Vilnius Tech DSpace Repository
Not a member yet
52562 research outputs found
Sort by
The Specifics of Vilnius Naujamiestis District Industrial Building Conversion Based on Example of Vilnius Drill Bits Production Factory
No full textMagistro baigiamajame darbe nagrinėjami Vilniaus Naujamiesčio gamybinės paskirties pastatų konversijos ypatumai buvusios Vilniaus grąžtų gamyklos, esančios Birželio 23-iosios gatvėje, pavyzdžiu. Šiame darbe analizuojami termino „konversija“ vartojimo atvejai, apžvelgiama Vilniaus Naujamiesčio istorija, rajono struktūra bei jos problemos, įvertinamas konversijos potencialas šioms problemoms spręsti. Nuodugniau nagrinėjama pietvakarinė Naujamiesčio dalis, kurioje pasirenkamos septynios gamybinės paskirties teritorijos ir lyginimo metodu išskiriama prioritetinė – buvusi Vilniaus grąžtų gamykla. Atliekamas pagrindinio išskirtos gamyklos gamybinio pastato istorinis tyrimas, architektūrinis, funkcinis ir konstrukcinis vertinimas, vertingųjų pastato savybių analizė, pastato fizinės būklės fiksavimas ir vertinimas. Remiantis darbo uždavinių rezultatais ir išvadomis siūlomas koncepcinis sprendimas (sklypo planas, pastato funkcinis zonavimas, pastato architektūra ir konstrukcijos) nagrinėjamo pastato konversijai atlikti. Darbą sudaro įvadas, 4 skyriai (1 teorinis analitinis ir metodologinis skyrius, 2 tiriamieji analitiniai skyriai, 1 projektinis taikomasis skyrius), išvados, literatūros sąrašas, priedai. Darbo apimtis – 83 p. teksto be priedų, 31 iliustr., 5 lent., 79 bibliografiniai šaltiniai, 1 priedas.Based on an example of Vilnius drill bit production factory, which is located on Birželio 23-iosios street, this master’s thesis investigates the specifics in conversion of industrial buildings in Vilnius Naujamiestis district. The thesis analyses the use of the term “conversion” in different cases, reviews the history of Vilnius Naujamiestis district, district’s structure and its problems, and assesses the potential of conversion in solving these problems. The thesis examines the south-west part of the Naujamiestis more thoroughly – seven industrial sites were selected there and according to the result of accomplished comparison one of the picked sites was detached – the former drill bits production factory. Few researches on the main building of the selected factory are put in this thesis: historical research, architectural, structural and functional assessments, analysis of the valuable features of the building, registration and evaluation of the physical condition of the building. Based on the results of carried out tasks and thesis conclusions, this paper proposes conceptual solutions (site plan, building functional zoning, building architecture and construction) for the conversion of the main building in the selected factory. Structure: introduction, 4 chapters (1 theoretic analytic and methodological research chapter, 2 analytic investigative research chapters, 1 project-based experimental chapter), conclusions, references, appendixes Thesis consists of: 83 p. text without appendixes, 31 pictures, 5 tables, 79 bibliographical entries, 1 appendix
An alternative approach to the safety criteria for two–lane highways
No full textBaigiamajame darbe pateikta vienos iš eismo saugumo automobilių keliuose įvertinimo metodikų – vokiečių mokslininko R. Lamo pasiūlytos eismo saugumo kriterijų ir eismo saugumo modulio metodikos – analizė ir tobulinimo galimybės. Įdėja parašyti šį darbą kilo dėl, autoriaus nuomone abejotino požiūrio – R. Lamo pasiūlyto eismo saugumo modulio tikslumas yra pakankamas. Kadangi teorinių ir eksperimentinių tyrimų rezultatai šį požiūrį paneigė, pabandyta nustatyti, kodėl modulis yra nepakankamo tikslumo. Nustatyta, kad riboto modulio tikslumo priežastis yra vadinamas parametras, dėl kurio tam tikrais atvejais gaunamos neteisingos dviejų eismo saugumo kriterijų reikšmės ir taip sutrikdomas eismo saugumo modulis. Analizuojant vingiuotumo matematinę išraišką nustatyta, kad pastaroji yra nepakankamai pagrįsta. Atliktų tyrimų rezultai nesudaro pagrindo teigti, kad eismo saugumo kriterijų ir eismo saugumo modulio metodika yra neteisinga iš esmės. Tad darbe pasiūlyta šią metodiką patobulinti dabar naudojamą vingiuotumą pakeičiant alternatyviuoju, tačiau nekeičiant modulio algoritmų. Papildomo tyrimo rezultatai parodė, kad toks požiūris yra teisingas – eismo saugumo modulio tikslumas reikšmingai padidėja, kai jame naudojamas alternatyvusis