Results 41 to 50 of about 247,233 (313)
A geospatial source selector for federated GeoSPARQL querying [version 2; peer review: 2 approved]
Open Research Europe, 2022 Background: Geospatial linked data brings into the scope of the Semantic Web and its technologies, a wealth of datasets that combine semantically-rich descriptions of resources with their geo-location.
Stasinos Konstantopoulos +2 more
doaj +1 more source
SPARQL2Flink: Evaluation of SPARQL Queries on Apache Flink
Applied Sciences, 2021 Existing SPARQL query engines and triple stores are continuously improved to handle more massive datasets. Several approaches have been developed in this context proposing the storage and querying of RDF data in a distributed fashion, mainly using the ...
Oscar Ceballos +4 more
doaj +1 more source
Efficient subspace skyline query based on user preference using MapReduce [PDF]
, 2015 Subspace skyline, as an important variant of skyline, has been widely applied for multiple-criteria decisions, business planning. With the development of mobile internet, subspace skyline query in mobile distributed environments has recently attracted ...
DONG Mianxiong +5 more
core +2 more sources
Distributed and Parallel Path Query Processing for Semantic Sensor Networks
International Journal of Distributed Sensor Networks, 2014 As the sensor networks are broadly used in diverse range of applications, Semantic Web technologies have been adopted as a means to manage the huge amount of heterogeneous sensor nodes and their observation data. Large amount of sensor data are annotated
Sung-Jae Jung +4 more
doaj +1 more source
Schema architecture and their relationships to transaction processing in distributed database systems [PDF]
, 1991 We discuss the different types of schema architectures which could be supported by distributed database systems, making a clear distinction between logical, physical, and federated distribution. We elaborate on the additional mapping information required
Apers, P.M.G., Scheuermann, P.
core +2 more sources
A Comparison of Distributed Spatial Data Management Systems for Processing Distance Join Queries [PDF]
, 2017 Due to the ubiquitous use of spatial data applications and the large amounts of spatial data that these applications generate, the processing of large-scale distance joins in distributed systems is becoming increasingly popular.
A Aji +8 more
core +1 more source
MapReduce Algorithm for Variants of Skyline Queries: Skyband and Dominating Queries
Algorithms, 2019 The skyline query and its variant queries are useful functions in the early stages of a knowledge-discovery processes. The skyline query and its variant queries select a set of important objects, which are better than other common objects in the dataset.
Md. Anisuzzaman Siddique +3 more
doaj +1 more source
A DFT-Based Running Time Prediction Algorithm for Web Queries
Future Internet, 2021 Web search engines are built from components capable of processing large amounts of user queries per second in a distributed way. Among them, the index service computes the top-k documents that best match each incoming query by means of a document ...
Oscar Rojas +2 more
doaj +1 more source
Pediatric Blood &Cancer, EarlyView.ABSTRACT Neuroblastoma is the most common extracranial solid tumor in early childhood. Its clinical behavior is highly variable, ranging from spontaneous regression to fatal outcome despite intensive treatment. The International Society of Pediatric Oncology Europe Neuroblastoma Group (SIOPEN) Radiology and Nuclear Medicine Specialty Committees ...
Annemieke Littooij +11 more
wiley +1 more source
Pediatric Blood &Cancer, EarlyView.ABSTRACT Introduction Adolescent siblings of children with cancer are at elevated risk for psychosocial problems. Unfortunately, various barriers such as limited family time and resources, conflicting schedules, and psychosocial staffing constraints at cancer centers hinder sibling access to support.
Christina M. Amaro +10 more
wiley +1 more source