Darbe nagrinėjama ryšio tinklo sinchronizacijos sistema, sudaryta iš keturių tarpusavyje sinchronizuotų generatorių. Darbo tikslas - sudaryti sinchronizacijos sistemos matematinį modelį, rasti sistemos pereinamųjų funkcijų ir generatorių virpesių fazių skirtumų tikslias analizines išraiškas, ištirti sistemos pereinamuosius procesus ir jos darbą nusistovėjusiame režime. Nagrinėjamos sistemos matematinis modelis - matricinė diferencialinė lygtis su vėluojančiu argumentu. Ši lygtis sprendžiama „žingsnių“ metodu. Tuo tikslu intervalas dalijamas į vienodo ilgio dalinius intervalus. Kiekviename daliniame intervale lygtis sprendžiama atskirai, kaip paprasta matricinė diferencialinė lygtis be vėluojančio argumento. Naudojantis gautu sprendiniu, rastos tikslios sinchronizacijos sistemos pereinamųjų funkcijų analizinės išraiškos. Remiantis šiomis išraiškomis, atliktas pereinamųjų procesų sinchronizacijos sistemoje tyrimas. / The mutual synchronization system of the communication network, composed of four oscillators, is investigated in the work. Following aims were raised in this work: to compose the mathematical model of the synchronization system, to find the exact expressions of the step responses of the system and of the phase differences of the oscillations of oscillators, to investigate the transients in the synchronization system. The mathematical model of the system is the matrix differential equation with delayed argument. This equation is solved applying the method of consequent integration (method of “steps”). For this purpose the interval is divided to subintervals of equal length. The equation in each subinterval is solved separately, as ordinary differential equation without delayed argument. Using obtained expression of the solution, the expressions of step responses of the system are got. The expressions of step responses are applied investigating the transients in the synchronization system.

Pirmoje darbo dalyje yra nagrinėjamos organizacijų ekonominės problemos ir ieškoma kaip tos problemos gali būti pašalintos. Išanalizavus kokios gali būti problemos pradėta analizuoti intelektualios verslo sistemos, kaip vienas geriausių sprendimo būdų. Darbe taip pat nagrinėjama intelektualių sistemų apibrėţimas, paaiškinama architektūra ir išskiriama kuo BIS skiriasi nuo kitų informacinių valdymo sistemų. Antroje dalyje yra nagrinėjamos pagrindinės problemos susijusios su intelektualiomis verslo sistemomis ir jų diegimu organizacijose. Analizuojama šiuo metu labiausiai paplitusios technologijos OLAP ir QlikView, kurios naudoja atmintį duomenų krovimui. Analizuojami jų privalumai ir trūkumai taip pat skirtumai. Trečioje dalyje analizuojama intelektualių verslo sistemų projektavimo metodika. Keliami klausimai ką reikia daryti, kad gautume sistemą atitinkančią organizacijos lūkesčius. Analizuojama projektavimo struktūra naudojant UML diagramas, taip pat elementų svarba pačioje sistemoje. Ketvirtoje dalyje yra projektuojami intelektualių verslo sistemų modeliai, kurie yra tik pavyzdiniai, kurie parodo kokie privalumai ir kaip veikia intelektualios verslo sistemos vykdant pirkimo funkcijas panaudojant marketinginius principus. / In the first part of master thesis analyzing the main problems, which are in organization management. The main purpose of this part is to find a solution how can resolve this problems. Business intelligence systems are the best solution. In this part analyzing business intelligence systems definition, architecture and also analyze what is different in business intelligence systems comparing with other informatics management systems. The second part of work analyzes business intelligence problems related with creation, developing and using BIS. Analyze the most popular tools like OALP and QlikView. Compare the OLAP and QlikView. Analyze QlikView like data loading from memory. Explain the advantages and disadvantages of QlikView and OLAP. The third part analyzes designing and planning of business intelligence systems. Analyze what is the main purpose to create good system which will be useful in organizations. In this part also analyze the UML modems for BIS. In the last part is presenting solutions for problems which was analyzed in the second part. The examples are created using UML diagrams.

Visuomenė, internetas ir jame esanti informacija dabar turi vieną didžiausių įtakų mūsų asmeniniame gyvenime. Be interneto daugelis dabar, net nebeįsivaizduotų savo kasdienybės, nes jis mums ir padeda atlikti daugelį darbų. Tačiau vis augant duomenų kiekiams internete, informacijos paieška tampa vienu svarbiausių internete naudojamų funkcijų.Paieškos sistemos – tai sistemos, ieškančios dokumentų žiniatinklyje, naujienų grupių archyvuose, FTP saugyklose, kuriuos rado paieškos serveris ir įtraukė į savo duomenų bazes. Ieškant informacijos, vartotojai naudojasi šiomis sistemomis, todėl internetinių svetainių kūrėjai yra suinteresuoti, kad jų internetiniai puslapiai būti kuo dažniau randami paieškos sistemų. Todėl besiplečiant paieškos sistemoms išsiplėtojo SEO (Search Engine Optimization, lietuviškai „Optimizavimas paieškos sistemoms“). / Expansion of the Internet and the information contained therein formed such an organization which aims to help the internet users to quickly and efficiently find what he needs. One of them is the Google search engine. It is one of the largest search engine companies in the world. In this paper we will analyse the Google search engine, and its proposed content optimization methods, which it claims to helps achieve better search results positions. The paper will discuss techniques such as HTML meta tags, content headers, site maps, robots.txt file, canonical and Paging functions. These methods will be compared with each other, and we will decide which method is most useful for site optimization.

The aim of the final Master degree work is to create a method, algorithms and program for cryptographic security of text files. The algorithms of cryptographic security and algorithms aspects are analyzed in the work. Construct program is used for coding / decoding text files using Pseudo – Random Number Generator and it is applied to use in Windows operating system. The program and instructions for its user are formed. The experimental adaption of method and program is done. The program synthesis of coding / decoding text files is described.

