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<Paper uid="I05-2043">
  <Title>Trend Survey on Japanese Natural Language Processing Studies over the Last Decade</Title>
  <Section position="2" start_page="0" end_page="250" type="intro">
    <SectionTitle>
1 Introduction
</SectionTitle>
    <Paragraph position="0"> We conducted a trend survey on Japanese natural language processing studies that have been done over the last ten years. We used bibliographic information from journal papers and annual conference papers of the Association for Natural Language Processing, Japan (The Association for Natural Language Processing, 19952004; The Association for Natural Language Processing, 1994-2003). Just ten years have passed since the association was established. Therefore, we can use the bibliographic information from the past ten years. In this study, we investigated what kinds of studies have been presented in journal papers and annual conference papers on the Association for Natural Language Processing, Japan.</Paragraph>
    <Paragraph position="1"> We first digitized documents listed in the bibliographic information and then extracted various pieces of useful information for the trend survey.</Paragraph>
    <Paragraph position="2">  We also examined the changes in the number of papers put up by each Japanese research organization and the changes in the number of papers written on specific research areas. Moreover, we examined the relationship between each Japanese research organization and each research area. This study is useful for trend surveys of studies performed by members of in the Association for Natural Language Processing, Japan.</Paragraph>
    <Paragraph position="3"> 2 Trend survey on NLP research studies We show the changes in the number of journal papers and conference papers in Figure 1. Journal papers are reviewed, but conference papers are not reviewed in the association. In comparing the journal papers and conference papers, we found that the number of conference papers was much larger than that of journal papers. We also found that although both types of papers decreased in number at some point, they both demonstrate an upward trend.</Paragraph>
    <Paragraph position="4"> Conference papers have a temporal peak in the fourth year and a temporal drop in the sixth year,  by each research organization (The two numbers in the parentheses indicate the total number of papers and the average value of published years.) while journal papers have a peak in the sixth year and a drop in the eighth year. The temporal peak and drop of the journal papers occurred just two years after the peak and drop of the conference papers. We presume this is because journal papers need more time for reviewing and publishing, and because journal papers are presented later than conference papers for studies performed at the same time.</Paragraph>
  </Section>
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