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1.
Work-Home conflict and strain: the role of work-related smartphone use, job insecurity and segmentation preferences
Tjaša Srnko, 2018, magistrsko delo

Opis: Nowadays, through organisational and technological changes, organizations expect availability and work from their employees not just during working hours, but also in their free time. Work can be done from anywhere and at any time, also with the help of smartphones, which is one of the main constructs of the current research. If the employee is working from home on their smartphone, this can have an important contribution to managing work and private life, and also to strain. The individual’s preference of whether to segment his or her work from home also plays an important role in experiencing internal conflicts. As the motivation for work-related smartphone use is not fully clear, job insecurity was additionally explored as a potential predictor. In an online study, conducted in Austria, we collected data from 454 participants of different ages, gender and working backgrounds. For the analysis, multiple moderated regression and mediation analyses were used. Results showed significant relations between work-home interference and strain but no significant results between those constructs while adding work-related smartphone use. Segmentation preferences did not have an influence on the relationship between work-home interference and strain. Job insecurity was revealed to be related to work-related smartphone use and smartphone use to work-home interference. Smartphone use was also found to partially mediate the path from job insecurity to work-home interference. Finally, to prevent negative outcomes of strain, work-home interference and job insecurity, organizations should focus on: providing culture that fits their employees, try to plan availability free time and provide a clear communication.
Ključne besede: Smartphone use, work-home interference, strain, stress, job insecurity, segmentation preferences
Objavljeno v DKUM: 14.01.2019; Ogledov: 1085; Prenosov: 111
.pdf Celotno besedilo (863,72 KB)

2.
The "magnet effect" - a powerful source of L1 dialect interference in the pronunciation of English as a foreign language
Klementina Penelope Jurančič, 2014, izvirni znanstveni članek

Opis: Wieden and Nemser (1991) carried out a study investigating the development of pronunciation of English as a foreign language in Austria. One of the main issues in this research was L1 dialect interference. Individual studies have proven that the pronunciation of a second (L2) or foreign language (FL) is not influenced only by the standard variety of the first language (L1), but also by the L1 dialect of the speaker's place of origin (Karpf et al. 1980). Wieden and Nemser's study wished to prove this on a larger scale. A similar study was carried out also for Slovenia (Jurančič Petek 2007). Contrastive analysis (CA) of the Slovene Standard pronunciation and English was performed as well as that of the sound systems of individual Slovene dialects and the English one. Error analysis (EA) of the obtained results showed that L1 dialect interference did not occur in the instances predicted by contrastive analysis; however the study in itself did prove the existence of such influence ("magnet effect" in vowels).
Ključne besede: English language, magnet effect, monophthongs, dialect interference, pronunciation, L1 dialect interference, pronunciation of English
Objavljeno v DKUM: 16.05.2017; Ogledov: 745; Prenosov: 147
.pdf Celotno besedilo (338,64 KB)
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3.
ERROR PROBABILITY MODEL FOR IEEE 802.15.4 WIRELESS TRANSMISSION WITH CO-CHANNEL INTERFERENCE AND BACKGROUND NOISE
Uroš Pešović, 2016, doktorska disertacija

Opis: Data transmission sent through wireless channel is usually affected by background noise, multipath fading and interference which cause data errors. Influence of such disturbances is the most commonly expressed in a form of error probability statistics. Effects of these disturbances on IEEE 802.15.4 wireless transmissions are previously studied, except influence of co-channel interference (CCI) which originates from collision between IEEE 802.15.4 devices which perform simultaneous radio transmission. Our thesis puts forward the assumption that it is possible to derive more accurate analytical error probability model for higher data level error probability parameters without the idealization of PN spreading sequences. Additionally, thesis is that is possible to derive an accurate analytical error probability model in the case of CCI influenced by background noise by consideration of constellation diagram. IEEE 802.15.4 standard uses CSMA/CA (Carrier Sense Multiple Access with Collision Detection) channel access mechanism to prevent collisions between devices, but this mechanism doesn't provide protection from hidden node problem which is primary source of co-channel interference. Using Monte Carlo simulations we determined frequency of hidden node collisions, which shown that co-channel interference frequently occur in parts of the network with high traffic load. Some prior works in this field tend to idealize these non-ideal spreading sequences in order to simplify calculations for error probability parameters. Our doctor thesis presents analytical model of data level error probability parameters (symbol, bit and packet) for IEEE 802.15.4, which uses original non-ideal spreading sequences without their idealization. Proposed error probability model consists of mutually dependent chip, symbol, bit and packet error probability models. Derived error probability models are linked together, so each of error probability parameters can be determined using error probability parameter from the previous stage. Error probability model for IEEE 802.15.4 wireless communication could be used in network simulation tools in order to accurately simulate energy efficient medium access protocols in realistic scenarios. Presented theoretical results are tested by independent numerical simulation of IEEE 802.15.4 transmission according to Monte Carlo method. Simulation results shows that derived models for error probability parameters were matched by two simulation scenarios in background noise, for multipath fading and co-channel interface, respectively Furthermore, the accuracy of derived mathematical models was tested in real-world experiment using IEEE 802.15.4 compliant wireless transceivers for creating co-channel interference. Packets were received by software defined radio platform, which enabled realization of coherent receiver in which all error probability statistics could be collected. The results of the experiment show consistency with proposed analytical error probability models, but some deviations are caused by poor preamble synchronization under low SNR (Signal to Noise Ratio) value. The thesis was proved with Monte Carlo simulations of the physical level of the IEEE 802.15.4 communication and experimental measurements on a real physical communication system.
Ključne besede: IEEE 802.15.4 standard, error probability model, co-channel interference, Rician fading channel, additive white Gaussian noise, wireless transmission, wireless sensor networks, numerical simulations, software defined radio
Objavljeno v DKUM: 14.10.2016; Ogledov: 1830; Prenosov: 99
.pdf Celotno besedilo (8,20 MB)

