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    Wyświetlanie 1-11 z 11
    Tytuł:
    Missing Precipitation Data Estimation Using Long Short-Term Memory Deep Neural Networks
    Autorzy:
    Djerbouai, Salim
    Powiązania:
    https://bibliotekanauki.pl/articles/2086428.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    Hodna
    K'sob basin
    missing precipitation data
    long short-term memory
    CCWM
    coefficient of correlation weighting method
    IDWM
    inverse distance weighting method
    Opis:
    Due to the spatiotemporal variability of precipitation and the complexity of physical processes involved, missing precipitation data estimation remains as a significant problem. Algeria, like other countries in the world, is affected by this problem. In the present paper, Long Short-Term Memory (LSTM) deep neural Networks model was tested to estimate missing monthly precipitation data. The application was presented for the K'sob basin, Algeria. In the present paper, the optimal architecture of LSTM model was adjusted by trial-and-error-procedure. The LSTM model was compared with the most widely used classical methods including inverse distance weighting method (IDWM) and the coefficient of correlation weighting method (CCWM). Finally, it was concluded that the LSTM model performed better than the other methods.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 5; 216--225
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Virtual–real fusion maintainability verification based on adaptive weighting and truncated spot method
    Autorzy:
    Ge, Zhexue
    Zhang, Yi
    Wang, Fang
    Luo, Xu
    Yang, Yongmin
    Powiązania:
    https://bibliotekanauki.pl/articles/2200935.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    virtual–real fusion maintainability
    maintainability verification
    adaptive weighting method
    truncated SPOT method
    Opis:
    Maintainability is an important general quality characteristic of products. Insufficient maintainability will lead to long maintenance time and high maintenance cost, thus affecting the availability of products. Maintainability verification is an important means to ensure maintainability meets design requirements. However, the cost of traditional real maintainability verification method is very high, and the virtual maintenance method has insufficient verification accuracy due to the lack of large maintenance force feedback when the human body is moving. In order to reduce the evaluation error and test sample size, the paper conducts maintainability verification based on the mixed physical and virtual maintainability test scenarios. Aiming at the problem that traditional methods are difficult to deal with the real test information and synchronous virtual simulation information in the test process, this study proposes a virtual–real fusion maintainability evaluation algorithm based on adaptive weighting and truncated SPOT (Sequential Posterior Odd Test) method. It can weigh real test information and virtual human simulation information adaptively to obtain a virtual–real fusion maintainability test sample. Then, the SPOT method is used to evaluate the maintainability of small samples. The adjustment of valve clearance, replacement of air filter element and replacement of starting motor maintenance tasks of ship engine are taken as examples for demonstration. The virtual–real fusion and virtual maintainability verification methods are respectively used for verification, and compared with the physical maintenance scenario constructed by 3D printing, indicating that the accuracy of virtual–real fusion maintainability test verification is 89%, while the virtual maintainability verification is only 33%.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 4; 738--746
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Central European geostrategic region’s importance for Europe and world
    Autorzy:
    Kobryński, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/121065.pdf
    Data publikacji:
    2017
    Wydawca:
    Towarzystwo Wiedzy Obronnej
    Tematy:
    power
    Central European Geostrategic Region
    rank-weighting method
    potęga
    Środkowoeuropejski Region Geostrategiczny
    metoda rangowo-wagowa
    Opis:
    This article presents the concept of a Central European Geostrategic Region (CEGR) covering a belt of states located between the Baltic Sea and the Black Sea, and the Baltic Sea and the Adriatic Sea. This region is important for both NATO and the EU, as some of the countries constitute the Eastern wing (border) of these organisations. On the other hand, the states of this region are significant players for Russian Federation’s external policy, which was visible in the previous years. The Central European Geostrategic Region is, therefore, essential for both Central Eastern Europe’s and whole Europe’s security and is of a major importance for Euro-Atlantic and Eurasian Space. This is why the author presents power of CEGR states calculated with rank-weighting method, which partially reflects regional balance of power. As it results from the calculation, the region is characterised with vast diversity of power distribution between individual political units, which in turn impacts foreign and security policies of the states.
