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1.
The technical efficiency of Tunisian ports : comparing data envelopment analysis and stochastic frontier analysis scores
Rabeb Kammoun, 2018, izvirni znanstveni članek

Opis: Maritime transportation for Tunisia plays an important role in trade exchange with other countries. Therefore, the objective of this paper is to measure the efficiency scores of 7 seaports in Tunisia by applying the Stochastic Frontier Analysis (SFA) with Cobb-Douglas production function and Data envelopment analysis (DEA) with CCR and BCC models. The annual data collected cover the 2007-2017 period for each port. Thus, the sample size for the analysis comprises a total of 77 observations. The empirical result shows that the total average scores of operating efficiency scores were DEA-BCC (0.746)>SFACD (0.536)>DEA-CCR (0.334) from 2007 to 2017. Given these results, the port of Gabes can be considered as the best efficient port in the 3 models (DEA-BCC, DEACCR and SFA-CD).
Ključne besede: efficiency, data envelopment analysis (DEA), stochastic frontier analysis (SFA), Tunisian seaports
Objavljeno v DKUM: 22.08.2024; Ogledov: 44; Prenosov: 4
.pdf Celotno besedilo (554,85 KB)
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2.
Applying integrated data envelopment analysis and analytic hierarchy process to measuring the efficiency of tourist farms : The Case of Slovenia
Boris Prevolšek, Maja Borlinič Gačnik, Črtomir Rozman, 2023, izvirni znanstveni članek

Opis: This paper examines the efficiency of tourist farms in Slovenia by adopting an approach using a framework of non-parametric programming—Data Envelopment Analysis (DEA) and Analytic Hierarchy Process (AHP), combining the two because the DEA analysis by itself does not take into account all attributes, especially qualitative ones. The beforementioned two methods rank the farm tourism units with respect to their efficiency. By using the DEA method, an input- and output-oriented BCC and CCR model were introduced to upgrade the criteria by including the additional non-numerical criteria of the AHP. The results of the models showed that there are possible improvements on all levels of efficiency, as well as on the criteria of the additional offer of tourist farms, which were analyzed in the AHP model with additional criteria. According to the estimated efficiency, the ranking of tourist farms differed according to the two methods. Within the group of farms assessed as efficient by DEA, the AHP model allowed a more accurate ranking.
Ključne besede: farm tourism, tourist farms, efficiency, data envelopment analysis (DEA), analytic hierarchy process (AHP), Slovenia
Objavljeno v DKUM: 09.04.2024; Ogledov: 281; Prenosov: 19
.pdf Celotno besedilo (1,06 MB)
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3.
Application of gas condensing boilers in domestic heating
Marija Živić, Antun Galović, Jurij Avsec, Antun Barac, 2019, izvirni znanstveni članek

Opis: A growing number of households have had condensing boilers built in to be used for the heating of spaces and for the hot water supply. The use of condensing boilers is justified from the point of view of energy because they achieve higher thermal efficiency than traditional boilers. Condensation of water vapour occurs in the flue gases, whereby the heat released by condensation is used to heat the water in the boiler. How much water vapour will condense depends on the temperature to which the flue gases are cooled. In this paper, a thermodynamic analysis of thirteen built-in gas condensing boilers was performed; data on the flue gas composition and temperature, as well as on the excess air required for combustion were obtained for that purpose. The calculation results consisting of the amount of condensed water, the thermal efficiency of the boiler, and the volume flow rates of the air and fuel are presented in tables. The analysis identified the cases in which the water vapour condensation occurred and determined the amount of the condensed water. The cases without water vapour condensation were also identified.
Ključne besede: gas condensing boilers, thermodynamic analysis, thermal efficiency of the boiler
Objavljeno v DKUM: 22.02.2024; Ogledov: 281; Prenosov: 20
.pdf Celotno besedilo (842,88 KB)
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4.
Food Waste to Energy through Innovative Coupling of CHP and Heat Pump
Jan Drofenik, Danijela Urbancl, Darko Goričanec, Zdravko Kravanja, Zorka Novak-Pintarič, 2023, izvirni znanstveni članek

