實用醫(yī)學(xué)信息檢索與利用1594a

1、外文經(jīng)典綜合性數(shù)據(jù)資源檢索與利用oScopus實用醫(yī)學(xué)信息檢索與利用 4aIntroduction pE ls ev ie r 公司于2 0 0 4 年底推出。pElsevier, the modern publishing company, was founded in 1880 in Netherland. It has evolved from a small Dutch publishing house devoted to classical scholarship into an international multimedia publishing company with ov

2、er 20,000 products for educational and professional science and healthcare communities worldwide.pElsevier is a world-leading provider of information solutions that enhance the performance of science, health, and technology professionals, empowering them to make better decisions, deliver better care

3、, and sometimes make groundbreaking discoveries, that advance the boundaries of knowledge and human progress.pElsevier provides web-based, digital solutions among them ScienceDirect, Scopus, Elsevier Research Intelligence, and ClinicalKey and publishes nearly 2,200 journals, including The Lancet and

4、 Cell, and over 25,000 book titles, including a number of iconic reference works.Scopus o The largest abstract and citation database of peer-reviewed literature: scientific journals, books and conference proceedings. o Delivering a comprehensive overview of the worlds research output in the fields o

5、f science, technology, medicine, social sciences, and arts and humanities.o Scopus features smart tools to track, analyze and visualize research.o 53 million records 21,915 titles o 5,000 publishersScopus: SearchpSearch by document, author or affiliation, or use Advanced SearchpRefine results by sou

6、rce type, year, language, author, affiliation and morepLink to full-text articles and other library resourcespUse the QUOSA Information Manager to bulk retrieve results in .pdf formatpExport data to Reference Managers such as Mendeley, RefWorks and EndNotepStay up-to-date with Email Alerts, RSS and

7、HTML feedsScopus: DiscoveroFind related documents by shared references, authors and/or keywordsoIdentify and match an organization with its research output using Affiliation IdentifieroIdentify collaborators or subject experts with Author IdentifieroClarify your identity through integration with ORC

8、IDoBenefit from indexing with Universal Discovery Services: EBSCOHost, Primo and SummonoTake advantage of interoperability with ScienceDirect, Reaxys and Engineering VillageScopus: AnalyzepTrack citations over time for a set of authors or documents, with Citation Overview/TrackerpView h-index for sp

9、ecific authorspAssess trends in search results with Analyze Results pAnalyze an authors publishing output with Author EvaluatorpGain insight into journal performance with Journal Analyzer and alternative journal impact metrics SNIP and SJRScopus: Search methodso Document search(field search)o Author

10、 searcho Affiliation searcho Advanced searcho Limit to (data range、document type、subject areas)o Browse sourcesFor example 1:Searching articles about “primary hypertension” limited:(1) in all fields(2) in article title(3) in article title with phrase searchIn all fieldsin article titleIn title for a

11、 loose or approximate phrase “ ”o “primary hypertension” 882In title for an exact phrase o primary hypertension 878Abstract Export Browse sourcesCompare journals: one Compare journals: more Analyze search results Analyze search results: extend與wos比較o Scopus “分析檢索結(jié)果”：可視化圖譜及其延伸o 期刊分析中可比較各期刊的指標(biāo)o Scopus

12、 不能對所有檢索結(jié)果進行引文分析，只能選擇文獻后方可實施。Exercise o檢索shoenfeld,y所寫systemic lupus erythematosus的文獻.獲取該作者scopus ID號，了解該作者在scopus的統(tǒng)計數(shù)據(jù)，并 分析文章產(chǎn)出情況。（Analyze author output） oRalph A. Defronzo發(fā)表在diabetes （糖尿病）雜志上的文獻。oChen YH, et al. KCNQ1 gain-of-function mutation in familial atrial fibrillation SCIENCE 2003,299(5604)

13、:251-254 做引文分析。o對出現(xiàn)在標(biāo)題中的“Embryonic Stem Cells”的文獻做結(jié)果分析。o檢索復(fù)旦聞玉梅教授文章共多少篇？And by “Analyze author output” ，view Citation overview. o獲取期刊Ca-A Cancer Journal for Clinicians的兩個scopus期刊評價指標(biāo)，并與JCR中IF比較。Exerciseo Search articles about “systemic lupus erythematosus” by Y.Shoenfeld, and analyzing the results.

