Computer networks are used in much wider extent than 20 years ago. People use the computer mainly for communication, entertainment and data storage. Information is often stored only in electronic devices and that is why the security of the data is so important. The objective of my thesis is to describe network security problems and their solutions. First chapter deals with the network security, security checks and attacks. It describes procedures used in practise. First part deals with traffic scanning and filtering at various layers of the TCP/IP model. Second part presents the types of proxy and its pros and cons. Network Address Translation (NAT) is a favourite technique of managing IP addresses of inside and outside network which helps to improve the security and lower the costs paid for IP addresses. NAT description, IPSec, VPN and basic attacks are described in this section. The second chapter of the thesis presents set of Perl scripts for network security checking. The purpose of the project is not to check the whole network security. It is designed for contemporary needs of IBM Global Services Delivery Centrum Brno. The first script checks running applications on target object. The aim is to detect services that are not necessary to run or that are not updated. The second one checks the security of the Cisco device configuration. There is a list of rules that has to be kept. The third script inspects the Nokia firewall configuration which is on the border of IBM network. If some of the rule is broken, it shows the command that has to be proceeded at the particular device. The output of the first and the second script is an HTML file. The third script uses the command line for the final report. The last part of this chapter gives advice to configure Cisco devices. It is a list of security recommendations that can be used by configuring e.g. routers. The appendix presents two laboratory exercises. The aim is to give students an opportunity to learn something about programs and technologies which are used in practise by IT experts to check the weaknesses of their networks.

The topic of this master thesis is a comparison of the technologies for information systems creation. There are compared four fundamental technologies: Php, ASP.NET, JSP and Perl. The comparison of these technologies have two main stages: The first stage is mostly theoretical and demonstrate theoretical advantages and drawbacks of these platforms. The second stage demonstrates on some short examples advantages of platforms during information systems programming. Co-operation with database systems is compared too.

The Clemson GRB Follow-Up program utilizes the SARA 0.9-m telescope to observe optical afterglows of Gamma Ray Bursts. SARA is not yet robotic; it operates under direct and Target-of-Opportunity (ToO) interrupt modes. To facilitate rapid response and timely reporting of data analysis results, we developed a software suite that operates in two phases: first, to notify observers of a burst and assist in data collection, and second, to quickly analyze the images.

Proceeding from a specification, one develops an abstract mathematical model of a system, or portion of a system. This model of a system is validated to insure that the specification is interpreted accurately and to explore different algorithms for implementing the system behavior. We use the words "portion of a system," because only rarely are systems designed wholly using a purely top-down approach. Commonly, the design approach is a mixture of top-down and bottom-up. But even in this mixed approach, top-down techniques are critical to the development of new, advanced system features and improving the performance of existing system components. An example of this style of design tools and environments is Ptolemy II. Ptolemy II is a high-level modeling tool created at UC-Berkeley. It supports heterogeneous and homogeneous modeling, simulation, and design of concurrent systems. High-level modeling of such embedded systems as digital electronics, hardware, and software can be effectively represented. The bottom-up design approach exploits design reuse to achieve the productivity necessary to build complex systems. Historically, chip design companies have always reused designs in going from one product generation to another, but the efficiency of bottom-up design is enhanced by the use of IP (Intellectual Property) cores that a company can buy from an outside source. Design libraries are useful for system design and are an example of IP cores. A sound methodology to translate Ptolemy models to SystemC models would have a very beneficial effect on the CAD/EDA industry. Ptolemy II is written in Java and its high-level designs, or abstract graph models, are represented as XML documents. Ptolemy's major emphasis is on the methodology for defining and producing embedded software together with the system in which it is embedded. SystemC is written in C++, and its industrial use is gaining momentum due to its ability to represent functionality, communication, software, and hardware at various levels of abstraction. SystemC produces synthesizable code. A methodology to convert Ptolemy models to synthesizable SystemC code would be the technical epitome of a hybrid between top-down and bottom-up design styles and methodologies. Such a methodology would enable system designers to obtain fast design exploration, efficient IP-reuse, and validation. Ptolemy has various components and models of computation. A model of computation dictates how components interact between other components. SystemC has its own models of computation and design libraries. XML and Perl are both powerful tools by themselves, and we use these tools in this research to create a sound methodology for translating Ptolemy models (high-level of abstraction) to synthesizable SystemC code (low-level of abstraction), i.e.: code which can serve as input to hardware tools. / Ph. D.

Skriptspråk har under det senaste decenniet fått en ökad spridning, både gällande användare och gällande användningsområden. Från att huvudsakligen ha använts till enklare dagliga administratörsuppgifter används idag skriptspråken inom många områden där tidigare enbart systemspråk var ett alternativ. Denna uppsats undersöker och granskar fem skriptspråk: PHP, Perl, Ruby, Tcl och PostScript. Målet är att undersöka språkens egenskaper och se på skillnader språken emellan. Vi jämför också skriptspråken mot systemspråket C, som dock inte granskas för sig. Vi utför ett test där quicksort-algoritmen används för att sortera ett antal element som läses in från fil. Ett testskript skrivs i varje språk, och dess effektivitet och expressivitet jämförs. Vi kommer i denna uppsats fram till att definitionen för skriptspråk, och det som skiljer skriptspråk från systemspråk, är skriptspråkens avsaknad av ett separat kompileringssteg. En annan viktig aspekt är skriptspråkens användning av dynamisk typbindning för variabler. De tester vi gjort visar att inget av skriptspråken kan mäta sig med systemspråket C vad gäller exekveringstid, däremot är de bättre gällande expressivitet. Av skriptspråken är Perl det språk som är snabbast och PostScript det språk som är långsammast. / During the last decade, scripting languages have seen an increase in both number of users and areas of development. Earlier, scripting languages were mainly used for everyday system administration tasks. Nowadays, scripting languages are used in areas where previously only system languages were an alternative. In this dissertation, five scripting languages are compared and reviewed. The languages are: PHP, Perl, Ruby, Tcl, and PostScript. The goal is to examine characteristics of the languages and illustrate the differences between them. We also compare the scripting languages against the system language C, which is not examined in this dissertation. We perform a test where the quicksort algorithm is used to sort a number of elements which are read from file. A test script is written in every language, and their efficiency and expressiveness are compared. In this dissertation we come to the conclusion that the definition of scripting languages, and the main difference between scripting languages and system languages, is the absence of a separate compiling stage for scripting languages. We also consider the use of dynamic typing regarding variables to be an important aspect of scripting languages. The tests have shown that scripting languages can not compete with the system language C regarding efficiency of execution, but the scripting languages have a higher level of expressiveness. Perl is fastest among the scripting languages and PostScript is the slowest.

