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Search Symbol (Half-width) Description of Search Symbols
Space "AND" indicates the intertwining of key terms used in a search
Double Quotation Marks ("") ( " " ) Double quotation marks indicate the beginning and end of a phrase, and the search will only include terms that appear in the same order of those within the quotations. Example: "image process" : " image process "
? Indicates a variable letter. Entering two ? will indicate two variable letters, and so on. Example: "Appl?", search results will yield apple, apply… e , appl y … ( (often used to English word searches) )
* Indicates an unlimited number of variable letters to follow, from 1~n. Example: Enter "appl*", search results will yield apple, apples, apply, applied, application…(often used in English word searches) e , appl es , appl y , appl ied , appl ication … ( (often used to English word searches) )

Boolean logic combinations of key words is a skill used to expand or refine search parameters.
(1) AND (1) AND: Refines search parameters
(2) OR (2) OR: Expands search parameters (3) NOT: Excludes irrelevant parameters


DOI stands for Digital Object Identifier ( D igital O bject I dentifier ) ,
and is the unique identifier for objects on the internet. It can be used to create persistent link and to cite articles.

Using DOI as a persistent link

To create a persistent link, add「」 「 」 before a DOI.
For instance, if the DOI of an article is 10.5297/ser.1201.002 , you can link persistently to the article by entering the following link in your browser: 10.5297/ser.1201.002
The DOI link will always direct you to the most updated article page no matter how the publisher changes the document's position, avoiding errors when engaging in important research.

Cite a document with DOI

When citing references, you should also cite the DOI if the article has one. If your citation guideline does not include DOIs, you may cite the DOI link.

DOIs allow accurate citations, improve academic contents connections, and allow users to gain better experience across different platforms. Currently, there are more than 70 million DOIs registered for academic contents. If you want to understand more about DOI, please visit airiti DOI ) 。

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Reference ( 34 ) 〈TOP〉
  1. [4] Douglas W. Hubbard (2011), “Pulse: The New Science of Harnessing Internet Buzz to Track Threats and Opportunities,” 73-84.
  2. [9] Ladislav Kristoufek (2013), “BitCoin Meets Google Trends and Wikipedia: Quantifying the Relationship between Phenomena of the Internet Era,” Scientific Reports, 3:3415. (Retrieved from
  3. [10] Liwen Vaughan and Esteban Romero-Frías (2013), “Web Search Volume as a Predictor of Academic Fame: An Exploration of Google Trends,” Journal of the Association for Information Science and Technology, 65(4), 707-720. (Retrieved from
  4. [11] Sungjin Cho, Chang Hwan Sohn, Min Woo Jo, Soo-Yong Shin, Jae Ho Lee, Seoung Mok Ryoo, Won Young Kim and Dong-Woo Seo (2013), “Correlation between National Influenza Surveillance Data and Google Trends in South Korea,” Journal of PLOS ONE, 8(12), e81422. (Retrieved from
  5. [12] Damien Challet and Ahmed Bel Hadj Ayed (2014), “Do Google Trend data contain more predictability than price returns?,” SSRN Electronic Journal, March. (Retrieved from
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