共查询到20条相似文献,搜索用时 15 毫秒
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Scientometrics - Due to the development of academic, more and more attentions are paid to citation recommendation. To solve the citation recommendation problem, researchers begin to focus on the... 相似文献
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Literature retrieval based on citation context 总被引:2,自引:0,他引:2
While the citation context of a reference may provide detailed and direct information about the nature of a citation, few studies have specifically addressed the role of this information in retrieving relevant documents from the literature primarily due to the lack of full text databases. In this paper, we design a retrieval system based on full texts in the PubMed Central database. We constructed two modules in the retrieval system. One is a reference retrieval module based on citation contexts. Another is a citation context retrieval module for searching the citation contexts of a specific paper. The results of comparisons show that the reference retrieval module performed better than Google Scholar and PubMed database in terms of finding proper references based on topic words extracted from citation context. It also performed very well on searching highly cited papers and classic papers. The citation context retrieval module visualizes the topics of citation contexts as tag clouds and classifies citation contexts based on cue words in citation contexts. 相似文献
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The citation motivations among 51 self citing authors in several natural science disciplines were investigated. Results of a survey on reasons for both self citation and citation to others show that there are very few differences in motivation, and that there are plausible intellectual grounds for those differences which are substantial. Analysis of exposure in text reveals virtually no differences between self citations and citations to others. Analysis of individual disciplines also uncover no substantive differences in either motivation or exposure in text. 相似文献
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Identification of referencing and citation processes of scientific journals based on the citation distribution model 总被引:1,自引:0,他引:1
In this article, we firstly analyze the referencing process and the citation process of a scientific journal in theory, and
find that the observed referencing or citation process includes the diffusing process and the aging process of cited literature
and the publishing process of citing literature, thereby it is illuminated why the identified average publication delay ( [`(T)] = Ts + t ) \left( {\bar{T} = T_{s} + \tau } \right) was longer than the observed value. Secondly, we compare the transfer function model of the observed citing process with
other classical citation distribution models and find that the model is superior to others. Finally, using the model, we identify
parameters of actual referencing and citation processes from data of age distributions of references and citations of 38 journals
of neurology and applied mathematics in JCR, respectively; and then compare differences of identified parameters and obtain
some interesting conclusions. 相似文献
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Loet Leydesdorff 《Scientometrics》2013,94(1):35-55
One is inclined to conceptualize impact in terms of citations per publication, and thus as an average. However, citation distributions are skewed, and the average has the disadvantage that the number of publications is used in the denominator. Using hundred percentiles, one can integrate the normalized citation curve and develop an indicator that can be compared across document sets because percentile ranks are defined at the article level. I apply this indicator to the set of 58 journals in the WoS Subject Category of “Nanoscience & nanotechnology,” and rank journals, countries, cities, and institutes using non-parametric statistics. The significance levels of results can thus be indicated. The results are first compared with the ISI-impact factors, but this Integrated Impact Indicator (I3) can be used with any set downloaded from the (Social) Science Citation Index. The software is made publicly available at the Internet. Visualization techniques are also specified for evaluation by positioning institutes on Google Map overlays. 相似文献
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The number of citations of journal papers is an important measure of the impact of research. Thus, the modeling of citation
behavior needs attention. Burrell, Egghe, Rousseau and others pioneered this type of modeling. Several models have been proposed
for the citation distribution. In this note, we derive the most comprehensive collection of formulas for the citation distribution,
covering some 17 flexible families. The corresponding estimation procedures are also derived by the method of moments. We
feel that this work could serve as a useful reference for the modeling of citation behavior. 相似文献
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A. Schubert 《Scientometrics》1996,35(3):393-399
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A. Schubert 《Scientometrics》1996,36(2):273-280
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A. Schubert 《Scientometrics》1996,35(1):155-163
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A. Schubert 《Scientometrics》1996,36(1):131-140
