Organisatorische Umsetzung eines E-Learning-Konzepts einer Hochschule am Beispiel des Zentrums virtUOS der Universität Osnabrück

Die ELAN-Initiative des Landes Niedersachsen treibt zurzeit den vermehrten Einsatz moderner E-Learning-Konzepte in Form dreier Pilotprojekte mit dem Ziel voran, landesweit ein akademisches Kompetenznetzwerk aufzubauen. Sämtliche Hochschulen des Landes sollen von den Kompetenzen der jeweils anderen Universitäten und Fachhochschulen profitieren und die Lehre damit effizienter gestalten. Die an einem dieser Piloten beteiligte Universität Osnabrück nahm die Initiative zum Anlass, ein neues Dienstleistungszentrum zu gründen, dessen Aufgabe sich durch die Unterstützung der multi- und telemedialen Lehre definiert. Dieser Beitrag gibt einen Einblick in die Organisation dieses Zentrums, dessen Forschungs- und Dienstleistungen und zeigt die daraus resultierenden Vorteile auf. (DIPF/Orig.)

Ansatzpunkte für das Change-Management beim Aufbau einer Notebook-Universität

Die Einführung von Notebooks an einer Universität bringt zunächst keine grundlegende Innovation mit sich. Die Potenziale, die mit dem Einsatz von Notebooks in der Präsenzlehre verbunden sind, sind vielfältig. Der Beitrag zeigt auf, welche Vorteile der Notebook-Einsatz auf den unterschiedlichen Ebenen Individuum, Gruppe und Organisation beinhaltet. Am Beispiel des eCampus-Projektes der Universität Duisburg-Essen zeigt sich, dass dieser Mehrwert sich jedoch nicht von selbst einstellt, sondern an bestimmte Bedingungen auf den verschiedenen Ebenen geknüpft ist. Es sind Maßnahmen notwendig, um die intendierten Veränderungsprozesse in Gang zu setzen, damit Notebooks im Alltag von Lehre und Forschung verankert werden können. Dazu sind Maßnahmen in den Bereichen Infrastruktur, didaktische Reform, Personal- und Organisationsentwicklung sowie Medienproduktion und -distribution zu ergreifen und in einem angemessenen Gleichgewicht umzusetzen. (DIPF/Orig.)

Aufbau von Blended Learning mit der open source E-Lernplattform ILIAS an einer Campus-Universität. Was motiviert zum Einsatz im Lehr- und Lernalltag?

In diesem Beitrag geht es um das Projekt E-Lernen auf der ILIAS-Plattform an der Universität der Bundeswehr Hamburg (E-L I-P UniBwH). Ziel des Projekts ist es, die Präsenzlehre mit dem Einsatz elektronischer Medien zu unterstützen. Im Beitrag werden Ansatzpunkte dargestellt, die die Lehrenden zum Gebrauch der E-Lernplattform motivieren. Es werden Bedarfsmöglichkeiten aufgezeigt, für die eine E-Lernplattform eine mögliche Lösung sein kann, sowie die Rahmenbedingungen benannt, unter denen sie eingesetzt wird. Ziel ist es, die Nachhaltigkeit des E-Lernens an der UniBwH zu fördern.(DIPF/Orig.)

'Anyone Can Edit' : Vom Nutzer zum Produtzer

Über die letzten Jahre hat sich einige öffentliche und kommerzielle Aufmerksamkeit auf ein Phänomen gerichtet, das sich anschickt, die Medienlandschaft grundlegend zu verändern. Yahoo! kaufte Flickr. Google erwarb YouTube. Rupert Murdoch kaufte MySpace, und erklärte, die Zukunft seines NewsCorp-Imperiums läge eher in der nutzergesteuerten Inhaltserschaffung innerhalb solcher sozialer Medien als in seinen vielen Zeitungen, Fernsehsendern und anderen Medieninteressen (2005). Schließlich brach TIME mit seiner langetablierten Tradition, eine herausragende Persönlichkeit als „Person des Jahres“ zu nominieren, und wählte stattdessen „You“: uns alle, die wir online in Kollaboration Inhalte schaffen (2006). Allerdings liegt die Bedeutung dieses nutzergesteuerten Phänomens nicht in solchen (letztlich unwichtigen) Ehrungen, oder auch nur in den Inhalten zentraler Websites wie YouTube und Flickr – vielmehr findet man sie in logischer Folge der ihr zugrunde liegenden Prinzipien (die wir hier weiter untersuchen werden) viel flächendeckender über das World Wide Web verbreitet; was wichtig ist am neuen Phänomen ist nicht nur der Erfolg seiner sichtbarsten Exponenten, sondern auch der „Long Tail“ (Anderson 2006) der vielen anderen nutzergesteuerten Projekte, die sich überall in der Online-Welt etabliert haben und jetzt beginnen, sich sogar in die Offline-Welt hinein auszubreiten.

