-
Chen, C.: CiteSpace II : detecting and visualizing emerging trends and transient patterns in scientific literature (2006)
0.04
0.036598433 = product of:
0.073196866 = sum of:
0.073196866 = sum of:
0.04234059 = weight(_text_:c in 5272) [ClassicSimilarity], result of:
0.04234059 = score(doc=5272,freq=4.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.2694848 = fieldWeight in 5272, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.0390625 = fieldNorm(doc=5272)
0.030856274 = weight(_text_:22 in 5272) [ClassicSimilarity], result of:
0.030856274 = score(doc=5272,freq=2.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.19345059 = fieldWeight in 5272, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0390625 = fieldNorm(doc=5272)
0.5 = coord(1/2)
- Abstract
- This article describes the latest development of a generic approach to detecting and visualizing emerging trends and transient patterns in scientific literature. The work makes substantial theoretical and methodological contributions to progressive knowledge domain visualization. A specialty is conceptualized and visualized as a time-variant duality between two fundamental concepts in information science: research fronts and intellectual bases. A research front is defined as an emergent and transient grouping of concepts and underlying research issues. The intellectual base of a research front is its citation and co-citation footprint in scientific literature - an evolving network of scientific publications cited by research-front concepts. Kleinberg's (2002) burst-detection algorithm is adapted to identify emergent research-front concepts. Freeman's (1979) betweenness centrality metric is used to highlight potential pivotal points of paradigm shift over time. Two complementary visualization views are designed and implemented: cluster views and time-zone views. The contributions of the approach are that (a) the nature of an intellectual base is algorithmically and temporally identified by emergent research-front terms, (b) the value of a co-citation cluster is explicitly interpreted in terms of research-front concepts, and (c) visually prominent and algorithmically detected pivotal points substantially reduce the complexity of a visualized network. The modeling and visualization process is implemented in CiteSpace II, a Java application, and applied to the analysis of two research fields: mass extinction (1981-2004) and terrorism (1990-2003). Prominent trends and pivotal points in visualized networks were verified in collaboration with domain experts, who are the authors of pivotal-point articles. Practical implications of the work are discussed. A number of challenges and opportunities for future studies are identified.
- Date
- 22. 7.2006 16:11:05
-
Nicolaisen, J.: Citation analysis (2007)
0.02
0.02468502 = product of:
0.04937004 = sum of:
0.04937004 = product of:
0.09874008 = sum of:
0.09874008 = weight(_text_:22 in 6091) [ClassicSimilarity], result of:
0.09874008 = score(doc=6091,freq=2.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.61904186 = fieldWeight in 6091, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.125 = fieldNorm(doc=6091)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 13. 7.2008 19:53:22
-
Tonta, Y.; Ünal, Y.: Scatter of journals and literature obsolescence reflected in document delivery requests (2005)
0.02
0.024318237 = product of:
0.048636474 = sum of:
0.048636474 = sum of:
0.023951454 = weight(_text_:c in 3271) [ClassicSimilarity], result of:
0.023951454 = score(doc=3271,freq=2.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.1524436 = fieldWeight in 3271, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.03125 = fieldNorm(doc=3271)
0.02468502 = weight(_text_:22 in 3271) [ClassicSimilarity], result of:
0.02468502 = score(doc=3271,freq=2.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.15476047 = fieldWeight in 3271, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.03125 = fieldNorm(doc=3271)
0.5 = coord(1/2)
- Abstract
- In this paper we investigate the scattering of journals and literature obsolescence reflected in more than 137,000 document delivery requests submitted to a national document delivery service. We first summarize the major findings of the study with regards to the performance of the service. We then identify the "core" journals from which article requests were satisfied and address the following research questions: (a) Does the distribution of (core) journals conform to the Bradford's Law of Scattering? (b) Is there a relationship between usage of journals and impact factors, journals with high impact factors being used more often than the rest? (c) Is there a relationship between usage of journals and total citation counts, journals with high total citation counts being used more often than the rest? (d) What is the median age of use (half-life) of requested articles in general? (e) Do requested articles that appear in core journals get obsolete more slowly? (f) Is there a relationship between obsolescence and journal impact factors, journals with high impact factors being obsolete more slowly? (g) Is there a relationship between obsolescence and total citation counts, journals with high total citation counts being obsolete more slowly? Based an the analysis of findings, we found that the distribution of highly and moderately used journal titles conform to Bradford's Law. The median age of use was 8 years for all requested articles. Ninety percent of the articles requested were 21 years of age or younger. Articles that appeared in 168 core journal titles seem to get obsolete slightly more slowly than those of all titles. We observed no statistically significant correlations between the frequency of journal use and ISI journal impact factors, and between the frequency of journal use and ISI- (Institute for Scientific Information, Philadelphia, PA) cited half-lives for the most heavily used 168 core journal titles. There was a weak correlation between usage of journals and ISI-reported total citation counts. No statistically significant relationship was found between median age of use and journal impact factors and between median age of use and total citation counts. There was a weak negative correlation between ISI journal impact factors and cited half-lives of 168 core journals, and a weak correlation between ISI citation halflives and use half-lives of core journals. No correlation was found between cited half-lives of 168 core journals and their corresponding total citation counts as reported by ISI. Findings of the current study are discussed along with those of other studies.
