173102 research outputs found
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First Mile: An Open Innovation Lab for Infrastructure-Assisted Cooperative Intelligent Transportation Systems
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Poster: Identifying Multipath in Phase-Based Ranging Measurements Using Channel Sounding
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Generalized Maxwell viscoelasticity for geometrically exact strings: Nonlinear port-Hamiltonian formulation and structure-preserving discretization
No full textThis contribution proposes a nonlinear and dissipative infinite-dimensional port-Hamiltonian (PH) model for the dynamics of geometrically exact strings. The mechanical model provides a description of large deformations including finite elastic and inelastic strains in a generalized Maxwell model. It is shown that the overall system results from a power-preserving interconnection of PH subsystems. By using a structure-preserving mixed finite element approach, a finite-dimensional PH model is derived. Eventually, midpoint discrete derivatives are employed to deduce an energy-consistent time-stepping method, which inherits discrete-time dissipativity for the irreversible system. An example simulation illustrates the numerical properties of the present approach
OpenAirLink: Reproducible Wireless Channel Emulation using Software Defined Radios
No full textThis paper presents OpenAirLink(OAL), an open- source channel emulator for reproducible testing of wireless scenarios. OAL is implemented on off-the-shelf software-defined radios (SDR) and presents a smaller-scale alternative to expensive commercially available channel emulators. Path loss and propagation delay are the fundamental aspects of emulating a wireless channel. OAL provides a simple method to change these aspects in real-time. The emulator is implemented using a finite impulse response (FIR) filter. The FIR filter is written in Verilog and flashed on the SDRs Field Programmable Gate Array (FPGA). Most processing transpires on the FPGA, so OAL does not require high-performance computing hardware and SDRs. We validate the performance of OAL and demonstrate the utility of such a channel emulation tool using two examples. We believe that open-source channel emulators such as OAL can make reproducible wireless experiments accessible to many researchers in the scientific community
Modellierung und Validierung von Latenzzeiten in industriellen Agentensystemen mit Digitalen Zwillingen der KI.Fabrik
No full textDurch die zunehmende Automatisierung und Digitalisierung von Produktionsprozessen ist eine effiziente Kommunikation und Koordination in Agentensystemen von entscheidender Bedeutung. Diese Studie analysiert die Verzögerungszeiten der Kommunikations- und Koordinationsprozesse in Agentensystemen anhand von zwei industriellen Anwendungsfällen. Durch die Kategorisierung von Nachrichten werden die lokalen und Netzwerk-Verzögerungen jeder Nachricht modelliert, gemessen und verglichen. Die Ergebnisse zeigen, dass die Modellierung von Verzögerungszeiten vor der Implementierung zu einem effizienteren Ansatz bei der Ausarbeitung der harten und weichen Echtzeitfähigkeiten komplexer Systeme führen kann. Die Generalisierbarkeit der Ergebnisse ermöglicht es, die Ergebnisse auf wiederkehrende Module in Produktionssystemen anzuwenden
