TY - GEN A1 - Engbert, Ralf A1 - Nuthmann, Antje A1 - Richter, Eike M. A1 - Kliegl, Reinhold T1 - SWIFT: A Dynamical Model of Saccade Generation during Reading N2 - Mathematical models have become an important tool for understanding the control of eye movements during reading. Main goals of the development of the SWIFT model (Engbert, Longtin, & Kliegl, 2002)were to investigate the possibility of spatially distributed processing and to implement a general mechanism for all types of eye movements we observe in reading experiments. Here, we present an advanced version of SWIFT which integrates properties of the oculomotor system and effects of word recognition to explain many of the experimental phenomena faced in reading research. We propose new procedures for the estimation of model parameters and for the test of the model’s performance. A mathematical analysis of the dynamics of the SWIFT model is presented. Finally, within this framework, we present an analysis of the transition from parallel to serial processing. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - paper 254 Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-57145 ER - TY - GEN A1 - Rolfs, Martin A1 - Engbert, Ralf A1 - Kliegl, Reinhold T1 - Crossmodal coupling of oculomotor controland spatial attention in vision and audition N2 - Fixational eye movements occur involuntarily during visual fixation of stationary scenes. The fastest components of these miniature eye movements are microsaccades, which can be observed about once per second. Recent studies demonstrated that microsaccades are linked to covert shifts of visual attention [e.g., Engbert & Kliegl (2003), Vision Res 43:1035-1045]. Here,we generalized this finding in two ways. First, we used peripheral cues, rather than the centrally presented cues of earlier studies. Second, we spatially cued attention in vision and audition to visual and auditory targets. An analysis of microsaccade responses revealed an equivalent impact of visual and auditory cues on microsaccade-rate signature (i.e., an initial inhibition followed by an overshoot and a final return to the pre-cue baseline rate). With visual cues or visual targets,microsaccades were briefly aligned with cue direction and then opposite to cue direction during the overshoot epoch, probably as a result of an inhibition of an automatic saccade to the peripheral cue. With left auditory cues and auditory targets microsaccades oriented in cue direction. Thus, microsaccades can be used to study crossmodal integration of sensory information and to map the time course of saccade preparation during covert shifts of visual and auditory attention. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - paper 234 KW - Microsaccades KW - Covert orienting KW - Fixational eye movements KW - Multisensory Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-56804 ER - TY - INPR A1 - Fradon, Myriam A1 - Roelly, Sylvie T1 - Infinite system of Brownian Balls: Equilibrium measures are canonical Gibbs N2 - We consider a system of infinitely many hard balls in Rd undergoing Brownian motions and submitted to a smooth pair potential. It is modelized by an infinite-dimensional Stochastic Differential Equation with a local time term. We prove that the set of all equilibrium measures, solution of a Detailed Balance Equation, coincides with the set of canonical Gibbs measures associated to the hard core potential added to the smooth interaction potential. T3 - Mathematische Statistik und Wahrscheinlichkeitstheorie : Preprint - 2005, 02 KW - Stochastic Differential Equation KW - hard core potential KW - Canonical Gibbs measure KW - detailed balance equation KW - reversible measure Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-51594 ER - TY - JOUR A1 - Doherr, Detlev T1 - The Humboldt Digital Library BT - Exploring Innovative Structures JF - HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies N2 - Alexander von Humboldt’s maps, graphs and illustrations contain a great deal of detail, but in the available rare editions they are hardly visible to the naked eye. In many editions they have been reduced. In a digital library, they will become accessible in their entirety, and Internet technology will reproduce them in a form that overcomes the limitations of the original printing. The user will be able to enlarge the images and see details that might have been overlooked in the past. The Humboldt’s digital library