The main target of the master thesis “GIS application for marking of cycle paths” is to investigate the opportunities of cycle tourism in Lithuania, and to mark the cycle tour route and cycle route as technical design using GIS technology. The cycle route designing principles, marking possibilities In Lithuania and abroad, also cycle rout designs and cyclists flows are analyzed while estimating the opportunities of cycling tourism. Basing on the collected data and the implemented pools,, the GIS sub-system of the cycle tour rout, and its’ development technology is described. Such information would be useful for the cyclists while planning the tour rout and during the tour, however such system would be even more useful if there would be more marked and classified cycle paths. After creating the common Lithuanian cycle paths database we could gather and propose an information on the cycle tourism possibilities to the cyclists, which could benefit further development of tourism in Lithuania. The Dzukija cycle route technical design data were used during development of GIS subsystem of cycle paths. Herefore the rout were marked by hands. The developed GIS subsystem allows wider information appliance. The work consists of 76 pages, 16 tables, 43 pictures, 5 annexes, 29 sources.

The subject is relevant, as creation of open, democratic society and consideration of modern trends of the world, the formerly simple understanding of artistic education, provided by cultural and educational institutions is currently changing. Systems of cultural and educational institutions, providing services of artistic education, have an impact on cultural development. Each territorial community consists of people and groups of people, therefore, a micro-socium may be found in each of them. Territorial communities unavoidably interact with cultural and educational institutions located in their territory. This research is important both theoretically and practically, as systems of territorial cultural and educational institutions and their purpose in improvement of community culture in Lithuania have not been analysed. Solution of cultural and social problems of territorial community can be influenced by educational institutions, that provide services of artistic education, such as promoting artistic expression, artistic, creative and general abilities. Therefore, the thesis is important for institutions of artistic education, aiming for cooperation and promotion of cultural life in the regions. Problem of research: The purpose of the territorial system of cultural and educational institutions in improvement of artistic culture of the community. Object of research: territorial cultural and educational institutions and their system. Purpose of research: to reveal the... [to full text]

The purpose of the research is to create enterprise model design method and enterprise model based method of functional user requirements acquisition, analysis and specification.

Planning road maintenance and development activities, prioritizing road construction, reconstruction and rehabilitation works, performing project economic evaluations, forecasting road operation expenditures and road user effect always requires prediction of pavement behaviour. For this purpose models of pavement deterioration are used. Commonly they are integrated in more sophisticated computational systems, known as Pavement Management systems (PMS) and Highway Development and Management systems (HDM). The implementation of these systems started in Lithuania shortly after the Re-establishment of the Independence. This was triggered by the violent drop in financing of the road sector, forcing to change obsolete road management strategy and planning approach. The need for project economic evaluations, transport modelling and long term pavement performance forecasts grew up after Lithuania joined the European Union and this brought the opportunity for financing road infrastructure projects from the EU funds. At present only on the Lithuanian state road network the total value of implemented projects, justified by evaluations and modelling with PMS, amounts to about 500 million Litas annually. Any Pavement Management System is just as good as the models within it, used for pavement deterioration prediction. The performed test calculations show that prediction models, currently used for this purpose in PMS we have in Lithuania, are of doubtful accuracy and have to be improved.

DEVELOPMENT AND RESEARCH OF SPECIAL LUMINAIRE SYSTEMS Relevance of the research When Lithuania were joined into the European Community it has become necessary to use lighting devices corresponding to requirements of the European Community – ENEC norms. Taking into account the specificity of given devices in Lithuania and other new EU countries they should be steady against low temperatures, humidity, acts of vandalism, to be suitable for the illumination of industrial buildings and to fulfil the requirements of low prices of the new incorporated countries. Recently new comprehensive ENEC norms (EN European Norms, EC Electrical Certification) for luminaires were drawn up and effectively introduced by the European Union. As a result, the production of a wide range of electrical operating equipment was discontinued due to the inconsistency between technical parameters of produced equipment and new norms. Such equipments were not allowed to be marketed. Therefore it has become necessary to develop luminaires capable to fulfil the increased quality requirements of the European Union. Their development should also taken into account due to the targets of product responsibility (§ 22) laid down in the Act for Promoting Closed Substance Cycle Waste Management and Ensuring Environmentally Compatible Waste Disposal introduced in 1996 also should be taken into account extensively the aspects of ecological efficiency. In the past, plastic luminaire systems belonging to a higher... [to full text]

DEVELOPMENT AND RESEARCH OF SPECIAL LUMINAIRE SYSTEMS Relevance of the research When Lithuania were joined into the European Community it has become necessary to use lighting devices corresponding to requirements of the European Community – ENEC norms. Taking into account the specificity of given devices in Lithuania and other new EU countries they should be steady against low temperatures, humidity, acts of vandalism, to be suitable for the illumination of industrial buildings and to fulfil the requirements of low prices of the new incorporated countries. Recently new comprehensive ENEC norms (EN European Norms, EC Electrical Certification) for luminaires were drawn up and effectively introduced by the European Union. As a result, the production of a wide range of electrical operating equipment was discontinued due to the inconsistency between technical parameters of produced equipment and new norms. Such equipments were not allowed to be marketed. Therefore it has become necessary to develop luminaires capable to fulfil the increased quality requirements of the European Union. Their development should also taken into account due to the targets of product responsibility (§ 22) laid down in the Act for Promoting Closed Substance Cycle Waste Management and Ensuring Environmentally Compatible Waste Disposal introduced in 1996 also should be taken into account extensively the aspects of ecological efficiency. In the past, plastic luminaire systems belonging to a higher... [to full text]