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    Wyświetlanie 1-8 z 8
    Tytuł:
    Assessing telecommunication contractor firms using a hybrid DEA-BWM method
    Autorzy:
    Valizadeh, Omid
    Ghiyasi, Mojtaba
    Powiązania:
    https://bibliotekanauki.pl/articles/29432383.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    performance assessment
    data envelopment analysis
    best worst method
    telecommunication contractor firm
    Opis:
    Telecommunication companies have an important role in technology development, so evaluating the performance of these companies has been an interest of managers. This article uses a hybrid method using data envelopment analysis (DEA) and the best-worst method (BWM) to measure the performance of communication companies. The hybrid DEA-BWM method is used for the weight determination and performance assessment of 17 telecommunication contractor firms in the Khorsan Razavi province of Iran. We considered four inputs: gross losses, sales cost, legal reserve, and fixed assets. On the other side, three outputs including operation income, operation profit, and retained earnings are considered as outputs. Considering the input-output parameters and using the hybrid method by seven selected criteria, we rank all contractor firms. We found that the BPM firm has the best performance while and GKS firm is found as the firm with the weakest performance. Compared with the classical DEA methods, we found more reliable results with higher discrimination power, using the hybrid DEA-BWM.
    Źródło:
    Operations Research and Decisions; 2023, 33, 4; 189--200
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    General bankruptcy prediction models for the Visegrád Group : the stability over time
    Autorzy:
    Tomczak, Sebastian Klaudiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/29432382.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    SMEs
    discriminant analysis
    logit analysis
    construction sector
    stability of model
    Opis:
    Managers of enterprises must constantly face the continual changes on the market and fight for survival in a world of high competition. Therefore, it is important to systematically monitor the company’s financial condition. This will help to identify problems and give specific time to take corrective action. Bankruptcy prediction models are usually constructed for local goals. The purpose of the article is to build not only regional but also general discriminant and logit models for the SMEs operating in the construction industry in Visegrád Group countries. A total of 32 unique models were built and verified along with the Altman model for emerging markets. The paper also contributes to the literature by assessing the stability of the constructed models over time, which the models’ authors do not usually measure. The results showed that regional models are characterized by higher accuracy than general ones. However, general models can be adapted to the analyzed Visegrád Group with an accuracy of approximately 90%. The G1 LR model can be considered the best model, as it has relatively high accuracy and over-time stability.
    Źródło:
    Operations Research and Decisions; 2023, 33, 4; 171--187
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On portfolio analysis using oriented fuzzy numbers for the trade-related sector of the Warsaw Stock Exchange
    Autorzy:
    Łyczkowska-Hanćkowiak, Anna
    Wójcicka-Wójtowicz, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/29432380.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    oriented fuzzy numbers
    recommendation
    portfolio analysis
    imprecision
    fuzzy discount factor
    Opis:
    Oriented fuzzy numbers are useful in portfolio management since they convey information regarding uncertainty and imprecision when considering financial markets. One may apply a fuzzy discount factor and an imprecise present value in the form of a trapezoidal oriented fuzzy number. An investor can obtain recommendations on individual stocks (buy, sell, accumulate, reduce). Analogous recommendations are also issued by experts. In such cases, recommendations are mostly based on available data and expert’s knowledge and experience. The purpose of the paper is to present a procedure for comparing the accuracy of both types of recommendations. Also, the real impact the recommendations have on potential changes in portfolio composition in trading-related industries is considered. The research uses quotations from companies from the trading sector of the Warsaw Stock Exchange (WSE). Theoretical considerations are presented in the form of an empirical case study.
    Źródło:
    Operations Research and Decisions; 2023, 33, 4; 155--170
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Project implementation scenario selection for sustainable project and product lifecycle management : application of network data envelopment analysis
    Autorzy:
    Kuchta, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/29432381.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    network DEA
    sustainable project management
    desirable inputs
    undesirable outputs
    Opis:
    A method has been proposed to select one of several project implementation variants in the context of sustainable project management. The method should be applied in the phase of the project definition. The projects are viewed across the entire lifecycle of the project and its product. In all the phases, the sustainability aspects should be addressed in a balanced way. The sustainability context implies that different stakeholders will have conflicting opinions on the weights of different variables. The proposed approach is based on network Data Envelopment Analysis that does not require the weights of individual variables as input. Consequently, the proposed method is the first approach allowing users to select a project implementation variant in the context of sustainability and the entire project and product lifecycle, without imposing the weights of individual variables. The proposal is designed for organisations using project sustainable management.
