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Wyświetlanie 1-15 z 15
Tytuł:
Performance Analysis of Vertical Handoff Metrics using Variance Based Algorithms
Autorzy:
Bijwe, A.
Dethe, C. G.
Powiązania:
https://bibliotekanauki.pl/articles/108786.pdf
Data publikacji:
2015
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
SAW
TOPOSIS
GRA
MEW
Opis:
Vertical handover is the evolving concept in 4G for seamless communication between heterogeneous networks. In this paper, our main objective is to analyze handover between two WLAN, two Wimax, two UMTS networks. The vertical handover decision is taken based on the variance based algorithm, which calculates the variance of parameters such as delay, jitter, bandwidth and packet loss for various above mentioned networks and the network with most of the parameters with minimum variance is selected. This algorithm is also compared with other algorithms such as MEW (Multiplicative experiment weighting), SAW (Simple Additive Weighting), TOPOSIS (Technique for order preference by similarity to ideal solution) and GRA (Grey Relational Analysis). These algorithms are appropriate for different traffic classes. Simulation results for proposed variance based algorithm in Matlab is discussed and compared with other Multiple attribute decision making algorithm basis of bandwidth; jitter, delay etc. are discussed in the paper. It can be seen that the proposed variance algorithm gives less packet delay than all the algorithms, Jitter is also is least than all the other algorithms.
Źródło:
Journal of Applied Computer Science Methods; 2015, 7 No. 1; 33-42
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of airside aerodrome infrastructure by SAW method with weights from Shannons interval entropy
Autorzy:
Żak, Jolanta
Gołda, Paweł
Cur, Krzysztof
Zawisza, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2067399.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
entropy
aerodrome infrastructure
SAW
Opis:
Multi-criteria decision support (MCDM) methods are widely used in many areas of science. This applies to economic, social and technical sciences. Implementing activities at the strategic, tactical or operational level requires appropriate tools to support decision-makers. The use of these tools requires the preparation of a decision model along with the formalization of the goal and the acquisition and preparation of data to make the decision accurate. Due to the wide application of MCDM in engineering practice, the article presents their application in air transport. It is an area that is constantly evolving, and all decisions at the strategic level have long-term effects and must be adequately justified. In the paper a compartmental extension of the classical SAW method with weights obtained using the compartmental Shannon entropy was proposed. This paper presents issues concerning the choice of airport layout and describes the problems that occur in determining the cost and capacity of airports. This paper reviews the literature on airport capacity and operations and airside air transport processes and the application of various multi-criteria decision support methods to airport problems. The main part of the article contains an optimization mathematical model aimed at determining the parameters of the elements comprising the airport, on the basis of which a simulation model was developed and a modified method of multi-criteria evaluation of SAW taking into account the interval numbers was presented, in which the set of weights was estimated by the Shannon entropy method. In the application part for 3 variants of the airport arrangement, the parameters were determined in the form of interval numbers and then evaluated using the presented method. The presented numerical example shows that the proposed method is an excellent tool to assist in solving complex decision problems where the data are imprecise and represented by interval numbers.
Źródło:
Archives of Transport; 2021, 60, 4; 171--185
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Sensitivity of SAW Structure to the Effect of Toxic Gases
Autorzy:
Hejczyk, T.
Pustelny, T.
Wszołek, B.
Jakubik, W.
Maciak, E.
Powiązania:
https://bibliotekanauki.pl/articles/177695.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface acoustics wave SAW
SAW
Ingebrigtsen’s formula
gas diffusion equations
gaseous acoustic sensors
numerical analyses of SAW structures
Opis:
The paper presents the results of numerical analysis of the SAW gas sensor in the steady and non-steady states. The effect of SAW velocity changes vs surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. The Knudsen’s model of gas diffusion was used. Numerical results for the effect of gas CH4 on layers: WO3, TiO2, NiO, SnO2 in the steady state and CH4 in the non-steady state in recovery step in the WO3 sensing layer have been shown. The main aim of the investigation was to study thin film interaction with target gases in the SAW sensor configuration based on simple reaction-diffusion equation. The results of the numerical analysis allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness, operating temperature, and layer type. The numerical results basing on the code elaborated numerical system (written in Python language), were analysed. The theoretical results were verified and confirmed experimentally.
Źródło:
Archives of Acoustics; 2016, 41, 4; 747-755
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of technological usefulness of panel production line in shipbuilding process
Autorzy:
Urbański, T.
Graczyk, T.
Taraska, M.
Iwańkowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/259325.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
panel production line
welding technology
SAW
SAW-tandem
GMAW-tandem
FCAW
ship hull
Opis:
This paper presents assessment of technological usefulness of panel production line in prefabrication process of large ship hull sections, in which special attention is paid to producibility of welding operations. Basing on the assessment these authors worked out hierarchy of analyzed sequences of welding technological processes as well as production line stands used for the processes. The assessment was performed on the basis of analysis of a concept of panel production line based on real production lines functioning in shipbuilding industry, as well as technical documentation of typical hull sections of a multi-purpose ferry. The presented analysis took into account impact of technological - constructional parameters onto producibility of welding process of prefabricated sections. Among these parameters the following were numbered: mass of the sections and number of their elements, total length of welds, labour consumption, material consumption as well as linear heat input in welding operations. On the basis of the achieved results, places which worsen effectiveness of production line operation were identified, as a result it was possible to formulate proposals for modernization of flow prefabrication line for hull sections.
Źródło:
Polish Maritime Research; 2018, S 1; 134-144
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of Surface Acoustic Wave Sensors for the Detection and Identification of Toxic Environmental Gases/Vapours
Autorzy:
Panneerselvam, G.
Thirumal, V.
Pandya, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/176789.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
toxic gases
SAW
surface acoustic wave
SAW sensors
E-Nose
electronic nose
gas sensors
selective coating
Opis:
Detection and identification of toxic environmental gases have assumed paramount importance precisely in the defense, industrial and civilian security sector. Numerous methods have been developed for the sensing of toxic gases in the environment ever since surface acoustic wave (SAW) technology came into existence. Such SAW sensors called electronic nose (E-Nose) sensor use the frequency response of a delay line/resonator. SAW device is focused and given importance. The selective coating between input and output interdigital transducers (IDTs) in the SAW device is responsible for corresponding changes in operating frequency of the device for a specific gas/vapour absorbed from the environment. A suitable combination of well-designed SAW delay lines with selective coatings not only help to improve sensor sensitivity and selectivity but also leads to the minimization of false frequency alarms in the E-Nose sensor. This article presents a comprehensive review of design, development, simulation and modelling of a SAW sensor for potential sensing of toxic environmental gases.
Źródło:
Archives of Acoustics; 2018, 43, 3; 357-367
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite Element Analysis of SAW Sensor with ZnO Substrate for Dichloromethane (DCM) Gas Detection
Autorzy:
Moustafa, Mohamed
Laouini, Ghaylen
Alzoubi, Tariq
Powiązania:
https://bibliotekanauki.pl/articles/1945651.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
surface acoustic wave
SAW
gas sensors
VOCs
FEM modelling
Opis:
A SAW gas sensor based on Zinc Oxide (ZnO) piezoelectric substrate is simulated and evaluated for the detection of the dichloromethane (DCM) volatile organic compound (VOC). The study is performed based on the finite element method (FEM) using COMSOL Multiphysics software. The obtained device response using the ZnO substrate is compared to the one using the typical lithium niobate (LiNbO3) piezoelectric substrate. A thin film of polyisobutylene (PIB) membrane is selected to act as the sensing layer. The obtained results reveal a linear behaviour of the resonance frequency downshift (i.e., the sensor sensitivity) versus the investigated gas concentrations varying from 10 ppm to 100 ppm of DCM gas. Additionally, the sensor response is investigated by applying several thicknesses of PIB ranging from 0.3 µm to 1.0 µm. The observed sensor response shows less dependence on the PIB thickness using the ZnO substrate than the LiNbO3 one.
Źródło:
Archives of Acoustics; 2021, 46, 3; 419-426
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GIS based modeling of GWQ assessment at Al-Shekhan area using AHP and SAW techniques
Autorzy:
Ahmed, Mohammed F.
Faisal, Raid M.
Powiązania:
https://bibliotekanauki.pl/articles/118718.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
AHP
SAW
GWQ
Al-Shekhan area
GIS
based model
Opis:
There is a continuous need to assess Groundwater Quality (GWQ) for human beneficial uses especially in areas suffering a shortage of nearby surface water. This study aims to assess GWQ of 56 wells located at Al-Shekhan area for drinking, irrigation, and livestock purposes. Analytical Hierarchical Process (AHP) technique is used to extract weights of parameters that are needed in the calculation of Simple Additive Weighting (SAW) technique. Maps are created using Geographical Information Systems (GIS), and these maps shows the classes of suitable areas for each purpose depending upon the calculated indices which are extracted from SAW technique. The results show that the final map classifies the suitable parts according to the drinking, irrigation and livestock purposes, and it shows that the north eastern part of the studied area is suitable for irrigation and livestock only. A model of GIS and AHP is built to assess the suitability of GWQ in Al-Shekhan area, and can be a raw model to be applied to assess GWQ in any other area after inserting the values of their parameters.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 2; 172-183
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The performance assessment of reverse osmosis stations at Al-Mahalabea area
Autorzy:
Ahmed, Mohammed F.
