Visų Lietuvoje esančių ežerų valymo darbai, sapropelio kuopimas atliekamas mechaniniu bei hidrauliniu būdais. Pastarasis sapropelio gavybos bei ežero išvalymo būdas paplitęs plačiausiai, nes gamybinės organizacijos dažniausiai naudoja technologiją, kai sapropelis pumpuojamas į specialiai tam paruoštus sėsdintuvus. Sapropelio gavyba bei ežero išvalymas atliekamas žemsiurbės pagalba. Tyrimų tikslas - parinkti geriausią žemsiurbę užpelkėjantiems ežerams valyti. Darbe pateikiama metodika, leidžianti tinkamiausią žemsiurbę išsirinkti pagal penkis kriterijus. Vertintos rusiškos, baltarusiškos, vakarietiškos taip pat anksčiau Lietuvoje naudotos žemsiurbės. Žemsiurbės vertintos daugiakriterinės analizės ELECTRE ir MAUT metodais. Daugiakriterinė analizė atlikta panaudojant programines įrangas HYPSE ir DAM. Už konsultacijas, rengiant, magistrantūros studijų baigiamąjį darbą reiškiu padėką: Doc. dr. A. Ciūniui, lekt. E. Laurinavičiui ir prof. habil. dr. L. Katkevičiui. / The cleaning works of all Lithuanian lakes, excavation of sapropel are carried out either by mechanical or hydraulic means. The latter is the common means of sapropel extraction and lake cleaning. Industrial organizations usually apply technologies so that sapropel is pumped to specially prepared sedimentation tanks. The cleaning of a lake and extraction of sapropel is carried out by the means of a dredger. The aim of the research is to choose the best dredger for the cleaning of swampy lakes. The work discusses methods which allow choosing the best dredger according to five criteria. Russian, Byelorussian, western dredgers and dredgers used in Lithuania earlier have been evaluated following the multi-criteria ELECTRE and MAUT methods. Multi-criteria analysis was carried out using HYPSE and DAM software.

Many small enterprises in Lithuania don’t use information systems in their accounting. This is because almost all of already developed accounting software is quite complex, expensive and has many additional features, witch aren’t useful for a small enterprises. This is why it has been decided to develop own specific software for a goods accounting. User interface and data structure should be adapted to the specific functions of the small optical enterprise. The purposes of the developed information system are to increase work and accounting quality, to decrease time needed for accounting, to avoid saving redundant information, to automate and simplify the process of creating analytical reports, to avoid mistakes in accounting and make accounting more efficient. In the process of developing this information system there was analyzed functional and nonfunctional, manage mental and common requirement issues. The models of dataflow, data structure, and applications were used in the requirement specification. Architecture of components and software structure is also provided in this project. The realization of this project was accomplished by means of Microsoft Access 2000. There was created database, graphical user interface, and integrated Microsoft Visual Basic for Applications was used to perform programming tasks. Abilities of this software are fully sufficient for these tasks. Selected design techniques and tools had proved themselves in solving software for small... [to full text]

The computerize information systems are widely used in the companies of Lithuania now. A lot of them are universal enough and fit to solve the various administrative problems in the companies. These systems excel in large complexity and high price. So develops the need to create more simple and cheap information systems. An aim of the project is to create system which are accomulating the information about received and given flows of the electricity energy instruments, are doing the namesake and guantity account of the accounting instruments, are formating analysis reports for the directed period. The client of the project is Rytų skirstomieji tinklai AB branch Alytus electricity network Elekctricity energy realization division. The need of the project to the client may be given an outline: · to boost the guality of work and account results; · to reduce expenditure of time to do account works; · to eliminate the information duplicate; · to ease analysis reports composing; · to escape mistakes; · to effective account work. The project is realized by MS Access data base with integrated Microsoft Visual Basic for Aplication. The posibilities of this base complete enough to accomplish those project. Also this packet helps to realize grafic users link (GUL). There are realized those functions to help users work in this project: buttons, the facilitation of the repetitive information installing, help. The project was created to satisfy the users all needs and to diminish the use... [to full text]

Magistro tezių tikslas yra sukurti skirtingų programinės įrangos tipų (gatavos arba reikalingos sukurti) įsigijimo valdymo gaires. Tokioms gairėms sukurti pirmiausia reikia apibrėžti programinės įrangos tipus. Kiekvienam apibrėžtam programinės įrangos tipui nustatyti jų įsigijimo keliai ir sudaryti kriterijai, kurie padėtų parinkti tinkamą įsigijimo kelią. Literatūros šaltinių apžvalgoje išanalizavus programinės įrangos įsigijimo modelius bei standartus nustatyti šie programinės įrangos tipai: COTS, MOTS ir naujai kuriama programinė įranga (NKPĮ). Remiantis įsigijamos programinės įrangos tipais ir projekto charakteristikomis nustatyti įsigijimo keliai. Programinės įrangos įsigijimo keliui parinkti sudaryti kriterijai, kurie apibūdina įsigyjamą programinę įrangą, įsigijimo projekto resursus ir aplinkos faktorius. Veiklos, kurios turi būti vykdomos kiekviename programinės įrangos įsigijimo kelyje, nustatytos panaudojant CMMI-ACQ procesų modelį. Procesų veiklos vykdytinos kiekviename programinės įrangos įsigijimo kelyje: nurodoma, kokiu keliu turi būti įsigyjama programinė įranga, kokias veiklas reikia vykdyti, pateikiamos rekomenduojamos pastangos, reikalingos kiekvienam PĮ įsigijimo keliui. / The primary objective of master thesis is to provide guidelines for managing a different types of software acquisition projects. Firstly, to provide guidelines is necessary to define types of software. Secondly, to create the ways of acquisition for each defined type of software and to create criteria that allows to select the right way of acquisition. During the analysis of existing software acquisition process models software types was defined: COTS (Commercial-off-the-shelf software), MOTS (Modified-off-the-shelf software), fully developed software. To have an effective acquisition processes, it is useful to employ an adequate level of formality for those processes according to the characteristics of the acquisition project. The ways of software acquisition was defined in accordance with defined software types and characteristics of acquisition projects. That can be used as a guideline on what level of formality is appropriate for the actual software acquisition project. To select the way to acquire software, there were created criteria that describes the characteristics of acquiring software, acquisition project resources and environment factors. CMMI-ACQ process model was used to define activities of each software acquisition way. Each acquisition way contains suggestions on what activities to perform for the different acquisition project customization.