Results 31 to 40 of about 6,889,955 (273)

Distribution of Time Interval between the Modifications of Result Sets Cardinalities in Random Databases

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2013
In this paper, we propose a method to estimate the probability distribution of the time interval which ellapses between the modifications of the cardinality in a random database query’s result set.
Velcescu Letitia
doaj   +1 more source

Dual deep modeling: multi-level modeling with dual potencies and its formalization in F-Logic

Journal of Software and Systems Modeling, 2016
An enterprise database contains a global, integrated, and consistent representation of a company’s data. Multi-level modeling facilitates the definition and maintenance of such an integrated conceptual data model in a dynamic environment of changing data
B. Neumayr, C. G. Schütz, Manfred Jeusfeld, M. Schrefl   +3 more
semanticscholar   +1 more source

Graphical Model Sketch

, 2016
Structured high-cardinality data arises in many domains, and poses a major challenge for both modeling and inference. Graphical models are a popular approach to modeling structured data but they are unsuitable for high-cardinality variables.
Bui, Hung, Ghavamzadeh, Mohammad, Kveton, Branislav, Muthukrishnan, S., Sun, Siqi, Theocharous, Georgios   +5 more
core   +1 more source

High-cardinality categorical covariates in network regressions

Japanese Journal of Statistics and Data Science
High-cardinality (nominal) categorical covariates are challenging in regression modeling, because they lead to high-dimensional models. For example, in generalized linear models (GLMs), categorical covariates can be implemented by dummy coding which ...
Ronald Richman, M. Wüthrich
semanticscholar   +1 more source

Forecasting the cost of processing multi-join queries via hashing for main-memory databases (Extended version)

, 2015
Database management systems (DBMSs) carefully optimize complex multi-join queries to avoid expensive disk I/O. As servers today feature tens or hundreds of gigabytes of RAM, a significant fraction of many analytic databases becomes memory-resident.
Ailamaki A., Boncz P. A., Boncz P. A., Chen M.-S., Chen M.-S., DeWitt D. J., Lang H., Li Y., Liu B., Lohman G. M., Lu H., Manegold S., Ono K., Schneider D. A., Shatdal A., Stillger M., Zhang N.   +16 more
core   +1 more source

Efficient AI-Driven Query Optimization in Large-Scale Databases: A Reinforcement Learning and Graph-Based Approach

Mathematics
As data-centric applications become increasingly complex, understanding effective query optimization in large-scale relational databases is crucial for managing this complexity.
Najla Sassi, Wassim Jaziri
doaj   +1 more source

Multi-Criteria Fuzzy Portfolio Optimization Considering Varying Levels of Investor Expectations [PDF]

تحقیقات مالی
ObjectiveThe objective of the present research is the optimization of investment portfolios, considering all significant criteria for investors in a fuzzy environment, and taking into account various levels of investor expectations for each criterion ...
Ali Namaki, Saeid Shirkavand, Amirsina Jirofti   +2 more
doaj   +1 more source

A Robust TCPHD Filter for Multi-Sensor Multitarget Tracking Based on a Gaussian–Student’s t-Mixture Model

Remote Sensing
To realize multitarget trajectory tracking under non-Gaussian heavy-tailed noise, we propose a Gaussian–Student t-mixture distribution-based trajectory cardinality probability hypothesis density filter (GSTM-TCPHD).
Shaoming Wei, Yingbin Lin, Jun Wang, Yajun Zeng, Fangrui Qu, Xuan Zhou, Zhuotong Lu   +6 more
doaj   +1 more source

Dimensional enrichment of statistical linked open data [PDF]

, 2016
On-Line Analytical Processing (OLAP) is a data analysis technique typically used for local and well-prepared data. However, initiatives like Open Data and Open Government bring new and publicly available data on the web that are to be analyzed in the ...
Bach Pedersen, Torben, Etcheverry, Lorena, Romero Moral, Óscar, Thomsen, Christian, Vaisman, Alejandro, Varga, Jovan   +5 more
core   +2 more sources

Relationship Between Neurologic Symptoms and Signs and FMR1 Genotype in Premutation Carriers

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background and Objectives Fragile X‐associated Tremor/Ataxia Syndrome (FXTAS) is the most severe late‐onset condition caused by a premutation in the FMR1 gene, characterized by expanded CGG triplet repeats of 55–200. Clinical presentations of FXTAS, including gait ataxia, kinetic tremor, cognitive decline, and rare Parkinsonism, are linked to ...
Flora Tassone, Freddy Chafota, Miguel E. Rentería, Randi J. Hagerman, Ellery Santos, Anna Atkinson, Nicholas G. Martin, Elsdon Storey, Danuta Z. Loesch   +8 more
wiley   +1 more source