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Wyświetlanie 1-15 z 38
Tytuł:
A Method for Estimating the Least Number of Objects in Fuzzy Clusters
Autorzy:
Viattchenin, D. A.
Yaroma, A.
Powiązania:
https://bibliotekanauki.pl/articles/226222.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
possibilistic clustering
fuzzy cluster
allotment
cluster size
Opis:
The theoretical note deals with the problem of estimation of the value of the least number of objects in fuzzy clusters for following detection of the optimal number of objects in fuzzy clusters through heuristic possibilistic clustering. A technique for detecting the optimal maximal number of elements in the a priori unknown number of fuzzy clusters of the sought clustering structure is reminded and a procedure for finding the initial minimal value of the number of objects in fuzzy clusters is proposed. Numerical examples are considered and conclusions are formulated.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 4; 341-346
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Density Based Clustering to Microarray Data Analysis
Autorzy:
Raczynski, L.
Wozniak, K.
Rubel, T.
Zaremba, K.
Powiązania:
https://bibliotekanauki.pl/articles/226804.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microarrays
cluster analysis
DBSCAN
Opis:
In just a few years, gene expression microarrays have rapidly become a standard experimental tool in the biological and medical research. Microarray experiments are being increasingly carried out to address the wide range of problems, including the cluster analysis. The estimation of the number of clusters in datasets is one of the main problems of clustering microarrays. As a supplement to the existing methods we suggest the use of a density based clustering technique DBSCAN that automatically defines the number of clusters. The DBSCAN and other existing methods were compared using the microarray data from two datasets used for diagnosis of leukemia and lung cancer.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 3; 281-286
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ɵ(1) Time Algorithm for Master Selection in Ad-hoc Wireless Networks
Autorzy:
Khattabi, Mohammed
Elmesbahi, Jelloul
Khaldoun, Mohammed
Errami, Ahmed
Bouattane, Omar
Powiązania:
https://bibliotekanauki.pl/articles/226674.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cluster-based networks
cluster head selection
ad-hoc networks
wireless sensors networks
SDR
USRP
simulink
Opis:
This paper details a hardware implementation of a distributed Ɵ(1) time algorithm allows to select dynamically the master device in ad-hoc or cluster-based networks in a constant time regardless the number of devices in the same cluster. The algorithm allows each device to automatically detect its own status; master or slave; based on identifier without adding extra overheads or exchanging packets that slow down the network. We propose a baseband design that implements algorithm functions and we detail the hardware implementation using Matlab/Simulink and Ettus B210 USRP. Tests held in laboratory prove that algorithm works as expected.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 3; 521-527
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of expectation maximization method for purchase decision-making support in welding branch
Autorzy:
Kujawińska, A.
Rogalewicz, M.
Diering, M.
Powiązania:
https://bibliotekanauki.pl/articles/407123.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cluster analysis
welding process
expectation
maximization method
Opis:
The article presents a study of applying the proposed method of cluster analysis to support purchasing decisions in the welding industry. The authors analyze the usefulness of the non-hierarchical method, Expectation Maximization (EM), in the selection of material (212 combinations of flux and wire melt) for the SAW (Submerged Arc Welding) method process. The proposed approach to cluster analysis is proved as useful in supporting purchase decisions.
Źródło:
Management and Production Engineering Review; 2016, 7, 2; 29-33
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Funkcjonowanie i zasięg oddziaływania przestrzennego klastra „Uzdrowiska świętokrzyskie”
The functioning and scope of spatial interaction of the „Świętokrzyskie Health-Resorts Cluster”
Autorzy:
Barcicki, M.
Gałuszka, G.
Kamińska, W.
Wilk-Grzywna, M.
Powiązania:
https://bibliotekanauki.pl/articles/2031826.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Health-resorts cluster
Polska
spatial extent
Świętokrzyskie voivodeship
Opis:
The aim of the article is to assess the functioning and scope of spatial interaction of the Świętokrzyskie Health-Resorts Cluster. It is one of the younger clusters of this type operating in the country. The study found that cluster functioning was not fully effective as the networks of cooperation and competition were mainly confined to members’ participation in conferences and working meetings. The biggest shortcoming of this cluster is the lack of formalized cooperation of members. Cluster functions as regional and supra-regional. The therapists come mainly from the Świętokrzyskie region and the neighboring regions.
