Inst. Wirtschaftsinformatik und Quantitative Methoden

67 Items

Recent Submissions
Enhanced Rate Control for Wireless Reliable Multicast (EWRiM)

Geithner, Thomas (2019-06-19)

While the concept of multicast communication offers a scalable and efficient method for many classes of applications in general, its potential remains largely unexploited when it comes to 802.11 networks. The fundamental lacking feature for this is a transmission rate control mechanism that offers higher transmission performance and lower channel utilization. Another challenging aspect is ensur...

A Response to the United Nations CITES Blockchain Challenge: Incremental and Integrative PoA-based Permit Exchange

Busse, Anselm ; Eberhardt, Jacob ; Frost, Sebastian ; Kim, Dong-Ha ; Weilbier, Thore ; Renner, Lukas ; Roth, Matthias ; Tai, Stefan (2019-07-01)

The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) negotiated and administered by the United Nations Environment Programme (UNEP) regulates the international trade of endangered species and derived products through a permit-based system. Currently, the permit process is paper-based and hence highly prone to manipulations and errors. Being aware of blockc...

Towards adaptive multi-robot systems: self-organization and self-adaptation

Hrabia, Christopher-Eyk ; Lützenberger, Marco ; Albayrak, Sahin (2018-10-04)

The development of complex systems ensembles that operate in uncertain environments is a major challenge. The reason for this is that system designers are not able to fully specify the system during specification and development and before it is being deployed. Natural swarm systems enjoy similar characteristics, yet, being self-adaptive and being able to self-organize, these systems show benef...

Modelling and integrating personality as affective phenomenon in agent-based systems

Ahrndt, Sebastian (2019)

A team member's ability to predict the actions of other team members influences the efficiency of teamwork. This is named predictability and one of the challenges associated with the task of making agents team player in joint human-agent activities. I approach this problem focusing on personality as a predictor of human behaviour and following a combination of theory and data-driven approaches...

A Response to the United Nations CITES Blockchain Challenge: Incremental and Integrative PoA-based Permit Exchange - Demo Video

Busse, Anselm ; Eberhardt, Jacob ; Frost, Sebastian ; Kim, Dong-Ha ; Weilbier, Thore ; Renner, Lukas ; Roth, Matthias ; Tai, Stefan (2019)

This video is referenced by the paper "A Response to the United Nations CITES Blockchain Challenge: Incremental and Integrative PoA-based Permit Exchange". See the abstract of the paper below: The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) negotiated and administered by the United Nations Environment Programme (UNEP) regulates the international tr...

EffFeu Project: Towards Mission-Guided Application of Drones in Safety and Security Environments

Hrabia, Christopher-Eyk ; Hessler, Axel ; Xu, Yuan ; Seibert, Jacob ; Brehmer, Jan ; Albayrak, Sahin (2019-02-25)

The number of unmanned aerial system (UAS) applications for supporting rescue forces is growing in recent years. Nevertheless, the analysis of sensed information and control of unmanned aerial vehicle (UAV) creates an enormous psychological and emotional load for the involved humans especially in critical and hectic situations. The introduced research project EffFeu (Efficient Operation of Unma...

Application-level Simulation for Network Security

Schmidt, Stephan ; Bye, Rainer ; Chinnow, Joël ; Bsufka, Karsten ; Camtepe, Ahmet ; Albayrak, Sahin (2010)

NeSSi (network security simulator) is a novel network simulation tool which incorporates a variety of features relevant to network security distinguishing it from general-purpose network simulators. Its capabilities such as profile-based automated attack generation, traffic analysis and support for detection algorithm plug-ins allow it to be used for security research and evaluation purposes. N...

Distributed enterprise search using software agents

Gunadi, Erwin ; Meder, Michael ; Plumbaum, Till ; Scheel, Christian ; Hopfgartner, Frank ; Albayrak, Sahin (2014)

In this paper we introduce a distributed information retrieval system using agent-based technology. In this multi-agent system, each agent has its own specific task and can be used to handle a specific document repository. The system is designed to automatically comply with access restriction rules that are normally enforced in companies. It is used in the administration offices of the German c...

Report on the SIGIR 2013 workshop on benchmarking adaptive retrieval and recommender systems

Castells, Pablo ; Hopfgartner, Frank ; Said, Alan ; Lalmas, Mounia (2013)

In recent years, immense progress has been made in the development of recommendation, retrieval, and personalisation techniques. The evaluation of these systems is still based on traditional information retrieval and statistics metrics, e.g., precision, recall and/or RMSE, often not taking the use-case and situation of the actual system into consideration. However, the rapid evolution of recomm...

A Visualization Tool for Violent Scenes Detection

Maniry, Dominique ; Acar, Esra ; Hopfgartner, Frank ; Albayrak, Sahin (2014)

We present a browser-based visualization tool that allows users to explore movies and online videos based on the violence level of these videos. The system offers visualizations of annotations and results of the MediaEval 2012 Affect Task and can interactively download and analyze content from video hosting sites like YouTube.

