• Publikationen
Show publication details

Hornung, Christoph [Betreuer]

Festschrift: From Computer Graphics to Visual Computing (1975-2015)

2015

Computer Graphics - today this is a well established field in science and technology. It offers leading-edge functionality to provide a level of flexibility, adaptability, and re-usability not possible even a few years ago. It is an indispensible part of our daily life, the Internet revolution would not have been possible without easy to use interfaces of smart phones and tables. It is hard to believe, that only about 40 years ago, Computer Graphics evolved as a selfstanding discipline. The Technical University formed the nucleus of Computer Graphics in Germany by establishing a professorship for "Graphische Datenverarbeitung (GRIS)" in 1975. This special issue is dedicated to 40 Years of Computer Graphics in Darmstadt, its foundation, growth and establishment in research, technology, and a broad range of application fields. This special issue consists of a survey of 40 Years of Computer Graphics in Darmstadt, scientific papers from GRIS alumni and Words of welcome from pioneers of Computer Graphics standing in longtime connection with Darmstadt.

Show publication details

Hornung, Christoph; Encarnação, José L.; Fellner, Dieter W.

Introduction: Guest Editor Foreword

2015

Computers & Graphics

Computer Graphics - today this is a well-established field in science and technology. It offers leading-edge functionality to provide a level of flexibility, adaptability and re-usability not possible even a few years ago. It is an indispensible part of our daily life ,the Internet revolution would not have been possible without easy to use interfaces of smartphones and tablets. It is hard to believe, that only about 40 years ago, Computer Graphics evolved as a selfstanding discipline. Technische Universität Darmstadt formed the nucleus of Computer Graphics in Germany by establishing a professorship for "Graphische Datenverarbeitung (GRIS)" in 1975.This special issue is dedicated to 40 Years of Computer Graphics in Darmstadt, its foundation, growth and establishment in research, technology, and a broad range of application fields. It consists of a survey of 40 Years of Computer Graphics in Darmstadt, scientific papers from GRIS alumni and Words of Welcome from pioneers of computer graphics standing in long time connection with Darmstadt.

Show publication details

Nazemi, Kawa; Ullmann, Thomas Daniel; Hornung, Christoph

Engineering User Centered Interaction Systems for Semantic Visualizations

2009

HCI International 2009. Proceedings and Posters [DVD-ROM]

International Conference on Universal Access in Human-Computer Interaction (UAHCI) <5, 2009, San Diego, CA, USA>

For intuitive interaction with semantic visualizations, gesture-based interaction seems a promising way. However, the development of such ensembles is costly. To cut down the engineering effort, we propose a development model for interaction systems with semantic visualizations. In addition, we provide a set of evaluation tools to support the interaction developer engineer evaluating the engineering process.

Show publication details

Nazemi, Kawa; Breyer, Matthias; Hornung, Christoph

SeMap: A Concept for the Visualization of Semantics as Maps

2009

HCI International 2009. Proceedings and Posters [DVD-ROM]

International Conference on Universal Access in Human-Computer Interaction (UAHCI) <5, 2009, San Diego, CA, USA>

The enhancement of the individual knowledge is a basic need that came up with changes in our society, whereas the process of learning disappears more and more. In the recent past the disappearance of a predefined learning process was named ambient learning, which came up to cope the changing need of every time and everywhere learning. Learning contents get more structure by new technologies like semantics, which specifies and defines more the semantic structure and with it the meaning of information. Users working with information system are confronted with different processes for getting the required information. The following paper introduces a new visualization technique, which uses the everyday processes of information search for imparting knowledge. The visualization technique utilizes the surplus of semantics to encourage the process of ambient learning.

Show publication details

Burkhardt, Dirk; Nazemi, Kawa; Bhatti, Nadeem; Hornung, Christoph

Technology Support for Analyzing User Interactions to Create User-Centered Interactions

2009

HCI International 2009. Proceedings and Posters [DVD-ROM]

International Conference on Universal Access in Human-Computer Interaction (UAHCI) <5, 2009, San Diego, CA, USA>

Alternative interaction devices become more important in the communication between users and computers. Parallel graphical User Interfaces underlay a continuous development and research. But today does no adequate connection exist between these both aspects. So if a developer wants to provide an alternative access over more intuitive interaction devices, he has to implement this interaction-possibility on his own by regarding the users perception. A better way to avoid this time-consuming development-process is presented in this paper. This method can easy implement by a developer and users get the possibility to interact on intuitive way.

Show publication details

Hornung, Christoph; Granic, Andrina; Cukusic, Maja; Nazemi, Kawa

eKnowledge Repositories in eLearning 2.0: UNITE - A European-Wide Network of Schools

2008

Advances in Web Based Learning - ICWL 2008

International Conference on Web-based Learning (ICWL) <7, 2008, Jinhua, China>

The upcoming Web 2.0 technologies change the aspects of eLearning fundamentally. The traditional paradigm of classroom teaching and homework learning will develop further towards sharing experiences and knowledge in word-wide social communities. Moreover, knowledge capturing in ambient environments gains more and more importance. These aspects characterize the so-called eLearning 2.0. This paper describes a prototype of an eLearning 2.0 system covering the different aspects such as platform, pedagogy and scenarios. The concepts presented here have been applied in the EU-project UNITE. The implementation of this system in the setting of a European network of fourteen schools is presented as an iterative four stage process, covering scenario planning and implementation, validation in addition to platform and process improvement. Achieved intermediate results from the first iteration of the implementation process are discussed and future work is presented.

Show publication details

Nazemi, Kawa; Hornung, Christoph

Intuitive Authoring on Web: A User-Centered Software Design Approach

2008

Proceedings of ED-Media 2008

World Conference on Educational Multimedia, Hypermedia & Telecommunications (ED-Media) <2008, Vienna, Austria>

To motivate users to work with computer-based systems, to enhance their usage frequency, and to avoid that users get frustrated while working with computer-based systems, it is necessary to respond to the users as much as possible. User-centered software approaches try to assume all the wishes and demands of users. This paper presents a step-by-step introduction to a user-centered software development process. First, a definition of the term "intuitive" in the context of software development will be given. Furthermore, the development process will be explained as a combination of existing user-centered design processes. The implementation of an authoring tool in the European UNITE project, which uses the presented design approach, gives an insight into the development process and the results of the design approach.