Źródło:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN; 2017, 267; 133-162
0079-3493
Pojawia się w:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of Clustering in Eutectic Microstrcture
Autorzy:
Bortnyik, K.
Barkóczy, P.
Powiązania:
https://bibliotekanauki.pl/articles/356769.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
eutectic
microscopy
image analysis
data mining
cluster analysis
Opis:
The eutectic microstructures are complex microstructures and a hard work to describe it with few numbers. The eutectics builds up eutectic cells. In the cells the phases are clustered. With the development of big databases the data mining also develops, and produces a lot of method to handling the large datasets, and earns information from the sets. One typical method is the clustering, which finds the groups in the datasets. In this article a partitioning and a hierarchical clustering is applied to eutectic structures to find the clusters. In the case of AlMn alloy the K-means algorithm work well, and find the eutectic cells. In the case of ductile cast iron the hierarchical clustering works better. With the combination of the partitioning and hierarchical clustering with the image transformation, an effective method is developed for clustering the objects in the microstructures.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1155-1159
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of pollution sources in the Narew River catchment using multivariate statistical methods
Autorzy:
Ofman, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2141488.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Narew River catchment
pollution sources identification
cluster analysis
Opis:
The aim of the statistical analyses carried out was to identify similarities and to point out differences between the various tributaries of the Narew River, to identify the factors and processes responsible for the transformations occurring in the aquatic environment and finally, to identify the main sources of pollution in the river catchment. For the purposes of statistical analysis, the results of studies conducted as part of diagnostic monitoring by the General Inspectorate for Environmental Protection in 2017–2018 were used. The studies included 8 measurement points located directly on the Narew River and 17 points located on its selected left and right tributaries. Analysis of the collected results indicates that the chemical condition of the water in the Narew catchment is assessed as being poor. This observation may be due to the fact that the Narew catchment is mainly used for agricultural purposes and, in addition, there is a relatively large number of potential anthropogenic sources. As part of the analysis, two potential sources of pollution affecting water quality in the Narew catchment were identified, which include surface run-off and treated wastewater inflow.
Źródło:
Studia Quaternaria; 2022, 39, 1; 23-30
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal of a regional grid cluster model for analysis of electrical power network performance
Autorzy:
Li, Yang
Janik, Przemysław
Schwartz, Harald
Pfeiffer, Klaus
Powiązania:
https://bibliotekanauki.pl/articles/2135739.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
decentralized generation
grid cluster
power balance
regional power grid
Opis:
This paper provides a method for simplified description of a regional power grid model aimed to deliver a grid reduction, and improve grid performance observability. The derived power grid model can be used to analyze the regional allocation of the decentralized energy generation and consumption. The expansion of wind and solar generation in the power system affects the residual load. The power balance between electricity consumption and generation was calculated and analyzed based on the temporal and spatial scales. The proposed grid clustering method is a useful approach for performance analysis in systems with a growing share of renewable generation.
Źródło:
Archives of Electrical Engineering; 2022, 71, 3; 601--613
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tworzenie klastrów dla produktów turystycznych. Przykład Tropical North Queensland w Australii oraz Wschodniego Szlaku Rowerowego Green Velo w Polsce
Creating Clasters for Tourist Products. Examples of Tropical North Queensland in Australia and Wschodni Szlak Rowerowy Green Velo in Poland
Autorzy:
Wilk-Grzywna, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2028838.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Brand tourism product
cluster
co-operation
cycle trail
tourism
Opis:
Eastern Cycle Trail Green Velo has a tremendous potential to become a recognizable brand tourism product for Polish and foreign tourists which will present a strong competition against a wide variety of cycling trails already existing in Poland and Europe. In order to achieve this goal, however, one has to implement an effective management model of Green Velo Trail in the years 2016-2020. A recommended management system for Green Velo trail is the tourism cluster. By implementing a proper management model one will avoid the risk of potential coherence loss, both in marketing and operational aspects of the trail. Moreover, it will allow to introduce competitive tourism offers and sales packages to the market and ensure the so called “project durability”. In developing Green Velo product one should benefit from the experience of the existing clusters which have already achieved a significant marketing and PR success, such as Tourism Tropical North Queenisland. Fully functional tourism product based on the idea of a cluster will fully enhance tourism economy of Eastern Poland.
