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    Wyświetlanie 1-4 z 4
    Tytuł:
    A comparison of prediction efficiency for timber prices in Poland in times of economic crisis with the application of the linear approximation method and brown’s exponential smoothing model
    Autorzy:
    Górna, Aleksandra
    Adamowicz, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2067432.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    forest economics
    market
    price
    prediction
    raw wood
    Opis:
    An analysis was made of two prediction methods: the Linear Approximation Method (LAM) and Brown’s Exponential Smoothing Model (BESM). These two methods were investigated and compared in terms of their efficiency in timber price prediction. Models and price predictions were prepared based on three time series (5-, 7- and 9-year) for three years: 2015, 2016 and 2017. The analyses were conducted using data on mean annual timber prices from the period 2006-2017. This meant that the time series included the years of the 2007-2008 economic crisis. Prediction efficiency was evaluated by comparing the results obtained with actual timber prices in the years 2015-2017. It was found that the predictions generated by LAM were better than those produced by BESM. The smallest relative and absolute errors of prediction were obtained applying the linear function: Υt^ = 5.277t + 161.70. This function was constructed based on a 5-year time series. Absolute error amounted to 1.59 PLN (€0.35). Relative error was below 1%. The results of this work suggest that further studies are desirable to investigate the applicability of trend analysis to the prediction of timber prices with the inclusion of analyses of nonlinear trends. The present results of timber price modelling may provide a basis to search for a homogeneous model of timber price prediction adapted to specific conditions of timber sales.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2021, 64, 208; 135--147
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of trend estimation model in predicting the average selling price of timber
    Autorzy:
    Adamowicz, Krzysztof
    Górna, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/2010868.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    wood economics
    forest economics
    price forecast
    prediction methods
    trend estimation model
    Opis:
    The article analyzes the possibility of adopting trend estimation model to predict the average selling price of timber (CGUS). The study used information about the average selling prices of timber in chosen periods (2006-2017). The data concerning the actual CGUS was used to create a trend estimation model. The models and CGUS predictions were conducted based on three different time series encompassing 5-year periods. The predicted (CGUS) trend estimation in particular years was requested based on extrapolation, which exceeded the accepted set of information used in the study to create a trend estimation model. On the basis of the conducted study it was ascertained that the method of modeling linear trend estimation should be adopted in the price prediction process. The error assessment with which the linear function formulas are burdened, it was noticed that the value of the coefficient of residual variation was between 4.40% and 7.82%. It was also noticed that the linear modeling of CGUS trend estimation, despite unfavorable values of coefficient of determination and convergence, to some extent, can be viewed as an assistance tool in the decisionmaking process in the scope of predicting the height of the analyzed price. This view was supported by the achieved predictions which were verified with the actual prices of timber. The price difference between the actual and the predicted one was between -1.59 PLN to 2.27 PLN, and in relative terms the predictive error was between 0.83 to 1.15%. In our opinion the presented research process can constitute a reference point as a comparative element to verify the results for other, new price prediction models. The process of modeling timber prices should be extended by other predicators which are connected with forest market chain.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2020, 63, 206; 147-159
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complaints root cause analysis as a part of the medical devices quality improvement process
    Autorzy:
    Ziarkiewicz, Aleksandra
    Górna, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1917524.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    complaint
    medical devices
    root cause
    remedial actions
    corrective actions
    skarga
    wyroby medyczne
    pierwotna przyczyna
    działania naprawcze
    Opis:
    Purpose: The purpose of the paper is to present the essence of the complaint handling process as an element of the process of improving the quality of manufactured medical devices, ensuring their safety of use and meeting the declared by the manufacturer efficiency of the medical devices. Detailed analysis of complaints received from the customers in order to identify the root cause of the reported problems allows initiating the appropriate actions by the company. The remedial actions are designed to eliminate defects reported by customers, while the corrective actions are carried out to eliminate the causes of the reported defects. All these actions taken by the company in course of the complaint handling process are the important element influencing not only the effectiveness of the complaint handling process but also improvement of the product, elimination of defects, and thus the safe use of the device by the user. Design/methodology/approach: The analysis of the main causes of the reported failures and actions taken was conducted through a survey questionnaire forwarded to 24 medical device manufacturers in Poland. Findings: The results of this survey allowed to identify the categories of root causes, which are the most frequent reasons for complaints concerning medical devices and to identify the most frequent corrections and corrective actions based on the example of selected companies manufacturing medical devices in Poland. Originality/value: The results of the survey regarding the main causes of the reported failures and actions taken during the complaint handling process may provide guidance for the manufacturers during the evaluation of the reported failures.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2020, 145; 675-683
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Handling of medical devices’ customer complaints on the example of companies based in Poland
    Autorzy:
    Feliczek, Patryk
    Górna, Justyna
    Buszczak, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/27313564.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    customer complaint
    medical device
    containment
    corrective actions
    skarga klienta
    urządzenie medyczne
    powstrzymywanie
    działania naprawcze
    Opis:
    Purpose: The main purpose of this article was to identify and analyze correction activities and corrective actions, taken by medical devices’ companies, as a result of a customer complaint. Design/methodology/approach: The article presents the results of the study conducted among medical devices’ companies, operating on the Polish market. These companies have implemented and certified quality management system in accordance with the requirements of ISO 13485. In addition, these companies, as part of their activities, carry out various processes related to medical devices, but performing production process was the main criteria for qualifying the company for the study. On this basis, 209 companies, meeting these criteria, have been defined. The study was conducted using a survey questionnaire, available in electronic form. As part of the survey, 90 correctly completed survey questionnaires were received, what means that the response rate of surveys reached the level of 43%. Findings: The most important correction activities, indicated by the surveyed companies, include verification of suspicious products throughout the whole supply chain and replacement of a defective product with a new one. From the corrective actions perspective almost 70% of respondents indicated trainings of production employees. This is strongly related to the identified root causes, by these companies, as operators’ errors (50% of the causes lie with such errors). Almost 50% of respondents declared the update of work instructions as a corrective action, which is also related to the high number of indications for operator trainings. Originality/value: The article presents main activities, that are taken by the medical devices’ companies in Poland to increase the safety and performance of medical devices, if an abnormality occurs. The article may be treated as an benchmark for medical devices companies once reviewing their approach to implementing corrections and corrective actions.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 160; 159--172
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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