vingiuotumas. Darbą sudaro 46 psl. teksto be priedų, 22 iliustracijos, 7 lentelės, 16 literatūros šaltinių ir 3 priedai (A, B, C).The final work presents the analysis and developmental possibilities of one of the methods of assessment of traffic safety in car roads – methodology of the traffic safety criteria and traffic safety module offered by the German scientist. It was decided to write this work because, according to the author, of doubtful attitude – the accuracy of the traffic safety module, suggested by R. Lamas, is sufficient. As the results of theoretical and experimental studies denied this attitude, it was attempted to determine why the module is of insufficient accuracy. It was determined that the reason of the limited accuracy of the module is the parameter called the Curvature Change Rate of single curve because of which, in certain cases, incorrect meanings of two traffic safety criteria are received, and thus the module of traffic safety is disturbed. During the analysis of the mathematical expression of the Curvature Change Rate of single curve, it was determined that the latter one is insufficiently grounded. The results of the performed studies do not have any basis to state that the methodology of traffic safety criteria and traffic safety module is basically incorrect. Therefore the work suggests improving this methodology by changing the Curvature Change Rate of single curve with the alternative one, but not changing the algorithms of the module. The results of additional study showed that such attitude is correct – the accuracy of the traffic safety module increases significantly when it uses the alternative Direction's Change Rate of single curve Change Rate of single curve. The work is comprised of 45 pages of the text without appendixes, 22 illustrations, 7 tables, 16 literary sources and 3 appendixes (A, B, C)
Biblioteka informuoja, 2023 Nr. 30 (622)
No full textNaujai į Web of Science ir Scopus įtrauktų Vilnius Gedimino technikos darbuotojų publikacijų sąrašai ir kitos bibliotekos aktualijos.30 (622)202
Water losses reduction in Kretinga city
No full textBaigiamajame magistro darbe „Vandens nuostolių Kretingos mieste mažinimas“ apskaičiuoti fiziniai vandens nuostoliai Kretingos mieste; atliktas vandentiekio tinklų zonavimas; numatyta būtina įranga nuostolių mažinimo organizavimui; apskaičiuotos sąnaudos parengiamiesiems darbams ir nuolatiniam nuostolių paieškos grupės darbui. Tyrimo metu buvo nustatytas minimalus naktinis vieno abonento suvartojamas vandens kiekis (1 l/h/butui). Analizuotas vandens vartojamas daugiabučiuose ir pateiktos rekomendacijos įvadiniams apskaitos prietaisams. Atlikus apskaitos prietaisų palyginamuosius tyrimus nustatyta, kad Kretingos miesto daugiabučių įvaduose neapskaitomas vandens kiekis vidutiniškai yra 5,3 % nuo patiekto kiekio arba 10 l/d/butui. Atlikus skaičiavimus buvo sudarytas Kretingos miesto vandens balansas. Darbą sudaro 6 dalys: įvadas, literatūros apžvalga, tyrimų metodika, rezultatų aptarimas, išvados ir siūlymai, literatūros sąrašas. Darbo apimtis – 72 p. teksto be priedų, 48 iliustr., 13 lent., 51 bibliografinis šaltinis.In the master thesis „Water losses reduction in Kretinga city“, city‘s water loss was calculated, water zoning network was accomplished; the necessary equipment for the reduction of water loss was provided; the cost of the preparatory work was calculated and the cost of the establishment of the water loss reduction control group was estimated. During the research study the minimum nightly rate of water consumption was determined (1 l/h/apartment customer). The amount of water consumption in the city’s apartment buildings was analyzed and the recommendations for the necessary accounting devices to measured the amount of water consumption were given. The comparison of water consumption accounting devices which were used in the city of Kretinga showed, that the quantity of not calculated water was on average 5,3% of the quantities delivered per day or 10 liter/ per day for one apartment. After all the calculations were done, the water balance of the city of Kretinga was set. The structure of the thesis: scientific literature review, the methodologies use for the researches, results, conclusions and suggestions, reference
Theoretical aspects of assessing the investment attractiveness of socially responsible companies /
