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Model Consistent (model + consistent)
Selected AbstractsRobust identification/invalidation in an LPV frameworkINTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 3 2010Fernando D. Bianchi Abstract A robust linear parameter varying (LPV) identification/invalidation method is presented. Starting from a given initial model, the proposed method modifies it and produces an LPV model consistent with the assumed uncertainty/noise bounds and the experimental information. This procedure may complement existing nominal LPV identification algorithms, by adding the uncertainty and noise bounds which produces a set of models consistent with the experimental evidence. Unlike standard invalidation results, the proposed method allows the computation of the necessary changes to the initial model in order to place it within the consistency set. Similar to previous LPV identification procedures, the initial parameter dependency is fixed in advance, but here a methodology to modify this dependency is presented. In addition, all calculations are made on state-space matrices which simplifies further controller design computations. The application of the proposed method to the identification of nonlinear systems is also discussed. Copyright © 2009 John Wiley & Sons, Ltd. [source] Multidimensional patterns of change in outpatient psychotherapy: The phase model revisitedJOURNAL OF CLINICAL PSYCHOLOGY, Issue 9 2007Niklaus Stulz In this study, groups of psychotherapy outpatients were identified on the basis of shared change patterns in the three dimensions of the phase model of psychotherapeutic outcome: well-being, symptom distress, and life functioning. Treatment courses provided by a national provider network of a managed care company in the United States (N = 1128) were analyzed using growth mixture models. Several initial patient characteristics (treatment expectations, amount of prior psychotherapy, and global assessment of functioning) allowed for the discrimination between three patient groups of shared change patterns. Those patterns can be classified into three groups as phase model consistent, partial rapid responders, or symptomatically highly impaired patients with each having typical change patterns. © 2007 Wiley Periodicals, Inc. J Clin Psychol 63: 817,833, 2007. [source] Cadaveric flatfoot model: Ligament attenuation and Achilles tendon overpullJOURNAL OF ORTHOPAEDIC RESEARCH, Issue 12 2009Andrew J. Blackman Abstract Flatfoot deformity is characterized by loss of the medial longitudinal arch, forefoot abduction, hindfoot eversion, and often Achilles tendon contracture. Our objectives were to validate a cadaveric flatfoot model that involves selective ligament attenuation and to determine if Achilles tendon overpull is associated with increased pes planus severity. We measured the three-dimensional (3D) orientation of the bones of interest in the unloaded, loaded, and Achilles tendon overpull conditions. A flatfoot model was created by attenuating ligaments involved in the pes planus deformity followed by cyclic axial loading, and bone orientations were acquired in the three conditions. Significant differences seen between normal feet and flat feet were consistent with those seen with the pes planus deformity. The first metatarsal dorsiflexed and abducted relative to the talus. The navicular abducted relative to the talus. The calcaneus everted relative to the tibia. The talus plantar flexed and adducted. Achilles overpull resulted in first metatarsal-to-talus dorsiflexion and navicular-to-talus abduction. Thus, selective ligament attenuation followed by cyclic axial loading can create a cadaveric flatfoot model consistent with the in vivo deformity. Longitudinal arch depression, hindfoot eversion, talonavicular joint abduction, forefoot abduction, and talar plantar flexion were seen. Simulated Achilles tendon contracture increased the severity of the deformity, particularly in arch depression and forefoot abduction. © 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 27:1547,1554, 2009 [source] Combined 4D-fingerprint and clustering based membrane-interaction QSAR analyses for constructing consensus Caco-2 cell permeation virtual screensJOURNAL OF PHARMACEUTICAL SCIENCES, Issue 1 2008Osvaldo A. Santos-Filho Abstract A set of 30 structurally diverse molecules, for which Caco-2 cell permeation coefficients were determined, formed the training set for construction of Caco-2 cell permeation models based upon membrane-interaction (MI) QSAR analysis and a new QSAR method called 4D-fingerprint QSAR analysis. The descriptor terms of the 4D-fingerprints equation are molecular similarity eigenvalues, and this set of descriptors is being evaluated as a potential "universal" QSAR descriptor set. The 4D-fingerprint model suggests that Caco-2 cell permeation is governed by the spatial distribution of hydrogen bonding and nonpolar groups over the molecular shape of a molecule. Moreover, a complementary resampling of the original Caco-2 cell permeation training set, followed by the construction of several "clustered" MI-QSAR models, led to a consensus model consistent in interpretation with the 4D-fingerprint model. © 2007 Wiley-Liss, Inc. and the American Pharmacists Association J Pharm Sci 97:566,583, 2008 [source] Social and trauma-related pathways leading to psychological distress and functional limitations four years after the humanitarian emergency in Timor-LesteJOURNAL OF TRAUMATIC STRESS, Issue 1 2010D. Silove There is growing acknowledgment that research in the postconflict field needs to include a focus on social conditions. The authors applied structural equation modeling to epidemiologic data obtained from postconflict Timor-Leste, to examine for links involving potentially traumatic events and sociodemographic factors (age, gender, educational levels, and unemployment) with psychological symptoms and functioning. Exposure to trauma and lack of education emerged as most relevant with psychological distress impacting on education in the urban area. Age and gender exerted influences at different points in the model consistent with the known history of Timor. Although based on cross-sectional data, the model supports the relevance of past trauma, posttraumatic distress, and postconflict social conditions to functioning in societies such as Timor-Leste. [source] Language out of Music: The Four Dimensions of Vocal LearningTHE AUSTRALIAN JOURNAL OF ANTHROPOLOGY, Issue 3 2008Nicholas Bannan A growing consensus drawing on research in a wide variety of disciplines has, over the last fifteen years or so, argued the need to revisit Darwin's conjecture of 1871 that language may be descended from an existing, musical medium of communication that developed from animal calls. This paper seeks to examine, in an extension of Hockett's analysis of the design features required for linguistic communication, the nature of the acoustic information produced and perceived in human vocalisation, and to consider the anatomical and neural mechanisms on which these depend. An attempt is made to sketch an evolutionary chronology for key prerequisites of human orality. Cross-species comparisons are employed to illuminate the role of four acoustic variables (pitch, duration, amplitude and timbre), viewing the potential for human vocal productivity from the perspective of animal communication. Although humans are the only species to combine entrainment to pulse with attunement to precisely-tracked pitches, we also depend both for musical interaction and the production and perception of vowel sounds on precise and conscious control of the property of timbre. Drawing on, amongst others, Scherer's analyses of emotionally triggered sounds in a variety of species, and Fernald's presentation of the similarities of infant cries and adult production of infant-directed speech in a variety of cultures and languages, a case is made for the instinctive components of human communication being more music-like than language-like. In conclusion, historical and comparative data are employed to outline the adaptive and exaptive sequence by which human vocal communication evolved. The roles of selective pressures that conform to different adaptive models are compared,natural selection, sexual selection, group selection,leading to the proposal that all of these must have played their part at different stages in the process in a ,mosaic' model consistent with the development of other human traits. [source] | ||||||||||