4.
Karakterizacija in uporaba optičnih senzorjev za on - line in in - situ merjenje plinov v biotehnoloških procesih
Polonca Brglez, 2013, doktorska disertacija

Opis: Doktorska disertacija je razdeljena na več sklopov, v katerih smo poskušali poglobiti dosedanje raziskave na področju optičnega senzorja kisika na osnovi 4,7 - difenil - 1,10 - fenantrolin rutenijevega(II) diklorid kompleksa - (Ru(dpp)3). Namen doktorskega dela je bila izboljšava optičnih lastnosti in odziva senzorjev na osnovi Ru(dpp)3. Lastnosti senzorja smo dodatno raziskali s poudarkom na preučevanju različnih tehnik izdelave senzorjev, spreminjanja koncentracij barvila, aplikacije različnih polimernih nosilcev, vpliva potencialnih interferenčnih plinov in vključevanja nanodelcev. Izdelali smo tankoslojne optične senzorje kisika s pomočjo različnih tehnik nanosa senzorskih raztopin (»spin coating« tehnike, s pomočjo naprave za tanke nanose in s pomočjo mehanskega nanosa). Namen je bil pripraviti najbolj homogen nanos senzorske raztopine in tako dobiti najbolj optimalne lastnosti senzorjev. Nanašanje senzorske raztopine s pomočjo mehanskega nanosa je enostavna in cenovno najbolj ugodna tehnika. Vendar se ta tehnika ni izkazala kot najprimernejša, saj je težko zagotoviti popolnoma homogen nanos po celotni senzorski površini. Ugotovili smo, da je glavna prednost uporabe »spin coating-a« ta, da je tehnika hitra, enostavna za uporabo in primerna za nanos majhnih volumnov. Omogoča izdelavo več serij senzorjev z različnimi lastnostmi ob minimalni porabi reagentov. »Spin coating« se je izkazal kot učinkovita metoda za nanos senzorskih raztopin v laboratorijskem merilu, vendar je po celotni senzorski površini težko pripraviti popolnoma homogen nanos (150 µL senzorske raztopine, 80 mg Ru(dpp)3, kloroform, silikon E41, folija Dataline, program na »Spin coater-ju«: 1. korak: 750 obr.  3 s, 2. korak: 300 obr.  3 s in 3. korak: 150 obr.  3 s). Kot najprimernejša tehnika za nanos senzorskih raztopin se je izkazala metoda nanosa senzorske raztopine s pomočjo naprave za tanke nanose, kjer smo nanašali senzorske raztopine v debelini: 10 µm, 15 µm, 20 µm, 25 µm, 30 µm, 40 µm in 50 µm. Ta način izdelave omogoča najbolj homogen nanos senzorske raztopine, postopek je hiter, enostaven in omogoča izdelavo večjih količin senzorjev s ponovljivimi lastnostmi. Ugotovili smo, da so se z dodajanjem različnih kovinskih nanodelcev in Triton - X, karakteristike senzorjev izboljšale. Pri uporabi senzorjev v realnih pogojih smo spremljali vsebnost kisika med postopkom biološke razgradnje, kjer imajo elektrokemijski senzorji omejitve. Elektrode iz plemenitih kovin, ki reagirajo s korozivnimi plini, zato niso primerne za tovrstne aplikacije. S pomočjo optičnega senzorja kisika na osnovi Ru(dpp)3 smo spremljali koncentracijo kisika pri razgradnji organskih odpadkov; le-ta je ključnega pomena pri proizvodnji komposta. Študirali smo tudi razgradnjo mešanih organskih odpadkov s pomočjo mikroorganizmov v avtomatskem kompostniku, ki je učinkovitejši način, v kolikor se odločimo za kompostiranje na domu. Za optimalno delovanje avtomatskega kompostnika so potrebne še dodatne študije, ki bodo vključevale drugačne pogoje kompostiranja (različne substrate in mešanice substratov, selekcionirane mikroorganizme, spremljanje nastanka plinov itd.). Tretjo uporabnost razvitega senzorja smo preizkusili na področju meritev sestave bioplina. Merjenja, ki se lahko izvajajo on-line ali in-situ nam lahko povedo bistveno več o samem procesu in tako dajejo možnost vplivanja ter optimizacije procesa nastanka bioplina. Z merjenjem koncentracije kisika v pilotnem bioreaktorju smo dokazali, da je optični senzor kisika primeren tudi za merjenje kisika v bioplinu. Senzor ima sledeče prednosti: je enostaven za uporabo in omogoča meritve v vodi ali v plinskih fazi, je eksplozijsko varen in z njim lahko izvajamo meritve v vrtinah, kjer je podtlak ali nadtlak.
Ključne besede: 4, 7 - difenil-1, 10-fenantrolin rutenijev(II) diklorid kompleks, optični senzor kisika, spin coating, kisik, bioplin, interference, mešalna komora, kompost, mešanje plinov, nanodelci
Objavljeno v DKUM: 29.11.2013; Ogledov: 2392; Prenosov: 223
.pdf Celotno besedilo (4,84 MB)

