About This Database

MeCab user dictionary: Nikkaji (Japan Chemical Substance Dictionary)

Data description

Data name

DOI

10.18908/lsdba.nbdc02358-003.V002

Description of data contents

A user dictionary for morphological analysis engine MeCab(<a href="http://taku910.github.io/mecab/" target="_blank">http://taku910.github.io/mecab/</a>) from J-GLOBAL science and technology terms that have linked to Japan Chemical Substance Dictionary (Nikkaji), an organic compound dictionary database prepared by the Japan Science and Technology Agency. The dictionary items are based on IPA dictionary. Csv file is encoded in Shift-JIS and dic file is encoded in UTF-8.

Data file

File name :

Nikkaji.dic.zip (MeCab dic format)

File URL :

https://dbarchive.biosciencedbc.jp/data/mecab/LATEST/Nikkaji.dic.zip

File size :

6.6 MB

Simple search URL

http://togodb.biosciencedbc.jp/togodb/view/mecab_nikkaji#en

Data acquisition method

IPA dictionary (mecab-ipadic-2.7.0-20070801 downloaded from MeCab's site [see above])、J-GLOBAL Knowledge

Data analysis method

Number of data entries

82,922 entries

Data detail

Data item	Description
Surface form	The word itself
Left-context ID	MeCab internal ID for left context (see http://taku910.github.io/mecab/dic.html)
Right-context ID	MeCab internal ID for right context (see http://taku910.github.io/mecab/dic.html)
Cost	The cost for the likelihood of the word to appear in a sentence (smaller, more likely)
POS	Part of speech
POS subcategory 1	POS subcategory 1
POS subcategory 2	POS subcategory 2
POS subcategory 3	POS subcategory 3
Conjugation type	Conjugation type
Conjugation form	Conjugation form
Base form	Same as the surface form
Reading('Furigana')	(empty)
Pronunciation	(empty)
Source dictionary	It is fixed as 'Nikkaji'.
ID in Source dictionary	MeSH UID
J-GLOBAL ID	ID in J-GLOBAL
Headword Flag	It is fixed as 'C'.
Category code	Category code of science fields in JST Thesaurus
Common word flag 1	・1: There is an entry (or entries) for the surface form in IPA dictionary・0: There are no entries for the surface in IPA dictionary
Common word flag 2	Based on "IPA dictionary analysis results":・When the value of Common word flag １ is 1, the value of this flag is the part of speech for the IPA dictionary analysis result.・When the value of Common word flag １ is 0:- UNKNOWN_1: if the result is one unknown word- UNKNOWN_2: if the result is multiple tokens including unknown word- MULTI_WORD: if the result is multiple tokens in IPA dictionary
IPA dictionary analysis results	Results of the morphological analysis with the original IPA dictionary (and the dictionary with IPA dictionary entries where zenkaku alphanumeric characters and symbols are converted into corresponding hankaku characters). If the result is devided into multiple tokens, it is whitespace-separated. It is not manually corrected.