Different clustering techniques : means for improved knowledge discovery

Application of different clustering techniques can result in different basic data set partitions emphasizing diversified aspects of resulting clusters. Since analysts have a great responsibility for the successful interpretation of the results obtained through some of the available tools, and for giving meaning to what forms a qualitative set of clusters, additional information attained from different tools is of a great use to them. In this article we presented the clustering results of small and medium sized enterprises’ (SMEs) data, obtained in DataEngine, iData Analyzer and Weka tools for intelligent analysis

EWMA Based Threshold Algorithm for Intrusion Detection

Intrusion detection is used to monitor and capture intrusions into computer and network systems which attempt to compromise their security. Many intrusions manifest in dramatic changes in the intensity of events occuring in computer networks. Because of the ability of exponentially weighted moving average control charts to monitor the rate of occurrences of events based on their intensity, this technique is appropriate for implementation in threshold based algorithms

Park on a lake by Hubert Robert in the National Museum in Belgrade

Slika Park na jezeru, delo francuskog slikara Ibera Robera (1733- 1808), čuva se u Zbirci strane umetnosti Narodnog muzeja u Beogradu, u fondu francuske umetnosti, od jula 1949, kada je, zajedno sa grupom umetničkih dela dopremljenih iz Nemačke, primljena na ime ratnih restitucija. Ona je, kao i celokupna Roberova umetnost, suma raznorodnih fenomena francuske vizuelne kulture XVIII veka. Utemeljena je u senzibilnoj kulturi prve polovine veka prosvetiteljskim stavovima o prirodi i estetici pitoresknog. Oni su objedinjeno, podstakli razvoj popularnih vizuelnih formi - vedute di fantasia, čiji je Rober bio dominantni francuski predstavnik. Na slici Park na jezeru predstavljen je imaginarni domen u kojem su se prožela Roberova sećanja na vrtove italijanskih renesansnih vila i njegovo iskustvo dizajnera vrtova francuske elite. Kontakti sa teoretičarima hortikulture čije je vrtove oblikovao doprineli su da Rober bude cenjen kao 'najprirodniji' kreator slika i vrtnih 'slika'. Pitoreskni šarm Parka na jezeru, podstaknut integracijom prirode i zdanja iz prošlih epoha, sugestivne i poetične forme koje pobuđuju senzitivni kapacitet posmatrača i pozivaju ga da 'dovrši' sliku svojim interpretacijama i da 'prošeta' po njoj, potvrđuju Roberovu slavnu reputaciju.The painting Park on a Lake, a work of the French painter Hubert Robert (1733-1808) has been preserved in the collection of foreign art of the National Museum in Belgrade, in the fund of French art since July 1949, when it arrived from Germany with a group of other works of art and was accepted as war restitution. Like entire Robert's art, the painting is a sum of different phenomena of French visual culture of the 18th century. It is founded on the sensitive culture of the first half of the century, as well as on the enlightenment attitudes on the nature and esthetics of the picturesque. United, they inspired the development of popular visual forms vedute di fantasia, with Robert as a dominant French representative. The painting Park on a Lake represents an imaginary domain where Robert's memories of the gardens of Italian renaissance villas intertwined with his experience of garden design of the French elite. Contacts with horticultural theoreticians whose gardens he shaped contributed to the fact that Robert was appreciated as the 'most natural' creator of paintings and garden 'paintings'. The picturesque charm of Park on a Lake was motivated by the integration of nature and buildings from the past, suggestive and poetic forms that inspire the sensitive capacity of the observer and invite him to 'finish' the painting with his interpretations and to 'walk' through it thus confirming Robert's glorious reputation

EWMA Algorithm in Network Practice

Intrusion detection is used to monitor and capture intrusions into computer and network systems which attempt to compromise their security. Many intrusions manifest in changes in the intensity of events occuring in computer networks. Because of the ability of exponentially weighted moving average (EWMA) control charts to monitor the rate of occurrences of events based on their intensity, this technique is appropriate for implementation in control limits based algorithms. The paper also gives a review of a possible optimization method. The validation check of results will be performed on authentic network samples

First evidence of the presence of Multixenobiotic Resistance Mechanism activity in freshwater invasive species, signal crayfish Pacifastacus leniusculus (Dana, 1852)

Background and Purpose: The signal crayfish Pacifastacus leniusculus (Dana, 1852) is one of the most successful invasive species of crayfish in European freshwaters, an extremely diverse though endangered group of ecosystems. The main goal of this study was to functionally characterize multixenobiotic resistance (MXR) mechanism defense activity in P. leniusculus tissues for the first time. MXR mechanism protects the cell from a wide variety of toxic compounds, and it is mediated by the transport activity of ATP-binding cassette (ABC) proteins. Materials and Methods: MXR transporter activity dye assay was performed by using fluorescent model substrate rhodamine B (RB) in combination with inhibitors of MXR efflux pumps: MK571 and Verapamil, known to inhibit multidrug resistance-associated proteins (MRP) and P-glycoprotein (P-gp), respectively. In this assay, the increase in intracellular fluorescence of the substrate dye, indicates inhibition of MXR efflux protein pumps. The assay was performed in three different tissues (gills, hepatopancreas, tail muscle). Additionally, tissues were exposed to selected heavy metals – mercury (HgCl2) and zinc (ZnCl2), known to occur in open freshwaters as pollutants. Results: Optimal time for RB accumulation in gills and hepatopancreas was determined to be 30 minutes. RB efflux in gills was inhibited by MK571 and in hepatopancreas by Verapamil, suggesting that multidrug resistanceassociated proteins are dominant in gills of P. leniusculus, and P-glycoprotein in hepatopancreas. Finally, inhibitory effect of mercury (HgCl2: 10 and 20 μM) and zinc (ZnCl2: 5–20 μM) on multixenobiotic resistance mechanism activity in gills, and only mercury in hepatopancreas, was detected. Conclusions: The results for the first time demonstrate the presence of multixenobiotic resistance mechanism efflux activity as an important tissue specific defense mechanism in P. leniusculus and provide the basis for future molecular and toxicological studies of this invasive and adaptable species