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Summary For all rankings of countries research output based on number of publications or citations compared with population, GDP, R&D and public R&D expenses, and other national characteristics the counting method is decisive. Total counting (full credit to a country when at least one of the authors is from this country) and Fractional Counting (a country receives a fraction of full credit for a publication equal to the fraction of authors from this country) of publications give widely different results. Counting methods must be stated, rankings based on different counting methods cannot be compared, and Fractional Counting is to be preferred. 相似文献
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Hamid Bouabid 《Scientometrics》2011,88(1):199-211
The study of citation distribution provides retrospective and prospective picture of the evolving impact of a corpus of publications
on knowledge community. All distribution models agree on the rise of the number of citations in the first years following
the publication to reach a peak and then tend to be less cited when time passes. However, questions such as how long it will
continue being cited and what is objectively the rate of the decline remain unanswered. Built up of simple polynomial function,
the proposed model is proven to be suitable to represent the observed citation distribution over time and to interestingly
identify with accuracy when the major loss of citations happens. I calculate from the model the ‘residual citations’ representing the citations kept after a long time period after publication year. I demonstrate that the residual citations
may be greater than or equal to zero, meaning that the ‘life-cycle’ of the corpus is infinite, contrary to what some researches
termed to be around 21 years. This model fits the observed data from SCI according to R-sq which is greater than 98.9%. Rather, it is very simple and easy to implement and can be used by not highly-skilled
scientometric users. Finally, the model serves as a citation predictive tool for a corpus by determining the citations that
would obtain at any time of its life-cycle. 相似文献
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P. B. Slater 《Scientometrics》1983,5(1):55-58
Journal-to-journal citation matrices can be examined with a two-stage double-standardization and hierarchical clustering procedure that has been widely applied to other transaction flow tables. An illustration is given, using 1967–1975 citations between 22 mathematical journals. Groups oriented to analysis and to algebra are discerned. Certain journals, such as theProceedings of the American Mathematical Society, are shown to have broad, nonspecialized tjes with the other periodicals. 相似文献
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Pornprasit Chanathip Liu Xin Kiattipadungkul Pattararat Kertkeidkachorn Natthawut Kim Kyoung-Sook Noraset Thanapon Hassan Saeed-Ul Tuarob Suppawong 《Scientometrics》2022,127(1):233-264
Scientometrics - Automatic recommendation of citations has been a focal point of research in scholarly digital libraries. Many graph-based citation recommendation algorithms have been proposed;... 相似文献
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We find evidence for the universality of two relative bibliometric indicators of the quality of individual scientific publications taken from different data sets. One of these is a new index that considers both citation and reference counts. We demonstrate this universality for relatively well cited publications from a single institute, grouped by year of publication and by faculty or by department. We show similar behaviour in publications submitted to the arXiv e-print archive, grouped by year of submission and by sub-archive. We also find that for reasonably well cited papers this distribution is well fitted by a lognormal with a variance of around ??2?=?1.3 which is consistent with the results of Radicchi et al. (Proc Natl Acad Sci USA 105:17268?C17272, 2008). Our work demonstrates that comparisons can be made between publications from different disciplines and publication dates, regardless of their citation count and without expensive access to the whole world-wide citation graph. Further, it shows that averages of the logarithm of such relative bibliometric indices deal with the issue of long tails and avoid the need for statistics based on lengthy ranking procedures. 相似文献
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Hanlin You Mengjun Li Keith W. Hipel Jiang Jiang Bingfeng Ge Hante Duan 《Scientometrics》2017,111(1):297-315
A forecasting methodology for technology development trends is proposed based on a two-level network model consisting of knowledge-transfer among patents and patent subclasses, with the aim to confront the increasing complex challenge in technology investment and management. More specifically, the patents of the “coherent light generators” classification, granted from 1976 to 2014 by examiners of the United States Patent and Trademark Office, are collected and with which the first-level citation network is constructed first. Then, a new approach to assess patent importance from the perspective of topological structure is provided and the second-level citation network, which consists of patent subclasses, is produced with the evaluation results. Moreover, three assessment indices of the subclass citation network are abstracted as impact parameters for technology development trends. Finally, two typical time series models, the Bass and ARIMA model, are utilized and compared for development trend forecasting. Based on the results of evolution prediction and network analysis, the highlighted patent subclasses with more development potential are identified, and the correlation between technology development opportunity and topological structure of the patent citation network is discussed. 相似文献