will adhere to the standards for digital libraries established by the Open Archives Initiative (OAI) and the tools EPRINTS and DSPACE to provide the Web services and determine the most effective way to establish dynamic linking and knowledge based searching of information within the archive. N2 - Alexander von Humboldts Karten, Bilder und Illustrationen enthalten eine Vielzahl von Details, die in den verfügbaren Ausgaben seiner Werke mit bloßem Auge kaum oder wegen Reduzierung der Auflösungen gar nicht sichtbar sind. In einer digitalen Bibliothek sind diese Informationen komplett zugänglich, ja die Internettechnologie läßt es zu, diese in einer Form zu reproduzieren, die die Grenzen des herkömmlichen Ausdruckens sprengen. Der Nutzer ist in der Lage, die Bilder zu vergrößern und Details zu erkennen, die möglicherweise sonst übersehen werden könnten. Die digitale Bibliothek über Humboldt entspricht den Standards, die die Open Archives Initiative (OAI) definiert hat. Als Plattform werden serverseitig die Programme EPRINTS und DSPACE eingesetzt, um einen geeigneten Internet-Dienst anzubieten und effektive Möglichkeiten zur dynamischen Verbindung von Informationen und wissensbasierter Informationsrecherche im gesamten Archiv zu entwickeln. N2 - Los mapas, cuadros e ilustraciones de Alexander von Humboldt contienen gran cantidad de detalles, los cuales, en las ediciones disponibles de sus obras, son apenas visibles, o por reducción de la resolución ya son invisibles. En una biblioteca digital esta información es completamente accesible, ya que la tecnología del internet permite reproducirlas de modo tal que va más allá de los límites de la impresión común. El usuario tiene la posibilidad de ampliar los cuadros y reconocer detalles que normalmente pasarían inadvertidos. La biblioteca digital sobre Humboldt cumple con los estándares definidos por la Iniciativa de Archivos Abiertos, OAI (Open Archives Initiative). Como plataforma del servidor se hace uso de los programas EPRINTS y DSPACE, permitiendo así brindar un adecuado servicio de Internet y desarrollar posibilidades efectivas de relacionar dinámicamente las informaciones con las búsquedas basadas en conocimientos de todo el archivo. KW - Elektronische Edition KW - Google KW - Humboldt Digital Library KW - Pflanzengeographie KW - Volltext Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-35215 SN - 1617-5239 SN - 2568-3543 VL - VI IS - 10 SP - 30 EP - 34 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Clark, Rex T1 - Alexander von Humboldt’s images of landscape and the ‘Chaos of the Poets’ JF - HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies N2 - Alexander von Humboldt’s descriptions of volcanic mountains in his travel journals (Reise auf dem Río Magdalena, durch die Anden und Mexico) show both his reliance on and impatience with literary conventions and travel narratives. Using Goethe’s Italienische Reise and Bürger’s Münchhausen as points of comparison for literary treatments of the volcano ascent, Humboldt’s process of writing is examined. Humboldt shows the failure of the existing discourse and begins to experiment with narratives which fragment and recombine personal and historical modes of writing with, in this case, images from new technical inventions which visualize landscape according to fundamental scientific principles. While the inclusion of scientific prose is relevant, Humboldt’s link to modernity is based on experimental narrative techniques which draw upon changing sets of discourse practices to describe complex realities. N2 - Alexander von Humboldts Beschreibungen von Vulkanen in seinen Reiseberichten (Reise auf dem Río Magdalena, durch die Anden und Mexico) zeigen sowohl das Zutrauen zu als auch die Ungeduld mit literarischen Konventionen und Reiseerzählungen. Indem Goethes „Italienische Reise“ und Bürgers „Münchhausen“ als Vergleichsstoffe für literarische Darstellungen der Vulkanbesteigung herangezogen werden, untersucht der Aufsatz Humboldts Schreibprozeß, um moderne Formen von Abbildung und Metapher zu finden. N2 - Las descripciones de Alexander von Humboldt de las cadenas montañosas de formación volcánica en su relación de viaje evidencian tanto confianza como impaciencia con respecto a los relaciones de viaje de otros cronistas tomados como modelos literarios. En la comparación con “El viaje italiano“, de Goethe, y con “Münchhausen“, de Bürger, como ejemplos literarios de ascensiones a