Conference proceedings are an important venue for publishing original research and often final research in computer science. They represent a large body of the literature in this field, and are generally considered as important, if not more, as journal articles. However, the quality or impact of conference proceedings has been controversial. This research tries to compare the impact of conference proceedings with that of journal articles, studying publications of Canadian computer scientists. Specifically, the following questions will be addressed: what is the percentage of conference proceedings in the computer science literature? What are the trends of publishing in this field? And more important, are there differences between proceedings and journal articles in terms of their structure and impact? Methods: 30 faculty members in the computer science departments, schools, or equivalent from 15 Canadian research universities were randomly selected. Scopus database was searched to identify publications by each of the 30 faculty. The structure of the two types of publications (conference proceedings and journal articles) and their impact were studied. Implications: The research findings will provide a better understanding of scholarly communication in computer science field. The results will: enable research evaluators to make informed decision when assessing the publications of computer scientists; h elp computer scientists to decide where to publish their research in order to achieve greater impact, and to select what document types to read from an increasing number of papers; help computer science librarians in collection development and in information literacy program delivery. / A presentation at C-EBLIP Fall Symposium, October 15, 2014, University of Saskatchewan.

The purpose of this dissertation is to understand how students distribute their attention while reading academic journal articles under time pressure. Given that most of the reading done in university is commonly time-sensitive and task-dependent, this dissertation explores how students actually shift their attention across the discrete sections of a journal article in the available time to identify and extract task-relevant information. Addressing gaps in the literature, the experiments in this dissertation observe the impact of the following three factors on strategic shifts in attention during study: (1) varied time conditions; (2) the presence/absence of summary information; and (3) the experience of the reader in terms of education level. The experimental methods used in this series of studies are consistent across all three chapters. Participants are given two 5-page academic journal articles to read on cognitive psychology for an impending test. Participants’ eye movement data are analyzed for the total adjusted viewing time the eyes spend in each section of the article, i.e., viewing time in each section was divided by the number of words in each section. The experiments in Chapter 2 examine overt attention when studying with and without a time constraint. Participants were given either 2 minutes of study time or unlimited study time. Analyses of the eye movement data reveal a reduced reading effect both when study time is restricted and unlimited. Specifically, the results showed that as time progresses, participants tend to read less and skim more, with the largest amount of adjusted time being spent on the Abstract. Chapter 3 examines further the apparent importance of the Abstract when reading under time constraint. It investigates whether people allocate more attention to the Abstract relative to other sections of the journal article based on its position or its summary content. Also, Chapter 3 explores whether the presence of an Abstract impacts what people read next in the article. Participants are given a limited time in which to read one of two versions of the articles to read, one version with an Abstract, the other without. The findings show that position, rather than summary content, seems to explain the amount of adjusted viewing time on the Abstract. Additionally, the summary information contained in an Abstract impacts what people read next in the article. Chapter 4 examines the extent to which participants’ education level impacts their use of a skimming strategy for studying. Here, participants form three different groups based on their year of study: graduates, senior undergraduates (3rd and 4th year), and junior undergraduates (1st and 2nd year). Overall, the results suggest that, when studying journal articles under time pressure, skimming behaviour changes from a primarily linear-skimming strategy (reading from beginning to end) to a more targeted-skimming strategy with increased education level. Finally, in the General Discussion in Chapter 5, a summary of the findings of this dissertation is considered in light of the literature on complex factors that impact attention and information-gain. The chapter also outlines hypotheses for future testing of overt attention while reading journal articles under time pressure.

