1,356,376 research outputs found
Delay-dependent fault-tolerant controller for time-delay systems with randomly occurring uncertainties
No full textThis paper addresses the passivity-based H control problem for a class of time-varying delay systems subject to nonlinear actuator faults and randomly occurring uncertainties via fault-tolerant controller. More precisely, the uncertainties are described in terms of stochastic variables, which satisfies Bernoulli distribution, and the existence of actuator faults are assumed not only linear but also nonlinear, which is a more general one. The main objective of this paper is to design a state feedback-reliable controller such that the resulting closed-loop time-delay system is stochastically stable under a prescribed mixed H and passivity performance level Î3>0 in the presence of all admissible uncertainties and actuator faults. Based on Lyapunov stability method and some integral inequality techniques, a new set of sufficient conditions is obtained in terms of linear matrix inequality (LMI) constraints to ensure the asymptotic stability of the considered system. Moreover, the control design parameters can be computed by solving a set of LMI constraints. Finally, two examples including a quarter-car model are provided to show the efficiency and usefulness of the proposed control scheme. Copyright © 2017 John Wiley & Sons, Ltd
Data for: Genetic structure of a small brood-stock population of cobia (Rachycentron canadum) through pedigree analyses
No full textThe original data in MS-Excel file has been uploaded
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Broadcasters' right in the digital era ::copyright concerns on live streaming /
No full text"In Broadcasters' Rights in the Digital Era, Sakthivel provides a cogent understanding into a hitherto unchartered territory on the applicability of copyright law on the live streaming of 'entertainment content'- an emerging medium of communication. The book examines in exhaustive breadth the scope of broadcasters' neighbouring rights under the copyright regime in the light of technological advancements vis-à-vis authors' right and explores the experiences of EU & USA and then suggests suitable changes to the Indian Copyright regime. Sakthivel employs technological analysis and existence of differential market for different mediums to substantiate the relationship of live streaming and the copyright regime"
Crystal structures of cellulose II derived from packing energy minimization by A Sakthivel
No full textPh.D
Blast loading on concrete framed structures
No full textDisproportionate collapse occurs when the removal of load bearing members (one or more columns, or load bearing walls) results in localized structural damage which leads to further loss of load bearing members and, ultimately, to the collapse of whole or part of the structure. It is often necessary to design critical load bearing elements to resist the effects of blast if a structure is considered at risk from attack. This necessitates the estimation of blast load and its effects on load bearing elements. This paper discusses the assessment of blast load and its effect on building frames. It also briefly introduces a method for evaluating the strength of reinforced concrete structures, subjected to intense blast loading. As a case study, the Murrah Building collapse is considered, in which direct blast pressure resulted in the brisance failure of a column and the shearing of two columns. This local failure of load bearing elements resulted in a progressive collapse that destroyed half the floor area of the building, with the loss of 168 lives. This building frame reanalyzed without the use of a transfer girders that have been cited as partly responsible for the extent of the collapse
The diagnosis and management of congenital dislocation of the hip
No full textCongenital dislocation of the hip (CDH) or developmental dysplasia of the hip (DDH) is a common condition that encompasses a spectrum of pathology affecting the neonatal hip. Clinical signs of instability may be difficult to detect at birth using the Barlow Ortolani test. A clear imperative is to make an early diagnosis since delay after 3 months is synonymous with the necessity for surgery and also leads to a compromised prognosis. There is considerable controversy about clinical screening for DDH or ultrasound screening, either comprehensive or selective. Risk factors – such as breech presentation, oligohydramnios and talipes – are well known and there is some evidence that selective screening for these babies with ultrasound may assist diagnosis. The incidence of neonatal hip instability is around 15–20 per 1000 live births but that of established dislocation 1–2 per 1000 live births in unscreened cohorts. The usual early treatment is with the Pavlik harness but after 3 months, surgery – either an open or closed reduction – is necessary and in some surgically untreated children, secondary procedures such as pelvic osteotomy are necessary
AI-guided digital intervention with physiological monitoring reduces intrusive memories after experimental trauma
No full textTrauma prevalence is vast globally. Evidence-based digital treatments can help, but most require human guidance. Human guides provide tailored instructions and responsiveness to internal states, but limit scalability. Might generative AI and neurotechnology provide a scalable alternative? Here we provide a first test of ANTIDOTE, combining AI guidance and pupillometry to automatically deliver and monitor the Imagery Competing Task Intervention (ICTI). ICTI is a digital intervention developed by our group to reduce intrusive memories after psychological trauma, previously delivered with human guidance. One hundred healthy volunteers were exposed to videos of traumatic events and randomized to an intervention or active control condition. As predicted, intervention participants reported significantly fewer intrusive memories over the following week. Post hoc assessments confirmed the AI guide delivered the intervention successfully. Pupil size tracked intervention engagement and was associated with symptom reduction, providing a candidate biomarker. These findings suggest a path towards developing AI-guided digital interventions with scalability potential
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
Catenary action in steel-framed buildings
No full textThe current paper is of relevance to engineers engaged in the design of buildings in which severe column damage resulting from malicious actions is a design scenario. The tying force method as used for providing robustness to steel-framed buildings relies upon catenary action to redistribute loads following column damage. Fortunately severe column damage is extremely rare and for this reason it is not well understood if this load redistribution mechanism is reliable. The current paper presents results of an investigation into the tying force method by way of a case study of a steel-framed building in which support to a perimeter column is removed. Results indicate that industry standard beam-column connections possess insufficient ductility to accommodate the large floor displacements that occur during catenary action and the factor of safety against collapse is shown to be less than 0.2
Estimation of safe stand off distances for r.c. framed buildings
No full textThis paper discusses the assessment of blast load and its effect on reinforced concrete framed buildings. Using the direct solution of the multi-degree of freedom equations of motion, a method for analyzing r.c. columns is presented. The work demonstrates that solutions achieved using single degree of freedom equations of motion can underestimate the shear force in columns by as much as 50%. This finding is of importance with regard to robustness assessments of buildings carried out using TM5-1300. A method for estimating the safe stand off distance for reinforced concrete columns is presented together with application against the Murrah building collapse, by way of a case study. The Murrah Building collapse has been widely attributed to the use of transfer girders at the third floor level. The building is reanalyzed with a more conventional arrangement of beams and columns and the results show that a substantial progressive collapse could have occurred even if a transfer girder had not been used
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