Results 61 to 70 of about 3,587 (160)
SGIR-Tree: Integrating R-Tree Spatial Indexing as Subgraphs in Graph Database Management Systems
ISPRS International Journal of Geo-InformationEfficient spatial query processing in Graph Database Management Systems (GDBMSs) has become increasingly important owing to the prevalence of spatial graph data.
Juyoung Kim +4 more
doaj +1 more source
MLRQ: an efficient labeling scheme for reachability queries on reduced DAGs
Journal of King Saud University: Computer and Information SciencesAnswering reachability queries is a fundamental operation in graph theory. Existing methods either build an index for partial reachability, which may lead to costly graph traversal during query processing, or construct an index for complete reachability,
Haiyan Zhang +2 more
doaj +1 more source
IEEE AccessThis paper presents a novel hybrid framework that combines Dynamic Spanning Tree Coverage (D-STC) with Q-learning to address the challenges of mobile robot navigation and coverage in dynamic environments. The proposed method enables efficient exploration
K. P. Jayalakshmi +2 more
doaj +1 more source
SB-Tree: A B+-Tree for In-Memory Time Series Databases With Segmented Block
IEEE AccessVarious devices such as smart cars, healthcare systems, and IoT platforms generate a massive amount of time series data. This type of data exhibits unique characteristics that pose new challenges for in-memory indexes, including heavy insert rates ...
Christine Euna Jung +4 more
doaj +1 more source
Analysis of Target Electromagnetic Scattering Characteristics Based on Accelerated SBR Algorithm
International Journal of Antennas and PropagationAiming at the inefficiency problem faced when analyzing the electromagnetic scattering characteristics of electrically large-sized targets, this paper, based on the existing bounding volume hierarchy (BVH) tree accelerated data structure commonly used in
Xuanji Wang, Nan Bi, Zhan Meng
doaj +1 more source
A Hybrid Path Planning Framework for Forest Mowing Using Two-Body-Inspired Orbital Control
ActuatorsAutonomous vegetation management in unstructured forest environments imposes a conflicting requirement: maximizing wide-area coverage while maintaining close-proximity safety around irregular obstacles.
Sun-Ho Jang +3 more
doaj +1 more source
Intrusion-resilient Signature Scheme Based on Complete Binary Tree
工程科学与技术, 2008 :Through periodically evolving key, intrusion resilient technique can powerfully defend the threat of key exposure.A new tree based intrusion resilient signature scheme (TBIRS) was proposed, and the correctness and security of TBIRS were testified.
doaj
MathematicsReversible data hiding in encrypted point clouds presents unique challenges due to their unstructured geometry, absence of mesh connectivity, and high sensitivity to spatial perturbations. In this paper, we propose an efficient and secure reversible data
Yuan-Yu Tsai +3 more
doaj +1 more source
Sensors, 2008 A procedure for both vertical canopy structure analysis and 3D single tree modelling based on Lidar point cloud is presented in this paper. The whole area of research is segmented into small study cells by a raster net.
Barbara Koch +2 more
doaj