TY - GEN AU - N., N. ID - 46221 TI - Improving the End-of-Line Test of Custom-Built Geared Motors using Clustering based on Neural Networks ER - TY - JOUR AU - Demir, Caglar AU - Ngonga Ngomo, Axel-Cyrille ID - 46243 JF - ECML-PKDD TI - Clifford Embeddings – A Generalized Approach for Embedding in Normed Algebras ER - TY - JOUR AU - Demir, Caglar AU - Ngonga Ngomo, Axel-Cyrille ID - 46251 JF - International Joint Conference on Artificial Intelligence TI - Neuro-Symbolic Class Expression Learning ER - TY - JOUR AU - Ma, Yulai AU - Mattiolo, Davide AU - Steffen, Eckhard AU - Wolf, Isaak Hieronymus ID - 46256 IS - 3 JF - SIAM Journal on Discrete Mathematics KW - General Mathematics SN - 0895-4801 TI - Pairwise Disjoint Perfect Matchings in r-Edge-Connected r-Regular Graphs VL - 37 ER - TY - CONF AU - Meier, Jana AU - Vogelsang, Christoph AU - Küth, Simon AU - Scholl , Daniel AU - Watson, Christina AU - Seifert, Andreas ID - 46261 TI - Welche Rolle spielt eine reflexive Haltung für eine qualitätsvolle Unterrichtsreflexion? – Zusammenhänge zwischen einer quasi-experimentellen Einstellung und der Reflexionsperformanz von Lehramtsstudierenden [Einzelbeitrag]. ER - TY - CONF AU - Scholl, Daniel AU - Küth, Simon AU - Vogelsang, Christoph AU - Meier, Jana AU - Watson, Christina AU - Seifert, Andreas ID - 46262 TI - Das Unterrichtsplanungsprinzip der Interdependenz – Eine netzwerkanalytische Untersuchung der Begründungsstrukturen beim Planungsentscheiden [Einzelbeitrag]. ER - TY - CONF AU - Scholl, Daniel AU - Vogelsang, Christoph AU - Küth, Simon AU - Meier, Jana AU - Watson, Christina AU - Seifert, Andreas ID - 46263 TI - Eine reflexive Haltung als Grundlage einer hochwertigen Unterrichtsreflexion? Zusammenhänge zwischen einer quasi-experimentellen Einstellung zur Reflexion und der Reflexionsperformanz von Lehramtsstudierenden [Einzelbeitrag]. ER - TY - GEN ED - Meier, Jana ED - Küth, Simon ED - Scholl , Daniel ED - Vogelsang, Christoph ED - Watson, Christina ID - 46260 TI - Der Zyklus von Planung und Reflexion. Zusammenhänge zwischen der generischen Unterrichtsplanungsfähigkeit und der Reflexionskompetenz angehender Lehrkräfte. ER - TY - CONF AB - State-of-the-art LLC resonant converters use MOSFETs in their inverter stage, which allows high switching frequencies and thus the use of compact magnetic components. The large parasitic output capacitance and the poor reverse-recovery behaviour of the inherent body diode of high-voltage (600 V) silicon MOSFETs require soft switching, i.e. zero-voltage switching (ZVS). Otherwise, the high turn-on switching losses would lead to excessive heating and ultimately to the destruction of the switch. Therefore, MOSFET-based LLC converters are operated in the so-called inductive region only, which enables ZVS. The use of robust and cost-effective IGBTs instead of MOSFETs is particularly advantageous for automotive applications, since in addition to high reliability low costs are an important objective here. Since IGBTs are characterized by dominant turn-off losses and generally higher switching losses compared to MOSFETs, the aim is to operate them with zero-current switching (ZCS) and at low switching frequencies below the resonance frequency. In this region also the voltage transfer characteristic is steeper, which qualifies for applications with a strongly varying input-to-output voltage ratio, such as given for automotive on-board DC-DC converters connecting the (high-voltage) traction battery with the (12 V) auxiliary battery. In this paper, a stress value analysis based on a switched-model simulation is used to design a ZCS LLC converter and take advantage of the mentioned benefits of IGBTs as well as of the steeper voltage transfer characteristic. Within this operation region below the resonance frequency, however, a new phenomenon of several current pulses occurring during a single switching period through the rectifier components may appear. Generally, in applications with high output currents a synchronous rectifier (SR) is often used to keep the conduction losses of the