- Date
- 20. 3.2005 10:54:22
-
Van der Veer Martens, B.: Do citation systems represent theories of truth? (2001)
0.02
0.02181868 = product of:
0.04363736 = sum of:
0.04363736 = product of:
0.08727472 = sum of:
0.08727472 = weight(_text_:22 in 3925) [ClassicSimilarity], result of:
0.08727472 = score(doc=3925,freq=4.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.54716086 = fieldWeight in 3925, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.078125 = fieldNorm(doc=3925)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 22. 7.2006 15:22:28
-
Liu, Z.; Wang, C.: Mapping interdisciplinarity in demography : a journal network analysis (2005)
0.02
0.02095752 = product of:
0.04191504 = sum of:
0.04191504 = product of:
0.08383008 = sum of:
0.08383008 = weight(_text_:c in 4384) [ClassicSimilarity], result of:
0.08383008 = score(doc=4384,freq=2.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.5335526 = fieldWeight in 4384, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.109375 = fieldNorm(doc=4384)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Lewison, G.: ¬The work of the Bibliometrics Research Group (City University) and associates (2005)
0.02
0.018513763 = product of:
0.037027527 = sum of:
0.037027527 = product of:
0.07405505 = sum of:
0.07405505 = weight(_text_:22 in 4890) [ClassicSimilarity], result of:
0.07405505 = score(doc=4890,freq=2.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.46428138 = fieldWeight in 4890, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.09375 = fieldNorm(doc=4890)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 20. 1.2007 17:02:22
-
Samoylenko, I.; Chao, T.-C.; Liu, W.-C.; Chen, C.-M.: Visualizing the scientific world and its evolution (2006)
0.02
0.015556926 = product of:
0.031113852 = sum of:
0.031113852 = product of:
0.062227704 = sum of:
0.062227704 = weight(_text_:c in 5911) [ClassicSimilarity], result of:
0.062227704 = score(doc=5911,freq=6.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.3960601 = fieldWeight in 5911, product of:
2.4494898 = tf(freq=6.0), with freq of:
6.0 = termFreq=6.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.046875 = fieldNorm(doc=5911)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Grazia Colonia; Dimmler, E.; Dresel, R.; Messner, C.; Krobath, A.; Petz, S.; Sypien, M.; Boxen, P. van; Harders, M.; Heuer, D.; Jordans, I.; Juchem, K.; Linnertz, M.; Mittelhuber, I.; Schwammel, S.; Schlögl, C.; Stock, W.G.: Informationswissenschaftliche Zeitschriften in szientometrischer Analyse (2002)
0.01
0.014819207 = product of:
0.029638413 = sum of:
0.029638413 = product of:
0.059276827 = sum of:
0.059276827 = weight(_text_:c in 1075) [ClassicSimilarity], result of:
0.059276827 = score(doc=1075,freq=4.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.3772787 = fieldWeight in 1075, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.0546875 = fieldNorm(doc=1075)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Raan, A.F.J. van: Statistical properties of bibliometric indicators : research group indicator distributions and correlations (2006)
0.01
0.013091208 = product of:
0.026182417 = sum of:
0.026182417 = product of:
0.052364834 = sum of:
0.052364834 = weight(_text_:22 in 5275) [ClassicSimilarity], result of:
0.052364834 = score(doc=5275,freq=4.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.32829654 = fieldWeight in 5275, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=5275)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 22. 7.2006 16:20:22
-
Larivière, V.; Gingras, Y.; Archambault, E.: ¬The decline in the concentration of citations, 1900-2007 (2009)
0.01
0.013091208 = product of:
0.026182417 = sum of:
0.026182417 = product of:
0.052364834 = sum of:
0.052364834 = weight(_text_:22 in 2763) [ClassicSimilarity], result of:
0.052364834 = score(doc=2763,freq=4.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.32829654 = fieldWeight in 2763, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.046875 = fieldNorm(doc=2763)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 22. 3.2009 19:22:35
-
Schlögl, C.; Gorraiz, J.; Bart, C.; Bargmann, M.: Messen und gemessen werden : Möglichkeiten und Grenzen quantitativer Forschungsevaluierungen am Beispiel eines Institutsvergleichs (2001)
0.01
0.012702176 = product of:
0.025404353 = sum of:
0.025404353 = product of:
0.050808705 = sum of:
0.050808705 = weight(_text_:c in 5958) [ClassicSimilarity], result of:
0.050808705 = score(doc=5958,freq=4.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.32338172 = fieldWeight in 5958, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.046875 = fieldNorm(doc=5958)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Sugimoto, C.R.; Pratt , J.A.; Hauser, K.: Using field cocitation analysis to assess reciprocal and shared impact of LIS/MIS fields (2008)
0.01
0.012702176 = product of:
0.025404353 = sum of:
0.025404353 = product of:
0.050808705 = sum of:
0.050808705 = weight(_text_:c in 1959) [ClassicSimilarity], result of:
0.050808705 = score(doc=1959,freq=4.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.32338172 = fieldWeight in 1959, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.046875 = fieldNorm(doc=1959)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- This study utilized bibliometric tools to analyze the relationship between two separate, but related, fields: Library and Information Science (LIS) and Management Information Systems (MIS). The top-ranked 48 journals in each field were used as the unit of analysis. Using these journals, field cocitation was introduced as a method for evaluating the relationships between the two fields. The three-phased study evaluated (a) the knowledge imported/exported between LIS and MIS, (b) the body of knowledge influenced by both fields, and (c) the overlap in fields as demonstrated by multidimensional scaling. Data collection and analysis were performed using DIALOG and SPSS programs. The primary findings from this study indicate that (a) the MIS impact on LIS is greater than the reverse, (b) there is a growing trend for shared impact between the two disciplines, and (c) the area of overlap between the two fields is predominately those journals focusing on technology systems and digital information. Additionally, this study validated field cocitation as a method by which to evaluate relationships between fields.
