Rogier Brussee

• Dr
• Senior Researcher at Eindhoven University of Technology

Fuzzy logic is a way to argue with boolean predicates for which we only have a confidence value between 0 and 1 rather than a well defined truth value. It is tempting to interpret such a confidence as a probability. We use Markov kernels, parametrised probability distributions, to do just that. As a consequence we get general fuzzy logic connective...

Most molecule-oriented databases allow many different queries. E.g., for the leading biomolecular database PubChem, molecules can be queried on the molecule name, its identifier code (e.g., ICSC number), the molecular formula, one of (possibly non unique) SMILES strings of the molecule, as well as “metadata” such as the studies where information ca...

We define entropy measures for the spectrum for a time series measuring how it differs from an expected power spectrum. We give two examples coloured noise (white noise with a frequency cut off) and pinky noise (pink noise with a frequency cut off).

We give a refinement of the well known business model canvas by Osterwalder and Pigneur by splitting the basic blocks into further subblocks to reduce confusion and increase its expressive power. The splitting is used in an online tool which in addition comes with a set of question to further structure the business modelling process and help doing...

Wanneer zijn social media effectief, wat bepaalt die effectiviteit en hoe kunnen we die meten? Het zijn deze vragen waarop het project The Network = the Message zich richt. In de eerste fase van dit tweejarige onderzoekstraject is in kaart gebracht hoe social media campagnes nu worden ingezet en op welke wijze online netwerken worden geactiveerd. I...

By mapping social media networks around the theme channel NPO Spirit, we offer insights to bring the wide array spiritual television programs to as many people and different groups as possible through social media. [publication in Dutch]

In the research project "Museum Compass" we have developed a prototype of a social media monitor, which contains data of current and historic online activities on Facebook, Twitter, YouTube, Foursquare and Flickr of all registered Dutch museums. We discuss – mostly in a practical sense – our approach for developing the monitor and give a few exampl...

The term crowdsourcing was introduced by Jeff Howe (2006). It is the act of a company or organisation to take a function once performed by employees and outsourcing it to an undefined, and usually large, network of people in the form of an open call. As communication tools to organize work have become widely available, and a well-educated global wo...

Crowdfunding is gaining popularity as a viable means to raise financial capital for good causes, cultural goods, new products, and ventures. Little empirical research has been done to understand crowdfunding and basic academic knowledge of its dynamics is still lacking. By data mining the crowdfunding platform Kickstarter.com and Facebook we collec...

Maandenlang zijn een kleine miljoen deelnemers ruim 230 miljoen cubelets per dag aan het weghakken geweest in een race naar het midden van een digitale kubus in het spel Curiosity. Wat is hier aan de hand? Deze publicatie van het Centre of Expertise Creatieve Industrie maakt de lezer wegwijs in het fenomeen van crowdsourcing. Aan de hand van vele v...

Waarom gaan mensen naar festivals? Hoe beleven ze een festival? Waarom komen ze wel of niet terug? Hoe kunnen festivalorganisatoren de motivatie en beleving van bezoekers effectief beïnvloeden? Wat betekenen sociale media voor de festivalbeleving? Antwoorden op deze vragen helpen festivalorganisatoren een uniek festival aan te bieden en effectiever...

We analyze numerically and theoretically steady states and bifurcations in a model for ship maneuvering provided by MARIN, and in a simplified model that combines rudder and propeller into an abstract 'thruster'. Steady states in the model correspond to circular motion of the ship and we compute the corresponding radii. We non-dimensionalize the mo...

We present two algorithms for indoor positioning in peer-to-peer networks. The setup is a network of two types of devices: reference devices with a known location, and user devices that can determine distances to reference devices and each other. We present two algorithms for positioning estimation in such a peer-to-peer network. The first one is p...

A common strategy to assign keywords to documents is to select the most appropriate words from the document text. One of the most important criteria for a word to be selected as keyword is its relevance for the text. The tf.idf score of a term is a widely used relevance measure. While easy to compute and giving quite satisfactory results, this meas...

In many cases keywords from a restricted set of possible keywords have to be assigned to texts. A common way to find the best keywords is to rank terms occurring in the text according to their tf.idf value. This requires a corpus of texts from which document frequencies can be derived. In this paper we show that we can obtain results of the same qu...

We present two algorithms for indoor positioning estimation in peer-to-peer net-works. The setup is a network of two types of devices: reference devices with a known location and blindfolded devices that can determine distances to reference devices and each other. From this information the blindfolded devices try to estimate their po-sitions. A typ...

