3,603 research outputs found
Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance
No full textRepetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by and – norms
REDUCTION OF THE VIBRATION-ROTATION-LAM HAMILTONIAN
No full textAuthor Institution: Department of Physics, Texas Tech UniversityThe vibration-rotation-LAM Hamiltonian requires two independent separation conditions to reduce the Coriolis interaction and the vibration-LAM kinetic energy interaction. In the limit of the LAM approaching a SAM, the effective vibration-rotation Hamiltonian and/or energy must reduce to the usual vibration-rotation Hamiltonian when no internal motion is a LAM. We show how to perform this reduction, especially as it relates to the T-and R-transformations and the normal coordinate transformation
Utility of novel diagnostic tests for tuberculosis using human urine
No full textIncludes abstract.Includes bibliographical references.Two thirds of new TB cases in sub-Saharan Africa are HIV coinfected. HIV-TB co-infection increases the incidence of extra-pulmonary, sputum smear-negative and sputum-scarce TB. In these vulnerable patientgroups with high mortality rates, sputum-based diagnostic tools are unhelpful. Urine-based diagnostics offer an attractive, easily available alternative for rapid diagnosis. We evaluated the point-of-care urine LAM strip test (Determine TB LAM Ag test, Alere) and urine-based Xpert MTB/RIF for TB diagnosis in two patient cohorts with high HIV prevalence. A spot urine sample was collected from two cohorts of persons with suspected TB. The first cohort consisted of ambulatory primary care clinic patients suspected of having TB (group 1) whilst the second comprised hospitalised patients with suspected HIV co-infection (group 2). The urine LAM ELISA, LAM strip test and Xpert MTB/RIF were performed according to the manufacturer’s instructions. In addition, the effects of using an alternative ‘rulein’ cut-point for the urine LAM strip test and a pelleted (2-10ml) urine sample for Xpert MTB/RIF testing on diagnostic accuracy and inter-reader reliability was assessed. The diagnostic reference standard was M. tuberculosis culture positivity
Lipoarabinomannan in urine during tuberculosis treatment: association with host and pathogen factors and mycobacteriuria.
Get PDFBACKGROUND: Detection of lipoarabinomannan (LAM), a Mycobacterium tuberculosis (Mtb) cell wall antigen, is a potentially attractive diagnostic. However, the LAM-ELISA assay has demonstrated variable sensitivity in diagnosing TB in diverse clinical populations. We therefore explored pathogen and host factors potentially impacting LAM detection. METHODS: LAM-ELISA assay testing, sputum smear and culture status, HIV status, CD4 cell count, proteinuria and TB outcomes were prospectively determined in adults diagnosed with TB and commencing TB treatment at a South African township TB clinic. Sputum TB isolates were characterised by IS61110-based restriction fragment length polymorphism (RFLP) and urines were tested for mycobacteriuria by Xpert® MTB/RIF assay. RESULTS: 32/199 (16.1%) of patients tested LAM-ELISA positive. Median optical density and proportion testing LAM positive remained unchanged during 2 weeks of treatment and then declined over 24 weeks. LAM was associated with positive sputum smear and culture status, HIV infection and low CD4 cell counts but not proteinuria, RFLP strain or TB treatment outcome. The sensitivity of LAM for TB in HIV-infected patients with CD4 counts of ≥ 200, 100-199, 50-99, and < 50 cells/μl, was 15.2%, 32%, 42.9%, and 69.2% respectively. Mycobacteriuria was found in 15/32 (46.9%) of LAM positive patients and in none of the LAM negative controls. CONCLUSIONS: Urinary LAM was related to host immune factors, was unrelated to Mtb strain and declined steadily after an initial 2 weeks of TB treatment. The strong association of urine LAM with mycobacteriuria is a new finding, indicating frequent TB involvement of the renal tract in advanced HIV infection
sj-pdf-1-hpq-10.1177_1359105320966639 – Supplemental material for The prevalence of psychological consequences of COVID-19: A systematic review and meta-analysis of observational studies
No full textSupplemental material, sj-pdf-1-hpq-10.1177_1359105320966639 for The prevalence of psychological consequences of COVID-19: A systematic review and meta-analysis of observational studies by Teresa Arora, Ian Grey, Linda Östlundh, Kin Bong Hubert Lam, Omar M Omar and Danilo Arnone in Journal of Health Psychology</p
Adding Mobility to Networked Channel-Types
Get PDFThis paper reports the specification of a sound concept for the mobility of network-channel-types in KRoC.net. The syntax and semantics of KRoC.net have also been modified in order to integrate it more seamlessly into the occam-pi language. These new features are currently in the process of being implemented. Recent developments in occam-pi and KRoC (such as live/dead channel-type-ends and mobile processes) are described, together with their impact on KRoC.net. This paper gives an overview of the recent developments in KRoC.net, and presents its proposed final semantics, as well as the proposed interface between the KRoC.net infrastructure and the KRoC compiler
A comparative study of standard contract conditions for energy performance contracting in Australia, Canada and the United States
No full textAuthor name used in this publication: Lam, P.T.I.Author name used in this publication: Lee, P.2014-2015 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedPublisher permissio
Stiffness-force feedback in UAV tele-operation
No full textAerospace Design, Integration and OperationsAerospace Engineerin
Eating, Reading, and Writing: An Interview with Andrew Lam
Get PDFAward-winning author and New American Media editor Andrew Lam discusses his work, contemporary journalism, the complexity of cultural exchange, and what he hopes to see when his work is read in a classroom
Free Will Conceptualization Systematic Review Non Pre-Registered Analysis Datafile and Code
No full textThis page is for the non-pre-registered correlation analysis regarding the number of years ago and the sample size, as suggested by the peer reviewer Prasad Chandrashekar. For other materials of this project led by Alison Lam (first author) and Siu Kit Yeung as co-author (second author), please see https://osf.io/2t67z
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