Florian Albrecht

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A computer learning system that aims at being efficient and gratifying has to adapt itself to the learner's needs. SmexWeb 1 (Student modelled exercising on the Web) as an adaptive hypermedia system offers advantageous features of the hypermedia paradigm. To take into account spatial and mental abilities of learners various techniques have been developed in(More)
Metal-organic complexes were formed by means of inelastic excitations in a scanning tunneling microscope (STM). The electronic structure of the complex was characterized using STM imaging and spectroscopy. By exploiting the symmetry of the complex, its electronic structure can be rationalized from linear combinations of molecular orbitals. The actual(More)
Before an object-based image classification can be used, one has to evaluate if it qualifies for its designated purpose, because uncertainty occurs in the complex process of object-based image analysis (OBIA). The range of potential OBIA applications produces objects of a variety of conceptualisations that require a flexible validation concept based on the(More)
Heterologous enzymes and binding proteins were secreted by the moss Physcomitrella patens or anchored extracellularly on its cell membrane in order to functionalize the apoplast as a biochemical reaction compartment. This modular membrane anchoring system utilizes the signal peptide and the transmembrane segment of the somatic embryogenesis receptor-like(More)
Complex real world phenomena require means for reducing and modelling the underlying complexity. They ask for methods and tools to exploit the crucial information intelligently, for addressing dynamics and monitoring constant changes. The project Biotope Information and Management System (BIMS), carried out in a 3654 km² sized area in the region of(More)
We believe that identifying media by their cognitive roles (e.g., definition, explanation, pseudo-code, visualization) can improve comprehension and usability in hypermedia systems designed for learning. We refer to media links organ ized around their cognitive role as cognitive media types [Recker, Ram, Shikano, Li, & Stasko, 1995]. Our hypothesis is that(More)
We study a thermally activated on-surface planarization reaction by a detailed analysis of the reactant and reaction products from atomically resolved atomic force microscopy (AFM) images and spectroscopy. The three-dimensional (3D) structure of the reactant, a helical diphenanthrene derivative, requires going beyond constant-height imaging. The(More)