    W artykule przedstawiono koncepcję Środkowoeuropejskiego Regionu Geostrategicznego (ŚRG) obejmującego pas państw między przewężeniami bałtycko-czarnomorskim i bałtycko-adriatyckim. Region ten jest istotny z punktu widzenia interesów NATO I UE ponieważ część jego państw stanowi wschodnią flankę (granicę) tych organizacji. Z drugiej strony państwa tego regionu są istotne dla polityki zagranicznej prowadzonej przez Federację Rosyjską, co potwierdzają wydarzenia ostatnich lat. Środkowoeuropejski Region Geostrategiczny odgrywa więc kluczową rolę dla bezpieczeństwa, zarówno Europy Środkowo-Wschodniej jak i całej Europy, a także przestrzeni euroatlantyckiej i euroazjatyckiej. Z tego też względu autor przedstawił potęgę państw ŚRG wyliczoną za pomocą metody rangowo-wagowej, która w pewnym stopniu odzwierciedla regionalny układ sił. Jak wynika z wyliczeń, region ten cechuje się ogromną różnicą w dystrybucji potęgi między poszczególne jednostki polityczne, co z kolei ma wpływ na kształtowanie polityki zagranicznej i bezpieczeństwo tychże państw.
    Źródło:
    Wiedza Obronna; 2017, 1-2; 13-26
    0209-0031
    2658-0829
    Pojawia się w:
    Wiedza Obronna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-objective optimization of dielectric layer photonic crystal filter
    Autorzy:
    Yang, H.
    Huang, C.
    Meng, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/174482.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    filter
    photonic crystal
    weighting factors method
    response surface methodology
    RSM
    Opis:
    The weighting factors method and the response surface methodology are used to achieve multi-objective optimization of a dielectric layer photonic crystal filter. The size of period and the transmission quantity are considered simultaneously and a multi-objective optimization model of filter is established, which takes the size of period and transmission quantity to be minimized in stop-band as objectives. Global approximate expressions of the objective and the constraint functions are found by response surface methodology. Then the weighting factors method is employed to convert the model into a quadratic programming model and the optimal parameters can be obtained using sequence quadratic programming. Examples provide the optimized results in three different weight coefficients. The effect of the weighting factors on the value of the objective function is also discussed. Results show that the present method is precise and efficient for multi-objective optimization of a dielectric layer photonic crystal filter.
    Źródło:
    Optica Applicata; 2017, 47, 1; 29-40
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the moisture change ability of selected crop seeds
    Ocena zdolności zmiany wilgotności wybranych nasion roślin uprawnych
    Autorzy:
    Kornarzyński, K.
    Gładyszewska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/94000.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    seeds
    water collection
    capillary-weighting method
    moisture content
    nasiona
    pobieranie wody
    metoda kapilarno-wagowa
    zawartość wody
    Opis:
    The objective of the paper was to investigate the moisture change ability of bean, broad bean, pea, lupine, radish, beetroot, winter wheat, maize, cucumber, pumpkin and sunflower seeds. Seeds absorbed water in the system for measurement of the water absorption kinetics with the capillary and weighting method. The research results were presented in the form of plots of the relation of kinetics of the moisture change of seeds in the time for the first and second stage of the process which precedes germination. Moreover, the water content in seeds for the time of the end of the second stage of water absorption was determined and the maximum water absorption speed coefficient and the time of its obtaining was calculated. The water content for the end of the 2nd stage of its collection was the highest for seeds which include a hard caryopsis and for broad bean plant seeds. The maximum water absorption speed coefficient was the highest for seeds with low initial moisture - radish, beetroot, cucumber and pumpkin. The measurement of the water absorption speed with the use of the capillary and weighting method enabled investigation of seeds with a varied size, construction of a seed coat and chemical composition for a long period of time to the moment seedlings were obtained.
