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Pregled pristopov in metod določanja časovnih normativov
Luka Zupanič, 2020, diplomsko delo

Opis: Tematika diplomskega dela vsebuje pregled metod določanja časovnih normativov in sicer sistema REFA ter WORK-FACTOR hitri postopek. REFA je združenje za organizacijo dela in razvija metode za operativno zbiranje in upravljanje podatkov. WORK-FACTOR hitri postopek pa je sistem, namenjen za ovrednotenje ročnega dela. Pobližje so predstavljena tudi orodja ponudnikov DELMIA in DRIGUS. DELMIA ima na voljo raznovrstna programska orodja kot so programsko orodje za postavitev digitalne proizvodnje, programsko orodje, katero se ukvarja z upravljanjem proizvodnih operacij, programsko orodje za upravljanje oskrbovalnih verig, programsko orodje za področje robotike, itd. Ponudnik DRIGUS pa ponuja produkt MULTIDATA, ki je namenjen za časovne študije in za dejavnosti vzorčenja časa. Zraven tega pa je na voljo še več programskih orodij kot so MEZA, PLAZET, MULTI, TAKTOS, FORMAS in REGRESSA. Od vseh naštetih sta podrobneje predstavljeni MEZA in PLAZET. MEZA je orodje, s katerim se določajo časovne študije, med tem ko PLAZET služi za določanje planskih časov. Predstavljena je tudi norma, kaj vse je treba upoštevati pri določanju in izračunu ter zakaj jo je smiselno določiti. Analizirani so sestavni elementi norme in pomen določitve časa naročila.
Ključne besede: Norma, REFA, WORK-FACTOR, DRIGUS, DELMIA.
Objavljeno: 18.01.2021; Ogledov: 118; Prenosov: 13
.pdf Celotno besedilo (2,92 MB)

Comparison of different stator topologies for BLDC drives
Mitja Garmut, 2020, magistrsko delo

Opis: The focus of this Master's thesis was to increase the output-power density of a fractional-horsepower BLDC drive. Different stator segmentation topologies were analyzed and evaluated for this purpose. The presented analysis was performed by using various models with different complexity levels, where a Magnetic Equivalent Circuit (MEC) model and a 2D transient Finite Element Method (FEM) model combined with a power-loss model, were applied systematically. Characteristic behavior of the BLDC drive was obtained in this way. The models were validated with measurement results obtained on an experimental test drive system. The influence of the weakening of the magnetic flux density and flux linkage, due to segmentation were analyzed based on the validated models. Furthermore, the increase of the thermal-stable output power and efficiency was rated, due to the consequently higher slot fill factor. Lastly, a detailed iron-loss analysis was performed for different stator topologies. The performed analysis showed that segmentation of the stator can enable a significant increase of the output power of the discussed BLDC drives, where the positive effects of segmentation outweigh the negative ones from the electromagnetic point of view. Segmentation, however, also impacts other domains, such as Mechanical and Thermal, which was out of the scope of this thesis, and will be performed in the future.
Ključne besede: fractional-horsepower BLDC drive, stator segmentation, fill factor increase, thermal-stable output power, Finite Element Method model
Objavljeno: 17.11.2020; Ogledov: 156; Prenosov: 0
.pdf Celotno besedilo (1,69 MB)

Statistical analysis of the development indicators' impacts on e-commerce of individuals in selected European countries
Ksenija Dumičić, Ivana Skoko Bonić, Berislav Žmuk, 2018, izvirni znanstveni članek

Opis: The aim of this paper is to analyse the influence of the development level indicators on the e-commerce, i.e. on the online purchase by individuals, in selected European countries in 2013. In the analysis, the main variable under study and all the independent variables are included as standardised. Based on nine variables, the principal component analysis with varimax rotation was performed and the two extracted factors were used as the regressors in the multiple regression analysis. In the regression model both components, Factor 1, which includes seven variables, called Prosperity, Investing in Education and IT Infrastructure, and Awareness, and Factor 2, comprised of two variables, called IT Skills, are statistically significant at the significance level of 1%. Both factors show a positive correlation with the online purchase of individuals. Inclusion and analysis of distributions and impacts of even nine independent variables, which make up two distinct factors affecting the e-commerce, make a new contribution of this work.
Ključne besede: e-commerce, broadband access to the Internet, factor analysis, multiple regression analysis
Objavljeno: 10.10.2018; Ogledov: 563; Prenosov: 279
.pdf Celotno besedilo (343,31 KB)
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Correlation between the point load index, $I_{s(50)}$, and the resistance to unconfined compression in limestone from the comunidad Valenciana, Spain
Manolo Galván, Jorge Preciado, Jose Serón, 2014, izvirni znanstveni članek

