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See detailGeoGebra 3.2 – The new Spreadsheet View
Kreis, Yves UL; Hohenwarter, Markus; Hohenwarter, Judith

Scientific Conference (2009, July 12)

GeoGebra (www.geogebra.org) is a free, multi-platform, open-source dynamic mathematics software with rapidly growing worldwide popularity. The basic idea of the software is to join dynamic geometry ... [more ▼]

GeoGebra (www.geogebra.org) is a free, multi-platform, open-source dynamic mathematics software with rapidly growing worldwide popularity. The basic idea of the software is to join dynamic geometry, algebra, and calculus, which other packages treat separately, into a single easy-to-use package for learning and teaching mathematics from elementary through university level. So far GeoGebra’s user interface allowed algebraic (i.e. coordinates of points, equations) and graphical (i.e. points, function graphs) representations of mathematical objects. While coordinates and equations were displayed in the algebra view on the left hand side, their graphical representations could be seen in the graphics view on the right hand side. The release version 3.2 (available in April 2009) adds another – third – view: the spreadsheet view. Now various kinds of mathematical objects – not only numbers – can also be put inside spreadsheet cells. All representations of the same object are linked dynamically and adapt automatically to changes made to any of the representations, no matter how they were initially created. This enables users to connect statistical reasoning with other areas of mathematics. In this presentation we will introduce the new view, present some examples and discuss the opportunities it offers for the teaching and learning of mathematics. [less ▲]

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See detailGeoGebraPrim - GeoGebra for Primary School
Kreis, Yves UL; Dording, Carole

Scientific Conference (2009, July 11)

The aims of the project are on one hand the improvement of the children’s understanding of the elementary geometric concepts and on the other side a deeper insight in the bond of geometry and algebra. The ... [more ▼]

The aims of the project are on one hand the improvement of the children’s understanding of the elementary geometric concepts and on the other side a deeper insight in the bond of geometry and algebra. The study consists in a pre-/post-test scenario combined with observations of particularly interesting situations. All in all approximately 200 children of 9 years will participate; about half of them will follow a traditional paper/pencil geometry course while the others will be mixing experiences on the computer to the traditional ones. So far the existing Dynamic Geometry System GeoGebra has been adapted to the needs of the primary school through multiple observations of children working with the software. Besides it has been integrated into the TAO (Testing Assisté par Ordinateur – Computer-Assisted Testing) platform that will be used partially for the final test. In this presentation we will give a short overview of the project, explain the educational and technological concepts used and present first results of the study. [less ▲]

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See detailLaurent Menager. Une vie pour la musique chorale
Sagrillo, Damien UL

Conference given outside the academic context (2009)

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See detailSymmetrien in der Natur. Was sagt uns die Mathematik hierzu
Schlichenmaier, Martin UL

Conference given outside the academic context (2009)

Objekte in der Natur haben meist Formen und Strukturen, die sich durch gewisse Regelmäßigkeiten auszeichnen. Dafür verwendet man oft den vagen Begriff der Symmetrie. Symmetrische Formen werden meist als ... [more ▼]

Objekte in der Natur haben meist Formen und Strukturen, die sich durch gewisse Regelmäßigkeiten auszeichnen. Dafür verwendet man oft den vagen Begriff der Symmetrie. Symmetrische Formen werden meist als schön empfunden. Im Vortrag möchte ich erläutern, wie man den Begriff der Symmetrie mathematisch exakt erfassen kann. An Beispielen möchte ich zeigen, dass bereits einige einfache Annahmen gewisse Formen erzwingen. Aber nicht nur bei der Herausbildung von Formen spielt die Symmetrie eine Rolle. Sie ist ebenfalls ein wichtige Erkenntnismethode in der modernen Theoretischen Physik. [less ▲]

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See detailInternational GeoGebra Institute: nurturing a community to assist the integration of the open-source mathematics software GeoGebra into mathematics teaching
Kreis, Yves UL; Lavicza, Zsolt

Scientific Conference (2009, July 06)

GeoGebra is a free open-source dynamic mathematics software that is a versatile tool for visualizing mathematical concepts from elementary through university level. Without any promotion and organised ... [more ▼]