No full textIn the modern business environment, socially responsible business becomes a significant business management tool that allows strengthening the company's competitiveness, so more and more business companies include aspects of social responsibility in their activities. The article analyzes the ways and possibilities of assessing the investment attractiveness of socially responsible companies. The research problem is the inclusion of the social responsibility assessment of companies in the assessment of their investment attractiveness. The purpose of the study is to theoretically substantiate the peculiarities of the assessment of the investment attractiveness of socially responsible companies
Universitetų socialinė partnerystė su tarptautinio verslo subjektais : plėtros modelis
No full textThe master thesis analyses universities social partnership with international business subjects development opportunities, cooperation relevance and importance. The theoretical part presents models of universities partnership with international business subjects, an overview the relevance and importance of the topic. There is presented the concept of social partnership and entrepreneurial university also there is presented approaches of different authors to entrepreneurial university. The practical part shows the macro-environmental analysis, statistics, and analysis of secondary sources. There is also made correlation analysis and case study of different European universities. Based on the results there are determined the factors which influence the cooperation, as well according to empirical research results there is created university social partnership with international business subjects development model. Master thesis structure: introduction, the review of topic relevance and importance, the theoretical part, empirical research. At the end of the master thesis there are given conclusions and recommendations, references added. Thesis consists of: 60 p. text without annexes, 20 figures, 11 tables. Literary list includes 41 references. Annexes included.Baigiamajame magistro darbe nagrinėjamos universitetų socialinės partnerystės su tarptautinio verslo subjektais plėtros galimybės, bendradarbiavimo aktualumas ir svarba. Teorinėje dalyje pateikiami universitetų bendradarbiavimo su verslo subjektais modeliai, apžvelgiamos temos aktualijos ir svarba, pristatoma socialinės partnerystės ir verslaus universiteto samprata ir skirtingų autorių požiūris į ją. Praktinėje dalyje atliekama makroaplinkos, statistinių duomenų, ir antrinių šaltinių analizė. Taip pat atliekama koreliacinė analizė ir skirtingų Europos universitetų atvejo analizė. Remiantis gautais rezultatais nustatyti veiksniai, darantys įtaką bendradarbiavimui, taip pat pateikiamas, atsižvelgiant į gautus rezultatus, sukurtas universitetų socialinės partnerystės su tarptautiniais verslo subjektais plėtros modelis. Darbą sudaro: įvadas, temos aktualumo ir svarbos apžvalga, teorinė dalis, tiriamoji dalis. Darbo pabaigoje pateikiamos išvados ir pasiūlymai, literatūros sąrašas. Darbo apimtis – 60 p. teksto be priedų, 20 paveikslų, 11 lentelių. Literatūros sąrašą sudaro 41 literatūros šaltinis. Atskirai pridedami darbo priedai
Application of electronic waste cable sheathing as secondary use sound insulation
No full textCable is the main component of electronic equipment which leads to increasing amounts of hollow sheaths after the removal of cores: metals with insulation layers. The continuously growing dependence on technology makes it more important than ever to reuse electronic waste that outlived its primary function, conserving non-renewable resources and promoting secondary use. Tests were done on different heights of 5 cm, 7 cm, and 10 cm round structures (d = 30 mm) filled with different homogenous sheathings. The sound absorption coefficient measurements done with Kundt Tube were analysed according to length, hardness and number of strands: samples included single-stranded (soft (0.8 mm)); single-stranded (hard (0.6 mm)), double-stranded (hard (0.6 mm)); triple-stranded (soft (0.9 x 0.4 mm) sheaths. The results showed that the single-stranded hard sheathing (0.6 mm) from 1600 Hz to 5000 Hz had the highest absorption values (αs = 0.31 - 0.69), corresponding to sound absorption class C/D
Attitudes towards sustainable entrepreneurship among students: A pilot study in Latvia and Lithuania
