Relevant bibliographies by topics / MLI synchrone

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  1. Journal articles

Academic literature on the topic 'MLI synchrone'

Author: Grafiati
Published: 4 April 2023

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Journal articles on the topic "MLI synchrone"

1

Handayani, Nita, Freddy Haryanto, Siti Nurul Khotimah, Idam Arif, and Warsito Purwo Taruno. "Coherence and phase synchrony analyses of EEG signals in Mild Cognitive Impairment (MCI): A study of functional brain connectivity." Polish Journal of Medical Physics and Engineering 24, no. 1 (2018): 1–9. http://dx.doi.org/10.2478/pjmpe-2018-0001.

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Abstract This paper presents an EEG study for coherence and phase synchrony in mild cognitive impairment (MCI) subjects. MCI is characterized by cognitive decline, which is an early stage of Alzheimer’s disease (AD). AD is a neurodegenerative disorder with symptoms such as memory loss and cognitive impairment. EEG coherence is a statistical measure of correlation between signals from electrodes spatially separated on the scalp. The magnitude of phase synchrony is expressed in the phase locking value (PLV), a statistical measure of neuronal connectivity in the human brain. Brain signals were recorded using an Emotiv Epoc 14-channel wireless EEG at a sampling frequency of 128 Hz. In this study, we used 22 elderly subjects consisted of 10 MCI subjects and 12 healthy subjects as control group. The coherence between each electrode pair was measured for all frequency bands (delta, theta, alpha and beta). In the MCI subjects, the value of coherence and phase synchrony was generally lower than in the healthy subjects especially in the beta frequency. A decline of intrahemisphere coherence in the MCI subjects occurred in the left temporo-parietal-occipital region. The pattern of decline in MCI coherence is associated with decreased cholinergic connectivity along the path that connects the temporal, occipital, and parietal areas of the brain to the frontal area of the brain. EEG coherence and phase synchrony are able to distinguish persons who suffer AD in the early stages from healthy elderly subjects.
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2

Dauwels, Justin, K. Srinivasan, M. Ramasubba Reddy, et al. "Slowing and Loss of Complexity in Alzheimer's EEG: Two Sides of the Same Coin?" International Journal of Alzheimer's Disease 2011 (2011): 1–10. http://dx.doi.org/10.4061/2011/539621.

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Medical studies have shown that EEG of Alzheimer's disease (AD) patients is “slower” (i.e., contains more low-frequency power) and is less complex compared to age-matched healthy subjects. The relation between those two phenomena has not yet been studied, and they are often silently assumed to be independent. In this paper, it is shown that both phenomena are strongly related. Strong correlation between slowing and loss of complexity is observed in two independent EEG datasets: (1) EEG of predementia patients (a.k.a. Mild Cognitive Impairment; MCI) and control subjects; (2) EEG of mild AD patients and control subjects. The two data sets are from different patients, different hospitals and obtained through different recording systems. The paper also investigates the potential of EEG slowing and loss of EEG complexity as indicators of AD onset. In particular, relative power and complexity measures are used as features to classify the MCI and MiAD patients versus age-matched control subjects. When combined with two synchrony measures (Granger causality and stochastic event synchrony), classification rates of 83% (MCI) and 98% (MiAD) are obtained. By including the compression ratios as features, slightly better classification rates are obtained than with relative power and synchrony measures alone.
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3

Dauwels, J., F. Vialatte, T. Weber, T. Musha, and A. Cichocki. "Quantifying Statistical Interdependence by Message Passing on Graphs—Part II: Multidimensional Point Processes." Neural Computation 21, no. 8 (2009): 2203–68. http://dx.doi.org/10.1162/neco.2009.11-08-899.

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Stochastic event synchrony is a technique to quantify the similarity of pairs of signals. First, events are extracted from the two given time series. Next, one tries to align events from one time series with events from the other. The better the alignment, the more similar the two time series are considered to be. In Part I, the companion letter in this issue, one-dimensional events are considered; this letter concerns multidimensional events. Although the basic idea is similar, the extension to multidimensional point processes involves a significantly more difficult combinatorial problem and therefore is nontrivial. Also in the multidimensional case, the problem of jointly computing the pairwise alignment and SES parameters is cast as a statistical inference problem. This problem is solved by coordinate descent, more specifically, by alternating the following two steps: (1) estimate the SES parameters from a given pairwise alignment; (2) with the resulting estimates, refine the pairwise alignment. The SES parameters are computed by maximum a posteriori (MAP) estimation (step 1), in analogy to the one-dimensional case. The pairwise alignment (step 2) can no longer be obtained through dynamic programming, since the state space becomes too large. Instead it is determined by applying the max-product algorithm on a cyclic graphical model. In order to test the robustness and reliability of the SES method, it is first applied to surrogate data. Next, it is applied to detect anomalies in EEG synchrony of mild cognitive impairment (MCI) patients. Numerical results suggest that SES is significantly more sensitive to perturbations in EEG synchrony than a large variety of classical synchrony measures.
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4

李, 颖琪. "Diachronic and Synchronic Research of “Hao Jiahuo”." Modern Linguistics 10, no. 01 (2022): 144–52. http://dx.doi.org/10.12677/ml.2022.101019.