Towards distributed citizen participation : lessons from WikiLeaks and the Queensland Floods

This paper examines the rapid and ad hoc development and interactions of participative citizen communities during acute events, using the examples of the 2011 floods in Queensland, Australia, and the global controversy surrounding Wikileaks and its spokesman, Julian Assange. The self-organising community responses to such events which can be observed in these cases bypass or leapfrog, at least temporarily, most organisational or administrative hurdles which may otherwise frustrate the establishment of online communities; they fast-track the processes of community development and structuration. By understanding them as a form of rapid prototyping, e-democracy initiatives can draw important lessons from observing the community activities around such acute events.

Compact arrays for mobile platforms : trade-off between size and performance for SDMA and MIMO applications

Smart antenna receiver and transmitter systems consist of multi-port arrays with an individual receiver channel (including ADC) and an individual transmitter channel (including DAC)at every of the M antenna ports, respectively. By means of digital beamforming, an unlimited number of simultaneous complex-valued vector radiation patterns with M-1 degrees of freedom can be formed. Applications of smart antennas in communication systems include space-division multiple access. If both stations of a communication link are equipped with smart antennas (multiple-input-multiple-output, MIMO). multiple independent channels can be formed in a "multi-path-rich" environment. In this article, it will be shown that under certain circumstances, the correlation between signals from adjacent ports of a dense array (M + ΔM elements) can be kept as low as the correlation between signals from adjacent ports of a conventional array (M elements and half-wavelength pacing). This attractive feature is attained by means of a novel approach which employs a RF decoupling network at the array ports in order to form new ports which are decoupled and associated with mutually orthogonal (de-correlated) radiation patterns.

Estimating the probability of an invalid match for matching using the rank transform

A fundamental problem faced by stereo matching algorithms is the matching or correspondence problem. A wide range of algorithms have been proposed for the correspondence problem. For all matching algorithms, it would be useful to be able to compute a measure of the probability of correctness, or reliability of a match. This paper focuses in particular on one class for matching algorithms, which are based on the rank transform. The interest in these algorithms for stereo matching stems from their invariance to radiometric distortion, and their amenability to fast hardware implementation. This work differs from previous work in that it derives, from first principles, an expression for the probability of a correct match. This method was based on an enumeration of all possible symbols for matching. The theoretical results for disparity error prediction, obtained using this method, were found to agree well with experimental results. However, disadvantages of the technique developed in this chapter are that it is not easily applicable to real images, and also that it is too computationally expensive for practical window sizes. Nevertheless, the exercise provides an interesting and novel analysis of match reliability.

High altitude stereo visual odometry

Stereo visual odometry has received little investigation in high altitude applications due to the generally poor performance of rigid stereo rigs at extremely small baseline-to-depth ratios. Without additional sensing, metric scale is considered lost and odometry is seen as effective only for monocular perspectives. This paper presents a novel modification to stereo based visual odometry that allows accurate, metric pose estimation from high altitudes, even in the presence of poor calibration and without additional sensor inputs. By relaxing the (typically fixed) stereo transform during bundle adjustment and reducing the dependence on the fixed geometry for triangulation, metrically scaled visual odometry can be obtained in situations where high altitude and structural deformation from vibration would cause traditional algorithms to fail. This is achieved through the use of a novel constrained bundle adjustment routine and accurately scaled pose initializer. We present visual odometry results demonstrating the technique on a short-baseline stereo pair inside a fixed-wing UAV flying at significant height (~30-100m).