volcanes, se analiza el proceso de escritura de Humboldt para buscar formas modernas de ilustración y metáfora. KW - Gottfried August Bürger KW - Münchhausen KW - Johann Wolfgang von Goethe KW - Italienische Reise Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-35209 SN - 1617-5239 SN - 2568-3543 VL - VI IS - 10 SP - 21 EP - 29 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Baron, Frank T1 - From Alexander von Humboldt to Frederic Edwin Church BT - Voyages of Scientific Exploration and Creativity JF - HIN : Alexander von Humboldt im Netz ; international review for Humboldtian studies N2 - Stephen Jay Gould wrote recently that “when Church began to paint his great canvases, Alexander von Humboldt may well have been the world’s most famous and influential intellectual.” Humboldt’s influence in the case of the landscape artist Church is especially interesting. If we examine the precise relationship between the German explorer and his American admirer, we gain an insight into how Humboldt transformed Church’s life and signaled a new phase in the career of the artist. Church retraced Humboldt’s travels in Ecuador and in Mexico. If we compare the texts available to Church and the comparison of Church’s paintings and the texts and images of Humboldt’s works we can arrive at new perspectives on Humboldt’s extraordinary influence on American landscape painting in the nineteenth century. N2 - Der amerikanische Wissenschaftshistoriker Stephen Jay Gould stellte fest, daß Alexander von Humboldt um die Mitte des neunzehnten Jahrhunderts vielleicht der berühmteste und einflußreichste Intellektuelle gewesen sei. Zu diesem Zeitpunkt bietet Humboldts Einfluß auf den Landschaftsmaler Church einen besonders interessanten Fall. Wenn wir die Beziehungen zwischen dem deutschen Entdeckungsreisenden und seinem amerikanischen Bewunderer näher betrachten, erfahren wir, wie die Impulse von Humboldt das Leben und die Karriere des Künstlers in ganz neue Richtungen führten. Church besuchte mehrere von Humboldt beschriebene Orte in Ekuador und Mexiko. Der Vergleich der veröffentlichten Texte und Abbildungen Humboldts mit den Gemälden von Church liefert neue Perspektiven, in welcher Weise Humboldt die amerikanische Landschaftsmalerei des neunzehnten Jahrhunderts beeinflußt hat. N2 - El historiador norteamericano Stephen Jay Gould afirmó que Alexander von Humboldt fue posiblemente el más famoso e influyente intelectual a mediados del siglo XIX. Para ese entonces, la influencia de Humboldt sobre el paisajista Church ofrece un caso especialmente interesante. Si analizamos las relaciones entre el explorador alemán y su admirador norteamericano con mayor detalle, nos enteramos cómo los impulsos de Humboldt llevaron la vida y carrera del artista por carriles totalmente nuevos. Church visitó varios de los lugares descritos por Humboldt en Ecuador y México. La comparación de los textos e ilustraciones publicados de Humboldt con las pinturas de Church ofrece nuevas perspectivas acerca de la extraordinaria influencia de Humboldt en la pintura paisajista norteamericana del siglo XIX. KW - bildende Kunst KW - Humboldt als Vorbild KW - Frederic Edwin Church Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-35194 SN - 1617-5239 SN - 2568-3543 VL - VI IS - 10 SP - 7 EP - 20 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Zemtsov, Alexander T1 - Alexander von Humboldt’s ideas on volcanism and their influence on Russian scientists N2 - The article provides historical background for Alexander von Humboldt’s expedition into Russia in 1829. It includes information on Humboldt’s works and publications in Russia over the course of his lifetime, as well as an explanation of the Russian scientific community’s response to those works. Humboldt’s ideas on the existence of an active volcano in Central Asia attracted the attention of two prominent Russian geographers, P. Semenov and P. Kropotkin, whose views on the nature of volcanism were quite different. P. Semenov personally met Humboldt in Berlin. P. Kropotkin made one of the most important geological discoveries of the 19th Century: he found the fresh volcanic cones near Lake Baikal. Soon after Humboldt’s Russian expedition, and partly as a result of it, an important mineral was found in the Ilmen mountains – samarskite, which later gave its name to the chemical element Samarium, developed in 1879. At the beginning of the 20th Century, the Russian scientist