Issue:Representation of null values with the aid of H-IFS

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Title of paper: Representation of null values with the aid of H-IFS Author(s): Panagiotis Chountas HSCS – University of Westminster, London, HA1 3TP, UK chountp@wmin.ac.uk Published in: "Notes on IFS", Volume 13 (2007) Number 1, pages 20—33 Download:  PDF (276  Kb, File info) Abstract: Here, we present a way to replace unknown values using background knowledge of data that is often available arising from a concept hierarchy, as integrity constraints, from database integration, or from knowledge possessed by domain experts. We present and examine the case of H-IFS to represent support contained in subsets of the domain as a candidate for replacing unknown values mostly referred in the literature as NULL values. Keywords: Null values, Intuitionistic fuzzy sets, Knowledge representation References: Bell, D., Guan, J., Lee, S.: Generalized union and project operations for pooling uncertain and imprecise information. DKE 18 (1996) 89-117 Chen, A., Tseng, F.: Evaluating aggregate operations over imprecise data. IEEE Trans. on Knowledge and Data Engineering, 8 (1996) 273-284 Zemankova, M., Kandel, A.: Implementing imprecision in Information systems. Inf. Sci. Vol. 37. (1985) 107–141 Dubois, D., Prade, H., Testamale, C.: Handling Incomplete or Uncertain Data and Vague Queries in Database Applications. Plenum Press (1988) Prade, H.: Annotated bibliography on fuzzy information processing. Readings on Fuzzy Sets in Intelligent Systems. Morgan Kaufmann Publishers Inc. (1993) Codd, E.: Extending the Data Base Relational Model to Capture More Meaning. ACM Trans. Database Systems, Vol.4, No.4, 397-434, 1979 Goldstein, B.: Constraints on Null Values in Relational Databases. Proc. 7th Int. Conf. on VLDB, IEEE Press (1981) 101-110 Biskup, J.: A Foundation of Codd's Relational Maybe-Operations. XP2 Workshop on Relational Database Theory. (1981) Liu, C., Sunderraman, R.: Indefinite and maybe information in relational databases. ACM Trans. Database Syst, Vol.15, No.1 (1990) 1–39. Liu, K., Sunderraman, R.: On Representing Indefinite and Maybe Information in Relational Databases: A Generalization. ICDE. IEEE Computer Society (1990) 495-502 Ola, A.: Relational databases with exclusive disjunctions. Data Engineering (1992) 328–336 Homenda, W.: Databases with Alternative Information. IEEE Trans. on Knowledge and Data Engineering, Vol. 3, No. 3. (1991) 384-386. Gessert, G.: Handling Missing Data by Using Stored Truth Values. SIGMOD Record, Vol. 20, No. 1 (1991) 30-42 Zicari, R.: Closed World Databases Opened Through Null Values. Proc. 14th Int. Conf. on VLDB. (1988) 50-61 Zaniolo, C.: Database relations with null values. J. Comput. Syst. Sci. Vol.28 (1984) 142–166. Lipski, J.: On semantic issues connected with incomplete information databases. ACM Trans. Database Syst, Vol.4, No.3 (1979) 262–296 Dhar, V., Tuzhilin, A.: Abstract-driven pattern discovery in databases. IEEE Trans. on Knowledge and Data Engineering 6 (1993) 926-938 Han, J., Fu, Y.: Attribute-oriented induction in data mining. Advances in Knowledge Discovery. AAAI Press/MIT Press, Cambridge, MA (1996) 399-421 Rogova E., Chountas P., Atanassov, K.: Flexible Hierarchies and Fuzzy Knowledge-based OLAP. FSKD 2007, Rogova E., Chountas P.: On imprecision intuitionistic fuzzy sets & OPLAP – The case for KNOLAP. IFSA 2007 Atanassov, K.: Intuitionistic Fuzzy Sets. Springer-Verlag. Heidelberg. (1999) Atanassov, K.: Intuitionistic fuzzy sets, Fuzzy Sets and Systems. (1986) 20, 87–96 Citations: The list of publications, citing this article may be empty or incomplete. If you can provide relevant data, please, write on the talk page.