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Schön, Sandra, Viktoria Wieser, Sebastian Dennerlein, and Martin Ebner. "Gute Online-Lehrpraxis aus Studierendensicht in den ersten Wochen der CoViD-19-Krise." MedienPädagogik: Zeitschrift für Theorie und Praxis der Medienbildung 40 (November 26, 2021): 411–29. http://dx.doi.org/10.21240/mpaed/40/2021.11.26.x.

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Ende Mai 2020 wurden die Studierenden der Technischen Universität Graz im Rahmen einer studentischen Qualifizierungsarbeit zu guten Lehrerfahrungen in der der Notfall-Online-Lehre durch die CoViD-19-Pandemie im Sommersemester 2020 befragt. 137 Beispiele für gute Lehre von unterschiedlichen Teilnehmenden werden für den Beitrag ausgewertet. Die Analyse der Antworten zeigen, dass in einem Gros der Lehrveranstaltungen die als gelungen erlebt wurden, (auch) Videotechnik zum Einsatz kommt (90 %), bei mehr als der Hälfte (auch) Videos zur Verfügung gestellt werden und bei der Hälfte Live-, d. h. synchrone Veranstaltungen angeboten werden. Ein wesentliches Merkmal für gute Lehrbeispiele ist, dass Studierende etwas gelernt haben (77 % «trifft voll zu») und bei Beschreibungen der Lehrbeispiele erwähnen rund ein Drittel, dass die Umstellung der Lehrveranstaltung, die sie als gute Lehre erlebten, zügig erfolgte. Methodisch-didaktische Besonderheiten werden damit in der frühen Phase des Distance Learning eher selten (12 %) von den befragten Studierenden benannt.
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6

顾, 菲. "Synchronic and Diachronic Research of the Synonyms “Fen” and “Shi”." Modern Linguistics 10, no. 04 (2022): 637–42. http://dx.doi.org/10.12677/ml.2022.104080.

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7

Dewi, M.Sc.St, Dr Kumala. "PENINGKATAN PERTUMBUHAN DAN ANTOSIANIN PADI HITAM (Oryza sativa ‘cempo ireng’) DENGAN PUPUK KANDANG." Agrin 23, no. 1 (2019): 63. http://dx.doi.org/10.20884/1.agrin.2019.23.1.425.

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Nowdays people tend to consume good healthy diets such as black rice. Black rice contain anthocyanin that acts as antioxidant. High demand of black rice in the market need to synchronize with high production that can be fulfil by fertilizer application. This research conducted to evaluated growth and yield of black rice ‘Cempo Ireng’ by cytokinin and manure application. Research was start in November 2015-Mei 2016 at Sangihe District. The treatment was arranged by dosage of manure 0, 5, 10, 15 ton ha-1 and incubated for two week. The results of this study showed that manure can affect the growth and yield of black rice.
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8

Lara, Carlos, Gonzalo S. Saldías, Bernard Cazelles, et al. "Climatic Regulation of Vegetation Phenology in Protected Areas along Western South America." Remote Sensing 13, no. 13 (2021): 2590. http://dx.doi.org/10.3390/rs13132590.

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Using 19 years of remotely sensed Enhanced Vegetation Index (EVI), we examined the effects of climatic variability on terrestrial vegetation of six protected areas along southwestern South America, from the semiarid edge of the Atacama desert to southern Patagonia (30°S–51°S). The relationship between satellite phenology and climate indices, namely MEI (Multivariate ENSO Index), PDO (Pacific Decadal Oscillation) and SAM (Southern Annular Mode) were established using statistical analyses for non-stationary patterns. The annual mode of phenological activity fluctuated in strength through time from the semiarid region to the border of southern Patagonia. Concomitantly, enhanced synchrony between EVI and climatic oscillations appeared over interannual cycles. Cross correlations revealed that variability in MEI was the lead predictor of EVI fluctuations over scales shorter than 4 months at lower latitudes and for the most poleward study site. The PDO was correlated with EVI over lags longer than 4 months at low latitude sites, while the SAM showed relationships with EVI only for sites located around 40°S. Our results indicate that the long-term phenological variability of the vegetation within protected areas along southwestern South America is controlled by processes linked to climate indices and that their influence varies latitudinally. Further studies over longer time scales will be needed to improve our understanding the impacts of climate change on vegetation condition and its effect over phenological variability.
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9

He, Fangmei, Youjun Li, Chenxi Li, Liming Fan, Tian Liu, and Jue Wang. "Repeated anodal high-definition transcranial direct current stimulation over the left dorsolateral prefrontal cortex in mild cognitive impairment patients increased regional homogeneity in multiple brain regions." PLOS ONE 16, no. 8 (2021): e0256100. http://dx.doi.org/10.1371/journal.pone.0256100.