Show publication details

Nazemi, Kawa; Bhatti, Nadeem; Godehardt, Eicke; Hornung, Christoph

Adaptive Tutoring in Virtual Learning Worlds

2007

Proceedings of ED-Media 2007

World Conference on Educational Multimedia, Hypermedia & Telecommunications (ED-Media) <2007, Vancouver, BC, Canada>

To enhance the learning success of the learners in the Virtual Learning Worlds (VLW) and effective of VLW, the aspects like precognition and learning aptitude of the learners play a key role. The constructivistic approach based VLW not only offers learning, but also great experience by exploring through reality based virtual worlds. VLWs can be extended with such a Learning Environment. They are Novices or Beginner and need more explanations and instructions to understand a topic and resolve a given problem. An Adaptive Tutoring System tries to find out the differences in precognitions and learning aptitudes and offers the learning task depending on these parameters. In the following paper a new system is designed for adapting a VLE to learners' need and presenting the learning tasks based on the recommended pedagogical approach.

Show publication details

Godehardt, Eicke; Hornung, Christoph

Distributed Authoring in the Area of eLearning

2005

TESI 2005 Conference Proceedings CD-ROM

Training, Education & Simulation International (TESI) <2005, Maastricht, Netherlands>

To support distributed groups of authors it is not only necessary to provide convenient software components, but also mechanisms to enable sharing and reuse between authors. For this purpose, we have developed a central repository called InfoPool. With this InfoPool, content elements from every level of granularity can be handled, from small assets, like pictures and animations, up to complete courses. To ensure reusability two things are needed: context independent content and the software to find it. The InfoPool makes it possible to describe every element with metadata in an easy and comfortable way, no matter of what granularity the content is. These metadata is stored in a SCORM compliant manner. On this basis, it is possible to search and collect content from cooperating authors and reuse it in new contexts. Even if an element is changed on a relative low level, e.g., misspelling or reworked illustrations, the correction is reflected in each level above.

Show publication details

Godehardt, Eicke; Bhatti, Nadeem; Hornung, Christoph

Keeping the Learning History

2005

Proceedings of ED-Media 2005

World Conference on Educational Multimedia, Hypermedia & Telecommunications ED-Media <2005, Montréal, Canada>

Life long learning is essential today. To support learner as well as the teacher in this learning process by computer systems is a logical consequence. This paper describes the new approach in keeping the learning history, by getting and storing the data of the learning history or learning profile. It tries to show the conclusions that can be drawn out of the learning history. Afterwards it is shown what the next steps in learning system design are and what potential the learning history has, when it is used in the best way.

Show publication details

Bhatti, Nadeem; Godehardt, Eicke; Hornung, Christoph

Modular Virtual Learning World

2005

Proceedings of ED-Media 2005

World Conference on Educational Multimedia, Hypermedia & Telecommunications ED-Media <2005, Montréal, Canada>

Web-based Three-dimensional collaborative and impressive Virtual Learning Environments (VLE) offer considerable promise for the design of effective constructivist learning environments. Collaboration within a VLE enables learners to carry out tasks in groups, which offers beside the knowledge exchange a platform for training social competences and teamwork capabilities. In this paper, the design and concept of a new framework called "Modular virtual Learning World" (MLW) is described. MLWs are collaborative and immersive VLEs and offer modular and customizable solutions to enhance VLE building process for enterprise training and vocational training. An ongoing project called "Virtual Car Dealer" (VAH, in German "Virtuelles AutoHaus") based on the MLW is also presented. It is designed to support German vocational training system. In addition, different aspects of VAH like pedagogical support, virtual learning environment and learning scenario are described.

Show publication details

Bhatti, Nadeem; Hornung, Christoph

Virtual Learning World

2005

TESI 2005 Conference Proceedings CD-ROM

Training, Education & Simulation International (TESI) <2005, Maastricht, Netherlands>

Virtual Learning World (VLW) is an e-Learning system, where the Virtual Worlds are used for educational purposes. This paper describes the design and concept of the VLW and shows the "Virtual Car Dealer>" (VAH, in German Virtuelles AutoHaus) as one example of it. The VAH has been designed as a complement to German vocational training. It supports the education in the classroom and training in companies. Learners are represented by avatars in VAH. They can interact with objects, use abstract applications and forms and communicate with each other in order to perform car dealer facility's specific tasks like car sales and customer services. The abstract applications are car dealer facility's specific application like inventory, booking and accounting and are used to sustain the state of VAH. Learner can change the state of VAH by using the abstract application. Consequently, the system possesses time variant and dynamic learning exercises.

Show publication details

Encarnação, José L.; Hornung, Christoph

E-Learning und Knowledge Management

2002

Angewandte Systemforschung

In Zukunft werden Arbeitsprozesse zunehmend wissensbasiert durchgeführt werden. Daher werden der Wissenaustausch und die Verbesserung des Unternehmenswissens zu einem entscheidenden Wettbewerbsfaktor werden, der nur von Lernenden Organisationen überdurchschnittlich erfüllt werden kann. Lernende Organisationen sind Gruppen von Personen, die ihre Fähigkeit und ihr gemeinsames Wissen kontinuierlich erweitern, um ihre Ziele als Organisation zu erfüllen. Lernen mit Hilfe elektronischer Medien (e-Learning) und Knowledge Management sind Schlüsseltechnologien für den Aufbau von Lernenden Organisationen. Die Nutzung von Wissen, das im Internet zur Verfügung steht (e-Knowledge), für Trainings-, Lern- und Qualifizierungszwecke ist dabei essenziell. Das Fraunhofer Institut für Graphische Datenverarbeitung führt auf diesem Gebiet F&E-Projekte durch und nutzt e-Learning und Knowledge-Management-Techniken intern sowie zur Präsentation der erzielten Ergebnisse nach außen. Für die nahe Zukunft ist die Entwicklung einer einheitlichen e-Knowledge-Strategie geplant, die auf den Ergebnissen der verschiedenen derzeit durchgeführten Vorhaben basiert und die hieraus erzielten Ergebnisse zusammenführt. Weiterhin ist vorgesehen, sich verstärkt dem Multi-User-Training in virtuellen Umgebungen zu widmen.

