Search results for "Semi"
showing 10 items of 3894 documents
Somatosensory Deviance Detection ERPs and Their Relationship to Analogous Auditory ERPs and Interoceptive Accuracy
2022
Abstract. Automatic deviance detection has been widely explored in terms of mismatch responses (mismatch negativity or mismatch response) and P3a components of event-related potentials (ERPs) under a predictive coding framework; however, the somatosensory mismatch response has been investigated less often regarding the different types of changes than its auditory counterpart. It is not known whether the deviance detection responses from different modalities correlate, reflecting a general prediction error mechanism of the central nervous system. Furthermore, interoceptive functions have been associated with predictive coding theory, but whether interoceptive accuracy correlates with devian…
"…a počínal tušit, že s obrazy to tady nebude jednoduché." Ekfrastyczność (w) powieści "Cesta do pekel" Václava Vokolka
2019
The article analyses the novel Cesta do pekel written by Václav Vokolek – the Czech prose writer, poet and painter – through the usage of the intersemiotic translation strategies. The plot of the text can be characterized as the contamination of the physically plausible historic world (the construction of the railway in the middle of the 19th century) with the implausible one (the infernal story) according to Lubomír Doležel’s typology. Demonstrating the changes in the arts (the clash of romanticism with realism), the novelist sensitizes the reader to the drastic introversion into nature, as exemplifi ed by the urbanization processes in the north of the Czech Republic. At the same time, the…
Reconfigurable nonlinear response of dielectric and semiconductor metasurfaces
2021
Abstract Optically resonant dielectric and semiconductor metasurfaces are an emerging and promising area of nanophotonics and light–matter interaction at the nanoscale. Recently, active tuning of the linear response and nonlinear effects of these components has received an increasing amount of interest. However, so far these research directions have remained separated with only few sporadic works that study their combination beginning to appear in the literature. The evolution of nonlinear metasurfaces based on dielectric and semiconductor materials toward reconfigurable and dynamic components could potentially answer the demand of integrated on-chip components that realize essential functi…
Essere a dieta. Regimi alimentari e stili di vita
2020
Il libro è una riflessione sulla cultura dietetica della contemporeaneità attraverso un'analisi sociosemiotica di una serie di fenomeni: diete dimagranti, stili alimentari di nicchia, racconti di conversione al vegetarianismo, pubblicità di cibo per bambini, programmi televisivi sul dimagrimento, etichette dei prodotti alimentari, oggetti da cucina e da tavola, Il tutto preceduto da una ricognizione della storia della dietetica, dall'antichità ad oggi, e delle diverse concezioni dell'alimentazione, del corpo e della medicina che hanno caratterizzato l'approccio dell'uomo ai regimi alimentari come regimi di senso.
Regimi dietetici, regimi di senso. Diete dimagranti a confronto
2015
La dietetica non ha, come si può pensare, una dimensione strettamente individuale, soggettiva, legata al corpo del singolo e all’esercizio di regole alimentari. Essa è infatti al tempo stesso una pratica individuale e collettiva, corporea e sociale, che sconfina facilmente addirittura nella politica.
Semigenerated Carnot algebras and applications to sub-Riemannian perimeter
2021
This paper contributes to the study of sets of finite intrinsic perimeter in Carnot groups. Our intent is to characterize in which groups the only sets with constant intrinsic normal are the vertical half-spaces. Our viewpoint is algebraic: such a phenomenon happens if and only if the semigroup generated by each horizontal half-space is a vertical half-space. We call semigenerated those Carnot groups with this property. For Carnot groups of nilpotency step 3 we provide a complete characterization of semigeneration in terms of whether such groups do not have any Engel-type quotients. Engel-type groups, which are introduced here, are the minimal (in terms of quotients) counterexamples. In add…
Poikkeavuuksien havaitseminen WWW-palvelinlokidatasta
2011
Nykyajan web-palvelut ovat dynaamisia ja avoimia. Tämä antaa suurelle joukolle käyttäjiä mahdollisuuden päästä käsiksi palveluun ja sen sisältämään tietoon. Samalla avautuu uusia mahdollisuuksia toteuttaa hyökkäys. Tietoturvan pitäminen riittävällä tasolla on kilpailua aikaa vastaan. Poikkeavuuksien havaitsemisjärjestelmillä pystytään kuitenkin havaitsemaan ennestään tuntemattomat hyökkäykset ja muu epänormaali toiminta ja siten pitämään tietoturva hyvällä tasolla. Tutkimuksessa sovellettiin n-grammianalyysia, tukivektorikonetta ja diffuusiokarttoja esikäsitellyn verkkodatan analysointiin. Kaikilla menetelmillä saatiin lupaavia tuloksia, mutta reaaliaikainen järjestelmä vaatii vielä jatkoke…
Dimensionality reduction framework for detecting anomalies from network logs
2012
Dynamic web services are vulnerable to multitude of intrusions that could be previously unknown. Server logs contain vast amounts of information about network traffic, and finding attacks from these logs improves the security of the services. In this research features are extracted from HTTP query parameters using 2-grams. We propose a framework that uses dimensionality reduction and clustering to identify anomalous behavior. The framework detects intrusions from log data gathered from a real network service. This approach is adaptive, works on the application layer and reduces the number of log lines that needs to be inspected. Furthermore, the traffic can be visualized. peerReviewed
Using affinity perturbations to detect web traffic anomalies
2013
The initial training phase of machine learning algorithms is usually computationally expensive as it involves the processing of huge matrices. Evolving datasets are challenging from this point of view because changing behavior requires updating the training. We propose a method for updating the training profile efficiently and a sliding window algorithm for online processing of the data in smaller fractions. This assumes the data is modeled by a kernel method that includes spectral decomposition. We demonstrate the algorithm with a web server request log where an actual intrusion attack is known to happen. Updating the kernel dynamically using a sliding window technique, prevents the proble…
Digital pulse processing techniques for X-ray and gamma ray semiconductor detectors
2012
Digital pulse processing (DPP) systems, based on direct digitizing and processing of detector signals, have recently been favoured over analog electronics, ensuring higher flexibility, stability and lower dead time. We present our research activities on the development of X-ray and gamma ray spectrometers based on semiconductor detectors and DPP systems. We developed off-line and real-time DPP systems able to perform precise height and shape analysis of detector pulses. X-ray and gamma ray spectra measurements with cadmium telluride (CdTe) and germanium (Ge) detectors highlight the excellent performance of the systems both at low and high rate environments (up to 800 kcps).