A Scientometrics Study of Rough Sets in Three Decades

Transcription

1 A Scientometrics Study of Rough Sets in Three Decades JingTao Yao and Yan Zhang Department of Computer Science University of Regina [jtyao, Oct. 8, 2013

2 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 2/22 Introduction of Rough Sets proposed by Professor Zdzis law Pawlak in the early 1980s. a mathematical approach dealing with inconsistent and uncertain data. approximate a concept in terms of a pair of sets which give the lower and the upper approximation of the concept. be in a state of constant development over three decades. three approaches in rough set research: content based approach, method based approach, scientometric approach.

3 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 3/22 Scientometrics Method Scientometrics is the science that measures and analyzes science. We may gain more understanding of a research domain by examining its publications. Research impact may be measured by citations. Citation may be used as a bibliometric indicator to predict research influences and development. The more recent or current highly cited papers in a research field, the more likely the field will grow rapidly in the near future.

4 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 4/22 Web of Science Web of Science (WoS) is one of Thomson Reuters s key products. WoS collects bibliographic information of research articles of high quality journals and selected international conferences. The database collects not only bibliographic information but also the information of citation relationship amongst research articles.

5 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 5/22 Search in Web of Science A rough set paper: containing phrase rough sets or rough set or rough computing or rough computation. The Topic field is defined as the words or phrases within article titles, keywords, or abstracts. Not all rough set publications are included in the search, e.g., Transactions on Rough Sets.

6 Rough Set papers published in three decades N u m b e r o f P a p e rs P u b lic a tio n Y e a r J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 6/22

7 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 7/22 Most prolific authors Table: Most prolific authors Authors Papers Authors Papers Authors Papers Slowinski R 92 Hu QH 58 Grzymala-busse JW 43 Skowron A 91 Pal SK 57 Ramanna S 43 Yao YY 83 Miao DQ 55 Wang J 42 Wang GY 74 Chen DG 52 Polkowski L 41 Peters JF 72 Slezak D 52 Suraj Z 41 Wu WZ 70 Qian YH 48 Zhu W 40 Zhang WX 68 Li TR 47 Pawlak Z 39 Tsumoto S 67 Yu DR 46 Shi KQ 39 Greco S 66 Lin TY 44 Cheng CH 38 Liang JY 59 Ziarko W 44 Jensen R 37

8 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 8/22 Top 15 countries or territories Table: Top 15 countries or territories Countries Papers Countries Papers Countries Papers P. R. China 3741 India 290 Wales 67 Poland 660 Taiwan 286 Iran 64 USA 440 Italy 120 South Korea 62 Canada 428 England 91 Germany 61 Japan 356 Malaysia 76 Spain 59

9 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 9/22 Top 15 institutions Table: Top 15 institutions Organizations Papers Organizations Papers Univ Regina 177 Zhejiang Univ 87 N China Elect Power Univ 154 Zhejiang Ocean Univ 80 Chinese Acad Sci 132 Shanghai Jiaotong Univ 74 Polish Acad Sci 117 Univ Manitoba 74 Harbin Inst Technol 116 Tongji Univ 73 Xian Jiaotong Univ 106 Indian Stat Inst 68 SW Jiaotong Univ 99 Polish Japanese Inst Infor Technol 68 Warsaw Univ 93

10 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 10/22 Top 10 journals including rough set articles Table: Top 10 journals Journals Papers Information Sciences 230 Fundamenta Informaticae 160 Expert Systems with Applications 135 Advanced Materials Research 100 International Journal of Approximate Reasoning 83 Knowledge Based Systems 78 Applied Mechanics and Materials 65 European Journal of Operational Research 52 Fuzzy Sets and Systems 52 Computers Mathematics with Applications 41

11 Citation each year C ita tio n s Y e a r J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 11/22

12 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 12/22 Top 20 cited papers Table: Top 20 cited papers Paper Total Average Main Results Citations per Year 1 Pawlak Seminal paper, proposed RS 2 Ziarko Variable precision RS 3 Dubois Combining with fuzzy sets 4 Pawlak RS survey 5 Kryszkiewicz App - imcompete information table 6 Greco App - decision analysis 7 Pawlak Basic theory of RS 8 Slowinski Generalized RS 9 Pawlak RS survey 10 Mitra RS survey 11 Pawlak RS survey 12 Yao YY Research methods in RS 13 Kryszkiewicz App - imcompete information table 14 Yao YY Generalized RS using binary relation 15 Swiniarski App - feature selection 16 Pawlak App - data analysis 17 Yao YY Interpretation of RS 18 Wu WZ Combining with fuzzy sets 19 Pawlak App - data analysis 20 Polkowski Basic theory of RS