Development of a computer based 1D-2D dynamic flood model. Case study of the Pagsangaan river basin in Leyte, the Philippines

Floods are among the most devastating events that affect primarily tropical, archipelagic countries such as the Philippines. With the current predictions of climate change set to include rising sea levels, intensification of typhoon strength and a general increase in the mean annual precipitation throughout the Philippines, it has become paramount to prepare for the future so that the increased risk of floods on the country does not translate into more economic and human loss. Field work and data gathering was done within the framework of an internship at the former German Technical Cooperation (GTZ) in cooperation with the Local Government Unit of Ormoc City, Leyte, The Philippines, in order to develop a dynamic computer based flood model for the basin of the Pagsangaan River. To this end, different geo-spatial analysis tools such as PCRaster and ArcGIS, hydrological analysis packages and basic engineering techniques were assessed and implemented. The aim was to develop a dynamic flood model and use the development process to determine the required data, availability and impact on the results as case study for flood early warning systems in the Philippines. The hope is that such projects can help to reduce flood risk by including the results of worst case scenario analyses and current climate change predictions into city planning for municipal development, monitoring strategies and early warning systems. The project was developed using a 1D-2D coupled model in SOBEK (Deltares Hydrological modelling software package) and was also used as a case study to analyze and understand the influence of different factors such as land use, schematization, time step size and tidal variation on the flood characteristics. Several sources of relevant satellite data were compared, such as Digital Elevation Models (DEMs) from ASTER and SRTM data, as well as satellite rainfall data from the GIOVANNI server (NASA) and field gauge data. Different methods were used in the attempt to partially calibrate and validate the model to finally simulate and study two Climate Change scenarios based on scenario A1B predictions. It was observed that large areas currently considered not prone to floods will become low flood risk (0.1-1 m water depth). Furthermore, larger sections of the floodplains upstream of the Lilo- an’s Bridge will become moderate flood risk areas (1 - 2 m water depth). The flood hazard maps created for the development of the present project will be presented to the LGU and the model will be used to create a larger set of possible flood prone areas related to rainfall intensity by GTZ’s Local Disaster Risk Management Department and to study possible improvements to the current early warning system and monitoring of the basin section belonging to Ormoc City; recommendations about further enhancement of the geo-hydro-meteorological data to improve the model’s accuracy mainly on areas of interest will also be presented at the LGU.

Designing mobile systems for social navigation in urban public places

This thesis presents social requirements and design considerations from a study evaluating interactive approaches to social navigation and user-generated information sharing in urban environments using mobile devices. It investigates innovative ways to leverage mobile information and communication technology in order to provide a social navigation platform for residents and visitors in and for public urban places. Through a design case study this work presents CityFlocks, a mobile information system that offers an easy way for information-seeking new residents or visitors to access tacit knowledge from local people about their new community. It is intended to enable visitors and new residents in a city to tap into the knowledge and experiences of local residents in order to gather information about their new environment. Its design specifically aims to lower existing barriers of access and facilitate social navigation in urban places. In various user tests it evaluates two general user interaction alternatives – direct and indirect social navigation – and analyses which interaction method works better for people using a mobile device to socially navigate urban environments. The outcomes are relevant for the user interaction design of future mobile information systems that leverage the social navigation approach.

Developing a dashboard for real-time data stream composition and visualization

Technological advances have led to an influx of affordable hardware that supports sensing, computation and communication. This hardware is increasingly deployed in public and private spaces, tracking and aggregating a wealth of real-time environmental data. Although these technologies are the focus of several research areas, there is a lack of research dealing with the problem of making these capabilities accessible to everyday users. This thesis represents a first step towards developing systems that will allow users to leverage the available infrastructure and create custom tailored solutions. It explores how this notion can be utilized in the context of energy monitoring to improve conventional approaches. The project adopted a user-centered design process to inform the development of a flexible system for real-time data stream composition and visualization. This system features an extensible architecture and defines a unified API for heterogeneous data streams. Rather than displaying the data in a predetermined fashion, it makes this information available as building blocks that can be combined and shared. It is based on the insight that individual users have diverse information needs and presentation preferences. Therefore, it allows users to compose rich information displays, incorporating personally relevant data from an extensive information ecosystem. The prototype was evaluated in an exploratory study to observe its natural use in a real-world setting, gathering empirical usage statistics and conducting semi-structured interviews. The results show that a high degree of customization does not warrant sustained usage. Other factors were identified, yielding recommendations for increasing the impact on energy consumption.