rectifier stage at a moderate level: Low-voltage MOSFETs, which actively need to be gated synchronously to the polarity of the current pulses, are employed then instead of more lossy rectifier diodes. However, standard SR driver ICs have been shown to be unable to properly rectify the multi-pulse output currents of the proposed LLC operation, resulting in high conduction losses of the rectifier stage. A cost-effective hardware concept is presented which ensures proper rectification by using standard SR-ICs that are actively overdriven by the converter’s central microcontroller. A 2 kW prototype for an EV on-board DC-DC converter was built to show the effectiveness of the method, documenting an increase in efficiency by up to 4.1 % compared to a purely SR-IC-based solution. Overall efficiency is very similar to that of a conventional (MOSFET-based) LLC converter so that the ZCS-operated LLC IGBT-converter represents a cost-effective alternative, which even shows 10 % less worst-case losses. AU - Urbaneck, Daniel AU - Schafmeister, Frank AU - Böcker, Joachim ID - 46269 KW - LLC Converter KW - IGBT KW - ZCS KW - Synchronous Rectification T2 - PCIM Europe 2023 TI - Advanced Synchronous Rectification for an IGBT-Based ZCS LLC Converter with High Output Currents for a 2 kW Automotive DC-DC Stage ER - TY - CONF AB - The computation of electron repulsion integrals (ERIs) over Gaussian-type orbitals (GTOs) is a challenging problem in quantum-mechanics-based atomistic simulations. In practical simulations, several trillions of ERIs may have to be computed for every time step. In this work, we investigate FPGAs as accelerators for the ERI computation. We use template parameters, here within the Intel oneAPI tool flow, to create customized designs for 256 different ERI quartet classes, based on their orbitals. To maximize data reuse, all intermediates are buffered in FPGA on-chip memory with customized layout. The pre-calculation of intermediates also helps to overcome data dependencies caused by multi-dimensional recurrence relations. The involved loop structures are partially or even fully unrolled for high throughput of FPGA kernels. Furthermore, a lossy compression algorithm utilizing arbitrary bitwidth integers is integrated in the FPGA kernels. To our best knowledge, this is the first work on ERI computation on FPGAs that supports more than just the single most basic quartet class. Also, the integration of ERI computation and compression it a novelty that is not even covered by CPU or GPU libraries so far. Our evaluation shows that using 16-bit integer for the ERI compression, the fastest FPGA kernels exceed the performance of 10 GERIS ($10 \times 10^9$ ERIs per second) on one Intel Stratix 10 GX 2800 FPGA, with maximum absolute errors around $10^{-7}$ - $10^{-5}$ Hartree. The measured throughput can be accurately explained by a performance model. The FPGA kernels deployed on 2 FPGAs outperform similar computations using the widely used libint reference on a two-socket server with 40 Xeon Gold 6148 CPU cores of the same process technology by factors up to 6.0x and on a new two-socket server with 128 EPYC 7713 CPU cores by up to 1.9x. AU - Wu, Xin AU - Kenter, Tobias AU - Schade, Robert AU - Kühne, Thomas AU - Plessl, Christian ID - 43228 T2 - 2023 IEEE 31st Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM) TI - Computing and Compressing Electron Repulsion Integrals on FPGAs ER - TY - JOUR AB - The non-orthogonal local submatrix method applied to electronic structure–based molecular dynamics simulations is shown to exceed 1.1 EFLOP/s in FP16/FP32-mixed floating-point arithmetic when using 4400 NVIDIA A100 GPUs of the Perlmutter system. This is enabled by a modification of the original method that pushes the sustained fraction of the peak performance to about 80%. Example calculations are performed for SARS-CoV-2 spike proteins with up to 83 million atoms. AU - Schade, Robert AU - Kenter, Tobias AU - Elgabarty, Hossam AU - Lass, Michael AU - Kühne, Thomas AU - Plessl, Christian ID - 45361 JF - The International