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Wulf V.,Fraunhofer Institute for Applied Information Technology | Rohde M.,University of Siegen | Pipek V.,University of Siegen | Stevens G.,University of Siegen
Proceedings of the ACM Conference on Computer Supported Cooperative Work, CSCW | Year: 2011

Information and communications technology (ICT) pervades most aspects of our lives and changes everyday's practices in work and leisure time. When designing innovative ICTs, we need to engage with given practices, institutional arrangements, and technological infrastructures. We describe the research framework used at the University of Siegen. It is based on a collection of design case studies in particular fields of practice and identifies cross-cutting issues to compare and aggregate insights between these cases. To illustrate this framework, we describe our research activities and discuss three themes which became important in different design case studies. Copyright 2011 ACM.


Mohamad Y.,Fraunhofer Institute for Applied Information Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

This STS on Emotions for Accessibility is targeted towards the description of affective computing approaches e.g. emotional state detection, emotional state elicitation and their potential usage in the context of users who are disabled or older people. These user groups may gain a lot of benefits from affective computing systems e.g. in support of communication especially none verbal, management of emotional states or stress, or just improving therapy procedures etc. © Springer International Publishing 2014.


Pieper M.,Fraunhofer Institute for Applied Information Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

The German BIENE award (Barrierefreies Internet Eröffnet Neue Einsichten / Accessible Internet Provides New Insights) happened to be a best practice competition for accessible websites organized by the social association "Aktion Mensch" and the endowment "Digitale Chancen". For the last 2010 competition 224 web pages have been checked for their barrier free accessibility. Web applications that facilitate interactive sharing of user generated content have beenof particular importance. In this respect it soon turned out, that Web 2.0 services cannot only be made accessible by applying common design guidelines and ad-hoc adaptations. In addition to conventional software ergonomic verification procedures, accessibility validation has to rely on sociological reasoning about unique Web 2.0 entities and corresponding usage obstacles. Empirically these considerations have been conceptualized by an online survey amongst 671 respondents with all kinds of different disabilities, carried out by "Aktion Mensch". © 2014 Springer International Publishing.


Hackenberg G.,Fraunhofer Institute for Applied Information Technology | McCall R.,Fraunhofer Institute for Applied Information Technology | Broll W.,Fraunhofer Institute for Applied Information Technology
Proceedings - IEEE Virtual Reality | Year: 2011

We present a novel technique implementing barehanded interaction with virtual 3D content by employing a time-of-flight camera. The system improves on existing 3D multi-touch systems by working regardless of lighting conditions and supplying a working volume large enough for multiple users. Previous systems were limited either by environmental requirements, working volume, or computational resources necessary for realtime operation. By employing a time-of-flight camera, the system is capable of reliably recognizing gestures at the finger level in real-time at more than 50 fps with commodity computer hardware using our newly developed precision hand and finger-tracking algorithm. Building on this algorithm, the system performs gesture recognition with simple constraint modeling over statistical aggregations of the hand appearances in a working volume of more than 8 cubic meters. Two iterations of user tests were performed on a prototype system, demonstrating the feasibility and usability of the approach as well as providing first insights regarding the acceptance of true barehanded touch-based 3D interaction. © 2011 IEEE.


Vinkovits M.,Fraunhofer Institute for Applied Information Technology
2012 10th Annual International Conference on Privacy, Security and Trust, PST 2012 | Year: 2012

Research in the field of Trust Management is blooming producing new Trust Frameworks within short time intervals. However, trust researchers do not develop distributed systems. Most developers are not familiar with security procedures and therefore often introduce other security vulnerabilities during implementation. We wish to provide a solution for system designers and developers for applying Trust Management. As a first step of our work we investigated how our users understand the application of trust and reputation in distributed systems. During focus group workshops we collected a set of initial requirements. We learnt that users are familiar with the benefits gained by Trust Management but had not enough knowledge about its application. © 2012 IEEE.


