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Kempen wird zum Reallabor
(2019)
Berechnungs- und Auslegungstool zur energieeffizienten Kühlung von Gebäuden (Coolplan). P5-28
(2014)
Net Zero-Energy Buildings (NZEBs) have received increased attention in recent years as a result of constant concerns for energy supply constraints, decreasing energy resources, increasing energy costs and rising impact of greenhouse gases on world climate. Promoting whole, building strategies that employ passive measures with energy efficient systems and technologies using renewable energy, became a European political strategy since the publication of the Energy Performance of Buildings Directive recast in May 2010 by the European Parliament and Council. Designing successful NZEBs however, represents a challenge since the definitions are yet generic assessment method and monitoring approach are under development and the literature is relatively scarce about the best sets of solutions for different typologies and climates likely to deliver an actual and reliable performance in terms of energy balance (consumed vs generated) on a cost-effective basis. Beside this, the lessons learned from already built NZEBs examples are relatively scarce. The authors of this paper, who are participants in the IEA SHC Task 40-ECBCS Annex 52, “Towards Net Zero Energy Solar Buildings”, are willing to share insights from on-going research work on some best practice leading NZEBs residential buildings. Although there is no standard approach for designing a Net Zero-Energy Building (there are many different possible combinations of passive and efficient active measures, utility equipment and on-site energy generation technologies able to achieve the net-zero energy performance), a close examination of the chosen strategies and the relative performance indicators of the selected case studies reveal that it is possible to achieve zero-energy performance using well known strategies adjusted accordingly to balance climate driven-demand for space heating/cooling, lighting, ventilation and others energy uses with climate-driven supply from renewable energy resources.
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
The PSFC, or Pioneer sound field control system, is a DSP-driven hemispherical 14-loudspeaker array, installed at the University of Aizu Multimedia Center. Collocated with a large screen rear-projection stereographic display the PSFC features realtime control of virtual room characteristics and direction of two separate sound channels, smoothly steering them around a configurable soundscape. The PSFC controls an entire sound field, including sound direction, virtual distance, and simulated environment (reverb level, room size and liveness) for each source. It can also configure a dry (DSP-less) switching matrix for direct directionalization. The PSFC speaker dome is about 14 m in diameter, allowing about twenty users at once to comfortably stand or sit near its sweet spot.
The PSFC, or Pioneer Sound Field Controller, is a DSP-driven hemispherical loudspeaker array, installed at the University of Aizu Multimedia Center. The PSFC features realtime manipulation of the primary components of sound spatialization for each of two audio sources located in a virtual environment, including the content (apparent direction and distance) and context (room characteristics: reverberation level, room size and liveness). In an alternate mode, it can also direct the destination of the two separate input signals across 14 loudspeakers, manipulating the direction of the virtual sound sources with no control over apparent distance other than that afforded by source loudness (including no simulated environmental reflections or reverberation). The PSFC speaker dome is about 10 m in diameter, accommodating about fifty simultaneous users, including about twenty users comfortably standing or sitting near its ``sweet spot,'' the area in which the illusions of sound spatialization are most vivid. Collocated with a large screen rear-projection stereographic display, the PSFC is intended for advanced multimedia and virtual reality applications.
Cu–Co-based model catalysts were prepared by a sophisticated alkali-free synthesis method and tested in the conversion of synthesis gas to higher alcohols. MoO3-coated alumina was used as the support, providing both high specific surface area and strongly interacting sites for the deposition of the active metals. A bulk Cu/Co ratio of ~2 was found to be most suitable in terms of activity and product distribution. Surface enrichment of Mo for all samples was observed by XPS, which significantly influenced the performance of the catalysts. Mo was found to be both a structural and a chemical promoter. Strong metal–support interactions were further achieved by modification of alumina with magnesia. With 12 wt% Mg incorporated, the catalysts showed 40% total oxygenate selectivity including 11% selectivity to ethanol.
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.
Efficient photoionisation, preparation and coherent manipulation of trapped /sup 171/Yb/sup +/-ions
(2005)
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.
An ISO 27001 compliant information security management system is difficult to create, due to the the limited support for system development and documentation provided in the standard. We present a structured analysis of the documentation and development requirements in the ISO 27001 standard. Moreover, we investigate to what extent existing security requirements engineering approaches fulfill these requirements. We developed relations between these approaches and the ISO 27001 standard using a conceptual framework originally developed for comparing security requirements engineering methods. The relations include comparisons of important terms, techniques, and documentation artifacts. In addition, we show practical applications of our results.
Considering legal aspects during software development is a challenging problem, due to the cross-disciplinary expertise required. The problem is even more complex for cloud computing systems, because of the international distribution, huge amounts of processed data, and a large number of stakeholders that own or process the data. Approaches exist to deal with parts of the problem, but they are isolated from each other. We present an integrated method for elicitation of legal requirements. A cloud computing online banking scenario illustrates the application of our methods. The running example deals with the problem of storing personal information in the cloud and based upon the BDSG (German Federal Data Protection Act). We describe the structure of the online banking cloud system using an existing pattern-based approach. The elicited information is further refined and processed into functional requirements for software development. Moreover, our method covers the analysis of security-relevant concepts such as assets and attackers particularly with regard to laws. The requirements artifacts then serve as inputs for existing patterns for the identification of laws relevant for the online banking cloud system. Finally, our method helps to systematically derive functional as well as security requirements that realize the previously identified laws.
The ISO 27000 is a well-established series of information security standards. The scope for applying these standards can be an organisation as a whole, single business processes or even an IT application or IT infrastructure. The context establishment and the asset identification are among the first steps to be performed. The quality of the results produced when performing these steps has a crucial influence on the subsequent steps such as identifying loss, vulnerabilities, possible attacks and defining countermeasures. Thus, a context analysis to gather all necessary information in the initial steps is important, but is not offered in the standard. In this paper, we focus on the scope of cloud computing systems and present a way to support the context establishment and the asset identification described in ISO 27005. A cloud system analysis pattern and different kinds of stakeholder templates serve to understand and describe a given cloud development problem, i.e. the envisaged IT systems and the relevant parts of the operational environment. We illustrate our support using an online banking cloud scenario.
Computational investigation of oxy-combustion of pulverized coal and biomass in a swirl burner
(2022)
Documents are supporting pillars of information and communication within and between companies. An electronically supported document management, which fulfils the company requirements, makes it possible to quickly and efficiently collect the required information objects and to reliably find them again. Document management serves as a core, from which the knowledge management of a company can be developed continuously.
The Chylla–Haase polymerization reactor is widely accepted as a benchmark process for the evaluation of control strategies for batch reactors. In this contribution a control concept based on Exact I/O-Linearization is proposed and compared to a conventional cascade control structure. In order to adapt the exact linearization control strategy to various polymerization products and batch conditions, an advanced probabilistic inference algorithm (Sigma-Point Kalman Filter) is applied and investigated. Sigma-Point Kalman Filters have the major improvement of simplified implementation compared to local linearization methods (i.e. Extended Kalman Filter) because no analytical Jacobians are required. Stochastic simulation studies are introduced and show the effectiveness, accuracy and benefit of the control concept. Within several scenarios a satisfying robustness against structural errors in the underlying model equations for the nonlinear control law and the inference algorithm is demonstrated. Furthermore it is pointed out, that with little effort in reassembling the plant design, control performance can be improved significantly.