41 research outputs found
Studying the Readability of Scientific Papers
No full textPresentation of the TPDL 2019 paper "A study on the readability of scientific texts".
We perform a longitudinal study about the readability of scientific texts on a large, multidisciplinary dataset. Furthermore, we measure the agreement of traditional readability metrics with expert judgements. Finally, we investigate the association of publication abstract readability with scientific impact.
Full author list for the paper: Thanasis Vergoulis, Ilias Kanellos, Anargiros Tzerefos, Serafeim Chatzopoulos, Theodore Dalamagas, Spiros Skiadopoulo
BIP! Finder: Facilitating Scientific Literature Search by Exploiting Impact-Based Ranking
No full textPresentation of the CIKM 2019 demo paper "BIP! Finder: Facilitating Scientific Literature Search by Exploiting Impact-Based Ranking".
Due to the rapidly increasing number of scientific articles, finding valuable work for further research has become tedious and time consuming. To alleviate this issue, search engines have used citation-based article impact ranking. However, most engines rely on very simplistic impact measures (usually the citation count) and make the problematic assumption that there is a one-size-fits-all impact measure. To address these problems, we present BIP! Finder, a search engine that facilitates the identification of valuable articles by exploiting two different impact measures, each capturing a different aspect of the article impact. In addition, BIP! Finder provides many useful features (article comparison, intuitive visualisations, article bookmarking mechanism, etc.) making it a powerful addition to the researcher’s toolbox.
Full author list for the paper: Thanasis Vergoulis, Serafeim Chatzopoulos, Ilias Kanellos, Panagiotis Deligiannis, Christos Tryfonopoulos, Theodore Dalamagas</p
Concentration in Knowledge Output: A case of Economics Journals
No full textThis paper assesses the degree of author concentration in seven economics journals, which were published in India during 1990-2002. To measure the degree of author concentration, Lotka's Law was used. Moreover, we also make an exploratory analysis of the geographic, economics subfield and institutional concentration in 704 economics journals. An important finding of this paper is that specialized journals in the sample report the highest degree of author concentration. This result is quite similar to the findings by Cox and Chung (1991). Furthermore, there are several instances showing that the journals lean towards certain norms; this may affect the flow of innovative ideas into economics. We conclude that a knowledge activity, involving the high degree of concentration and a biased publication process, may affect the flow of new ideas into the discipline.Concentration, Lotka's Law
SciTo Trends: Visualising Scientific Topic Trends
No full textMonitoring trends in scientific disciplines is a common task for researchers and other professionals in the broad research and academic community, like research and innovation policy makers and research fund managers. We demonstrate SciTo, a powerful tool that assists in the monitoring of trends in scientific disciplines. SciTo supports keyword-based search for the identification of scientific topics of interest and comparison of interesting topics to each other in terms of their popularity inside the academic community.
Full author list: Serafeim Chatzopoulos, Panagiotis Deligiannis, Thanasis Vergoulis, Ilias Kanellos, Christos Tryfonopoulos, Theodore Dalamaga
Cold Wars after 1989: Thanasis Valtinos\u27 Orthokosta and its Reception
No full text This paper examines the reception of Thanasis Valtinos\u27 novel Orthokosta (1994). Since its first appearance, Orthokosta has enjoyed a less than favorable reception, predominantly from leftist commentators who have mounted what seems to be a systematic campaign to discredit the novel\u27s apparent claims to historical truth. The work has been credited with prompting a turn towards "revisionism" in the historiography of the Greek Civil War. Indeed its author has been labeled as a "former leftist” who turned “reactionary" after the demise of “Real Socialism” in 1989. These comments on the text and its author have been accompanied by aesthetic evaluations of the novel which question its status as literature. This paper argues that Orthokosta challenged the basis for the construction of Party-based leftist identities in post-dictatorship Greece and criticized implicitly the populist ideology of the 70s and 80s in Greece. Leftist historians and intellectuals relied on this ideological climate to construct both their political identities and their version of Civil-War historiography. As a work of fiction, Orthokosta questions the institutionalized discourse that sanctified the Left in such historiography and challenges the literary aesthetics that its makers implicitly espoused in constructing it. This paper examines the reception of Thanasis Valtinos\u27 novel Orthokosta (1994). Since its first appearance, Orthokosta has enjoyed a less than favorable reception, predominantly from leftist commentators who have mounted what seems to be a systematic campaign to discredit the novel\u27s apparent claims to historical truth. The work has been credited with prompting a turn towards "revisionism" in the historiography of the Greek Civil War. Indeed its author has been labeled as a "former leftist” who turned “reactionary" after the demise of “Real Socialism” in 1989. These comments on the text and its author have been accompanied by aesthetic evaluations of the novel which question its status as literature. This paper argues that Orthokosta challenged the basis for the construction of Party-based leftist identities in post-dictatorship Greece and criticized implicitly the populist ideology of the 70s and 80s in Greece. Leftist historians and intellectuals relied on this ideological climate to construct both their political identities and their version of Civil-War historiography. As a work of fiction, Orthokosta questions the institutionalized discourse that sanctified the Left in such historiography and challenges the literary aesthetics that its makers implicitly espoused in constructing it. Cet article examine l\u27accueil reçu par le roman Orthokosta de Thanasis Valtinos (1994). Depuis sa première apparition, Orthokosta a bénéficié d\u27un accueil peu favorable, principalement de la part de critiques de gauche, qui ont monté ce qui semble être une campagne systématique visant à discréditer les pretentions apparentes du roman à la vérité historique. L\u27oeuvre a été créditée d\u27une volonté de «révisionnisme» de l\u27historiographie de la Guerre civile grecque. En effet, son auteur a été étiqueté comme un "ex-gauchiste» qui devient «réactionnaire» après la chute du «socialisme réel" en 1989. Ces observations sur le texte et son auteur ont été accompagnées par des évaluations esthétiques du roman qui remettent en question sa valeur littéraire. Cet article soutient que Orthokosta a contesté la construction des identités de gauche basée sur le Parti pendant la période de l\u27aprèsdictature en Grèce et a critiqué implicitement l\u27idéologie populiste des années 70 et 80 en Grèce. Des historiens et des intellectuels de gauche se sont appuyés sur ce climat idéologique pour construire à la fois leurs identités politiques et leur version de l\u27historiographie de la Guerre civile. Comme une oeuvre de fiction, Orthokosta pose des questions sur le discours institutionnel, qu\u27a sacralisé la Gauche dans une telle historiographie et défie l\u27esthétique littéraire que ses créateurs ont implicitement adoptée dans sa construction
Concentration in Knowledge Output:A Case of Economics Journals
No full textJournals moderate knowledge activity in economics. The activity of publishing article in professional journal forms significant part of knowledge output. Output of economics articles has been growing over the time. We examine an important question: Is there any case of institutional or location concentration in knowledge production? This paper analyses concentration indicators specific to economics journals and explores link between publication process and concentration. The analysis of various concentration measures present evidence for institutional-geographic-area-author concentration in Knowledge production in Economics. High concentration levels indicate possibility of institutional lock-in. The literature provides evidence for myopic refereeing, editorial favouritism and the presence of ‘lock-in’ effect. The achievement in journal publication is influenced by factors like institutional affiliation, propitious circumstances etc. Discussion carried out in this paper hints the possibility of causal link between unfair process and unfair outcome.Knowledge,Lotka's Law,Fourier Series
Island identities?: Comparing the perceptions of islanders towards governing institutions and quality of life
No full textIn this paper, we seek to shed light on issues related to satisfaction with government institutions and personal quality of life from living on an island, teasing out common themes to determine whether there is a shared identity among islanders, regardless of geography, level of development and size, as it relates to governance. We explore these qualities in six different groups of island residents across ten islands or archipelagos, ranging in size, location and governance features. Half are sovereign states and the rest are subnational island jurisdictions: Tobago (Trinidad & Tobago), Grenada, Prince Edward Island (Canada), St. Lucia, Lesvos (Greece), Cyprus, Newfoundland (Canada), Iceland, Reunion (France) and Mauritius. Using a Likert-type questionnaire, island participants were asked about the factors that constitute “quality of life” on their islands, with a particular focus on governance. The construction of composite indicators from survey questions and cluster analysis allows us to compare the attitudes within and between different groups of islands and stakeholder groups. Results suggest that, despite significant contextual variances among stakeholders and island locations and situations, some common threads run through all groups and all islands, related to the group the respondents were classified in. These threads comprise a rough basis for a deeper understanding of island identities
General Reinforcement Learning Agents for Crop Management
