Šio darbo tikslas buvo sukurti reikalavimais grindžiamą duomenų saugumo ir matomumo metodų pasirinkimo bei jų kombinavimo metodinę medžiagą. Pateikti reikalavimas grindžiamą kompleksinės saugos modelį. Pašalinti kompleksinės apsaugos metodų informacijos trūkumą. Darbe išnagrinėti ir palyginti garsių pasaulio saugos specialistų kompleksinės saugos sprendimai. Atlikta sistemos pažeidimų analizė ir sisteminimas. Darbe buvo siekiama atskleisti svarbiausius pažeidimus, jų veikimo principus ir kaip nuo jų tinkamai apsisaugoti. Praktinėje dalyje aprašytas kompleksinis saugos modelis, kuris vėliau smulkinamas į detalius apsaugos modelius. Modelis buvo pritaikytas šiandien populiariausiose kombinuotoje sistemose Microsoft Windows Server 2008 serveryje ir Microsoft SQL Server 2008 duomenų bazių valdymo sistemoje. Naudojantis metodika galima atlikti esamos sistemos saugumo analizę ir remiantis veiklos modeliais teisingai konfigūruoti esamą ar naujai kuriamą sistemą. / This work destination was to create requirements based on data security and availability method choosing and their combination methodology. Introduce requirements based on complex security model. Eliminate information lack of complex security. In work analyzed and compared complex security solutions of famous the word security specialists. Accomplished system vulnerability analysis and systematized information. During the work revealed most important vulnerabilities, explain how it works and how correctly secure of them. In this research described security model of complex security, which later detailed as smaller part of model. Complex security model were used at nowadays most popular combined information system. For research were used Microsoft Windows Server 2008 and Microsoft SQL Server 2008. Created methodology is useful then necessary to test existing or creating new configuration of system.

Analysis of already created heat metering and billing systems are made. Lacks and advantages of existing systems are overlooked and considered for add-on model development. Heat metering and billing functions are described and solution is presented. MS Navision and MS SQL Server technologies usability aspects where analyzed. The functionality of MS Navision where compared with described heat metering and billing functions and the fit-gap where made. Product was built as a specific add-on module for MS Navision Attain. The most important goals of product where heat energy billing integration with financial management and flexible data model for program adaptation to methodology changes of heat energy billing. Data model flexibility analysis where done and compatibility to requirements was established. MS Navision and MS SQL server functions performance testes where run and recommendations for choosing platform are made.

Šiuo metu informacija yra sukaupta paskirstytuose šaltiniuose, kurie kaip saugojimo priemonę naudoja duomenų bazes. Šios bazės yra skirtingų tipų. Vartotojo tikslas yra naudoti keletą nepriklausomų informacijos šaltinių kaip vieną. Dėl savo nepriklausomumo nuo DBVS ir platformos tipo, XML tapo ypatingai naudingas atviroms susisiekiančioms sistemoms, kuomet duomenys apsikeičiami tarp paskirstytų duomenų šaltinių. Šiame darbe pateikiamas ontologijų, kaip dalykinės srities apibrėžimo informacijos paieškai, panaudojimas. Tai leidžia optimizuoti reikiamos informacijos paieškos procesą ir išvengti užklausos rezultatų pertekliškumo. / The main problem in heterogeneous database integration is data incompatibility in different databases. XML is perfect solution in data exchange between different databases as it is independent from OS, applications or hardware. To implement XML in data exchange XML must be created corresponding to the databases. This work propose use of ontologies for information retrieving from heterogenous data bases. Such method let optimize user query to avoid wasted information.

Problems, relating to the imposition of direct taxes on e-commerce, calculation and collection thereof in e-commerce are discussed in the final Master's thesis with reference to the laws of the Republic of Lithuania, by comparing them with the model of the double taxation avoidance agreement of the Organization for Economic Co-operation and Development as well as the remarks of the experts of this Organization. Criteria, according to which the e-commerce taxation jurisdiction is applicable, are given herein. Collection of direct taxes of e-commerce in performance of e-commerce activities via server as well as permanent registered office is analyzed.