Opis: The unconfined compression strength is one of the most important engineering parameters in rock mechanics; it is used to characterize and study the behaviour of solid rocks. A good correlation between the unconfined compression strength test (UCS) and the point load strength (PLS) can be very useful, because it allows for faster and cheaper testing than other methods with the same security to calculate the structures and performances of solid rocks. A preliminary step to implement the correlation is to have a good method to determine the resistance to a point load. This determination is correct if we have a sufficient number of tests on specimens of the same nature, but usually this does not occur, and it is necessary to apply a size-correction factor, F = (De/50)α, with α = 0.45. This paper is based on limestone from Comunidad Valenciana, Spain, because it represents a very high percentage of the rocks. The implementation was conducted over 700 field and laboratory tests, of which 255 are PLT tests, 45 are UCS tests, and the rest are other parameters, like porosity and specific weight, Slake Durability, and ultrasonic velocity.
Ključne besede: resistance to point load, point load strength, Franklin test, size correction factor, unconfined compression
Objavljeno: 14.06.2018; Ogledov: 419; Prenosov: 37
.pdf Celotno besedilo (398,58 KB)
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The stability of the excavation face of shallow civil and mining tunnels
Pierpaolo Oreste, 2011, izvirni znanstveni članek

Opis: The stability of the excavation face of shallow tunnels excavated in difficult ground conditions is currently a relevant problem in the sector for tunnelling and mining. Even though face-reinforcement interventions with fibreglass dowels have proved to be efficient, there is still no reliable analysis and dimensioning method available. A new calculation procedure is illustrated in this paper for the analysis of the face static condition in shallow tunnels, also when reinforcement interventions with fibreglass dowels are used. The procedure is based on the limit-equilibrium method applied to the ground core ahead of the face. The main result of the calculation is that the safety factor of the excavation face is also obtained in the presence of reinforcements and from this it is then possible to proceed with the dimensioning of the intervention. The procedure has been applied to two real cases and satisfactory results have been obtained.
Ključne besede: fibreglass dowels, face reinforcement, surface tunnel, limit equilibrium method, factor of safety
Objavljeno: 13.06.2018; Ogledov: 365; Prenosov: 69
.pdf Celotno besedilo (213,90 KB)
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Container throughput forecasting using dynamic factor analysis and ARIMAX model
Marko Intihar, Tomaž Kramberger, Dejan Dragan, 2017, izvirni znanstveni članek

Opis: The paper examines the impact of integration of macroeconomic indicators on the accuracy of container throughput time series forecasting model. For this purpose, a Dynamic factor analysis and AutoRegressive Integrated Moving-Average model with eXogenous inputs (ARIMAX) are used. Both methodologies are integrated into a novel four-stage heuristic procedure. Firstly, dynamic factors are extracted from external macroeconomic indicators influencing the observed throughput. Secondly, the family of ARIMAX models of different orders is generated based on the derived factors. In the third stage, the diagnostic and goodness-of-fit testing is applied, which includes statistical criteria such as fit performance, information criteria, and parsimony. Finally, the best model is heuristically selected and tested on the real data of the Port of Koper. The results show that by applying macroeconomic indicators into the forecasting model, more accurate future throughput forecasts can be achieved. The model is also used to produce future forecasts for the next four years indicating a more oscillatory behaviour in (2018-2020). Hence, care must be taken concerning any bigger investment decisions initiated from the management side. It is believed that the proposed model might be a useful reinforcement of the existing forecasting module in the observed port.
Ključne besede: container throughput forecasting, ARIMAX model, dynamic factor analysis, exogenous macroeconomic indicators, time series analysis
Objavljeno: 12.12.2017; Ogledov: 855; Prenosov: 277
.pdf Celotno besedilo (1,33 MB)
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Trend analysis of journal metrics: a new academic library service?
Peter Kokol, 2017, izvirni znanstveni članek

