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View usability and safety for the answering of top-k queries via materialized views

Eftychia Baikousi, Panos Vassiliadis
2009 Proceeding of the ACM twelfth international workshop on Data warehousing and OLAP - DOLAP '09  
In this paper, we investigate the problem of answering top-k queries via materialized views.  ...  We provide theoretical guarantees for the adequacy of a view to answer a top-k query, along with algorithmic techniques to compute the query via a view when this is possible.  ...  CONCLUSIONS In this paper, we have provided theoretical and algorithmic results for the problem of answering top-k queries via materialized views.  ... 
doi:10.1145/1651291.1651308 dblp:conf/dolap/BaikousiV09 fatcat:djeilmbnyfgypehpey6bpvhkcq

Provenance summaries for answers and non-answers

Seokki Lee, Bertram Ludäscher, Boris Glavic
2018 Proceedings of the VLDB Endowment  
Explaining why an answer is (not) in the result of a query has proven to be of immense importance for many applications.  ...  The resulting scalability and usability issues have limited the applicability of provenance.  ...  Opinions and findings expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. REFERENCES  ... 
doi:10.14778/3229863.3236233 fatcat:fxy3gujinbfc7jeun4gvafp7j4

Why? Why not? When? Visual Explanations of Agent Behavior in Reinforcement Learning [article]

Aditi Mishra, Utkarsh Soni, Jinbin Huang, Chris Bryan
2021 arXiv   pre-print
PolicyExplainer visualizes the states, policy, and expected future rewards for an agent, and supports asking and answering questions such as: Why take this action? Why not take this other action?  ...  PolicyExplainer is designed based upon a domain analysis with RL researchers, and is evaluated via qualitative and quantitative assessments on a trio of domains: taxi navigation, a stack bot domain, and  ...  We pick the top three nodes with the highest number of states, and for each of these nodes, compute the path P from the root to that node.  ... 
arXiv:2104.02818v2 fatcat:cvaxyrbpivfxvnu2ym5kyz7qp4

The LDL system prototype

D. Chimenti, R. Gamboa, R. Krishnamurthy, S. Naqvi, S. Tsur, C. Zaniolo
1990 IEEE Transactions on Knowledge and Data Engineering  
The paper further contains a description of the architecture and runtime environment of the system and the optimization techniques employed in order to improve the performance and assure the safety of  ...  This paper contains a comprehensive overview of the system and contains a description of the LDL language and the compilation techniques employed to translate LDL queries into target queries on the stored  ...  Acknowledgments The authors would like to recognize the contribution the following persons: Brijesh  ... 
doi:10.1109/69.50907 fatcat:7hdqgrvklzf4zb2lm6xkejdk4a

A logic-based approach to data integration [article]

J. Grant, J. Minker
2001 arXiv   pre-print
The process of transforming a query from the database relations to the resources is often referred to as query folding or answering queries using views, where the views are the resources.  ...  An important aspect of data integration involves answering queries using various resources rather than by accessing database relations.  ...  We also wish to thank Alon Levy who made several valuable suggestions which helped to improve the paper. We are also grateful to the referees for their many helpful comments and suggestions.  ... 
arXiv:cs/0110032v1 fatcat:yb5mryfrkreufiky63ghfeyldq

Virtual Knowledge Graphs: An Overview of Systems and Use Cases

Guohui Xiao, Linfang Ding, Benjamin Cogrel, Diego Calvanese
2019 Data Intelligence  
From a technological point of view, the main vendors of data integration tools [1] are integrating data using the standard relational † Corresponding author: Linfang Ding (  ...  In this paper, we present the virtual knowledge graph (VKG) paradigm for data integration and access, also known in the literature as Ontology-based Data Access.  ...  The key technology for query answering in the VKG approach is query reformulation, which avoids physically materializing from D the knowledge graph G P,D .  ... 
doi:10.1162/dint_a_00011 fatcat:dogtoffhbncx7lxxagytwlxz2u

JI.FI: Visual test and debug queries for hard real-time

Ethan Blanton, Demian Lessa, Puneet Arora, Lukasz Ziarek, Bharat Jayaraman
2013 Concurrency and Computation  
reporting query answers and rich visual context for their interpretation.  ...  A real-time aware temporal query processing engine able to answer temporal queries about the execution of the program. 4.  ...  For instance, the ThreadSchedules view is likely to be used across many queries and is thus a strong candidate for materialization.  ... 
doi:10.1002/cpe.3156 fatcat:gdcw25xf4fhbhhdpu6xdyljmcy


Ethan Blanton, Demian Lessa, Lukasz Ziarek, Bharat Jayaraman
2012 Proceedings of the 10th International Workshop on Java Technologies for Real-time and Embedded Systems - JTRES '12  
reporting query answers and rich visual context for their interpretation.  ...  A real-time aware temporal query processing engine able to answer temporal queries about the execution of the program. 4.  ...  For instance, the ThreadSchedules view is likely to be used across many queries and is thus a strong candidate for materialization.  ... 
doi:10.1145/2388936.2388962 dblp:conf/jtres/BlantonLZJ12 fatcat:ow7aaocmnzgebnydah3kqcn7gu

