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Browsing University of Hertfordshire by Author "Riehme, Jan"
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Adjoints for time-dependent optimal control
Riehme, Jan; Walther, Andrea; Stiller, Jörg; Naumann, Uwe (Springer Nature, 2008-10-20)The use of discrete adjoints in the context of a hard time-dependent optimal control problem is considered. Gradients required for the steepest descent method are computed by code that is generated automatically by the ... -
Automatic first- and second-order adjoints for truncated Newton
Naumann, Uwe; Maier, M.; Riehme, Jan; Christianson, B. (Polskie Towarzystwo Informatyczne, 2007)The analysis and modification of numerical programs in the context of generating and optimizing adjoint code automatically probably ranges among the technically and theoretically most challenging source transformation ... -
A framework for proving correctness of adjoint message-passing programs
Naumann, Uwe; Hascoët, Laurent; Hill, Chris; Hovland, Paul; Riehme, Jan; Utke, Jean (Springer Nature, 2008-11-26)We propose a technique for proving correctness of adjoint message passing programs that relies on data dependences in partitioned global address space. As an example we discuss asynchronous unbuffered send/receive using MPI. -
An L-Attributed Grammar for Adjoint Code
Naumann, Uwe; Riehme, Jan (PTI, 2007)Gradients of high-dimensional functions can be computed efficiently and with machine accuracy by so-called adjoint codes. We present an L-attributed grammar for the single-pass generation of intraprocedural adjoint code ... -
Reverse engineering of initial and boundary conditions with TELEMAC and algorithmic differentiation
Merkel, Uwe; Riehme, Jan; Naumann, Uwe (2013)The TELEMAC-SUITE with Algorithmic Differentiation (TELEMAC-AD) calculates the impact of a high number of spatially distributed parameters on flow conditions. This technique is a revolutionary step forward in open channel ... -
Second-order adjoints by source code manipulation of numerical programs
Naumann, U.; Maier, M.; Riehme, Jan; Christianson, B. (RWTH Aachen, 2007)The analysis and modification of numerical programs in the context of generating and optimizing adjoint code automatically probably ranges among the technically and theoretically most challenging source transformation ... -
Uncertainty quantification based on forward sensitivity analysis in SISYPHE
Riehme, Jan; Kopmann, R.; Naumann, Uwe (ECCOMAS, 2010) -
Using reliability analysis in morphodynamic simulation with TELEMAC-2D/SISPHYE
Kopmann, R.; Merkel, Uwe; Riehme, Jan (2012)