Wyniki wyszukiwania - Biblioteka Nauki

1

New method for the estimation of homogeneity of individual judgements in psychoacoustical experiments

100%

Aranowska E. , Manturzewska M. , Rogowski P.

Archives of Acoustics

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2007

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tom Vol. 32, No. 3

729--735

EN

This paper presents a new indicator for the estimation of homogeneity of individual judgements in psychoacoustical experiments. The indicator may be also used in studies from other fields in which the judgements are obtained in the form of numerical values. Two examples of the application of the new indicator have been discussed: one for the assessment of cohesion of listeners’ judgements in a psychoacoustical experiment conducted with the use of the method of absolute magnitude estimation and the other one for the assessment of homogeneity of marks given by jury members in a music competition. In the latter case, a new aggregate measurement tool was also proposed for ranking of competition participants.

2

Ocena informacji parametrycznych aparatów latających typu 3M8M3

80%

Łukaszewicz J.

Problemy Techniki Uzbrojenia

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2007

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tom R. 36, z. 103

55--65

PL

W artykule przedstawiono wyniki analizy możliwości zastosowania informacji o parametrach pracy aparatury pokładowej rakiet ziemia-powietrze do prognozowania ich stanu technicznego.

EN

The results of analysis to use the technical data acquired from the onboard units of the antiaircraft missile to extend its service life time are presented in the paper.

3

Sto posiedzeń Komitetu Technicznego 222 – w interpretacji statystycznej

80%

Błaszkiewicz Z.

Nafta-Gaz

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2010

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tom R. 66, nr 6

507-512

PL

W artykule przedstawiono – w ujęciu statystycznym – tematykę stu posiedzeń Komitetu Technicznego 222 ds. Przetworów Naftowych i Cieczy Eksploatacyjnych, które odbyły się w ciągu 15 lat pracy Komitetu. Omówiono zmiany, które miały miejsce w systemie krajowej normalizacji na przestrzeni tego okresu, zaprezentowano strukturę Komitetu, a także przedstawiono i przeanalizowano pod względem rodzajów omawianych norm prace wszystkich czterech podkomitetów działających w ramach Komitetu Technicznego 222: ds. Paliw Płynnych, ds. Asfaltów, ds. Olejów Smarowych i ds. Cieczy Specjalnych. Przedstawiono udział poszczególnych rodzajów (w aspekcie normalizacyjnym) wprowadzanych norm. Zestawiono liczbę posiedzeń Komitetu i liczbę omawianych tematów w kolejnych latach pracy Komitetu. W podsumowaniu statystycznym tematyki prac Komitetu zestawiono i przeanalizowano liczbę zatwierdzonych norm z zakresu KT 222, w tym udział norm opracowanych w wersji polskiej oraz liczbę wszystkich Norm Polskich zatwierdzonych w tym okresie przez PKN. W podsumowaniu stwierdzono, że statystyka stu posiedzeń odzwierciedla zmiany gospodarcze zachodzące w naszym kraju, a jubileuszowy rok setnego posiedzenia Komitetu był jednocześnie czasem niezwykłego wzrostu efektywności pracy tego zespołu, w aspekcie liczby zatwierdzonych norm w wersji polskiej, wynikającej z wysokiej aktywności Komitetu, możliwej dzięki współdziałaniu z przemysłem rafineryjnym.

EN

The article presents – in statistical terms – topics of the 100 meetings of the Technical Committee 222 for Petroleum Products and Operating Fluids, from the last 15 years of Committee`s work. It discusses the changes that have taken place in the national standardization system during this period. The article presents the structure of the Committee. The article presents and analyzes, in terms of standard types, work of all four subcommittees operating under the Technical Committee 222: for Liquid Fuels, for Bitume, for Lubricating Oils and for Operating Fluids. It presents the share of each type (in terms of standardization) introduced standards. The author of the article compares the number of Committee meetings and the number of topics discussed in the subsequent years of work of the Committee. In summary, the statistical topics of the Committee's work were collated and analyzed the number of approved standards for the KT 222 participated in the standards developed in Polish and the total number of Standards approved by the Polish PKN during this period. It concluded that the statistic of the hundred meetings, reflects the economic changes occurring in our country, and mentions that the jubilee year of the hundredth committee meeting was a time of the unusual efficiency rise of the work over time when the work efficiency of the committee, in aspects of the number of approved standards in the Polish version. It was a result of the high activity of the Committee, which was possible thanks to the cooperation with the refinery industry.

4

Analysis of Influence of Different Types of Separators on Fine Grain Coal Class Enrichment Process in Respect with Qualitative and Quantitative Analysis of Separation Products

80%

Manowska A. , Mazurek M.