Journal of High Performance Computing Applications KW - Hardware and Architecture KW - Theoretical Computer Science KW - Software SN - 1094-3420 TI - Breaking the exascale barrier for the electronic structure problem in ab-initio molecular dynamics ER - TY - JOUR AB - Site-controlled Ga droplets on AlGaAs substrates are fabricated using area-selective deposition of Ga through apertures in a mask during molecular beam epitaxy (MBE). The Ga droplets can be crystallized into GaAs quantum dots using a crystallization step under As flux. In order to model the complex process, including the masked deposition of the droplets and a reduction of their number during a thermal annealing step, a multiscale kinetic Monte Carlo (mkMC) simulation of self-assembled Ga droplet formation on AlGaAs is expanded for area-selective deposition. The simulation has only two free model parameters: the activation energy for surface diffusion and the activation energy for thermal escape of adatoms from a droplet. Simulated droplet numbers within the opening of the aperture agree quantitatively with the experimental results down to the perfect site-control, with one droplet per aperture. However, the model parameters are different compared to those of the self-assembled droplet growth. We attribute this to the presence of the mask in close proximity to the surface, which modifies the local process temperature and the As background. This approach also explains the dependence of the model parameters on the size of the aperture. AU - Feddersen, Stefan AU - Zolatanosha, Viktoryia AU - Alshaikh, Ahmed AU - Reuter, Dirk AU - Heyn, Christian ID - 46278 IS - 3 JF - Nanomaterials KW - General Materials Science KW - General Chemical Engineering SN - 2079-4991 TI - Modeling of Masked Droplet Deposition for Site-Controlled Ga Droplets VL - 13 ER - TY - JOUR AU - Sieland, Benedikt AU - Stahn, Marcel AU - Schoch, Roland AU - Daniliuc, Constantin AU - Spicher, Sebastian AU - Grimme, Stefan AU - Hansen, Andreas AU - Paradies, Jan ID - 46277 JF - Angewandte Chemie International Edition KW - General Chemistry KW - Catalysis SN - 1433-7851 TI - Dispersion Energy‐Stabilized Boron and Phosphorus Lewis Pairs ER - TY - CONF AU - Clausing, Lennart AU - Guetattfi, Zakarya AU - Kaufmann, Paul AU - Lienen, Christian AU - Platzner, Marco ID - 45913 T2 - Proceedings of the 19th International Symposium on Applied Reconfigurable Computing (ARC) TI - On Guaranteeing Schedulability of Periodic Real-time Hardware Tasks under ReconOS64 ER - TY - CHAP AU - Tophinke, Doris ED - Feilke, Helmuth ID - 46099 T2 - Zwischen Fake und Fakt TI - "Tankrabatt" und "Freiheitsenergie". Wie der Blog "neusprech.org" politische Euphemismen entlarvt VL - 300 ER - TY - JOUR AU - Merten, Marie-Luis AU - Wever, Marcel AU - Tophinke, Doris AU - Geierhos, Michaela AU - Hüllermeier, Eyke ID - 45673 JF - International Journal of Corpus Linguistics TI - Annotation uncertainty in the context of grammatical change ER - TY - THES AU - Tornede, Alexander ID - 45780 TI - Advanced Algorithm Selection with Machine Learning: Handling Large Algorithm Sets, Learning From Censored Data, and Simplyfing Meta Level Decisions ER - TY - THES AU - Spiess-Bru, Clarissa ID - 46296 TI - Information Asymmetry and Gendered Behavior in Organizations and Digital Markets ER - TY - CONF AB - A frequency-flexible Nyquist pulse synthesizer is presented with optical pulse bandwidths up to fopt=100 GHz and repetition rates equal to fopt/9, fabricated in an electronic-photonic co-integrated platform utilizing linear on-chip drivers. AU - Kress, Christian AU - Schwabe, Tobias AU - Silberhorn, Christine AU - Scheytt, J. Christoph ID - 45578 T2 - Conference on Lasers and Electro-Optics (CLEO) 2023 TI - Generation of 100 GHz Periodic Nyquist Pulses using Cascaded Mach-Zehnder Modulators in a Silicon Electronic-Photonic Platform ER - TY - JOUR AU - Homt, Martina AU - Bloh, Bea ID - 46354 IS - 1 JF - Lehrerbildung auf dem Prüfstand TI - Der formelle Diskurs Forschenden Lernens in der Lehrerbildung. Ein Blick zurück nach vorn VL - 16 ER -