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Wyświetlanie 1-15 z 77
Tytuł:
The application of archival borehole data to recognizing the primary mineral composition and diagenetic changes in Jurassic sandy rocks of the Polish Basin
Autorzy:
Wróblewska, Sara Marlena
Powiązania:
https://bibliotekanauki.pl/articles/2201221.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
petrofacies analysis
Jurassic sandstones
resistivity log
gamma ray log
spontaneous potential log
Opis:
With emphasis being placed on the re-examining of mature petroleum basins and reduction of the negative impact of the industry on the environment, the use of archival data in geological exploration is essential. This is especially important in regions where the old, Soviet-type tools were used in the past and which are now using modern, western logging equipment. The application of archival geological, geochemical and geophysical data allows recognition of reservoir formations without the use of modern measurements. For the purpose of this research, Jurassic sandy rocks identified in the archival borehole Z-GN4 were analysed. They appear to be a perfect target for further petroleum and geothermal exploration in the Polish Basin; however, variable mineral composition and diagenetic features can cause difficulties while estimating their reservoir properties. The difference between gamma ray and spontaneous potential shale volume parameter (clay difference) was applied together with gamma ray measurement to determine the impact of primary and diagenetic features on each sandy petrofacies. Based on an integration of detailed petrographic analysis of available core samples from Z-GN4 borehole with archival borehole logs, four different sandy petrofacies were distinguished. Moreover, deep resistivity and sonic logs were used to highlight the carbonate-cemented intervals. This study shows how the application of petrofacies analysis in archival datasets can support the interpretation of uncored intervals and upgrade the level of reservoir characterization.
Źródło:
Geological Quarterly; 2022, 66, 3; art. no. 24
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical Log-linear Models for Contingency Tables
Hierarchiczne modele logarytmiczno-liniowe dla tablic kontyngencji
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/906850.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
log-linear models
hierarchical log-linear models
AIC
BIC
Opis:
Log-linear models are widely used for qualitative data in multidimensional contingency tables. Hierarchical log-linear models are models that include all lower-order terms composed from variables contained in a higher-order model term. The starting point is a saturated model, then homogenous associations, conditional independence and complete independence. There are several statistics that help to choose the best model. The first is the likelihood ratio approach, next is AIC and BIC information criteria. In R software there is loglm() function in MASS library and glm in stats library. The first approach is presented in this paper
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2012, 269
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Considerations regarding relationship between tourists satisfaction and destination loyalty
Związek między satysfakcją turystów i lojalnością wobec kierunku podróży
Autorzy:
CIPRIANA MUNTEAN, Andreea
BOGDAN DOBRA, Iulian
Powiązania:
https://bibliotekanauki.pl/articles/1202452.pdf
Data publikacji:
2017-07-24
Wydawca:
Państwowa Uczelnia Stanisława Staszica w Pile
Tematy:
tourist’s satisfaction
number of visits
accommodation units
restaurants
log-log model
ANCOVA
satysfakcja turystów
liczba odwiedzin
kwatery
restauracje
model log-log
Opis:
This study analyse the relationship between tourists satisfaction with destination loyalty in Alba County. The research is based on data collected from a market research contract in the tourism sector in Alba County and the period submitted for analysis is 2013 – 2015, when there have been identified 365 tourists. Regarding the methodology, one can notice that into Equation Estimation, Least Squares Options, we selected “White” for Coefficient covariance matrix. Also, we pointed out Standard deviation for Type weights options, and for Weighted series we selected Log(Expenditure). According to log-log regression model estimation output, 18 predictors determined a decrease (i.e. almost 55% from total predictors) and 15 independent variables determined an increase in the tourists’ number of visits. In terms of the dichotomous variables related to tourist satisfaction, it was highlighted that ten of exogenous cause a positive reaction in Number of Visits and ten of them a negative one. The elasticity of Number of Visits with respect to Log(Expenditure) is about -0.0959, suggesting that if the level of expenditure goes up by 10 percent, on average, the tourists’ number of visits goes down by about 1 percent. Thus, Number of Visits is very responsive to changes both variables related to tourist satisfaction and in personal tourist’s expenditure.
