Optimality of the least weighted squares estimator

summary:The present paper deals with least weighted squares estimator which is a robust estimator and it generalizes classical least trimmed squares. We will prove $\sqrt{n}$-consistency and asymptotic normality for any sequence of roots of normal equation for location model. The influence function for general case is calculated. Finally optimality of this estimator is discussed and formula for most B-robust and most V-robust weights is derived

Impacts of intensive agriculture on current rural landscape - A case study for South Moravian Landscape, Czech Republic

The landscape in several countries of Central and Eastern Europe went through the most dramatic change in the socialist period. Agricultural land was considered only as a productive area. The size of arable land plots increased and stabilizing elements in the landscape were removed. This land consolidation of agriculture has led to the development of soil erosion. This paper presents a case study focused on comparison of landscape structure of model territory in two periods. The first period shows landscape before collectivization of agriculture, and the second one presents current landscape. The research dealt especially with evaluation of ecological stability and water erosion risk of the landscape. The identification of land use trends helps to characterize landscape of the model territory during monitored period. The following trends: decreasing area of arable land, increasing area of built-up areas and other areas and increase area of vineyards showed different character of current landscape. The evaluation of ecological stability confirmed the loss of stable landscape elements. Based on the calculated values of ecological stability coefficient, the evaluated landscape has degraded from the category of "disturbed landscape capable of self-regulation" to "devastated landscape". The results also show the vulnerability of current large plots of arable land and vineyards to water erosion.O

XSLT Benchmarking

Hlavním cílem této práce bylo vytvoření XSLT Benchmarku, tedy srovnání dostupných XSLT procesorů. Nejprve jsme si stanovili hlavní kritéria XSLT procesorů (cena, korektnost, rychlost, využití paměti, podpora, OS a UX), která budeme diskutovat. Poté jsme shrnuli existující XSLT procesory, popsali jednotlivé typy procesorů (program, knihovna a prohlížeč) a ohodnotili kritéria cena, podpora, OS a UX. Abychom mohli ohodnotit kritéria korektnost, rychlost a využití paměti, museli jsme si vytvořit vhodné testovací prostředí. Vytvořený program XSLT Benchmarking je jedním z hlavních přínosů této práce. Součástí programu jsou také připravené testy. Při jejich vytváření, jsme vycházeli z 5787 stažených XSLT souborů. Testy byly vytvořeny na základě analýzy těchto souborů. Zaprvé jsme zkoumali obecné vlastnosti XSLT souborů (použité elementy, použité XSLT verze, formát výstupu atd.). Zadruhé jsme zkoumali zaměření jejich použití. Dalším velkým přínosem této práce je shrnutí výsledků testů z různých pohledů. V tomto shrnutí jsme okomentovali další kritéria a vlastnosti testovaných procesorů. Na závěr jsme shrnuli možná rozšíření našeho programu i naší analýzy.The main goal of this work was to create an XSLT Benchmark, to compare available XSLT processors. At first, we determined main criteria of XSLT processors (price, correctness, speed, memory usage, support, OS and UX), which we discussed. Next, we summarized existing XSLT processors, described individual types of processors (program, library and browser) and measured criteria price, support, OS} and UX. We had to create appropriate test environment to measure criteria correctness, speed and memory usage. Created program XSLT Benchmarking is one of the main benefits of this work. The program also includes tests. We created tests based on 5787 downloaded XSLT files. Tests were created based on the analysis of these files. Firstly, we researched common features of XSLT files (used elements, used XSLT versions, output format etc.). Secondly, we researched focuses of their usages. Next big benefit of this work is a summary of results of tests from different views. We discussed other criteria and features of tested processors. Finally, we summarized possible extensions of our program and also of our analysis.Department of Software EngineeringKatedra softwarového inženýrstvíFaculty of Mathematics and PhysicsMatematicko-fyzikální fakult

Evaluation of erosion rates in cadastral area Rovečné (Moravia) using GIS tools

Evaluation of the vulnerability of agricultural land by water erosion, including the erosion control measures design, was done using the geographic information systems (GIS) on example of the cadastral area Rovečné, the Czech Republic. Analytical operations that lead to evaluation of the basic runoff and especially erosion rates according to the Universal Soil Loss Equation (USLE) were made in ArcGIS 10 Desktop, the software product ArcInfo using a set of integrated software applications ArcMap, ArcCatalog and user interface ArcToolbox, and also using programs LS-converter and USLE2D. The potential loss of soil by water erosion was determined before and after erosion control measures design. The proposed measures should improve the current situation and contribute to preservation of agricultural activity in this area in a form close to the current situation.O

XSLT Benchmarking

The main goal of this work was to create an XSLT Benchmark, to compare available XSLT processors. At first, we determined main criteria of XSLT processors (price, correctness, speed, memory usage, support, OS and UX), which we discussed. Next, we summarized existing XSLT processors, described individual types of processors (program, library and browser) and measured criteria price, support, OS} and UX. We had to create appropriate test environment to measure criteria correctness, speed and memory usage. Created program XSLT Benchmarking is one of the main benefits of this work. The program also includes tests. We created tests based on 5787 downloaded XSLT files. Tests were created based on the analysis of these files. Firstly, we researched common features of XSLT files (used elements, used XSLT versions, output format etc.). Secondly, we researched focuses of their usages. Next big benefit of this work is a summary of results of tests from different views. We discussed other criteria and features of tested processors. Finally, we summarized possible extensions of our program and also of our analysis

HyperCuts pro filtrování Linuxových paketů

Filtering of packets by multidimensional cutting is one of the new approaches to the solution of the packet classiffication problem. It is based on creating a tree that contains the set rules of filtering. In this case a packets matching is considerably faster than linear traversing of all rules. The HyperCuts methods are one of the latest methods that use multidimensional cutting. At first sight the implementation of the HyperCuts method demonstrated its utility. However, the final decision about the usage of the HyperCuts program in practice can be made only on the basis of the results of testing in it is necessary to can be using in a practice it have to be tested in practical operation. In comparison with the PTree program, which is based on the TBF method, the HyperCuts program, was more successful. The comparison was based on resolving the problem rather than on implementation aspect or success with the same data. In case, where we use PTree source code for confrontation, we compare it with source code of HyperCuts from our implementation. We compare time and memory complexity. In the theoretic part there is explain why the "range match" was used. There is definition of term "cut" which is very advantageous for time and memory complexity. One of the goals of the work was HyperCuts method..