Refine
Department, Institute
- Institut für funktionale Gen-Analytik (IFGA) (291)
- Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE) (3)
- Fachbereich Elektrotechnik, Maschinenbau, Technikjournalismus (2)
- Fachbereich Informatik (2)
- Centrum für Entrepreneurship, Innovation und Mittelstand (CENTIM) (1)
- Fachbereich Angewandte Naturwissenschaften (1)
- Institut für Soziale Innovationen (ISI) (1)
- Institute of Visual Computing (IVC) (1)
- Internationales Zentrum für Nachhaltige Entwicklung (IZNE) (1)
Document Type
- Article (528)
- Conference Object (451)
- Part of a Book (218)
- Book (71)
- Report (46)
- Lecture (41)
- Patent (26)
- Contribution to a Periodical (25)
- Doctoral Thesis (16)
- Master's Thesis (8)
Year of publication
Language
- English (814)
- German (629)
- Multiple languages (10)
- French (1)
Is part of the Bibliography
- no (1454) (remove)
Keywords
- Sozialversicherung (9)
- Deutschland (7)
- Culture (6)
- E-Learning (6)
- Entwicklungspolitik (6)
- apoptosis (6)
- Ethik (5)
- OER (5)
- PPS (5)
- Aufsatzsammlung (4)
Further development on globally convergent algorithms for solution of stationary network problems is presented. The algorithms make use of global non-degeneracy of Jacobi matrix of the system, composed of Kirchhoff's flow conservation conditions and transport element equations. This property is achieved under certain monotonicity conditions on element equations and guarantees an existence of a unique solution of the problem as well as convergence to this solution from an arbitrary starting point. In application to gas transport networks, these algorithms are supported by a proper modeling of gas compressors, based on individually calibrated physical characteristics. This paper extends the modeling of compressors by hierarchical methods of topological reduction, combining the working diagrams for parallel and sequential connections of compressors. Estimations are also made for application of topological reduction methods beyond the compressor stations in generic network problems. Efficiency of the methods is tested by numerical experiments on realistic networks.
The formulation of transport network problems is represented as a translation between two domain specific languages: from a network description language, used by network simulation community, to a problem description language, understood by generic non-linear solvers. A universal algorithm for this translation is developed, an estimation of its computational complexity given, and an efficient application of the algorithm demonstrated on a number of realistic examples. Typically, for a large gas transport network with about 10K elements the translation and solution of non-linear system together require less than 1 sec on the common hardware. The translation procedure incorporates several preprocessing filters, in particular, topological cleaning filters, which accelerate the solution procedure by factor 8.
3D Time-of-Flight (ToF)
(2015)
3D Time-of-Flight (ToF)
(2012)
3D-Imaging
(2009)
Räumliches Wahrnehmen der Fahrerumgebung mit PMD-Sensorik in Assistenz- und Sicherheitssystemen
(2005)
3D time of flight distance measurement with custom solid state image sensors in CMOS, CCD technology
(2000)
Since we are living in a three-dimensional world, an adequate description of our environment for many applications includes the relative position and motion of the different objects in a scene. Nature has satisfied this need for spatial perception by providing most animals with at least two eyes. This stereo vision ability is the basis that allows the brain to calculate qualitative depth information of the observed scene. Another important parameter in the complex human depth perception is our experience and memory. Although it is far more difficult, a human being is even able to recognize depth information without stereo vision. For example, we can qualitatively deduce the 3D scene from most photos, assuming that the photos contain known objects [COR]. The acquisition, storage, processing and comparison of such a huge amount of information requires enormous computational power - with which nature fortunately provides us. Therefore, for a technical implementation, one should resort to other simpler measurement principles. Additionally, the qualitative distance estimates of such knowledge-based passive vision systems can be replaced by accurate range measurements.
Entfernungsmesssystem
(2019)