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tom R. 19, nr 1

235--243

EN

The Article presents comparative analysis of enrichment process of coal slurry that was conducted with use of different types of spi¬ral coil separators and with consideration of influence of separators construction differences on obtained separation products. The best quality was achieved with feed material density of β=300 g/cm3 for both spirals with ash content of λi= 12,86% for Reichert LD4 and 2,85 λi= 12,86% for Krebs spiral.

5

Data analysis for the identification of Greek distribution channels: the case of organic olive oil

80%

Baourakis G. , Drakos P. , Spyridakis D.

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tom Vol. 26, No. 4

239-254

EN

This study offers an assessment of the distribution channels for olive oil in Greece. Greek and international olive oil markets are examined. An insight into the manufacturing, wholesale and retail sectors of major companies along with their corresponding market shares is also presented. A market survey was conducted by questionnaire in Athens, Thessaloniki and Crete in order to record quantitative data, preferences, purchasing criteria, buying procedures and the attitudes of firms towards both conventionally and organically produced olive oil. Personal interviews with executives from major olive oil companies were carried out. Data analysis using descriptive, univariate and bivariate statistics and correspondence analysis was applied.

6

Between declaration and action – an analysis of the results of research on circular behaviours taken up by the households and perceived benefits from them

80%

Szczygieł E. , Lwowska A. , Hajduk-Stelmachowicz M.

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nr 3

122-133

EN

The main aim of the paper is to analyse and evaluate the possible relation between taking up of the circular behaviours by the households’ members and perceiving the benefits. The paper presents the results of the research conducted among Polish households on the territory of two voivodeships: Podkarpackie and Małopolskie. In the article the authors present the result of the statistical analysis of the frequency of undertaking those behaviours in the households and perception of the benefits. To indicate the possible dependences the Chi2 Test of Independence and The U Mann-Whitney Test were used. Obtained results indicate that undertaking circular behaviours may have an influence on the perceived benefits of varying magnitude. It could be important due to the establishment of support activities aiming at increasing the overall level of circularity among the households (as an economic sector). The originality of the research consists the methodology used and novel questionnaire prepared by one of the authors. The questionnaire joins 9R’s circularity concept (normally used in circularity assessments in business companies) with typically households’ behaviours. This article is the sixth one in the publication series devoted to circular economy and sustainable development matters.

7

Statistical analysis of radiocarbon dates as a tool for reconstruction of the environmental changes

80%

Michczyńska D. J. , Michczyński A. , Pazdur A. , Rotnicki K.

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tom Vol. 11

109-112

EN

Statistical analysis of large sets of 14C dates may be a source of information on global or regional environmental changes. Since the nineteen seventies, an analysis of the frequency distribution on a time scale of 14C-dated samples has been carried out for several selected geographic regions. This paper presents basics of the applied method and examples of cumulative probability density functions constructed for 14C dates of peat from territory of Poland. It is emphasised that preferential sampling plays an important role in such a type of analysis. The problem of absolute age determination has been discussed, too.

8

Statistical analysis and modeling of SIP traffic for parameter estimation of server hysteretic overload control

80%

Abaev P. , Razumchik R. , Uglov I.

Journal of Telecommunications and Information Technology

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2013

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tom nr 4

22--31

EN

The problem of overload control in Session Initiation Protocol (SIP) signaling networks gives rise to many questions which attract researchers from theoretical and practical point of view. Any mechanism that is claimed to settle this problem down demands estimation of local (control) parameters on which its performance is greatly dependent. In hysteretic mechanism these parameters are those which define hysteretic loops. In order to find appropriate values for parameters one needs adequate model of SIP traffic flow circulating in the network under consideration. In this paper the attempt is made to address this issue. Analysis of SIP traffic collected from telecommunication operator’s network is presented. Traffic profile is built. It is shown that fitting with Markov Modulated Poisson Process with more than 2 phases is accurate. Estimated values of its parameters are given.

9

EVA as a Tool for Estimation of Management Eciency and Value Creation in Polish Telecom Sector

80%

Kamieniecki W.

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2016

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tom nr 4

31--38

EN

The paper presents results of empirical study on creation of added value in Polish telecom sector, based on Economic Value Added (EVA) indicator. First, an EVA analysis was performed for publicly traded telecom companies. Next, the e ectiveness of EVA itself in management of telecom companies was evaluated. A statistical analysis was made to investigate dependence between EVA and other indicators of company value, confirming that EVA sign and magnitude are in agreement with indicators based on data from financial books. Finally, the eff ectiveness of using EVA for prediction of market capitalization of telecom companies was investigated. Overall results do not give a clear picture and cannot allow to state that EVA is a better determinant of value of telecom company than financial indicators like Earnings Per Share (EPS).