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2015, 162; 169-183
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptation and Validation of the Steen Happiness Index into Polish
Autorzy:
Kaczmarek, Lukasz D.
Stanko-Kaczmarek, Maja
Dombrowski, Stephan U.
Powiązania:
https://bibliotekanauki.pl/articles/430098.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
happiness
eudaimonic
hedonic
factorial structure
cluster analysis
Polish adaptation
Opis:
Authentic happiness is a construct comprising 3 factors: pleasure, engagement, and meaning (Seligman, Parks, & Steen, 2005). Three studies involving altogether 464 participants adapted and validated the authentic happiness measure Steen Happiness Index (SHI; Seligman, Steen, Park, & Peterson, 2005) into Polish. In Study 1 the Polish version of the scale was developed and its convergence with the original SHI was assessed using bilingual response method, r = .98, p < .001. In Study 2 cluster analysis confirmed the theoretical profiles of happiness, testing the proposed 3-factor structure of the scale, χ2 (116) = 180.62, GFI = .95, CFI=.97, SRMR = .04, RMSEA = .04, RMSEA 90% CI [.25 - .45]. Test-retest reliability (Study 3) yielded satisfactory results, rtt = .87, p < .01. This is the first study providing empirical support for the structural validity of the authentic happiness construct. It also shows the cross-cultural generality of the construct. We discuss some practical applications of the scale.
Źródło:
Polish Psychological Bulletin; 2010, 41, 3; 98-104
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of clustering on the innovativeness of furniture industry
Autorzy:
Grzegorzewska, E.
Niziałek, I.
Olkowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/406772.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovation
furniture industry
cluster initiative
areas
innovation furniture industry
Opis:
The furniture industry in Poland is a rapidly growing area of the economy. The level of innovation strongly influences furniture enterprises competitive position on the market. To support innovation, small and medium furniture industry businesses are affiliate in cluster initiatives. It supports the area of R&D, joint promotional campaigns and financing of new ventures. The paper presents selected furniture industry cluster initiatives that implement policies to support innovation activities of enterprises affiliated to them. In Poland, more and more furniture industry businesses brings together in cluster initiatives that aim to improve their market competitiveness and increase the level of innovation. Taken studies allow to analyse the direction of innovative activities undertaken by companies of the furniture industry with particular emphasis on the ones associated in clusters. Thus the aim of the article is to investigate the interest of Polish furniture enterprises (especially SMEs), in participation in clusters. Moreover the benefits of that choice and its impact on Polish furniture manufacturers innovativeness are evaluated.
Źródło:
Management and Production Engineering Review; 2014, 5, 2; 12-19
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using collaborative management in industrial clusters – case study of Italian energy cluster
Autorzy:
Taurino, T.
Powiązania:
https://bibliotekanauki.pl/articles/407255.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
collaboration
collaborative networks
collaborative economy
network contract
energy cluster
Opis:
In the current industrial scenarios those involved in production and services distribution are called to deal with a plurality of stakeholders, considering different interests, readings and positions. This paper exploits the concept of collaboration in this fast changes and flexible scenario by describing the characteristics of collaboration among enterprises and their scope. In this context, the purpose of all managers to maximize utility, to save cost or to minimize of transaction costs is hard to be reached. Under this prospective, to collaborate with other firms is a logical way to work and to pursue the previous objectives. The purpose of this paper is to define all the aspects of collaboration, mainly among enterprises, and the reasons that can drive a manager to stipulate a collaboration agreement. Two different ways, through collaboration can rise, have been described: collaboration induced by external body (top-down collaboration) or born in a spontaneous way (bottom-up). The management of the collaboration and the identification of key performance indicators, able to control the development of the network system, is addressed by exploiting the Italian network contract and the case study of the energy cluster.