This is a report not a dataset.

Tagging with free form tags is becoming an increasingly important indexing mechanism. However, free form tags have characteristics that require special treatment when used for searching or recommendation because they show much more variation than controlled keywords. In this paper we present a method that puts this large variation to good use. We i...

We argue that social media can best be understood as a media supply chain in which large groups of consumers participate in the role of producers. Such a media supply chain must be highly accessible at each stage of the media supply process. We will analyze the barriers posed by different stages of the media supply chain and use this analysis to di...

The emergence of web based systems in which users can annotate items, raises the question of the semantic interoperability between vocabularies originating from collaborative annotation processes, often called folksonomies, and keywords assigned in a more traditional way. If collections are annotated according to two systems, e.g. with tags and ke...

We consider topic detection without any prior knowledgeof category structure or possible categories. Keywords are extracted and clustered based on different similarity measures using the induced k-bisecting clustering algorithm. Evaluation on Wikipedia articles shows that clusters of keywords correlate strongly with the Wikipedia categories of the...

This paper proposes a characterization of useful thesaurus terms by the informativity of co- occurence with that term. Given a corpus of documents, informativity is formalized as the information gain of the weighted average term distribution of all documents containing that term. While the resulting algorithm for thesaurus generation is unsupervise...

In this paper we give an overview of methods to find representations of ontology defined concepts in texts. We distinguish two approaches: lexicon-based methods and approaches using lexicalized ontologies. We focus on the latter method and describe the problems and choices that have to be made if this approach is put to work. Finally we describe an...

The term meta origins from the Greek word µ∈τα, meaning after. The word Metaphysics is the title of Aristotle’s book coming after his book on nature called Physics. This has given meta the modern connotation of a nature of a higher order or of a more fundamental kind [1]. Literally, metadata is “data about data”. It can be any descriptive informati...

We describe reasoning as the process needed for using logic. Efficiently performing this process is a prerequisite for using logic to present information in a declarative way and to construct models of reality. In particular we describe description logic and the owl ontology language and explain that in this case reasoning amounts to graph completi...

We describe reasoning as the process needed for using logic. Efficiently performing this process is a prerequisite for using logic to present information in a declarative way and to construct models of reality. In particular we describe description logic and the owl ontology language and explain that in this case reasoning amounts to graph completi...

We use Donaldson invariants of regular surfaces with p_g >0 to make quantitative statements about modulispaces of stable rank 2 sheaves. We give two examples: a quantitative existence theorem for stable bundles, and a computation of the rank of the canonical holomorphic two forms on the moduli space. The results are in some sense dual to the Donald...

Adaptive systems can be used to help people find their way through large amounts of information by taking into account the content itself and opinions of other people. Annotations that describe content are important in this process as is generally recognized. What is less obviously stated so far is that not only the annotations themselves, but also...

The Integrated Health Log demonstrator shows how multimedia can be used in collaborative settings in healthcare. Patient data can be shared annotated discussed and processed by medics involved with a patient. Special emphasis is put on protecting the privacy of patients and allowing medics to keep responsibility for their patient data. In particula...

The goal of the CHIP (Cultural Heritage Information Personalization) project is to provide personalized access to combined cultural heritage content. The driving case is given by the Rijksmuseum content presented on the museum web site and visitor guides. The CHIP project aims to extend and integrate existing technologies for semantic browsing and...

This paper proposes a simple, single extension of OWL, namely maximalSubPropertyOf that allows to "localize" a given property to a fixed domain and range. As an application we show that both qualified cardinality re-striction and reflexive properties can be defined using this construction in con-junction with existing OWL functionality.

The goal of the CHIP (Cultural Heritage Information Personalization) project is to provide personalized access to combined cultural heritage content. The driving case is given by the Rijksmuseum content presented on the museum Web site and visitor guides. The CHIP project aims to extend and integrate existing technologies for semantic browsing and...

Scanning the internal and external environment of an organisation to trace cur-rent and emerging topics of discourse, is an important task for knowledge management. Results of this scanning process can be used to anticipate on new developments and for de-tecting possible knowledge bottlenecks. This paper addresses the unobtrusive identification of...

Companies can form alliances on the Internet to aggregate buying or selling power and create value. More concretely, together resources are shared or new possibilities are exploited that cannot be exploited individually. Most alliances are formed as a result of a negotiation process between the companies that form an alliance. This paper proposes a...

