The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Fuzzy connected filters were recently introduced as an extension of connected filters within the fuzzy set framework. They rely on the representation of the image gray levels by fuzzy quantities, which are suitable to represent imprecision usually contained in images. No robust construction method of these fuzzy images has been introduced so far. In this paper we propose a generic method to fuzzify...
The success of a public key infrastructure such as the Web of trust (WoT) heavily depends on its ability to ensure that public keys are used by their legitimate owners, thereby avoiding malicious impersonations. To guarantee this property, the WoT requires users to physically gather, check each otherpsilas credentials (e.g., ID cards), to sign the trusted keys, and to subsequently monitor their validity...
Metallic nanostructures with controllable dimension and high aspect ratio provide an interesting alternative to carbon nanotubes for triode applications which require highly efficient and homogeneous field emission cathodes. Noble metal nanowires (NW) were electrochemically synthesized into the randomly distributed cylindrical pores of polycarbonate templates fabricated by GeV-ion irradiation, selective...
Oil-filled transformer explosions are caused by low impedance faults that result in arcing in transformer tanks once the oil loses its dielectric properties These arcs generate dynamic pressure waves which interact with the structure walls as they propagate throughout the transformer, raising static pressure and ultimately resulting in tank ruptures and possible fire. A simulation tool has been developed...
Intelligent driver assistance systems, such as lane departure warning, extract 3D information of the road geometry from a camera. Therefore, the transformation between the image and the ground plane has to be determined with a very high accuracy. Conventional calibration methods are usually a compromise between the accuracy and a preferably small effort for the calibration set-up. In this paper, we...
Oil filled transformer explosions and their prevention are a complex industrial issue. Experimental tests showed that when an electrical fault occurs in a transformer, it generates dynamic pressure waves that propagate in the oil. Reflections of these waves on the walls build up high static pressure which transformer tanks can not withstand. Besides, a numerical tool was developed to simulate the...
In this paper we propose a fast method to detect spiculated lesions and architectural distortions in digital breast tomosynthesis datasets. This approach relies on an a contrario modeling of the problem. First, an indicator corresponding to the convergence of structures is defined, then the a contrario framework is used to set a threshold on it in order to detect zones where its value is unlikely...
In this work, device reliability under DC- and RF-operation at high temperatures ranging from 140degC to 200degC and at high drain voltage of 50 V has been achieved by improving the gate metal processing technology. It will be shown by long term stress tests that the gate processing technology is the key to improve the stability of the gate leakage current. The short term drain voltage robustness...
In this paper a programmable Forward Error Correction (FEC) IP for a DVB-S2 receiver is presented. It is composed of a Low-Density Parity Check (LDPC), a Bose-Chaudhuri-Hoquenghem (BCH) decoder, and pre- and postprocessing units. Special emphasis is put on LDPC decoding, since it accounts for the most complexity of the IP core by far. We propose a highly efficient LDPC decoder which applies Gauss-Seidel...
In recent years, there was much activity in the development of camera based active safety systems to aid and to support the driver of a car. One application for such a system is the detection and classification of traffic signs. An important aspect of such a system is the tracking of traffic signs. We present a novel algorithm to track traffic signs in 3D using a single monochrome camera. The algorithm...
During the analysis of microscopy images, researchers locate regions of interest (ROI) and extract relevant information within it. Identifying the ROI is mostly done manually and subjectively by pathologists. Computer algorithms could help in reducing their workload and improve reproducibility. In particular, we want to assess the validity of the folic acid receptor as a biomarker for head and neck...
Excellent reliability performance of AlGaN/GaN HEMTs on SiC substrates for next generation mobile communication systems has been demonstrated using DC and RF stress tests on 8x60 μm wide and 0.5 μm long AlGaN/GaN HEMTs at a drain voltage of Vd=50V. Drain current recovery measurements after stress indicate that the degradation is partly caused by slow traps generated in the SiN passivation or in the...
At present the general shape based detection of traffic signs is an unsolved problem. Approaches that exist either concentrate on a particular shape (e.g. Hough transform for circles) or suffer from a high computational demand (see e.g. [1]). This paper presents a time efficient approach that can be used to detect traffic signs with a shape that can be described as a regular polygon or a circle. The...
As a result of the strong competition on the world car market the development cycles are decreasing while the complexity of todaypsilas E/E vehicle architectures is growing. This requires the introduction of new methods to speed up the development process and guarantee correct functionality of the deployed Electronic Control Units (ECUs). Especially, in the context of the diagnostic functionality...
In this paper a physically accurate real time cable simulation is presented and validated. The simulation method is fully integrated in virtual reality, which increases the usability and the sense for physical realism. The influence of pre-deformation, non-homogeneous cross sections and different taping of the bundles will be analyzed and compared to the simulation. The simulation is validated with...
Correctly identifying people who are interested in an interaction with a mobile robot is an essential task for a smart Human-Robot Interaction. In this paper an approach is presented for selecting suitable trajectory features in a task specific manner from a huge amount of different forms of possible representations. Different sub-sampling techniques are proposed to generate trajectory sequences from...
Simulating the distribution of light in virtual environments to generate photorealistic images has become increasingly important for numerous applications in the field of computer graphics. Nevertheless, the off-line rendering of special effects for the film industry or visualizations for education, architecture, and engineering quite often takes minutes or even hours for a single frame. Especially...
Transformer explosions are caused by electrical arcs occurring in the insulating oil. They generate dynamic pressure waves that propagate in the tank and interact with its structure leading to its explosion. This whole process was studied using experiments performed on large scale transformers. Moreover, to accurately study the phenomena exhibited during this experimental campaign and in order to...
The deposition of chromium and cobalt on TiO2 substrates is analyzed in a comparative study using synchrotron based photoelectron spectroscopy methods. Upon deposition of chromium the electronic structure of the TiO2 substrate is modified. The substrate is reduced while the deposited Cr becomes oxidized. Two states are observed to appear within the electronic gap and their distinct character of either...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.