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    Tytuł:
    Transforming Source Code to Mathematical Relations for Performance Evaluation
    Autorzy:
    Izadkhah, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/106274.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    Distributed Software Systems
    source code
    speed up
    Discrete Time Markov Chains
    Opis:
    Assessing software quality attributes (such as performance, reliability, and security) from source code is of the utmost importance. The performance of a software system can be improved by its parallel and distributed execution. The aim of the parallel and distributed execution is to speed up by providing the maximum possible concurrency in executing the distributed segments. It is a well known fact that distributing a program cannot be always caused speeding up the execution of it; in some cases, this distribution can have negative effects on the running time of the program. Therefore, before distributing a source code, it should be specified whether its distribution could cause maximum possible concurrency or not. The existing methods and tools cannot achieve this aim from the source code. In this paper, we propose a mathematical relationship for object oriented programs that statically analyze the program by verifying the type of synchronous and asynchronous calls inside the source code. Then, we model the invocations of the software methods by Discrete Time Markov Chains (DTMC). Using the properties of DTMC and the proposed mathematical relationship, we will determine whether or not the source code can be distributed on homogeneous processors. The experimental results showed that we can specify whether the program is distributable or not, before deploying it on the distributed systems.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2015, 15, 2; 7-13
    1732-1360
    2083-3628
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From quantity to quality: massive molecular dynamics simulation of nanostructures under plastic deformation in desktop and service grid distributed computing infrastructure
    Autorzy:
    Gatsenko, O.
    Bekenev, L.
    Pavlov, E.
    Gordienko, Y. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/305256.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    distributed computing
    desktop grid
    service grid
    speed up
    molecular dynamics
    materials science
    nanocrystal
    plastic deformation
    Opis:
    The distributed computing infrastructure (DCI) on the basis of BOINC and EDGeS-bridge technologies for high-performance distributed computing is used for porting the sequential molecular dynamics (MD) application to its parallel version for DCIwith Desktop Grids (DGs) and Service Grids (SGs). The actual metrics of the working DG-SG DCI were measured, and the normal distribution of host performances, and signs of log-normal distributions of Rother characteristics (CPUs, RAM, and HDD per host) were found. The practical feasibility and high efficiency of the MD simulations on the basis of DG-SG DCI were demonstrated during the experiment with the massive MD simulations for the large quantity of aluminum nanocrystals (Statistical analysis (Kolmogorov-Smirnov test, moment analysis, and bootstrapping analysis) of the defect density distribution over the ensemble of nanocrystals had show that change of plastic deformation mode is followed by the qualitative change of defect density distribution type over ensemble of nanocrystals. Some limitations (fluctuating performance, unpredictable availability of resources, etc.) of the typical DG-SG DCI were outlined, and some advantages (high efficiency, high speedup, and low cost) were demonstrated. Deploying on DG DCI allows to get new scientific quality from the simulated quantity of numerous configurations by harnessing sufficient computational power to undertake MD simulations in a wider range of physical parameters (configurations) in a much shorter timeframe.
    Źródło:
    Computer Science; 2013, 14 (1); 27-44
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamically-adaptive Weight in Batch Back Propagation Algorithm via Dynamic Training Rate for Speedup and Accuracy Training
    Autorzy:
    Al_Duais, M. S.
    Mohamad, F. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/307920.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    artificial neural network (ANN)
    batch back propagation algorithm
    dynamic training rate
    speed up training
    accuracy training
    Opis:
    The main problem of batch back propagation (BBP) algorithm is slow training and there are several parameters need to be adjusted manually, such as learning rate. In addition, the BBP algorithm suffers from saturation training. The objective of this study is to improve the speed up training of the BBP algorithm and to remove the saturation training. The training rate is the most significant parameter for increasing the efficiency of the BBP. In this study, a new dynamic training rate is created to speed the training of the BBP algorithm. The dynamic batch back propagation (DBBPLR) algorithm is presented, which trains with adynamic training rate. This technique was implemented with a sigmoid function. Several data sets were used as benchmarks for testing the effects of the created dynamic training rate that we created. All the experiments were performed on Matlab. From the experimental results, the DBBPLR algorithm provides superior performance in terms of training, faster training with higher accuracy compared to the BBP algorithm and existing works.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 4; 82-89
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Dynamic Characteristics of Vehicles on the Passenger Car Equivalent and Traffic Delay
    Autorzy:
    Fornalchyk, Ye.
