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Stochastic Interpretation of Quasi-periodic Event-based Systems
(2015)arXivMany networks used in machine learning and as models of biological neural networks make use of stochastic neurons or neuron-like units. We show that stochastic artificial neurons can be realized on silicon chips by exploiting the quasi-periodic behavior of mismatched analog oscillators to approximate the neuron's stochastic activation function. We represent neurons by finite state machines (FSMs) that communicate using digital events and ...Working Paper -
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VisAsim-Demonstration - Ein innovatives Kommunikations- und Planungsinstrument für Windenergieanlagen
(2015)Für einen nachhaltigen Ausbau der Windenergie ist es wesentlich, dass die Windenergieanlagen (WEA) von der lokalen Bevölkerung akzeptiert werden. In diesem Zusammenhang ist es notwendig, wichtige Aspekte wie die mögliche zukünftige Windenergielandschaft und die Geräusche der WEA mit geeigneten Kommunikationsmitteln zu veranschaulichen. Das im Rahmen eines SNF-Projekts von der ETH Zürich und der Empa gemeinsam entwickelte Instrument «VisAsim ...Report -
Causal Boxes: Quantum Information-Processing Systems Closed under Composition
(2015)arXivComplex information-processing systems, for example quantum circuits, cryptographic protocols, or multi-player games, are naturally described as networks composed of more basic information-processing systems. A modular analysis of such systems requires a mathematical model of systems that is closed under composition, i.e., a network of these objects is again an object of the same type. We propose such a model and call the corresponding ...Working Paper -
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Microcanonical and resource-theoretic derivations of the Non-Abelian Thermal State
(2015)arXivThe grand canonical ensemble lies at the core of quantum and classical statistical mechanics. A small system thermalizes to this ensemble while exchanging heat and particles with a bath. A quantum system may exchange quantities represented by operators that fail to commute. Whether such a system thermalizes and what form the thermal state has are questions about truly quantum thermodynamics. Here we investigate this thermal state from ...Working Paper -
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An Explicit Implicit Scheme for Cut Cells in Embedded Boundary Meshes
(2015)SAM Research ReportWe present a new mixed explicit implicit time stepping scheme for solving the linear advection equation on a Cartesian cut cell mesh. Our scheme uses a standard second-order explicit scheme on Cartesian cells away from the embedded boundary. On cut cells, a second-order implicit scheme is used. This approach overcomes the small cell problem – that standard schemes are not stable on the arbitrarily small cut cells – while keeping the cost ...Report