Show publication details

Hornung, Johanna; Hornung, Christoph; Oliveira, Alexandre; Marcos, Adérito

Knowledge Visualization based on Topic Maps for Computer-Based Learning Applications

2001

The Future of Learning - Learning for the Future: Shaping the Transition

World Conference on Open Learning and Distance Education (ICDE) <20, 2001, Düsseldorf>

We are living in a world where everyday more and more information is being produced. One of today s challenge faced by developers in the field of Knowledge Management is research an the search of new paradigms to deal efficiently with large amount of knowledge and to ease the discourse between human and the growing global and corporate information resources. In fact, it is worth to mention that, usually, too much information means no information at all. The new Topic Map concept can help to structure large knowledge domains. Topic Maps is a method for organizing information resources according to topics without changing its original form. The knowledge is described at several levels, and the information is structured by using a "hub paradigm". Topic Maps aim to create this structured information so that fast access to queried information and intelligent-like navigation can be provided. Topic Maps provide a semantic layer that is not hierarchical, although it could be visualized that way. In this paper, we present a new comprehensive model, based on Topic Maps, to structure and organize information in context with state-of the art Web-learning environments. The main objective here is to provide fast and intuitive access to learning material in networked environments.

Show publication details

Hornung, Christoph

Knowledge Management in lernenden Organisationen

2000

Thema Forschung

Show publication details

Jiang, Lijun; Hornung, Christoph [Betreuer]

Konzeption und Realisierung eines Editors zur graphischen Komposition von Interface JavaBeans

1999

Darmstadt, TU, Diplomarbeit, 1999

Show publication details

Encarnação, José L.; Hornung, Christoph

Wissensmanagement in lernenden Organisationen - Visionen zur Wissensgesellschaft

1999

Electronic Business und Knowledge Management - Neue Dimensionen für den Unternehmenserfolg

Saarbrücker Arbeitstagung für Industrie, Dienstleistung und Verwaltung <20, 1999, Saarbrücken >

Show publication details

Encarnação, José L.; Mengel, Maximilian; Bono, Peter R.; Böhm, Klaus; Borgmeier, Elmar; Brisson Lopes, J.M.; Hornung, Christoph; Knierriem-Jasnoch, Anette; Koch, Eckhard; Krömker, Detlef; Lindner, Rolf; Paris, Cesar; Sandberg, A.; Schnaider, Michael; Storck, Dietmar; Teixeira, José Carlos; Urban, Bodo; Wang, Taofen

A Concept and System Architecture for IT-Based Lifelong Learning

1998

Computers & Graphics

This article presents the vision "A Concept and System Architecture for IT-Based Lifelong Learning". The paper as a whole summarises the results of a project funded by the Ministry of Industrial Development of Sabah, Malaysia. The goal of the project was to develop a concept for IT-based Lifelong Learning including a case study based on a specific curriculum and considerations about potential business opportunities. Within the project experienced international researchers in the area of IT-based learning and training worked together in two preparation workshops and a final workshop about "IT-Based Lifelong Learning Systems" in Sabah, Malaysia, in March, 1997. The paper is based on the experiences of the authors from the International Network of Institutes for Computer Graphics (INI-GraphicsNet) in several R&D projects and has been reviewed, refined and revised by a group of local experts as well as several well renowned international experts and local/regional experts (Appendix A). The editors of the vision paper are J. L. Encarnacao, M. Mengel and P. R. Bono. Section 1 presents first the motivation of the paper, then international trends and the vision of an IT- based learning infrastructure integrating all parts of the society. The resulting goal, advising on how to go forward into the direction of the named vision, finalizes the Introduction. Section 2 discusses the various roles of an IT-based learning environment and identifies user needs and requirements. Section 3 proposes concepts for, and an architecture of, a learning system for IT-based lifelong learning. Section 4 focuses on the Technical Implementation of the proposed system architecture. A generic approach for IT-based lifelong learning based on a conceptual system architecture is presented. This approach distinguishes between the services and environment of such a system. Firstly, the services offered by the system are described in more detail. These services include data management, cooperation and security services that are role- and activity-independent and have to be adapted to the underlying technical resources. Then the environments, including authoring, delivery and administration environments realizing a specific functionality for a specific user role and activity, are presented. The section is completed by addressing issues for a concrete implementation including implementation guidelines and assessment criteria and an implementation strategy to reduce the technological risk is suggested. Section 5 describes a case study which will be initiated cooperatively by leading experts from the fields of visualization, multimedia, interaction and communication. This case study provides a narrow vertical section through the layers of the approach to lifelong learning both to demonstrate its effective- ness and to permit the evaluation of its efficiency. Section 6 outlines a plan for the realization of the project as a whole. A glossary and bibliography complete the main part of the paper. In Appendix B (Recommendations), Appendix C (Project References), and Appendix D (Open Issues), are presented. # 1998 Elsevier Science Ltd. All rights reserved.

Show publication details

Kester, Ulf; Hornung, Christoph

CORBA-Based Frameworks for Cooperative Distributed Simulation and Validation of Complex Technical Systems

1998

Concurrent Engineering: The Way Forward. 5th ECEC 1998

European Concurrent Engineering Conference: The Way Forward <5, 1998, Erlangen-Nuremberg>

This paper describes frameworks for cooperative distributed simulation and validation environments. Starting with requirements of such systems a corresponding set of CORBA-based frameworks is presented. The frameworks' focus is on integration and configuration of simulators, modelling the validation process with test procedures, user interaction and support for cooperation and communication. Configuration of the environments based on sets of predefined modular components, dynamic distribution with CORBA wires and data visualization with virtual instruments based on Java are the key concepts of this approach.