    Mohyla, I.
    Hilevych, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411007.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    passenger car equivalent (PCE)
    traffic delay
    traffic light cycle
    saturation flow
    vehicle
    technical condition
    speed up
    Opis:
    The analysis of transportation flow andtechnical condition of cargo-carrying vehicles and buses has showed the need in the research of its influence on the passing density on signalized intersections. The indicator which reflects this influence is represented by light motor vehicle passenger car equivalent (PCE). The need in determining a passenger car equivalent for differently structured transportation flows is demonstrated not according to the recognized methodology, but according to the one developed by the authors which takes into account both diverse structure and the level of technical condition of road users. The latter one decreases launching dynamics of vehicles which depart from the stop line. The respective passenger car equivalents are determined for such a structure of traffic flow. These calculations differ from already known and normative ones. Due to the simulation (the VISSIM program) of passing at an intersection with the use of calculated passenger car equivalents which take into account the technical condition of vehicles, traffic delays on the main direction were defined as decreased by 7.6% for respective duration of permissive signal on a traffic light.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 2; 45-50
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimisation of the topping-up process of lubricating oil in medium-speed marine engines
    Autorzy:
    Młynarczak, Andrzej
    Krzysztof, Rudzki
    Powiązania:
    https://bibliotekanauki.pl/articles/1573592.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    multi-objective optimisation
    medium-speed marine engine
    lubricating oil
    soild impurities
    alkalinity
    topping-up process
    Opis:
    In this paper, we examine the problem of optimising the process of topping up lubricating oil in medium-speed marine engines. This process is one of the methods that can be applied to improve the properties of lubricating oil. The amount of fresh oil added to lubricating oil system always balances its consumption, but the method used to top up depends on the marine engineer. Small amounts of fresh oil can be added at short intervals, or large ones at long intervals, and the element of randomness often plays a significant role here. It would therefore be valuable to find a method that can help the mechanical engineer to choose the right strategy. We apply a multi-criteria optimisation method for this purpose, and assume that the criterion functions depend on the concentration of solid impurities and the alkalinity, which are among the most important aspects of the quality and properties of lubricating oil. These criterion functions form the basis for multi-objective optimisation carried out with the use of the MATLAB computer program.
    Źródło:
    Polish Maritime Research; 2021, 2; 78-84
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of different factors on momentum transfer in mechanically agitated multiphase systems
    Autorzy:
    Cudak, M.
    Kiełbus-Rąpała, A.
    Major-Godlewska, M.
    Karcz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/185715.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiphase system
    agitated vessel
    critical impeller speed
    gas hold-up power
    consumption
    układ wielofazowy mieszalnika
    krytyczne prędkości wirnika
    konsumpcja
    Opis:
    A comparative analysis concerning the influence of different factors on momentum transfer in mechanically agitated systems was carried out on the basis of experimental results for solid-liquid, gas-liquid and gas-solid-liquid systems. The effects of the impeller - baffles system geometry, scale of the agitated vessel, type and number of impellers and their off-bottom clearance, as well as physical properties of the multiphase systems on the critical impeller speeds needed to produce suspension or dispersion, power consumption and gas hold-up were analysed and evaluated.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 1; 41-53
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Udział gazu zatrzymanego w cieczy dla układu gaz-ciecz w mieszalniku z dwoma mieszadłami
    Hold-up for gas-liquid system in an agitated vessel with two impellers
    Autorzy:
    Cudak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073288.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mieszanie
    udział gazu zatrzymanego w cieczy
    układ gaz-ciecz
    mieszadło
    mixing
    gas hold-up
    gas-liquid system
    high-speed impeller
    Opis:
    Badania miały na celu określenie wpływu wybranych parametrów (natężenia przepływu gazu, częstości obrotów mieszadła, stężenia wodnego roztworu sacharozy oraz konfiguracji mieszadeł) na udział gazu zatrzymanego w cieczy dla układu gaz-ciecz. Badania wykonano w mieszalniku o średnicy 0,288 m z dwoma mieszadłem szybkoobrotowym. Wyniki badań opracowano w postaci równania. Na podstawie przeprowadzonych pomiarów stwierdzono, że udział gazu zatrzymanego w cieczy silnie zależy od natężenia przepływu gazu oraz stężenia sacharozy w wodnym roztworze.
