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1

LINK ANALYSIS AS AN AID TO TESTING FINANCIAL CONDITION OF ENTERPRISES

100%
Lasek M., Peczkowski M.
Optimum. Studia Ekonomiczne
|
2008
|
issue 1(37)
27-42
EN
In the article Link Analysis data mining method is described and discussed. The method enables to analyse various data which are represented as network. Using Link Analysis the traffic between Internet pages showing paths in Web log data or social dependencies between people can be investigated. Although the method possesses large potential, it is not yet widespread, well known and used. The method is well implemented in the SAS Enterprise Miner program, which the authors used. The results are presented in graphical form. Various charts with some statistical measures can be used. Charts can be modified by users. Clustering and scoring is possible with the use of this method. In the article the method is illustrated with an example analyzing financial condition of enterprises.
2

DETERMINATION OF THE NUMBER OF CLUSTERS IN GROUPING PROBLEMS

100%
Lasek M., Peczkowski M.
Optimum. Studia Ekonomiczne
|
2006
|
issue 4(32)
59-80
EN
Cluster analysis methods require the users to give the number of clusters in which they would like to group objects. Determination of the actual number of clusters is not easy and proves difficult. In the paper two methods are presented that are helpful in establishing the number of clusters: (1) CCC (Cubic Clustering Criterion) method based on comparison of expected R2 value for data coming from a uniform distribution with the R2 value observed in a sample and (2) the method which is based on quality measures of building clusters in case of fuzzy grouping of data. Both advantages and drawbacks of these methods and examples of their application are presented.
3
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The object approach in the modelling of economic processes and information systems of enterprises

100%
Lasek M., Peczkowski M.
Ekonomia. Rynek, Gospodarka, Społeczeństwo
|
2003
|
issue 10
15-32
EN
The object approach was worked out within the framework of programming engineering and is widely used by information scientists for the needs of designing, programming and application of programming systems. The purpose of the article is to present the object approach as an approach which can be highly useful for economists and successfully used by them in the modelling and optimization.with respect to the costs, time, the use of resources, business processes realized in industrial, service and insurance enterprises, banks, administration. In the article the advantages of using the object approach in the modelling of business processes were stressed. Three programmes were briefly discussed, available on the Faculty of Economic Sciences: Rational Rose Enterprise Edition, ARIS and iGrafx Process, which enable the application of the object approach for the modelling and optimization of business processes..
4

Modes of Securing Information Systems

100%
Lasek M., Lasek W.
Ekonomika i Organizacja Przedsiębiorstwa
|
2006
|
issue 4(675)
43-48
EN
Mechanisms of the immune system of live organisms such as adaptation, self-organisation, memory, self-leaming abilities may become a stimulus for the development of flexible, adaptive software, similarly to biological neural networks that accelerated progress in deve!opment of artificial intelligence software. The authors present an easy to program mathematical model resembling mechanisms of immune system.
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