Show publication details

Hornung, Christoph; Bröning, Sylvia

I*net-based Training on Demand Potential of the Usage of Modern IT-Technologies in Industrial Training, Re-Training, and Qualification

1998

Online Educa Berlin. Book of Abstracts

International Conference on Technology Supported Learning <4, 1998, Berlin>

Show publication details

Effelsberg, Wolfgang; Hornung, Christoph

Lehren und Lernen im Internet

1998

it + ti - Informationstechnik und Technische Informatik

The increasing usage of multimedia and Internet-technologies creates new possibilities for teaching and learning. Tele-presence scenarios and the access to worldwide distributed, dynamically changing resources support the forming of interactive groups for authoring, teaching and learning. Moreover, new kinds of role based learning can be supported. This paper presents different application scenarios, characterizes new forms of knowledge management in the Internet, describes networking aspects for information access and human interaction and gives an outlook to the development of Internet-based teaching and training systems.

Show publication details

Hornung, Christoph; Schrödter, Frank; Wang, Taofen; Borgmeier, Elmar

Lehren und Lernen im Intranet

1998

MultiMedia und TeleLearning. Lernen im Cyberspace

Die effiziente Weiterbildung der Mitarbeiter ist fuer viele Unternehmen zu einem Schluesselfaktor geworden. Entsprechend hoch ist das Interesse an computerunterstuetzter Weiterbildung. Trotzdem hat sich Schulungssoftware in der Praxis bisher nicht im erwarteten Masse durchgesetzt. Es besteht daher die Erwartung, dass sich dies mit der Verbreitung von Inter- und Intranet-basierten Schulungskursen aendern wird. Durch Online-Zugriff und die einfache Bedienbarkeit von WWW-Browsern kann Lernen am eigenen Arbeitsplatz in sehr benutzerfreundlicher Weise realisiert werden. Dabei kommt es darauf an, durch entsprechende Gestaltung des Schulungssystems die vorhandenen Moeglichkeiten des WWW um trainingsspezifische Funktionalitaeten zu erweitern, um so auch aus didaktischer Sicht befriedigende Loesungen bieten zu koennen. In diesem Kapitel wird eine vierstufige Architektur fuer Intranet-basierte Schulungssysteme vorgeschlagen und die diesem Konzept entsprechende Realisierung des Fraunhofer-Institutes fuer Graphische Datenverarbeitung (Fh-IGD) und seiner Projektpartner dargestellt. Abschliessend wird der Einsatz des Systems in einem Industrie- und einem europaeischen Forschungsprojekt gezeigt.

Show publication details

Hornung, Christoph; Encarnação, L. Miguel; Barton, Robert J.

PLATINUM. Worldwide Distributed Courseware Production, Learning and Training using MTS

1998

WebNet 98 - World Conference of the WWW, Internet & Intranet. Proceedings. Bd. 1

WebNet - World Conference of the WWW, Internet & Intranet <3, 1998, Orlando, FL, USA>

This paper presents the modular training system MTS, the PLATINUM-Net, a worldwide network for innovative learning and advanced training, and distributed collaborative training on demand as well aws cross-media delivery of course materials as demanding application scenarios. The MTS system anticipates tomorrow's learning scenarios by providing flexible, on-demand, user-adaptive, co-operative, telematics-based, distance learning services. MTS allows efficient and effective co-authoring of courseware and flexible, personalized, cost-effective learning for users. Based on a flexible modular courseware concept, the MTS fosters the collaboration of multiple authoring teams in the development of global courseware domains

Show publication details

Wang, Taofen; Hornung, Christoph

A Modular Training System (MTS). A System Architecture for Internet-based Learning and Training

1997

International Conference on Virtual Systems and MultiMedia. VSMM '97. Proceedings

International Conference on Virtual Systems and MultiMedia (VSMM) <3, 1997, Geneva, Switzerland>

Based on the results of and experience gathered during several national and international training and teaching projects, this paper proposes a new style of learning in the upcoming information age and addresses an open framework for internet-based learning and training using WWW technology. After the introduction of the virtual learning and training environment as the modern CBT infrastructure, the courseware concepts based on the modularity with separation of the course framework from the course contents and with the separation of the course material from the course material description are discussed in this paper. The concept virtual references is introduced to support the late binding of courseware components. User adaptation is supported by using special exploration and examination components. In order to realize the concepts, a system architecture pf am omtermet-based CBT system "Modular Training System (MTS" and its functionality including courseware production, courseware presentation and administration are presented.

Show publication details

Hornung, Christoph; Kühnapfel, Bettina; Lux, Gregor

MUSE: Cooperative Design of Complex Heterogeneous Systems

1997

GEN `97 - International Symposium on Global Engineering Networking

International Symposium on Global Engineering Networking (GEN) <1997, Antwerp, Belgium>

The objective of the MUSE (Multimedia Systems Engineering) system is to advance the quality and the efficiency of the cooperative and interdiciplinary design of process (requirements analysis and conceptual design) are supported. MUSE provides an uniform software environment for engineers of several disciplines e.g. computer science, electrical and mechanical engineering. To realize this property the MUSE concept bases on a Gerneric Laboratory Frame form which special laboratories are derived. This Frame is implemented as a set of cooperating frameworks and allows both the implementation of a uniform design concept as well as it eases the reuse of proven basic methods. An integrated modeling and validation concept bases on so called Virtual Experiments which consist of models, environments and measuring instruments. these Virtual Experiments allow the formulation of validation processes in an abstract manner and support adequate views for different users in the validation of MUSE models in different design phases. The underlying design pattern for the validation in MUSE is the concept of Virtual Components. They provide a methodology for structuring complex validation environments into simpler ones as well as for embodying all the necessary aspects of the objects in the validation process

Show publication details

Böhm, Klaus; Hornung, Christoph; Lindner, Rolf

The IDEALS Modular Training System

1997

Thema Forschung

The modular training system MTS, which was developed within the European project IDEALS , anticipates tomorrow's learning scenarios by provieding flexible, on-demand, user-adaptive, co-operative telematics based distance learning services to Small and Medium Enterprises and Institutes of Higher Education. MTS allows efficient and effective co-authoring of courseware and flexible, personalised, cost-effective learning for users. MTS uses the World Wide Web technolgy for transmission and presentation of and interaction with sophisticated CBT courses. Learning and Trainig Centres (LTCs) interconnecyed to form a European network, facilitate on-line access to MTS-courses, provide on- and off-line support for authoring and training as well as administrate course-usage.

