Search results for "LESS"
showing 10 items of 2452 documents
Representation of Latvian Mithology in works of Hilda Vika
2013
The paper includes the study on activities of the Latvian painter and writer Hilda Vika - Eglīte (1897-1963) in the field of visual art (mostly painting) connected with Latvian mythology. Latvian myth characters and themes came into H. Vika’s creative work after 1930 when she married writer and reviewer Viktors Eglitis and resorted to “Dievturība” (Latvian Neopagan religious movement based on folklore, old folk songs and mythology). Actively and productively working H. Vika participated in numerous group art exhibitions. Her individual vision, decorative solutions of composition and stylized details brought in Latvian painting unusual and essentially different intonations being contemporary…
Chaoskampf in the orthodox baptism ritual
2018
The present article analyses the occurrence of the Chaoskampf motif in the Orthodox Baptism ritual and its biblical and Near-Eastern backgrounds. Such statements are direct references to Old and New Testament texts in which water has negative connotations, being associated with hostile or chaotic aspects of existence. In the baptismal interpretation of the biblical motif, sea, depths and dragons are figurative names for demons. The liturgical reinterpretation of these biblical references is the preamble of the baptismal exorcisms. Biblical texts about the struggle against chaos were included in the ritual in order to illustrate Christ's supremacy over all hostile forces subduing man before …
LoRa Technology Demystified: From Link Behavior to Cell-Level Performance
2020
In this paper we study the capability of LoRa technology in rejecting different interfering LoRa signals and the impact on the cell capacity. First, we analyze experimentally the link-level performance of LoRa and show that collisions between packets modulated with the same Spreading Factor (SF) usually lead to channel captures, while different spreading factors can indeed cause packet loss if the interference power is strong enough. Second, we model the effect of such findings to quantify the achievable capacity in a typical LoRa cell: we show that high SFs, generally seen as more robust, can be severely affected by inter-SF interference and that different criteria for deciding SF allocati…
A Green Mesh Routers' Placement to Ensure Small Cells Backhauling in 5G Networks
2017
International audience; The wireless industry is preparing the fifth generation wireless systems with several requirements regarding capacity and coverage area. A promising solution to meet this challenge is a densification of the network via a large scale deployment of small cells from different sizes. The advantage here is that small cells are easy to deploy and cost-efficient compared to macro base stations. However, the challenge is to ensure a reliable backhaul links. Mesh routers backhauling is one of the candidate solutions here, since it is easy to deploy, doesn't use wired connections between locations and cost-efficient. Nevertheless, the issue is to deploy routers in the suitable…
A Novel Approach for Faulty Sensor Detection and Data Correction in Wireless Sensor Network
2013
he main Wireless Sensor Networks purpose is represented by areas of interest monitoring. Even if the Wireless sensor network is properly initialized, errors can occur during its monitoring tasks. The present work describes an approach for detecting faulty sensors in Wireless Sensor Network and for correcting their corrupted data. The approach is based on the assumption that exist a spatio-temporal cross- correlations among sensors. Two sequential mathematical tools are used. The first stage is a probabilistic tools, namely Markov Random Field, for a two-fold sensor classification (working or damaged). The last stage is represented by the Locally Weighted Regression model, a learning techniq…
La logica e il mito del linguaggio perfetto
2014
L'articolo sostiene che il sogno di una "linguaggio perfett", inteso come un mezzo di espressione universale e semanticamente trasparente sia strettamente connesso al mito della razionalità istantanea. Il linguaggio logicamente perfetto sarebbe infatti un linguaggio nel quale tutte le relazioni logiche divengono immediatamente visibili, e la questa linguaggio, possa pensare per noi (frege, 1884). nella prima parte dell'articolo si ricostruisce la storia di questo tipo di linguaggio perfetto da Leibniz e Wittgenstein. nella seconda parte si mostra come tale linguaggio non possa esistere sulla base di recenti risultati in logica e computer science. We argue that the dream of a ‘perfect langua…
Lossless and near-lossless image compression based on multiresolution analysis
2013
There are applications in data compression, where quality control is of utmost importance. Certain features in the decoded signal must be exactly, or very accurately recovered, yet one would like to be as economical as possible with respect to storage and speed of computation. In this paper, we present a multi-scale data-compression algorithm within Harten's interpolatory framework for multiresolution that gives a specific estimate of the precise error between the original and the decoded signal, when measured in the L"~ and in the L"p (p=1,2) discrete norms. The proposed algorithm does not rely on a tensor-product strategy to compress two-dimensional signals, and it provides a priori bound…
The Engineering of a Compression Boosting Library: Theory vs Practice in BWT Compression
2006
Data Compression is one of the most challenging arenas both for algorithm design and engineering. This is particularly true for Burrows and Wheeler Compression a technique that is important in itself and for the design of compressed indexes. There has been considerable debate on how to design and engineer compression algorithms based on the BWT paradigm. In particular, Move-to-Front Encoding is generally believed to be an "inefficient " part of the Burrows-Wheeler compression process. However, only recently two theoretically superior alternatives to Move-to-Front have been proposed, namely Compression Boosting and Wavelet Trees. The main contribution of this paper is to provide the first ex…
From First Principles to the Burrows and Wheeler Transform and Beyond, via Combinatorial Optimization
2007
AbstractWe introduce a combinatorial optimization framework that naturally induces a class of optimal word permutations with respect to a suitably defined cost function taking into account various measures of relatedness between words. The Burrows and Wheeler transform (bwt) (cf. [M. Burrows, D. Wheeler, A block sorting lossless data compression algorithm, Technical Report 124, Digital Equipment Corporation, 1994]), and its analog for labelled trees (cf. [P. Ferragina, F. Luccio, G. Manzini, S. Muthukrishnan, Structuring labeled trees for optimal succinctness, and beyond, in: Proc. of the 45th Annual IEEE Symposium on Foundations of Computer Science, 2005, pp. 198–207]), are special cases i…
Statistical Modeling of Huffman Tables Coding
2005
An innovative algorithm for automatic generation of Huffman coding tables for semantic classes of digital images is presented. Collecting statistics over a large dataset of corresponding images, we generated Huffman tables for three images classes: landscape, portrait and document. Comparisons between the new tables and the JPEG standard coding tables, using also different quality settings, have shown the effectiveness of the proposed strategy in terms of final bit size (e.g. compression ratio).