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Nguyen Q.,German Research Center for Artificial Intelligence | Kipp M.,FH Augsburg
Conference on Human Factors in Computing Systems - Proceedings | Year: 2014

The translation and rotation of objects with two fingers is a well-explored multitouch technique. However, there are some unsolved questions regarding the optimal conditions under which this technique functions best. Does it matter in which direction the movement is oriented? Does parallel or sequential performance of the two operations work best? This study attempts to answer this question using a typical Fitts' Law setup but with varying translation-rotation orientation combinations. The results show that right-oriented movements were faster and easier than left-oriented ones. Movement combinations which went in different directions (translation right, rotation left, and vice versa) were found more tiresome and resulted in more strategy switches compared to equi-directional combinations. Our findings can inform positioning decisions in interaction design and contribute to theoretical adjustments to Fitts' Law.


Baeten A.,FH Augsburg
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2016

This paper focuses on an innovative modeling approach of the wave load estimation for a submerged structure in a continuous wave current. This approach is Lagrange-based providing finite particles, which represent discrete hydrodynamic properties in contrast to continuous hydrodynamics. It is implemented into a computationally efficient numerical multi-body simulation program, which is flexible in geometry and dynamic load spectrum. It features a particle-based liquid model and provides time accurate hydrodynamic pressure results in three dimensions and 6 Degrees-of-Freedom. Based on the results of dam break tests and sloshing analysis, unsteady impact loads are computed for a submerged structure of cylindrical shape. The wave current is modeled as a continuous flux of particles with velocity-based boundary conditions at the inlet and outlet. Thereby, the submerged structure geometry is flexible in terms of wall friction, elasticity laws and damping coefficients. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).


Schaeferling M.,FH Augsburg | Kiefer G.,FH Augsburg
Proceedings - 2010 International Conference on Reconfigurable Computing and FPGAs, ReConFig 2010 | Year: 2010

In this paper, we propose a novel architecture to accelerate the Speeded Up Robust Features (SURF) algorithm by the use of configurable hardware. SURF is used in optical tracking systems to robustly detect distinguishable features within an image in a scale and rotation invariant way. In its performance-critical part, SURF computes convolution filters at multiple scale levels without the need to create down-sampled versions of the original image. However, the algorithm exposes a very irregular memory access pattern. We designed a configurable and scalable architecture to overcome these memory access issues without the need to use any internal block RAM resources of the FPGA. The complete detector and descriptor stage of SURF has been implemented and validated in a Virtex 5 FPGA. © 2010 IEEE.


Baeten A.,FH Augsburg
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2015

This paper focuses on an innovative modeling approach for the energy dissipation during liquid-structure interaction for an impact on a multilayer material using a Lagrange-based particle-cluster method. This approach is based on a drop-test experiment, which is designed to capture the hydrodynamic forces on a rigid body undergoing accelerations relative to a liquid mass. It is implemented into a computationally efficient numerical multi-body simulation program, which is flexible in geometry and dynamic load spectrum. It features a particle-based liquid model and provides time accurate hydrodynamic pressure results in three dimensions and 6 Degrees-of-Freedom. Based on the results of the drop test experiment, the dissipated energy during liquid impact is computed for a cylindrical reference geometry. An experimental impact set-up analyzes the same material with respect to the structural response. Thereby, the reference body geometry is flexible in terms of wall friction, elasticity laws and damping coefficients. A special focus is set on the energy dissipation characteristics and the parameters that influence the degradation of the hydrodynamic forces during the impact. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE).


Baeten A.,FH Augsburg
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2010

This paper is Volume 2 of the ISOPE-2009 paper "Optimization of LNG tank shape in terms of sloshing impact pressure" and focuses on the sloshing parameter analysis. For this study a computationally efficient approach has been used, which is flexible in geometry and load spectrum. It provides time accurate wall pressure results in three dimensions and 6 Degrees-of-Freedom. Based on the results of specific test cases in volume 1 of this study, rectangular, cylindrical and spherical test tanks are discussed to optimize the tank shape in terms of impact pressure loading. Thereby, the LNG tank geometry has been varied in terms of curvature, steepness of the walls, and length-to-height ratio in order to minimize the LNG impact pressure on the tank. Cylindrical and spherical tank shapes have been analyzed in a multi-tank configuration undergoing forced oscillations in 6 Degrees-of-Freedom representing ocean waves. It has been found that in a multi-tank configuration, the spherical tanks help reducing the overall loads in a specific natural frequency domain when combined with corner-shaped tanks. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).


