New doctoral dissertation

May 14, 2026

VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Economic impact of Baltic region startups ecosystems“ prepared at VILNIUS TECH by Daina Kleponė. The dissertation was prepared in 2021–2026. Scientific consultant – Prof. Dr Laima Okunevičiūtė Neverauskienė.

The dissertation was defended at the public meeting of the Dissertation Defence Council of the Scientific Field of Economics in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 2 p.m. on 13 May 2026.

Since the 1990s, a distinct innovation-driven and high-growth activity, organised around venture-capital-financed startups and their surrounding ecosystems, has diffused globally. Despite strong policy and investor attention, the field still lacks a consistent, operational definition of a “startup,” and empirical evidence on startups’ net economic contribution remains fragmented. Consequently, policy ambition for startup-tailored instruments has advanced faster than empirical clarity, complicating the design, targeting, and evaluation of ecosystem interventions. This dissertation develops and empirically substantiates an integrated conceptual model for assessing the enabling environment and macroeconomic impact of startup ecosystems. The research proceeds in two stages. First, it constructs a structured theoretical framework for defining startups and refines the definition using empirically validated characteristics. Second, it operationalises ecosystem inputs, firm-level outputs, and macro-level outcomes in an empirically testable framework grounded in entrepreneurial ecosystem theory, endogenous growth theory, and Schumpeterian creative destruction. The empirical core focuses on the Baltic startup ecosystems (Lithuania, Latvia, and Estonia) using extensive firm-level accounting data (2014–2024) for startups and comparable non-startups within the same industries, complemented by ecosystem and macro indicators from international organisations. Methods include comparative performance analysis, panel econometrics for growth and productivity determinants (including total factor productivity estimation), and machine-learning techniques (principal component analysis and k-means) for indicator reduction, ecosystem typologies, and composite index construction. A key contribution is the construction of a startup ecosystem maturity proxy (V index) based on venture capital activity metrics and the estimation of its association with selected macroeconomic indicators via regression models. The dissertation provides an empirically grounded basis for startup identification, cross-country ecosystem assessment, and a more rigorous evaluation of whether and how startup ecosystem development translates into measurable economy-wide outcomes.

Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.

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New doctoral dissertation
New doctoral dissertation
VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Development and Property Studies of Structures with Acoustic Metamaterial Made from Recycled Plastic“ („Konstrukcijų su akustine metamedžiaga iš perdirbto plastiko kūrimas ir savybių tyrimai“) prepared at VILNIUS TECH by Andrej Naimušin. The dissertation was prepared in 2021–2026. Scientific consultant – Assoc. Prof. Dr Tomas Januševičius. The dissertation was defended at the public meeting of the Dissertation Defence Council of the Scientific Field of Environmental Engineering in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 9 a.m. on 15 May 2026. The dissertation examines plastic constructions and an acoustic metamaterial that is based on the Helmholtz resonator’s operating principle. The main object of the research is a structure made of a metamaterial from recyclable plastic, which has good sound insulation and sound absorption properties. The dissertation aims to create a structure made of metamaterial from recycled plastic to improve sound insulation for indoor partitions and room sound absorption. The following tasks are solved in the work: the first task concerns the development of metamaterials and the study of their non-acoustic and acoustic properties; the second task is related to theoretical calculations for individual metamaterial resonators using the transfer matrix method; the third and fourth tasks characterise acoustic properties using an interferometer and a sound transmission chamber, and the design of sound-absorbing panels made of recycled plastic metamaterial and sound-insulating systems with recycled plastic metamaterial; and the fifth task is the prediction of the sound insulation and sound absorption of the final engineering solution using modelling programmes. The dissertation consists of an introduction, three chapters, general conclusions, a list of used literature, and a list of the author’s publications on the topic of the dissertation. The introductory chapter describes the research problem and the work’s relevance, describes the object of the research, formulates the aim and tasks of the work, indicates the research methodologies, the scientific novelty of the work and the practical significance of the work results, and presents defended statements. The introduction closes by listing the author’s publications and conference presentations on the dissertation topic and by providing the dissertation’s structure. The First Chapter examines the possibilities of recycling plastic waste to improve indoor acoustics and analyses scientific research on sound insulation and sound absorption. The Second Chapter presents methodologies for sample calculation and preparation, determination of acoustic and non-acoustic properties, and modelling of sound insulation and absorption. The Third Chapter presents the results of theoretical, sound insulation, sound absorption, and static air resistance research and their analysis. Five scientific articles have been published on the dissertation topic: three in scientific journals included in the Web of Science database; one in the Scopus-referenced conference proceedings; and one in a conference proceedings publication referenced in other international databases. Five presentations on the dissertation topic were given at conferences in Lithuania and abroad. Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.
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