Powiązania:
https://bibliotekanauki.pl/articles/118750.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
brackish water
desalination
membrane technology
reverse osmosis
SAW
TOPSIS
Opis:
The present study assesses RO stations at four sites in Al-Mahalabea area – Nineveh governorate, Iraq during the summer of 2013. The performance of RO stations are ranked by two methods: the Simple Additive Weight (SAW) and the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). Two groups of samples were collected from feed and permeate water for two periods (at zero time of operation and after ten weeks of operation) with eleven parameters for each sample were analysed. The highest overall rejection R efficiency appeared with the first set of parameters more than 90% (SO4, TDS, NO3, TH, and turbidity), while the second set was the least (Cl, Na, and total alkalinity – TA) ranged between 65 and 85%. It is observed that both the SAW and the TOPSIS methods are accurate to predict the performance efficiency.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 3; 332-342
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czujnik lepkości cieczy z akustycznym modem płytowym na niebianie litu o orientacji YZ
Acoustic plate mode viscosity sensor on LiLbL3 YZ
Autorzy:
Wróbel, T.
Hechner, J.
Powiązania:
https://bibliotekanauki.pl/articles/192246.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
Tematy:
czujnik lepkości
powierzchniowa fala akustyczna
LiNbO3
viscosity sensor
SAW
Opis:
W artykule przedstawiono wyniki badań wpływu lepkości akustycznej cieczy na własności wybranego akustycznego modu płytowego w niobianie litu o orientacji YZ, oraz konstrukcję i parametry czujnika lepkości cieczy.
Experimental results of the influence of liquid viscosity on the characteristics of acoustic plate mode (APM) on LiNbO3 YZ have been presented. The structure and parametres of an acoustic plate mode (APM) sensor for liquid viscosity measurement have been reported.
Źródło:
Materiały Elektroniczne; 2011, T. 39, nr 2, 2; 3-7
0209-0058
Pojawia się w:
Materiały Elektroniczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rankingi wielokryteriowe w warunkach zależności liniowej kryteriów – przykład badania ładu środowiskowego w Polsce w roku 2014
Autorzy:
Konarzewska, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/582923.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
rankingi wielokryteriowe
SAW
TOPSIS
MCPC
zależność liniowa kryteriów
metoda głównych składowych
Opis:
W pracy kontynuowane są rozważania na temat konstrukcji wskaźników syntetycznych przy prowadzeniu badań z zakresu wielowymiarowej analizy porównawczej czy też wielokryteriowej analizy dyskretnej (MCDA). Zakłada się najczęściej, że brane pod uwagę kryteria są niezależne. W pracy poddano empirycznej analizie porównawczej, zaproponowaną przez Autora, metodę MCPC tworzenia zmiennej syntetycznej w oparciu o wykorzystanie analizy głównych składowych macierzy kowariancji wartości kryteriów z metodami SAW i TOPSIS. Przeprowadzone badanie dotyczyło wskaźników ładu środowiskowego dla województw Polski w roku 2014 – silnie współzależnych. W pracy pokazano wyniki rankingów oraz zależność zmiennej syntetycznej z metody MCPC od liczby składowych głównych. Badania pokazały, że uzyskiwane za pomocą MCPC rankingi były odporne na sposób ważenia kryteriów. Metodę można traktować jako alternatywę dla innych metod wielokryteriowych, odporną na występowanie zależności liniowych wśród zestawu kryteriów.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2017, 468; 99-107
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deposition of Polymer Sensor Films on SAW Surface by Electrospraying Technology
Autorzy:
Jasek, K.
Pasternak, M.
Grabka, M.
Neffe, S.
Zasada, D.
