Publications by Year: Submitted

Submitted
Syriopoulos T, Parikakis G, Merikas A. 2006 Annual Conference of European Financial Management Association. Submitted.
Maliakas M, Stergiopoulou D-D. On the action of the symmetric group on the free LAnKe. arXiv [Internet]. Submitted;(arXiv:2401.09405). Publisher's VersionAbstract
A LAnKe (also known as a Filippov algebra or a Lie algebra of the n-th kind) is a vector space equipped with a skew-symmetric n-linear form that satisfies the generalized Jacobi identity. Friedmann, Hanlon, Stanley and Wachs have shown that the symmetric group acts on the multilinear part of the free LAnKe on 2n-1 generators as an irreducible representation. They announced that the multilinear component on 3n-2 generators decomposes as a direct sum of two irreducible symmetric group representations and a proof was given recently in a subsequent paper by Friedmann, Hanlon and Wachs. In the present paper we provide a proof of the later statement. The two proofs are substantially different.
Maliakas M, Stergiopoulou D-D. On the action of the symmetric group on the free LAnKe: a question of Friedmann, Hanlon, Stanley and Wachs. arXiv [Internet]. Submitted;(2410.06979). Publisher's VersionAbstract
A LAnKe (also known as a Lie algebra of the th kind, or a Filippov algebra) is a vector space equipped with a skew-symmetric -linear form that satisfies the generalized Jacobi identity. The symmetric group  acts on the multilinear part of the free LAnKe on  generators, where  is the number of brackets, by permutation of the generators. The corresponding representation was studied by Friedmann, Hanlon, Stanley and Wachs, who asked whether for , its irreducible decomposition contains no summand whose Young diagram has at most  columns. The answer is affirmative if $k \le 3$. In this paper, we show that the answer is affirmative for all $k$
Syriopoulos T, Gavalas D. Applying the Corporate Social Responsibility to the Shipping Industry. Submitted.
Syriopoulos T. C., & Sinclair M. Τhea (1993), Αn econometric study of tourism demand: The aids model of US and european tourism in mediterranean countries. Applied economics. Submitted;25:1541-5.
Spantideas S, Giannopoulos A, Trakadas P. . IEEE Transactions on Automation Science and Engineering [Internet]. Submitted;1.
Giannopoulos A, Paralikas I, Spantideas S, Trakadas P. . IEEE Open Journal of the Communications Society [Internet]. Submitted;1.
Papadopoulos IN. Enhanced miR-182 transcription is a predictor of poor overall survival in colorectal adenocarcinoma patients. Submitted.
Syriopoulos T, Roumpis E. Evaluation of Hedge Fund Performance Relative to Traditional Capital Markets. Submitted.
Brunetti M, Sette S, Galanaki EP, De Marco L, Laghi F, Longobardi E, Coplan RJ. Exploring definitions and experiences of loneliness: Insights from interviews with children and early adolescents in Italy. Submitted.Abstract
Loneliness represents a negative feeling that arises when individuals perceive a discrepancy between actual and desired social relationships. Using a qualitative approach, the present study explored the meanings and personal experiences of loneliness in children and early adolescents in Italy. Participants included 139 children and early adolescents aged 8–14 years (M = 10.76 years, SD = 1.71; 70 girls, 57.6%) who completed an online semi-structured interview. Results from the descriptive analysis provided evidence of the multidimensional nature of loneliness, defined and experienced through different dimensions (e.g., cognitive, emotional, and regarding interpersonal context). Additionally, participants discussed loneliness in relation to both their family and peers. Some children and adolescents expressed experiencing loneliness voluntarily. Children and early adolescents reported to feel sadness, anger and other emotions as boredom, happiness, and fear in associations with loneliness. Gender and grade differences were also found. Primary school children and boys defined and experienced loneliness using the physical separation dimension. Middle school childrens defined more frequently loneliness using the cognitive dimension. Overall, the present study offers a richer understanding of the meanings and experiences of loneliness in youth and highlights the importance of considering developmental, gender, and cultural factors when studying loneliness.
Vlachogiannis E, Viorres N, Bolis S, Neofytou O. THE GREEK UNIVERSITIES INTO THE DIGITAL WORLD—THE U-PORTAL CASE STUDY. Submitted.
Savvakis G, Kenourgios D, Papageorgiou T. On Institutional Environment and Leverage of Small and Medium‐Sized Enterprises. Submitted.Abstract
We analyze the impact of the institutional environment on the leverage of European listed SMEs for the period 2005-2018. We use a broad range of institutional quality, judicial efficiency and corruption measures, along with several firm-specific and macro control variables, to identify different transmission channels on leverage. By performing a panel data analysis into the fixed effects filter estimator framework, along with several model specifications and robustness tests, the results show that better institutions, stronger judicial effectiveness and higher corruption decrease leverage. In terms of active transmission channels, increased investment under regimes of better institutional quality tends to increase leverage. Higher judicial efficiency accompanied by increased profitability tends to decrease, while higher institutional quality accompanied by higher investments tends to increase leverage, bringing more bank credit. Increasing profitability under regimes of decreased corruption decreases leverage. This last finding is even more pronounced for medium enterprises, as opposed to micro enterprises. The most significant factors associated with leverage are profitability, asset structure, cost of borrowing, stock market development and size, while an age effect is rejected. Pecking order theory seems to better fit the European SMEs capital structure choices under several institutional states.