    Studies of different param eters influence (gas flow rate, impeller speed, sucrose concentration in aqueous solution and configuration of impellers) on the gas hold-up for gas-liquid systems are presented in the paper. Measurements were conducted in a vessel of diameter equal to 0.288 m, equipped with two high-speed impellers. The results of experiments were described by the equation. The study shows that gas hold-up strongly depends on the gas flow rate and sucrose concentration in aqueous solution.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2018, 4; 93--94
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mieszanie układu trójfazowego ciecz - gaz - ciało stałe w zbiorniku z jednym lub dwoma mieszadłami
    Gas - solid - liquid system mixing in a vessel equipped with one or two impellers
    Autorzy:
    Kiełbus-Rąpała, A.
    Karcz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2070833.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    układ ciecz-gaz-ciało stałe
    krytyczna częstość obrotów mieszadła
    udział gazu zatrzymanego w cieczy
    gas-solid-liquid system
    critical impeller speed
    gas hold-up
    Opis:
    Celem prezentowanej pracy była analiza eksperymentalna hydrodynamiki układu ciecz - gaz - ciało stałe w aparacie z jednym lub dwoma mieszadłami. Przeprowadzona analiza pozwoliła na określenie wpływu różnych parametrów fizycznych, operacyjnych oraz geometrycznych na krytycznej częstości obrotów mieszadła, mocy mieszania, udziału gazu zatrzymanego w cieczy oraz czasu przebywania pęcherzyków gazu w układzie.
    The aim of this research was the experimental analysis of gas - solid — liquid systems hydrodynamics in an agitated vessel equipped with one or two impellers. The results of analysis enabled one to determine an influence of various physical parameters of liquid phase and operational and geometrical parameters on critical impeller speed, power consumption, gas hold-up and gas bubbles residence time in the system.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2009, 6; 104-106
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uwarunkowania stopnia zwrotu ankiet pocztowych w Polsce w świetle badań eksperymentalnych
    Factors conditioning the return rate of mailed questionnaires in the light of experimental studies
    Autorzy:
    Gorbaniuk, Oleg
    Powiązania:
    https://bibliotekanauki.pl/articles/1857658.pdf
    Data publikacji:
    2001
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
    Tematy:
    ankieta pocztowa
    stopień zwrotu
    szybkość zwrotu
    anonimowość
    loteria
    temat
    długość
    zawiadomienie
    sponsor
    przypomnienie
    powtórne wysłanie
    premia
    mail survey
    return rate
    return speed
    anonymity
    lottery
    subject
    length
    prenotification
    sponsorship
    postcard follow-up
    second mailing
    incentive
    Opis:
    The basic task of the experimental studies related in the article was to learn about the specificity of the Polish population as far as response of potential respondents is concerned to marketing research conducted with the use of the method of postal survey. To this end significance of effect of 15 variables on the return rate of the questionnaires was checked. The variables were distinguished on the basis of analysis of the relevant literature as well as of study results and Polish university teachers' experiences. A900 person random sample was drawn with the help of acomputer algorithm that was representative of the whole of adult Lublin residents with respect to age and sex. The whole drawn sample was divided into 16 experimental groups, each group numbering 50 subjects, and one control numbering 100 subjects. Each of the distinguished groups represented a different variable that was studied. The study results show that enclosing an envelope for the reply, reminding of the reply, enclosing a greater sum of money with the questionnaire, and a higher education and older age of the possible respondents had a positive effect on the percentage of returned questionnaires. The percentage was decreased when the envelopes containing the questionnaires were franked, the volume of the questionnaires was bigger, the survey was under the auspices of a private study centre, the subject was prenotified about his participation in the survey and when too small a sum of money was offered for the participation (50 gr). However, such variables as the subject of the survey, anonymity of the respondents, a repeated dispatch of the questionnaires, lottery and the sex of the respondents did not have a significant effect on the degree of return in the light of the obtained results. If anonymity was not guaranteed, or respondents were offered taking part in the study in return for filling in the questionnaire, and in the case of female respondents we can only talk about tendencies to decrease the return rate.
