Results 71 to 80 of about 391,863 (191)
Efficient Spatial Keyword Search in Trajectory Databases
, 2012 An increasing amount of trajectory data is being annotated with text descriptions to better capture the semantics associated with locations. The fusion of spatial locations and text descriptions in trajectories engenders a new type of top-$k$ queries ...
Cong, Gao +4 more
core
Unbalanced Threshold Based Distributed Data Collection Scheme in Multisink Wireless Sensor Networks
International Journal of Distributed Sensor Networks, 2016 In multisink wireless sensor networks, synchronized data collection among multiple sinks is a significant and challenging task. In this paper, we propose an unbalanced threshold based distributed data collection scheme to reconstruct the synchronized ...
Guorui Li +3 more
doaj +1 more source
Any-k: Anytime Top-k Tree Pattern Retrieval in Labeled Graphs
, 2018 Many problems in areas as diverse as recommendation systems, social network analysis, semantic search, and distributed root cause analysis can be modeled as pattern search on labeled graphs (also called "heterogeneous information networks" or HINs ...
Ajwani, Deepak +5 more
core +1 more source
Indexing Reverse Top-k Queries
, 2012 We consider the recently introduced monochromatic reverse top-k queries which ask for, given a new tuple q and a dataset D, all possible top-k queries on D union {q} for which q is in the result. Towards this problem, we focus on designing indexes in two dimensions for repeated (or batch) querying, a novel but practical consideration.
Chester, Sean +3 more
openaire +2 more sources
Query Optimization in Distributed Database Based on Improved Artificial Bee Colony Algorithm
Applied SciencesQuery optimization is one of the key factors affecting the performance of database systems that aim to enact the query execution plan with minimum cost. Particularly in distributed database systems, due to the multiple copies of the data that are stored ...
Yan Du, Zhi Cai, Zhiming Ding
doaj +1 more source
Verifiable Top- Query Processing in Tiered Mobile Sensor Networks
International Journal of Distributed Sensor Networks, 2015 Verifiable top- k query processing in tiered sensor networks, which refers to verifying the authenticity and the completeness of top- k query results received by the network owner in tiered sensor networks, has received attention in very recent years ...
Fangju Liu +3 more
doaj +1 more source
Multi-PQTable for Approximate Nearest-Neighbor Search
Information, 2019 Image retrieval or content-based image retrieval (CBIR) can be transformed into the calculation of the distance between image feature vectors. The closer the vectors are, the higher the image similarity will be.
Xinpan Yuan +4 more
doaj +1 more source
Approximating Opaque Top-k Queries
Proceedings of the ACM on Management of DataCombining query answering and data science workloads has become prevalent. An important class of such workloads is top-k queries with a scoring function implemented as an opaque UDF - a black box whose internal structure and scores on the search domain are unavailable.
Jiwon Chang, Fatemeh Nargesian
openaire +2 more sources
Dynamic Top-$k$ Dominating Queries
, 2013 Let $\mathcal{S}$ be a dataset of $n$ 2-dimensional points. The top-$k$ dominating query aims to report the $k$ points that dominate the most points in $\mathcal{S}$. A point $p$ dominates a point $q$ iff all coordinates of $p$ are smaller than or equal to those of $q$ and at least one of them is strictly smaller.
Kosmatopoulos, Andreas, Tsichlas, Kostas
openaire +2 more sources
Continuous Top-k Contour Regions Querying in Sensor Networks
International Journal of Distributed Sensor Networks, 2013 Wireless sensor networks (WSNs) are important parts of Internet of Things or Cyber-Physical Systems (CPS). WSNs can be seen as a new type of distributed database systems. The data query processing is very important for WSNs.
Shangfeng Mo +4 more
doaj +1 more source