GeoGebra 3.2 – The new Spreadsheet View

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 ▲]

Etude in vivo des altérations de l’axe hypothalamo-hypophysaire adrénergique sur la douleur inflammatoire : approches comportementales et immunohistochimiques chez le rat 

Doctoral thesis (2009)

Symmetrien in der Natur. Was sagt uns die Mathematik hierzu

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 ▲]

Application of statistical shape analysis to the classification of renal tumours appearing in early childhood

Scientific Conference (2009, July 01)

Formation throughout the life and space practices of the students in the town of Paris

Poster (2009, July)

Qualität des Erlebens beim Unterrichten sowie bei der Zusammenarbeit von Klassenlehrpersonen und Lehrkräften Schulischer Heilpädagogik

Scientific Conference (2009, July)

What they highlight is: the discourse functions of basic wh-clefts in lectures

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 ▲]

An argument in favour of a more normative distinction between principals and accomplices in International Criminal Law

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 ▲]

Trillingen tijdens het boren van de Hubertustunnel

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 ▲]

The Error Probability of the Fixed-Complexity Sphere Decoder

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 ▲]