Hochschule fur Technik und Wirtschaft

Berlin, Germany

Hochschule fur Technik und Wirtschaft

Berlin, Germany
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PubMed | University of Michigan, Hochschule fur Technik und Wirtschaft, Hackensack University Medical Center, University of Maine, United States and 3 more.
Type: | Journal: BioMed research international | Year: 2016

Cognitive decline impacts older adults, particularly their independence. The goal of this project was to increase understanding of how short-term, everyday lifestyle options, including physical activity, help an older adult sustain cognitive independence. Using a secondary analysis of lifestyle choices, we drew on a dataset of 4,620 community-dwelling elders in the US, assessed at baseline and one year later using 2 valid and reliable tools, the interRAI Community Health Assessment and the interRAI Wellness tool. Decline or no decline on the Cognitive Performance Scale was the dependent variable. We examined sustaining ones status on this measure over a one-year period in relation to key dimensions of wellness through intellectual, physical, emotional, social, and spiritual variables. Engaging in physical activity, formal exercise, and specific recreational activities had a favorable effect on short-term cognitive decline. Involvement with computers, crossword puzzles, handicrafts, and formal education courses also were protective factors. The physical and intellectual domains of wellness are prominent aspects in protection from cognitive decline. Inherent in these two domains are mutable factors suitable for targeted efforts to promote older adult health and well-being.

Volkov V.,Saint Petersburg State University | Germer R.,Hochschule fur Technik und Wirtschaft
Proceedings of the 2010 International Conference on Image Processing, Computer Vision, and Pattern Recognition, IPCV 2010 | Year: 2010

The paper describes a novel method of localizing line segments and estimating their start and end points. The lines are ordered within the image by detecting the orientation of straight edges. Image processing structure is considered which includes directional gradient processing for obtaining straight lines from edges and filtering of lines with the prescribed line slope. It permits to order lines of this slope according to their gradient values and their lengths. Extraction of a gradient line profile is used for start and end points estimation by thresholding. The problem considered is related to reduction of an original grey-level image to a set of geometric edge position parameters. This set may be used for construction primary features for image understanding and storing. It is also useful for a comparison of different images of the same scene and for finding the mutual points for images matching.

Brunner M.,Bern University of Applied Sciences | Lehmann M.,Bern University of Applied Sciences | Kraft S.,Bern University of Applied Sciences | Fankhauser U.,Empa Wood Laboratory | And 2 more authors.
Journal of Adhesion Science and Technology | Year: 2010

Glulam is manufactured by gluing graded timber boards on top of each other with standard, stiff adhesives to form a beam. The research presented here is concerned with the use of a single flexible adhesive layer at a certain position of the beam cross section instead of the standard, stiff adhesive. In a first step, fundamental theoretical considerations for a favourable redistribution of the stresses over the cross section of the beam are presented and the position of the flexible adhesive layer is optimized in order to obtain the highest bending resistance of the total beam. Further calculations help to determine the requisite mechanical properties of the adhesive layer. They are communicated to the adhesive manufacturer as target values for the development of new adhesives. The industrial partner was able to produce several adhesive layers with the required mechanical properties. There was a need to select a limited number of the adhesive layers for further tests. The selection was done based on creep and delamination tests. Finally, several beams were manufactured with three selected adhesive layers. Bending tests were carried out to verify the theoretical predictions. The beams manufactured with two of the selected adhesives did not perform well on the large scale as compared to the small scale tests. One of the adhesive layers, however, gave completely satisfactory results: The beams manufactured with this adhesive layer exhibited much higher strength than the control beams and thus confirmed the theoretical expectations. The authors envision a new strengthening technique for glulam beams with this simple technique of using a single, flexible adhesive layer in the beam cross section. © Koninklijke Brill NV, Leiden, 2010.

Braun M.,Hochschule fur Technik und Wirtschaft | Leiner U.,Heinrich Hertz Institute | Ruschin D.,Heinrich Hertz Institute
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

The perception of space in the real world is based on multifaceted depth cues, most of them monocular, some binocular. Developing 3D-displays raises the question, which of these depth cues are predominant and should be simulated by computational means in such a panel. Beyond the cues based on image content, such as shadows or patterns, Stereopsis and depth from motion parallax are the most significant mechanisms supporting observers with depth information. We set up a carefully designed test situation, widely excluding undesired other distance hints. Thereafter we conducted a user test to find out, which of these two depth cues is more relevant and whether a combination of both would increase accuracy in a depth estimation task. The trials were conducting utilizing our autostereoscopic "Free2C"-displays, which are capable to detect the user eye position and steer the image lobes dynamically into that direction. At the same time, eye position was used to update the virtual camera's location and thereby offering motion parallax to the observer. As far as we know, this was the first time that such a test has been conducted using an autosteresocopic display without any assistive technologies. Our results showed, in accordance with prior experiments, that both cues are effective, however Stereopsis is by order of magnitude more relevant. Combining both cues improved the precision of distance estimation by another 30-40%. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Franken-Wendelstorf R.,Hochschule fur Technik und Wirtschaft | Konrad M.,Hochschule fur Technik und Wirtschaft | Schuchardt A.,Hochschule fur Technik und Wirtschaft
Proceedings of the European Conference on Games-based Learning | Year: 2014