Opis: This paper presents the conceptual design of a technological solution for the efficient conversion of food waste into heat and power. The distribution and composition of food loss and waste at different stages of the food supply chain in Slovenia and their potential for biogas production were determined. It was found that more than 50% of food waste comes from households. Therefore, a small plant was designed to convert food waste into biogas, which was innovatively coupled with a combined heat and power (CHP) unit and a heat pump. This doubles the amount of heat generated compared to conventional cogeneration. Based on the capacity of a micro commercial CHP unit, 3330 households (about 8000 residents) would supply food waste. The heat generated could replace 5% of the natural gas used for domestic water heating. The payback period would be 7.2 years at a heat price of about 80 EUR/MWh, however, for municipalities with more than 40,000 inhabitants the payback period would be reduced to less than 3 years. The cost price of the heat generated by this system would be about 25 EUR/MWh, taking into account the government subsidy for the operation of the CHP unit.
Ključne besede: food waste to energy, biogas, combined heat and power, CHP, heat pump, efficiency, conceptual design, preliminary economic assessment, sensitivity analysis
Objavljeno v DKUM: 16.02.2024; Ogledov: 3257; Prenosov: 28
.pdf Celotno besedilo (19,44 MB)
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5.
Efficiency analysis with non parametric method: illustration of the Tunisian ports
Arbia Hlali, 2018, izvirni znanstveni članek

Opis: This paper applies a non-parametric method to provide level technical efficiency for 7 Tunisian ports during 18 years (1998-2015). These ports represent different data set. The use of the model of variable returns to scale (VRS) has led to interesting results. The results show that the most ports are characterized by low levels of technical efficiency, with the exception port of Rades. In addition, the result shows the variation of variable returns to scale and constant returns to scale of technical port’s efficiency. Furthermore, we concluded that the panel data improves the efficiency estimates.
Ključne besede: technical efficiency, Tunisian ports, non parametric analysis
Objavljeno v DKUM: 25.04.2018; Ogledov: 1444; Prenosov: 442
.pdf Celotno besedilo (382,56 KB)
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6.
The analysis of barriers in succession processes of family business with the use of grey incidence analysis (Polish Perspective)
Ewa Więcek-Janka, Rafał Mierzwiak, Joanna Kijewska, 2016, izvirni znanstveni članek

Opis: The article presents results of research on the identification and evaluation of barriers faced by successors in family businesses during the first process of succession. The analysis of empirical material used grey systems theory, which was considered as an equivalent for the analysis of small samples and qualitative research. While conducting the literature review and empirical study, the authors concentrated on (a) the identification of barriers in the development of family firms and (b) eliciting the perspective of the new generation of owners in family firms entering the succession process through an empirical analysis of the assessed level of risk in relationships with family and business.
Ključne besede: family business, company performance, business efficiency, leadership, ownership, family, risk, research, grey incidence analysis, grey system theory
Objavljeno v DKUM: 14.11.2017; Ogledov: 1483; Prenosov: 417
.pdf Celotno besedilo (695,38 KB)
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7.
Measuring efficiency of nations in multi sport events : a case of Commonwealth Games XIX
Roma Mitra Debnath, Ashish Malhotra, 2015, izvirni znanstveni članek

Opis: This paper used a data envelopment analysis (DEA) to measure the performance of the nations participating in the Commonwealth Games. To increase the consistency of the research, multiple models were employed to validate the result, but the nature of the input and output remained same throughout the paper. The objective of this study was to establish some realistic targets in terms of number of players for all participant countries and evaluations of their performance as well as benchmarks against the most efficient country. This study would help the nations optimize the size of their players to maximize the outcome in terms of the number of medals won in sporting events.
Ključne besede: performance measurement, data envelopment analysis, efficiency, Commonwealth Games
Objavljeno v DKUM: 13.11.2017; Ogledov: 1485; Prenosov: 163
.pdf Celotno besedilo (1,51 MB)
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8.
Financial aspects of a seismic base isolation system for a steel high-rack structure
Vojko Kilar, Simon Petrovčič, Simon Šilih, David Koren, 2013, izvirni znanstveni članek

Opis: The paper deals with the effects and costs of implementing a base isolation system for the mitigation of the seismic risk of an existing steel rack structure. Different realistic distributions of the payload mass and occupancy levels, which form different plan asymmetric variants, have been analysed. The results obtained by the pushover analysis (N2 method) are presented as top floor envelopes and as plastic hinge damage patterns. In the presented cost study, the cost of the implementation of the proposed base isolation system is compared with the estimated costs of structural repairs to the damaged structural members of the superstructure, as well as with estimated expenses of the downtime period. The results have shown that base isolation is, in general, not economically feasible for lower ground motion intensities, whereas it could be of great benefit in the case of moderate and high intensities, especially if the downtime period is taken into account.
Ključne besede: rack structures, seismic behaviour, base isolation, cost efficiency, mass eccentricity, pushover analysis
Objavljeno v DKUM: 07.08.2017; Ogledov: 1316; Prenosov: 161
.pdf Celotno besedilo (999,00 KB)
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