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Kempen wird zum Reallabor
(2019)
Berechnungs- und Auslegungstool zur energieeffizienten Kühlung von Gebäuden (Coolplan). P5-28
(2014)
Alltag und Soziale Arbeit in der Corona-Pandemie. Einblicke in Perspektiven der Adressat*innen
(2022)
Wie ergeht es Menschen in ohnehin schon schwierigen Lebenslagen während der Corona-Krise? Ziel des Sammelbandes ist es, die Perspektive von Adressat*innen und Nutzer*innen Sozialer Arbeit auf die durch die Corona-Krise bedingten Veränderungen ihrer Alltagswelten und die Angebote Sozialer Arbeit empirisch aufzuzeigen. Hierzu werden im Sammelband sowohl erste empirische Analysen dargestellt als auch die vorliegenden Ergebnisse übergreifend auf Theoriedebatten sowie Impulse für Praxis und Forschung Sozialer Arbeit hin diskutiert.
Der gegenwärtigen empirischen Leerstelle bezogen auf die Wahrnehmung der Krise von Adressat*innen und Nutzer*innen Sozialer Arbeit steht aktuell eine weit verbreitete Sorge dem Wohlergehen der Adressat*innen Sozialer Arbeit entgegen. Seit April 2020 gibt es eine Vielzahl an Problemaufrissen, Brandbriefen, problematisierenden Analysen, die die Corona-Krise als Verstärkerin ohnehin bestehender sozialer Ungleichheiten betrachten und je nach Ausrichtung politische Interventionen fordern. Ein Großteil dieser Analysen bezieht sich entweder auf Einschätzungen von Sozialarbeiter*innen oder auf analytische Schlüsse.
Im Vergleich zur Perspektive der Sozialen Arbeit als Profession gibt es dagegen bisher kaum Veröffentlichungen zu der Frage, wie die Adressat*innen und Nutzer*innen Sozialer Arbeit selbst die Corona-Krise betrachten und erleben, die in all ihrer Unterschiedlichkeit doch gemein haben, dass sie zumeist über unterdurchschnittliche soziale, ökonomische und kulturelle Ressourcen verfügen. Als Fachgruppe Adressat*innen, Nutzer*innen und (Nicht)Nutzung Sozialer Arbeit der DGSA fühlen wir uns jedoch genau dieser Perspektive besonders verpflichtet: diejenigen zu Wort kommen zu lassen, ,über die in der Sozialen Arbeit meist nur gesprochen wird
Wear it or fear it: exploration of drivers & barriers in smartwatch acceptance by senior citizens
(2018)
Shadows in computer graphics are an important rendering aspect for spatial objects. For realtime computer applications such as games, it is essential to represent shadows as accurate as possible. Also, various tv stations work with virtual studio systems instead of real studio sets. Especially for those systems, a realistic impression of the rendered and mixed scene is important. One challenge, hence, is the creation of a natural shadow impression. This paper presents the results of an empirical study to compare the performance and quality of different shadow mapping methods. For this test, a prototype studio renderer was developed. A percentage closer filter (pcf) with a number of specific resolutions is used to minimize the aliasing issue. More advanced algorithms which generate smooth shadows like the percentage closer soft shadow (pcss) method as well as the variance shadow maps (vsm) method are analysed. Different open source apis are used to develop the virtual studio renderer, giving the benefit of permanent enhancement. The Ogre 3D graphic engine is used to implement the rendering system, benefiting from various functions and plugins. The transmission of the tracking data is accomplished with the vrpn server/client and the Intersense api. The different shadow algorithms are compared in a virtual studio environment which also casts real shadows and thus gives a chance for a direct comparison throughout the empirical user study. The performance is measured in frames per secon
Poincaré gauge theory of gravity: Friedman cosmology with even and odd parity modes: Analytic part
(2011)
In order to improve the interactivity between users and computers, recent technologies focus on incorporating gesture recognition into interactive systems. The aim of this article is to evaluate the effectiveness of using a Myo control armband and the Kinect 2 for recognition of gestures in order to interact with virtual objects in a weather report scenario. The Myo armband has an inertial measurement unit and is able to read electrical activity produced by skeletal muscles, which can be recognized as gestures, which are trained by machine learning. A Kinect sensor was used to build up a dataset which contains motion recordings of 8 different gestures and was also build up by a gesture training machine learning algorithm. Both input methods, the Kinect 2 and the Myo armband, were evaluated with the same interaction patterns in a user study, which allows a direct comparison and reveals benefits and limits of each technique.