No full textAgriculture plays a vital role in the global economy, providing the necessary food and resources for human survival. With the world’s population projected to surge, the demand for food is set to escalate in the coming decades. This increasing demand, coupled with the challenges posed by climate change and the detrimental effects of pollution due to fertiliz-ers, underscores the urgency for more efficient and sustainable crop management strategies. Effective crop management is a complex and time-consuming task that involves various fac-tors, including climate conditions and soil quality. Traditional crop management strategies often rely on expert knowledge to guide the decision-making process, which may be sub-optimal and prone to error. Reinforcement learning (RL) has gained significant attention in recent years as a promising approach for decision-making and control in agriculture, aiding in the management process. RL environments such as CyclesGym [51], accommodate the design of agents that oper-ate within an agricultural system, often surpassing the performance of traditional strategies. However, the optimal policy may vary heavily depending on the specific field location, due to its specific weather conditions and soil quality. In this thesis, we aim to investigate the use of RL for managing fields in multiple locations with the aim of reducing training time and data and increasing robustness compared to independent training. To this end, we plan to use multi-task learning methods and optimizers to reduce total training time, to improve RL agents’ adaptability to changing environments, and to reduce data usage required for maximum performance across multiple agricultural fields.Computer Scienc
Feasibility Study for PV Park in TU Delft Campus Zuid
No full textTU Delft, being in the frontier of research and progress in Europe and worldwide, is always interestedin exploring the possibilities of renewable energy production. In that respect, the Facility ManagementDepartment (FMD) of the university approached the Photovoltaic Materials and Devices (PVMD) group,whose research covers a wide area in the renewable energy sector, in order for the solar potential of anextensive available area in the South of the TU Delft Campus to be investigated. This thesis project aimsat shining a light on the latter, while also proposing a best business case scenario for realization.In order to deal with the issue at hand, a complete MATLAB-based modelling tool has been developedfor the simulation and evaluation of PV module and PV system performance. Additionally, a locationsurvey was conducted, which resulted in the recreation of the skyline profile and the study of the reflectivityof the ground. In case of using a bifacial PV module, the PVMD Toolbox can be integrated in theapproach.Using the developed modelling approach, different PV technologies were investigated. The bifacialmono-Si PV modules by LG were found to outperform the competition on yield and cost criteria. Theresults indicated that the best performance is achieved for a tilt of 40o and an azimuth of 165o. A sensitivityanalysis was also carried out, based on which a ground clearance height of 1.5 [m] was selected.Furthermore, the results extracted using the modelling tool were cross-validated using the PVMD Toolboxand the System Advisor Model (SAM), showing a satisfactory performance with the maximum deviationsbeing 1.5% and 3%, respectively.Moreover, two different potential loads were studied in conjunction with the solar modules. The firstwas the 1.25 [GWh] annual demand of the EXACT building, closely located to the investigated area. Inthis case a grid-connected PV system was designed with the total amount of modules being calculatedas 2,520. The second was an electrolyzer of a nominal capacity of 1.25 [MW], scheduled to be installedat the Process and Energy (P&E) Department of the university. The electrolyzer was assumed to supplyhydrogen to two fuel cell buses, and its respective PV system was designed both as grid-independent aswell as grid-connected. In the independent approach the total number of required PV modules was foundto be 4,000, while in the grid-connected approach the size of the PV system was chosen similar to theone designed for the EXACT building. Moreover, two hydrogen production strategies, a minimum anda maximum, were investigated. The respective produced hydrogen was found to be 9,100 and 20,619[kg].The choice of the best business case was based on a performance and cost analysis that was conducted.The conclusion drawn from this analysis was that decentralized PV systems have a better performance dueto higher inverter efficiency and lower cable losses, while the centralized approach has a better behaviourcost-wise due to the initial investment being smaller by 2%. Additionally, systems with a higher lifetimeyield better results. All in all, the grid-connected, decentralized, electrolyzer-coupled PV system with themaximum hydrogen production strategy was deemed as the best business case. The initial investment of1.28 [M €] is won back over a period of 5.1 [yr], having an LCoE of 8.2 [cts €/kWh]. The area requiredto fit the PV system is comprised of Zones B1, B2 and B3, which show the greatest potential.Electrical Engineering | Sustainable Energy Technolog
SciTo Trends: Visualising Scientific Topic Trends
No full text<p>Presentation of the TPDL 2019 demo paper "SciTo Trends: Visualising Scientific Topic Trends".</p>
<p><a href="https://scito.imsi.athenarc.gr">SciTo Trends</a> is a platform that facilitates exploration of scientific topic trends and provides intuitive infographics to showcase the topics' popularity trends. </p>
<p>Full author list: Serafeim Chatzopoulos, Panagiotis Deligiannis, Thanasis Vergoulis, Ilias Kanellos, Christos Tryfonopoulos, Theodore Dalamagas</p>
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