    Celem pracy było badanie zdolności zmiany wilgotności przez nasiona fasoli, bobu, grochu siewnego, łubinu żółtego, rzodkiewki, buraka ćwikłowego, pszenicy ozimej, pszenżyta, kukurydzy, ogórka, dyni i słonecznika. Nasiona pobierały wodę w układzie do pomiaru kinetyki pobierania wody metodą kapilarno-wagową. Wyniki badań przedstawiono w postaci wykresów zależności kinetyki zmiany wilgotności nasion w czasie dla pierwszej i drugiej fazy procesu poprzedzającej kiełkowanie. Wyznaczono również zawartość wody w nasionach dla czasu końca drugiego etapu pobierania wody oraz maksymalny współczynnik szybkości pobierania wody i czas jego uzyskania. Zawartość wody dla czasu końca II etapu jej pobierania była najwyższa dla nasion zawierających twardą okrywę nasienną oraz dla nasion roślin bobowatych. Maksymalny współczynnik szybkości pobierania wody był najwyższy dla nasion o niskiej wilgotności początkowej - rzodkiewki, buraka, ogórka i dyni. Pomiar szybkości pobierania wody przy wykorzystaniu metody kapilarno-wagowej umożliwił badanie nasion o różnej wielkości, budowie okrywy nasiennej i składzie chemicznym przez długi okres czasu, aż do momentu uzyskania siewek.
    Źródło:
    Agricultural Engineering; 2017, 21, 1; 59-68
    2083-1587
    Pojawia się w:
    Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Repeated weighting in mixed-mode censuses
    Autorzy:
    Szymkowiak, Marcin
    Wilak, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/1837715.pdf
    Data publikacji:
    2021-03-30
    Wydawca:
    Uniwersytet Ekonomiczny w Poznaniu
    Tematy:
    repeated weighting method
    calibration
    Generalised Regression Estimator
    data linkage
    National Census of Population and Housing 2011
    Labour Force Survey
    Opis:
    The main aim of the paper is to use the repeated weighting (RW) method on data from the National Census of Population and Housing 2011 (NCPH) and Labour Force Survey (LFS) to ensure consistency between margins of final tables derived from different statistical sources. This technique, based on different data sources, would en sure consistency between estimates in final output tables. This is the first application of the RW approach on data from official statistics in Poland. The results obtained by applying the RW method to data from the NCPH and additional surveys (e.g. LFS) may be used by Statistics Poland for the formulation of conclusions and recommendations for the upcoming census in 2021. The method may be also considered as an important step towards the production of timely and more detailed statistical information in Poland based on multi-source data infrastructure in general.
    Źródło:
    Economics and Business Review; 2021, 7, 1; 26-46
    2392-1641
    Pojawia się w:
    Economics and Business Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multicriteria approach for selecting the most vulnerable watershed for developing a management plan
    Użycie wielu kryteriów do wyboru najbardziej wrażliwej zlewni w projektowaniu planu zarządzania
    Autorzy:
    Zardari, N. H.
    Naubi, I. B.
    Roslan, N. A. B.
    Shirazi, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/292350.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    relative importance weights
    SMARTER
    SWING
    watershed management targets
    watershed vulnerability
    weighting method
    zarządzanie zlewniami
    Malezja
    metoda SWING
    metoda SMART
    metoda SMARTER
    jakość wody
    Opis:
    Listing of watershed management goals/targets is one of the integral parts of the management plan for a watershed. In this paper, we have listed 18 watershed management targets for which the Malaysian watersheds could possibly be managed in future. Based on the listed watershed management targets, the priority ranking of 18 targets is developed from the relative importance weights obtained from a survey conducted from 29 stakeholders. Three weighting methods (SWING, SMART, and SMARTER) were applied to elicit weights. We found that the SMART (Simple Multi-Attribute Rating Technique) weighting method was a favorable method for eliciting stable sets of weights for the watershed management targets. The SWING weighting method produces better weights than the SMARTER method. The listed watershed management targets will assist watershed managers and decision makers in decision making to use available resources (e.g. water quality, land-use, groundwater, and many other resources) in a more efficient and sustainable manner. The efficient utilization of all resources within a watershed will ultimately save watersheds (more specifically the urbanized watersheds) from further deterioration caused by unchecked infrastructure development activities.
