Search results for "Telecommunication"

All-optical regeneration of polarization of a 40 Gbit/s return-to-zero telecommunication signal

2013

International audience; We report all-optical regeneration of the state of polarization of a 40 Gbit/s return-to-zero telecommunication signal. The device discussed here consists of a 6.2-km-long nonzero dispersion-shifted fiber, with low polarization mode dispersion, pumped from the output end by a backward propagating wave coming from either an external continuous source or a reflection of the signal. An initially scrambled signal acquires a degree of polarization close to 100% toward the polarization generator output. All-optical regeneration is confirmed by means of polarization and bit-error-rate measurements as well as real-time observation of the eye diagrams. We show that the physic…

The Five-Pillar Model of Parties’ Migration into the Digital

2021

Scholars have examined how political parties cope with web-based technologies for about 20 years. This body of literature on party digitalisation covers many different aspects of parties’ migration into the digital, yet usually, the term digitalisation is used equally for all kinds of web-related changes in party behaviour and routines. This contribution distinguishes five key dimensions (pillars) of parties’ migration into the digital, which resonate with classic approaches of party research. These pillars cover (A) membership, (B) leaders and candidates, (C) policy program, (D) public image, and (E) resources. Each pillar consists of three bricks addressing sub-dimensions. This enables a …

Analysis of Pollutant Emissions on City Arteries—Aspects of Transport Management

2021

The aim of the study is to present a methodology for analyzing pollution emissions in a medium-sized city using modern traffic simulations in the aspect of minimizing exhaust emissions. The scope of the research and the methods of analysis used differ from those applied in big cities projects that can be found in the literature, Therefore the progressive elaboration model has been applied methodically to formulate and carry out the feasibility study. To perform microscopic traffic simulations, the software Simulation of Urban Mobility (SUMO—German Aerospace Center (DLR), Berlin, Germany) was applied. Thanks to the simulations, changes in traffic organization were accurately identified in th…

Polypeptoid-block-polypeptide Copolymers: Synthesis, Characterization, and Application of Amphiphilic Block Copolypept(o)ides in Drug Formulations an…

2013

We report the synthesis of polysarcosine-block-polyglutamic acid benzylester (PSar-block-PGlu(OBn)) and polysarcosine-block-polylysine-ε-N-benzyloxycarbonyl (PSar-block-PLys(Z)) copolymers. The novel polypeptoid-block-polypeptide copolymers (Copolypept(o)ides) have been synthesized by ring-opening polymerization (ROP) of N-carboxyanhydrides (NCAs). Polymerization conditions were optimized regarding protecting groups, block sequence and length. While the degree of polymerization of the PSar block length was set to be around 200 or 400, PGlu(OBn) and PLys(Z) block lengths were varied between 20 to 75. The obtained block copolymers had a total degree of polymerization of 220-475 and dispersity…

Non-separable local polynomial regression cell-average multiresolution operators. Application to compression of images

2016

Abstract Cell-average multiresolution Harten׳s algorithms have been satisfactorily used to compress data. These schemes are based on two operators: decimation and prediction. The accuracy of the method depends on the prediction operator. In order to design a precise function, local polynomial regression has been used in the last years. This paper is devoted to construct a family of non-separable two-dimensional linear prediction operators approximating the real values with this procedure. Some properties are proved as the order of the scheme and the stability. Some numerical experiments are performed comparing the new methods with the classical linear method.

A discussion of potential exposure metrics for use in epidemiological studies on human exposure to radiowaves from mobile phone base stations

2000

There is currently a high level of concern in many countries that exposure to radiowaves from mobile phone base stations may be hazardous to health. When investigating such suggested risks, epidemiologists need to define an exposure metric that can reliably discriminate between exposed and unexposed groups of people. We conducted a feasibility study to investigate if either short-term measurements of electric field strength, calculations of electric field strength, or distance from nearby mobile phone base stations could be used to develop a metric reflecting an individual's exposure to radiowaves. With electric field strengths in the range of 0.012-0.343 V/m, radiowaves from mobile phone b…

Integration of WiFi ToF Positioning System in the Open, Flexible and Adaptive WiSHFUL Architecture

2017

We integrate a prototypeWiFi Time-of-Flight (ToF) ranging and positioning system in the WiSHFUL software platforms and hardware radios for experimental prototyping. Users have access to ToF measurements as well as computed positions through unified programming interfaces that make possible to investigate innovative positioning and networking solutions. TRUE pub

Evolution of strategy narration and leadership work in the digital era

2019

This paper examines the evolution of strategy narration, contributing to ongoing discussions in this field. Our empirical data, gathered from a large Finnish co-operative bank, cover three decades. According to our findings, digitalisation has brought about an epoch change in strategy narration, as top management has strongly adopted digital media in their leadership work, which has replaced ‘traditional’ face-to-face strategy meetings and public presentations by gatherings on digital platforms, including webcasting, intranet and Skype. This has brought about a leadership vacuum, and left organisational members long for their superiors to ‘exercise’ some traditional leadership practices, su…

Virastosta liikeyritys : posti- ja telelaitoksen muutosprosessi 1930-1994

2014

Introduction: power – invisible architecture of education

2015

Looking at the focus of power, the entire history of society, in the past and present, can be explained as changes and interactions of power relations or networks of power and power play.1 Westwood...