1,720,995 research outputs found
Circuit Design and Power Consumption Analysis of Wireless Gas Sensor Nodes: One-Sensor versus Two-Sensor Approach
No full textWireless sensor networks (WSNs) have recently been applied in industrial monitoring applications including hazardous gases detection. As a major power consumer of a node, gas sensors may significantly constrain its lifetime. Hence, the sensing circuit must be carefully designed to optimize performance and retain accuracy. In this paper, we propose for the first time the principle of gas concentration measurement based on a single sensor in a voltage divider circuit, instead of the well-known Wheatstone bridge sensing circuit, which employs two sensors. We discuss the design of a real WSN node for gas sensing and evaluate it with respect to an identical platform that uses the Wheatstone bridge. The proposed approach ensures significant energy savings and helps to avoid zero offset issue. Besides, we employ a more efficient and secure sensor heating profile; it does not damage the sensor and does not make gas sensing dependent on environmental conditions. Experimental results show a 30% reduction in power with respect to the state-of-the-art
A 33 uW 64 x 64 Pixel Vision Sensor Embedding Robust Dynamic Background Subtraction for Event Detection and Scene Interpretation
No full textA 64x64-pixel ultra-low power vision sensor is presented, performing pixel-level dynamic background subtraction as the low-level processing layer of an algorithm for scene interpretation. The pixel embeds two digitally-programmable Switched-Capacitors Low-Pass Filters (SC-LPF) and two clocked comparators, aimed at detecting any anomalous behavior of the current photo-generated signal with respect to its past history. The 45 T, 26um square pixel has a fill-factor of 12%. The vision sensor has been fabricated in a 0.35um 2P3M CMOS process, powered with 3.3 V, and consumes 33uW at 13 fps, which corresponds to 620 pW/frame.pixel
A 33 μW 42 GOPS/W 64x64 pixels vision sensor with dynamic background subtraction for scene interpretation
No full textDesign of an innovative proximity detection embedded-system for safety application in industrial machinery
No full textSafety of machine operation is an increasingly important
matter in industrial applications. In this context, embedded
systems have successfully been employed to build
active barriers that react in real time to prevent injuries
and accidents. In this paper, we present a novel safety barrier,
based on the capacitive coupling effect, to detect the
proximity of the hands to a dangerous zone. Our study focuses
on the safety design phases of the system, according
to rule IEC 62061, including safety hazard analysis, SIL
allocation, and hardware design applied to a real industrial
machine for “stone cutting” purpose. Compliance
checking of reliability and safe failure fraction was performed
through FMEA methods ensuring that the system
can satisfy the SIL 2 safety level constraints
An industrial case study using an MBE approach: from architecture to safety analysis.
No full textWe discuss the initial phases of software development of a real industrial safety-related device in the railway application domain. In particular, to achieve greater confidence in the system, we illustrate the development of the system architecture (using a standard model domain-specific language), the computation of the safety integrity level and the calculation of the reliability of the whole system. We reiterate the safety analysis on the sub-systems. The proposed methodology has found immediate industrial applications
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
Design and implementation of the control structure of the PAPRICA-3 processorProceedings of 4th Euromicro Workshop on Parallel and Distributed Processing
No full textA High Speed VLSI Architecture for Handwriting Recognition
No full textThis article presents PAPRICA-3, a VLSI-oriented architecture for real-time processing of images and its implementation on HACRE, a high-speed, cascadable, 32-processors VLSI slice. The architecture is based on an array of programmable processing elements with the instruction set tailored to image processing, mathematical morphology, and neural networks emulation. Dedicated hardware features allow simultaneous image acquisition, processing, neural network emulation, and a straightforward interface with a hosting PC. HACRE has been fabricated and successfully tested at a clock frequency of 50 MHz. A board hosting up to four chips and providing a 33 MHz PCI interface has been manufactured and used to build BEATR IX, a system for the recognition of handwritten check amounts, by integrating image processing and neural network algorithms (on the board) with context analysis techniques (on the hosting PC)
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
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