TY - CHAP A1 - Alhwarin, Faraj A1 - Ferrein, Alexander A1 - Scholl, Ingrid T1 - IR stereo kinect: improving depth images by combining structured light with IR stereo T2 - PRICAI 2014: Trends in artificial intelligence : 13th Pacific Rim International Conference on Artificial Intelligence : Gold Coast, QLD, Australia, December 1-5, 2014 : proceedings. (Lecture notes in computer science ; vol. 8862) N2 - RGB-D sensors such as the Microsoft Kinect or the Asus Xtion are inexpensive 3D sensors. A depth image is computed by calculating the distortion of a known infrared light (IR) pattern which is projected into the scene. While these sensors are great devices they have some limitations. The distance they can measure is limited and they suffer from reflection problems on transparent, shiny, or very matte and absorbing objects. If more than one RGB-D camera is used the IR patterns interfere with each other. This results in a massive loss of depth information. In this paper, we present a simple and powerful method to overcome these problems. We propose a stereo RGB-D camera system which uses the pros of RGB-D cameras and combine them with the pros of stereo camera systems. The idea is to utilize the IR images of each two sensors as a stereo pair to generate a depth map. The IR patterns emitted by IR projectors are exploited here to enhance the dense stereo matching even if the observed objects or surfaces are texture-less or transparent. The resulting disparity map is then fused with the depth map offered by the RGB-D sensor to fill the regions and the holes that appear because of interference, or due to transparent or reflective objects. Our results show that the density of depth information is increased especially for transparent, shiny or matte objects. Y1 - 2014 SN - 978-3-319-13559-5 (Print) ; 978-3-319-13560-1 (E-Book) U6 - https://doi.org/10.1007/978-3-319-13560-1_33 SP - 409 EP - 421 PB - Springer CY - München ER - TY - CHAP A1 - Neumann, Tobias A1 - Ferrein, Alexander A1 - Kallweit, Stephan A1 - Scholl, Ingrid T1 - Towards a mobile mapping robot for underground mines T2 - 7th Conference of Robotics and Mechatronics : RobMech 2014 : 27th and 28th Nov. 2014, Cape Town Y1 - 2014 SP - 1 EP - 6 ER - TY - JOUR A1 - Bragard, Michael A1 - Richter, S. A. T1 - LED-Kreisel als Praxis-Booster JF - Elektor : electronics worldwide Y1 - 2008 SN - 0932-5468 VL - 39 IS - 12 SP - 16 ER - TY - CHAP A1 - Bragard, Michael A1 - Köllensperger, P. A1 - De Doncker, R. W. ED - Dmowski, Antoni T1 - Der Internally Commutated Thyristor (ICT) : ein neuartiger GCT mit integrierter Ausschalteinheit T2 - "Nowoczesne urządzenia zasilające w energetyce" : X międzynarodowa konferencja naukowo techniczna, Zakopane, 14-16 marca 2007 r. : materiały konferencyjne Y1 - 2007 SN - 83-918709-7-9 SP - 7.1 EP - 7.9 PB - APS Energia CY - Warszawa ER - TY - PAT A1 - Bragard, Michael A1 - Budde, W. O. A1 - Hente, D. A1 - Jacobs, J. H. A. M. A1 - Waffenschmidt, E. T1 - Lighting system : [patent of invention] T1 - Beleuchtungssystem : [Patentschrift] Y1 - 2008 N1 - Außerdem veröffentlicht als: TW200817630 (A), TWI402458 (B), RU2009106047 (A), RU2440636 (C2), KR20090042806 (A), KR101423467 (B1), JP2009545103 (A), JP5265540 (B2), CN101490772 (A) und CN101490772 (B) PB - WIPO / United States Patent and Trademark Office CY - Geneva / Alexandria, VA ER - TY - PAT A1 - Bragard, Michael A1 - De Doncker, R. W. A1 - Mura, F A1 - Dick, C. T1 - Halbleiterbauelement und Verfahren zur Herstellung desselben [Offenlegungsschrift] T1 - Semiconductor element and method producing the same [patent application] Y1 - 2011 PB - Deutsches Patent- und Markenamt / Europäisches Patentamt / WIPO CY - München / Den Hague / Geneva ER - TY - PAT A1 - Nötzold, K. A1 - Bragard, Michael A1 - Fink, K. A1 - Griessel, R. A1 - Wegener, R. T1 - Cascaded H-bridge converter with transformer based cell power balancing in each voltage level : [Patentschrift] Y1 - 2014 N1 - Titel des US-Patents: Bypassed cascaded cell converter : [patent of