In this paper we propose an integrated immersive augmented reality solution for a software tool supporting spacecraft design and verification. The spacecraft design process relies on expertise in many domains, such as thermal and structural engineering. The various subsystems of a spacecraft are highly interdependent and have differing requirements and constraints. In this context, interactive visualizations play an important role in making expert knowledge accessible. Recent immersive display technologies offer new ways of presenting and interacting with computer-generated content. Possibilities and challenges for spacecraft configuration employing these technologies are explored and discussed. A user interface design for an application using the Microsoft HoloLens is proposed. To this end, techniques for selecting a spacecraft component and manipulating its position and orientation in 3D space are developed and evaluated. Thus, advantages and limitations of this approach to spacecraft configuration are revealed and discussed.
Was ist eigentlich ein "UnSeminar"? Prof. Marmann aus dem Fachbereich Medien der Hochschule Düsseldorf erklärt in einem Interview mit dem Hochschulradio Düsseldorf sein Konzept für die Durchführung von Seminaren, das den Teilnehmerinnen und Teilnehmern sehr viel Freiheit in der (digitalen) Ausgestaltung der Themen bietet.
In Anlehnung an das Barcamp-Format, das auch "Unkonferenz" genannt wird, werden die Seminarthemen erst im Verlauf der Veranstaltung und durch Teilnehmenden entwickelt. Hierzu dienen mehrere Feedbackschleifen. Darüber hinaus kommen in den Unseminaren verschiedene digitale Technologien zur Organisation, zur Kommunikation und zur Kreation zum Einsatz, um en passant auch die Digitalkompetenz der Studierenden weiterzuentwickeln. So ist z.B. ein Multimedia-Abstract Bestandteil eines jeden Seminarbeitrages und die Seminarbeiträge selbst werden mit einem typischen Blogsystem ausgearbeitet. Alle Beiträge sind innerhalb des Fachbereichs für interessierte Studierende einsehbar, so dass Studierende auch von Kommilitonen lernen können.
Computational investigation of oxy-combustion of pulverized coal and biomass in a swirl burner
(2022)
Experimental investigation of heat transfer performance of corrugated tube with spring tape inserts
(2019)
Leading edge serrations are well-known for their aeroacoustic potential in reducing aerofoil-turbulence interaction noise and are also associated with certain aerodynamic advantages. To prepare leading edge serrations for industrial application, two obstacles remain to be addressed. First is a combined analysis of the aeroacoustic and the aerodynamic performance of leading edge serrations to develop optimum designs. Second is the need to examine the transferability of the known effects of leading edge serrations from a single aerofoil to full rotors, which are considered to be the final area of application.
This thesis aims to assist in the transfer of a well-investigated aerofoil with serrated leading edges from the rigid to the rotating domain. With this purpose, a single aerofoil type is selected and thoroughly analysed, experimentally and numerically, to generate a reliable data basis for aerodynamic performance and noise reduction capability. Aside from gathering information on the overall performance, the spatial distribution of the noise sources is localised, and the spectral composition of the noise reduction is found to follow a clearly defined scaling law. Aerodynamically, generated vortices are found to be responsible for a complex three-dimensional separation mechanism of the leading edge serrations, causing a delay of stall.
The generated data basis is then used to design low-pressure axial fans of minimum complexity by keeping the initially chosen aerofoil type. The experimentally identified noise reduction mechanisms for the serrated axial fans are found to be more diverse than the single aerofoil and highly dependent on the inflow conditions and the operation point of the fan. A highly similar pattern for the spectral scaling of the noise reduction supports the finding that at optimum operation conditions, the previously identified noise reduction mechanisms for the single aerofoils are transferable to the rotating domain. On the other hand, additional aerodynamic mechanisms are found to dominate the noise reduction for the instability region of the fan, also contributing to reduced blade-to-blade interaction effects. Moreover, the blade-tip leakage flow is altered by delaying the development of coherent structures.
The next step towards a more general description of the aeroacoustic and aerodynamic dependencies is developing a comprehensive model based on artificial neural networks. This model allows a combined analysis of the aerodynamic and acoustic performance of rotors with serrated leading edges and shows an accurate prediction of the overall performance and the spectral composition of the radiated noise. It also enables the development of multi-objective optima for serration designs and motivates further studies into the generalisability of the observed trends. Furthermore, the developed model represents a feasible tool to create tailored serration designs for maximum efficiency in both aeroacoustics and aerodynamics, contributing to the development of future low-noise fans and rotating machinery.
Altenhilfe
(2020)
Rezension zu: Reinhard Stockmann (2006): Evaluation und Qualitätsentwicklung. Münster u.a.: Waxmann.
(2007)