to represent discussion scripts. Furthermore, we explore ways to fade out scripting instructions in order to adapt to users’ increasing internalization of the scripts.

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Hans-Rüdiger Pfister

Center for Information Technology

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B. Zupancic

University of Freiburg

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