No full textSustainable economic development is driven by sustainable entrepreneurial activities, generated by the personal attitudes of entrepreneurs. The present and future of sustainable entrepreneurship are shaped by the youth, including students, which is why it is important to understand their attitudes towards this type of entrepreneurship. Therefore, the key goal of the research is to evaluate the attitudes and behaviours of the youth towards sustainability issues and sustainable entrepreneurship. The current article reflects the results of the second research stage and aims at evaluating attitudes towards sustainable entrepreneurship among Latvian and Lithuanian students. The results reveal that gender/age affect personal environmental attitudes, however gender/age has no effect on personal willingness to start a sustainable business. The analysis results of the personal attitudes to sustainable entrepreneurship differ by age and gender. Gender has no effect and age strongly affects personal attitudes to sustainable development.iss. 1vol. 1
Research of aircraft pair plane conflict resolution
No full textBaigiamajame magistro darbe nagrinėjamas dviejų orlaivių konflikto plokštumoje sprendimas sudarant nuoseklias trajektorijas ir minimizuojant trajektorijos ilgėjimą. Išnagrinėti galimi šios problemos sprendimo metodai bei algoritmai, jų privalumai bei trūkumai. Pateiktas naujas dviejų orlaivių konflikto plokštumoje sprendimo matematinis modelis, paremtas dinaminio programavimo ir Monte Karlo paieškos metodo kombinacija, jo sudarymo teorija bei taikymo pavyzdžiai įvairioms konfliktinėms situacijoms. Baigiamajame darbe nustatyti ir prie pasirinkto greičio nagrinėjami parametrai, turintys įtakos apskaičiuojamų išvengiamųjų trajektorijų ilgiui ir skaičiavimų trukmei. Išnagrinėjus teorinį algoritmo efektyvumą, pateikiamos baigiamojo darbo išvados ir rekomendacijos tolimesniems tyrimams. Darbą sudaro 8 dalys: įvadas, orlaivių konfliktų sprendimo literatūros apžvalga, siūlomo dviejų orlaivių konflikto plokštumoje sprendimo matematinio modelio teorinė dalis, siūlomo matematinio modelio aprašymas, gautų rezultatų apibendrinimas ir rekomendacijos, išvados, literatūros sąrašas ir A priedas. Darbo apimtis – 57 p. teksto be priedų, 26 iliustr., 15 lent., 45 bibliografiniai šaltiniai. Atskirai pridedami darbo priedai.This Master thesis studies aircraft pair conflict resolution in the plane by using smoothened trajectories and minimizing the lengthening of the resolution trajectory. Various possible methods and algorithms that can be used for solving such problem are reviewed and their pros and cons are discussed. New mathematical model for solving aircraft pair conflicts in the plane based on dynamic programming and Monte Carlo tree search is proposed, its theory and examples of application to different types of conflict geometry is provided. The paper also discusses discovered parameters that, at chosen speed, have an effect on the length of resolution trajectories and running time. Given the results, conclusions are provided and recommendations for further research are proposed. The paper comprises 8 parts: introduction, aircraft conflict resolution literature review, theory of proposed mathematical model, description and explanation of proposed mathematical model, results of the research based on proposed model and recommendations for further research, conclusions, references and A appendix. Thesis consists of: 57 p. text without appendixes, 26 pictures, 15 tables, 45 bibliographical references. Appendixes included
Factors influencing fraudulent transactions from Big Data perspective
No full textThis article focuses on fraudulent behaviour and patterns as well as ways of detecting such patterns by using Big Data. The study analyses scientific articles to examine types of financial fraud and their detection techniques as well as develops a model that is based on factors characterizing fraudulent credit card transactions made across USA. Regression analysis, correlation and descriptive statistics analysis is applied. Statistically significant results are found indicating a causal relationship between fraudulent transactions and transactions made in Alaska, during the month of October and on a Thursday. Although, the impact of these relationships is relatively small. Expanding the dataset with more numerical variables that could be used for identifying fraudulent transactions is advised for future research as to better the overall fit of the model.Taip / Yes