invention]. - Außerdem veröffentlicht als CN103997231 (A) PB - Europäisches Patentamt / United States Patent and Trademark Office [u.a.] CY - Den Haag / Alexandria, VA ER - TY - THES A1 - Bragard, Michael T1 - The integrated emitter turn-off thyristor : an innovative MOS-gated high-power device. - (Aachener Beiträge des ISEA ; 62) N2 - This thesis introduces the Integrated Emitter Turn-Off (IETO) Thyristor as a new high-power device. Known state-of-the-art research activities like the Dual GCT, the ETO thyristor and the ICT were presented and critically reviewed. A comparison with commercialized solutions identifies the pros and cons of each type of device family. Based on this analysis, the IETO structure is proposed, covering most benefits of each device class. In particular the combination of a MOS-assisted turn-off with a thyristor-based device allows a voltage-controlled MOS switching and the low on-state voltage of the thyristors. The following synthesis of an IETO device stands on a three-dimensional field of optimization spanned by electric, mechanical and thermal aspects. From an electric point of view, the lowest possible parasitic inductance and resistance within the commutation path are optimization criteria. The mechanical construction has to withstand the required contact pressure of multiple kilo Newtons. Finally, thermal borders limit the maximum average current of the device. FEM simulations covering these three aspects are performed for several design proposals. An IETO prototype is constructed and measurements on various test benches attest thermal, mechanical and electric performance. A local decoupling of the external driver stage and the presspack housing is presented by a cable connection. This separation enables a thermal and mechanical independence, which is advantageous in terms of vibrations and thermal cycles including increased reliability. The electric pulse performance of the prototype device is a factor of 3.1 above today''s solutions. In single-pulse measurements, a current up to 1600 A was successfully turned off at 115°C with an active silicon area of 823 mm². One reason for this increased turn-off capability is the extremely low-inductive construction. Additional functionality of the IETO thyristor like over-current self-protection and defined short-circuit failure state are successfully verified. Y1 - 2012 SN - 978-3-8440-1152-4 N1 - Zugl.: Aachen, Techn. Hochsch., Diss., 2012 PB - Shaker CY - Aachen ER - TY - JOUR A1 - Bragard, Michael A1 - Bragard, G. T1 - Erweiterungen für das CBL2-Messinterface von Texas-Instruments JF - Der mathematische und naturwissenschaftliche Unterricht : MNU ; Organ des Deutschen Vereins zur Förderung des Mathematischen und Naturwissenschaftlichen Unterrichts e.V. N2 - Das von Texas-Instruments (TI) vertriebene Interface CBL2 wird über einige TI-Grafik-Rechner (TI-92, TI-89 usw.) angesteuert. Wegen seiner Handlichkeit wird dieses System beim Unterricht in wechselnden Räumen »großen« Messwerterfassungssystemen oft vorgezogen. Das CBL2 bietet drei analoge Eingänge, die immerhin mit 10 Bit Auflösung und bis zu einer Frequenz von 50 kHz arbeiten. Weiterhin besitzt das CBL2 eine Buchse für angeblich nur einen digitalen Ein- bzw. Ausgang. An diesem Eingang wird standardmäßig hauptsächlich der Bewegungssensor CBR betrieben. In diesem Beitrag werden Erweiterungsmöglichkeiten dieses Anschlusses beschrieben. Y1 - 2003 SN - 0025-5866 N1 - Zugang nur für MNU-Mitglieder! VL - 56 IS - 2 SP - 87 EP - 88 PB - Seeberger CY - Neuss ER - TY - CHAP A1 - Schmiegel, A. A1 - Koch, K. A1 - Dittmer, M. A1 - Braun, M. A1 - Landau, M. A1 - Dick, C. A1 - Bragard, Michael A1 - [u.a.], T1 - Das Sol-ion System : ein System zur Optimierung des Eigenverbrauchs von PV-Strom T2 - Photovoltaische Solarenergie : 25. Symposium ; 03. - 05. März 2010, Kloster Banz, Bad Staffelstein. - (Wissen für Profis) Y1 - 2010 SN - 978-3-941785-23-6 SP - 354 EP - 359 PB - OTTI, Ostbayerisches Technologie-Transfer-Inst. CY - Regensburg ER -