Hamburg University of Applied Sciences
Hamburg, Germany

The Hamburg University of Applied science is an institution of higher education and applied research located in Hamburg, Germany. Formerly known as Fachhochschule Hamburg the Hamburg University of Applied science was founded in 1970. In terms of student enrollment, the HAW is the second largest university in Hamburg, with a student body of 14,928 . Wikipedia.

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Petersen-Ewert C.,Hamburg University of Applied Sciences | Erhart M.,University of Hamburg | Ravens-Sieberer U.,University of Hamburg
Neuroscience and Biobehavioral Reviews | Year: 2011

Childhood health and illness have changed considerably over the past century calling for an increasing awareness of mental health problems. Consequently, the assessment of mental health problems is of major importance, not only focussing on mental health diagnoses but also on components of health-related quality of life (HRQOL) and functioning with regard to the impact of an illness or injury, medical treatment, or health care policy. Recently, a number of HRQOL measures for children and adolescents have been developed and applied in a number of studies. The current paper presents multi-cultural tools for the assessment of HRQOL, which were developed within European projects, describes the application of these tools in cross-national studies and pinpoints important determinants of HRQOL and mental health problems. Future research needs are discussed. © 2011 Elsevier Ltd.

Wolf K.,Hamburg University of Applied Sciences
Conference on Human Factors in Computing Systems - Proceedings | Year: 2017

Artist Pointer is critically questioning the role of the artist in a process of exhibiting digital art, no matter if being a piece of software or if the work became physical through digital manufacturing, like 3D printing, 3D milling or laser-cutting. Artist Pointer, like any digital art, has a digital DNA, no matter if it exists as software only or if it becomes physical in an exhibition through digital manufacturing. Therefore, digital art can be downloaded and exhibited everywhere and by everybody who has internet access and theoretically even without the artist's involvement. That enables to easily clone the work without referring to its creator. This is fundamentally different to analogue art, where usually an autograph is indicating the creator of an art work. With Artist Pointer I am questioning the artist's visibility in digital arts. Artist Pointer is a location sensitive replacement of the artist's autograph as it will - where ever the exhibition is and I (the artist) am - always point at me. Copyright © 2017 by the Association for Computing Machinery, Inc. (ACM).

Padberg J.,Hamburg University of Applied Sciences
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

Concepts for structuring are fundamental to any modelling technique. Hierarchical graphs allow vertical structuring, where nodes or edges contain other nodes or subgraphs. There have been several suggestions to hierarchical graphs that differ in terms of the underlying graph type, the elements that are structured and the way the structuring is achieved. In this contribution we aim at a more general notion of hierarchical structures for graphs. We investigate several extensions of the powersets that comprise arbitrarily nested subsets, and call them superpower set. This allows the definition of graphs with possibly infinitely nested nodes. Additionally, we allow edges that are incident to edges. Coalgebras and comma categories are used to capture different notions of hierarchies. The main motivation of this paper is the question how to define recursion on a graph’s structure so that we still obtain an M-adhesive transformation system. © Springer International Publishing AG 2017.

Kohler-Bussmeier M.,Hamburg University of Applied Sciences
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

Adaptivity plays a major role in the context of cyber physical systems (among them sensor networks, mobile adhoc networks, etc.), also known as the internet of things. Since the interaction of sensors and actors as well as their evolution plays a major role in this context, we concentrate on protocols and their adaption in this paper. Whenever we adapt protocols we typically have to modify more than one part of the interaction, i.e. adaptation becomes a distributed activity. As Petri nets are an established means to formalise distributed activities, we have chosen them for adaption-protocols as well. Since our adaption-protocol nets operate on protocol nets, we obtain a recursive structure as manifested in the nets-within-netsparadigm proposed by Rudiger Valk. In this paper we study self-adaptive systems in the formalism of Hornets. Hornets are algebraic Petri nets that have nets as tokens. In previous work we have shown that the reachability problem for safe elementary Hornets requires at least exponential space. To obtain a complexity that is feasible for run-time verification we study structural restrictions of elementary Hornets. It turns out that reachability is in PSpace again for the class of so called fan-bounded Hornets, where the number of places in the pre- and postset is used as a parameter. This class includes – among others – the well known class of State Machines. © Springer International Publishing AG 2017.

Behnert C.,Hamburg University of Applied Sciences
Journal of Documentation | Year: 2017

Purpose: The purpose of this paper is to demonstrate how to apply traditional information retrieval (IR) evaluation methods based on standards from the Text REtrieval Conference and web search evaluation to all types of modern library information systems (LISs) including online public access catalogues, discovery systems, and digital libraries that provide web search features to gather information from heterogeneous sources. Design/methodology/approach: The authors apply conventional procedures from IR evaluation to the LIS context considering the specific characteristics of modern library materials. Findings: The authors introduce a framework consisting of five parts: search queries, search results, assessors, testing, and data analysis. The authors show how to deal with comparability problems resulting from diverse document types, e.g., electronic articles vs printed monographs and what issues need to be considered for retrieval tests in the library context. Practical implications: The framework can be used as a guideline for conducting retrieval effectiveness studies in the library context. Originality/value: Although a considerable amount of research has been done on IR evaluation, and standards for conducting retrieval effectiveness studies do exist, to the authors’ knowledge this is the first attempt to provide a systematic framework for evaluating the retrieval effectiveness of twenty-first-century LISs. The authors demonstrate which issues must be considered and what decisions must be made by researchers prior to a retrieval test. © 2017, © Emerald Publishing Limited.