Źródło:
Management and Production Engineering Review; 2018, 9, 4; 138-149
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cluster and R&D affecting the competitive advantage of the mould and die sector in the Thai automotive industry
Autorzy:
Fongsuwan, W.
Chamsuk, W.
Tawinunt, K.
Tiengtavaj, S.
Dansomboon, S.
Takala, J.
Powiązania:
https://bibliotekanauki.pl/articles/406944.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
competitive advantage
research and development
cluster
automotive parts
mould
die
Opis:
This study concerned clusters as well as research and development affecting the competitive advantage of the Thai automotive industry’s mould and die sector. The study of development, examination of the consistency of the structural equation model, and the direct influence of linkage and association of cluster, as well as research and development for competitive advantage of operational locations in the Thai automotive mould & die sector was carried out as well. Data was collected from 320 mould and die industry operators in Thailand with the goal of obtaining key information to align the business direction in response to market opportunities. An additional goal was to elevate the competitiveness of the Thai automotive mould and die industry toward positive growth and continual sustainability.
Źródło:
Management and Production Engineering Review; 2017, 8, 4; 3-12
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cluster Based Optimization of Routing in Distributed Sensor Networks Using Bayesian Networks with Tabu Search
Autorzy:
Bhajantri, L. B.
Nalini, N.
Powiązania:
https://bibliotekanauki.pl/articles/226310.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Distributed Sensor Networks
routing
cluster head
Bayesian Network
tabu search
Opis:
Distributed Sensor Networks (DSNs) have attracted significant attention over the past few years. A growing list of many applications can employ DSNs for increased effectiveness especially in hostile and remote are as. In all application salargen umber of sensors are expected and requiring careful architecture and management of the net work. Grouping nodes in toclusters has been the most popular approach for support scalability in DSN. This paper proposes acluster based optimization of routing in DSN by employing a Bayesi an network (BN) with Tabu search (TS) approach. BN based approach is used to select efficient cluster head sand construction of BN for the proposed scheme. This approach in corporates energy level of each node, band width and link efficiency. The optimization of routing is considered as a design issue in DSN due to lack of energy consumption, delay and maximum time required for data transmission between source nodes (cluster heads) to sink node. In this work optimization of routing takes place through cluster head nodes by using TS. Simulations have been conducted to compare the performance of the proposed approach with LEACH protocol. The objective of the proposed work is to improve the performance of network in terms of energy consumption, through put, packet delivery ratio, and time efficiency of optimization of routing. The results hows that the proposed approach perform better than LEACH protocol that utilizes minimum energy, latency for cluster formation and reduce over head of the protocol.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 2; 199-208
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of environmetric & index methods as water quality comparative assessment tools focusing on heavy metal content
Autorzy:
Boyacioglu, H.
Powiązania:
https://bibliotekanauki.pl/articles/204558.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cluster analysis
factor analysis
heavy metal
pollution fingerprint
water quality index
Opis:
In the study suitability of water quality index approach and environmetric methods in fi ngerprinting heavy metal pollution as well as comparison of spatial variability of multiple contaminants in surface water were assessed in the case of The Gediz River Basin, Turkey. Water quality variables were categorized into two classes using factor and cluster analysis. Furthermore, soil contamination index was adapted to water pollution index and used to fi nd out the relative relationship between the reference standards and the current situation of heavy metal contamination in water. Results revealed that surface water heavy metal content was mainly governed by metal processing, textile and tannery industries in the region. On the other hand, metal processing industry discharges mainly degraded quality of water in Kemalpasa and Menemen. Furthermore, Kemalpasa region has been heavily affected from tannery and textile industries effl uents. Moreover, pollution parameters have not been infl uenced by changes in physical factors (discharge and temperature). This study indicated the effectiveness of water quality index approach and statistical tools in fi ngerprinting of pollution and comparative assessment of water quality. Both methods can assist decision makers to determine priorities in management practices.
Źródło:
Archives of Environmental Protection; 2012, 38, 3; 17-28
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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