Vinkovits M.,Fraunhofer Institute for Applied Information Technology | Zimmermann A.,Fraunhofer Institute for Applied Information Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

Trust Management researchers have created several sound frameworks for well-defined problems based on their deep understanding of the field and the current state of the art. However, Trust Management experts are rarely contacted for the design of distributed business applications. Developers of these kinds of business applications are not familiar with latest results and are only aware of a very limited set of applicable solutions. This hinders the adaption of these novel security solutions into provided future services. To support the integration of Trust Management into these areas we defined a design process, which can be applied systematically by developers. Based on the design process they can use their scenario knowledge to narrow down their design space and finally select from a limited set of applicable implementations the best fit. We extended the static TrustFraMM meta-description of Trust Management in a way to enable it to support the exploration and exclusion of existing trust functionality implementations. We built our process on a number of requirements collected through our user-centered design approach. We also provide a possible visualization of the process which we evaluated using a paper prototype. Our process had a positive user acceptance among the questioned users. © 2013 Springer-Verlag.


Prause C.R.,Fraunhofer Institute for Applied Information Technology
SIGSOFT/FSE 2011 - Proceedings of the 19th ACM SIGSOFT Symposium on Foundations of Software Engineering | Year: 2011

This paper proposes a PhD research that deals with improving internal documentation in software projects. Software developers often do not like to create documentation because it has few value to the individual himself. Yet the purpose of internal documentation is to help others understand the software and the problem it addresses. Documentation increases development speed, reduces software maintenance costs, helps to keep development on track, and mitigates the negative effects of distance in distributed settings. This research aims to increase the individuals'motivation to write documentation by means of reputation. The CollabReview prototype is a web-based reputation system that analyzes artifacts of internal documentation to derive personal reputation scores. Developers making many good contributions will achieve higher reputation scores. These scores can then be employed to softly influence developer behavior, e.g. by incentivizing them to contribute to documentation with social rewards. No strict rule enforcement is necessary. © 2011 ACM.


Niemann K.,Fraunhofer Institute for Applied Information Technology
ACM International Conference Proceeding Series | Year: 2015

Data sets coming from the educational domain often suffer from sparsity. Hence, they might comprise potentially use-ful learning objects that are not findable by the users. In order to address this problem, we present a new way to auto-matically assign tags and classifications to learning objects offered by educational web portals that is solely based on the objects' usage. © Copyright 2015 ACM.


Vinkovits M.,Fraunhofer Institute for Applied Information Technology | Zimmermann A.,Fraunhofer Institute for Applied Information Technology
Proceedings - 2012 ASE/IEEE International Conference on Privacy, Security, Risk and Trust and 2012 ASE/IEEE International Conference on Social Computing, SocialCom/PASSAT 2012 | Year: 2012

Due to the boom in trust research new Trust Frameworks are created within short time intervals providing specific solutions for different domains. But these frameworks miss a common understanding and shared description. Based on available categorizations and surveys we collected key components already identified within Trust Management and created a generally applicable meta-model, which aims at creating the common ground for future trust research in computer science. This model consists of well-defined elements, procedures and relations. By applying our model to existing frameworks we show that it is sound. This process also led to the identification of common implementations of our meta-model elements and to the definition of their interfaces. These elements will be able to support future research and system design. © 2012 IEEE.


Niemann K.,Fraunhofer Institute for Applied Information Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

Data sets coming from the educational domain often suffer from sparsity. Hence, many learning objects are not accessible by the users as they are not able to find these objects using for example a textbased search. Furthermore, the lack of information makes it difficult or even impossible to recommend such hidden learning resources. In order to address the data sparsity problem, this paper presents a new way to enhance the objects’ semantic representations. This is done by automatically assigning tags and classifications to learning objects offered by educational web portals. This way, we aim to increase the accessibility of the learning objects as well as to enable their recommendation. In contrast to popular tagging approaches that usually base the tagging of a learning object on its content or on the tags already assigned to it, the approach proposed in this paper is solely based on the objects’ usage. Therefore, tags and classifications can be exchanged between the objects and also previously un-tagged objects that do not hold any textual content can be automatically assigned with tags and classifications. © Springer International Publishing Switzerland 2015.

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