| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Search the digital library catalog Help

Query: search in
search in
search in
search in
* old and bologna study programme

Options:
  Reset


1 - 10 / 15
First pagePrevious page12Next pageLast page
1.
2.
Language evolution from the cultural aspect
Ana Pejković, 2011, undergraduate thesis

Abstract: Language is the primary force of human social life. It is the most important characteristic that separates humans from animals. The question of language evolution has not yet been completely answered, despite several theories dealing with this subject. In my graduation thesis I deal with language evolution from the cultural aspect. First I present the process of evolution, focusing on cultural evolution – the transfer of cultural patterns in social community. I deal with different language definitions, presented by Sverker Johansson, and the reasons for its evolution. The chapter on language definitions is completed by presenting the cradle of language, which is Africa. When focusing on language evolution from the cultural aspect, it is necessary to present the theory of cultural transmission by Michael Tomasello. He believed that this is the only biological mechanism that could have caused changes in cognition and behaviour. Finally, I present the question of inseparability of language and culture.
Keywords: evolution, language, gestures, culture, cultural transmission
Published: 27.02.2012; Views: 997; Downloads: 70
.pdf Full text (378,87 KB)

3.
In-line higher order mode filters based on long highly uniform fiber tapers
Denis Đonlagić, 2006, original scientific article

Abstract: This paper presents a simple and effective design of taper-based higher order mode (HOM) filters that can effectively remove HOMs from the few-mode fibers. For this purpose, a taper manufacturing technique that allows the production of long and highly uniform tapers was developed. A filter performance was demonstrated on a standard single-mode telecommunication fiber operating at 850 nm. The HOM suppression was better than$-$39 dB, and the insertion loss ofthe fundamental mode was less than 0.15 dB.
Keywords: optical fibres, few moded fiber, fiber design, mode conversion, mode filter, noise figure, optical fiber dispersion, optical signal to noise, optical transmission systems, taper
Published: 31.05.2012; Views: 1312; Downloads: 69
URL Link to full text

4.
5.
A low bending loss multimode fiber transmission system
Denis Đonlagić, 2009, original scientific article

Abstract: This paper presents a high bend tolerant multimode optical fiber transmission system that is compatible with standard 50 ìm graded index multimode fiber, interms of achievable bandwidth and interconnectivity losses. When the 10 loops of the proposed bend resistive multimode fiber were wrapped around a cylinder of 1.5 mm radius, bend losses below -0.2 dB were achieved in case of experimentally produced fiber. Furthermore, when the section of the proposed bend resistive fiber was inserted between two sections of a standard 50 ìm graded index multimode fiber, the total experimental measured loss proved to be below -0.15 dB.
Keywords: optical fiber transmission systems, bending loss, bend resistive multimode fiber, optical communications, fiber optics
Published: 31.05.2012; Views: 1249; Downloads: 62
URL Link to full text

6.
Flexible test stands based on LabVIEW
Tadej Tašner, Darko Lovrec, 2012, original scientific article

Abstract: Research departments and laboratories, as well as industry itself need to become more flexible. They need to adopt new trends and technologies as quickly as possible. It is obvious however, that any hardware should be changed minimally in order to reduce costs and the complexities of any changes necessary. Therefore, any update has to be made mainly by software changes. This article introduces a concept of a transmission test ]stand modified into a hydraulic test ]stand, using the same equipment and changed software based on LabVIEW. LabVIEW uses G programming language with block diagrams which is, compared to a text-based program, easier to understand and update.
Keywords: LabVIEW, test-stand, transmission, hydraulics, graphic programming
Published: 01.06.2012; Views: 688; Downloads: 26
URL Link to full text

7.
Sand as a medium for transmission of vibratory signals of prey in antlions Euroleon nostras (Neuroptera: Myrmeleontidae)
Dušan Devetak, Bojana Mencinger Vračko, Miha Devetak, Marko Marhl, Andreja Špernjak, 2007, original scientific article

Abstract: European pit-building antlions (Euroleon nostras/ Geoffroy in Fourcroy/) detect their prey by sensing the vibrations that prey generate during locomotory activity. The behavioural reactions and some of the physical properties of substrate vibrations in sand are measured to observe signal transmission through the substrate. The frequency range of the signals of four arthropod species (Tenebrio molitor, Pyrrhocoris apterus, Formica sp. and Trachelipus rathkei) is 0.1-4.5 kHz and acceleration values are in the range ▫$400 {mu}m s^{-2} to 1.5 mm s^{-2}$▫. Substrate particle size and the frequency of prey signals both influence the propagation properties of vibratory signals. The damping coefficient at a frequency 300 Hz varies from 0.26 to 2.61 dB ▫$cm^{-1}$▫ and is inversely proportional to the size of the sand particle. The damping coefficient is positively correlated with the frequency of the pulses. Vibrations in finer sand are attenuated more strongly than in coarser sand and, consequently, an antlion detects its prey only at a short distance. The reaction distance is defined as the distance of the prey from the centre of the pit when the antlion begins tossing sand as a reaction to the presence of prey. The mean reaction distance is 3.3 cm in the finest sand (particle size ▫$le 0.23 mm$▫) and 12.3 cm in coarser sand (particle size 1-1.54 mm). The most convenient sands for prey detection are considered to be medium particle-sized sands.
Keywords: biology, zoology, receptors, chordotonal organs, vibrations, vibratory signals, transmission of vibrations, reception of vibrations, electrophysiology, substrate vibration, antlions, Myrmeleontidae, sand, substrate vibration, particle size
Published: 07.06.2012; Views: 1317; Downloads: 63
URL Link to full text

8.
9.
ETHICAL ISSUESA AND AESTHETIC CONTEXT IN CORMAC MCCARTHY`S: THE ROAD
Vid Hudrap, Božidar Kante, 2016, undergraduate thesis

Abstract: The graduation thesis titled ETHICAL ISSUES AND AESTHETIC CONTEXT IN CORMAC MCCARTHY'S: THE ROAD discusses the novel The Road written by Cormac McCarthy from an ethical and aesthetical perspective. It covers issues of morality, its origins and how it is transmitted to the next generation in a world where society and its accomplishments were wiped out by a catastrophe of epic proportions. Here it examines the transmission of values from the father to the son who only knows society after the catastrophe – a society consisting only of father and son and the hostile environment they are subjected to. It follows the journey of a father and son who wander the desolate landscape in search of food and shelter and it deals with the ethical issues they encounter in their path ridden with cannibalistic bands, lone thieves and other individuals. The thesis examines the choices of the protagonists in dealing with other people, ethical conflicts which arise in these situations and between the protagonists themselves, as well as their quest to maintain their humanity. In doing so, it examines the metaphor of fire, the way people make moral decisions, our perception of moral goals and lines – the limits we set ourselves in how we deal with other people. It also touches on the basic concept of cooperation, how it evolved and its benefits for creating and maintaining a complex human society.
Keywords: Ethics, aesthetics, morality, transmission of morality, society, bright lines, bright lights, conceptual metaphor, cooperation.
Published: 02.06.2016; Views: 641; Downloads: 50
.pdf Full text (789,18 KB)

10.
ERROR PROBABILITY MODEL FOR IEEE 802.15.4 WIRELESS TRANSMISSION WITH CO-CHANNEL INTERFERENCE AND BACKGROUND NOISE
Uroš Pešović, 2016, doctoral dissertation

Abstract: 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.
Keywords: 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
Published: 14.10.2016; Views: 1022; Downloads: 59
.pdf Full text (8,20 MB)

Search done in 0.2 sec.
Back to top
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica