1,721,158 research outputs found
hArtes design flow for heterogeneous platforms
No full textThe hArtes -Holistic Approach to Reconfigurable real Time Embedded Systems- design flow addresses the development of an holistic tool-chain for reconfigurable heterogeneous platforms. The entire tool-chain consists of three phases: Algorithm Exploration and Translation, Design Space Exploration and System Synthesis. This paper evaluates the tools in the Design Space Exploration phase and the System Synthesis phase. The tools in the Design Space Exploration phase facilitate task partitioning, task optimization and assignment of the tasks to the appropriate hardware element. The tools in the System Synthesis phase facilitate the hardware/software co-design of embedded applications and perform compilation and HDL generation. The HDL designs are generated with a view of actual hardware/software co-execution on the real hardware platform. The XML Architecture Description File and the C Pragma Notations are used for information exchange between different tools. The XML architecture description file is also used to provide a flexible specification of the target architecture. Experimental results with H.264 video encoding application shows the viability of the hArtes design flow
Smart multicore embedded systems
No full textThis book provides a single-source reference to the state-of-the-art of high-level programming models and compilation tool-chains for embedded system platforms. The authors address challenges faced by programmers developing software to implement parallel applications in embedded systems, where very often they are forced to rewrite sequential programs into parallel software, taking into account all the low level features and peculiarities of the underlying platforms. Readers will benefit from these authors’ approach, which takes into account both the application requirements and the platform specificities of various embedded systems from different industries. Parallel programming tool-chains are described that take as input parameters both the application and the platform model, then determine relevant transformations and mapping decisions on the concrete platform, minimizing user intervention and hiding the difficulties related to the correct and efficient use of memory hierarchy and low level code generation
Using multi-objective design space exploration to enable run-time resource management for reconfigurable architectures
No full textResource run-time managers have been shown par- ticularly effective for coordinating the usage of the hardware resources by multiple applications, eliminating the necessity of a full-blown operating system. For this reason, we expect that this technology will be increasingly adopted in emerging multi- application reconfigurable systems.
This paper introduces a fully automated design flow that exploits multi-objective design space exploration to enable run- time resource management for the Molen reconfigurable archi- tecture. The entry point of the design flow is the application source code; our flow is able to heuristically determine a set of candidate hardware/software configurations of the application (i.e., operating points) that trade off the occupation of the reconfigurable fabric (in this case, an FPGA), the load of the master processor and the performance of the application itself. This information enables a run-time manager to exploit more efficiently the available system resources in the context of multiple applications.
We present the results of an experimental campaign where we applied the proposed design flow to two reference audio appli- cations mapped on the Molen architecture. The analysis proved that the overhead of the design space exploration and operating points extraction with respect to the original Molen flow is within reasonable bounds since the final synthesis time still represents the major contribution. Besides, we have found that there is a high variance in terms of execution time speedup associated with the operating points of the application (characterized by a different usage of the FPGA) which can be exploited by the run-time manager to increase/decrease the quality of service of the application depending on the available resources
Run-time optimization of a dynamically reconfigurable embedded system through performance prediction
No full textA key tool to increase the exploitation of dynamic reconfigurable platforms is the run-time resource manager. This system module coordinates the usage of both software and reconfigurable hardware resources in the context of a multi-programmed environment, by alleviating the operating system's induced overhead. This paper introduces a two-layers run-time resource manager for dynamic reconfigurable platforms. The upper level is composed of several application-level managers (one for each application) that provide the most suitable mapping based on resource constraints and performance prediction. The lower level is composed of a centralized system-level resource manager that assigns the HW/SW resources to each application. We present a video surveillance case study in which the proposed resource management technique outperforms the performance of the state of the art by 28% on average, introducing a computational time overhead within 2%
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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