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Transcranial direct current stimulation (tDCS) can improve cognitive function. However, it is not clear how high-definition tDCS (HD-tDCS) regulates the cognitive function and its neural mechanism, especially in individuals with mild cognitive impairment (MCI). This study aimed to examine whether HD-tDCS can modulate cognitive function in individuals with MCI and to determine whether the potential variety is related to spontaneous brain activity changes recorded by resting-state functional magnetic resonance imaging (rs-fMRI). Forty-three individuals with MCI were randomly assigned to receive either 10 HD-tDCS sessions or 10 sham sessions to the left dorsolateral prefrontal cortex (L-DLPFC). The fractional amplitude of low-frequency fluctuation (fALFF) and the regional homogeneity (ReHo) was computed using rs-fMRI data from all participants. The results showed that the fALFF and ReHo values changed in multiple areas following HD-tDCS. Brain regions with significant decreases in fALFF values include the Insula R, Precuneus R, Thalamus L, and Parietal Sup R, while the Temporal Inf R, Fusiform L, Occipital Sup L, Calcarine R, and Angular R showed significantly increased in their fALFF values. The brain regions with significant increases in ReHo values include the Temporal Inf R, Putamen L, Frontal Mid L, Precentral R, Frontal Sup Medial L, Frontal Sup R, and Precentral L. We found that HD-tDCS can alter the intensity and synchrony of brain activity, and our results indicate that fALFF and ReHo analysis are sensitive indicators for the detection of HD-tDCS during spontaneous brain activity. Interestingly, HD-tDCS increases the ReHo values of multiple brain regions, which may be related to the underlying mechanism of its clinical effects, these may also be related to a potential compensation mechanism involving the mobilization of more regions to complete a function following a functional decline.
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10

Ye, J., A. P. F. Flint, K. H. S. Campbell, and M. R. Luck. "Synchronization of porcine oocyte meiosis using cycloheximide and its application to the study of regulation by cumulus cells." Reproduction, Fertility and Development 14, no. 7 (2002): 433. http://dx.doi.org/10.1071/rd02037.

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This paper describes the use of the protein synthesis inhibitor cycloheximide (CHX) to synchronize nuclear progression during meiotic maturation in porcine oocytes, and also the time-dependence of nuclear maturation on exposure of the oocyte to cumulus cells. Prior to culture, the majority of oocytes were at the germinal vesicle (GV) stage (95–100%), but distributed from GVI to GVIV (GVI 56.1 ± 9.1%, GVII 15.3 ± 1.4%, GVIII 21.5 ± 7.1%, GVIV 7.1 ± 3.5%). During culture of cumulus-enclosed oocytes (COCs) from 12 h to 48 h in a conventional culture system, all meiotic stages were represented at any time point examined, with 63.6 ± 4.2% of oocytes maturing to metaphase II (MII). Cycloheximide blocked the progression of nuclear development in a dose-dependent manner. Treatment for 12 h with CHX at 1–25 μg mL–1 resulted in 95–100% oocytes being arrested and synchronized at GVII. With >5 μg mL–1 CHX, all oocytes were arrested before germinal vesicle breakdown (GVBD) (mostly at GVIII) by 24 h. A 12 h preincubation with 5 μg mL–1 CHX followed by 24 h of further culture without CHX resulted in >80% of oocytes maturing to MII. The profile of nuclear progression during maturation revealed discrete peaks of occurrence of different meiotic stages, with GVBD at 6–12 h, metaphase I (MI) at 10–18�h and anaphase I/telophase I at 16–20 h. After 12 h preincubation with 5 μg mL–1 CHX, denuded oocytes (DOs) matured to MI as COCs. However, DOs matured to MII as normal when denuded at MI. In conclusion, CHX not only efficiently blocks and synchronizes the meiotic progression of porcine oocytes at a specific GV stage, but it also effectively synchronizes subsequent meiotic progression to MII, resulting in discrete peaks of occurrence of different meiotic stages. Using this technique, the study showed that cumulus cells are essential for oocytes to mature from MI to MII but exposure to cumulus cells must occur before MI.
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