V. Vernadskiy pointed out that samarskite was the first uranium-rich mineral found in Russia. KW - 1829 KW - P. Kropotkin KW - P. Semenov KW - Samarium KW - Vulkanismus Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-35335 SN - 1617-5239 SN - 2568-3543 VL - VI IS - 11 SP - 31 EP - 37 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - BOOK A1 - Kuropka, Dominik A1 - Meyer, Harald T1 - Survey on Service Composition N2 - It is predicted that Service-oriented Architectures (SOA) will have a high impact on future electronic business and markets. Services will provide an self-contained and standardised interface towards business and are considered as the future platform for business-to-business and business-toconsumer trades. Founded by the complexity of real world business scenarios a huge need for an easy, flexible and automated creation and enactment of service compositions is observed. This survey explores the relationship of service composition with workflow management—a technology/ concept already in use in many business environments. The similarities between the both and the key differences between them are elaborated. Furthermore methods for composition of services ranging from manual, semi- to full-automated composition are sketched. This survey concludes that current tools for service composition are in an immature state and that there is still much research to do before service composition can be used easily and conveniently in real world scenarios. However, since automated service composition is a key enabler for the full potential of Service-oriented Architectures, further research on this field is imperative. This survey closes with a formal sample scenario presented in appendix A to give the reader an impression on how full-automated service composition works. T3 - Technische Berichte des Hasso-Plattner-Instituts für Digital Engineering an der Universität Potsdam - 10 Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-33787 SN - 3-937786-78-3 SN - 978-3-937786-78-0 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - BOOK A1 - Döllner, Jürgen Roland Friedrich A1 - Kirsch, Florian A1 - Nienhaus, Marc T1 - Visualizing Design and Spatial Assembly of Interactive CSG N2 - For interactive construction of CSG models understanding the layout of a model is essential for its efficient manipulation. To understand position and orientation of aggregated components of a CSG model, we need to realize its visible and occluded parts as a whole. Hence, transparency and enhanced outlines are key techniques to assist comprehension. We present a novel real-time rendering technique for visualizing design and spatial assembly of CSG models. As enabling technology we combine an image-space CSG rendering algorithm with blueprint rendering. Blueprint rendering applies depth peeling for extracting layers of ordered depth from polygonal models and then composes them in sorted order facilitating a clear insight of the models. We develop a solution for implementing depth peeling for CSG models considering their depth complexity. Capturing surface colors of each layer and later combining the results allows for generating order-independent transparency as one major rendering technique for CSG models. We further define visually important edges for CSG models and integrate an image-space edgeenhancement technique for detecting them in each layer. In this way, we extract visually important edges that are directly and not directly visible to outline a model’s layout. Combining edges with transparency rendering, finally, generates edge-enhanced depictions of image-based CSG models and allows us to realize their complex, spatial assembly. T3 - Technische Berichte des Hasso-Plattner-Instituts für Digital Engineering an der Universität Potsdam - 07 Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-33771 SN - 978-3-937786-56-2 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Tarkhanov, Nikolai Nikolaevich A1 - Vasilevski, Nikolai T1 - Microlocal analysis of the Bochner-Martinelli integral N2 - In order to characterise the C*-algebra generated by the singular Bochner-Martinelli integral over a smooth closed hypersurfaces in Cn, we compute its principal symbol. We show then that the Szegö projection belongs to the strong closure of the algebra generated by the singular Bochner-Martinelli integral. T3 - Preprint - (2005) 25 Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-30012 ER -