The purpose of this dissertation is to understand how students distribute their attention while reading academic journal articles under time pressure. Given that most of the reading done in university is commonly time-sensitive and task-dependent, this dissertation explores how students actually shift their attention across the discrete sections of a journal article in the available time to identify and extract task-relevant information. Addressing gaps in the literature, the experiments in this dissertation observe the impact of the following three factors on strategic shifts in attention during study: (1) varied time conditions; (2) the presence/absence of summary information; and (3) the experience of the reader in terms of education level. The experimental methods used in this series of studies are consistent across all three chapters. Participants are given two 5-page academic journal articles to read on cognitive psychology for an impending test. Participants’ eye movement data are analyzed for the total adjusted viewing time the eyes spend in each section of the article, i.e., viewing time in each section was divided by the number of words in each section. The experiments in Chapter 2 examine overt attention when studying with and without a time constraint. Participants were given either 2 minutes of study time or unlimited study time. Analyses of the eye movement data reveal a reduced reading effect both when study time is restricted and unlimited. Specifically, the results showed that as time progresses, participants tend to read less and skim more, with the largest amount of adjusted time being spent on the Abstract. Chapter 3 examines further the apparent importance of the Abstract when reading under time constraint. It investigates whether people allocate more attention to the Abstract relative to other sections of the journal article based on its position or its summary content. Also, Chapter 3 explores whether the presence of an Abstract impacts what people read next in the article. Participants are given a limited time in which to read one of two versions of the articles to read, one version with an Abstract, the other without. The findings show that position, rather than summary content, seems to explain the amount of adjusted viewing time on the Abstract. Additionally, the summary information contained in an Abstract impacts what people read next in the article. Chapter 4 examines the extent to which participants’ education level impacts their use of a skimming strategy for studying. Here, participants form three different groups based on their year of study: graduates, senior undergraduates (3rd and 4th year), and junior undergraduates (1st and 2nd year). Overall, the results suggest that, when studying journal articles under time pressure, skimming behaviour changes from a primarily linear-skimming strategy (reading from beginning to end) to a more targeted-skimming strategy with increased education level. Finally, in the General Discussion in Chapter 5, a summary of the findings of this dissertation is considered in light of the literature on complex factors that impact attention and information-gain. The chapter also outlines hypotheses for future testing of overt attention while reading journal articles under time pressure.

This study explored the relationship between how students are taught to write in first-year English composition classes and what they are expected to read as part of the general education requirements at a publically-funded large university in the southeast (PLUS), and then to determine whether a gap exists. If a gap is found to exist between the preparation of students and their ability to read material that has been assigned by the teaching faculty, these students are less likely to be considered information literate by any rubric. This study uses a mixed-methods approach. Content analysis is employed to examine the assigned readings students encounter, and interviews are conducted to explore how students make sense of the academic writings assigned in general education classes. Research questions included (1) What are the overall structures of both (a) instruction composition and (b) scholarly journal articles assigned for reading in subsequent general education classes in the disciplines of psychology and history at PLUS? (2) How can these structures be identified? (3) What are the top-level structural patterns of composition within these two academic disciplines and how do they differ? and (4) Do these differences create contradictions in how students are taught to write in freshmen composition courses and the composition of the journal articles they are expected to read in their required general education classes? Thirty-one texts taken from general education syllabi were analyzed for incidence and placement of specific structural elements such as topic sentences and signal words. This study also explored perceptions of these differences from the standpoint of college students. Interviews of twenty-two students were conducted using Dervin’s Sense Making Methodology. These interviews were analyzed in terms of situations, gaps, bridges, outcomes, as well as thematic concepts that consistently arose during the interviews. Significant differences existed between readings from English Composition classes and assigned scholarly journal articles in history and psychology in incidence and placement of topic sentences, use of signal words or phrases, and readability. In addition, thematic analysis of the interviews of students found that they experienced gaps between their expectations of text composition and their experience reading assigned journal articles.

Content analysis is a systematic research method for examining symbolical content in communication by recording or transcribing these messages into categories. Reliability is one of the most distinctive attributes of content analysis methodology comparing to other techniques in communication. A content analysis was conducted by analyzing the method sections of published journal articles in Communication Abstracts from January 2006 through January 2011 by searching "advertising" and "content analysis". Results suggested that television is still the most focused medium in advertising content analysis research. Most of the content analysis studies employed 2 coders for coding reliability assessment data and final data. Moreover, content analysis researchers had improved in reporting reliability and reliability coefficients. However, there was a low percentage of studies that reported specific reliability for each variable as well as the lowest acceptable level for the reliability coefficients.