10

Relationships between flavonoids and selected elements in infusions of medicinal herbs

80%

Konieczynski P. , Arceusz A. , Wesolowski M.

Open Chemistry

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2015

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tom 13

|

nr 1

EN

The aim of the studies was to establish relationships between flavonoids and elements important for human health. Therefore, total contents of flavonoids and phosphorus were determined by UV/Vis methods, flavonoids by HPLC, and Ca, Mg, Fe, Mn, Zn and Cu by FAAS in 68 infusions of medicinal herbs. Total flavonoids content in the aqueous extracts were in the range of 0.26 - 16.40 mg per 100 mL. The mean flavonoid contents (in mg per 100 mL of aqueous extract) were 2.24, 2.01, 1.83, 1.88 for rutin, myricetin, quercetin and kaempferol, respectively. The concentrations of Ca, Mg, P were determined in mg per 100 mL, and of Fe, Mn, Zn and Cu in μg per 100 mL. Total content of flavonoids was weakly correlated with quercetin (r = 0.41), kaempferol (r = 0.53), Cu (r = 0.43), and Ca (r = -0.30). Statistically significant correlations were also found among Cu, Ca, Mn, Zn and Fe. Cluster analysis grouped the studied herbs based on total flavonoids, also four flavonoids and essential elements contents, extracted from the whole population of herbs Sambuci flos, Betulae folium, and Sylibi mariani semen. Principal component analysis confirmed these findings and enabled identification of quercetin, kaempferol, Cu and Fe as the factors responsible for differentiation of the studied material.

11

Statistical analysis of ground-related incidents at airports

80%

Tomaszewska J. , Krzysiak P. , Zieja M. , Woch M.

Journal of KONES

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2018

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tom Vol. 25, No. 3

467--472

EN

In recent years, the aviation sector has been developing dynamically. The constant increase in the number of passengers contributes to an escalation in the number of air operations. This trend is mainly due to the increased traffic not only in airspace but also within airports. The large concentration of aircraft at the largest airports makes ground-flying phases such as taxiing or take-off becoming a challenge for pilots, ground services, and air traffic controllers. An intensive operation of many objects on the airport's manoeuvring areas can lead to collisions between them. Global air traffic is growing constantly, with record numbers of air operations and passengers carried. The probability of a collision increases, which leads not only to the cancellation of the flight but also to the significant costs of the aircrafts repair. The statistical analysis allows to highlight the problems related to the issue of ground collisions at airports and can also confirm the thesis concerning the growth and density of air traffic.

12

The objective method of the evaluation of the visual acuity

80%

Hulewicz A.

International Journal of Electronics and Telecommunications

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2019

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tom Vol. 65, No. 1

39--44

EN

The paper presents the use of visual evoked potentials VEP to the objective assessment of visual acuity. Methods of using visual evoked potentials (VEP) rely on the assessment of changes of the electrical action potentials generated within the cortex. To diagnose the degree of weakening eyesight a series of studies on healthy people and visually impaired ones were made. Electrophysiological studies of the eye, using noninvasive VEP examination allow a noninvasive and objective assessment of visual acuity. The use of visual evoked potentials gives the objectivity in assessment of visual acuity what may be very important in ophthalmology. This particularly may concern children examination, people with mental retardation and suspected of simulation.

13

Number of measurement cycles and accuracy of engine indication process

80%

Adamski W. , Brzozowski K. , Nowakowski J.

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tom Vol. 17, No. 3

9-16

EN

The results of measurements of instantaneous pressure in the cylinder are most often inputs tofurther calculations of the characteristic parameters of the working cycle of the engine. Many repetitions of measurements always feature a degree of unrepeatability in registered cycles, making determination of the so called representative round difficult. The paper considers the problem of estimating the minimal number of measurement cycles for the registration of pressure in order to obtain a representative course ofpressure in the cylinder of an compression ignition engine. Maximum pressure was adopted as an indicator of cycle repeatability. After excluding systematic errors, repetition ofmaximum pressures recorded in subseąuent measurement cycles were analyzed for fixed load and rotation speed of the engine, defining the coefficient ofvariation CV. subsequently, for selected states of the engine the representativeness of the average maximum pressure depending on the number of measurement cycles averaged was examined. full evaluation of the accuracy of the indication process in relation to the number of averaged measurement cycles reauires also determination of the so called expanded uncertainty of the measurement's result. Further analysis including determination of the expanded uncertainty of the measurement result revealed that pressure course averaging over 20 consecutive cycles of measurement is sufficient to obtain a representative cycle.

14

CRIME AND THE STANDARD OF LIVING IN POLAND

80%

Jaworska M. , Szewczyk J. , Czekaj P.