Show publication details

Marcos, Adérito; Hornung, Christoph

Towards the Process of "Transforming" Traditional Stand-alone Environments into Cooperative Ones

1997

Online Cooperation Berlin - International Conference on Teleworking. Book of Abstratcs

International Conference on Teleworking <1997, Berlin>

Stand-alone work is the most common form of man-machine interaction since the beginning of the computer era. The user interacts only and exclusively with the machine, by asking for and obtaining services from it. In contrast to cooperative environments, no form of collaboration with other users is considered. In this paper we present a widespread cooperative model as also technical strategies for the support of groupwork facilities in stand-alone environments. We will introduce a testbed system - VirtualX (Virtual multimedia environment of X), which allows small groups to establish a common cooperation framework while keeping to work in their own local workspaces. These last may be turned 'sharable' and made 'cooperative' to other group members.

Show publication details

Kühnapfel, Bettina; Hornung, Christoph

VIVA: Virtual validation in conceptual design

1997

IASTED 1997

IASTED International Conference on Modeling, Simulation and Optimization <1997, Singapore>

This paper presents VIVA, an environment for validation and its underliying conceptual model for reusable experiments. The new aspects of this approach are the strict separation betwee nodels, environment and measuring instruments as well as the distinction between objects and processes involved in the validation process. This concept allows an easy, object-oriented implementation and, herewith, the design of reusable validation software environments.

Show publication details

Lobo Netto, Marcio; Lange, Brigitta; Hornung, Christoph

Assisting the Design and Optimization of High Quality Parallel Renders

1996

High Performance Computing for Computer Graphics and Visualization

International Workshop on High Performance Computing for Computer Graphics and Visualization (HPCGV) <1995, Swansea, UK>

This Chapter presents DOMAIN, an integrated software environment for development of parallel programs and its use to distribute RAYVOLUTION, an evolutionary ray tracer. DOMAIN combines different types of tools and services to assist the design and the execution of parallel applications. By previous work on distributing renderer algorithms it has turned out that it is of significant help to have an interactive general purpose support with a graphical user interface, and therefore we have conceived DOMAIN to provide this support.

Show publication details

Hornung, Christoph; Borgmeier, Elmar; Wang, Taofen

Teaching and Training in Intra- and Internet

1996

Online Educa Berlin.

International Conference on Technology Supported Learning <1996, Berlin>

Based on the results of and experience gathered during several national and international training and teaching projects, this paper addresses key issues in the design, realisation and usage of a telematics based training environment for the future. First upcoming requirements for training environments are idetified. Then, after introducing projects, we present an estimation of the expected efficiency trade-off in courseware production is given.

Show publication details

Encarnação, José L. [Ed.]; Hornung, Christoph [Betreuer]; Osterfeld, Utz [Ed.]

Telekommunikationsanwendungen für kleinere und mittlere Unternehmen

1996

Springer

3-540-61752-3

Show publication details

Hornung, Christoph

Einsatz von Multimedia und CSCW in GIS

1995

Geographische Informationssysteme <1995, Wiesbaden>

Show publication details

Pantoquilho, Marco Antonio Botelho; Hornung, Christoph [Betreuer]

Offline Cooperation in Environments of Multimedia Editing Sessions

1995

Darmstadt, TH, Diplomarbeit, 1995

Show publication details

Hornung, Christoph; Marcos, Adérito

Software Development: a cooperative approach

1995

COOP '95. Proceedings

International Workshop on the Design of Cooperative Systems (COOP) <1995, Antibes-Juan-les-Pins, France>

Computer-Supported Cooperative Software Development (CS-CSD) encompasses the questions of furnishing the necessary conditions for a successful teamwork on software development, being people workstations located in the same room or distributed among several remote places and connected over network. The aim of the current paper is to bring together aspects of the CSD process and propose a global environment to support it. Our considerations are mainly based on the experience acquired during the development of our own CSD prototype, which enables groups of 2 to 6 developers to cooperate during the various phases of a software project. A cooperative multimedia editing environment is available for the whole development cycle, including mechanisms of computer-conferencing (text, audio and video communications).

Show publication details

Marcos, Adérito; Martins, Jose; Hornung, Christoph

Using Hypermedia to support Meta-Editing of Multimedia Editing Sessions

1995

7ø Encontro Português de Computação Gráfica

Encontro Português de Computação Gráfica (EPCG) <7, 1995, Lisboa, Portugal>

A Multimedia Editing Session (MES) is conceptually only a (volatile) mean to achieve a final goal (a document). There is no possibility to observe the intermediate editing actions performed during the session nor to change them or their initial sequence, i.e., there is no history. This paper examines the importance of keeping history information of MES and provide their effective management as concrete objects. A global solution to support their creation and subsequent manipulation (Meta-Editing) through hypermedia strategies is presented. A related prototype is described along with main concepts and decisions applied on it.

Show publication details

Hornung, Christoph

Wiederverwendbarkeit tausender Objekte mit grafischen Techniken

1995

Informatik Spektrum

Objektorientierung und Computer-Graphik bilden ein interessantes Gespann: Einerseits laesst sich die Programmierung durch graphische Unterstuetzung vereinfachen, andererseits beeinflusst Objektorientierung verschiedene Forschungsrichtungen im Bereich der Computer- Graphik. In diesem Interview wird speziell auf die Bedeutung des Graphikstandards PREMO sowie auf das Businessreengineering mithilfe objektorientierter Methoden eingegangen.