Die Arbeit diskutiert Lösungsvarianten und beschreibt die Implementation eines Prototyps zur Re-Organisation der Nutzerverwaltung des URZ. Besondere Schwerpunkte liegen auf der Erstellung eines Web-Interfaces zur Datenverwaltung und auf der Untersuchung relationaler Datenbanksysteme hinsichtlich der Eignung zur Lösung der Aufgabe. Der Prototyp stellt lediglich eine beispielhafte Implementierung einiger Teilkomplexe des Gesamtsystems dar.

This diploma thesis is focused on the automatization of digitization workflow in the National Library of Technology, Prague, Czech Republic. This thesis examines possibilities of digitization processes automatization by means of scripts written in Perl programming language and Apache Ant build tool. The advantages and disadvantages of both solutions are analyzed as well as their suitability for automatization of digitization workflow. Based on the comparison of both solutions, the scripts in Perl programming language are selected as the most suitable solution for automatization of digitization workflow. The question whether Ant build tool could be used for the purpose of automatization of digitization workflow is also answered in this thesis. The Ant build tool could be used for the above-mentioned purpose. However, once the activities in the given process divert from the general scope of tasks provided by the Ant build tool, the complexity of the whole solution increases rapidly. This complexity is given by the necessity to use predefined tasks -- sets of functions which have to be combined to create a functional automatization script. Even though Ant is an extendable tool, it is necessary to understand the Java programming language in order to create a new Ant task successfully. On the other hand, the Perl programming language allows easier customization of the script for the purposes of automatization of digitization workflow. Also, the modularity of the Perl programming language makes it easier to create those scripts and modify, correct or develop them even further.

Die Arbeit diskutiert Lösungsvarianten und beschreibt die Implementation eines Prototyps zur Re-Organisation der Nutzerverwaltung des URZ. Besondere Schwerpunkte liegen auf der Erstellung eines Web-Interfaces zur Datenverwaltung und auf der Untersuchung relationaler Datenbanksysteme hinsichtlich der Eignung zur Lösung der Aufgabe. Der Prototyp stellt lediglich eine beispielhafte Implementierung einiger Teilkomplexe des Gesamtsystems dar.

This study presents a topical and chronological analysis of the published works of Fritz Perls with particular attention to specified theoretical continua. The theoretical continua specified are: 1. Determinism vs. Free Will, 2. Unconscious vs. Conscious, 3. Monism vs. Dualism, A. Physical vs. Mental, 5. Nativism vs. Environmental ism, 6. Elementalism vs. Holism, 7. Reactive vs. Proactive, 8. Subjective vs. Objective, 9. Responsibility vs. Helplessness, 10. Thinking vs. Feeling, and 11. Heterostasis vs. Homeostasis. Each continuum is analyzed in reference to Perls' published thought and his stated beliefs are described and reported. Large sections of the dissertation are devoted to the intellectual, philosophical, and emotional influences that led Perls to write the theory of Gestalt therapy. The dissertation concludes with the report of Perls' position on each defined continuum, with discussion of empirical studies, Gestalt therapy and other major theories of counseling that hold parallel theoretical positions, concluding with a discussion of the limitations of the theory of Gestalt therapy and of this dissertation.

Esta dissertação investiga o processo de conversão automática de textos estruturados para hiperdocumentos. Analisa vantagens e desvantagens da utilização de um processo automático. Faz um levantamento detalhado das etapas envolvidas nesta conversão. Como resultado da pesquisa propõe um processo de conversão baseado em definições formais da estrutura dos documentos e das citações. O domínio de aplicação do processo de conversão é o conjunto de normas estatutárias jurídicas brasileiras. Outro resultado deste trabalho é a ferramenta WebifyLaw que implementa o processo de conversão automática para o conjunto das normas estatutárias jurídicas brasileiras. Os resultados da aplicação da WebifyLaw na Constituição Federal, no Código Civil e no Código de Processo Civil e em outras 42 normas são apresentados e discutidos. / This work centered in the research of the automatic conversion of structured texts into hyperdocuments. It presents an analysis concerning the advantages and disadvantages of such automatic process. It also details the steps involved in this conversion. As one of the results it proposes an automatic conversion process, which is based on document structure and citations´ formal definitions. The application domain is set as Brazilian statutory norms. Another contribution from this work is a tool called WebifyLaw, which implements the automatic conversion process for the chosen domain. The tool was applied to the Brazilian Constitution, the Civil Code among other 42 norms. The results obtained in using this application are also presented and discussed.