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tom 18

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nr 3

451-462

EN

The purpose of the paper is to conduct a statistical analysis that will examine the problem of crime against the standard of living. The paper attempts to determine the relationship between the level of crime in Poland, and the level of life. A ranking of provinces, determining the level of crime and quality of life, was created. In order to sort the objects the method of multidimensional comparative analysis was used. By using this method, the hierarchy of provinces was created. The research enabled indicating groups of objects that are similar in the examined phenomena.

15

Statistical Analysis of Message Delay in SIP Proxy Server

80%

Abaev P. , Razumchik R. , Uglov I.

Journal of Telecommunications and Information Technology

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2014

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tom nr 4

79--87

EN

Single hop delay of SIP message going through SIP proxy server operating in carriers backbone network is being analyzed. Results indicate that message sojourn times inside SIP server in most cases do not exceed order of tens of milliseconds (99% of all SIP-I messages experience less than 21 ms of sojourn delay) but there were observed very large delays which can hardly be attributed to message specic processing procedures. It is observed that delays are very variable. Delay components distribution that is to identied are not exponentially distributed or nearly constant even per message type or size. The authors show that measured waiting time and minimum transit time through SIP server can be approximated by acyclic phase-type distributions but accuracy of approximation at very high values of quantiles depends on the number outliers in the data. This nding suggests that modeling of SIP server with queueing system of GjPHjc type may server as an adequate solution.

16

A statistical analysis of satirical Amazon.com product reviews

80%

Skalicky S. , Crossley S.

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nr 3

EN

A corpus of 750 product reviews extracted from Amazon.com was analyzed for specific lexical, grammatical, and semantic features to identify differences between satirical and non-satirical Amazon.com product reviews through a statistical analysis. The corpus contained 375 reviews identified as satirical and 375 as non-satirical (750 total). Fourteen different linguistic indices were used to measure features related to lexical sophistication, grammatical functions, and the semantic properties of words. A one-way multivariate analysis of variance (MANOVA) found a significant difference between review types. The MANOVA was followed by a discriminant function analysis (DFA), which used seven variables to correctly classify 71.7 per cent of the reviews as satirical or non-satirical. Those seven variables suggest that, linguistically, satirical texts are more specific, less lexically sophisticated, and contain more words associated with negative emotions and certainty than non-satirical texts. These results demonstrate that satire shares some, but not all, of the previously identified semantic features of sarcasm (Campbell & Katz 2012), supporting Simpson’s (2003) claim that satire should be considered separately from other forms of irony. Ultimately, this study puts forth an argument that a statistical analysis of lexical, semantic, and grammatical properties of satirical texts can shed some descriptive light on this relatively understudied linguistic phenomenon, while also providing suggestions for future analysis.

17

Statistical estimation of the dynamics of watershed dams

80%

Tabor Z.

|

nr 2

349-360

EN

In the present study the notion of watershed contour dynamics, defined within the framework of mathematical morphology, is examined. It is shown that the dynamics are a direct measure of the “sharpness” of transition between neighboring watershed basins. The expressions for the expected value and the statistical error of the estimation of contour dynamics are derived in the presence of noise, based on extreme value theory. The sensitivity of contour dynamics to noise is studied. A statistical approach to the notion of contour dynamics is developed and a definition of statistical dynamics is proposed.

18

Lake bed classification using acoustic data

80%

Yin K. K. , Li X. , Bonde J. , Richards C. , Cholwek G.

Applied Mathematics and Computer Science

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1998

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tom Vol. 8, no 4

841-864

EN

As part of our effort to identify the lake bed surficial substrates using remote sensing data, this work designs pattern classifiers by multivariate statistical methods. Probability distribution of the preprocessed acoustic signal is analyzed first. A confidence region approach is then adopted to improve the design of the existing classifier. A technique for further isolation is proposed which minimizes the expected loss from misclassification. The devices constructed are applicable for real-time lake bed categorization. A minimax approach is suggested to treat more general cases where the a priori probability distribution of the substrate types is unknown. Comparison of the suggested methods with the traditional likelihood ratio tests is discussed.

19

Determining the waterway parameters based on statistical data from simulation trials by means of regression method

80%

Gucma L.

|

tom No. 2

37-45

EN

Paper presents method of determining waterway parameters by means of multiple and linear regression method. The statistical data from computer simulation model are applied to determine waterway parameters. The method can be used for designing water areas and is more accurate than analytical method and less expensive than simulation one.

20

The use of statistical analysis for estimation of positional accuracy of large-scale digital maps

80%

Doskocz A. , Doskocz A.

Geodesy and Cartography

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2005

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tom 54

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nr 3