Niniejsze badanie analizuje związek między satysfakcją turystów a ich lojalnością wobec kierunku podróży w okręgu Alba. Badania opierają się na danych zebranych w ramach umowy o badaniach rynku w sektorze turystyki w okręgu Alba. Analiza obejmuje lata 2013–2015 i 365 turystów. Badania pokazały, że 18 predyktorów (tj. prawie 55% wszystkich predyktorów) wpłynęło na spadek, a 15 niezależnych zmiennych wpłynęło na wzrost liczby odwiedzin turystów. Jeśli chodzi o zmienne dychotomiczne związane z satysfakcją turystów, dziesięć zmiennych egzogennych wywołało pozytywną reakcję w liczbie odwiedzin, a dziesięć z nich negatywną. Elastyczność liczby wizyt w odniesieniu do Log(wydatki) wynosi około -0,0959, co sugeruje, że jeśli poziom wydatków wzrośnie średnio o 10 procent, liczba odwiedzin turystów zmniejszy się o około 1 procent. Tak więc liczba wizyt jest bardzo wrażliwa na zmiany zarówno zmiennych związanych z satysfakcją turystyczną, jak i wydatkami turystów indywidualnych.
Źródło:
Progress in Economic Sciences; 2017, 4; 433-454
2300-4088
Pojawia się w:
Progress in Economic Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The occurrence and size of false heartwood in beech timber
Autorzy:
Michalec, Krzysztof
Wąsik, Radosław
Gach, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2201343.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
lower log face
upper log face
timber classification
wood defects
red heartwood
Opis:
The aim of this study was to analyse the occurrence and size of false heartwood in beech timber over the lower and upper log faces. The research was carried out on 350 beech trunks where the presence of false heartwood was found on at least one of the log faces. The research material came from the Jarosław and Lesko Forest District (the Regional Directorate of the State Forests (RDSF) in Krosno) and the Pińczów Forest District (RDSF Radom). The following measurements were taken on selected logs: the mean bottom diameter, the mean upper diameter, the length of the analysed trunks, the maximum diameter of the false heartwood at both ends. As a result of the research, it was found that the maximum diameter of false heartwood on the beech log faces ranges from 30% to 40%, and a statistical test showed no significant difference in the extent of the defect between the lower and the upper face (t = -0.389; df = 612; p-value = 0.697). An analysis of the presence of the examined feature on the log faces showed that there were cases in which false heartwood appeared only over the lower face or only over the upper one. It was also noted that almost half of the examined logs had a larger diameter of the defect over the upper face than over the lower one. This study also examined the existence of a correlation between the diameter of the log face, log length and the percentage of the defect. The statistical test showed no significant correlation for both the lower and the upper face and the log length.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2022, 65, 209; Art. no. 1644-3985.385.08
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detecting Security Violations Based on Multilayered Event Log Processing
Autorzy:
Malec, P.
Piwowar, M.
Kozakiewicz, A.
Lasota, K.
Powiązania:
https://bibliotekanauki.pl/articles/307710.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
HIDS
log analysis
NIDS
syslog
Opis:
The article proposes a log analysis approach to detection of security violations, based on a four layer design. First layer, named the event source layer, describes sources of information that can be used for misuse investigation. Transport layer represents the method of collecting event data, preserving it in the form of logs and passing it to another layer, called the analysis layer. This third layer is responsible for analyzing the logs' content, picking relevant information and generating security alerts. Last layer, called normalization layer, is custom software which normalizes and correlates produced alerts to raise notice on more complex attacks. Logs from remote hosts are collected by using rsyslog software and OSSEC HIDS with custom decoders and rules is used on a central log server for log analysis. A novel method of handling OSSEC HIDS alerts by their normalization and correlation is proposed. The output can be optionally suppressed to protect the system against alarm flood and reduce the count of messages transmitted in the network.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 4; 30-36
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of primary composition and diagenetic mineralization on natural gamma-ray and density logs of Carboniferous sandstones of the Dęblin Formation
Autorzy:
Wróblewska, Sara
Kozłowska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2058639.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
petrofacies analysis
gamma-ray log
density log
diagenetic mineralization
Dęblin Formation
Lublin Basin
Opis:
The Carboniferous sandstone of the Dęblin Formation is one of the targets for the petroleum industry in the Lublin Basin in southeastern Poland. The formation's primary and diagenetic composition makes it difficult to estimate its reservoir properties. Based on a detailed analysis of core and petrographic samples, normalization of gamma-ray and density logs was made with respect to the grain-framework of the rock. Recounted logs were used for distinguishing 4 different sandstone petrofacies. For these petrofacies, ranges of gamma-ray and bulk density values were determined and the impact of primary and diagenetic mineral composition was estimated. The application of this petrofacies method can upgrade the level of reservoir characterization and support the interpretation of uncored intervals.
