1,720,961 research outputs found
VLSI Design and Verification Methodologies for Automotive Embedded Systems
No full textThis paper presents the verification process performed during the development of an automotive platform suited to interface a generic sensor. The platform aims to reduce the cost of the analog circuitry needed to interface the sensor, by massive usage of digital electronic, and by addressing a wide class of automotive applications based on sensor signal elaboration. Particularly, all the verification steps from identification of the right level of abstraction and hierarchy, platform hardware-software co-simulation and prototype hardware emulation are described
Platform-Based Design for Space Applications
No full textThis paper presents a platform-based approach adopted to develop a sensor interface for a generic spacequalified sensor. The design environment is composed by hardware blocks and software tools suitable for the design space exploration, while a proper verification methodology intents to guarantee the correct system behavior and to increase its reliability. An application case with a rate gyro sensor is being considered in order to tune the design flow. The approach aims to reduce the costs of the final chip in terms of either the development time, by exploiting the platform concept, or the involved circuitry, for the massive usage of the digital electronic in spite of the analog one
Generic Sensor Interface for on-Board Satellite Applications
No full textSatellite demands in terms of computational power, dimensions, mass, reliability and power consumption related to the electronic circuitry for on-board-processing (both payload and house keeping operations) are typically addressed with integrated solutions: System-on-Chip (SoC) has become a familiar term which identifies a complex heterogeneous system composed by one or more processing units, an application specific block-set and a variable number of general purpose [programmable] peripherals (communication, networking, memories). New design methodologies are required for the design and verification of such a complex SoC in a reasonable time. In this paper we applied the so called platform based approach for the development of a generic digital sensor interface: the interface gathers the data coming from a space qualified sensor and after a proper signal conditioning (offset calibration, linearization, thermal compensation) provides the processed information through a SpaceWire link
Highly Efficient Wideband Digital Frequency Demultiplexer
No full textThis paper presents an advanced ASIC architecture for a wideband digital frequency demultiplexer designed for on board satellite communication systems. The structure is able to handle up to 32 uniformly spaced channels extracted from a digital, real frequency division multiplexed signal sampled at 672 MHz; contiguous demultiplexing and remultiplexing is supported. An efficient demux two-stage parallel architecture was developed where all internal coefficients (including the FFT ones) are coded with canonic signed digit technique allowing area saving with respect to 2's complement code. Performance evaluations, in terms of bit error rate, noise to power ratio and gate complexity, were carried out for the architecture definition. Subsequently the design was coded in VHDL and synthesised on a 0.18 μm CMOS technology by means of SynopsysTM tools
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
Digital Signal Inspector for internal signals of pin-limited systems on package
No full textThe paper presents a Digital Signal Inspector (DSI) able to monitor the internal digital signals of a System on Package (SoP) with a limited number of pins. The DSI is made of a commercial FPGA-board, connected to the module for data sampling and controlled by PC via USB; a suited graphical interface allows for configuration, multi trace real time data display and post processing. The proposed DSI has been successfully applied for the characterization of an automotive SoP based on a MEM gyro sensor interfaced to an ASIC for proper signal conditioning
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
- …