    Określenie celów zarządzania zlewnią jest jedną z integralnych części planu zarządzania. W prezentowanej pracy ustalono 18 celów, do których w przyszłości zmierzać będzie zarządzanie zlewniami Malezji. Na podstawie tych celów ustalono ranking priorytetów, stosując wagi względnego znaczenia uzyskane w wyniku ankietowania 29 udziałowców. Dla uzyskania wag zastosowano trzy metody ważenia (SWING, SMART i SMARTER). Stwierdzono, że metoda SMART (Simple Multi-Attribute Rating Technique) była przydatna do ustalenia zestawu wag dla poszczególnych celów zarządzania zlewnią. Wagi ustalone metodą SWING były bardziej przydatne niż ustalone metodą SMARTER. Uporządkowana lista celów zarządzania będzie pomocna zarządcom i decydentom w podejmowaniu decyzji o wykorzystaniu dostępnych zasobów (jakość wody, użytkowanie ziemi, wód podziemnych i innych) w sposób bardziej efektywny i zrównoważony. Efektywne użytkowanie wszystkich zasobów zlewni uchroni je (szczególnie zlewnie zurbanizowane) od dalszego pogorszenia jakości wskutek niekontrolowanego rozwoju infrastruktury w przyszłości.
    Źródło:
    Journal of Water and Land Development; 2014, 23; 61-68
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nielojalne szable? O badaniu zaplecza prezydenta miasta in spe za pomocą zmodyfikowanej metody AHP
    Disloyal followers? About the study on political base of the mayor in spe using modified method of AHP
    Autorzy:
    Drzonek, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/514435.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Śląski. Wydział Nauk Społecznych
    Tematy:
    mayor
    political preferences
    AHP
    method of weighting the selection preferences
    local elections
    Opis:
    The article contents some results of research on political preferences of candidates for City Council in Szczecin. The survey was done just before the 2014 local elections. In the survey’s results published in this paper, the main object was to determine the relation of candidates for councilors to competition for the mayor of Szczecin. The analysis is focused on the issues of mayor’s potential attributes such as: previous achievements, personal competence, image, party affiliation and program for action in future. Moreover the concentration was also done on preferences of mayor’s candidates: it was very interesting to compare answers on the question who would be better mayor of Szczecin. In the research the modified Analytic Hierarchy Process methods was used. Firstly, the modification, called the method of weighting the selection preferences, showed Piotr Krzystek (mayor of Szczecin since 2006) as a most preferred pretender in 2014 - the majority of party electoral committees recognized him as a second choice candidate. Secondary, each electoral committee had disloyal followers.
    Źródło:
    Political Preferences; 2016, 12; 57-71
    2449-9064
    Pojawia się w:
    Political Preferences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study and Assessment of Low Frequency Noise in Occupational Settings
    Autorzy:
    Shehap, A. M.
    Shawky, H. A.