GeoGebra is a free open-source dynamic mathematics software that is a versatile tool for visualizing mathematical concepts from elementary through university level. Without any promotion and organised training GeoGebra has been discovered and used by tens of thousands of enthusiastic teachers and researchers around the world. In the past four years, an extensive self-supporting user community was formed by users of GeoGebra and they share interactive teaching materials on the GeoGebraWiki and support fellow users through the GeoGebraForum. Volunteers from this community have also translated GeoGebra to 42 languages offering great opportunity to use the software in local languages and in multicultural environments. To be able to support such extensive user community, we established the International GeoGebra Institute (IGI). The principle aims of IGI are to develop a platform to offer training and support for teachers and to coordinate research in relation to GeoGebra. During the past year, eight local GeoGebra institutes were established. In this talk, we will share our ideas about IGI and outline the current developments of this project. We hope to nurture a network of people who can contribute to any aspects of GeoGebra based on their interests. [less ▲]

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See detailApplication of statistical shape analysis to the classification of renal tumours appearing in early childhood
Giebel, Stefan; Schenck, Jens-Peter; Schiltz, Jang UL

Scientific Conference (2009, July 01)

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See detailExpanding the field of science education: A conversation with Ken Tobin
Siry, Christina UL

in Eurasia Journal of Mathematics, Science and Technology Education (2009), 5(3), 197-208

This paper focuses on a conversation with Dr. Kenneth Tobin, which took place in June 2009 at The Graduate Center of the City University of New York (CUNY), where he is Presidential Professor in the Urban ... [more ▼]

This paper focuses on a conversation with Dr. Kenneth Tobin, which took place in June 2009 at The Graduate Center of the City University of New York (CUNY), where he is Presidential Professor in the Urban Education Program. Our purpose was to focus on Ken’s career in science education, and to discuss the past, present, and future of his research interests. During our conversation, we explored the various trajectories of his career, focusing on the ways in which his research has evolved through the years. Further, Ken shared his thoughts on the field of science education, and provided salient advice for early career scholars. This manuscript includes an introductory summary of Ken’s career achievements to this point, a record of our conversation (the audio-recording can be downloaded at the journal’s website) and a list of selected publications that highlight Ken’s key works. [less ▲]

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See detailFormation throughout the life and space practices of the students in the town of Paris
Rioux, Liliane; Pignault, Anne UL; Moch, Annie

Poster (2009, July)

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See detailAggregation functions
Grabisch, Michel; Marichal, Jean-Luc UL; Mesiar, Radko et al

Book published by Cambridge University Press (2009)

Aggregation is the process of combining several numerical values into a single representative value, and an aggregation function performs this operation. These functions arise wherever aggregating ... [more ▼]

Aggregation is the process of combining several numerical values into a single representative value, and an aggregation function performs this operation. These functions arise wherever aggregating information is important: applied and pure mathematics (probability, statistics, decision theory, functional equations), operations research, computer science, and many applied fields (economics and finance, pattern recognition and image processing, data fusion, etc.). This is a comprehensive, rigorous and self-contained exposition of aggregation functions. Classes of aggregation functions covered include triangular norms and conorms, copulas, means and averages, and those based on nonadditive integrals. The properties of each method, as well as their interpretation and analysis, are studied in depth, together with construction methods and practical identification methods. Special attention is given to the nature of scales on which values to be aggregated are defined (ordinal, interval, ratio, bipolar). It is an ideal introduction for graduate students and a unique resource for researchers. [less ▲]

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See detailWhat they highlight is: the discourse functions of basic wh-clefts in lectures
Deroey, Katrien UL

Scientific Conference (2009, July)

As part of a study of lecture functions in general and highlighting devices in specific, this paper presents the findings of an investigation into the discourse functions of basic wh-cleft clauses in a ... [more ▼]

