1,721,047 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Seismic vulnerability assessment of masonry buildings
No full textThe clear majority of masonry buildings in the Eastern Mediterranean region were designed and constructed with no seismic design considerations based on the standard design practice during the 50’s-70’s. These specific buildings pose significant seismic risk mainly due to the above, and requires complicated upgrading measures to increase its seismic capacity. Therefore, it is vital for communities to adopt the appropriate assessment tools in order to quantify their vulnerability and decide on the remedy measure to ensure their sustainability from future earthquake events. The scope of this work is to compare and illustrate the results from existing assessment methods for such buildings and emphasize their advantages in order to aid the selection of the most appropriate one.Complete
Time-History Analysis
No full textThe purpose of this paper was the study of different types of nonlinear analysis and how they can be effectively used for the seismic assessment of structures. The differences between them and the differences between linear types of analysis. Moreover, from using software to analyze different structures to understand their effectiveness and compare them to linear analyzes.
For the analysis, two buildings were used. The first one is a building with four floors, and each floor has normal column and beam layout. The other building has seven floors 4which are has an irregular column and beam layout. The columns dimensions are reduced from floor to floor. There are beams supported on beams and there is inadequate wall system in the one direction, as most of the walls have their main axis in the other direction. All the above made the analysis and how the hinges are formed more interesting to examine.Complete
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Αποτίμηση Σεισμικής Επάρκειας Επταώροφης Πολυκατοικίας με την Μέθοδο Ανάλυσης Push Over και Ενίσχυση της Κατασκευής
No full textIn the present master thesis, the assessment of the seismic adequacy of an existing building made of reinforced concrete will be studied. The building under study is a seven-storey residential building, which was built in 1987 and is located in Limassol. The analysis of the building is performed with the software program SAP2000 v23.1.0 of the company Computers and Structures, Inc.
Initially, a general theoretical approach is being presented for the assessment of seismic adequacy in existing structures and then follows a detailed description of the simulation of the building in consideration, at the analysis software. In order to obtain a first behavior image of the building, certain elastic analyzes are being performed, under the action of the stress of vertical and seismic loads.
Additionally, for the calculation of the load-bearing capacity assessment of the building, it is analysed with the method of non-linear static analysis (push over), where the adequacy of its load-bearing capacity is concluded. Finally, the available coefficient of behavior (q) of the building is estimated and its adequacy is confirmed by the method of modal response spectrum analysis.
However, a small coefficient of behaviour (q) is observed, which is due to the small available plasticity of the construction and based on the data obtained from the inelastic analyses, we come to the conclusion that it is necessary to fortify the building. At the end, it is strengthened with the method of reinforced concrete jacket in vertical elements of the construction of the supporting body.Στη παρούσα μεταπτυχιακή διατριβή θα μελετηθεί η αποτίμηση της σεισμικής επάρκειας ενός υφιστάμενου κτιρίου από οπλισμένο σκυρόδεμα και η ενίσχυσή του. Το υπό μελέτη κτίριο είναι μια επταώροφή πολυκατοικία, η οποία κατασκευάστηκε το 1987 και βρίσκεται στην Λεμεσό. Η ανάλυση του κτιρίου πραγματοποιείται με το λογισμικό πρόγραμμα SAP2000 v23.1.0 της εταιρείας Computers and Structures, Inc.
Αρχικά γίνεται αναφορά στην γενική θεωρητική προσέγγιση για την αποτίμηση της σεισμικής επάρκειας σε υφιστάμενες κατασκευές και ακολουθεί η αναλυτική περιγραφή της προσομοίωσης του υπό εξεταζόμενου κτιρίου στο λογισμικό ανάλυσης. Για την απόκτηση μιας πρώτης εικόνας συμπεριφοράς του κτιρίου εκτελούνται ορισμένες ελαστικές αναλύσεις, υπό τη δράση των κατακόρυφων και σεισμικών φορτίων.