Σε αυτήν την εργασία αξιοποιούνται οι συνεισφορές από τα τέσσερα πλέον σημαντικά επιστημονικά περιοδικά Ιστορίας της Εκπαίδευσης: History of Education Quarterly, History of Education, Historica Paedagogica και Θέματα Ιστορίας Εκπαίδευσης, τα οποία εξετάζονται σε θεματολογικό και θεωρητικό επίπεδο. Στόχος της είναι: η ανίχνευση, συστηματική καταγραφή και ανάδειξη θεματολογικών και θεωρητικών τάσεων στα τέσσερα αυτά περιοδικά το διάστημα 2004-2009, η διερεύνηση της προέλευσης, ακαδημαϊκής και γεωγραφικής των αρθρογράφων τους, προκειμένου να εξαχθούν συμπεράσματα με βάση τις πρόσφατες διεθνείς επιστημονικές εξελίξεις στην Ιστορία της Εκπαίδευσης. Πρόκειται για έρευνα σε τρία αγγλόφωνα περιοδικά και ένα ελληνικό, ή με βάση την ακαδημαϊκή προέλευση των αρθρογράφων τους δύο ευρωπαϊκά, ένα αμερικάνικό και ένα ελληνικό. Βασική σε αυτήν την εργασία είναι η αντίληψη ότι τα επιστημονικά περιοδικά αποτελούν σημαντικούς φορείς εκφοράς επιστημονικής γνώσης σε ειδικούς τομείς εκπαίδευσης. Παρουσιάζονται οι θεματικές και θεωρητικές τάσεις των τεσσάρων περιοδικών και συγκρίνονται οι σχέσεις ομοιότητας και διαφοράς που προκύπτουν. Η θεωρητική κατάταξη στηρίζεται στην αναζήτηση και τον εντοπισμό των κοινωνικών θεωριών στην εκπαίδευση και ειδικότερα στην ανίχνευση των συγκρουσιακών και φιλελεύθερων κοινωνικών θεωριών των άρθρων, χωρίς αυτό να σημαίνει ότι δεν υπάρχουν και άλλες σημαντικές θεωρίες που δε συμπεριλαμβάνονται σε αυτά τα πλαίσια. Η ανάλυση δείχνει ότι τα ευρωπαϊκά περιοδικά συγκλίνουν ως προς τη θεματικής τους κατάταξη, ενώ το αμερικανικό διαφοροποιείται. Αναφορικά όμως με τη θεωρητική τους κατάταξη παρατηρείται αξιοσημείωτη ομοιογένεια. Τα αποτελέσματα συζητούνται λαμβάνοντας υπόψιν τις σχέσεις τους με τα ευρύτερα κοινωνικο-πολιτικά, οικονομικά, πολιτισμικά και εκπαιδευτικά δεδομένα, σε εθνικό και διεθνές επίπεδο. Βασική θεωρείται η αντίληψη ότι οι συστατικές συνθήκες των διανοητικών σχηματισμών αλλάζουν μαζί με τις κοινωνικές συνθήκες. Η μελέτη αυτή επικεντρώνεται στην πενταετία 2004-2009, διότι το διάστημα αυτό σημειώθηκαν ραγδαίες εξελίξεις σε όλους τους τομείς της ζωής. Η ερμηνεία των εκπαιδευτικών εξελίξεων, ειδικά των τελευταίων χρόνων και στην Ελλάδα και στο εξωτερικό, είναι αποτέλεσμα πρωτίστως των τεράστιων αλλαγών που έχουν συντελεστεί έξω από το χώρο του σχολείου: μεταβιομηχανική, μετανεωτερική κοινωνία παγκοσμιοποίηση, κοσμοπολιτισμός, πλανητική αλληλεξάρτηση, διαπολιτισμική επικοινωνία, εποχή του διεθνισμού κυριαρχία της οικονομίας της ελεύθερης αγοράς, οικονομία της γνώσης και των παγκόσμιων πόλεων μονοκρατορία μιας υπερδύναμης, κοινωνία της γνώσης ή των πληροφοριών, εποχής πληροφορίας, επιστημονική διεθνοποίηση, εισαγωγή της έννοιας του δικτύου, είναι ορισμένες από τις βασικές έννοιες που εξετάζονται. Οι συνθήκες αυτές διαμόρφωσαν και την παγκόσμια ιστορία. Από τα τέλη του 20ου αι. σημειώθηκε το τέλος των μεγάλων αφηγήσεων και των καθολικών θεωριών, που υποκίνησε την εμφάνιση των μαύρων, Λατίνων, ομοφυλοφίλων, γυναικών, αντρών, μετα-αποικιακές, μετα-κοσμικές, μετα-εθνικές, οπτικές, υλικές και άλλες ιστορίες. Τα σύγχρονα δεδομένα επιβάλλουν τη διαμόρφωση σφαιρικής ιστορικής συνείδησης, οι ιστορικοί, επιζητούν να καταστήσουν τον κόσμο ως σημείο αναφοράς. Και η εκπαίδευση προσπαθεί να συμβαδίσει με τις σύγχρονες ανάγκες των καιρών, όπως προκύπτουν από την κοινωνία της γνώσης και της πληροφορίας που ξεπρόβαλλε από την τεχνολογική επανάσταση. Μέσα σε αυτό το πλαίσιο, οι θεματικές και θεωρητικές τάσεις των τεσσάρων περιοδικών παρουσιάζονται, οι βασικοί θεωρητικοί και θεματικοί τους άξονες περιγράφονται και οι ιδιαίτερες σχέσεις τους με την κοινωνική πραγματικότητα αξιολογούνται. Τα συμπεράσματα που προκύπτον είναι ενδεικτικά της στενής σχέσης που υπάρχει μεταξύ εκπαίδευσης και κοινωνίας και λειτουργούν