# Analysis of Trends in Korean BIM Research and Technologies Using Text Mining
## 3 Research Methodology
### Data Collection  
The collection of data for the research trend analysis was limited to the range of Korean citation index (KCI) literature published until 2017 in Korea with BIM as the search keyword. The search was conducted in three databases, DBpia(dbpia.co.kr), RISS(riss.kr), and KISS(kiss.kstudy.com), with the research results not related to BIM and duplicate results by sites excluded. Four hundred and fifty papers were considered.  
In our analysis of the trends of these papers by year, following Figure 1, we found that a paper containing the keyword \"BIM\" was first published in 2004, with a steady increase in the number of such papers; however, there was a slight decrease in this trend since 2013. In this study, we notice three distinct periods: In Period A (introduction), the introduction of BIM and BIM-related research steadily increased from 2004 to 2010; in Period B (development), BIM-related research increased sharply from 2011 to 2013; and in period C (adaptation), it gradually declined from 2014 to 2017.  
Nine institutes in total published more than 10 papers in the academic societies. The most widely published papers are those by the Architectural Society of Korea, Korea Institute of Construction Management, Korea CDE(Computational Design and Engineering) Society, Korean Academy of Industrial Science and Technology, Korea Institute of Construction Technology, the Design Convergence Association, Korea Spatial Information System Society, Computational Structural Engineering Institute of Korea, and South Korea Ecological Environment Building Society.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Keywords**} & **2013** & **2014** & **2015** & **2016** & **2017** & **Total** \\ \hline \multirow{8}{*}{**BIM**} & **Trend** & 152 & 197 & 227 & 282 & 351 & 1209 \\ \cline{2-7}  & **Analysis** & 134 & 184 & 205 & 254 & 319 & 1096 \\ \cline{2-7}  & **Policy** & 32 & 45 & 54 & 54 & 105 & 290 \\ \cline{2-7}  & **Cooperation** & 18 & 19 & 26 & 22 & 51 & 136 \\ \cline{2-7}  & **Status** & 71 & 70 & 76 & 94 & 122 & 433 \\ \cline{2-7}  & **Problem** & 73 & 109 & 37 & 168 & 210 & 697 \\ \cline{2-7}  & **Risk** & 55 & 76 & 99 & 125 & 171 & 526 \\ \cline{2-7}  & **Limitation** & 57 & 85 & 101 & 125 & 169 & 537 \\ \hline \multicolumn{2}{c}{**Total**} & 592 & 785 & 925 & 1124 & 1498 & 4924 \\ \hline \hline \end{tabular}
\end{table}
Table 1: International research trends related to building information modeling (BIM) (ScienceDirect).  
According to Figure 2, Though the first paper was published in 2004, it was not until 2009 that various conferences and dissertations began to be published. In particular, following Figure 3, attempts at fusing BIM with other fields such as construction and structural development has been noticeable since 2011. Recently, studies have been undertaken in nonarchitectural fields, and not only by institutes related to information communication, such as the Korea Internet Information Society and the Korea Digital Contents Society, but also by institutes such as the Korea Railroad Society and the Korea Waterworks and Sewer Society.  
Figure 1: Research flow chart.  
Figure 2: Total number of published papers per year