Show publication details

Tritsch, Bernhard; Hornung, Christoph

Co-operative Multimedia on Heterogeneous Platforms

1994

Multimedia

Dagstuhl-Workshop, 02.11.-04.11.92 (9245)

Dieser Artikel geht auf die speziellen Anforderungen der Anpassung und Konfigurierung von CAD-Systemumgebungen im Hinblick auf eine staerkere Aufgabenorientierung der CAD-Prozesse und auf eine konsistent und flexibel gestaltete CAD-Benutzungsoberflaeche ein. Hierbei ist eine objekt-orientiert beschriebenen Systemarchitektur nach Massgabe des CAD-Referenzmodels (Ref. 1992) die konzeptuelle und systemtechnische Basis zur Umsetzung. Konfigurierung wird in diesem Aspekt als dynamische Konfigurierung von CAD-Systemfunktionalitaeten verstanden, die in einem verteilten und offenen CAD-System, bestehend aus mehreren miteinander kooperierenden CAD-Applikationen, eine intrinsische Systemfunktionalitaet darstellt. Ferner stellt dieser Systemansatz eine wesentliche Anforderung an die aufgabenorientierten Konfigurationsmoeglichkeiten der Benutzungsoberflaeche, die sich flexibel an diese Systemfunktionalitaet anpassen lassen muss, um dem Benutzer bestmoegliche System-Transparenz zu bieten. Mehrnoch sollte sich die Benutzungsoberflaeche mit einer ueber mehrere CAD-Applikationen hinweg einheitlichen Benutzungsfuehrung darstellen, die sich nach Layout, Funktionalitaet der Bedienungselemente und nach Art der Dialogabarbeitung richtet.

Show publication details

Hornung, Christoph; Noll, Stefan; Encarnação, José L.

Computer-Supported Cooperative Work (CSCW): Stand und Perspektiven

1994

it + ti - Informationstechnik und Technische Informatik

Computer-Supported Cooperative Work (CSCW) führt neue Technologien und Anwendungen ein, welche Kommunikation und Verteilung von Informationen zwischen Personen und innerhalb von Gruppen unterstützen. CSCW-Systeme und -Anwendungen, die Gruppenarbeit unterstützen, werden eine immer größere Bedeutung bekommen, insbesondere auch wegen des Ausbaus an Computer-Verbindungen, ISDN, Hochgeschwindigkeitsnetzen und vernetzten Rechnerumgebungen. In diesem Beitrag wird nach einer kurzen Einführung in CSCW ein beispielhafter Überblich aktueller Entwicklungen im Bereich CSCW, CSCW-Werkzeuge und CSCW-Anwendungen gegeben.

Show publication details

Lobo Netto, Marcio; Hornung, Christoph

DOMAIN - Integrated System for Development of Parallel Programs

1994

IEEE/EPUSP International Workshop on High Performance Computing. Proceedings

IEEE/EPUSP International Workshop on High Performance Computing <1994, São Paulo, Brazil>

This paper presents DOMAIN, an integrated software for development of parallel programs. I has been conceived to provide support for design, configuration, evaluation and optimization of parallel and distributed programs. It offers a programming model that leads to the independence between the conceptual distribution and its implementation. This facility enables a better adjustment of a certain program distribution to an available hardware platform. DOMAIN provides also a set of tools and services to assist the development and optimization phases.

Show publication details

Marcos, Adérito; Hornung, Christoph

Using Multimedia to Support Cooperative Software Development

1994

6ø Encontro Português de Computação Gráfica

Encontro Português de Computação Gráfica (EPCG) <6, 1994, Braga, Portugal>

The aim of this paper is to propose a global solution to support Cooperative Software Development (CSD) through a multimedia environment. CSD systems have as main goal to enable several users connected over a network to wirk together in order to develop software products. They have to solve problems such as: cherence maintenance of the software project through the distributed system by managing possible convlicts between local versions of each group member and, above all, promote the necessary mechanisms for the inter-group awareness and integrity. We introduce here the strategies of our own CSD prototype: a computer-supported cooperative work architecture for software development. It enables a group of developers (2 to 4), possibly located at remote places and connected over network, to develop software together. A cooperative multimedia editing environment is available for the whole Development Cycle, enclosing mechanisms of computer-conferencing (text, audio and video communications).

Show publication details

Hornung, Christoph; Lange, Brigitta

A Solution to Global Illumination by Genetic Algorithms

1993

Artificial Neural Nets and Genetic Algorithms '93. Proceedings

Artificial Neural Nets and Genetic Algorithms. International Conference <1993, Innsbruck, Austria>

A new approach to optimize the computer simulation of radiant light transfer by means of evolutionary techniques for the generation of photorealistic images is introduced. The formulation of radiant light transfer in a model leads to a system of complex integral equations, which currently have been solved by Monte Carlo Methods. One of the major problems in Monte Carlo sampling is to determine the location and density of sample points in order to reduce the variance of the estimates. Here a solution is provided by applying evolution strategies to calculate the global illumination. Thus exploiting the search space, i.e. the hemisphere of incident radiation to a point on a surface in a very efficient way through maintaining populations of rays and applying selfadaptive genetic recombination operators. The simulation process now becomes selforganizing and the transition of one state into another is no longer independent of previous states which allows the system to adjust optimally to a particular lighting situation. (IGD)

Show publication details

Hornung, Christoph; Jäger, Michael; Santos, Adelino; Tritsch, Bernhard

Cooperative HyperMedia - An Enabling Paradigm for Cooperative Work

1993

The Visual Computer

This paper describes the integration of computer supported cooperative work (CSCW), multimedia and hyperstructures into a single framework, called Cooperative HyperMedia (CHM). The concept of CHM supports groups of users acting on a single hypermedia document. Cooperative HyperMedia is a layered concept that integrates several notions related with the production of hypermedia documents, namely, document contents, access, and organization. To test the applicability of the concept of this approach to CSCW we have realized a generic CHM editing architecture (CoMEdiA), a telecommunication mechanism for multimedia objects (Tle Media), and a service for cooperative work over lang distances for time-dependent media (MISTER COOL). (IGD)

Show publication details

Tritsch, Bernhard; Hornung, Christoph; Encarnação, José L.