This paper introduces the Mobile Museum for schools and its novel interactive information systems that were developed at the Hochschule für Technik und Wirtschaft (HTW) Berlin together with the Jewish Museum Berlin (JMB) in the context of project "HardMut - Hardware and multimedia technology for the development of a mobile museum". These information systems make use of serious games and digital multimedia technology for knowledge transfer and to enhance the user experience. The aim was to make the visit of the mobile museum more attractive. Several applications and installations were created for this purpose, at which two of them will be described in more detail in this paper - the "Hat and Hair" installation and the "Interactive Diaries". The former is part of the Mobile Museum installations in which pupils can virtually "wear" different religious headdresses and inform themselves about these headpieces. The latter is a set of applications running on tablet computers which the pupils can explore during guided classroom workshops. These applications show a digital multimedia "diary" of different young Jews, in which their life, their habits and traditions are depicted by means of different media (pictures, text, audio, and video). Several games are included on the pages of the diary applications to interactively test the transferred knowledge, playfully depict certain facts, and attract the young audience. Basic technical background about the "Hat and Hair" installation and the "Interactive Diaries" is provided in the paper in terms of used hard- and software, frameworks, and algorithms. The paper concludes with the results of an evaluation that took part for two weeks. In those two weeks data about the general user acceptance of the installations and applications, the results for the achieved knowledge transfer, and usability issues was collected. This data was analysed and the results are depicted in the paper. © The Authors, 2014.

Conrad C.A.,Hochschule fur Technik und Wirtschaft
Wirtschaftsdienst | Year: 2015

This paper examines the effects of food and commodity speculation on the basis of the current state of research. Countless econometric studies have yet to either conclusively confirm or deny the influence of speculation on prices. However, the influence of futures prices on the spot market prices can be derived if the excess demand in the futures market is high and persists for an extended period of time. Regulation is therefore required. © 2015, ZBW and Springer-Verlag Berlin Heidelberg.

A novel process, for use on a production scale, is reported which allows the optimisation and analysis of ultra-thin interfacial properties of ultra-thin SiO2 to be controlled and characterised at an atomic level. These results provide a greatly improved insight into the correlation between conditions of preparation and the fundamentals of the process. This, in turn, allows optimisation of the Si/SiO2 interface, to meet increasingly demanding performance requirements. So widely used are nanotechnological assemblies, in line with increasing miniaturisation, that this technology is now virtually mandatory.

Greshake B.,Molecular Ecology Group | Greshake B.,Goethe University Frankfurt | Bayer P.E.,University of Queensland | Rausch H.,Hochschule fur Technik und Wirtschaft | Reda J.,Johannes Gutenberg University Mainz
PLoS ONE | Year: 2014

Genome-Wide Association Studies are widely used to correlate phenotypic traits with genetic variants. These studies usually compare the genetic variation between two groups to single out certain Single Nucleotide Polymorphisms (SNPs) that are linked to a phenotypic variation in one of the groups. However, it is necessary to have a large enough sample size to find statistically significant correlations. Direct-To-Consumer (DTC) genetic testing can supply additional data: DTC-companies offer the analysis of a large amount of SNPs for an individual at low cost without the need to consult a physician or geneticist. Over 100,000 people have already been genotyped through Direct-To-Consumer genetic testing companies. However, this data is not public for a variety of reasons and thus cannot be used in research. It seems reasonable to create a central open data repository for such data. Here we present the web platform openSNP, an open database which allows participants of Direct-To-Consumer genetic testing to publish their genetic data at no cost along with phenotypic information. Through this crowdsourced effort of collecting genetic and phenotypic information, openSNP has become a resource for a wide area of studies, including Genome-Wide Association Studies. openSNP is hosted at http://www.opensnp.org, and the code is released under MIT-license at http://github.com/gedankenstuecke/snpr. © 2014 Greshake et al.

Gremzow C.,TU Berlin | Menge M.,Hochschule fur Technik und Wirtschaft
Digest of Technical Papers - IEEE International Conference on Consumer Electronics | Year: 2014

An embedded system is normally adapted to a specific application and optimized for speed, power consumption and cost. In applications where power consumption and cost are important, embedded systems are typically very small. Because of the limited hardware resources of such a system it is normally not possible to utilize a real-time operating system - even though it would reduce development costs. This paper describes the inner principles of a real time operating system that is able to work with minimal resources and very effective power use. © 2014 IEEE.

Sagheby H.,TU Berlin | Kriegel M.,TU Berlin | Mueller B.,Hochschule fur Technik und Wirtschaft
10th International Conference on Healthy Buildings 2012 | Year: 2012

Dispersion of gaseous contaminants can often be modeled using Tracer Gases. In flows of high velocities the density of contaminants often plays a negligible role in predicting the distribution routes of emissions. Preliminary studies have shown, however, that in ventilation types such as displacement ventilation where low velocities exist, the density effects of contaminants cannot be considered anymore a minor parameter. Using a uniform low velocity upward flow, the results of this study aimed to find out the transition point where the density effects become the dominant factor. Non-dimensionalization was used in order to summarize the volume of experimental data. The results are shown in terms of concentration and a modified Archimedes number (Armod.) in which the density change is based on the mean concentration of the tracer gas in the flow. The results of this setup point out a particular range of Ar at which the inertial forces of the flow are not "strong" enough anymore to dominate density effects.

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