13 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 13/22 Classification of papers In top 20 cited papers, twelve papers are about basic rough set theory and generalized rough sets, two papers are about combining rough sets with other theories, six papers are about applications of rough sets. In top 200 cited papers, applications of rough sets and combination with other theories account for 27% and 49.5%. The number of papers about applications of rough sets in different areas are constantly increasing.

14 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 14/22 Impact authors Table: Impact authors Authors Cites cts Authors Cites cts Pawlak Z Jensen R Slowinski R Mi JS Skowron A Shen Q Yao YY Mitra S Ziarko W Zhu W Zhang WX Grzymalabusse J Greco S Hu QH Matarazzo B Pal SK Kryszkiewicz M Vanderpooten D Wu WZ Zopounidis C Dubios D Yu DR Prade H Hayashi Y 304 1

15 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 15/22 Top 20 cited papers in recent 5 years Table: Top 20 cited papers in recent 5 years Paper Total Average Main Results Citations per Year 1 Feng F Soft sets 2 Yao YY Reduction in DTRS 3 Yao YY Probabilistic rough sets 4 Hu QH App - feature subset selection 5 Zhu W Generalized RS 6 Hu QH App - neighborhood classifier 7 Jensen App - feature selection 8 Wu WZ Attribute reduction 9 Qian YH Reduction accelerator 10 Wang XZ App - rule induction 11 Thangavel Reduction (survey) 12 Liu GL Generalized RS 13 Qian YH Measures 14 Yang XB Dominance RS 15 Feng F Soft sets 16 Yao YY Introduced three-way decision 17 Xiao Z App - forecasting 18 Bai CG Combining with grey system 19 Li H App - prediction 20 Feng F Soft sets

16 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 16/22 Classification of papers In top 20 cited papers in recent 5 years, eight papers are about basic rough set theory and generalized rough sets, five papers are about combining rough sets with other theories, seven papers are about applications of rough sets. There are many new and young researchers, many of them from China, contributed to the highly cited papers in recent five year. Most of highly cited papers in last five years are extensions and applications of existing research, compared with top 20 cited papers in three decades. The theory of three-way decisions, motivated by rough set three-regions but goes beyond rough sets, is a promising research direction that may lead to new breakthrough.

17 Inspec Table: Number of papers published each year (Inspec) Year Papers Year Papers Year Papers N u m b e r o f P a p e rs P u b lic a tio n Y e a r J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 17/

18 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 18/22 IEEE Digital Library Table: Number of papers published each year (IEEE) Year Papers Year Papers N u m b e r o f P a p e rs P u b lic a tio n Y e a r

19 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 19/22 Developments of Rough sets 1 Rough set theory can be considered as an independent discipline. Probabilistic Rough Sets Decision-Theoretic Rough Sets Game-Theoretic Rough Sets Bayesian Rough Sets Information Theoretic Rough Set Approach Variable Precision Rough Sets Parameterized Rough Sets Dominance-based Rough Ret Approach 2 Generalized Rough Sets from three directions: binary relation based rough sets covering based rough sets subsystem based rough sets

20 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 20/22 Developments of Rough sets (continue) 3 Rough set theory has been combined with other theories, Fuzzy Sets Granular Computing The theoty of Three-way Decision Neural Network 4 Rough set applications, data analysis feature selection decision making (rules mining) incomplete information system multi-criteria decision analysis

21 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 21/22 Conclusion The analyses were conducted with other databases, IEEE Digital Library, Google scholar, and Inspec. The results more or less confirm with findings reported here. Rough sets has been in a state of constant development. Applying rough sets to different areas become more important. In order to broaden and deepen the study of rough sets, combining rough sets with other theories should be emphasized.

22 J. T. Yao & Y. Zhang A Scientometrics Study of Rough Sets in Three Decades 22/22 Questions?