5.
Improved frequency characteristics of the randomized PWM boost rectifier
Franc Mihalič, Miro Milanovič, Carlos Cuoto, 2003, izvirni znanstveni članek

Opis: A randomized pulse width modulation (RPWM) algorithm is applied in the control unit of the boost rectifier to achieve improved frequency characteristics in the wide band. First, the introduction of the RPWM switching is reflected in a smaller increase of the total harmonic distortion (THD) factor in the input current. Nevertheless, decrease of the power factor is negligibly small. Second, the power spectrum density (PSD) of the input current is estimated and measured to evaluate the influence of randomization in the high-frequency range. This approach offers an effective and credible prediction method for reduction of conductive electromagnetic interference (EMI) by using the RPWM switching.
Ključne besede: rectifiers, boost rectifiers, randomized pulse width modulation, estimation methods, total harmonic distortion, power factor, conductive electromagnetic interference
Objavljeno v DKUM: 01.06.2012; Ogledov: 1842; Prenosov: 76
URL Povezava na celotno besedilo

6.
Učenje slovenskega jezika kot tujega jezika (na Filozofski fakulteti Karlove univerze v Pragi)
Alja Bizjak, 2009, diplomsko delo

Opis: Lektorati slovenščine delujejo na 54 univerzah po svetu. Slovenistični študijski programi potekajo na mnogih univerzah po celem svetu, število slovenističnih kateder pa se vsako leto povečuje. Karlova univerza v Pragi je bila ustanovljena leta 1348 in je najstarejša ter največja univerza na Češkem. Lektorat slovenskega jezika je bil na Filozofski fakulteti Karlove univerze ustanovljen leta 1914 in je najstarejši med lektorati slovenščine na tujih univerzah. Dokazani stiki med narodoma so se začeli že v 14. stoletju – v času kulturnega razcveta Prage – in se nadaljevali v renesansi ter dobi protestantizma. Izjemno pomembno vlogo so imeli kulturni stiki med Slovenci in Čehi predvsem v dobi narodnega prebujenja (konec 18. in začetek 19. stoletja) ter se vsesplošno razmahnili v 19. in začetku 20. stoletja. Med slovanskimi jeziki obstajajo številne podobnosti in razlike. Zaradi tega med češkimi študenti, ki študirajo slovenščino, zelo pogosto prihaja do jezikovnega prenosa oz. vplivanja lastnosti njihovega prvega oz. maternega jezika (češčina) na potek učenja tujega jezika (slovenščina). V raziskavo o pisnem in ustnem izražanju študentov je vključenih 7 študentov 4. letnika slovenistike na Filozofski fakulteti Karlove univerze v Pragi. Narejena je bila analiza, razvrstitev odstopov od norme po kategorijah; prikazani so najbolj značilni zgledi za vsako vrsto jezikovne interference.
Ključne besede: jezikovne interference, češko-slovenski kulturni stiki, Karlova univerza v Pragi, lektorati slovenščine v tujini
Objavljeno v DKUM: 13.08.2009; Ogledov: 3181; Prenosov: 295
.pdf Celotno besedilo (549,27 KB)

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