The aim of this work is to analyze the modern radio communication technologies and to formulate a methodology and means for implementing them in customers’ premises networks.

Elektronikos gamybos rinkoje produkcijos kokybei užtikrinti buvo pasikliaujama žmogaus vizualia apžiūra ir elektroniniais testais. Pasirodžius personaliniams kompiuteriams, gamybos pramonėje pradėta naudoti „kompiuterinė rega”. Procesas, kuriame naudojamas optinis vaizdo sensorius, pvz.: kamera, apibūdinamas kaip automatinė optinė kontrolė – AOK (angl. Automated Optical Inspection - AOI). Darbo tikslas - sukurti spausdintinio montažo plokščių kokybės įvertinimo sistemą panaudojant kompiuterinę regą, išrinkti spausdintinio montažo plokščių kokybės įvertinimui efektyviausius vaizdo apdorojimo algoritmus ir jų parametrus bei įvertinti jų efektyvumą. Taip pat nagrinėjama aplinkos veiksnių (apšvietimo, naudojamos techninės įrangos ir kt.) įtaka sistemos darbo efektyvumui. / Historically the electronics manufacturing market has relied on a combination of human visual inspection and electrical test methods to ensure product quality. With the advent of the personal computer, the use of "machine vision" in industrial applications gradually became more common. Process where optical sensors (i.e., cameras) are used to make specific pass/fail decisions is usually described as Automated Optical Inspection or AOI. There are discussed problems of designing AOI system in this paper. Main goal is to select most efficient image analysis algorithm and to study other parameters that have impact for designing reliable AOI system.

Disertacijoje nagrinėjami GSM kanale vykstantys balso paketų praradimai. Nagrinėjama galimybė vertinti trumpų balso segmentų kokybę PESQ algoritmu. Pasiūlomas naujas, mažos trukmės balso signalų kokybės vertinimo PESQ algoritmu metodas. Pristatomas originalus balso kokybės vertinimo metodas mobiliojo ryšio sistemoms, paremtas balso kokybės klasėmis. / Thesis presents the research of voice frame losses in the GSM. The possibility of evaluation of quality of short duration signals using PESQ algorithm is analysed. New method for preparation of short duration signals for PESQ measurements is proposed. Original method based on quality classes for voice quality evaluation in mobile communications is presented.

Thesis presents the research of voice frame losses in the GSM. The possibility of evaluation of quality of short duration signals using PESQ algorithm is analysed. New method for preparation of short duration signals for PESQ measurements is proposed. Original method based on quality classes for voice quality evaluation in mobile communications is presented. / Disertacijoje nagrinėjami GSM kanale vykstantys balso paketų praradimai. Nagrinėjama galimybė vertinti trumpų balso segmentų kokybę PESQ algoritmu. Pasiūlomas naujas, mažos trukmės balso signalų kokybės vertinimo PESQ algoritmu metodas. Pristatomas originalus balso kokybės vertinimo metodas mobiliojo ryšio sistemoms, paremtas balso kokybės klasėmis.

The aim of this work is to analyze the modern radio communication technologies and to formulate a methodology and means for implementing them in customers’ premises networks.

Ocular torsion determination using search coils was a preferred method in a past few years. But advantages of the digital image processing techniques allows us to refuse search coils and use video-based techniques instead. The manufactures of the commercial video-based systems declare high accuracy of their product, but they don’t publish result analysis in public to improve it. We chose to use E. Greon’s (1997) suggested method with additional pattern matching using cross correlation. The landmarks of iris texture is used to track from frame to frame, so its important to enhance them. The researches helped to find out what is the most suitable iris processing and what are the optimal correlation parameters. The results showed, that a polar cross correlation can be applicable for ocular torsion measurement.

There were adapted the stream commands (SSE2) for videooculography measuring methods of eyes movements in this activity (an analysis by straight lines and an analysis by a circle). By their assistance the time of detection methods of eye pupil centre coordinates was accelerated. The algorithm of eye pupil centre detection was presented in which there were used the methods of analysis by straight lines and analysis by circles. There were presented stream commands (SSE2) and the methods of their use. After investigetion it was determined that the time of eye pupil centre coordinates by assistance of stream commands has been accelerated.

