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Cardoso J.M.P.,University of Porto | Diniz P.,University of Lisbon | Weinhardt M.,Osnabruck University of Applied Sciences
ACM Computing Surveys | Year: 2010

Reconfigurable computing platforms offer the promise of substantially accelerating computations through the concurrent nature of hardware structures and the ability of these architectures for hardware customization. Effectively programming such reconfigurable architectures, however, is an extremely cumbersome and error-prone process, as it requires programmers to assume the role of hardware designers while mastering hardware description languages, thus limiting the acceptance and dissemination of this promising technology. To address this problem, researchers have developed numerous approaches at both the programming languages as well as the compilation levels, to offer high-level programming abstractions that would allow programmers to easily map applications to reconfigurable architectures. This survey describes the major research efforts on compilation techniques for reconfigurable computing architectures. The survey focuses on efforts that map computations written in imperative programming languages to reconfigurable architectures and identifies the main compilation and synthesis techniques used in this mapping. ©2010 ACM.

von Piekartz H.,Osnabruck University of Applied Sciences | Ludtke K.,Institute of Systems Neurosciences
Cranio - Journal of Craniomandibular Practice | Year: 2011

The present study was comprised of 43 patients (16 men) with cervicogenic headaches for over three months, diagnosed according to the International Classification of Diagnostic Criteria of Headaches (ICDH-ll). The patients were randomly assigned to receive either manual therapy for the cervical region (usual care group) or additional manual therapy techniques to the temporomandibular region to additionally influence temporomandibular disorders (TMD). All patients were assessed prior to treatment, after six sessions of treatment, and at a six-month follow-up. The outcome criteria were: intensity of headaches measured on a colored analog scale, the Neck Disability Index (Dutch version), the Conti Anamnestic Questionnaire, noise registration at the mandibular joint using a stethoscope, the Graded Chronic Pain Status (Dutch version), mandibular deviation, range of mouth opening, and pressure/pain threshold of the masticatory muscles. The results indicate in the studied sample of cervicogenic headache patients, 44.1% had TMD. The group that received additional temporomandibular manual therapy techniques showed significantly decreased headache intensities and increased neck function after the treatment period. These improvements persisted during the treatment-free period (follow-up) and were not observed in the usual care group. This trend was also reflected on the questionnaires and the clinical temporomandibular signs. Based on these observations, we strongly believe that treatment of the temporomandibular region has beneficial effects for patients with cervicogenic headaches, even in the long-term. © 2011 by CHROMA, Inc.

Karnani F.,Osnabruck University of Applied Sciences | Karnani F.,Lüneburg University
Journal of Technology Transfer | Year: 2013

The assumption that research findings provide the basis for spin-off projects at universities has been found up to now in literature and the practice. Supported by the theory of knowledge, the empirical study presented here shows that this idea is too limited. Only 45 % of spin-offs use codified research findings from the university, while 55 % use tacit knowledge that was acquired at the university. These spin-offs use knowledge beyond research findings, starting companies in the shadow of publications by academic institutions and drawing from the realm of tacit knowledge at universities. Tacit start-up knowledge is present in all scientific disciplines of universities; even the exploitation- and patent-oriented engineering sciences account for almost half of the start-ups. Start-ups based on tacit knowledge lead to both technology-oriented and service companies. They also do not differ from codified knowledge-based start-ups in the number of jobs that they create. The discovery of the tacit knowledge spin-offs as a phenomenon has an entire series of implications for the practice and research. The tacit start-up potential was not considered previously in the university promotion instruments and start-up consultancies. Furthermore, we can assume that tacit knowledge-based start-ups are only an initial indication of the innovation potential within the tacit realm of knowledge for universities and research institutes. © 2012 Springer Science+Business Media, LLC.

Weinhardt M.,Osnabruck University of Applied Sciences
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

This paper reports on a color image enhancement algorithm implemented on a reconfigurable SoC of the Xilinx Zynq family. The algorithm consists of histogram equalization followed by an unsharp masking filter. A pure software implementation running on the Zynq’s ARM Core- A9 processor is compared to several hardware-accelerated versions with respect to the design effort and the quality-of-results. The accelerators are specified at register-transfer level, at high-level (C functions) and at system-level using the recently released Xilinx SDSoC tool. The latter approach is purely software-defined and generates all the interface code and circuitry automatically. Nevertheless, experience with high-level synthesis tools and a basic understanding of hardware coprocessor principles are also required in this approach to effectively use SDSoC. The results show that the same, significant speedup as with manual implementation can be reached for our application, but the resulting circuit tends to be larger with the higher-level design tools. © Springer International Publishing Switzerland 2016.

Flemming D.,Osnabruck University of Applied Sciences | Hubner U.,Osnabruck University of Applied Sciences
International Journal of Medical Informatics | Year: 2013

