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Approximate reasoning by analogy to answer null queries

Soumitra Dutta
1991 International Journal of Approximate Reasoning  
In this paper, we develop the theoretical basis for the application of analogical reasoning to obtain approximate answers for null queries in the context of a fuzzy relational data model.  ...  Reasoning by analogy refers to recognizing certain similarities between a source situation / object and a target situation / object and deriving some properties of the target on the basis of observed similarities  ...  The help and support given by Prof. L. A. Zadeh and other members of the "fuzzy group" in the Computer Science Division at UC Berkeley is gratefully acknowledged.  ... 
doi:10.1016/0888-613x(91)90018-h fatcat:vlbpcu2kpnabbdqkibppj2dol4

Page 1605 of Mathematical Reviews Vol. , Issue 92c [page]

1992 Mathematical Reviews  
1605 92c:68178 68T27 03B52 Dutta, Soumitra Approximate reasoning by analogy to answer null queries. Internat. J. Approx. Reason. 5 (1991), no. 4, 373-398.  ...  In this paper, we develop the theoretical basis for the application of analogical reasoning to obtain approximate answers for null queries in the context of a fuzzy relational data model.  ... 

Accommodating imprecision in database systems

Amihai Motro
1990 SIGMOD record  
Most database systems are designed under assumptions of precision of both the data stored in their databases, and the requests to retrieve data.  ...  In reality, however, these assumptions are often invalid, and in recent years considerable attention has been given to issues of imprecision in database systems.  ...  Experimental database systems based on ideas similar to those described here have been implemented by various researchers. One example is the FR.DB system [14] .  ... 
doi:10.1145/122058.122066 fatcat:rrkyztt6xjd2tdfrsmoidqpi4m

Imprecision and Uncertainty in Database Systems [chapter]

Amihai Motro
1995 Fuzziness in Database Management Systems  
To uphold the integrity of a database in situations where knowledge of the real world is imperfect, one may either (1) restrict the model to that portion of the real world about which perfect information  ...  Databases are models of the real world. Yet, our knowledge of the real world is often imperfect, thus challenging our ability to create databases of integrity.  ...  The theory of possibility is based on fuzzy set theory.  ... 
doi:10.1007/978-3-7908-1897-0_1 fatcat:bv2gqgjtofghbo6iwhjaf2blnm

Representation and Access of Uncertain Relational Data

Arie Tzvieli
1989 IEEE Data Engineering Bulletin  
-Introduction There have been many attempts to introduce various kinds of flexibility in the handling of database queries (  ...  In this paper we are interested in both the handling of flexible requests and the management of data pervaded by imprecision, uncertainty or vagueness.  ...  ACKNOWLEDGMENT The implementation of FIIS was carried out by Suresh Rajgopal and Richard Roland. Acknowledgement: Thanks to Ami Motro for many suggestions which improved this presentation.  ... 
dblp:journals/debu/Tzvieli89 fatcat:zqhzab6apbf7lohhbvszrjyzzu

Distributed fuzzy case based reasoning

Santanu Chaudhury, Tuhina Singh, Partha S Goswami
2004 Applied Soft Computing  
This paper presents a framework for a distributed knowledge based system by integrating case based reasoning (CBR) and Fuzzy Logic.  ...  The framework for handling distributed case bases enables our system to construct solution based on collective experience distributed by discipline, time, and geography.  ...  for handling analogical relations.  ... 
doi:10.1016/j.asoc.2003.10.003 fatcat:zui5u3fag5gqfcdd6k2voiyvmm

The case for a wide-table approach to manage sparse relational data sets

Eric Chu, Jennifer Beckmann, Jeffrey Naughton
2007 Proceedings of the 2007 ACM SIGMOD international conference on Management of data - SIGMOD '07  
In particular, an RDBMS must 1) enable users to effectively build ad hoc queries over a very large number of attributes, and 2) support efficient evaluation of these queries over a wide, sparse table.  ...  A "sparse" data set typically has hundreds or even thousands of attributes, but most objects have non-null values for only a small number of these attributes.  ...  ACKNOWLEDGEMENT This work was funded by National Science Foundation Award SCI-0515491.  ... 
doi:10.1145/1247480.1247571 dblp:conf/sigmod/ChuBN07 fatcat:cz34idr3dra2djuypm6mkhgarm

Vague Sets or Intuitionistic Fuzzy Sets for Handling Vague Data: Which One Is Better? [chapter]

An Lu, Wilfred Ng
2005 Lecture Notes in Computer Science  
Fuzzy set theory has been proposed to handle such vagueness by generalizing the notion of membership in a set.  ...  A Vague Set (VS), as well as an Intuitionistic Fuzzy Set (IFS), is a further generalization of an FS. Instead of using point-based membership as in FSs, interval-based membership is used in a VS.  ...  Based on the above discussion, we use Fig. 5 to illustrate the relationships between various cases of nulls discussed so far.  ... 
doi:10.1007/11568322_26 fatcat:syfyow3cvfawvlqhvqkrdhvxkq

