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46,401
Uniform characterization of polynomialquery learnabilities
 In First International Conference, DS'98
, 1998
"... Abstract. We consider the exact learning in the query model. We deal with all types of queries introduced by Angluin: membership, equivalence, superset, subset, disjointness and exhaustiveness queries, and their weak (or restricted) versions where no counterexample is returned. For each of all possi ..."
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Cited by 4 (0 self)
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possible combinations of these queries, we uniformly give complete characterizations of boolean concept classes that are learnable using a polynomial number of polynomial sized queries. Our characterizations show the equivalence between the learnability of a concept class C using queries and the existence
Answering queries using views
 In PODS Conference
, 1995
"... We consider the problem of computing answers to queries by using materialized views. Aside from its potential in optimizing query evaluation, the problem also arises in applications such as Global Information Systems, Mobile Computing and maintaining physical data independence. We consider the probl ..."
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Cited by 448 (32 self)
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of deciding which literals from the original query can be deleted). We describe a polynomial time algorithm for nding rewritings, and show that under certain conditions, it will nd the minimal rewriting. Finally, we analyze the complexity of the problems when the queries and views may be disjunctive
Tractable reasoning and efficient query answering in description logics: The DLLite family
 J. OF AUTOMATED REASONING
, 2007
"... We propose a new family of Description Logics (DLs), called DLLite, specifically tailored to capture basic ontology languages, while keeping low complexity of reasoning. Reasoning here means not only computing subsumption between concepts, and checking satisfiability of the whole knowledge base, b ..."
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Cited by 495 (123 self)
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, but also answering complex queries (in particular, unions of conjunctive queries) over the instance level (ABox) of the DL knowledge base. We show that, for the DLs of the DLLite family, the usual DL reasoning tasks are polynomial in the size of the TBox, and query answering is LogSpace in the size
Relational Queries Computable in Polynomial Time
 Information and Control
, 1986
"... We characterize the polynomial time computable queries as those expressible in relational calculus plus a least fixed point operator and a total ordering on the universe. We also show that even without the ordering one application of fixed point suffices to express any query expressible with several ..."
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Cited by 318 (17 self)
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We characterize the polynomial time computable queries as those expressible in relational calculus plus a least fixed point operator and a total ordering on the universe. We also show that even without the ordering one application of fixed point suffices to express any query expressible
Constraint Query Languages
, 1992
"... We investigate the relationship between programming with constraints and database query languages. We show that efficient, declarative database programming can be combined with efficient constraint solving. The key intuition is that the generalization of a ground fact, or tuple, is a conjunction ..."
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Cited by 372 (43 self)
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of constraints over a small number of variables. We describe the basic Constraint Query Language design principles and illustrate them with four classes of constraints: real polynomial inequalities, dense linear order inequalities, equalities over an infinite domain, and boolean equalities. For the analysis
ModelDriven Data Acquisition in Sensor Networks
 IN VLDB
, 2004
"... Declarative queries are proving to be an attractive paradigm for interacting with networks of wireless sensors. The metaphor that "the sensornet is a database" is problematic, however, because sensors do not exhaustively represent the data in the real world. In order to map the raw sensor ..."
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Cited by 448 (36 self)
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Declarative queries are proving to be an attractive paradigm for interacting with networks of wireless sensors. The metaphor that "the sensornet is a database" is problematic, however, because sensors do not exhaustively represent the data in the real world. In order to map the raw sensor
High rate locallycorrectable and locallytestable codes with subpolynomial query complexity∗
, 2015
"... In this work, we construct the first locallycorrectable codes (LCCs), and locallytestable codes (LTCs) with constant rate, constant relative distance, and subpolynomial query complexity. Specifically, we show that there exist binary LCCs and LTCs with block length n, constant rate (which can eve ..."
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In this work, we construct the first locallycorrectable codes (LCCs), and locallytestable codes (LTCs) with constant rate, constant relative distance, and subpolynomial query complexity. Specifically, we show that there exist binary LCCs and LTCs with block length n, constant rate (which can
Highrate locallycorrectable and locallytestable codes with subpolynomial query complexity∗
, 2015
"... In this work, we construct the first locallycorrectable codes (LCCs), and locallytestable codes (LTCs) with constant rate, constant relative distance, and subpolynomial query complexity. Specifically, we show that there exist binary LCCs and LTCs with block length n, constant rate (which can eve ..."
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In this work, we construct the first locallycorrectable codes (LCCs), and locallytestable codes (LTCs) with constant rate, constant relative distance, and subpolynomial query complexity. Specifically, we show that there exist binary LCCs and LTCs with block length n, constant rate (which can
Efficient algorithms for processing XPath queries
 In VLDB
, 2002
"... Our experimental analysis of several popular XPath processors reveals a striking fact: Query evaluation in each of the systems requires time exponential in the size of queries in the worst case. We show that XPath can be processed much more efficiently, and propose mainmemory algorithms for this pr ..."
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Cited by 307 (23 self)
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for this problem with polynomialtime combined query evaluation complexity. Moreover, we present two fragments of XPath for which lineartime query processing algorithms exist. 1
Complexity of finding embeddings in a ktree
 SIAM JOURNAL OF DISCRETE MATHEMATICS
, 1987
"... A ktree is a graph that can be reduced to the kcomplete graph by a sequence of removals of a degree k vertex with completely connected neighbors. We address the problem of determining whether a graph is a partial graph of a ktree. This problem is motivated by the existence of polynomial time al ..."
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Cited by 386 (1 self)
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A ktree is a graph that can be reduced to the kcomplete graph by a sequence of removals of a degree k vertex with completely connected neighbors. We address the problem of determining whether a graph is a partial graph of a ktree. This problem is motivated by the existence of polynomial time
Results 1  10
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46,401