-
Thelwall, M.; Ruschenburg, T.: Grundlagen und Forschungsfelder der Webometrie (2006)
0.01
0.01234251 = product of:
0.02468502 = sum of:
0.02468502 = product of:
0.04937004 = sum of:
0.04937004 = weight(_text_:22 in 77) [ClassicSimilarity], result of:
0.04937004 = score(doc=77,freq=2.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.30952093 = fieldWeight in 77, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=77)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 4.12.2006 12:12:22
-
Rostaing, H.; Barts, N.; Léveillé, V.: Bibliometrics: representation instrument of the multidisciplinary positioning of a scientific area : Implementation for an Advisory Scientific Committee (2007)
0.01
0.01234251 = product of:
0.02468502 = sum of:
0.02468502 = product of:
0.04937004 = sum of:
0.04937004 = weight(_text_:22 in 1144) [ClassicSimilarity], result of:
0.04937004 = score(doc=1144,freq=2.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.30952093 = fieldWeight in 1144, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=1144)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 30.12.2007 11:22:39
-
Pernik, V.; Schlögl, C.: Möglichkeiten und Grenzen von Web Structure Mining am Beispiel von informationswissenschaftlichen Hochschulinstituten im deutschsprachigen Raum (2006)
0.01
0.011975727 = product of:
0.023951454 = sum of:
0.023951454 = product of:
0.04790291 = sum of:
0.04790291 = weight(_text_:c in 78) [ClassicSimilarity], result of:
0.04790291 = score(doc=78,freq=2.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.3048872 = fieldWeight in 78, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.0625 = fieldNorm(doc=78)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Kurtz, M.J.; Eichhorn, G.; Accomazzi, A.; Grant, C.; Demleitner, M.; Henneken, E.; Murray, S.S.: ¬The effect of use and access on citations (2005)
0.01
0.011975727 = product of:
0.023951454 = sum of:
0.023951454 = product of:
0.04790291 = sum of:
0.04790291 = weight(_text_:c in 1064) [ClassicSimilarity], result of:
0.04790291 = score(doc=1064,freq=2.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.3048872 = fieldWeight in 1064, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.0625 = fieldNorm(doc=1064)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Tscherteu, G.; Langreiter, C.: Explorative Netzwerkanalyse im Living Web (2009)
0.01
0.011975727 = product of:
0.023951454 = sum of:
0.023951454 = product of:
0.04790291 = sum of:
0.04790291 = weight(_text_:c in 4870) [ClassicSimilarity], result of:
0.04790291 = score(doc=4870,freq=2.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.3048872 = fieldWeight in 4870, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.0625 = fieldNorm(doc=4870)
0.5 = coord(1/2)
0.5 = coord(1/2)
-
Levitt, J.M.; Thelwall, M.: Citation levels and collaboration within library and information science (2009)
0.01
0.01090934 = product of:
0.02181868 = sum of:
0.02181868 = product of:
0.04363736 = sum of:
0.04363736 = weight(_text_:22 in 2734) [ClassicSimilarity], result of:
0.04363736 = score(doc=2734,freq=4.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.27358043 = fieldWeight in 2734, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0390625 = fieldNorm(doc=2734)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Collaboration is a major research policy objective, but does it deliver higher quality research? This study uses citation analysis to examine the Web of Science (WoS) Information Science & Library Science subject category (IS&LS) to ascertain whether, in general, more highly cited articles are more highly collaborative than other articles. It consists of two investigations. The first investigation is a longitudinal comparison of the degree and proportion of collaboration in five strata of citation; it found that collaboration in the highest four citation strata (all in the most highly cited 22%) increased in unison over time, whereas collaboration in the lowest citation strata (un-cited articles) remained low and stable. Given that over 40% of the articles were un-cited, it seems important to take into account the differences found between un-cited articles and relatively highly cited articles when investigating collaboration in IS&LS. The second investigation compares collaboration for 35 influential information scientists; it found that their more highly cited articles on average were not more highly collaborative than their less highly cited articles. In summary, although collaborative research is conducive to high citation in general, collaboration has apparently not tended to be essential to the success of current and former elite information scientists.
- Date
- 22. 3.2009 12:43:51
-
Burrell, Q.L.: Predicting future citation behavior (2003)
0.01
0.010799696 = product of:
0.021599391 = sum of:
0.021599391 = product of:
0.043198783 = sum of:
0.043198783 = weight(_text_:22 in 3837) [ClassicSimilarity], result of:
0.043198783 = score(doc=3837,freq=2.0), product of:
0.15950468 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.045548957 = queryNorm
0.2708308 = fieldWeight in 3837, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=3837)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 29. 3.2003 19:22:48
-
Schlögl, C.: Informationskompetenz am Beispiel einer szientometrischen Untersuchung zum Informationsmanagement (2000)
0.01
0.01047876 = product of:
0.02095752 = sum of:
0.02095752 = product of:
0.04191504 = sum of:
0.04191504 = weight(_text_:c in 5485) [ClassicSimilarity], result of:
0.04191504 = score(doc=5485,freq=2.0), product of:
0.15711682 = queryWeight, product of:
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.045548957 = queryNorm
0.2667763 = fieldWeight in 5485, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.4494052 = idf(docFreq=3817, maxDocs=44218)
0.0546875 = fieldNorm(doc=5485)
0.5 = coord(1/2)
0.5 = coord(1/2)
