Search results for "Raf"

Miejsce frazeologii w słownikach gwarowych

2016

The aim of this article is to research the ways of developing phraseology and its emplacement into the macro- and microstructure in selected dialectal dictionaries (academic and popular). The first part is an overview of the phraseology, as included in introductions to the dictionaries. In the second part, using specific examples, the author discusses how the methodological and editorial assumptions adopted by dictionary authors/editors are followed in practice. The study of introductions and analysis of the lexical material reveal that in the absence of clearly framed methodological assumptions and detailed editorial guidelines on how to present phraseology in dialectal dictionaries, the q…

Adaptive framework for network traffic classification using dimensionality reduction and clustering

2012

Information security has become a very important topic especially during the last years. Web services are becoming more complex and dynamic. This offers new possibilities for attackers to exploit vulnerabilities by inputting malicious queries or code. However, these attack attempts are often recorded in server logs. Analyzing these logs could be a way to detect intrusions either periodically or in real time. We propose a framework that preprocesses and analyzes these log files. HTTP queries are transformed to numerical matrices using n-gram analysis. The dimensionality of these matrices is reduced using principal component analysis and diffusion map methodology. Abnormal log lines can then …

Online anomaly detection using dimensionality reduction techniques for HTTP log analysis

2015

Modern web services face an increasing number of new threats. Logs are collected from almost all web servers, and for this reason analyzing them is beneficial when trying to prevent intrusions. Intrusive behavior often differs from the normal web traffic. This paper proposes a framework to find abnormal behavior from these logs. We compare random projection, principal component analysis and diffusion map for anomaly detection. In addition, the framework has online capabilities. The first two methods have intuitive extensions while diffusion map uses the Nyström extension. This fast out-of-sample extension enables real-time analysis of web server traffic. The framework is demonstrated using …

Higher-order Nonnegative CANDECOMP/PARAFAC Tensor Decomposition Using Proximal Algorithm

2019

Tensor decomposition is a powerful tool for analyzing multiway data. Nowadays, with the fast development of multisensor technology, more and more data appear in higherorder (order > 4) and nonnegative form. However, the decomposition of higher-order nonnegative tensor suffers from poor convergence and low speed. In this study, we propose a new nonnegative CANDECOM/PARAFAC (NCP) model using proximal algorithm. The block principal pivoting method in alternating nonnegative least squares (ANLS) framework is employed to minimize the objective function. Our method can guarantee the convergence and accelerate the computation. The results of experiments on both synthetic and real data demonstrate …

Molecule-like photodynamics of Au102(pMBA)44 nanocluster.

2015

Photophysical properties of a water-soluble cluster Au102(pMBA)44 (pMBA = para-mercaptobenzoic acid) are studied by ultrafast time-resolved mid-IR spectroscopy and density functional theory calculations in order to distinguish between molecular and metallic behavior. In the mid-IR transient absorption studies, visible or near-infrared light is used to electronically excite the sample, and the subsequent relaxation is monitored by studying the transient absorption of a vibrational mode in the ligands. Based on these studies, a complete picture of energy relaxation dynamics is obtained: (1) 0.5-1.5 ps electronic relaxation, (2) 6.8 ps vibrational cooling, (3) intersystem crossing from the low…

Multi-hop D2D Communications with Network Coding : From A Performance Perspective

2019

Multi-hop device-to-device (D2D) communications play an important role in expanding D2D coverage. In this paper, we study a relay-based and network-coding-assisted (in particular, XOR coding) multi-hop D2D communication system. In the system, toward jointly considering the impact of interference and network traffic conditions on the quality of D2D communications, various channel fading models and traffic models are investigated, and the packet loss probability of D2D links is meticulously computed using these models. With the packet loss probability of D2D links, the general closed-form expressions of end-to-end packet loss probability (E2EPLP) of the system with the presence (or absence) o…

Does corn market uncertainty impact the US ethanol prices?

2018

The growing interest in biofuel as a green energy source has intensified the linkages between corn and ethanol markets, especially in the United States that represents the largest producing and exporting country for ethanol in the world. In this study, we examine the effect of corn market uncertainty on the price changes of US ethanol applying a set of GARCH-jump models. We find that the US ethanol price changes react positively to the corn market volatility shocks after controlling for the effect of oil price uncertainty. In addition, we document that the impact of corn price volatility on the US ethanol prices appears to be asymmetric. Specifically, only the positive corn market volatilit…

Negotiating female judoka identities in Greece : A Foucauldian discourse analysis

2015

Abstract Objectives The objectives of this paper are to trace the discourses through which female Greek judokas articulate their sporting experiences and to explore how they construct their identities through the negotiation of sociocultural beliefs and gender stereotypes. Design This article is based on interview data from a larger ethnographic research with women judo athletes, grounded in a cultural praxis framework. Method Ten semi-structured interviews were conducted during fieldwork in Greece. Interview data were analyzed drawing on a Foucauldian approach to discourse analysis. Results We identified four concepts—biology, gender, femininity, and judo/sport—that were central to unearth…

Taidemaailman ulkopuolella olemisen tapoja : graafikko M. C. Escherille kirjoitettu tila

2006

"Mä vaan tykkään jos tutkitaan eri asioita ja mä innostun niistä kaikista" : lasten käsityksiä tiede- ja teknologiakasvatusta, matematiikkaa ja taite…

2017

Tämän tutkimuksen tarkoituksena oli kuvata lasten käsityksiä ja kokemuksia päiväkodissa toteutetusta STEAM-toiminnasta. STEAM-pedagogiikka on uusi oppimismenetelmä, jossa integroidaan tieteen, teknologian, taiteen ja matematiikan oppisisältöjä ja toteutetaan tutkivaa toimintaa. Uusi varhaiskasvatussuunnitelman perusteet korostaa laaja-alaista osaamista, lasten osallisuutta ja leikin tärkeyttä. Nämä kaikki voidaan yhdistää pedagogiikassa tutkivan toiminnan ja STEAM-pedagogiikan avulla. Tutkimus toteutettiin laadullisena käyttäen fenomenografista otetta. Tutkimuksen aineisto kerättiin kolmesta keskisuomalaisesta päiväkodista, jotka osallistuivat keväällä 2016 toteutettuun STEAMing-pilotointii…