Στη συνέχεια, για τον υπολογισμό της αποτίμησης φέρουσας ικανότητας του κτιρίου,
αναλύεται ανελαστικά με τη μέθοδό της μη γραμμικής στατικής ανάλυσης (push over), όπου συμπεραίνεται η επάρκεια της φέρουσας ικανότητας του. Ακολουθεί η εκτίμηση του διαθέσιμου συντελεστή συμπεριφοράς (q) του κτιρίου και μέσω της μεθόδου της ιδιομορφικής ανάλυσης φάσματος απόκρισης, εκτιμάται η επάρκεια του.
Ωστόσο παρατηρείται μικρός συντελεστής συμπεριφοράς (q), ο οποίος οφείλεται στην μικρή διαθέσιμη πλαστιμότητα της κατασκευής και βάση των στοιχείων που προκύπτουν από τις ανελαστικές αναλύσεις, καταλήγουμε στο συμπέρασμα ότι είναι απαραίτητη η ενίσχυση του κτιρίου. Στο τέλος, ακολουθεί η ενίσχυση του με την μέθοδο κατασκευής μανδυών σε κατακόρυφα στοιχεία.Complete
Πρωτοβάθμιος αντισεισμικός έλεγχος κτηρίων
No full textThe primary seismic assessment is a crucial tool for the rapid and cost-effective evaluation of the seismic vulnerability of buildings. This thesis examines its application in Cyprus, with emphasis on the adopted methodology, evaluation criteria, and findings from existing research. It presents the current legislative framework, analyzes the condition of the existing building stock, and investigates the key factors that influence structural seismic performance.
Additionally, the thesis compares primary with secondary seismic assessments, highlighting their differences in terms of precision, required data, and technical expertise. A comparative overview of international practices is also included, showcasing policies implemented in other earthquake-prone countries such as Greece, Italy, Japan, and the United States. These countries have adopted mandatory inspection systems, especially for public and high-occupancy buildings, and have established retrofitting programs based on risk prioritization.
Finally, the thesis proposes targeted improvements for optimizing the effectiveness of primary seismic assessment in Cyprus, aiming to ensure public safety, reduce seismic vulnerability, and enhance the resilience of the built environment.Ο πρωτοβάθμιος αντισεισμικός έλεγχος αποτελεί ένα κρίσιμο εργαλείο για την ταχεία και οικονομική εκτίμηση της σεισμικής τρωτότητας των κτηρίων. Στην παρούσα μελέτη εξετάζεται η εφαρμογή του πρωτοβάθμιου ελέγχου στην Κύπρο, με έμφαση στη μεθοδολογία, τα κριτήρια αξιολόγησης και τα πορίσματα των υφιστάμενων ερευνών. Παρουσιάζεται το υφιστάμενο θεσμικό πλαίσιο και αναλύεται η κατάσταση του κτηριακού αποθέματος, καθώς και οι βασικοί παράγοντες που επηρεάζουν τη σεισμική συμπεριφορά των κατασκευών.
Επιπρόσθετα, η εργασία συγκρίνει τον πρωτοβάθμιο με τον δευτεροβάθμιο αντισεισμικό έλεγχο, αναδεικνύοντας τις διαφορές τους ως προς το βάθος αξιολόγησης, την ακρίβεια και τις τεχνικές απαιτήσεις. Στο πλαίσιο της διεθνούς σύγκρισης, παρουσιάζονται πρακτικές και πολιτικές που εφαρμόζονται σε άλλες χώρες με έντονη σεισμικότητα, όπως η Ελλάδα, η Ιταλία, η Ιαπωνία και οι Ηνωμένες Πολιτείες. Οι χώρες αυτές έχουν θεσμοθετήσει συστηματικούς μηχανισμούς ελέγχου, υποχρεωτικές επιθεωρήσεις σε δημόσια και κρίσιμης σημασίας κτήρια, και προγράμματα ενίσχυσης με βάση την εκτίμηση του σεισμικού κινδύνου.
Τέλος, προτείνονται στοχευμένες βελτιώσεις για την ενίσχυση της αποτελεσματικότητας του πρωτοβάθμιου αντισεισμικού ελέγχου στην Κύπρο, με σκοπό τη διασφάλιση της ασφάλειας των πολιτών, τη μείωση της σεισμικής τρωτότητας και την αύξηση της ανθεκτικότητας του δομημένου περιβάλλοντος.Complete
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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