14、o Citation overview: Chen YH, et al. KCNQ1 gain-of-function mutation in familial atrial fibrillation SCIENCE 2003,299(5604):251-254.o Search articles published by 聞玉梅(wen yumei). And to Analyze author output，view Citation overview. About several indices: SJRoSJR (SCImago Journal Rank) is weighted by

15、 the prestige of a journal. Subject field, quality, and reputation of the journal have a direct effect on the value of a citation. SJR also normalizes for differences in citation behavior between subject fields. Four years of data are needed to calculate a SJR. Scopus has complete citation data from

16、 1996, so the first SJR value available is for 1999.oSJR assigns relative scores to all of the sources in a citation network. Its methodology is inspired by the Google PageRank algorithm, in that not all citations are equal. A source transfers its own prestige, or status, to another source through t

17、he act of citing it. A citation from a source with a relatively high SJR is worth more than a citation from a source with a lower SJR.oA sources prestige for a particular year is shared equally over all the citations it makes in that year; this is important because it corrects for the fact that typi

18、cal citation counts vary widely between subject fields. oThe SJR of a source in a field with a high likelihood of citing is shared over a lot of citations, so each citation is worth relatively little. oThe SJR of a source in a field with a low likelihood of citing is shared over few citations, so ea

19、ch citation is worth relatively much. The result is to even out the differences in citation practice between subject fields and facilitate direct comparisons of sources.oSJR emphasizes those sources that are used by prestigious titles. SJR allows the user to rank their own customized set of sources,

20、 regardless of their subject fields.About several indices: SNIPoSNIP measures a sources contextual citation impact by weighting citations based on the total number of citations in a subject field. oSNIP takes into account characteristics of the sources subject field, which is the set of documents ci

21、ting that source. oSNIP especially considersothe frequency at which authors cite other papers in their reference listsothe speed at which citation impact maturesothe extent to which the database used in the assessment covers the fields literatureoSNIP is the ratio of a sources average citation count

22、 per paper and the citation potential of its subject field. （每篇論文一種信息來源的平均引文數(shù)量與該主題領(lǐng)域的引文潛力的比值）About citation potential oThe citation potential of a sources subject field is the average number of references per document citing that source. It represents the likelihood of being cited for documents in a

23、 particular field. A source in a field with a high citation potential tends to have a high impact per paper.oCitation potential is important because it accounts for the fact that typical citation counts vary widely between research disciplines. For example, they tend to be higher in life sciences th

24、an in mathematics or social sciences. If papers in one subject field contain an average of 40 cited references while those in another contain an average of 10, then the former field has a citation potential that is 4 times higher than that of the latter.oCitation potential also varies between subjec

25、t fields within a discipline. For instance, basic journals tend to show higher citation potentials than applied or clinical journals, and journals covering emerging topics tend to have higher citation potentials than periodicals in well established areas.SJR SNIPoSJR(SCImago Journal Rank)基于scopus數(shù)據(jù)庫

26、的期刊聲望評價指標(biāo)。由西班牙SCImago研究小組于2007年提出。利用google的page rank算法來測量期刊的聲望，并考慮學(xué)科、期刊的質(zhì)量和聲望對其引文價值的影響，而不僅是引文的數(shù)量，并排除期刊自引。故而可以彌補不同學(xué)科引文行為的差異。oSJR引文計算時間3年。計算用的文獻類型包括論文、會議錄文獻和綜述。可免費獲?。?oSNIP（Source Normalized Impact per Paper）測量不同主題領(lǐng)域引文影響力指標(biāo)。由荷蘭萊頓大學(xué)社會科學(xué)學(xué)院科技中心研究員Moed于2010年提出。在Scopus中基于同行評議期刊論文間的引文進行計算，降低人為操控的可能性。計算時間3年。