Querying a summary of database

W. A. Voglozin, G. Raschia, L. Ughetto, N. Mouaddib
2006 Journal of Intelligent Information Systems  
Moreover, this algorithm can be seen both as a boolean querying mechanism over a hierarchy of summaries, and as a flexible querying mechanism over the underlying relational tuples.  ...  The proposed search algorithm takes advantage of the hierarchical structure of the SAINTETIQ summaries to efficiently answer questions such as "how are, on some attributes, the tuples which have specific  ...  The reasons of a failure, that is the fuzzy labels in the query that cause the failure, may be displayed so that the user could ask a new query based on the previous one.  ... 
doi:10.1007/s10844-006-5451-1 fatcat:7tfr4mz4jfgzxml6api5np27pi

A Simple View of the Dempster-Shafer Theory of Evidence and its Implication for the Rule of Combination [chapter]

Lotfi A, Zadeh
1996 Advances in Fuzzy Systems — Applications and Theory  
evidential reasoning.  ...  The emergence of expert systems as one of the major areas of activity within AI has resulted in a rapid growth of interest within the AI community in issues relating to the management of uncertainty and  ...  Closer to AI, similar issues arise in the literature on cooperative responses to database queries (Joshi, 1982; Joshi & Webber, 1982; Kaplan, 1982) and the treatment of null values in relational models  ... 
doi:10.1142/9789814261302_0033 fatcat:bn7i3qe2wfaapovvgdnrkitgo4

Architecture of Future Data Base Systems

Michael Stonebraker
1990 IEEE Data Engineering Bulletin  
Query Optimization 5.  ...  databases in such a way that individual systems maintain their autonomy.  ...  Maria Zemankova, NSF Program Director of the Database and Expert Systems Program, recognized the substantial potential of this area and actively supported our efforts.  ... 
dblp:journals/debu/Stonebraker90 fatcat:wnywepen35fkjdvc4ac7oz5zoy

Top-down statistical estimation on a database

Neil C. Rowe
1983 Proceedings of the 1983 ACM SIGMOD international conference on Management of data - SIGMOD '83  
Rules can also be found by analogy.  ...  Cached answers may be saved over a session if users tend to concentrate on particular sets, kept at the end of a session for the next one. or pooled among a user group with similar interests.  ...  . * We can include reasoning about possible distinct values. e We can use graphics or linguistic hedges to capture fuzziness of query answers. * When sufficientlr, standardized, the database'abstract and  ... 
doi:10.1145/582216.582217 fatcat:elz5ksk7fvbe3ci2uktasconhu

Top-down statistical estimation on a database

Neil C. Rowe
1983 Proceedings of the 1983 ACM SIGMOD international conference on Management of data - SIGMOD '83  
Rules can also be found by analogy.  ...  Cached answers may be saved over a session if users tend to concentrate on particular sets, kept at the end of a session for the next one. or pooled among a user group with similar interests.  ...  . * We can include reasoning about possible distinct values. e We can use graphics or linguistic hedges to capture fuzziness of query answers. * When sufficientlr, standardized, the database'abstract and  ... 
doi:10.1145/582192.582217 dblp:conf/sigmod/Rowe83 fatcat:zzezcoy5cjem3ho4mzhvicevxe

Top-down statistical estimation on a database

Neil C. Rowe
1983 SIGMOD record  
Rules can also be found by analogy.  ...  Cached answers may be saved over a session if users tend to concentrate on particular sets, kept at the end of a session for the next one. or pooled among a user group with similar interests.  ...  . * We can include reasoning about possible distinct values. e We can use graphics or linguistic hedges to capture fuzziness of query answers. * When sufficientlr, standardized, the database'abstract and  ... 
doi:10.1145/971695.582217 fatcat:ymfnsavv5nbxvgbdychpfpsz7a

Supporting Probabilistic Data in Relational Databases

Sunil Prabhakar
2007 International VLDB workshop on Management of Uncertain Data  
The first talk Combining Tuple and Attribute Uncertainty in Probabilistic Databases by Lise Getoor from the University of Maryland, and the second talk Supporting Probabilistic Data in Relational Databases  ...  After the Twente Data Management workshop on Uncertainty in Databases held at the university of Twente in June 2006, the speakers and participants expressed their wish for a workshop on the same topic  ...  Because "exact" aggregation in uncertain databases can produce exponentially-sized results, we provide three alternatives: a low bound on the aggregate value, a high bound on the value, and the expected  ... 
dblp:conf/mud/Prabhakar07 fatcat:wkk4nzwbszck5aiynidfenvs5q
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