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About DOI.

DOI stands for Digital Object Identifier and is a persistent identifier (PID) assigned to all types of content, including digital content. It is defined by the international standard ISO 26324.

Advantages of DOI

DOI offers two advantages.

  1. A permanent URL for accessing content
    Content registered with a DOI assigned a URL in the format https://doi.org/[DOI]. This permanent URL (permalink) allows users to access the content without any change to the URL, even if the UTokyo Repository server is relocated or otherwise changed in the future.
  2. A global identifier for content
    DOI is often used as persistent identifiers (PIDs) for research outputs, and various research reports, including reports related to the KAKENHI (Grants-in-Aid for Scientific Research), provide dedicated fields for entering DOI information. DOI can also be used to uniquely identify academic publications when research outputs are cited as references in scholarly works.

Content Eligible for DOI Registration

You can register a DOI with the UTokyo Repository for works that are primarily made publicly available through the repository.
Content that already has another DOI, or content that may be assigned another DOI in the future, is not eligible for DOI registration.
 

NOTE: All content registered in the UTokyo Repository is assigned a Handle.
Even if your content is not eligible for a DOI or you do not wish to register one, you can use the Handle ("http://hdl.handle.net/2261/...") as a persistent identifier (URL) for content registered in the UTokyo Repository. 
The Handle guarantees persistent access, just like a DOI.
 

DOI Format

  • A DOI is written as a combination of a prefix and a suffix separated by a slash (/).
    (Example) 10.15083/0002014017
    　→ "10.15083" is the prefix, and "0002014017" is the suffix.
  • The prefix is a fixed string assigned to the University of Tokyo by the DOI registration agency. The suffix varies depending on the content.
  • By adding "https://doi.org/" before a DOI, the DOI functions as a URL.

 

DOIs Available through UTokyo Repository

Only one DOI can be assigned to a single content item. When registering a DOI through the UTokyo Repository, you can choose either a JaLC DOI or a DataCite DOI.

JaLC DOI

  • 10.15083/suffix

A DOI provided by Japan Link Center (JaLC), the only DOI registration agency in Japan. The University of Tokyo is an associate member of JaLC through the National Institute of Informatics (NII).

DataCite DOI

  • 10.82337/suffix

A DOI managed by DataCite, an international DOI registration organization. 
A DataCite DOI serves as a persistent identifier and is indexed by external research data discovery services such as DataCite Commons, OpenAIRE Explorer, and Mendeley Data, thereby promoting the discovery and use of the associated content. 
In principle, DataCite DOIs are assigned to research data and to content registered through Self Archive.

 

DOIs for Version of Record (VoR)

In a Version of Record (VoR) has a DOI, UTokyo Repository displays it as related information and provides a link from the UTokyo Repository page to the publisher page.

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