Showing papers on "Source transformation published in 2011"
TL;DR: In this article, the authors present results of theoretical analysis as well as full wave finite element simulations, proving that the complex power and impedance associated with an electromagnetic source are not changed by source transformation methods.
Abstract: Transformation optics is a methodology that has proven useful in the design of complex media used to alter and control electromagnetic waves in either passive space or regions that contain source distributions. Recently it has been shown that the application of source transformations can reshape field radiation patterns corresponding to arbitrarily shaped sources. In the accompanying numerical confirmations, the effect of source transformations on fundamental quantities that are critical to the design and evaluation of antenna based systems--such as complex power and impedance, remain unexplored. In this paper, we present results of theoretical analysis as well as full wave finite element simulations, proving that the complex power and impedance associated with an electromagnetic source are not changed by source transformation methods. These results open the door to the application of source transformations for the design of practical antenna based systems, such as conformal and phased array antenna design. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26077
4 citations
01 Jan 2011
TL;DR: A rigorous method is proposed that allows to obtain a model which faithfully represents the behavior of a mixed hardware/software system from a model of its application software and a models of its underlying hardware architecture.
Abstract: Performance of embedded applications strongly depends on features of the hardware platform on which they are deployed. A grand challenge in complex embedded systems design is developing methods and tools for modeling and analyzing the behavior of an application software running on a given hardware architecture. We propose a rigorous method that allows to obtain a model which faithfully represents the behavior of a mixed hardware/software system from a model of its application software and a model of its underlying hardware architecture. The method takes a model of the application software in BIP, a model of the hardware architecture in XML and a mapping associating read and write operations of the application software with execution paths in the architecture. It builds a model of the corresponding mixed hardware/software system in BIP. The latter can be simulated and analyzed for verification of both functional and extra-functional properties. The method consists in progressively enriching the application software model. It involves three steps: 1) The generation of a BIP model of the application software; 2) The generation of a BIP model of the hardware architecture; 3) The composition of the two models. The steps are implemented by application of source-to-source transformations that are correct-by-construction. In particular they preserve functional properties of the application software. The obtained system model is highly parametrized and allows flexible integration of specific target architecture features, such as bus policy and scheduling policy of the processors. The method has been implemented for application software and hardware architectures described in the DOL tool for performance evaluation. It is illustrated through the construction of a system model of an MJPEG application running on an MPARM architecture.
3 citations