As part of a study of lecture functions in general and highlighting devices in specific, this paper presents the findings of an investigation into the discourse functions of basic wh-cleft clauses in a corpus of lectures. These clauses, such as What our brains do is complicated information processing, are identifying constructions which background the information in the relative clause (What our brains do) and present the information foregrounded in the complement (complicated information processing) as newsworthy. Corpus-based studies of this construction to date have mainly described its function in writing (Collins 1991, Herriman 2003 & 2004) and spontaneous speech (Collins 1991 & 2006). From his examination of wh-clefts in speech and writing, Collins (1991: 214) concludes that ‘the linear progression from explicitly represented non-news to news offers speakers an extended opportunity to formulate the message’, while Biber et al (1999: 963) note that in conversation, speakers may use this construction with its typically low information content as ‘a springboard in starting an utterance’. With regard to academic speech, Rowley-Jolivet & Carter-Thomas (2003) found that basic wh-clefts are particularly effective in conference presentations to highlight the New and that their apparent ‘underlying presupposed question’ (p. 57) adds a dialogic dimension to monologic speech. All these features suggest that wh-clefts may be a useful in lectures, which are typically monologic and mainly concerned with imparting information. So far, however, studies on the function of these clefts in lectures have generally focussed on the function of part of the wh-clause as a lexical bundle (Biber 2006, Nesi & Basturkmen 2006) and mostly discussed its role as a discourse organising device. For the current investigation, a corpus of 12 lectures drawn from the British Academic Spoken English (BASE) Corpus were analysed. This yielded 132 basic wh-clefts, which were classified for their main discourse functions based on the presence of certain lexico-grammatical features, the functional relationship between the clefts and their co-text and an understanding of the purposes of and disciplinary variation within the lecture genre. Four main functional categories thus emerged: informing, evaluating, discourse organizing, evaluating and managing the class. These functions of wh-clefts and their relative frequency are discussed and related to lecture purposes; incidental findings on their co-occurrence with pauses and discourse markers are also touched upon. The study of this highlighting device in a lecture corpus thus aims to contribute to our understanding of what happens in authentic lectures and how this is reflected in the language. References Biber, D. (2006). University language: a corpus-based study of spoken and written registers. Studies in Corpus Linguistics 23. Amsterdam: John Benjamins Publishing Company. Biber, D., S. Johansson, G. Leech, S. Conrad, & E. Finegan (1999). The Longman grammar of spoken and written English. London: Longman. Collins, P. C. (1991). Cleft and pseudo-cleft constructions in English. London: Routledge. Collins, P. C. (2006). It-clefts and wh-clefts: prosody and pragmatics. Journal of Pragmatics, 38, 1706-1720. Herriman, J. (2003). Negotiating identity: the interpersonal functions of wh-clefts in English. Functions of Language, 10 (1), 1-30. Herriman, J. (2004). Identifying relations: the semantic functions of wh-clefts in English. Text, 24 (4), 447-469. Nesi, H. & Basturkmen, H. (2006). Lexical bundles and discourse signalling in academic lectures. International Journal of Corpus Linguistics, 11 (3), 283-304. Rowley-Jolivet, E. & Carter-Thomas, S. (2005). Genre awareness and rhetorical appropriacy: manipulation of information structure by NS and NNS scientists in the international conference setting. English for Specific purposes, 24, 41-64. [less ▲]

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See detailAn argument in favour of a more normative distinction between principals and accomplices in International Criminal Law
Pichou, Maria UL

in Hague Yearbook of International Law 2008 (2009), 21

While International Criminal Law ‘in action’ is recognized today as primarily criminal law, the rules of attribution are still underdeveloped. This article explores the reasons why the attribution of ... [more ▼]

While International Criminal Law ‘in action’ is recognized today as primarily criminal law, the rules of attribution are still underdeveloped. This article explores the reasons why the attribution of penalties in international criminal law requires a priori a differentiated approach depending on the degree of each person’s participation in the criminal act. Whatever the causes of the absence of a normative distinction regarding accomplice liability as far as penalties are concerned, this article proposes that International Criminal Law should provide that persons belonging to different categories of criminal conduct (perpetrators and participants) must be punished in different ways. The legal rules for this differentiated approach should be provided in the General Part of International criminal law, so that the principle of nullum crimen and nulla poena sine lege is fully upheld. From a practical point of view, the normative distinction might serve as a point of departure and guideline for the sentencing. [less ▲]

