4,738 research outputs found
Visual Feedback Postural Control Re-education
No full textMaintaining postural stability is a complex process [1] involving the coordinated actions of biomechanical, sensory, motor, and central nervous system components. A relatively simple biomechanical definition for postural stability can be formulated in terms of the position of the body center of gravity relative to the base of support. The body movements used to maintain postural stability, however, are complex because of the number of joint systems and muscles involved. The center of gravity (CoG) is the point at which the whole weight of a body may be considered to act. In humans who are standing quietly and vertically erect, the CoG is located at the level of the hips and slightly forward of the ankle joints. CoG height is 0.5527 of total height. CoG and center of mass (CoM) are equivalent points in space when the gravitational field is uniform and gravity is the only force under consideration
Minḥat Kohen hebräisch 1668
No full textḥibro ... Avraham Kohen PimenṭelEnthält auf dem Titelblatt eine Formel, mit der Yehudah Leib ben Ḥanokh Zundel (1645-1705) die Bücher seiner Bibliothek kennzeichnete (s. Richler, B., The Establishment of a Beit-Midrash Library in 1693, in: Cohen, E.M. u.a. [Hg.], Meḥevah le-Menaḥem: Studies in Honor of Menahem Hayyim Schmelzer, Jerusalem 2019, 201-226); unleserliche Besitzereinträge auf Vorsatz, Titelblatt und vorderem Deckel könnten das Buch dann entsprechend R. Yehudah zuweise
Aging and vestibular system: specific tests and role of melatonin in cognitive involvement
No full textBalance disorders are frequent with aging. They are particularly important because they decrease social autonomy of the aged subjects and they often provoke falls. The cause is always multifactorial. There is evidence that aging affects multiple sensory inputs, as well as the muscoloskeletal system and central nervous system ability to perform sensorimotor integration. For the evaluation of decreased balance skills in elderly, a specific questionnaire has been prepared, in order to identify high risk of falling called falling risk inventory (FRI) questionnaire, and a complex psycho-sensory-motor test has been studied by means of posturography, in order to detect specific vestibular impairment. Regarding ethiopathogenesis of balance disorders in aged subjects, because the decline of behavioral and cognitive performances are due also to decline of biological rhythm control, the role of melatonin (the hormone regulating circadian rhythms, being strictly connected with cerebellar function, and it is well known that cerebellum acts in elderly both at motor and cognitive regulation. The goals of the present paper are: (i) To present a self-administered FRI questionnaire aimed at identifying possible causes of falls and quantifying falling risk in aged. (ii) To validate posturography as a specific test to investigate vestibular involvement in elderly in correlation with FRI. (iii) To present a complex behavioral test (NT) aimed at evaluating both spatial orientation and spatial memory in elderly, factors involved into the genesis of complex dizziness and unsteadiness. (iv) To evaluate the role of melatonin in cognitive involvement in dizzy, old subjects due to the functional correlations between circadian rhythms, cerebellum balance disturbances and cognitive disorders. General conclusions are: FRI correlates with falling risk. Posturography identifies specific vestibular impairments correlated to balance disorders and elderly falls. Spatial orientation is altered in about 40% of dizzy patients but no significant differences are revealed in melatonin rhythm. Spatial memory is highly altered only in subjects with inversion of circadian melatonin rhythm it is possible to hypothesize that the alteration of the normal circadian melatonin rhythm plays some role in the genesis of dizziness in a subpopulation of patients
Aging and vestibular system: specific tests and role of melatonin in cognitive involvement
No full textRylee Raz - Tell Your Story
No full textMy name is Rylee Raz. I went to the College of Southern Idaho in 2019 and graduated with my Associates Degree in Early Childhood Education. After graduating for the College of Southern Idaho I moved on to Boise State University to get my Bachelors Degree in Early Childhood Education. I am wanting to move on to teach my own classroom becoming a preschool teacher in the future
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Time-Space Lower Bounds for Two-Pass Learning
No full textA line of recent works showed that for a large class of learning problems, any learning algorithm requires either super-linear memory size or a super-polynomial number of samples [Raz, 2016; Kol et al., 2017; Raz, 2017; Moshkovitz and Moshkovitz, 2018; Beame et al., 2018; Garg et al., 2018]. For example, any algorithm for learning parities of size n requires either a memory of size Omega(n^{2}) or an exponential number of samples [Raz, 2016].
All these works modeled the learner as a one-pass branching program, allowing only one pass over the stream of samples. In this work, we prove the first memory-samples lower bounds (with a super-linear lower bound on the memory size and super-polynomial lower bound on the number of samples) when the learner is allowed two passes over the stream of samples. For example, we prove that any two-pass algorithm for learning parities of size n requires either a memory of size Omega(n^{1.5}) or at least 2^{Omega(sqrt{n})} samples.
More generally, a matrix M: A x X - > {-1,1} corresponds to the following learning problem: An unknown element x in X is chosen uniformly at random. A learner tries to learn x from a stream of samples, (a_1, b_1), (a_2, b_2) ..., where for every i, a_i in A is chosen uniformly at random and b_i = M(a_i,x).
Assume that k,l, r are such that any submatrix of M of at least 2^{-k} * |A| rows and at least 2^{-l} * |X| columns, has a bias of at most 2^{-r}. We show that any two-pass learning algorithm for the learning problem corresponding to M requires either a memory of size at least Omega (k * min{k,sqrt{l}}), or at least 2^{Omega(min{k,sqrt{l},r})} samples
"Why should I be moral?" : a critical assessment of three contemporary attempts to give an extra-moral justification of moral conduct
No full textIn this dissertation I consider three distinct attempts to answer the normative question “Why should I be moral?”, all of which assume that a successful answer must be capable of arguing someone who is currently not motivated by moral considerations at all into becoming moral. I outline an argument against the possibility of doing so which relies on the distinction between agent-relativity and agent-neutrality, and which states that since morality essentially involves agent-neutrality and since failure to recognize the reason-giving force of agent-neutral considerations is not necessarily irrational, one cannot be argued into being moral. I then show how the approaches of Christine Korsgaard, as encountered in her "The Sources of Normativity", Joseph Raz, as he puts it forth in “The Amoralist”, and lastly, David Brink as he puts it forth in “Self-Love and Altruism”, each in their different ways, fail in their attempts to argue someone into becoming moral
Interview with Michal Raz, author, What’s Wrong with the Poor? Psychiatry, Race, and the War on Poverty
No full textIn What’s Wrong with the Poor: Psychiatry, Race, and the War on Poverty (University of North Carolina Press, 2016), Mical Raz offers a deep dive into the theoretical roots of the Head Start program, and offers a fascinating story of unexpected policy origins and of the interplay between psychiatric theory, race, and U.S. social welfare policy
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