    Źródło:
    Operations Research and Decisions; 2023, 33, 4; 133--154
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimising pedestrian flow in a topological network using various pairwise speed-density models
    Autorzy:
    Khalid, Ruzelan
    Nawawi, Mohd Kamal Mohd
    Ishak, Nurhanis
    Baten, Md Azizul
    Powiązania:
    https://bibliotekanauki.pl/articles/29127975.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    topological network
    speed-density model
    optimal arrival rate
    network flow model
    pedestrian flow
    Opis:
    A speed-density model can be utilised to efficiently flow pedestrians in a network. However, how each model measures and optimises the performance of the network is rarely reported. Thus, this paper analyses and optimises the flow in a topological network using various speed-density models. Each model was first used to obtain the optimal arrival rates to all individual networks. The optimal value of each network was then set as a flow constraint in a network flow model. The network flow model was solved to find the optimal arrival rates to the source networks. The optimal values were then used to measure their effects on the performance of each available network. The performance results of the model were then compared with that of other speed-density models. The analysis of the results can help decision-makers understand how arrival rates propagate through traffic and determine the level of the network throughputs.
    Źródło:
    Operations Research and Decisions; 2023, 33, 4; 53--69
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Success of research projects : prediction and assessment from the point of view of project stakeholders thereby taking into account a sustainability approach
    Autorzy:
    Klaus-Rosińska, Agata
    Iwko, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/29127983.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    project success
    success factor
    success criteria
    research project
    project stakeholder
    sustainable approach
    Opis:
    The aim of the article is to present the results of research on the success of research projects. Based on the conducted quantitative research, the importance of individual success factors and success criteria of research projects were determined, taking into account the opinions of various stakeholders thereby a sustainable approach. The research results indicate the high importance of most of the success factors and the success criteria of research projects pointed out in the literature and those in turn are important for project management and supports decision-making.
    Źródło:
    Operations Research and Decisions; 2023, 33, 4; 97--118
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of COVID-19 and cancer data using new half-logistic generated family of distributions
    Autorzy:
    Khan, Sadaf
    Tahir, Muhammad H.
    Jamal, Farrukh
    Powiązania:
    https://bibliotekanauki.pl/articles/29127967.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    half-logistic distribution
    generalized family
    likelihood estimation
    bio-medical data
    Frechet distribution
    Opis:
    We focus on a specific sub-model of the proposed family that we call the new half logistic-Fréchet. This sub-model stems from a new generalisation of the half-logistic distribution which we call the new half-logistic-G. The novelty of proposing this new family is that it does not include any additional parameters and instead relies on the baseline parameter. Standard statistical formulas are used to show the forms of the density and failure rate functions, ordinary and incomplete moments with generating functions, and random variate generation. The maximum likelihood estimation procedure is used to estimate the set of parameters. We conduct a simulation analysis to ensure that our calculations are converging with lower mean square error and biases. We use three real-life data sets to equate our model to well-established existing models. The proposed model outperforms the well-established four parameters beta Fréchet and exponentiated generalized Fréchet for some real- -life results, with three parameters such as half-logistic Fréchet, exponentiated Fréchet, Zografos–Balakrishnan gamma Fréchet, Topp–Leonne Fréchet, and Marshall–Olkin Fréchet and two-parameter classical Fréchet distribution.
    Źródło:
    Operations Research and Decisions; 2023, 33, 4; 71--95
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous pickup and delivery model suggestion for personnel transportation in COVID-19 pandemic conditions
    Autorzy:
    Köse, Erkan
    Kokmazer, Ahsen
    Vural, Danışment
    Gökceoğlu, Gökçe Gül
    Şavlı, Pınar
    Powiązania:
    https://bibliotekanauki.pl/articles/29127991.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optimization
    mathematical modeling
    vehicle routing
    simultaneous pickup problem
    delivery problem
    Opis:
    The impact of COVID-19 on the transportation costs of a large-scale company has been examined. Before the pandemic, shift personnel were transported to the factory by shuttles, and after a quick shift change, other shift personnel were transported back to their homes. However, with the implementation of laws mandating the reduction of shuttle seat capacities, transportation costs have risen significantly. To address this issue, a new simultaneous pickup and delivery model is proposed as an alternative to the separate transportation of shift workers. The results of this study indicate that the proposed model provides a substantial advantage in terms of both the number of vehicles used and the total distance traveled, leading to a significant reduction in costs. This research underscores the importance of effective operations research practices for the profitability of companies, particularly in extraordinary circumstances such as the COVID-19 pandemic.
    Źródło:
    Operations Research and Decisions; 2023, 33, 4; 119--131
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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