In this paper we investigate how conceptualisations can be identified in weblogs using language technology (automated text analysis). We focus on getting a handle on both the concepts bloggers use and the way they think these concepts are related. The analysis of these conceptualisations can then be applied to a single weblog, resulting in a visual...

In this paper we argue that the effort within the context of Semantic Web research, such as RDF and DAML-S. will allow for better knowledge representation and engineering of educational systems and easier integration of e-learning with other business processes. We also argue that existing educational standards, such as SCORM and LOM could be mapped...

Generating hypermedia presentations requires processing constituent material into coherent, unified presentations. One large challenge is creating a generic process for producing hypermedia presentations from the semantics of potentially unfamiliar domains. The resulting presentations must both respect the underlying semantics and appear as coheren...

. We give a self contained proof that for Kahler surfaces with nonnegative Kodaira dimension, the canonical class of the minimal model and the (Gamma1)-curves are oriented diffeomorphism invariants up to sign. This includes the case pg = 0. It implies that the Kodaira dimension is determined by the underlying differentiable manifold. We then reprov...

We give a self contained proof that for Kahler surfaces with non- negative Kodaira dimension, the canonical class of the minimal model and the ( 1)-curves are oriented dieomorphism invariants up to sign. This includes the case pg = 0. It implies that the Kodaira dimension is determined by the underlying dierentiable manifold. We then reprove that t...

We give a self contained proof using Seiberg Witten invariants that for K\"ahler surfaces with non negative Kodaira dimension (including those with $p_g = 0$) the canonical class of the minimal model and the $(-1)$-curves, are oriented diffeomorphism invariants up to sign. This implies that the Kodaira dimension is determined by the underlying diff...

Let $X$ be a simply connected 4-manifold containing a $(-1)$-sphere $e$. Fintushel and Stern prove that $$ D_c(\exp(te)) = D_c(B(t)) on e^\perp if c\cdot e is even, $$ $$ D_c(\exp(te)) = D_{c-e}(S(t)) on e^\perp if c \cdot e is odd, $$ for some universal series $B(t),S(t) \in \Q[x][[t]]$ with $x$ the class of a point. We show that their method can...

Define the Donaldson series of a simply connected 4-manifold by q(X) = \sum_d q_d(X)/d! Recently Kronheimer and Mroka have announced the result that the Donaldson series of so called simple 4-manifolds can be written as q(X) = e^{Q/2}\sum_{i=1}^p a_i e^{K_i} where $Q$ is the intersection form and the $K_i \in H^2(X,\Z)$ are the {\it Kronheimer-Mrow...

We will prove that every differentiably embedded sphere with self-intersection −1 in a simply connected algebraic surface withp g >0 is homologous to an algebraic class. If the surface has a minimal model with Picard number 1 or |K min| contains a smooth curve, and eitherp g orK min2 is even, then every such sphere is homologous to a (−1)-curve, as...

Without Abstract

Without Abstract

We use produced representations of super Lie algebras to construct superfields. We compare the representation of the super Poincare Algebra on these fields with the physics literature. The geometry of superspace is defined in terms of superfields without the use of Grassmann numbers or a particular model of super geometry. http://archive.numdam.or...

The Integrated HealthLog framework and the Physiolog en Sportlog pilot applications demonstrate how multimedia can be used in collaborative settings in healthcare. Patient data can be shared, annotated, discussed and processed by medics involved with a patient. The system is currently piloted in a gait analysis laboratory and in a network of physio...

This work describes a virtual organisation in healthcare, emphasising collaboration around a common task (organisational aspect), a virtual administrative domain spanning several information systems using communication technology (technological aspect), and the way this requires or causes changes in people's behaviour (social aspect). We give an in...

Tagging with free form tags is becoming an increasingly important indexing mechanism. However, tags have characteristics that require special treatment when used for searching or recommendation because they show much more variation than controlled keywords. In this paper we present a method that puts this large variation to good use. We introduce s...

This paper describes how the combination of recommendation and Semantic Web techniques can enhance user interaction with digital cultural heritage collections. The interface that this paper describes adapts user interaction to individual interest in both artworks and abstract concepts related to them. This paper presents an overview of several stu...

A growing number of organizations stores information on their customers. Both organizations and customers could benefit from exchanging these data more easily and safely. In the present pa-per we show how Liberty ID–WSF can be used to exchange personal details between organizations in a trustworthy manner that respects privacy and allows the use of...