Tsironis TG, Moustakas AL. Landscape Complexity for the Empirical Risk of Generalized Linear Models: Discrimination between Structured Data. Physical Review E [Internet]. Submitted. arXiv version
Meneghini A, Markopoulos G, Tuzzi A. Leaving no one behind? Embeddings-based topic modelling and LLMs to explore international cooperation and regional development in Greece. European Union Politics. Submitted.
Syriopoulos T, Merikas A, Roumpis E. Market Interactions and Volatility Spillover Effects Between Shipping, Oil and Stock Markets. Submitted.
F S, E A, D S. Meta-analysis of time-to-event data under model misspecification. Submitted.
Syriopoulos T, Gavalas D. Original Paper How Sticky Are the Costs? Evidence from the Shipping Industry. Submitted.
Syriopoulos T, Lekakou M, Panou C. Paper submitted to the 11 th World Conference on Transport Research June 24-28, 2007, Berkeley, California. Submitted.
M A, F S, D S.
Nonparametric meta-analysis of time-to-event data
. Submitted.
Balaouras P, Tsibanis C, Bolis S, Merakos L. ON THE PROVISION AND USE OF E-TEACHING SERVICES AT THE UNIVERSITY OF ATHENS. Submitted.Abstract
δψασδασδασδασδα
Androulidakis I, Mohsen O, Yuncken R. A pseudodifferential calculus for maximally hypoelliptic operators and the Helffer-Nourigat conjecture. [Internet]. Submitted. Publisher's VersionAbstract
Given a filtration of the module of vector fields on a smooth manifold, we define a pseudodifferential calculus where the order of a vector field is given by the filtration. We show that pseudodifferential operators have a well-defined principal symbol for a subset of the unitary representations of the osculating groups. We prove a Rockland-type theorem, showing that the invertibility of the principal symbol is equivalent to maximal hypoellipticity. This answers affirmatively a conjecture due to Helffer and Nourrigat.
Smailis D, Andreopoulou A, Georgaki A. Reflecting on the Musicality of Machine Learning based Music Generators in Real-Time Jazz Improvisation: A case study of OMax-ImproteK-Djazz. In: 2nd Conference on AI Music Creativity (AIMC 2021). Online Conference; Submitted.
Andreopoulou A, Goudarzi V. SONIFICATION FIRST: THE ROLE OF ICAD IN THE ADVANCEMENT OF SONIFICATION-RELATED RESEARCH. In: 26th International Conference on Auditory Display (ICAD 2021). Virtual Conference; Submitted.
Kazakopoulos P, Moustakas AL. Spectral Efficiency Expression for the non-linear Schroedinger channel in the low noise-limit using scattering-data. Physical Review E [Internet]. Submitted. arXiv version
Syriopoulos T, GIAVRIMIS PANAGIOTIS, TSAGKATOS EMMANOUIL, Gavalas D, SAVVAKIS MANOS, MANOLOPOULOS DIMITRIS, VAVOURAS IOANNIS, FILIPE JOSÉANTÓNIO, FERREIRA MANUELALBERTOM, COELHO MANUEL. STATISTICAL REVIEW. Submitted.
Maliakas M, Stergiopoulou D-D. Total trades, intersection matrices and Specht modules. arXiv [Internet]. Submitted;(2505.02505). Publisher's VersionAbstract
Trades are important objects in combinatorial design theory that may be realized as certain elements of kernels of inclusion matrices. Total trades were introduced recently by Ghorbani, Kamali and Khosravshahi, who showed that over a field of characteristic zero the vector space of trades decomposes into a direct sum of spaces of total trades. In this paper, we show that the vector space spanned by the permutations of a total trade is an irreducible representation of the symmetric group. As a corollary, the previous decomposition theorem is recovered. Also, a basis is obtained for the module of total trades in the spirit of Specht polynomials. More generally, in the second part of the paper we consider intersection matrices and determine the irreducible decompositions of their images. This generalizes previously known results concerning ranks of special cases.
Syriopoulos T, Theotokas I, Lekakou M, Pallis A. Tsam ourgelis I.(2006). Greek shipping industry, Employment and Competitiveness. Submitted.
Δεναξάς Νικόλαος Α. Θρησκείες και metaverse: κρίσεις και σχόλια γύρω από τις "μεταθρησκείες" στο πλαίσιο του "καπιταλισμού της επιτήρησης". In: 8ο τακτικό συνέδριο ΕΚΕ. Αθήνα: Gutenberg; Submitted.