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See detailArrhythmias in primary care: Common treatment failures that could be adjusted
Lygidakis, Charilaos UL; Argyriadou, S.; Lygera, A. et al

in European Journal of General Practice (2009, July), 15(1), 42-43

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See detailTrillingen tijdens het boren van de Hubertustunnel
Van Baars, Stefan UL; Vink, J.W.

in Geotechniek (2009)

Tijdens het boren van de Hubertustunnel in Den Haag zijn geen schadelijke trillingen opgetreden, maar wel onverwachte hinderlijke trillingen. Bij het boorproces in bijvoorbeeld rotsformaties zijn ... [more ▼]

Tijdens het boren van de Hubertustunnel in Den Haag zijn geen schadelijke trillingen opgetreden, maar wel onverwachte hinderlijke trillingen. Bij het boorproces in bijvoorbeeld rotsformaties zijn dergelijke trillingen bekend, maar men had dit niet verwacht in het hier aanwezige strandzand. Uit analyse van de gemeten trillingen blijkt dat de trillingen voornamelijk zijn ontstaan door de stroeve voortgang van de TBM in het zand ten gevolge van het stick-slip effect. Het vooruit schokken van de TBM veroorzaakt hoofdzakelijk trillingen in boorrichting: schuifgolven langs de wand en drukgolven aan het boorfront. [less ▲]

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See detailStadtentstehung im mittelalterlichen und frühneuzeitlichen Nordwesteuropa
Pauly, Michel UL

in Geschichte in Wissenschaft und Unterricht (2009), 60(7/8/9), 406-420

Römische Siedlungsreste, Händlerniederlassungen, Dynastenburgen oder Abteien konnten Keimzellen der im Mittelalter neu entstehenden urbanen Siedlungen sein. Das ist gewusst. Und doch führten neue ... [more ▼]

Römische Siedlungsreste, Händlerniederlassungen, Dynastenburgen oder Abteien konnten Keimzellen der im Mittelalter neu entstehenden urbanen Siedlungen sein. Das ist gewusst. Und doch führten neue historische und archäologische Untersuchungen zu neuen Paradigmen in der Stadtgeschichtsforschung: Statt von einem topographischen Dualismus ist von polynuklearen Siedlungsansätzen auszugehen; Fördermaßnahmen des Stadtherrn spielten eine den kaufmännischen Initiativen mindestens ebenbürtige Rolle; die Schutzfunktion der Stadt besaß ursprünglich wohl mehr Gewicht als die wirtschaftlichen und religiösen Zentralfunktionen. [less ▲]

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See detailThe Error Probability of the Fixed-Complexity Sphere Decoder
Jalden, Joakim; Barbero, Luis G.; Ottersten, Björn UL et al

in IEEE Transactions on Signal Processing (2009), 57(7), 2711-2720

Download Citation Email Print Request Permissions Save to Project The fixed-complexity sphere decoder (FSD) has been previously proposed for multiple-input multiple-output (MIMO) detection in order to ... [more ▼]

Download Citation Email Print Request Permissions Save to Project The fixed-complexity sphere decoder (FSD) has been previously proposed for multiple-input multiple-output (MIMO) detection in order to overcome the two main drawbacks of the sphere decoder (SD), namely its variable complexity and its sequential structure. Although the FSD has shown remarkable quasi-maximum-likelihood (ML) performance and has resulted in a highly optimized real-time implementation, no analytical study of its performance existed for an arbitrary MIMO system. Herein, the error probability of the FSD is analyzed, proving that it achieves the same diversity as the maximum-likelihood detector (MLD) independent of the constellation used. In addition, it can also asymptotically yield ML performance in the high-signal-to-noise ratio (SNR) regime. Those two results, together with its fixed complexity, make the FSD a very promising algorithm for uncoded MIMO detection. [less ▲]

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See detailThe European Union, the Economic Crisis and Cross-border Insolvency
Lickova, Magdalena UL; Janda, Ivo

Article for general public (2009)

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