Users' reading habits in online news portals

Esiyok, Cagdas ; Kille, Benjamin ; Jain, Brijnesh-Johannes ; Hopfgartner, Frank ; Albayrak, Sahin (2014)

The aim of this study is to survey reading habits of users of an online news portal. The assumption motivating this study is that insight into the reading habits of users can be helpful to design better news recommendation systems. We estimated the transition probabilities that users who read an article of one news category will move to read an article of another (not necessarily distinct) news...

Shedding light on a living lab: the CLEF NEWSREEL open recommendation platform

Brodt, Torben ; Hopfgartner, Frank (2014)

In the CLEF NEWSREEL lab, participants are invited to evaluate news recommendation techniques in real-time by providing news recommendations to actual users that visit commercial news portals to satisfy their information needs. A central role within this lab is the communication between participants and the users. This is enabled by The Open Recommendation Platform (ORP), a web-based platform w...

The Video Browser Showdown: a live evaluation of interactive video search tools

Schöffmann, Klaus ; Ahlström, David ; Bailer, Werner ; Cobârzan, Claudiu ; Hopfgartner, Frank ; McGuinness, Kevin ; Gurrin, Cathal ; Frisson, Christian ; Le, Duy-Dinh ; Del Fabro, Manfred ; Bai, Hongliang ; Weiss, Wolfgang (2014)

The Video Browser Showdown evaluates the performance of exploratory video search tools on a common data set in a common environment and in presence of the audience. The main goal of this competition is to enable researchers in the field of interactive video search to directly compare their tools at work. In this paper, we present results from the second Video Browser Showdown (VBS2013) and desc...

Semantic decomposition and marker passing in an artificial representation of meaning

Fähndrich, Johannes (2018)

The research area of Distributed Artificial Intelligence aims at building intelligent agent systems. Multi-Agent Systems have been applied successfully in many domains, from an intermodal planning domain to cascading security thread simulations. But still, agents struggle with the meaning of concepts used in language. Intelligence needs language to form thoughts. Thus, the challenge addressed i...

Overview of CLEF NEWSREEL 2014: news recommendation evaluation labs

Kille, Benjamin ; Brodt, Torben ; Heintz, Tobias ; Hopfgartner, Frank ; Lommatzsch, Andreas ; Seiler, Jonas (2014)

This paper summarises objectives, organisation, and results of the first news recommendation evaluation lab (NEWSREEL 2014). NEWSREEL targeted the evaluation of news recommendation algorithms in the form of a campaignstyle evaluation lab. Participants had the chance to apply two types of evaluation schemes. On the one hand, participants could apply their algorithms onto a data set. We refer to ...

User-item reciprocity in recommender systems: incentivizing the crowd

Said, Alan ; Larson, Martha ; Tikk, Domonkos ; Cremonesi, Paolo ; Karatzoglou, Alexandros ; Hopfgartner, Frank ; Turrin, Roberto ; Geurts, Joost (2014)

Data consumption has changed significantly in the last 10 years. The digital revolution and the Internet has brought an abundance of information to users. Recommender systems are a popular means of finding content that is both relevant and personalized. However, today's users require better recommender systems, able of producing continuous data feeds keeping up with their instantaneous and mobi...

Providing multilingual access to health-related content

Plumbaum, Till ; Narr, Sascha ; Eryilmaz, Elif ; Hopfgartner, Frank ; Klein-Ellinghaus, Funda ; Reese, Anna ; Albayrak, Sahin (2014)

Finding health-related content is not an easy task. People have to know what to search for, which medical terms to use, and where to find accurate information. This task becomes even harder when people such as immigrants wish to find information in their country of residence and do not speak the national language very well. In this paper, we present a new health information system that allows u...

When to recommend What? A study on the role of contextual factors in IP-based TV services

Yuan, Jing ; Sivrikaya, Fikret ; Marx, Stefan ; Hopfgartner, Frank (2014)

Today’s IP-based TV services commonly strive for personalizing their content offers using complex recommendation systems to match their users’ interests. These systems try to capture the relevance of content recommended to a user, which may also depend on many contextual factors such as time, location, or social company. Nevertheless, in most cases, these factors are either omitted or integrate...

An intelligent health assistant for migrants

Plumbaum, Till ; Narr, Sascha ; Schwartze, Veit ; Hopfgartner, Frank ; Albayrak, Sahin (2013)

Preventive health is becoming an increasingly important part of our society. In addition to improving people’s personal well being, another positive effect is the reduction of costs for medical treatments that put a high burden on individuals and health care providers. Despite these advantages, preventive health services are still not used at a desired level. This is especially true for people ...

Workshop on benchmarking adaptive retrieval and recommender systems - BARS 2013

Castells, Pablo ; Hopfgartner, Frank ; Said, Alan ; Lalmas, Mounia (2013)

Evaluating adaptive and personalized information retrieval techniques is known to be a difficult endeavor. The rapid evolution of novel technologies in this scope raises additional challenges that further stress the need for new evaluation approaches and methodologies. The BARS 2013 workshop seeks to provide a specific venue for work on novel, personalization-centric benchmarking approaches to ...