ενθαρρυντικά για περαιτέρω έρευνα, και προτρεπτικά για μεγαλύτερη συμμετοχή των Ελλήνων κυρίως επιστημόνων στο διεθνή επιστημονικό χώρο Iστορίας της Εκπαίδευσης. / In this study the contributions of the most important scientific journals in the History of Education, are valuated in a thematological and theoritical level. Its aim is: the detection, systematic recording and appointment of thematological and theoritical tendencies og this four magazines during the period 2004-2009, the investigation of the origin, academic and geografic of the writters, in order to conduct conclusions due to the recent international scientific developments ih the History of Education. It involves research into three anglophone magazines and one greek or due to ths academic origin of its writters, two europpean, one american and one greek. Basic to this work is the view that scintific magazines constitute significant institutions of scientific knowledge of srecific aducational sectors.The thematological and theoritical tedencies of ths four journals are presented and the relations of difference and resemblance are compared. The theoretical classification is supported in the search and the localisation of social theories in the education and more specifically in the detection the conflict and liberal social theories of the articles, without meaning the absence of other important theories that are not included in these frames.The analysis shows that the European magazines converge as for their thematic classification, while American is differentiated. Relatively however with their theoretical classification is observed remarkable homogeneity.The results are discussed taking in mind their relations with the wider sociopolitical, economically, cultural and educational data, in national and international level. Basic is considered the perception that the constitutive conditions of mental shapings change with the social conditions. This study is focused in the period 2004-2009, because during this interval rapid developments in all the sectors of life were taken place. The interpretation of educational developments, specifically the last years and in Greece and in the abroad, is result of mainly enormous changes that has taken place outside from the space of school: industrial society globalisation, cosmopolitanism, planitjki' interdependence, cross-cultural communication, season of internationalism sovereignty of economy of free market, economy of knowledge and world cities autocracy of superpower, society of knowledge or information, season of information, scientific internationalisation, import of significance of network, are certain from the basic significances that are examined.This conditions shaped also the world history. The 20th century was marked by the end of big narrations and catholic theories, that instigated the appearance of blacks, Latins, homosexuals, women, men, colonial, secular, national, optical, material and other histories. The modern data impose the configuration of overall historical conscience, the historians, seek to render the world as point of report. Education as well tries to keeps pace with the modern needs of times, as they result from the society of knowledge and information that emerged from the technological revolution. In this frame, the thematic and theoretical tendencies of four journals are presented, their main theoretical and thematic axes are described, their particular relations with the social reality are also evaluated. The conclusions that emegre are indicatively of narrow relation that exists between education and society and function encouraging for further research, and bigger attendance of Greek mainly scientists in the international scientific space of History of Education.

