3,216 research outputs found
Bona. Una riscoperta
No full textBona Tibertelli de Mandiargues (Roma, 1926 - Parigi, 2000) è una delle protagoniste del secondo Surrealismo, di cui questo saggio, insieme agli altri contenuti nel catalogo della prima retrospettiva dedicatale al Museo Nivola nel 2023, avvia la riscoperta. Artista e scrittrice vicina a Breton fin dal suo trasferimento a Parigi nel 1950, Bona esplora i temi dell’eros e del fantastico, della metamorfosi e dell’androgino attraverso la pittura e una peculiare tecnica di assemblage tessile, in un processo alchemico che trasforma la materia, creando una personalissima visione del mondo
Performance analysis of a new header compression scheme for TCP streams in IP based wireless networks
No full textIn this paper, a new header compression scheme for TCP streams, as a specific header compression profile within the IETF ROHC platform, is proposed and analyzed through simulations by the Network Simulator. The proposed scheme is based on the distinct management of DATA and ACK streams associated to the TCP connection and it exploits a robust header encoding technique (W-LSB) for reducing the effect of error propagation. The achieved results, in terms of throughput, overhead and goodput, reported as a function of bandwidth and BER and compared with the results obtained without compression, allow its to evaluate the performance of the proposed compression scheme in a realistic and dynamic environment
Effects of levodopa oral bolus on the kinematics of the pointing movements in Parkinson's disease patients.
No full textWe studied the time-course of a levodopa oral bolus effects on the kinematics of patients affected by a mild akinetic-rigid form of idiopathic Parkinson's disease (PD). Eleven PD patients were evaluated: a) in OFF-state, that is before their first medication or after its withdrawal, b) in ON-state, that is at 1/2, 1, 2, 3, 4, 5, 6, 24, 30 and 48 hours after the administration of 250 mg of levodopa plus 25mg of carbidopa. The main kinematics (i. e.movement time, peak of velocity, peak of acceleration and peak of deceleration) of pointing movements to six target-stimuli placed on the horizontal plane of a table were recorded. Clinical conditions were assessed according to the Motor Examination section of the Unified Parkinson's Disease Rating Scale. The levopoda bolus had stable clinical effects only within the first six hours from its administration. The decline of the clinical response was marked by the changes of peak acceleration whereas other kinematics (i. e. movement time and the peak of velocity) changed also in the late observations (24, 30 and 48 hours after drug intake). The dissociation between the persistent improvement on movement time on peak velocity and the rapid deterioration of levodopa effects on early kinematics (i. e. peak acceleration) could be accounted for by a progressive decline in movement programming
A systematic review of neuropsychiatric symptoms in mild cognitive impairment
No full textMild cognitive impairment (MCI) is a clinical concept proposed as an intermediate state between normal aging and dementia. This condition has multiple heterogeneous sources, including clinical presentation, etiology, and prognosis. Recently, the prevalence and associated features of neuropsychiatric symptoms (NPS) in MCI have been described. We systematically searched the PubMed database (last accessed on August 31, 2008) for articles on NPS in MCI. Included articles used strict selection criteria, and outcome variables were extracted in duplicate; of the 27 articles included, 14 (52%) used prospective cohorts. The global prevalence of NPS in MCI ranged from 35% to 85%. The most common behavioral symptoms were depression, anxiety, and irritability. Hospital-based samples reported a higher global prevalence of NPS than population-based studies; this discrepancy probably reflected differences in demographics, study setting, MCI diagnostic criteria, and behavioral instruments used. Prospective studies showed that NPS, particularly depression, may represent risk factors for MCI or predictors for the conversion of MCI to Alzheimer's disease (AD). NPS are very prevalent in subjects with MCI, displaying a similar pattern of symptoms compared to dementia and AD. Large cohort studies using standardized MCI criteria and behavioral instruments are required to evaluate the prognostic role of NPS in MCI.Mild cognitive impairment (MCI) is a clinical concept proposed as an intermediate state between normal aging and
dementia. This condition has multiple heterogeneous sources, including clinical presentation, etiology, and prognosis. Recently,
the prevalence and associated features of neuropsychiatric symptoms (NPS) in MCI have been described. We systematically
searched the PubMed database (last accessed on August 31, 2008) for articles on NPS in MCI. Included articles used strict
selection criteria, and outcome variables were extracted in duplicate; of the 27 articles included, 14 (52%) used prospective
cohorts. The global prevalence of NPS in MCI ranged from 35% to 85%. The most common behavioral symptoms were
depression, anxiety, and irritability. Hospital-based samples reported a higher global prevalence of NPS than population-based
studies; this discrepancy probably reflected differences in demographics, study setting, MCI diagnostic criteria, and behavioral
instruments used. Prospective studies showed that NPS, particularly depression, may represent risk factors for MCI or predictors
for the conversion of MCI to Alzheimer’s disease (AD). NPS are very prevalent in subjects with MCI, displaying a similar pattern
of symptoms compared to dementia and AD. Large cohort studies using standardized MCI criteria and behavioral instruments
are required to evaluate the prognostic role of NPS in MC
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