Źródło:
Geological Quarterly; 2019, 63, 4; 741--756
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Access Logs : Underestimated Privacy Risks
Autorzy:
Glet, Michał
Kaczyński, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/227087.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metadata
privacy
cybersecurity
instant messaging
access log
Opis:
Access logs may offer service providers a lot of information about specific users. Depending on the type of the service offers, the operator is capable of obtaining the user’s IP, location, communication habits, device information and so on. In this paper, we analyze a sample instant messenger service that is operating for a certain period of time. In our sandbox, we gathered enough data to correlate user communication habits with their localization, and even contacts. We show how seriously metadata may impact the user’s privacy and make some recommendations about mitigating the quantity of data collected in connection with this type of services.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 3; 405-410
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STOCHASTIC EQUIVALENCE SCALES IN LOG-NORMAL DISTRIBUTIONS OF EXPENDITURES
Autorzy:
Kot, Stanisław Maciej
Powiązania:
https://bibliotekanauki.pl/articles/453519.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
equivalence scales expenditure distributions
log-normal distribution
Opis:
In the paper, the properties of the stochastic equivalence scales (SES) are analysed when expenditure distributions are log-normal. The SES provides the equivalent distribution of expenditures when the population of households is heterogeneous with respect to such attributes as household size, demographic composition, etc. For log-normal expenditure distributions, the non-parametric SES deflators are proportional to the ration of geometric means in compared distributions. The statistical analysis of expenditure distributions for Poland in the years 2005-2010 shows that these deflators perform quite well.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2013, 14, 1; 276-282
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibility of pore size distribution application to the description of air-entrained concrete porosity structure
Możliwość stosowania rozkładu wielkości porów do opisu parametrów struktury porowatości betonów napowietrzonych
Autorzy:
Wawrzeńczyk, J.
Kozak, W.
Kłak, A.
Powiązania:
https://bibliotekanauki.pl/articles/402006.pdf
Data publikacji:
2014
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
air-entrained concrete
air pore size distribution
log-normal distribution
beton napowietrzony
rozkład wielkości porów powietrza
rozkład log-normalny
Opis:
Air void size and number distribution constitutes a major characteristic, which substantially contributes to building up concrete resistance to cyclic freezing and thawing. The standard pore spacing factor L is based on the Powers model. Due to the assumptions made in the model, it may not be able to represent the real structure of air pores in the concrete. Consequently, it is necessary to look for other methods to describe this structure. The sought model needs to account for variability in sizes of pore chords and pore random spacing in the paste. The paper analyses the distribution type and compares porosity characteristics obtained with measurements, and on the basis of the distribution. The analysis aims to assess if it is possible to substitute chords in the 0 to 400 μm range with their distribution. Another purpose of the analysis is to compare air pore structure parameters obtained by computations on raw data with the results received on the basis of pore size distribution for a given concrete.
Źródło:
Structure and Environment; 2014, 6, 1; 5-12
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Image compression-encryption algorithm combining compressive sensing with log operation
Autorzy:
Chen, R.-L.
Zhou, Y.
Luo, M.
Zhang, A.-D.
Gong, L.-H.
Powiązania:
https://bibliotekanauki.pl/articles/174009.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
image encryption
image compression
compressive sensing
log operation
Opis:
Based on compressive sensing and log operation, a new image compression-encryption algorithm is proposed, which accomplishes encryption and compression simultaneously. The proposed image compression-encryption algorithm takes advantage of not only the physical realizability of partial Hadamard matrix, but also the resistance of the chosen-plaintext attack since all the elements in the partial Hadamard matrix are 1, –1 or log 1 = 0. The proposed algorithm is sensitive to the key and it can resist various common attacks. The simulation results verify the validity and reliability of the proposed image compression-encryption algorithm.
Źródło:
Optica Applicata; 2018, 48, 4; 563-573
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guidelines for recording transport event logs
Autorzy:
Dramski, M.