Opis: Objective: Temporal trends in source normalized impact per paper (SNIP) values for the three top-ranking nursing journals were analyzed and compared to explore whether predicting future SNIP values based on trend analysis could be an innovative service provided by librarians. Methods: The International Journal of Nursing Studies, Journal of Nursing Scholarship, and Journal of Advanced Nursing were the three top-ranked nursing journals according to 2015 SNIP values. SNIP values for the selected journals were retrieved from the Scopus database, and extracted data were exported to Joinpoint trend analysis software to perform trend analysis. Results: The trend in SNIP values for the International Journal of Nursing Studies was the most stable and positive, whereas the trend in SNIP values for the Journal of Advanced Nursing was the most negative. The annual percentage change of the most recent trend line, which is the best indicator for predicting future SNIP values, was the largest for the International Journal of Nursing Studies. Conclusions: Predictions of journal metrics based on statistical joinpoint regression may not be completely accurate. Using this technique, however, a librarian can reasonably claim which journal will retain or even improve its prestige in the future and thus safely advise prospective authors on where to publish their research.
Ključne besede: publish or perish, medical library, trend analysis, journal impact factor, joinpoint regression
Objavljeno: 09.10.2017; Ogledov: 798; Prenosov: 258
.pdf Celotno besedilo (227,10 KB)
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The impact of the implementation of a learning organization on the formation of a positive organizational identity
Marko Peršič, Duško Uršič, Draško Veselinovič, 2014, izvirni znanstveni članek

Opis: This paper examines the results of a broader research of the impact of the implementation of a learning organization on the formation of a positive organizational identity in the Slovenian entrepreneurial practice. On the basis of an analysis carried out in 2012 on a sample of 132 enterprises in Slovenia, the authors derived their own definition of organizational learning. With the aid of factor analysis and a regression model, we established that each factor defined in this paper independently affects the formation of a positive organizational identity. However, in the event of joint factors of the learning organization, only the factor empowerment and organization have a statistically significant impact on the formation of a positive organizational identity. The findings from our research are applicable in almost every company in Slovenia, where the management can use them to form the company’s organizational identity with the aim of increasing the competitiveness of the company’s business.
Ključne besede: learning organization, positive organizational identity, organizational learning, factor analysis
Objavljeno: 03.08.2017; Ogledov: 708; Prenosov: 65
.pdf Celotno besedilo (101,24 KB)
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Motor structure and basic movement competences in early child development
Rado Pišot, Jurij Planinšec, 2010, izvirni znanstveni članek

Opis: Motor development consists of dynamic and continuous development in motor behaviour and is reflected in motor competences (on the locomotive, manipulative and postural level) and motor abilities (coordination, strength, speed, balance, flexibility, precision and endurance). This is a complex process in which a child acquires motor abilities and knowledge in interaction with inherited and environmental factors. A sample of 603 boys and girls, of which 263 were aged five (age deviation +/– 3 days; 18,5 ± 3,1kg body weight; 109,4 ± 4,3 cm body height) and 340 were aged six and a half (age deviation +/– 3 days; 23, 7 ± 4, 3 kg body weight; 121 ± 4,8 cm body height), were involved in this study after written consent was obtained from their parents. The children’s motor structure was established through the application of 28 tests that had been verified on the Slovene population and established as adequate for the study of motor abilities in the sample children. The factor analysis was applied to uncover the latent structure of motor space, and PB (Štalec & Momirović) criteria were used to establish the number of significant basic components. The analysis of the motor space structure revealed certain particularities for each age period. In the sample of 5 year old children, the use of PB criterion revealed four latent motor dimensions, in 6.5 year old children, the latent motor space structure was described with four (boys) and five (girls) factors. Despite the existence of gender differences in motor space structure and certain particularities in each age period mostly related to the factors which influence movement coordination, several very similar dimensions were discovered in both sexes.
Ključne besede: early childhood, motor development, motor skills and knowledge, motor structure, factor analysis
Objavljeno: 21.07.2017; Ogledov: 19383; Prenosov: 121
.pdf Celotno besedilo (249,13 KB)
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The multiple critera assessment of social responsibility in organizations
Vesna Čančer, Simona Šarotar Žižek, objavljeni znanstveni prispevek na konferenci

Opis: The assessment of social responsibility (SR) in organizations requires a hierarchy of requisitely holistic factors and indicators. This paper introduces the development of measuring instrument for this multidimensional problem. Differently from using factor analysis based on principal component analysis extraction method, it presents the use of exploratory factor analysis (EFA) to develop the multiple criteria model for the assessment of SR. It also discusses several approaches for the weights determination: because considering factor loadings of the indicators obtained via EFA does not tend to differentiate between the levels of importance, the SMARTER method based on ordinal scale was used in criteria weighting. It proposes the solutions for measuring local alternatives’ values with respect to indicators by using value functions. Application possibilities of the results of the multiple criteria assessment of SR are illustrated and discussed via a real-life case of organizations in Slovenia.
Ključne besede: exploratory factor analysis, multiple criteria model, social responsibility, weighting
Objavljeno: 21.07.2017; Ogledov: 487; Prenosov: 91
.pdf Celotno besedilo (689,92 KB)
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