Made available in DSpace on 2015-04-16T15:23:20Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 845821 bytes, checksum: bbe531a6a57c7cb4307ba63b56bf2eab (MD5) Previous issue date: 2012-04-02 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / The present research aimed to evaluate the Indexing Policy of Journal Articles of the Central Library of Federal University of Paraíba. In order to have a better understanding between theory and practice, the phases of the indexing process were identified as well as the observation concerning indexing policy accomplished by indexers. Taking into account the comparison of the indexing policy guidelines with the subject catalogue, we could detect inconsistencies regarding the construction of the controlled vocabulary. Finally, we verified auxiliary instruments used in the indexing process of journal articles. In this way, it was used the qualitative / quantitative method through the analysis of the subject descriptors referred to the controlled vocabulary built and available in the manual catalogue format for the users´ consultation. A total of, approximately, 27 thousand descriptors were registered from which a sample of 1.350 of them was taken for re-evaluation in the indexing policy. It was used the technique of individual verbal protocol with indexers and both undergraduate and graduate students of the Federal University of Paraíba. Bardin´s content analysis method about verbalizations was used. We categorized some users´ speeches so that we could analyze their content related to the services offered by the Journal Sector. The obtained results were satisfactory considering the current problems. We realized that the phases of the indexing process through documental reading are fulfilled according to Lancaster s theory as well as other authors´. Descriptors of subjects, in their majority, are in accordance with the standards expected by indexing policy. The inconsistency problem is invariable in an indexing service and it is in permanent search for solutions. The representation instruments of information which aid the indexing service still need to be defined so as to encompass all knowledge areas of the archive of the mentioned journal sector. This research is of great relevance, though there is very little scientific literature about indexing policy of journal articles in information systems in Brazil, specifically in university libraries. / A presente pesquisa objetivou avaliar a Política de Indexação de Artigos de Periódicos da Biblioteca Central da Universidade Federal da Paraíba. Para uma melhor compreensão entre a teoria e a prática, buscou-se identificar as etapas do processo de indexação como também observar a utilização da política de indexação pelos indexadores. A partir da comparação das diretrizes da política de indexação com o catálogo de assunto pode-se detectar as inconsistências ocorridas na construção do vocabulário controlado. Por fim, verificaram-se os instrumentos auxiliares utilizados no processo de indexação de artigos de periódicos. Desse modo, foi utilizado o método qualitativo/quantitativo através da análise de descritores de assunto do vocabulário controlado construído e disponível no formato de catálogo manual para consulta dos usuários. Foram contabilizados aproximadamente 27 mil descritores dos quais foi retirada uma amostragem de 1.350 para reavaliação diante da política de indexação. Aplicou-se a técnica do protocolo verbal individual com os indexadores e estudantes de graduação e pós-graduação da Universidade Federal da Paraíba. Utilizou-se o método de análise de conteúdo, de Bardin, sobre as verbalizações. Categorizaram-se algumas falas dos usuários para que se pudesse analisar o seu conteúdo relacionado com os serviços oferecidos pela Seção de Periódicos. Os resultados obtidos foram satisfatórios diante dos problemas enfrentados. Constatou-se que as etapas do processo de indexação através da leitura documentária são feitas de acordo com a teoria vigente em Lancaster e outros autores. Os descritores de assuntos, em sua grande maioria, estão dentro dos padrões desejados pela política de indexação. O problema de inconsistência é uma constante num serviço de indexação e em permanente busca de soluções. E os instrumentos de representação da informação que auxiliam o serviço de indexação necessitam ainda serem definidos de forma que contemple todas as áreas do conhecimento do acervo da seção de periódicos em questão. Esta pesquisa possui grande relevância, ainda que haja escassa literatura científica sobre política de indexação de artigos de periódicos em sistemas de informação no Brasil, especificamente em bibliotecas universitárias.