DEDICATED - Learning on Networked Multimedia Platforms

1993

Visualization in Scientific Computing: Uses in University Education. Proceedings

IFIP WG 3.2 Working Conference on Visualization in Scientific Computing: Uses in University Education <1993, Irvine, CA, USA>

The development of a distributed and heterogeneous generic multimedia learning environment presents many issues. The hardware, software and network platforms are heterogeneous, so device-independence and interoperability are vital. Therefore, the primary objective of the research presented here is to introduce and to specify a generic learning architecture, including communication mechanisms and multimedia features. This architecture provides application-independent functionality in the areas of transfer, processing, storage, presentation and interaction, and allows the development of distributed learning applications in a great variety of fields (such as Scientific Visualisation, CAD, Rendering). In addition, co-operation and timing control paradigms must be introduced to allow real-time communication and remote access; such features are termed Tele-Media (tele-communicating multimedia).

Show publication details

Hornung, Christoph; Santos, Adelino

Eurographics '93 Tutorial. Cooperative User-Interfaces and Networks for Collaboration

1993

Eurographics <14, 1993, Barcelona, Spain>

Eurographics Technical Report Series

We focus on understanding the workplace and technology currently appearing for CSCW and groupware development. The tutorial addresses the software implementation challenges that accompany groupware development. Our view is that many problems arise from our inadequate appreciation of the subtle dynamics that affect a group's activity and determine its response to technology. Social, political and motivational factors that are not very important in computer support of the "solo" aspects of an individual's work are major factors governing the success of groupware. Getting a better understanding of this mix of computer technology with group factors and giving a state-of-the-art survey constitute the main goal of this tutorial.

Show publication details

Bräckelmann, Monika; Hornung, Christoph

Konzeption eines objektorientierten Ray Tracers im Rahmen von PREMO

1993

Neue Architekturkonzepte zur Gestaltung graphischer Systeme. Proceedings

GI-Workshop Neue Architekturkonzepte zur Gestaltung graphischer Systeme <1993, Bonn>

In der objektorientierten Architektur des neuen Graphik- und Multimedia-Standards PREMO sind Foundation Objects und Komponenten-spezifische Objektklassen definiert. Diese Objekthierarchie wird einem Ansatz für eine dem PREMO-Standard genügende Ray-Tracing-Komponente zugrunde gelegt. Die Ziele, die durch Objektorientierung im Standard angestrebt werden, werden kurz für die Ray-Tracing-Komponente verifiziert.

Show publication details

Tritsch, Bernhard; Vieira, Ana Sofia; Hornung, Christoph

Video and Audio Communication over LAN

1993

Local Area Network Applications: Leveraging the LAN. Proceedings

IFIP TC8/WG 8.4 Working Conference on The Open Systems Future: Leveraging the LAN <1993, Perth, Western Australia>

The main goal of today`s computer communication is to be as close as possible to real human communication, where media such as voice, image and gesture should be accurately simulated by the available computer technology. People and computers are placed in a time and space continuum. Two or more people may coincide in one or other of these dimensions, in both, or in neither. During a "live conversation", time and place are the same for two or more communicating pratners. If one of the conversation partners stores and then forwards his message (as in Email), then for the other partners the time is later, place may be different and hence the live or real-time characteristics of the conversation are lost. The concept of peopleat distant locations communicating with each other both visually and verbally over a telephon line (otherwise known as videoconferencing) has become reality in meeting rooms and on desktops. Videoconferencing has been technically possible for years, but at such great costs that it was a practical alternative for only large organisations with specially designed facilities (Bellcore, NTT, Xerox).

Show publication details

Hornung, Christoph; Santos, Adelino

A Proposal for a Reference Model for Cooperative HyperMedia Systems

1992

Multimedia. Systems, Interaction and Applications

Eurographics Workshop on Multimedia (EGMM) <1, 1991, Stockholm, Sweden>

At the time being, there are many different systems claiming to be either multimedia, hypermedia, or supporting collborative/cooperative work. In the following paper, a first attempt to clearify the notions of these concepts is tried. Multimedia content, hyperstructure organization and cooperative access will be identified as different features of an intelligent document. These features will be discussed under formal, information technology and implementation aspects.

Show publication details

Ackermann, Hans-Josef; Hornung, Christoph

An Architecture for a High Performance Programmable Rendering Engine

1992

Eurographics Workshop on Graphics Hardware `91. Proceedings

Eurographics Workshop on Graphics Hardware <6, 1991, Vienna, Austria>

We present an architecture for a hogh-performance programmable rendering engine. This chip or chip-set will be able to deliver one Gouraud-shaded, z-buffered, texture-modulated and alphablended pixel every clock cycle. Focus of the paper is the derivation of the architecture of the pixel processing block from the applied algorithms. (IGD)

Show publication details

Hornung, Christoph; Santos, Adelino

CoMEdiA. A Cooperative HyperMedia Editing Architecture - The Problem of the Cooperative Access

1992

Multimedia. Systems, Interaction and Applications

Eurographics Workshop on Multimedia (EGMM) <1, 1991, Stockholm, Sweden>

We describe CoMEdiA, a Cooperative hyperMedia Editing Architecture. CoMEdiA is a software tool that has been conceived having as main guidlines: cooperative work, multimedia data, hyper features, distributed processing and information edition. Using CoMEdiA users compete for the access of an information server in order to manage the cooperative edition of multimedia data. A first prototype with some of the above features is already implemented and the implementation is described. We have partitioned this paper in the following manner. In the first section we will describe the problem that we are trying to solve. In the second we give an overview of CoMEdiA. In the third we describe the architecture and in the fourth we will present the algorithm that is used to solve the problems posed by the access. Finally we mention our intentions concerning future work and draw some conclusions.

