1,721,011 research outputs found
IEEE1451. 4: A way to standardize gas sensor
No full textThe selection of the optimal sensors to use in an electronic nose is fundamental to the success or failure of any particular olfactory system in a certain application. The experimentation and characterization of gas sensors require complex electronic noses designed for the specific sensor array under test. The absence of design generalizations and standard interfaces in artificial chemical sensing systems is a well-known problem usually leading to the re-calibration of the olfactory system whenever a sensor has to be substituted. Bigger problems come up when the migration to sensors based on a different principle is required (e.g. from resistive polymeric sensor to mass-variation QCM sensor); this necessity involves the re-design of part or even the whole olfactory system forcing research groups to great efforts in system design and software programming. In this paper, a solution to standardize gas sensors and electronic olfactory systems is presented
CLASSIFY SITUATIONS INTO A REINFORCEMENT BASED CONTROL SYSTEM: UNSUPERVISED LEARNING VERSUS HEURISTIC
No full textAn application of mobile robotics for olfactory monitoring of hazardous industrial sites
No full textPurpose – The purpose of this paper is to present a mobile robot with an olfactory capability for hazardous site survey. Possible applications include detection of gas leaks and dangerous substances along predefined paths, inspection of pipes in factories, and mine sweeping.
Design/methodology/approach – The mobile sentry is equipped with a transducer array of tin oxide chemical sensors, compliant with the standard interface IEEE 1451, which provides odour-sensing capability, and uses differential drive and spring-suspended odometric trackballs to move and localize in the environment. The monitoring strategy comprises two stages. First, a path learning operation is performed where the vehicle is remotely controlled through some potential critical locations of the environment, such as valves, pressure vessels, and pipelines. Then, the robot automatically tracks the prerecorded trajectory, while serving as an electronic watch by providing a real-time olfactory map of the environment. Laboratory experiments are described to validate the approach and assess the performance of the proposed system.
Findings – The approach was shown to be effective in experimental trials where the robot was able to detect multiple odour sources and differentiate between sources very close to one another.
Research limitations/implications – One limitation of the methodology is that it has been specifically designed for odour detection along a well-defined path in a highly structured environment, such as that expected in the industrial field. The problem of detection of leakages outside the search path is not addressed here.
Practical implications – This mobile robot can be of great value to detect hazardous fluid leakages in chemical warehouses and industrial sites, thus increasing the safety level for human operators.
Originality/value – The paper describes a mobile robotic system, which employs an odour-sensing capability to perform automated monitoring of hazardous industrial sites. A dynamic model of the mobile nose is also discussed and it is shown that it well describes the behaviour of the system
Semi - Autonomous Olfactive Environment Inspection by a Mobile Robot
No full textMobile robots can be of great value in the automated monitoring of chemical warehouses and industrial sites to prevent hazardous fluid leakages, thus increasing the safety level for human operators. This paper describes recent and current research at the University of Lecce aiming at developing a mobile platform with olfactory capability for hazardous site monitoring. An innovative smart transducer array of tin oxide chemical sensors, compliant with the standard interface IEEE 1451, is introduced and integrated on a differential drive mobile robot. A two stage strategy for environment inspection is proposed: first the vehicle is remotely controlled along a desired path (path learning phase), then the robot autonomously re-runs the path while recording in real time olfactory data of the environment. Experimental results relative to our laboratory environment are described
Self-Growing Neural Mechanisms for Pattern Categorization in Robotics
No full textWollongong (Australia
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
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