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Effective Models (effective + models)
Selected AbstractsA Review of Mathematical Models for Hydrogen and Direct Methanol Polymer Electrolyte Membrane Fuel CellsFUEL CELLS, Issue 1-2 2004K.Z. Yao Abstract This paper presents a review of the mathematical modeling of two types of polymer electrolyte membrane fuel cells: hydrogen fuel cells and direct methanol fuel cells. Models of single cells are described as well as models of entire fuel cell stacks. Methods for obtaining model parameters are briefly summarized, as well as the numerical techniques used to solve the model equations. Effective models have been developed to describe the fundamental electrochemical and transport phenomena occurring in the diffusion layers, catalyst layers, and membrane. More research is required to develop models that are validated using experimental data, and models that can account for complex two-phase flows of liquids and gases. [source] Meeting the Needs of Evidence-based Practice in Family Therapy: Developing the Scientist-practitioner ModelJOURNAL OF FAMILY THERAPY, Issue 2 2002D. Russell Crane Effective models of clinical training have been and continue to be a primary topic of discussion in the field of family therapy, particularly given the needs of evidence-based practice. This article outlines the major historical and contemporary struggles of one such model of clinical training and practice: the scientist-practitioner model. Throughout the article, the principles of the scientist-practitioner model and evidence-based practices are compared and contrasted. Suggestions for overcoming the contemporary challenges faced by the scientist-practitioner in a family therapy practice or in an educational environment are discussed. [source] Risk adjusted resource utilization for AMI patients treated in Japanese hospitalsHEALTH ECONOMICS, Issue 4 2007Edward Evans Abstract Though risk adjustment is necessary in order to make equitable comparisons of resource utilization in the treatment of acute myocardial infarction patients, there is little in the literature that can be practically applied without access to clinical records or specialized registries. The aim of this study is to show that effective models of resource utilization can be developed based on administrative data, and to demonstrate a practical application of the same models by comparing the risk-adjusted performance of the hospitals in our dataset. The study sample included 1748 AMI cases discharged from 10 large, private teaching hospitals in Japan, between 10 April 2001 and 30 June 2004. Explanatory variables included procedures (CABG and PCI), length of stay, outcome, patient demographics, diagnosis and comorbidity status. Multiple linear regression models constructed for the study were able to account for 66.5, 27.7, and 58.4% of observed variation in total charges, length of stay and charges per day, respectively. The performance of models constructed for this study was comparable to or better than performance reported by other studies that made use of explanatory variables extracted from clinical data. The use of administrative data in risk adjustment makes broad scale application of risk adjustment feasible. Copyright © 2006 John Wiley & Sons, Ltd. [source] Notes on quantitative structure-properties relationships (QSPR) (1): A discussion on a QSPR dimensionality paradox (QSPR DP) and its quantum resolutionJOURNAL OF COMPUTATIONAL CHEMISTRY, Issue 7 2009Ramon Carbó-Dorca Abstract Classical quantitative structure-properties relationship (QSPR) statistical techniques unavoidably present an inherent paradoxical computational context. They rely on the definition of a Gram matrix in descriptor spaces, which is used afterwards to reduce the original dimension via several possible kinds of algebraic manipulations. From there, effective models for the computation of unknown properties of known molecular structures are obtained. However, the reduced descriptor dimension causes linear dependence within the set of discrete vector molecular representations, leading to positive semi-definite Gram matrices in molecular spaces. To resolve this QSPR dimensionality paradox (QSPR DP) here is proposed to adopt as starting point the quantum QSPR (QQSPR) computational framework perspective, where density functions act as infinite dimensional descriptors. The fundamental QQSPR equation, deduced from employing quantum expectation value numerical evaluation, can be approximately solved in order to obtain models exempt of the QSPR DP. The substitution of the quantum similarity matrix by an empirical Gram matrix in molecular spaces, build up with the original non manipulated discrete molecular descriptor vectors, permits to obtain classical QSPR models with the same characteristics as in QQSPR, that is: possessing a certain degree of causality and explicitly independent of the descriptor dimension. © 2008 Wiley Periodicals, Inc. J Comput Chem, 2009 [source] Policy issues related to the rehabilitation of the