Submitted by Morgana Silva (morgana_linhares@yahoo.com.br) on 2016-12-05T13:35:19Z No. of bitstreams: 1 arquivototal.pdf: 845823 bytes, checksum: f32ffdac6c4ead88c64b88e070441d64 (MD5) / Made available in DSpace on 2016-12-05T13:35:19Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 845823 bytes, checksum: f32ffdac6c4ead88c64b88e070441d64 (MD5) Previous issue date: 2012-04-02 / The present research aimed to evaluate the Indexing Policy of Journal Articles of the Central Library of Federal University of Paraíba. In order to have a better understanding between theory and practice, the phases of the indexing process were identified as well as the observation concerning indexing policy accomplished by indexers. Taking into account the comparison of the indexing policy guidelines with the subject catalogue, we could detect inconsistencies regarding the construction of the controlled vocabulary. Finally, we verified auxiliary instruments used in the indexing process of journal articles. In this way, it was used the qualitative / quantitative method through the analysis of the subject descriptors referred to the controlled vocabulary built and available in the manual catalogue format for the users´ consultation. A total of, approximately, 27 thousand descriptors were registered from which a sample of 1.350 of them was taken for re-evaluation in the indexing policy. It was used the technique of individual verbal protocol with indexers and both undergraduate and graduate students of the Federal University of Paraíba. Bardin´s content analysis method about verbalizations was used. We categorized some users´ speeches so that we could analyze their content related to the services offered by the Journal Sector. The obtained results were satisfactory considering the current problems. We realized that the phases of the indexing process through documental reading are fulfilled according to Lancaster’s theory as well as other authors´. Descriptors of subjects, in their majority, are in accordance with the standards expected by indexing policy. The inconsistency problem is invariable in an indexing service and it is in permanent search for solutions. The representation instruments of information which aid the indexing service still need to be defined so as to encompass all knowledge areas of the archive of the mentioned journal sector. This research is of great relevance, though there is very little scientific literature about indexing policy of journal articles in information systems in Brazil, specifically in university libraries. / A presente pesquisa objetivou avaliar a Política de Indexação de Artigos de Periódicos da Biblioteca Central da Universidade Federal da Paraíba. Para uma melhor compreensão entre a teoria e a prática, buscou-se identificar as etapas do processo de indexação como também observar a utilização da política de indexação pelos indexadores. A partir da comparação das diretrizes da política de indexação com o catálogo de assunto pode-se detectar as inconsistências ocorridas na construção do vocabulário controlado. Por fim, verificaram-se os instrumentos auxiliares utilizados no processo de indexação de artigos de periódicos. Desse modo, foi utilizado o método qualitativo/quantitativo através da análise de descritores de assunto do vocabulário controlado construído e disponível no formato de catálogo manual para consulta dos usuários. Foram contabilizados aproximadamente 27 mil descritores dos quais foi retirada uma amostragem de 1.350 para reavaliação diante da política de indexação. Aplicou-se a técnica do protocolo verbal individual com os indexadores e estudantes de graduação e pós-graduação da Universidade Federal da Paraíba. Utilizou-se o método de análise de conteúdo, de Bardin, sobre as verbalizações. Categorizaram-se algumas falas dos usuários para que se pudesse analisar o seu conteúdo relacionado com os serviços oferecidos pela Seção de Periódicos. Os resultados obtidos foram satisfatórios diante dos problemas enfrentados. Constatou-se que as etapas do processo de indexação através da leitura documentária são feitas de acordo com a teoria vigente em Lancaster e outros autores. Os descritores de assuntos, em sua grande maioria, estão dentro dos padrões desejados pela política de indexação. O problema de inconsistência é uma constante num serviço de indexação e em permanente busca de soluções. E os instrumentos de representação da informação que auxiliam o serviço de indexação necessitam ainda serem definidos de forma que contemple todas as áreas do conhecimento do acervo da seção de periódicos em questão. Esta pesquisa possui grande relevância, ainda que haja escassa literatura científica sobre política de indexação de artigos de periódicos em sistemas de informação no Brasil, especificamente em bibliotecas universitárias.

(in English): The aim of presented master thesis is to suggest the optimization of articles processing in the Digital Library of the Academy of Sciences of the Czech Republic. The present state of journal articles processing is described and the weaknesses are evaluated. The journal articles processing optimization is suggested in two steps. The first step is to choose only one integrated library system for journal articles processing. The second step is using the system of shared cataloging and the proper use of three external resources. The main contribution of this thesis is the deep evaluation of the external journal articles records resources and the process of shared cataloging. Fifteen journals were proposed to the process of shared cataloging and record downloading but only five of them are suitable for this process.