Energetikos inžinerijos magistro darbo tema yra aktuali kraštui integruojantis į vakarus ir tokios pastangos atitinka Europos Sąjungos (ES) direktyvų reikalavimus didinti energetikos efektyvumą jos vartojimo sferoje, Lietuvos energijos taupymo įstatymą, miesto savivaldybės nuostatas taupyti lėšas ir kiek įmanoma mažiau didinti nuotekų šalinimo paslaugos kainą. Elektros energijos vartojimo efektyvumo tyrimo tikslas – nustatyti energijos taupymo galimybes nuotekų valymo įrenginiuose. Darbe apžvelgiamas visas nuotekų valymo technologinis procesas. Atlikta elektros energijos vartojimo analizė. Išmatuotos agregatų techninės charakteristikos bei paskaičiuotos jų technologinės normos. Pateikti pasiūlymai elektrinio šildymo normavimui pritaikant dienolaipsnių metodą. Orapūčių darbo efektyvumui didinti pasiūlyta jų reguliavimą vykdyti pagal ištirpusio deguonies kiekį. / This master thesis of Energetic Engineering refers to the problems relevant to the Lithuanian Republic integration westwards and its efforts to meet the requirements of European Union directives of increasing the effectiveness of energetics in the sphere of its consumption as well as Lithuanian Law on Energy and to follow the regulations of municipalities regarding economizing financial means, making efforts to reduce the price growth of the sewage treatment service. The aim of the research of the electricity consumption effectiveness is to define the ways of energy saving in the sewage disposal devices. During this research the whole technological process of sewage disposal has been examined and the analysis of electricity consumption has been done. The technical characteristics of the units have been measured and their technological standards have been estimated as well. The suggestions for standard-setting of electrical heating applying the daydegree method have been made in the research. It has been proposed to increase the effectiveness of air blower operating through regulating the quantity of melted oxygen. / Тема исследования актуалъна стране интегрируяс в западную Европу. Задача исследования эфективности потребляемой электроэнергии - установитъ возможности економии электроэнергии в водоочистителъных сооружениях.

Baigiamajame magistro darbe atliekamas sklandytuvo atakos ir slydimo kampo matavimo metodų tyrimas. Pirmoje darbo dalyje apžvelgiami atakos kampo matuokliai: virvutė, pritvirtinta ant stiklinio gaubto, atakos – slydimo kampo matuoklis su vėjarodžiu ir Pitoto vamzdelio tipo daviklis. Davikliai palyginami, aprašomi jų privalumai ir trūkumai lyginant su kitais davikliais. Antroje dalyje aprašomi alfa ir beta kampų matavimo metodai: matavimas vamzdelio tipo davikliu ir metodas, kai nenaudojami specialūs atakos, slydimo kampo davikliai. Toliau apžvelgiami veiksniai, turintys įtakos matavimo tikslumui. Pateikiamos kelių vamzdelio tipo daviklių kalibravimo kreivės. Paskutinėje dalyje programa Matlab kuriamas matematinis-dinaminis sklandytuvo modelis. Modeliu, pagal nustatytas sąlygas, skaičiuojami atakos ir slydimo kampai, analizuojami grafikai. / The thesis made the glider’s attack and slip angle measurement methods for the investigation. The first part gives an overview of measuring devices of angle of attack and slip angle: The side string, attached to the side of the canopy, vane mounted AOA sensor, Pitot-tube type sensor. The sensors are compared, describes their advantages and disadvantages compared with other sensors. The second part describes the alpha and beta angle measurement methods: measurement with the tube-type sensor, and the method without using the specific attack, slip angle sensors. The following gives an overview of factors affecting the measurement accuracy. Several tube-type sensor calibration curves are presented. The last part of thesis presents development of mathematical – dynamic model of the glider using Matlab software. The model calculates the angle of attack and slip using set conditions of flight.

Kogeneracija – techniškai pažangus šilumos ir elektros energijos gamybos būdas. Elektros energija gaunama iš generatoriaus, o šilumos energija gaunama variklio aušinimo metu. Kadangi Lietuvoje elektros ir šilumos gamyba iš atsinaujinančių energijos šaltinių yra labai aktualu, darbo tikslas: suprojektuoti kogeneracinės jėainės vidaus elektros tinklą, parinkti kogeneratorių. / Cogeneration technologically advanced of heat and electricity production. It is particularly relevant for Lithuania, because there exists a strong need for heat production, the restructuring of heat and electricity networks, is changing its legal framework, the development of market relations. Undergraduate work is designed combined heat and power plant. Cogeneration plant will be used for alternative fuel: biogas which derived from the landfill. However, in order to improve the efficiency of cogeneration landfill gas is mixed with natural gas in certain proportion. Combined heat and power plant is designed according to the Republic of Lithuania laws and regulations. Heat comes from cogeneration emissions into the atmosphere in summer. It was found that in order to increase the heat recovery efficiency, not only in winter but in summer, for example to be equipped with heated vegetable production complexes.