Powiązania:
https://bibliotekanauki.pl/articles/135068.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
event log
process mining
XES
CSV
data
method
Opis:
A process is an ordered set of related activities taking place in a given time. Processes are present in all branches of the economy, engineering, science, etc. Due to the huge amount of data produced the rapid development of data mining techniques has been observed. Similar methods are also used in the context of processes and are called process mining. The main task of process mining is to create a process model, which is used to reason about the process and to make decisions inside it. The process model may be used to discuss responsibilities, simulations, predictions, etc. The main data structures in process mining are event logs. It is always very important to have correct data which makes creating a reliable process model possible. In this paper the basic guidelines for recording such event logs have been described and conclusions were drawn. The main focus of this research was transport problems.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 53 (125); 102-105
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poverty duration of households of the self-employed
Autorzy:
Sączewska-Piotrowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/425022.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
Kaplan-Meier estimator
log-rank test
poverty duration
Opis:
This study is one of the first attempts to discover how long households in Poland remain in poverty (out of poverty) and whether the time spent in poverty (out of poverty) depends on the socio-economic group of household. The analysis is conducted using panel data collected in the project ”Social Diagnosis” in 2000-2013. We analyze the survivor functions of staying in poverty (out of poverty) using the Kaplan-Meier method. The probability of survival for a long time in poverty is less than in the case of survival out of poverty. It should be noted that a small percentage of households remained in poverty for almost the entire period of the study. We compare the survival functions of staying in poverty (out of poverty) according to the socio-economic groups of households. For this purpose we use the log-rank test. In both cases the survivor functions are significantly different. Households of the self-employed survive longer out of poverty and simultaneously survive shorter in poverty than the other groups of households.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2015, 1 (47); 44-55
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE EFFECT OF RETIREMENT ON PERCEIVED WELL-BEING IN HUNGARY
Autorzy:
Radó, Márta
Powiązania:
https://bibliotekanauki.pl/articles/646765.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
retirement
marginal log-linear models
perceived well-being
Opis:
The effect of retirement on perceived well-being is examined by using three waves of the Hungarian GGS data. The marginal log-linear model, which is a useful, state-of-the art methodological tool for categorical multivariate analysis, is applied to the problem. This paper ascertains that retirement has a significantly negative effect on an individual’s perceived well-being, although after three years of retirement the feeling of well-being starts to increase again. The significant decrease after retirement can be explained by the health and age of the individual, since those in living poor health and retiring at a younger age tend to have lower subjective well-being. Thus retirement and subjective well-being are conditionally independent given health and age. This paper also reveals that the perceived well-being of those who have retired between the first and the second wave is a Markov chain. This means that the perceived well-being measured in the third and the first waves are conditionally independent given the well-being measured in the second wave. The results support the idea that retirement causes a temporary reduction in well-being.
Źródło:
Studia Humanistyczne AGH; 2014, 13, 4
2084-3364
Pojawia się w:
Studia Humanistyczne AGH
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of interpersonal trust of Poles by the principal components analysis and log-linear modeling
Autorzy:
Grześkowiak, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/425118.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
interpersonal trust
principal components analysis
log-linear analysis
Opis:
Interpersonal trust in Poland is found to be at a very low level. This paper aims at the analysis of this phenomenon on the basis of European Social Survey data. Principal components analysis was applied to examine the degree of interpersonal trust in Poland in relation to other countries. Associations of three dimensions of trust, i.e. trustfulness, fairness and helpfulness, were analyzed by log-linear modeling as well as an agreement measure relevant for categorical variables. A composite indicator based on the first principal component scores confirmed the relatively poor social trust of Poles. A moderate agreement on any two of the three facets of this phenomenon was uncovered and in most cases no interactions among all three aspects of interpersonal trust were detected.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2014, 1(43); 74-86
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model Selection Methods in Log-Linear Analysis
Kryteria wyboru modelu w analizie logarytmiczno-liniowej
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/905650.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
log-linear analysis
contingency table
model selection methods
Opis:
The main objective of the study is to examine model selection methods in loglinear analysis. Log-linear analysis is a tool for independence analysis of qualitative data. Cell counts are Poisson distributed and all variables are treated as response. This method allows to analyze any number of variables in a multi-way contingency table. In log-linear analysis we model cell counts, where expected cell frequencies are functions of parameters representing characteristics of the categorical variables and their relationships with each other (interaction). The purpose of this paper is the presentation and comparison of model election criteria. The most popular statistics are chi-square test, likelihood ratio test and information criteria (AIC [Akaike 1973] and BIC [Raftery 1986]) but also Aitkin [Aitkin 1978] method for high dimensional tables.
Analiza logarytmiczno-liniowa jest metodą przeznaczoną do badania zależności pomiędzy zmiennymi niemetrycznymi w tablicy kontyngencji. Zmienne o rozkładzie Poissona traktowane są jako zmienne objaśniane. Metoda ta pozwala na analizę dowolnej liczby zmiennych, a także na uwzględnienie interakcji zachodzących pomiędzy nimi. W analizie logarytmiczno-liniowej modelowane są liczebności w poszczególnych komórkach tablicy, przy czym liczebności oczekiwane są funkcją parametrów reprezentujących zmienne dyskretne oraz relacje między nimi. Celem niniejszego artykułu jest prezentacja i porównanie kryteriów wyboru modelu w analizie logarytmiczno-liniowej. Podstawowymi kryteriami wyboru modelu są statystyka chikwadrat oraz iloraz wiarygodności oraz kryteria informacyjne AIC i BIC. W niniejszym artykule zaprezentowana zostanie także metoda Aitkina, która przeznaczona jest do porównywania jakości dopasowania modeli o dużej liczbie zmiennych.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 285
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
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