Trotz großer Dokumentmengen für datenbankübergreifende Literaturrecherchen erwarten akademische Nutzer einen möglichst hohen Anteil an relevanten und qualitativen Dokumenten in den Trefferergebnissen. Insbesondere die Reihenfolge und Struktur der gelisteten Ergebnisse (Ranking) spielt, neben dem direkten Volltextzugriff auf die Dokumente, inzwischen eine entscheidende Rolle beim Design von Suchsystemen. Nutzer erwarten weiterhin flexible Informationssysteme, die es unter anderem zulassen, Einfluss auf das Ranking der Dokumente zu nehmen bzw. alternative Rankingverfahren zu verwenden. In dieser Arbeit werden zwei Mehrwertverfahren für Suchsysteme vorgestellt, die die typischen Probleme bei der Recherche nach wissenschaftlicher Literatur behandeln und damit die Recherchesituation messbar verbessern können. Die beiden Mehrwertdienste semantische Heterogenitätsbehandlung am Beispiel Crosskonkordanzen und Re-Ranking auf Basis von Bradfordizing, die in unterschiedlichen Phasen der Suche zum Einsatz kommen, werden hier ausführlich beschrieben und im empirischen Teil der Arbeit bzgl. der Effektivität für typische fachbezogene Recherchen evaluiert. Vorrangiges Ziel der Promotion ist es, zu untersuchen, ob das hier vorgestellte alternative Re-Rankingverfahren Bradfordizing im Anwendungsbereich bibliographischer Datenbanken zum einen operabel ist und zum anderen voraussichtlich gewinnbringend in Informationssystemen eingesetzt und dem Nutzer angeboten werden kann. Für die Tests wurden Fragestellungen und Daten aus zwei Evaluationsprojekten (CLEF und KoMoHe) verwendet. Die intellektuell bewerteten Dokumente stammen aus insgesamt sieben wissenschaftlichen Fachdatenbanken der Fächer Sozialwissenschaften, Politikwissenschaft, Wirtschaftswissenschaften, Psychologie und Medizin. Die Evaluation der Crosskonkordanzen (insgesamt 82 Fragestellungen) zeigt, dass sich die Retrievalergebnisse signifikant für alle Crosskonkordanzen verbessern; es zeigt sich zudem, dass interdisziplinäre Crosskonkordanzen den stärksten (positiven) Effekt auf die Suchergebnisse haben. Die Evaluation des Re-Ranking nach Bradfordizing (insgesamt 164 Fragestellungen) zeigt, dass die Dokumente der Kernzone (Kernzeitschriften) für die meisten Testreihen eine signifikant höhere Precision als Dokumente der Zone 2 und Zone 3 (Peripheriezeitschriften) ergeben. Sowohl für Zeitschriften als auch für Monographien kann dieser Relevanzvorteil nach Bradfordizing auf einer sehr breiten Basis von Themen und Fragestellungen an zwei unabhängigen Dokumentkorpora empirisch nachgewiesen werden. / In spite of huge document sets for cross-database literature searches, academic users expect a high ratio of relevant and qualitative documents in result sets. It is particularly the order and structure of the listed results (ranking) that play an important role when designing search systems alongside the direct full text access for documents. Users also expect flexible information systems which allow influencing the ranking of documents and application of alternative ranking techniques. This thesis proposes two value-added approaches for search systems which treat typical problems in searching scientific literature and seek to improve the retrieval situation on a measurable level. The two value-added services, semantic treatment of heterogeneity (the example of cross-concordances) and re-ranking on Bradfordizing, which are applied in different search phases, are described in detail and their effectiveness in typical subject-specific searches is evaluated in the empirical part of the thesis. The preeminent goal of the thesis is to study if the proposed, alternative re-ranking approach Bradfordizing is operable in the domain of bibliographic databases, and if the approach is profitable, i.e. serves as a value added, for users in information systems. We used topics and data from two evaluation projects (CLEF and KoMoHe) for the tests. The intellectually assessed documents come from seven academic abstracting and indexing databases representing social science, political science, economics, psychology and medicine. The evaluation of the cross-concordances (82 topics altogether) shows that the retrieval results improve significantly for all cross-concordances, indicating that interdisciplinary cross-concordances have the strongest (positive) effect on the search results. The evaluation of Bradfordizing re-ranking (164 topics altogether) shows that core zone (core journals) documents display significantly higher precision than was seen for documents in zone 2 and zone 3 (periphery journals) for most test series. This post-Bradfordizing relevance advantage can be demonstrated empirically across a very broad basis of topics and two independent document corpora as well for journals and monographs.