    Źródło:
    Roczniki Nauk Społecznych; 2001, 1; 241-267
    0137-4176
    Pojawia się w:
    Roczniki Nauk Społecznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stopień zwrotu ankiet pocztowych w badaniach marketingowych w świetle doświadczeń nauczycieli akademickich polskich uczelni
    The Rate of Return of Postal Reviews in Marketing Research in the Light of Experiences of Polish University Professors
    Autorzy:
    Gorbaniuk, Oleg
    Powiązania:
    https://bibliotekanauki.pl/articles/1857969.pdf
    Data publikacji:
    1999
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
    Tematy:
    ankieta pocztowa
    stopień zwrotu
    szybkość zwrotu
    efektywność
    koperta zwrotna
    opłata za przesyłkę
    list motywacyjny
    zawiadomienie
    przypomnienie
    powtórne wysłanie
    sponsor
    długość kwestionariusza
    temat
    gratyfikacja finansowa
    nauczyciele akademiccy
    mail survey
    academics
    response rate
    response speed
    cost effectiveness
    return envelope
    postage
    covering letter
    prenotification
    reminder postcard
    follow-up
    length questionnaire
    topic
    financial gratification
    Opis:
    Postal reviews are widely used in social sciences research because of their great popularity both with respondents and researchers. In Poland postal reviews are used less often than other methods of communication. A low or very low percentage of returned questionnaires is most often mentioned as the reason. This opinion results first of all from not knowing that condition the rate of their return, and particularly from not knowing the cultural peculiarity of Poland in this respect. The sources of this state should be looked for in underestimating the importance of the problem in academic handbooks that only popularise and deepen negative stereotypes about postal review, and in a small number of specialist publications on the variables that are significant for the rate of return in the case of Polish population. In order to fill the existing gap in the knowledge of peculiarity as far as the reaction of potential respondents in Poland is concerned to marketing research with the use of postal review it was decided that opinions and experiences connected with postal review should be collected and analysed. They came from people who occupy themselves in marketing research, first of all in its theoretical aspect, but also having practical knowledge in this field. 89 professors were chosen who specialise in the field of marketing. They were sent aquestionnaire, specially worked out for the study. The questions were concerned, among others, with the peculiar character of postal reviews done by those people. The rate of return after two contacts was 43.7%. The article contains a specification of the rate of return of questionnaires depending on the used factors of review personalisation, financial gratification, the number and form of contacts with respondents and factors connected with the specificity of sending and returning the research materials by respondents. The obtained results are compared and analysed against the background of results of research done in the West. These specifications and analyses may be a good source of hypotheses for future research of cultural conditioning and combination of factors that allow maximising the rate of return of postal review questionnaires in Poland.
    Źródło:
    Roczniki Nauk Społecznych; 1999, 27, 1; 167-181
    0137-4176
    Pojawia się w:
    Roczniki Nauk Społecznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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