Show publication details

Lange, Brigitta; Lobo Netto, Marcio; Hornung, Christoph

Eine verteilte Realisierung von DaRender

1992

Parallele Datenverarbeitung mit dem Transputer

Transputer-Anwender-Treffen <3, 1991, Aachen>

Im folgenden werden zwei unterschiedliche Strategien zur Parallelisierung von DaRender, einer am Graphikstandard PHIGS-PLUS orientierten Rendering Pipeline zur Erzeugung von dreidimensionalen, schattierten Szenen vorgestellt. Dabei wird die Realisierung der Verfahren auf einem Mehrprozessor-System unter besonderer Berücksichtigung des dafür entwickelten dynamischen Puffer-Mechanismus beschrieben sowie eine Bewertung verschiedener Verteilungsstrategien gegeben. (IGD)

Show publication details

Hornung, Christoph [Betreuer]

Proceedings of the 2nd Eurographics Workshop on Multimedia

1992

Eurographics Workshop on Multimedia (EGMM) <2, 1992, Darmstadt>

Eurographics Technical Report Series

Show publication details

Ackermann, Hans-Josef; Hornung, Christoph

The Triangle Shading Engine

1992

Advances in Computer Graphics Hardware V

Eurographics Workshop on Graphics Hardware <5, 1990, Lausanne, Switzerland>

This paper describes an algorithm implementing the Gouraud-shading of triangles and its realization in hardware. Different realizations using span-shading hardware are discussed. Their drawbacks then lead to the design of a triangle shader, designed as an ASIC. Interfaced to a signal processor for geometry computations, this chip will provide an effective and low-cost 3D-extensions to graphics subsystems in the PC environment.

Show publication details

Günther, Marion; Hornung, Christoph; Kuhlmann, Herbert W.; Encarnação, José L.; Knierriem, Anette

DEDICATED. Development of a new Dimension in European Computer-Aided Teaching and Education

1991

Training: From Computer Aided Design to Computer Integrated Enterprise. Proceedings of the IFIP WG 3.4 Working Conference

IFIP WG 3.4 Working Conference on Training: From CAD to CIE <1991, Alesund, Norway>

The development of a new dimension in European computer-aided teaching and education - DEDICATED - is an R&D proposal that aimes at the promotion of institutional cooperation on a European scale, in the areas of distributed, multilingual and multimedia education, continuing education, and industrial training. It is one of the project`s main goals to collaboratively develop training and software. DEDICATED should have as results: - profiles for the (hardware, software, and system) requirements of a European academic education and training scheme; - the implementation of a European academic educational scheme on both a local and a remite basis (telecommunication approach); - tools for the development of multilingual teachware; - tools for the support of multimedia approaches; - prototype education and training programs for computer science and engineering, demonstrated on courses given by the partner institutions; - prototype training programs for small- and medium-sized companies.

Show publication details

Hornung, Christoph; Encarnação, José L.

DEUKOM. Darmstädter Europa-orientiertes Programm für Kommunikationstechnik

1991

GI - 21. Jahrestagung. F&E Projekt-Berichte

GI - Jahrestagung <21, 1991, Darmstadt>

DEUKOM (Darmstädter Europa-orientiertes Programm für Kommunikationtechnik) ist eine F&E-Initiative zur Realisierung von multimedialen, kooperativen Anwendungen auf der Basis heterogener Netzwerke. Ziel von DEUKOM ist die Entwicklung einer Systemarchitektur, die Dienste in den Bereichen Transport, Speicherung, Präsentation und Interaktion zur Bearbeitung von Dokumenten mit Multimedia-Inhalt, Hyperstructure-Organisation und kooperativem Zugriff bereitstellen. Eine Testumgebung für diese Architektur wird derzeit bei der AGD unter dem Titel CoMEdiA (Cooperative HyperMedia Editing Architecture) entwickelt. (AGD)

Show publication details

Santos, Adelino; Hornung, Christoph

Some Issues on Cooperative Multimedia Editing

1991

4ø Encontro Português de Computação Gráfica. Conferencias e Comunicacoes

Encontro Português de Computação Gráfica (EPCG) <4, 1991, Lisboa, Portugal>

Die Wahrnehmung von Bewegung nimmt im visuellen System eine besondere Stellung ein. So ist das Auflösungsvermögen des Auges für langsam bewegte Objekte höher als für ruhende. Diese Bevorzugung sichert dem Menschen das Überleben, denn Veränderungen der Außenwelt sind oft mit Gefahren verbunden, man denke nur an den Straßenverkehr. Für die Graphische Datenverarbeitung bedeutet das: Bewegung eines Objektes auf dem Bildschirm erhöht die räumliche Wahrnehmung und den realistischen Eindruck. Die Bewegtbilderzeugung in der Computeranimation und-simulation dient dabei der Erkenntnisgewinnung, der Vermittlung von Wissen und dem Training. (AGD)

Show publication details

Hornung, Christoph

DEDICATED - Computer Graphics für den Unterricht

1990

Computer Graphik Topics

DEDICATED (DEvelopment of a new DImension in Computer Aided Teaching and EDucation) ist eine Initiative, die im Frühjahr 1989 von Herrn Prof. Encarnacao gestartet wurde. Ziel ist die Installation einer europaweiten, multilingualen, virtuellen Lernumgebung. Zur Vorbereitung wurden in den beiden letzten Jahren mehrere internationale Workshops veranstaltet und die Ergebnisse der europäischen Gemeinschaft in Brüssel präsentiert. (AGD)

Show publication details

Hornung, Christoph; Pöpsel, J.

Highlight Shading

1989

Eurographics '89. Proceedings

Eurographics <10, 1989, Hamburg, Germany>

Todays graphics standard for the rendering of scenes with illumination and reflection is defined by PHIGS+. PEX is a proposal to integrate that functionality into the window environment of X. This paper first describes the lighting and shading models of PHIGS+/PEX. Then a comparison of the different shading methods follows. At last, a new shading method, the Highlight Shading, is developed. The Highlight Shading combines both speed and image quality and therefore is an attractive alternative to existing shading algorithms.(AGD)

Show publication details

Koegel, Ulrich; Hornung, Christoph [Betreuer]; Klos, Walter [Betreuer]

Entwurf und Implementierung eines allgemeinen Visibilitaetskonzepts mit allgemeiner Eingabestruktur und allgemeinen Visibilitaetsstrategien

1979

Darmstadt, TH, Diplomarbeit, 1979