Fenner P.,Hamburg University of Applied Sciences
Current Opinion in Psychiatry | Year: 2017

PURPOSE OF REVIEW: Arts therapies are still inadequately regulated throughout the world despite a 100-year-long tradition, a vast number of academically trained therapists and importance in treating psychiatric patients. It is essential that more evidence-based studies are undertaken. RECENT FINDINGS: Current international guidelines focus on the efficacy and effectiveness of arts therapies. New international evidence-based studies reporting clear-cut therapeutic effects of art therapy, music therapy and dance movement therapy are described here, with a focus on developments in Australia, Egypt and the United States. SUMMARY: Further effort must be put into the development of evidence-based treatment programmes for all arts therapies, and effort needs to go into the establishment of arts therapists as a profession, with appropriate training standards. Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.

Lewandowski D.,Hamburg University of Applied Sciences
Aslib Proceedings: New Information Perspectives | Year: 2011

Purpose: The purpose of this paper is to test major web search engines on their performance on navigational queries, i.e. searches for homepages. Design/methodology/approach: In total, 100 user queries are posed to six search engines (Google, Yahoo!, MSN, Ask, Seekport, and Exalead). Users described the desired pages, and the results position of these was recorded. Measured success and mean reciprocal rank are calculated. Findings: The performance of the major search engines Google, Yahoo!, and MSN was found to be the best, with around 90 per cent of queries answered correctly. Ask and Exalead performed worse but received good scores as well. Research limitations/implications: All queries were in German, and the German-language interfaces of the search engines were used. Therefore, the results are only valid for German queries. Practical implications: When designing a search engine to compete with the major search engines, care should be taken on the performance on navigational queries. Users can be influenced easily in their quality ratings of search engines based on this performance. Originality/value: This study systematically compares the major search engines on navigational queries and compares the findings with studies on the retrieval effectiveness of the engines on informational queries. © Emerald Group Publishing Limited.

Winkler W.,Hamburg University of Applied Sciences
Applied Energy | Year: 2011

The necessary reduction of the human footprint demanded by Sustainable Development can be measured by the entropy flow of the society to the environment. The classic tools of process evaluation as e.g. exergetic or life cycle analysis are able to evaluate existing solutions. But their use during the design phase is quite limited because of lacking information about the system and its components. They may be helpful for evolutionary development strategies on a long term only. But reversible process structures can be used as benchmarks already in the conceptual design phase to introduce the demands of the second law. It can be shown that basic human demands on housing, mobility, communication, and infrastructure and industry can be principally supplied by reversible process structures. Because the process logic is a virtual one, real processes can be engineered with a reversible structure however its components produce irreversible entropy flows. Hybrid cars are the most common examples here. The use of exergetic efficiencies allows a transfer of the results of reversible structures to real technology easily. The here presented methodology of sustainable engineering can be summarized by three design rules as using reversible structures, considering technology by exergetic efficiencies, and minimizing components' entropy export. The still increasing utilization of electricity in upcoming technologies is very helpful for introducing reversible structures within hybrid technologies. © 2011 Elsevier Ltd.

Biallas G.,Hamburg University of Applied Sciences
International Journal of Fatigue | Year: 2013

Fatigue crack growth thresholds ΔKth were determined for friction stir welded butt joints made from aluminium alloys AA2024 and AA6013. Plotting the thresholds as a function of load ratio R showed distinctly higher amounts for welded joints as compared to those for parent material at small load ratios, but differences became smaller with increasing load ratio, until thresholds became finally identical for the highest R values. Applying Döker's concept of two controlling parameters, namely ΔK and K max [1], and plotting ΔKth versus Kmax, however, revealed that the effective threshold ΔKth ,eff determined at very high R ratios was nearly independent on the alloy and, simultaneously, was identical for parent material and respective welded joints. Thus, differences in threshold behaviour were only caused by the second threshold Kmax,th, which was significantly higher for welded joints as compared to parent material. Differences in Kmax,th coincided with compressive residual stresses determined by cut-compliance measurements in terms of stress intensity factors Krs acting at the crack tip. Based on the analytical approach described by Döker [1], only one characteristic Krs value was needed to calculate all thresholds of welded joints for 0 ≤ R ≤ 1 provided a base material master curve is available. © 2012 Elsevier Ltd. All rights reserved.

Hamburg University of Applied Sciences | Date: 2011-03-03

The invention relates to a method for thermochemically converting organic waste material having high molecular weight into liquid combustible materials and fuels, comprising the following steps: feeding organic waste material into a reactor, heating the organic waste material to a temperature between 250 C. and 500 C. while avoiding exceeding critical coking temperatures in the reactor, feeding biogenic substances to the reactor, collecting and condensing the gases and vapors released from the mixture of organic waste material and biogenic substances, collecting the condensate and letting phases form, and removing the phase(s) containing liquid combustible materials and fuels.

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