Powiązania:
https://bibliotekanauki.pl/articles/177125.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Surface Acoustic Wave
SAW
gas sensors
deposition of chemosensitive films
Nafion® films
Opis:
One of the most important problems with regard to the Surface Acoustic Wave (SAW) gas sensors technology is the deposition of chemosensitive films exhibiting desirable chemical and physical properties. The electrospraying technology seems to be a very promising method of the film deposition in this case. It allows the chemosensitive layers to be obtained out of almost any chemicals and their mixtures in a controllable way. The process gives the possibility to generate specific films with properties unattainable if other methods were to be applied. For example, it allows to deposit solutions of polymers and suspensions of solids in polymer solutions which can degrade in the process of thermal evaporation deposition. The paper describes the results of experiments with electrospraying technique in order to obtain Nafion® films. The influence of the process parameters on film sensitivity has been studied.
Źródło:
Archives of Acoustics; 2017, 42, 3; 507-513
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SAW sensor for detection of hydrocarbons. Numerical analysis and experimental results
Autorzy:
Hejczyk, T.
Urbańczyk, M.
Wituła, R.
Maciak, E.
Powiązania:
https://bibliotekanauki.pl/articles/201623.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SAW
gas sensor
piezoelectric substrate
Ingebrigtsen's formula
impedance transformation law
numerical modeling
Opis:
The paper presents the results of numerical analyses of the SAW gas sensor in the steady and non-steady state. The effect of SAW velocity changes vs. the surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. Knudsen's model of gas diffusion was used. Numerical results for the gases CH4, C2H4, C3H8, C6H6 in the steady state and CH4 in the non-steady state in the WO3 sensing layer have been shown. The results of numerical analyzes allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness and operating temperature. Some numerical results were verified in experimental studies concerning methane.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 589-595
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of saw method to support the decisions concerning start-up financing
Autorzy:
Konopka, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2127670.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
economic activity
loans
credit risk modeling
multiple criteria decision methods (MCDM)
SAW
Opis:
The aim of the paper was to present the problem of risk assessment of financing start-ups of individual economic activities as the problem of multi-criteria decision making. The detailed goal of the study was to build a decision model and its empirical verification. Research methodology – The SAW method - was used to build the model based on the concept of the aggregation of the decision-maker's preferences. In the process of building the model, the correspondence analysis was also used. Result – The result of the research is the decision model, the usability of which has been subjected to empirical verification. Originality/value – The model approach proposed in the paper is an original approach for two reasons: Firstly, the correspondence analysis was used in the stage of assigning ranks to verbal or interval variables; Secondly, the use of Cramer's V coefficient to calculate the weightings of criteria and decision sub-criteria was proposed, hence the resulting algorithm of the model should be recognized as the added value of the conducted research.
Źródło:
Optimum. Economic Studies; 2018, 4(94); 242-255
1506-7637
Pojawia się w:
Optimum. Economic Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of renovation functional surfaces of equipments in the mechanical engineering industry
Autorzy:
Brezinová, Janette
Viňáš, Ján
Draganovská, Dagmar
Guzanová, Anna
Brezina, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/118043.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
renovation
continuous casting line
rollers
SAW
wear
renowacja
linia ciągłego odlewania
rolki
zużycie
Opis:
The paper analyzes the possibilities of increasing the lifespan of rollers in continuous steel casting line. There are analyzed the causes of the surface rollers damage and the impact of degrading factors in metallurgical production. Three types of welding consumable electrodes designed for restoration layers formation applied by SAW surfacing technology were analyzed. There were analyzed microstructure, microhardness and properties of weld clads in tribological conditions.
Źródło:
Applied Computer Science; 2018, 14, 2; 60-68
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Physico-Chemical Properties of Submerged Arc Welding Fluxes on Pipeline Steel - A Brief Review
Autorzy:
Sharma, Lochan
Chhibber, Rahul
Powiązania:
https://bibliotekanauki.pl/articles/27313869.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
pipeline steel
submerged arc welding fluxes
SAW
physico-chemical properties
structural integrity issue
mechanical properties
Opis:
Pipeline welding is an integral part of oil and gas exploration industries. Often the welded joint failures were due to lack of weld quality, improper heat treatment and even poor workmanship. Further, the use of new material in pipeline industry puts focus on a better understanding of qualifying requirements of welding for reducing the failures in future. This necessitates the need for development and design of suitable welding fluxes for joining these materials. In this paper an attempt is made to study the effects of submerged arc welding fluxes on weldability as well as structural integrity issues in pipeline steels. Physicochemical and thermophysical properties of submerged arc fluxes widely affects the mechanical behaviour of pipeline steels. This paper presents an overview of the role of welding parameters, flux composition, cooling rate, slag behaviour and physicochemical properties of slag on final welded joint properties such as tensile strength, impact toughness etc. during submerged arc welding.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 409-421
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-15 z 15

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