Storm-time ionospheric disturbances monitored by GPS beacon measurements

Pei, Xiaohong; Yu, Shengbing; Xu, Jisheng; Ma, Shuang‐Gang

doi:10.1007/bf02830284

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Dai Shaosheng proposed a local adaptive DBSCAN clustering algorithm based on grid partition idea. According to the characteristics of the data set itself, the grid space is generated and the grid space is mapped, and then the Gaussian kernel function is used to estimate the local density of each grid interval to determine the key parameters of the algorithm, which has high clustering accuracy and low time-consuming [5].…”

Section: Research Statusmentioning

confidence: 99%

Illegal Sea Project Discovery Algorithm based on Hash Table and DBSCAN Algorithm

Cui,

Xu,

Zhang

et al. 2024

Proceedings of the First International Conference on Science, Engineering and Technology Practices for Sustainable Development,

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Marine cage culture does not need to be reclaimed, so it has a certain degree of conceal ability, which leads to the situation that some individuals or even enterprises install cages to carry out aquaculture in the open sea without approval. These behaviors not only violate the national legal system of marine natural resources management and cause pollution to the marine environment, but also have an inestimable impact on the safety of maritime shipping and marine tourism. The existing supervision methods, such as manual or simple density statistics of ships in the grid, have low work efficiency, huge labor cost and high misjudgment rate. In view of the above drawbacks, this paper proposes an illegal sea project detection algorithm based on hash table and DBSCAN algorithm. Through DBSCAN clustering analysis of spatial location and time in ais information, the clustering status of ships is separated. Further, hash table is used to calculate and save the relevant latitude and longitude distance data in advance to optimize the calculation time of DBSCAN algorithm. Finally, the spatial scope of the clustered coordinate points is judged, and the operating scope of ships in the open sea is distinguished, so as to narrow the key areas of government ships and drones, and improve the ability of maritime supervision.

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Section: Research Statusmentioning

confidence: 99%

Illegal Sea Project Discovery Algorithm based on Hash Table and DBSCAN Algorithm

Cui,

Xu,

Zhang

et al. 2024

Proceedings of the First International Conference on Science, Engineering and Technology Practices for Sustainable Development,

View full text Add to dashboard Cite

show abstract

“…Geomagnetic storms of different magnitudes (based on magnetic indices such Kp and Dst) have been observed to produce different effects on TEC at different latitudes. For example, Xiao-hong et al (2001) in the study of three great storms during April 2000 observed that while TEC responses at the middle and low-latitude were more apparent during local day than nighttime, the effects of storms on TEC were more dominant near the hump of the equatorial anomaly. At the Indian sector of the equatorial region, more than +68% and +72% deviations in VTEC were observed during the 15 May and 24 August, 2005 geomagnetic storms respectively (Amit et al, 2010).…”

Section: Introductionmentioning

confidence: 95%