Search the digital library catalog

Abstract: Diplomska naloga opisuje osnovne in pogoste primere uporabe programirljivih logičnih krmilnikov, ki jih srečamo v industriji ter običajno uporabljene elemente, ki jih vežemo nanj kot so senzorji in aktuatorji. Razložena je splošna zgradba različnih logičnih krmilnikov ter njihov priklop in povezava na osebni računalnik. S preprostimi aplikacijami in z orodjem za programiranje kot je TIA Portal, je razloženo delovanje digitalnih vhodov, digitalnih izhodov, analognih vhodov in analognih izhodov. Za vsakega od posameznih so navedeni najbolj tipični elementi za priključitev, ter njihove vezalne sheme. Objasnjena je tudi komunikacija človek – stroj s praktičnim primerom.
Keywords: krmilnik, programiranje, senzorji, aktuatorji, komunikacija
Published in DKUM: 08.05.2025; Views: 0; Downloads: 10
Full text (10,12 MB)

Abstract: V okviru diplomske naloge smo predelali preprostejši stroj za rebričenje z relejske tehnike krmiljenja na PLK krmiljenje. Za predelavo smo se odločili zaradi nenatančne nastavitve časov in predloga zaposlenih, saj bo s predelavo upravljanje s strojem lažje in zanesljivejše. Pri predelavi smo uporabili krmilnik Siemens LOGO!. PLK krmiljenje je preprostejše, program pa nam omogoča, da ga kadarkoli spreminjamo. Ko smo izdelali krmilno omaro in programirali v programskem okolju Siemens LOGO! Soft Comfort, je sledila umestitev komponent v stroj. Na koncu smo testirali pravilno delovanje stroja. S predelavo stroja smo seznanili zaposlene in zapisali navodila za upravljanje s strojem.
Keywords: stroj za rebričenje, programirljivo logično krmiljenje (PLK), industrijska avtomatizacija, nadgradnja stroja
Published in DKUM: 08.05.2025; Views: 0; Downloads: 1
Full text (6,99 MB)

Abstract: Background: The software product lines (SPL) enable development teams to fully address a systematic reuse of shared assets to deliver a family of similar software products. Mobile applications are an obvious candidate for employing an SPL approach. This paper presents our research outcomes, based on empirical data from an industry-level development project. Two development teams were confronted with the same functionalities set to be delivered through a family of native mobile applications for Android and iOS. Methods: Empirical data was gathered before, during and after a year of full-time development. The data demonstrate the impact of a SPL approach by comparing the SPL and non-SPL multiple edition development. One family of products (Android apps) was developed using an SPL approach, while another (iOS apps), functionally the same, was developed without employing an SPL approach. The project generated a volume of raw and aggregated empirical data to support our research questions. Results: The paper reports a positive impact of an SPL approach on product quality (internal and external) and feature output per week. As data shows, it also increases the delivery of functionalities (240% in 6 more editions), while investing the same amount of effort needed for a single-edition development. As a result of system-supported separation of development and production code, developers had a high confidence in further development. On the other hand, the second team delivered less new functionalities, only two new application editions, and lower software quality than the team that manages multi-edition development by employing an SPL approach.
Keywords: software product line, Android, simultaneous development, iOS, Software quality, software product editions
Published in DKUM: 17.04.2025; Views: 0; Downloads: 0
Full text (2,46 MB)
This document has many files! More...

Abstract: The rising incidence of skin cancer, particularly melanoma, underscores the need for improved diagnostic tools in dermatology. Accurate imaging plays a crucial role in early detection, yet challenges related to color accuracy, image distortion, and resolution persist, leading to diagnostic errors. This study addresses these issues by evaluating color reproduction accuracy across various imaging devices and lighting conditions. Using a ColorChecker test chart, color deviations were measured through Euclidean distances (∆E*, ∆C*), and nonlinear color differences (∆E00, ∆C00), while the color rendering index (CRI) and television lighting consistency index (TLCI) were used to evaluate the influence of light sources on image accuracy. Significant color discrepancies were identified among mobile phones, DSLRs, and mirrorless cameras, with inadequate dermatoscope lighting systems contributing to further inaccuracies. We demonstrate practical applications, including manual camera adjustments, grayscale reference cards, post-processing techniques, and optimized lighting conditions, to improve color accuracy. This study provides applicable solutions for enhancing color accuracy in dermatological imaging, emphasizing the need for standardized calibration techniques and imaging protocols to improve diagnostic reliability, support AI-assisted skin cancer detection, and contribute to high-quality image databases for clinical and automated analysis.
Keywords: dermoscopy, melanoma, color analysis, color error, spectral power distribution, grey card, digital imaging standards
Published in DKUM: 08.04.2025; Views: 0; Downloads: 3
Full text (5,63 MB)

Abstract: Evolutionary algorithms have been shown to be very effective in solving complex optimization problems. This has driven the research community in the development of novel, even more efficient evolutionary algorithms. The newly proposed algorithms need to be evaluated and compared with existing state-of-the-art algorithms, usually by employing benchmarks. However, comparing evolutionary algorithms is a complicated task, which involves many factors that must be considered to ensure a fair and unbiased comparison. In this paper, we focus on the impact of stopping criteria in the comparison process. Their job is to stop the algorithms in such a way that each algorithm has a fair opportunity to solve the problem. Although they are not given much attention, they play a vital role in the comparison process. In the paper, we compared different stopping criteria with different settings, to show their impact on the comparison results. The results show that stopping criteria play a vital role in the comparison, as they can produce statistically significant differences in the rankings of evolutionary algorithms. The experiments have shown that in one case an algorithm consumed 50 times more evaluations in a single generation, giving it a considerable advantage when max gen was used as the stopping criterion, which puts the validity of most published work in question.
Keywords: evolutionary algorithms, stopping criteria, benchmarking, algorithm termination, algorithm comparison
Published in DKUM: 28.03.2025; Views: 0; Downloads: 2
Full text (1,40 MB)
This document has many files! More...