4,406 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
Low Malnutrition but High Mortality: Explaining the Paradox of the Lake Victoria Region
No full textExploiting DHS data from 235 regions in 29 Sub-Saharan Africa countries, we find that the combination of low levels of malnutrition together with dramatically high rates of mortality, encountered in Kenya\'s Lake Victoria territory, is unique for Sub-Saharan Africa. This paper explores the causes of this paradox for the Kenyan context. Our identification strategy consists of two parts. First of all, we apply multilevel regression models to control simultaneously for family and community clustering of the observed malnutrition and mortality outcomes. Secondly, to address unobserved but correlated factors, we exploit information from GIS and malaria databases to construct variables that capture additional components of children\'s geographic, political and cultural environment. Our analysis reveals that beneficial agricultural conditions and feeding practices lead to the observed sound anthropometric outcomes around Lake Victoria. In contrast, high mortality rates rest upon an adverse disease environment (malaria prevalence, water pollution, HIV rates) and a policy neglect (underprovision of health care services). Nonetheless, a significant effect of the local ethnic group, the Luo, on mortality remains.Child mortality, undernutrition, poverty, multilevel modeling, Sub-Saharan Africa
Low Malnutrition but High Mortality: Explaining the Paradox of the Lake Victoria Region
No full textExploiting DHS data from 235 regions in 29 Sub-Saharan Africa countries, we find that the combination of low levels of malnutrition together with dramatically high rates of mortality, encountered in Kenya's Lake Victoria territory, is unique for Sub-Saharan Africa. This paper explores the causes of this paradox for the Kenyan context. Our identification strategy consists of two parts. First of all, we apply multilevel regression models to control simultaneously for family and community clustering of the observed malnutrition and mortality outcomes. Secondly, to address unobserved but correlated factors, we exploit information from GIS and malaria databases to construct variables that capture additional components of children's geographic, political and cultural environment. Our analysis reveals that beneficial agricultural conditions and feeding practices lead to the observed sound anthropometric outcomes around Lake Victoria. In contrast, high mortality rates rest upon an adverse disease environment (malaria prevalence, water pollution, HIV rates) and a policy neglect (underprovision of health care services). Nonetheless, a significant effect of the local ethnic group, the Luo, on mortality remains. --Child mortality,undernutrition,poverty,multilevel modeling,Sub-Saharan Africa
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
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
Administrative Inertia in Addressing Legal Threats and Quality Assurance/Quality Improvement Research
No full textOn October 13, 2017, Langara held a Research Ethics Workshop to discuss quality assurance and legal issues around confidentiality in a post-secondary setting. The topics discussed were:
· Administrative Inertia in Addressing Legal Threats to Research Confidentiality Presenter: Aaren Ivers, Criminology, Simon Fraser University
· Is This Quality Assurance/Quality Improvement, Research… or Both? The Post-Secondary Context Presenter: Eugenie Lam, University of Victoria Research Ethics BoardAlso available for viewing on YouTube - https://youtu.be/9s-GNipCK1
Eating, Reading, and Writing: An Interview with Andrew Lam
No full textAward-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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