    El-Basheer, T. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177844.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low frequency noise
    A-weighting
    C-weighting
    audible
    method of assessment
    Opis:
    Low frequency noise is one of the most harmful factors occurring in human working and living environment. Low frequency noise components from 20 to 250 Hz are often the cause of employee complaints. Noise from power stations is an actual problem for large cities, including Cairo. The noise from equipments of station could be a serious problem for station and for environmental area. The development of power stations in Cairo leads to appearing a wide range of gas turbines which are strong source of noise. Two measurement techniques using C-weighted along side the A-weighted scale are explored. C-weighting is far more sensitive to detect low frequency sound. Spectrum analysis in the low frequency range is done in order to identify a significant tonal component. Field studies were supported by a questionnaire to determine whether sociological or other factors might influence the results by using annoyance rating mean value. Subjects included in the study were 153 (mean = 36.86, SD = 8.49) male employees at the three electrical power stations. The (C-A) level difference is an appropriate metric for indicating a potential low frequency noise problem. A-weighting characteristics seem to be able to predict quite accurately annoyance experienced from LFN at workplaces. The aim of the present study is to find simple and reliable method for assessing low frequency noise in occupational environment to prevent its effects on work performance for the workers. The proposed method has to be compared with European methods.
    Źródło:
    Archives of Acoustics; 2016, 41, 1; 151-160
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of movable approximation and wavelet decomposition to smoothing-out procedure of ship engine indicator diagrams
    Autorzy:
    Polanowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/260419.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    smoothing-out the runs
    least squares method
    full-interval approximation
    movable approximation
    decomposition of disturbances
    cut constraints
    glued constraints
    riveted constraints
    broken constraints
    weighting factors
    wavelet decomposition
    Opis:
    In this paper - on the basis of indicator diagram processing taken as an example - were shown possibilities of the smoothing-out and decomposing of run disturbances with the use of the movable multiple approximation based on the least squares criterion. The notion was defined of movable approximating object and constraints used to form approximation features. It was demonstrated that the multiple approximation can be used to decompose disturbances out of an analyzed run. The obtained smoothing-out results were compared with those obtained from full-interval approximation of runs by means of splines as well as wavelet decomposition with using various wavelets, Wavelet Explorer and Mathematica software. Smoothing-out quality was assessed by comparing runs of first derivatives which play crucial role in the advanced processing of indicator diagrams.
    Źródło:
    Polish Maritime Research; 2007, 2; 12-17
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interpolation-based reconstruction methods for tomographic imaging in 3D positron emission tomography
    Autorzy:
    Li, Y.
    Kummert, A.
    Boschen, F.
    Herzog, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/908045.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    rekonstrukcja tomograficzna
    interpolacja dwuwymiarowa
    twierdzenie o przekroju Fouriera
    szereg rozdzielczy
    tomographic reconstruction
    three-dimensional positron emission tomography
    Fourier slice theorem
    frequency sample distribution
    two-dimensional interpolation
    inverse distance weighting
    gridding method
    Opis:
    Positron Emission Tomography (PET) is considered a key diagnostic tool in neuroscience, by means of which valuable insight into the metabolism function in vivo may be gained. Due to the underlying physical nature of PET, 3D imaging techniques in terms of a 3D measuring mode are intrinsically demanded to assure satisfying resolutions of the reconstructed images. However, incorporating additional cross-plane measurements, which are specific for the 3D measuring mode, usually imposes an excessive amount of projection data and significantly complicates the reconstruction procedure. For this reason, interpolation-based reconstruction methods deserve a thorough investigation, whose crucial parts are the interpolating processes in the 3D frequency domain. The benefit of such approaches is apparently short reconstruction duration, which can, however, only be achieved at the expense of accepting the inaccuracies associated with the interpolating process. In the present paper, two distinct approaches to the realization of the interpolating procedure are proposed and analyzed. The first one refers to a direct approach based on linear averaging (inverse distance weighting), and the second one refers to an indirect approach based on two-dimensional convolution (gridding method). In particular, attention is paid to two aspects of the gridding method. The first aspect is the choice of the two-dimensional convolution function applied, and the second one is the correct discretization of the underlying continuous convolution. In this respect, the geometrical structure named the Voronoi diagram and its computational construction are considered. At the end, results of performed simulation studies are presented and discussed.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 1; 63-73
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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