2,918 research outputs found
Fractal Fluctuations and Quantum-Like Chaos in the Brain by Analysis of Variability of Brain Waves: A New Method Based on a Fractal Variance Function and Random Matrix Theory
We developed a new method for analysis of fundamental brain waves as recorded
by EEG. To this purpose we introduce a Fractal Variance Function that is based
on the calculation of the variogram. The method is completed by using Random
Matrix Theory. Some examples are given
MATNet: Multi-Level Fusion and Self-Attention Transformer-Based Model for Multivariate Multi-Step Day-Ahead PV Generation Forecasting
The integration of renewable energy sources (RES) into modern power systems
has become increasingly important due to climate change and macroeconomic and
geopolitical instability. Among the RES, photovoltaic (PV) energy is rapidly
emerging as one of the world's most promising. However, its widespread adoption
poses challenges related to its inherently uncertain nature that can lead to
imbalances in the electrical system. Therefore, accurate forecasting of PV
production can help resolve these uncertainties and facilitate the integration
of PV into modern power systems. Currently, PV forecasting methods can be
divided into two main categories: physics-based and data-based strategies, with
AI-based models providing state-of-the-art performance in PV power forecasting.
However, while these AI-based models can capture complex patterns and
relationships in the data, they ignore the underlying physical prior knowledge
of the phenomenon. Therefore, we propose MATNet, a novel self-attention
transformer-based architecture for multivariate multi-step day-ahead PV power
generation forecasting. It consists of a hybrid approach that combines the AI
paradigm with the prior physical knowledge of PV power generation of
physics-based methods. The model is fed with historical PV data and historical
and forecast weather data through a multi-level joint fusion approach. The
effectiveness of the proposed model is evaluated using the Ausgrid benchmark
dataset with different regression performance metrics. The results show that
our proposed architecture significantly outperforms the current
state-of-the-art methods with an RMSE equal to 0.0460. These findings
demonstrate the potential of MATNet in improving forecasting accuracy and
suggest that it could be a promising solution to facilitate the integration of
PV energy into the power grid
Cognitive behavioral group therapy versus psychoeducational intervention in Parkinson's disease
Objective: The aim of the current study was to evaluate whether cognitive behavioral group therapy has a positive impact on psychiatric, and motor and non-motor symptoms in Parkinson’s disease (PD).
Methods: We assigned 20 PD patients with a diagnosis of psychiatric disorder to either a 12-week cognitive behavioral therapy (CBT) group or a psychoeducational protocol. For the neurological examination, we administered the Unified Parkinson’s Disease Rating Scale and
the non-motor symptoms scale. The severity of psychiatric symptoms was assessed by means of the Hamilton Depression Rating Scale, the Hamilton Anxiety Rating Scale, the Brief Psychiatric Rating Scale, and the Clinical Global Impressions. Results: Cognitive behavioral group therapy was effective in treating depression and anxiety symptoms as well as reducing the severity of non-motor symptoms in PD patients; whereas, no changes were observed in PD patients treated with the psychoeducational protocol. Conclusion: CBT offered in a group format should be considered in addition to standard drug therapy in PD patient
Voluntary movement takes shape. the link between movement focusing and sensory input gating
The aim of the study was to investigate the relationship between motor surround inhibition (mSI) and the modulation of somatosensory temporal discrimination threshold (STDT) induced by voluntary movement. Seventeen healthy volunteers participated in the study. To assess mSI, we delivered transcranial magnetic stimulation (TMS) single pulses to record motor evoked potentials (MEPs) from the right abductor digiti minimi (ADM; “surround muscle”) during brief right little finger flexion. mSI was expressed as the ratio of ADM MEP amplitude during movement to MEP amplitude at rest. We preliminarily measured STDT values by assessing the shortest interval at which subjects were able to recognize a pair of electric stimuli, delivered over the volar surface of the right little finger, as separate in time. We then evaluated the STDT by using the same motor task used for mSI. mSI and STDT modulation were evaluated at the same time points during movement. mSI and STDT modulation displayed similar time-dependent changes during index finger movement. In both cases, the modulation was maximally present at the onset of the movement and gradually vanished over about 200 ms. Our study provides the first neurophysiological evidence about the relationship between mSI and tactile-motor integration during movement execution
Abnormal temporal coupling of tactile perception and motor action in Parkinson's disease
Evidence shows altered somatosensory temporal discrimination threshold (STDT) in Parkinson's disease in comparison to normal subjects. In healthy subjects, movement execution modulates STDT values through mechanisms of sensory gating. We investigated whether STDT modulation during movement execution in patients with Parkinson's disease differs from that in healthy subjects. In 24 patients with Parkinson's disease and 20 healthy subjects, we tested STDT at baseline and during index finger abductions (at movement onset "0", 100, and 200 ms thereafter). We also recorded kinematic features of index finger abductions. Fifteen out of the 24 patients were also tested ON medication. In healthy subjects, STDT increased significantly at 0, 100, and 200 ms after movement onset, whereas in patients with Parkinson's disease in OFF therapy, it increased significantly at 0 and 100 ms but returned to baseline values at 200 ms. When patients were tested ON therapy, STDT during index finger abductions increased significantly, with a time course similar to that of healthy subjects. Differently from healthy subjects, in patients with Parkinson's disease, the mean velocity of the finger abductions decreased according to the time lapse between movement onset and the delivery of the paired electrical stimuli for testing somatosensory temporal discrimination. In conclusion, patients with Parkinson's disease show abnormalities in the temporal coupling between tactile information and motor outflow. Our study provides first evidence that altered temporal processing of sensory information play a role in the pathophysiology of motor symptoms in Parkinson's disease
Effect of Fiber Information on Consumer's Expectation and Liking of Wheat Bran Enriched Pasta
Volatile organic compound data of ready-to-cook tuna fish-burgers: Time evolution in function of different and/or combined mild preservation technologies and relevant statistical analysis
Volatile organic compound (VOC) composition from ready-to-cook tuna fish-burgers, prepared with and without a protective microbial strain (Lactobacillus paracasei) and/or stored with modified atmosphere packaging (MAP, 5% O2 and 95% CO2), were extracted by headspace solid-phase microextraction and analyzed by gas chromatography-mass spectrometry (HS-SPME-GC-MS) during the burger shelf-life. The collected data showed volatile composition profiles in function of the mild preservation technologies employed and the storage time. Furthermore, statistical data treatment (principal component analysis and Pearson's coefficients) highlighted differences among samples and positive/negative correlations during the storage time. This paper is related to an article already published in LWT (Investigating the effects of mild preservation technology on perishable foods by volatolomics: The case study of ready-to-cook tuna-burgers” https://doi.org/10.1016/j.lwt.2019.108425)
- …