Horbach J.,FH Augsburg | Rammer C.,Center for European Economic Research | Rennings K.,Center for European Economic Research
Ecological Economics | Year: 2012

Empirical analyses of eco-innovation determinants have rarely been able to distinguish between different areas of environmental impact. The present paper tries to close this gap by employing a new and unique dataset based on the German Community Innovation Survey, conducted in 2009. The main purpose of this paper is to test whether different types of eco-innovation (according to their environmental impacts) are driven by different factors. Beside a complex set of different supply, firm-specific, and demand factors, the literature on determinants of eco-innovation accentuates the important role of regulation, cost savings and customer benefits. We find that current and expected government regulation is particularly important with regard to pushing firms to reduce air (e.g. CO 2, SO 2 or NO x) as well as water or noise emissions, avoid hazardous substances, and increase recyclability of products. Cost savings are an important motivation for reducing energy and material use, pointing to the role of energy and raw material prices as well as taxation as drivers for eco-innovation. Customer requirements are another important source of eco-innovations, particularly with regard to products with improved environmental performance and process innovations that increase material efficiency, and reduce energy consumption, waste and the use of dangerous substances. Firms confirm a high importance of expected future regulations for all environmental product innovations. © 2012 Elsevier B.V.


Horbach J.,FH Augsburg
Environmental Innovation and Societal Transitions | Year: 2016

The determinants of eco-innovation activities have been widely explored for single countries. However, there is a lack of analyses comparing different countries. The Community Innovation Survey (CIS 2008) allows for an analysis of the determinants of eco-innovation in 19 different European countries. This paper focuses on Eastern Europe as the determinants of eco-innovation have not yet been systematically analyzed for these countries. Concerning the introduction of eco-innovations, this analysis shows that regulation activities and environmentally related subsidies seem to be more important for the Eastern countries than they are for the "richer" Western European countries. Furthermore, the Eastern European countries rely more on competitors and external R&D as information sources, indicating a technology transfer from West to East. © 2015 Elsevier B.V. All rights reserved.


Horbach J.,FH Augsburg | Rennings K.,Center for European Economic Research
Journal of Cleaner Production | Year: 2013

The employment effects of environmental technologies are in the focus of politicians but studies analyzing these effects for different environmental innovation fields are rare. We use the 2009 wave of the Community Innovation Survey (CIS) allowing for such an analysis at the firm level. Our econometric analysis shows that innovative firms in general are characterized by a significantly more dynamic employment development. Especially the introduction of cleaner technologies as process innovations leads to a higher employment within the firm. The theoretical background of this finding is that cost savings induced by this type of process innovation improve the competitiveness of firms. This has positive effects on demand and thus also increases employment. Especially material and energy savings are positively correlated to employment because they help to increase the profitability and competitiveness of the firm. On the other side, air and water process innovations that are still dominated by end-of-pipe technologies have a negative impact on employment.


Schaeferling M.,FH Augsburg | Kiefer G.,FH Augsburg
Proceedings - 2011 International Conference on Reconfigurable Computing and FPGAs, ReConFig 2011 | Year: 2011

This paper describes a system for robust optical object recognition based on sophisticated point features which is completely implemented in a medium-size FPGA. All components needed to process image data are integrated in a System-on-Chip, including a special IP core which accelerates the feature detection step of the Speeded-up Robust Features (SURF) algorithm. The task of object recognition is solved by a lightweight matching algorithm. The system was evaluated with a set of 60 scene images. All 7 test objects were recognized at a sensitivity of 93% without any false positives at all. The minimum total execution time for one frame was 191ms, and the average time was 481ms. © 2011 IEEE.


Wolke A.,FH Augsburg | Meixner G.,FH Augsburg
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

Cloud computing is an emerging technology with a high impact on the operation and development of applications. Scalable web applications in particular can benefit from the advantages of Platform-as-a-Service solutions as they simplify development and maintenance. Unfortunately most of these offerings are a kind of one-way road as they lock the applications in the platform and vendor. This paper describes the TwoSpot platform we have developed to provide broader access to the advantages of Platform-as-a-Service and Infrastructure-as-a-Service functionalities by applying open and standards-based technologies. © 2010 Springer-Verlag.

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