surgical cancer patient,JOURNAL OF SURGICAL ONCOLOGY, Issue 5 2007Maria Hewitt DrPH Abstract Four policy challenges that face the rehabilitation community in providing services to surgical cancer patients are reviewed: (1) achieving capacity to meet the complex rehabilitation needs of a growing population of cancer patients and long-term survivors; (2) identifying effective models for delivering cancer rehabilitation services; (3) understanding complex insurance coverage and payment policies and determining their effects on access to rehabilitation services; and (4) investing in clinical and health services research to guide rehabilitation practice. Recommendations are made to increase the recognition of cancer rehabilitation as an essential component of cancer survivors' care, improve access to appropriate rehabilitation services, and accelerate the pace of cancer rehabilitation research. J. Surg. Oncol. 95:370,385. © 2007 Wiley-Liss, Inc. [source] Breast reconstruction following mastectomy: current status in AustraliaANZ JOURNAL OF SURGERY, Issue 9 2003Kerstin Sandelin Background: Although breast reconstruction provides some advantages for women following mastectomy, few Australian breast cancer patients currently receive reconstruction. In Australia, the routine provision of breast reconstruction will require the development of specific health service delivery models. The present paper reports an analysis of the provision of breast reconstruction in eight sites in Australia. Methods: A semi-structured telephone interview was conducted with 10 surgeons offering breast reconstruction as part of their practice, including nine breast or general surgeons and one plastic surgeon. Results: Surgeons reported offering breast reconstruction to all women facing mastectomy; the proportion of women deciding to have breast reconstruction varied between sites with up to 50% of women having a reconstruction at some sites. Most sites offered three types of reconstruction. Two pathways emerged: either the breast surgeon performed the breast surgery in a team with the plastic surgeon who undertook the breast reconstruction or the breast surgeon provided both the breast surgery and the reconstruction. Considerable waiting times for breast reconstruction were reported in the public sector particularly for delayed reconstruction. Surgeons reported receiving training in breast reconstruction from plastic surgeons or from a breast surgery team that performed reconstructions; a number had been trained overseas. No audits of breast reconstruction were being undertaken. Conclusions: Breast reconstruction can be offered on a routine basis in Australia in both the private and public sectors. Women may be more readily able to access breast reconstruction when it is provided by a breast surgeon alone, but the range of reconstruction options may be more limited. If access to breast reconstruction is to be increased, there will be a need to: (i) develop effective models for the rural sector taking account of the lack of plastic surgeons; (ii) address waiting times for reconstruction surgery in the public sector; (iii) review costs to women in the private sector; (iv) develop a better understanding of women's views and how best to communicate about breast reconstruction; and (v) improve training in breast reconstruction. [source] Where should people with dementia live?BRITISH JOURNAL OF LEARNING DISABILITIES, Issue 1 2008Using the views of service users to inform models of care Accessible summary We wanted to know what people with learning disabilities know about dementia. We asked service users what the word meant to them, if they knew anyone with dementia, and what it was like to share a house with someone who has dementia. We learnt that: ,Service users can know a lot about dementia. ,Living with someone with dementia can be really hard , and staff do not always, have enough time for everyone else. ,Services should think more about how dementia affects everyone , not just the person who has the dementia. Summary This paper reports on research that illuminates how people with a learning disability understand dementia and indicates the implications of these understandings for developing appropriate models of care. As this new policy and practice area struggles to provide appropriate and effective models of care for people with a learning disability and dementia, an awareness of service users' understandings of dementia leads to a number of important insights. The wider research programme from which this paper is drawn aims to identify best practice in supporting people with learning disabilities to stay in their own homes as they grow older and develop dementia. A combination of focus groups, ethnography and individual interviews were conducted at eight sites across England. Participants were people with a learning disability who had dementia, and those who have lived with someone with dementia. The findings have the potential to improve support to this population as they grow older. [source] | |||||||||||||