27、統(tǒng)計數(shù)據(jù)源不同，并增加標(biāo)準(zhǔn)化處理過程。修正學(xué)科間的差異及同一學(xué)科領(lǐng)域基礎(chǔ)研究與應(yīng)用或臨床間的差異。 Comparison of SCImago journal rank indicator with journal impact factor. FASEB J. 2008 Aug;22(8):2623-8. doi: 10.1096/fj.08-107938. Epub 2008 Apr 11.oThe application of currently available sophisticated algorithms of citation analysis allows for the

28、incorporation of the quality of citations in the evaluation of scientific journals. We sought to compare the newly introduced SCImago journal rank (SJR) indicator with the journal impact factor (IF). We retrieved relevant information from the official Web sites hosting the above indices and their so

29、urce databases. The SJR indicator is an open-access resource, while the journal IF requires paid subscription. The SJR indicator (based on Scopus data) lists considerably more journal titles published in a wider variety of countries and languages, than the journal IF (based on Web of Science data).

30、Both indices divide citations to a journal by articles of the journal, during a specific time period. However, contrary to the journal IF, the SJR indicator attributes different weight to citations depending on the prestige of the citing journal without the influence of journal self-citations; prest

31、ige is estimated with the application of the PageRank algorithm in the network of journals. In addition, the SJR indicator includes the total number of documents of a journal in the denominator of the relevant calculation, whereas the journal IF includes only citable articles (mainly original articl

32、es and reviews). A 3-yr period is analyzed in both indices but with the use of different approaches. Regarding the top 100 journals in the 2006 journal IF ranking order, the median absolute change in their ranking position with the use of the SJR indicator is 32 (1st quartile: 12; 3rd quartile: 75).

33、 Although further validation is warranted, the novel SJR indicator poses as a serious alternative to the well-established journal IF, mainly due to its open-access nature, larger source database, and assessment of the quality of citations.oThe SJR indicator is an open-access resource, while the jour

34、nal IF requires paid subscription. oThe SJR indicator (based on Scopus data) lists considerably more journal titles published in a wider variety of countries and languages, than the journal IF (based on Web of Science data). Both indices divide citations to a journal by articles of the journal, duri

35、ng a specific time period. ocontrary to the journal IF, the SJR indicator attributes different weight to citations depending on the prestige of the citing journal without the influence of journal self-citations; prestige is estimated with the application of the PageRank algorithm in the network of j

36、ournals. othe SJR indicator includes the total number of documents of a journal in the denominator of the relevant calculation, whereas the journal IF includes only citable articles (mainly original articles and reviews). Citation analysis of orthopaedic literature; 18 major orthopaedic journals com

37、pared for Impact Factor and SCImago. BMC Musculoskelet Disord. 2010 Jan 4;11:4. doi: 10.1186/1471-2474-11-4. Siebelt M, et al.oBACKGROUND: One of the disadvantages of the Impact Factor (IF) is self-citation. The SCImago Journal Rank (SJR) indicator excludes self-citations and considers the quality,

38、rather than absolute numbers, of citations of a journal by other journals. The present study re-evaluated the influence of self-citation on the 2007 IF for 18 major orthopaedic journals and investigated the difference in ranking between IF and SJR.oMETHODS: The journals were analysed for self-citati

39、on both overall and divided into a general group (n = 8) and a specialized group (n = 10). Self-cited and self-citing rates, as well as citation densities and IFs corrected for self-citation (cIF), were calculated. The rankings of the 18 journals by IF and by SJR were compared and the absolute diffe

40、rence between these rankings (DeltaR) was determined.oRESULTS: Specialized journals had higher self-citing rates (p = 0.01, Deltamedian = 9.50, 95%CI -19.42 to 0.42), higher self-cited rates (p = 0.0004, Deltamedian =-10.50, 95%CI -15.28 to -5.72) and greater differences between IF and cIF (p =0.003, Deltamedian = 3.50, 95%CI -6.1 to 13.1). Th