Many software development organizations today aim at reducing their development effort, while improving the quality and diversity of their products by building more reusable software, for example using the product line approach. A product line infrastructure is set up for deriving the similar products, but this infrastructure degenerates over time, making reuse increasingly hard. As a counterme...

We present compiler technology for generating sparse matrix code from (i) dense matrix code and (ii) a description of the indexing structure of the sparse matrices. This technology embeds statement instances into a Cartesian product of statement iteration and data spaces, and produces efficient sparse code by identifying common enumerations for multiple references to sparse matrices. This appro...

In contrast to traditional software systems, the evolution of a Software Product Line (SPL) a ects not only artifacts like source code or requirements, but also variability information, which supports the customization of these artifacts across di erent products of the SPL. While some work exists that aims at characterizing the state and evolution of a product line from a feature perspective, t...

In recent work (Feldman and Karger [8]), we introduced a new approach to decoding turbo-like codes based on linear programming (LP). We gave a precise characterization of the noise patterns that cause decoding error under the binary symmetric and additive white Gaussian noise channels. We used this characterization to prove that the word error rate is bounded by an inverse polynomial in the cod...

EXTENT stands for an EXpert system for TENsor product formula Translation. In this paper, we describe the development of programs for fast Fourier transforms (FFT) for vector multiprocessors and distributed-memory machines using the EXTENT system for formula translation. Several forms of the FFT have been presented in the literature. Each form has diierent characteristics and is best suited for...

There are two good reasons for wanting to detect variability concepts in source code: migrating to a product-line development for an existing product, and restructuring a product-line architecture degraded by evolution. Although detecting variability in source code is a common step for the successful adoption of variability-oriented development, there exists no compilation nor comparison of app...

Transmission of delay-sensitive images over wireless channels can be hampered by insufficient bandwidth and unreliable channels. These challenges can be overcome by aggregation of multiple channels into a single, higher bandwidth logical channel and by employing strategic error correction. This paper addresses the problem of partitioning image data over multiple channels with unequal characteri...

Muhammad Raza 1,*, Kevin Schönleber 2 and Oriol Gomis-Bellmunt 1 1 Departament d’Enginyeria Electrica, Centre d’Innovacio Tecnologica en Convertidors Estatics i Accionaments (CITCEA-UPC), Universitat Politecnica de Catalunya, BarcelonaTECH. ETS d’Enginyeria Industrial de Barcelona, Barcelona 08028, Spain; [email protected] 2 Electrical Systems, GE Renewable Energy, Barcelona 08005, Spain; kev...

Clones are a well-known bad smell pattern in software. So far, research has concentrated on detection of clones in textual languages, while model-based development becomes increasingly important. This is in particular true for the automotive domain, where modelling languages like ASCET are used. This paper presents the adaptation and extension of an existing approach for detection of clones in ...

(1) University of Barcelona, Faculty of Physics, Department of Astronomy and Meteorology, Barcelona, Spain ([email protected]), (2) Water Research Institute, University of Barcelona, Spain, (3) Meteorological Service of Catalonia. Barcelona. Spain, (4) Barcelona Supercomputing Center-Centro Nacional de Supercomputación (BSC-CNS), Spain., (5) Dept. of Civil and Environmental Engineering, UPC, Bar...