Polisis: Automated Analysis and Presentation of Privacy Policies Using Deep Learning [article]

Hamza Harkous, Kassem Fawaz, Rémi Lebret, Florian Schaub, Kang G. Shin, Karl Aberer
2018 arXiv   pre-print
We show that PriBot can produce a correct answer among its top-3 results for 82% of the test questions.  ...  Using an MTurk user study with 700 participants, we show that at least one of PriBot's top-3 answers is relevant to users for 89% of the test questions.  ...  Acknowledgements This research was partially funded by the Wisconsin Alumni Research Foundation and the US National Science Foundation under grant agreements CNS-1330596 and CNS-1646130.  ... 
arXiv:1802.02561v2 fatcat:klllbabgvncu5p3z77ko7yqp74

An interactive multimedia software house simulation for postgraduate software engineers

Helen Sharp, Pat Hall
2000 Proceedings of the 22nd international conference on Software engineering - ICSE '00  
One of our aims was to provide uniform project experience to all students, and at a distance we cannot expect all our tutors to offer exactly the same advice, answer queries in the same way, provide comparable  ...  This will allow the company to bid for projects with government organisations and to work with safety-related and safety-critical systems.  ... 
doi:10.1145/337180.337528 dblp:conf/icse/SharpH00 fatcat:dfxxyyilojhplgo5ogfktbgrp4

Towards a Semantically Enriched Local Dynamic Map

Thomas Eiter, Herbert Füreder, Fritz Kasslatter, Josiane Xavier Parreira, Patrik Schneider
2018 International Journal of Intelligent Transportation Systems Research  
We also sketch three application scenarios that illustrate the usability and benefits of our approach, thus we provide an in-depth validation of the scenarios in an experimental prototype.  ...  We introduce our envisioned architecture which includes an LDM ontology, an integration and annotation framework, and a stream query answering component.  ...  Acknowledgements We thank the reviewers for their comments, which helped to improve this article.  ... 
doi:10.1007/s13177-018-0154-x fatcat:v7memg7dcncyth63ry5x7bzu74

Design and Implementation of the LogicBlox System

Molham Aref, Balder ten Cate, Todd J. Green, Benny Kimelfeld, Dan Olteanu, Emir Pasalic, Todd L. Veldhuizen, Geoffrey Washburn
2015 Proceedings of the 2015 ACM SIGMOD International Conference on Management of Data - SIGMOD '15  
The LogicBlox system aims to reduce the complexity of software development for modern applications which enhance and automate decision-making and enable their users to evolve their capabilities via a "  ...  In this paper, we discuss the design considerations behind the LogicBlox system and give an overview of its implementation, highlighting innovative aspects.  ...  Datalog is highly declarative, and we believe it strikes the right balance between usability, expressive power, safety, and performance.  ... 
doi:10.1145/2723372.2742796 dblp:conf/sigmod/ArefCGKOPVW15 fatcat:rsqnraye3ncz7chrc6ofqwy7ii

Queries to Hybrid MKNF Knowledge Bases through Oracular Tabling [chapter]

José Júlio Alferes, Matthias Knorr, Terrance Swift
2009 Lecture Notes in Computer Science  
This procedure is able to answer conjunctive queries, and is parametric on an inference engine for reasoning in the ontology language.  ...  of the oracle compared to the complexity of the ontology language, maintains the data complexity of the well-founded semantics for hybrid MKNF knowledge bases.  ...  The restriction of conjunctive queries to DL-safety is not always necessary: for DLs like SHIQ conjunctive query answering is possible ( [7] ) and we may also make use of such existing algorithms, however  ... 
doi:10.1007/978-3-642-04930-9_1 fatcat:57lo7li3tvcwxbpwaxxqmmygte

Access control technologies for Big Data management systems: literature review and future trends

Pietro Colombo, Elena Ferrari
2019 Cybersecurity  
Data security and privacy issues are magnified by the volume, the variety, and the velocity of Big Data and by the lack, up to now, of a reference data model and related data manipulation languages.  ...  We then describe the state of the art and discuss open research issues.  ...  The authors declare that they have no competing interests. Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.  ... 
doi:10.1186/s42400-018-0020-9 fatcat:2wyaml2ffnfpjhof6faknr3wle

A very fast parallel object store for very fast applications

L. Böszörményi, K.H. Eder, C. Weich
1997 Simulation Practice and Theory  
An architecture for a memory-resident, Parallel and Persistent ObjectSTore (PPOST) is suggested. Different object-oriented databases might be built on top of PPOST.  ...  Such an architecture is especially advantageous for applications requiring very fast answers, such as CAD or high-performance simulation.  ...  Acknowledgments The authors thank J. Eder and M. Dobrovnik for many valuable suggestions.  ... 
doi:10.1016/s0928-4869(96)00024-9 fatcat:w4cvpu7l3na43mjl5tk7mudxcy
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