Introduction: Establishing continuity of care in handovers at changes of shift is a challenging endeavor that is jeopardized by time pressure and errors typically occurring during synchronous communication. Only if the outgoing and incoming persons manage to collaboratively build a common ground for the next steps of care is it possible to ensure a proper continuation. Electronic systems, in particular electronic patient record systems, are powerful providers of information but their actual use might threaten achieving a common understanding of the patient if they force clinicians to work asynchronously. In order to gain a deeper understanding of communication failures and how to overcome them, we performed a systematic review of the literature, aiming to answer the following four research questions: (1a) What are typical errors and (1b) their consequences in handovers? (2) How can they be overcome by conventional strategies and instruments? (3) electronic systems? (4) Are there any instruments to support collaborative grounding? Methods: We searched the databases MEDLINE, CINAHL, and COCHRANE for articles on handovers in general and in combination with the terms electronic record systems and grounding that covered the time period of January 2000 to May 2012. Results: The search led to 519 articles of which 60 were then finally included into the review. We found a sharp increase in the number of relevant studies starting with 2008. As could be documented by 20 studies that addressed communication errors, omission of detailed patient information including anticipatory guidance during handovers was the greatest problem. This deficiency could be partly overcome by structuring and systematizing the information, e.g. according to Situation, Background, Assessment and Recommendation schema (SBAR), and by employing electronic tools integrated in electronic records systems as 23 studies on conventional and 22 articles on electronic systems showed. Despite the increase in quantity and quality of the information achieved, it also became clear that there was still the unsolved problem of anticipatory guidance and presenting "the full story" of the patient. Only a small number of studies actually addressed how to establish common ground with the help of electronic tools. Discussion: The increase in studies manifests the rise of great interest in the handover scenario. Electronic patient record systems proved to be excellent information feeders to handover tools, but their role in collaborative grounding is unclear. Concepts of how to move to joint information processing and IT-enabled social interaction have to be implemented and tested. © 2013 Elsevier Ireland Ltd.

Schmitter E.D.,Osnabruck University of Applied Sciences
Annales Geophysicae | Year: 2010

The low frequency propagation conditions along the path from Iceland to Germany (52° N 8° E) using the NRK/TFK 37.5 kHz transmitter (63.9° N 22.5° W) prove as an easy to monitor and reliable proxy for north auroral activity. Signal processing using wavelet decomposition allows for quantitative activity level estimations. Calibration is based upon NOAA POES auroral activity data. Using an auroral oval model for the local intensity distribution of solar energetic particle precipitation and a wave propagation model ionospheric D-layer height decreases along the path can be derived. This in turn gives a hint to the low latitude extension and intensity of the auroral electrojet currents that can be responsible for communication and power systems failures. © 2010 Author(s).

Rokossa D.,Osnabruck University of Applied Sciences
IECON Proceedings (Industrial Electronics Conference) | Year: 2013

A new method has been developed in the Laboratory for Handling Technology and Robotics at the Hochschule Osnabrück that could significantly reduce the commissioning times for robot work cells. This is based on predefined functional modules, in which knowledge is stored about motion and process parameters from previously implemented robot applications. These modules, together with their knowledge elements (e.g. motion speeds, acceleration profiles or blending behavior) are made available within a database as a best-practice library for sub-sequent commissioning processes. A robot programmer can therefore refer to implemented knowledge and stored empirical values, saving the time-consuming optimization work. © 2013 IEEE.

Mertens T.,Airbus | Kollek H.,Osnabruck University of Applied Sciences
International Journal of Adhesion and Adhesives | Year: 2010

This paper discusses the stability and the adhesion properties of oxide layers after different surface treatments on Ti6Al4V. The surface treatments investigated consist of a three step procedure: a conditioning step (alkaline cleaning and acidic or alkaline etching) for cleaning and texturing the surface, a pre-treatment (sulphuric acid anodising) for adhesion promotion and a final painting. UV/vis-spectroscopy, XPS and SEM were used for the analysis of the resultant oxide layers. To evaluate the long-term stability of the oxide layers, different aging tests were carried out. The adhesion properties were determined by using the cross-cut test.The obtained oxide layers comprise TiO2 after the conditioning process. The aging applied to these surfaces causes an oxide layer growth. The oxide layers of the anodised samples contain titanium(II)oxide, titanium(III)oxides and titanium dioxide. In case of the applied conditions, the surface colours of the anodised samples are the result of the suboxides in the layer. The results show that the titanium(III)oxides are instable. Due to the aging test applied they were oxidised to titanium(IV)oxide. The found instabilities of the investigated oxide layers correspond to the paint adhesion results. The investigations show that the paint adhesion decreases due to the instability of the oxide layer. © 2010 Published Elsevier Ltd. All rights reserved.

Schmitter E.D.,Osnabruck University of Applied Sciences
Annales Geophysicae | Year: 2011

Very low and low radio frequency (VLF/LF) propagation responds sensitively to the electron density distribution in the lower ionosphere (upper mesosphere). Whereas propagation paths crossing subpolar and polar regions are frequently affected by forcing from above by particle precipitations, mid-and lowlatitude paths let forcing from below be more prominent. Our observations (2009-2011) show, that the low frequency propagation conditions along the midlatitude path from Sicily to Germany (52° N 8° E) using the NSY 45.9 kHz transmitter (37° N 14° E) prove to be a good proxy of mesosphere planetary wave activity along the propagation path. High absorption events with VLF/LF propagation correlate to the well known winter time D-layer anomaly observed with high frequency (HF) radio waves. VLF/LF propagation calculations are presented which show that the radio signal amplitude variations can be modeled by planetary wave modulated collison frequency and electron density profiles. The other way around wave pressure amplitudes can be inferred from the VLF/LF data. © 2006 Author(s).

Schmitter E.D.,Osnabruck University of Applied Sciences
Annales Geophysicae | Year: 2013

Remote sensing of the ionosphere bottom using long wave radio signal propagation is a still going strong and inexpensive method for continuous monitoring purposes. We present a propagation model describing the time development of solar flare effects. Based on monitored amplitude and phase data from VLF/LF transmitters gained at a mid-latitude site during the currently increasing solar cycle no. 24 a parameterized electron density profile is calculated as a function of time and fed into propagation calculations using the LWPC (Long Wave Propagation Capability). The model allows to include lower ionosphere recombination and attachment coefficients, as well as to identify the relevant forcing X-ray wavelength band, and is intended to be a small step forward to a better understanding of the solar-lower ionosphere interaction mechanisms within a consistent framework. © Author(s) 2013.

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