1. A case study on entropy-aware block-based linear transforms for lossless image compressionBorut Žalik, David Podgorelec, Ivana Kolingerová, Damjan Strnad, Štefan Kohek, 2024, izvirni znanstveni članek Opis: Data compression algorithms tend to reduce information entropy, which is crucial, especially in the case of images, as they are data intensive. In this regard, lossless image data compression is especially challenging. Many popular lossless compression methods incorporate predictions and various types of pixel transformations, in order to reduce the information entropy of an image. In this paper, a block optimisation programming framework is introduced to support various experiments on raster images, divided into blocks of pixels. Eleven methods were implemented within , including prediction methods, string transformation methods, and inverse distance weighting, as a representative of interpolation methods. Thirty-two different greyscale raster images with varying resolutions and contents were used in the experiments. It was shown that reduces information entropy better than the popular JPEG LS and CALIC predictors. The additional information associated with each block in is then evaluated. It was confirmed that, despite this additional cost, the estimated size in bytes is smaller in comparison to the sizes achieved by the JPEG LS and CALIC predictors.
Ključne besede: computer science, information entropy, prediction, inverse distance transform, string transformations
Objavljeno v DKUM: 07.01.2025; Ogledov: 0; Prenosov: 9
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2. The changeable political map of the upper Adriatic region : from conflict to harmony?Milan Bufon, 2008, izvirni znanstveni članek Opis: The paper will present a geopolitical and political geographical overview of the Upper Adriatic region as an area of contact between different cultural, social, economic and political entities, producing potential of conflicts, particularly in the period of growing nationalism and emerging nation-state formulation in this region.
Ključne besede: Upper Adriatic, political geographical transformations, cross-border cooperation, social and spatial convergence and divergence
Objavljeno v DKUM: 13.03.2018; Ogledov: 1257; Prenosov: 111
Celotno besedilo (157,86 KB)
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3. Information technology and organizational effectiveness : re-evaluation of the radical transformations 1980-2010Markku Sääksjärvi, 2010, izvirni znanstveni članek Opis: The idea of this paper is to review and summarize the complex interplay between information technology (IT) and organization in stages that impacted radically both the organizational structure and the evolution of effectiveness and economic performance. We could identify five major stages where the underlying technology, the typical organizational structure, and the criteria of performance or business success changed, increasing the complexity of evaluation models proposed. It seemed that the effectiveness impacts of IT escalated from the individual to the team level, from the organizational to the virtual ecosystem level, and from the corporate to the national or global level. Therefore, the IT productivity paradox could not be refuted until 2003.
Ključne besede: organizational effectiveness, information technology, transformations, productivity paradox
Objavljeno v DKUM: 30.11.2017; Ogledov: 1126; Prenosov: 160
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4. The characterization of phase transformations in rapidly solidified Al-Fe and Cu-Fe alloys through measurements of the electrical resistance and DSCMilan Bizjak, Ladislav Kosec, Borut Kosec, Ivan Anžel, 2006, izvirni znanstveni članek Opis: For the characterization of the phase transformations in the alloys during the heat treatment the various methods of the thermal analyses are available. Thermogravimetry, differential thermal analysis (DTA) and the differential scanning calorimetry (DSC) are the most frequently used methods. The phase transformations proceed in two stages, i.e. nucleation and the growth of the new phase. Both processes are closely linked with the movement of the atoms. Rapidly solidified alloys often contain the elements with the low diffusivity. During the transition from the unstable to the stable state the energy changes are small, therefore the characterization of the changes by DTA, DSC is very difficult and could not be measured. During the heat treatment the phase transformations of the rapidly solidified alloys of Al-Fe and Cu-Fe were successfully detected by the simultaneous measurements of the electrical resistance, and were compared by the DSC method. By determination of the temperature regions of the phase transitions or temperatures, where the dynamics of the changes is maximal, the samples were heat treated and analysed by the scanning and transmission electron microscopy respectively.
Ključne besede: rapidly solidified Al-Fe alloy, rapidly solidified Cu-Fe alloy, transformations, electrical resistance, differential scanning calorimetry
Objavljeno v DKUM: 03.07.2017; Ogledov: 1966; Prenosov: 150
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